IPAC2017 - List of Keywords (quadrupole)

Paper	Title	Other Keywords	Page
MOPAB014	Generating Low Beta Regions With Quadrupoles for Final Muon Cooling	emittance, simulation, collider, betatron	107
	J.G. Acosta, L.M. Cremaldi, T.L. Hart, S.J. Oliveros, D.J. Summers UMiss, University, Mississippi, USA D.V. Neuffer Fermilab, Batavia, Illinois, USA
	Funding: Work supported by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359 Muon beams and colliders are rich sources of new physics, if muons can be cooled. A normalized rms transverse muon emittance of 280 microns has been achieved in simulation with short solenoids and a betatron function of 3 cm. Here we use ICOOL, G4beamline, and MAD-X to explore using a 400 MeV/c muon beam and strong focusing quadrupoles to approach a normalized transverse emittance of 100 microns and finish 6D muon cooling. The low beta regions produced by the quadrupoles are occupied by dense, low Z absorbers, such as lithium hydride or beryllium, that cool the beam. Equilibrium transverse emittance is linearly proportional to the beta function. Reverse emittance exchange with septa and/or wedges is then used to decrease transverse emittance from 100 to 25 microns at the expense of longitudinal emittance for a high energy lepton collider. Work remains to be done on chromaticity correction.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB014
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MOPAB041	Quadrupole Scan Measurements in the Beam Transport Line between DESY II and PETRA III	emittance, focusing, synchrotron, beam-transport	174
	J. Keil, H. Ehrlichmann, G.K. Sahoo, R. Wanzenberg DESY, Hamburg, Germany
	PETRA III is a 6 GeV third generation synchrotron light source in Hamburg, Germany. The storage ring is operated with a typical beam current of 100 mA and is running in top-up mode. The beam delivered to PETRA III is accelerated by a fast cycling booster synchrotron (DESY II), extracted in a 203 m long beam transport line (E-Weg) and injected afterwards into PETRA III. In the framework of PETRA IV upgrade scenarios the potential for decreasing the extracted emittance from DESY II has been investigated which can be achieved by lowering the extraction energy to 5 GeV and increasing the focusing in DESY II. In addition measuring the emittance of the extracted beam from DESY II and the optics in the beam transport line can help to better understand and improve the injection efficiency of PETRA III. By changing the quadrupole strength and measuring the beam size downstream on a screen monitor in the E-Weg the emittance of DESY II and the Twiss functions at the quadrupole in the E-Weg have been determined. Measurements at different energies and tunes of DESY II will be shown and compared with calculations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB041
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MOPAB046	Lattice Considerations for the Use of an X-Band Transverse Deflecting Structure (TDS) at SINBAD	dipole, lattice, cavity, electron	192
	D. Marx, R.W. Aßmann, U. Dorda, U. Dorda, B. Marchetti, F. Mayet DESY, Hamburg, Germany F. Mayet University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
	An X-band TDS is a well-known device for the characterization of the longitudinal properties of an electron bunch in a linear accelerator. It is planned that a novel X-band TDS with variable polarization* will be installed within the next few years at SINBAD, an upcoming accelerator R&D facility at DESY*. There are several measurements that can be performed with the TDS, each with specific optics requirements to reach the highest possible resolution and keep induced energy spread to a tolerable level. Quadrupoles will be installed between the TDS and the screen to help satisfy these conditions. In this paper, the requirements for the bunch length measurements, a novel 3D charge density reconstruction technique and slice energy measurements are discussed and some simulation results for the slice energy measurement using example lattices are presented. A. Grudiev, CLIC-note-1067 (2016). ** B. Marchetti et al. X-band TDS project contribution to these conference proceedings.
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MOPAB047	Electron Beam Phase Space Tomography at the European XFEL Injector	emittance, electron, FEL, optics	196
	M. Scholz, B. Beutner DESY, Hamburg, Germany
	The FEL process is determined by the 6D phase space distribution of relativistic electron bunches. Experimental reconstructions of these distributions are therefore a step foreward to understand the beam dynamics and to optimize FEL operation. The reconstructions of the transverse phase spaces can be acieved with tomographic methods. In the injector of the European XFEL, measurements for the reconstruction of the phase spaces were carried out using phase advance scans with multiple quadrupoles. The beam sizes were kept optimized at the measurement screen. A transversely deflecting cavity (TDS) was used to streak the beam vertically. That allows to do longitudinally slice resolved measurements of the horizontal phase space. The horizontal streak required for the slice measurements in the vertical plane was achieved with a correlated linear energy spread and dispersion. In this paper, we present measurement results showing longitudinal slice resolved reconstructions of the transverse phase spaces taken in the European XFEL injector.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB047
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MOPAB049	Development of a Focusing System for the AXSIS Project	linac, solenoid, plasma, focusing	203
	T. Vinatier, R.W. Aßmann, U. Dorda, B. Marchetti DESY, Hamburg, Germany
	In this paper, we investigate with ASTRA simulations the achievable performances for several focusing systems considered in the AXSIS project. We focus our attention on the requirements in terms of position of the focal point and bunch transverse size at this point. We show that they cannot be fulfilled with a solenoid resistive electro-magnet, but that it is possible when using a solenoid permanent magnet. The use of a quadrupole doublet proves to be adequate to fulfil the requirement on the position of the focal point and be very close to the one on the bunch transverse size, which could possibly be achieved by a further optimization of the parameters of the doublet. Finally, we also investigate the possibility to use an active plasma lens, showing that it could easily fulfil the requirements but that several points must be carefully studied before considering its implementation.
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MOPAB067	Response of Scintillating Screens to High Charge Density Electron Beam	electron, linac, diagnostics, experiment	268
	F. Miyahara, S. Kishimoto, M. Satoh, Y. Seimiya, T. Suwada KEK, Ibaraki, Japan M. Koshimizu Tohoku University, School of Science, Sendai, Japan
	Inorganic scintillating screens are very useful tool to measure transverse profile of charged particle beams. The cerium-doped yttrium:aluminum:garnet (YAG:Ce) crystal scintillator is used in many accelerating facilities. The scintillating screen shows good resolution comparable to that of OTR screen. However, response to high charge density electron beam, more than 10 nC per square millimeter, has not been clarified. In KEK e⁺/e⁻ injector linac, the charge areal density (σ) will exceed 25 nC per square mm. Thus, beam tests has been performed on YAG:Ce, LYSO, and BGO crystals for 1.5 GeV, 1 nC/bunch electron beam at the linac. Saturation of the luminescence which causes degradation of the resolution has been observed above 1 nC per square mm in those crystals. We will report the response of the scintillating screens to high charge density electron beam and discuss the degradation of the resolution due to the saturation of the light yield.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB067
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MOPAB068	Bunch Shape Monitor Development in J-PARC Linac	vacuum, electron, focusing, target	271
	A. Miura, J. Tamura JAEA/J-PARC, Tokai-mura, Japan Y. Liu KEK/JAEA, Ibaraki-Ken, Japan T. Miyao KEK, Ibaraki, Japan
	At Japan accelerator reserch complex (J-PARC), the linac, which serves as the injector for the downstream 3-GeV synchrotron, accelerates a negative-hydrogen-ion beam (H⁻) to obtain a 400-MeV beam energy. We use an accelerating frequency of 324 MHz for the accelerator cavities and of 972 MHz. Both the centroid-phase set point at the frequency jump from 324 MHz to 972 MHz and the phase-width control are key issues for suppressing the excess beam loss. In order to optimize a set point of the tuning cavities, we developed a bunch-shape monitor (BSM) to measure the phase width as well as a tuning strategy to minimize the beam loss. In the development of the BSM, the design developed in the INR, Russia. Because the BSM had first experienced to be used between accelearation cavities, we need to protect the leak-magnetic field from quadrupole magnets and outgas impacts to cavities. We installed a BSM again in the beamline, BSM started to measure the phase width and evaluated its performances with a peak-beam-current dependence. We proposed new strategy to use BSM-measurment data for the tuning cavity. This paper describes the BSM development, its modification, and new strategy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB068
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MOPAB069	Measurement of Transverse Multipole Moments of the Proton Beam in the J-PARC MR	multipole, proton, simulation, vacuum	274
	T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan A. Ichikawa, A. Minamino, K.G. Nakamura, Y. Nakanishi, T. Nakaya, W. Uno Kyoto University, Kyoto, Japan T. Koseki, H. Kuboki, M. Okada KEK, Tokai, Ibaraki, Japan
	Funding: This work was partially supported by MEXT/JSPS KAKENHI Grant Numbers 25105002 and 16H06288. Transverse multipole moments (quadrupole and more) of the beam may give important informations of the beam such as beam sizes, nonlinear resonances and so on. However higher moments are difficult to measure because signal-to-noise-ratio becomes smaller proportional to the n-th order of the beam-radius-to-vacuum-duct-radius ratio. In order to increase the SNR and to extend the multipole order, we developed and installed a 16 electrode beam monitor in the J-PARC MR, which consists of guard-potential-separated 16 striplines. The calibration method, beam test results will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB069
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MOPAB084	Online Measurement of Electrode Gains for Stripline Beam Position Monitor in the HLS II Storage Ring	storage-ring, site, radiation, operation	316
	F.F. Wu, L. Lin, X.Y. Liu, P. Lu, B.G. Sun, L.L. Tang, J.G. Wang, J.H. Wei, Y.L. Yang, T.Y. Zhou, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by the National Key Research and Development Program of China(No. 2016YFA0402000) and the National Science Foundation of China (11575181, 11605202) Three axially symmetric stripline beam position monitors were installed in the HLS II storage ring and each stripline BPM was machined with button BPM together. Due to mechanical errors of stripline BPM, differences in electrode gains will lead to measurement error for beam position and mutual coupling between beam horizontal position and vertical position. So it is very important to calibrate electrode gains for axially symmetric BPM. A method was proposed to calibrate electrode gains of this kind of BPM. This method is suitable for all axially symmetric BPMs, whether stripline BPM or button BPM. The online calibrated gains were compared with offline calibrated gains and the results have shown that online and offline calibrated electrode gains were basically consistent.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB084
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MOPAB085	Introduction of Beam Position Monitor System in the HLS II Storage Ring	storage-ring, closed-orbit, feedback, brilliance	319
	F.F. Wu, L. Lin, X.Y. Liu, P. Lu, B.G. Sun, L.L. Tang, J.G. Wang, J.H. Wei, K. Xuan, Y.L. Yang, T.Y. Zhou, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: Supported by the National Key Research and Development Program of China (No. 2016YFA0402000) Supported by the National Science Foundation of China (11575181, 11605202) Beam position monitor(BPM) system for the HLS II storage ring were designed in the HLS II upgrade project. This system is composed of BPM, BPM processor embedded with IOC and OPI. Every component of BPM system is introduced in this paper. BPM processors have different modes of data, such as ADC data, turn-by-turn(TBT) data, fast acquirement(FA) data and slow acquirement(SA) data. Different modes of data are used to different applications. Two applications based on SA data of the BPM system, such as BBA for quadrupole magnet center measurement and beam closed orbit feedback, are described in detail. The result of BBA shows that most magnetic centers of quadrupole magnets are in the range of [-1 mm, 1 mm] with respect to BPM electric centers. The result of beam closed orbit feedback shows that beam orbit stability when the closed orbit feedback system is on is far better than that when the closed orbit feedback system is off.
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MOPAB099	Design Study of Drift Tube Linac for BNCT Accelerator	DTL, simulation, rfq, linac	359
	Y. Lee, S.W. Jang, E.-S. Kim Korea University Sejong Campus, Sejong, Republic of Korea B.H. Choi IBS, Daejeon, Republic of Korea D.S. Kim Dawonsys, Siheung-City, Republic of Korea Z. Li SCU, Chengdu, People's Republic of China
	A-BNCT accelerator is being developed as a proton accelerator with a high beam current of 50 mA for effective cancer therapy. Drift tube linac (DTL) with the length of 4.5 m is composed of 1 tank and 48 drift tubes (DTs). Proton beam is accelerated from 3 MeV to 10 MeV. Electromagnetic quadrupoles (EMQs) are inserted into every DT for transverse focusing. Slug tuners and post couplers (PCs) are used for accelerating field stabilization and resonant frequency tuning, respectively. The beam dynamics and engineering design for the DTL are performed for effective beam acceleration, and the design results are in detail presented.
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MOPAB115	Transverse Beam Phase-Space Measurement Experience at CTF3	emittance, optics, collider, linear-collider	393
	D. Gamba, B. Constance, R. Corsini, S. Döbert, L. Malina, T. Persson, J. Roberts, A.P. Rollings, P.K. Skowroński, F. Tecker CERN, Geneva, Switzerland L. Martin JAI, Oxford, United Kingdom A.L. Peirson Serratosa Oxford University, Physics Department, Oxford, Oxon, United Kingdom
	One of the objective of the CLIC Test Facility (CTF3) at CERN is to demonstrate the CLIC Drive Beam Recombination concept. An accurate control of the transverse beam parameters is necessary in order to succeed in preserving the beam quality after the recombination. During the activity of the facility we improved our tools and technique for characterising the transverse phase space of the beam before and after recombination. The common quadrupole scan technique was improved by performing constant-beam-size measurement and it was enriched by a tomographic reconstruction of the phase-space. Moreover studies have been performed in order to estimate and subtract the impact of dispersion on such a measurements. An overview of these techniques will be presented with actual measurements performed over the last year of operations of the facility.
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MOPAB137	Validation of a Novel Emittance Diagnostic Method for Beams with Significant Space Charge	emittance, space-charge, focusing, simulation	451
	R.B. Fiorito, C.P. Welsch, H.D. Zhang Cockcroft Institute, Warrington, Cheshire, United Kingdom M.E. Conde, N.R. Neveu, J.F. Power ANL, Argonne, Illinois, USA O. Mete Apsimon Cockcroft Institute, Lancaster University, Lancaster, United Kingdom A.G. Shkvarunets UMD, College Park, Maryland, USA
	Funding: Work supported by the EU under grant agreement 624890, the STFC Cockcroft Institute Core Grant No. ST/G008248/1. Exact knowledge of beam emittance is of central importance for essentially every accelerator. However, there are only few methods to determine it when the beam has significant space charge. We report on our progress to validate a novel diagnostic method that has been proposed to determine the RMS emittance of an electron beam with space charge. This method uses RMS divergence and beam size data measured at a screen placed in a free drift region for selected values of magnetic focusing strength. A novel algorithm is then used to determine the cross correlation term and consequently the RMS emittance of the beam. Simulations, quadrupole scans, phase space tomography and optical diffraction-dielectric foil radiation interferometry are currently being employed to determine and compare the horizontal (x) and vertical (y) emittances of the 14 MeV witness electron beam at Argonne National Laboratory's Wakefield Accelerator. The results of simulations and current measurements are presented and the advantages of the new technique are discussed.
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MOPAB140	Phase-Space Analysis Using Tomography for the Muon g-2 Experiment at Fermilab	experiment, proton, target, storage-ring	462
	D. Stratakis Fermilab, Batavia, Illinois, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. In the next decade the Fermilab Muon Campus will host two world class experiments dedicated to the search for signals of new physics. The Muon g-2 experiment will determine with unprecedented precision the anomalous magnetic moment of the muon. The Mu2e experiment will improve by four orders of magnitude the sensitivity on the search for the as-yet unobserved Charged Lepton Flavor Violation process of a neutrinoless conversion of a muon to an electron. Maintaining and preserving a high density of particles in phase-space is an important requirement for both experiments. This paper presents a new experimental method for mapping the transverse phase space of a particle beam based on tomographic principles. We simulate our technique using the tracking code GEANT4, to ascertain accuracy of the reconstruction. Then we apply the technique to a series of proof-of-principle simulation tests to study injection, transport and extraction of muon and proton beams for the Fermilab g-2 and Mu2e Experiments.
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MOPAB150	Imaging the Spatial Modulation of a Relativistic Electron Beam	electron, experiment, scattering, emittance	480
	C. Zhang, W.S. Graves, L.E. Malin, J. Spence Arizona State University, Tempe, USA D.B. Cesar, J.M. Maxson, P. Musumeci, A. Urbanowicz UCLA, Los Angeles, USA C. Limborg, E.A. Nanni SLAC, Menlo Park, California, USA
	Funding: Work supported by NSF awards 1632780, 1415583, 1231306 and DOE award de-sc0009914 We describe Bragg diffraction of relativistic electron beams through a patterned Si crystal consisting of alternating thick and thin strips to produce nanometer scale electron density modulations. Multi-slice simulations show that a two-beam situation can be set up where, for a particular thickness of Si, nearly 100% of the electron beam is diffracted. Plans are underway to carry out experiments showing this effect in UCLA's ultrafast electron microscopy lab with 3.5 MeV electrons. We will select either the diffracted beam or the primary beam with a small aperture in the diffraction plane of a magnetic lens, and so record either the dark or bright field magnified image of the strips. Our first goal is to observe the nanopatterned beam at the image plane. We will then investigate various crystal thickness and sample orientations to maximize the contrast in the pattern and explore tuning the period of the modulation through varying magnification.
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MOPIK017	Simultaneous Generation of Drive and Witness Beam for Collinear Wakefield Acceleration	wakefield, acceleration, emittance, controls	535
	G. Ha POSTECH, Pohang, Kyungbuk, Republic of Korea M.E. Conde, D.S. Doran, W. Gai, J.G. Power ANL, Argonne, Illinois, USA
	Funding: This work is supported by Department of Energy, Office of High Energy Physics, under Contract No. DE-AC02-06CH11357. Generating the drive and witness bunch for collinear wakefield acceleration (CWFA) requires precise control of the longitudinal bunch shape for each bunch as well as the controlling their separation. The emittance exchange (EEX) beamline and a transverse mask can be used to achieve all of these requirements. First, this EEX-based method can independently control the longitudinal bunch shape of each bunches so that the drive bunch is shaped to generate a high transformer ratio while witness bunch is shaped to suppress its energy spread. Second, the timing jitter between the drive and witness bunch poses a serious limitation to the CWFA scheme but the EEX-based method eliminates this since both bunches are generated at the same time and share the exactly same beamline so there are no relative errors. In this paper, we confirm the feasibility of this EEX-based method for simultaneous generation with simulation for CWFA in a dielectric structure.
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MOPIK030	Design of a Beamline From a TR24 Cyclotron for Biological Tissues Irradiation	emittance, cyclotron, proton, dipole	564
	E. Bouquerel, T. Adam, G. Heitz, C. Maazouzi, C. Matthieu, M. Pellicioli, M. Rousseau, C. Ruescas, J. Schuler, E.K. Traykov IPHC, Strasbourg Cedex 2, France
	Funding: The PRECy project is supported by the Contrat de Projet Etat-Région (CPER) Alsace Champagne-Ardenne Lorraine. The PRECy project foresees the use of a 16-25 MeV energy proton beam produced by the recently installed TR24 cyclotron, CYRCé, at the Institut Pluridisciplinaire Hubert Curien (IPHC) of Strasbourg for biological tissues irradiation. One of the exit ports of the cyclotron will be used for this application along with a combination magnet. The platform will consist of up to 3 or 5 experimental stations linked to beamlines in a dedicated area next to the cyclotron vault. One of the beamlines will receive proton beams of a few cm diameter at intensities up to 100 nA. The status of the design of this first beam line is presented.
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MOPIK031	COSY Extraction Line Characterization and Modeling	extraction, optics, proton, storage-ring	567
	B. Lorentz, M. Bai, Y. Dutheil, R. Tölle, C. Weidemann FZJ, Jülich, Germany
	COSY is a versatile racetrack-type synchrotron accelerating protons and deuterons in a range of rigidity between 1 T m and 11 T m. Circulating beam can be slowly extracted on a third order resonance and channeled towards different users. New users of the COSY beam have presented new challenges with specific requests, most notably in term of beam shape. This in turn drove a strong interest to develop and improve characterization and modeling methods in the COSY extraction beam line. In this contribution we will present the different beam characterization methods used and their limitations. We will then discuss the modeling of the line and the importance of an accurate and reliable model of the extraction line. Some of the latest beam measurements are presented and compared to modeled results.
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MOPIK039	Transport Channel of Secondary Ion Beam of Experimental Setup for Selective Laser Ionization With Gas Cell Gals	ion, target, simulation, neutron	589
	N.Yu. Kazarinov, V. Bashevoy, G.G. Gulbekyan, I.A. Ivanenko, V.I. Kazacha, N.F. Osipov JINR, Dubna, Moscow Region, Russia S.G. Zemlyanoy JINR/FLNR, Moscow region, Russia
	GALS is the experimental setup intended for production and research of isobaric- and isotopically pure heavy neutron-rich nuclei. The beam line consists of two parts. The initial part is used for transport of the primary 136Xe ion beam with energy of 4.5-9.0 MeV/amu from the FLNR cyclotron U400M to the Pb target for the production of the studying ion beams. These beams have the following design parameters: the charge Z = +1, the mass A = 180-270 and the kinetic energy W = 40 keV. The second part placed after the target consists of SPIG (QPIG) system, the accelerating gap, the electrostatic Einzel lens, 90-degree spectrometric magnet (calculated value of the mass-resolution is equal to 1400) and the channel for the transportation of the ions from the focal plane of the magnet to a particle detector. The results of the simulation of particle dynamics and the basic parameters of the elements of the beam lines are presented in this report.
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MOPIK049	SPS Slow Extracted Spill Quality During the 2016 Run	target, extraction, power-supply, experiment	627
	V. Kain, J. Bauche, P. Catherine, K. Cornelis, M.A. Fraser, L. Gatignon, C.M. Genton, B. Goddard, K. Kahle, M. Magrans de Abril, O. Michels, L.S. Stoel, F.M. Velotti CERN, Geneva, Switzerland
	The flux of particles slow extracted with the 1/3 integer resonance from the Super Proton Synchrotron at CERN should ideally be constant over the length of the extraction plateau, for optimum use of the beam by the fixed target experiments. The extracted intensity is controlled in feed-forward correction of the horizontal tune via the main SPS quadrupoles. The Mains power supply noise at 50 Hz and harmonics is also corrected in feed-forward by small amplitude tune modulation at the respective frequencies with a dedicated additional quadrupole circuit. In 2016 the spill quality could be much improved with respect to the situation of the previous year with more performant algorithms. In this paper the improved tools are described and the characteristics of the SPS slow extracted spill in terms of macro structure and typical frequency content are shown. Other sources of perturbation were, however, also present in 2016 which frequently caused the spill quality to be much reduced. The different effects are discussed and possible or actual solutions detailed. Finally, the evolution of the spill quality during characteristic periods in the 2016 run is presented.
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MOPIK057	Strategy of Beam Tuning Implementation for the SARAF MEBT and SC Linac	linac, solenoid, focusing, simulation	652
	P.A.P. Nghiem, D. Uriot CEA/DSM/IRFU, France B. Dalena, J. Dumas, N. Pichoff CEA/IRFU, Gif-sur-Yvette, France
	Beam dynamics of the MEBT and Superconducting Linac in the SARAF accelerator are being finalized. A strategy for beam tuning implementation is applied to this section, leading to specifying the complete set of error tolerances / beam measurements / correctors. A systematic and precise methodology in several steps is applied, leading to fairly distributing the error budget, from which correction schemes are studied, allowing to determine the necessary beam measurements and correctors.
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MOPIK058	Beam Dynamic Studies for the SARAF MEBT and SC Linac	linac, cavity, rfq, simulation	655
	J. Dumas, N. Pichoff, D. Uriot CEA/IRFU, Gif-sur-Yvette, France P.A.P. Nghiem CEA/DSM/IRFU, France
	The SARAF MEBT and Super Conducting Linac (SCL) transport and accelerate deuterons or protons from the RFQ to the final energy. In this report, beam dynamics studies for this section are described. A rational distribution of the different roles of the MEBT leads to defining its necessary quadrupole/rebuncher composition. This allows easy beam re-tuning following changes from the RFQ or the SC Linac. After observing evidences of beam losses mainly due to phase unhooking, efforts have been dedicated to enlarge the SCL longitudinal acceptance. A combination of cavity field phases is found so that the required final beam energy is also fulfilled.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK058
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MOPIK060	Applying MOGA to Search Linear Lattice in Soleil Upgrade Project	lattice, emittance, sextupole, synchrotron	662
	H.C. Chao, P. Brunelle, R. Nagaoka SOLEIL, Gif-sur-Yvette, France
	In the community of synchrotron radiation facilities, multi-bend structure becomes the trend of the storage ring design toward lower emittance. For SOLEIL upgrade project, the 7BA-6BA hybrid structure is one of the current options. This paper puts the focus on the 7BA section. There are many degrees of freedom to tweak and many constraints to follow. Here, the idea is to search and build the linear lattice utilizing Multi-Objective Genetic Algorithm (MOGA), which is efficient dealing with higher dimension optimization problems. Within MOGA, subsidiary matchings are performed to ensure certain criteria when the new generation is bred. Delicate designs and manipulations of the objective functions are needed, in order to have a better convergence without being trapped in a local minimum. The results will be shown and discussed.
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MOPIK071	Dispersion and Beam Optic Parameter Measurements in the Transport Line (E-Weg) from DESY II to PETRA III	emittance, optics, injection, synchrotron	692
	G.K. Sahoo, K. Balewski, H. Ehrlichmann, J. Keil, R. Wanzenberg DESY, Hamburg, Germany
	The transport line E-Weg extends from the extraction septum in DESY II to the injection septum in PETRA III, and transports electrons at a beam energy of 6.0 GeV. It consists of 3 parts. The first part is in DESY tunnel, the second part is a long drift space in a slanted tube and the third part is in PETRA III tunnel. The vertical plane difference between the tunnels is 1.28 m. The optics was derived from initial values at Transfer Point (UGP) from a previous optics. The total length of the transfer line is about 203 m. Ten screen monitors are used to estimate the profiles of the beam spot for the optics measurements, while 8 BPMs, mostly adjacent to the screens, are used to compare and control the orbits. Two scrapers are installed on either side of the long drift space to trim the beam dimensions in transverse plane. Two FCTs are used to measure the beam current and transfer efficiency. The transverse dispersion and beta functions are measured by extracting the beam from DESY at different energies and analysing the beam profiles at the screen as well as positions at BPMs. The details of such measurements are reported in this paper.
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MOPIK073	Calibration of Linear Optics of COSY Based on ORM Data	factory, dipole, optics, sextupole	699
	C. Weidemann, M. Bai, Y. Dutheil, F. Hinder, B. Lorentz FZJ, Jülich, Germany
	The COoler SYnchrotron in Jülich is a well suited accelerator for a precursor experiment on the direct measurement of the Electric Dipole Moment (EDM) of the deuteron (see* and references within). It provides polarized and unpolarized proton and deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c, allows for phase space cooling and is highly flexible with respect to ion-optical settings. Unfortunately, a model independent linear optics measurement is not possible and so far the existing MAD-X model of COSY does not provide an agreement with the actual machine parameters that is required by future experiments, such as the EDM experiment. Significant deviations with respect to the working point and linear optics have been reported*. As shown in**, a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm in a C++ program was successfully developed and carefully benchmarked. This contribution presents the application of the new program on measured ORM data and its capabilities in calibrating linear optics as well as reconstructing machine imperfections such as gradient errors of quadrupole magnets and calibration factors of BPMs and steerers. D. Eversmann et al., PRL 115, no. 9, 094801 (2015). R. Maier, NIM A 390, 1 (1997). * C. Weidemann et al., PRSTAB 18, 020101 (2015). ** D. Ji et al., IPAC16, doi:10.18429/JACoW-IPAC2016-TUPMR026. *** C. Weidemann et al., IPAC16, doi:10.18429/JACoW-IPAC2016-THPMB009.
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MOPIK081	Study of HEPS Performance with Error Model and Simulated Correction	optics, sextupole, closed-orbit, simulation	721
	D. Ji, Z. Duan, S.K. Tian, Y. Wei IHEP, Beijing, People's Republic of China
	As an important component of physics study on High Energy Photon Source (HEPS), error modelling and simu-lated correction will provide the guideline to restrict the manufacture redundancy of the hardware and estimate the real machine performance. In this paper, we present some work on error effect evaluation and simulated commis-sioning based on a recent lattice design.
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MOPIK082	First Turn Around Strategy for HEPS	lattice, closed-orbit, accumulation, dipole	724
	Y.L. Zhao, Z. Duan, D. Ji, Y. Jiao, C. Li IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS) is a 6-GeV, kilometer-scale, quasi-diffraction limited storage ring light source to be built in China[1]. Getting the first turn and approaching the closed orbit is very important in accelerator commissioning. In order to make first turn beam commissioning efficiently, we develop a MATLAB tool based on AT for automatic beam correction and closed orbit searching. The algorithm and simulation results are presented in this paper.
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MOPIK087	Development of a Tune Knob for the HLS-II Storage Ring	storage-ring, lattice, sextupole, simulation	730
	S.W. Wang, J.Y. Li, W.B. Wu, W. Xu, K. Xuan, X. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	A tune knob is a useful tool for lattice setup and machine studies in a storage ring. It is used to adjust the transverse tunes with a small impact on the beam dynamics. A global tune knob is designed for the Hefei Light Source (HLS). In the tune knob, the quadrupoles are grouped into four families and are symmetrically adjusted. Methodical Accelerator Design-X (MAD-X) is used to calculate the coefficients of the tune knob and the Accelerator Toolbox (AT) is used to double check the accuracy of the tune knob. The chromaticity is corrected by the sextupoles in the storage ring. This paper reports preliminary simulation results of the tune knob for HLS. The beta function deviations are also studied.
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MOPIK088	Vertical Emittance Reduction in the SSRF Phase II Project	emittance, coupling, alignment, sextupole	733
	C.L. Li, B.C. Jiang, Z.B. Li, M.Z. Zhang, Q.L. Zhang, W.Z. Zhang SINAP, Shanghai, People's Republic of China
	The Shanghai Synchrotron Radiation Facility (SSRF) Phase II beamline project (SSRF Phase II) will implement the new lattice with dual-canted insertion devices, superbends and superconducting wiggler. The emittance coupling is one of the most important parameters for the high brightness storage ring light sources. It is often less than 1% in the third-generation storage ring light sources. In this paper, the sensitivity of emittance coupling to magnetic alignment errors in the SSRF Phase II is presented. Sixty skew quadrupole magnets are utilized to correct the emittance coupling with gradient descent algorithm. The emittance coupling obtained in the SSRF Phase II lattice is below 0.3%.
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MOPIK090	Beta Function Measurement in the SOLARIS Storage Ring	storage-ring, lattice, optics, sextupole	736
	A. Kisiel, M.B. Jaglarz, M.P. Kopeć, S. Piela, M.J. Stankiewicz, A.I. Wawrzyniak Solaris, Kraków, Poland
	One of the most essential lattice function used for transverse beam dynamics studies of the storage rings is a beta function. It characterizes the linear properties of magnets layout and allows to optimize the compatibility of the model and the machine by reducing the beta-beating. Moreover, the calculation of other parameters like transverse beam emittance, dynamic aperture, energy spread and others, requires knowledge of the quantity of beta function along the ring. Various methods of measurement of this function used in Solaris will be presented.
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MOPIK096	Predictability of the Beam Quality During RFQ Voltage Tuning	emittance, rfq, simulation, distributed	748
	A. Ponton ESS, Lund, Sweden A.C. France CEA/IRFU, Gif-sur-Yvette, France
	It has previously been demonstrated that certain spatial harmonics of the dipolar and quadrupolar components of the RFQ voltage have stronger effects on the beam quality than others. The study suggested that, during the tuning process to compensate for manufacturing errors, some harmonic contents (other than the first ones) should be minimized. The analysis presented in this paper looks at how we can predict the beam quality knowing the content of each voltage harmonics. We propose also a strategy to minimize the impacts of the voltage errors on the output beam phase space during the tuning phase. A. Ponton, A.C. France, Y.I. Levinsen, O. Piquet, B. Pottin, and E. Sargsyan, Voltage Error Studies in the ESS RFQ, in Proc. 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 2016, paper THPMB039, pp. 3320-3323, ISBN: 978-3-95450-147-2
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MOPIK097	Vertical Dispersion and Betatron Coupling Correction for FCC-ee	emittance, sextupole, coupling, collider	752
	S. Aumon, B.J. Holzer CERN, Geneva, Switzerland K. Oide KEK, Ibaraki, Japan
	The FCC-ee project foresees to build a 100 km e⁺/e⁻ circular collider for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm^-2s^-1. To reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2~mm at the IPs. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 1~nm for ε_x and 2~pm for ε_y, bringing down the coupling ratio to 2/1000. Thus, coupling and vertical dispersion sources have to be controlled carefully. This paper describes the tolerance of the machine to magnet alignment errors as well as the optics correction methods that were implemented, such as the Orbit Dispersion Free Steering, in order to bring the vertical dispersion to reasonable values. The correction of the betatron coupling, being also a very important source of emittance growth, has been integrated to a challenging correction scheme to keep the vertical emittance as low as possible.
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MOPIK100	Beam Delivery System Optimization for CLIC 380 GeV	luminosity, sextupole, lattice, optics	764
	F. Plassard, A. Latina, E. Marín, D. Schulte, R. Tomás CERN, Geneva, Switzerland P. Bambade LAL, Orsay, France
	In the framework of the CLIC rebaselining, the Beam Delivery System (BDS) have been re-optimized for its initial stage at 380 GeV. Two BDS designs with L=4.3 meters and L=6 meters have been investigated. The optimization of the lattices and the beam parameters at the interaction point (IP) have been performed by taking into account their energy upgrade to 3 TeV and the tuning feasibility of the BDS in presence of static imperfections.
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MOPIK102	Beam Dynamics Studies of the HIE-ISOLDE Transfer Lines in the Presence of Magnetic Stray Fields	experiment, shielding, operation, solenoid	768
	J. Mertens, J. Bauche, M.A. Fraser, B. Goddard, R. Ostojić, J.S. Schmidt CERN, Geneva, Switzerland
	The ISOLDE facility at CERN produces radioactive isotopes far from stability for fundamental nuclear physics research. The radioactive beams are accelerated to high-energy using a post-accelerator before being transferred for study in different experiments at the end of a network of High Energy Beam Transfer (HEBT) lines. In the framework of the HIE-ISOLDE project, the energy of post-accelerated beams is to be increased to over 10 MeV/u and new experimental detectors are being proposed for installation to exploit the new energy regime. The stray magnetic fields associated with many of the new detectors will distort the beam trajectories in the HEBT, potentially affecting the transmission of the low intensity beams delivered to the experiments. In this contribution, the influence on the HEBT of the stray field of the proposed ISOL Solenoidal Spectrometer is discussed, correction schemes described and shielding options assessed.
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MOPIK112	High Average Power Deuteron Beam Dynamics	neutron, target, emittance, diagnostics	798
	R.A. Marsh, G.G. Anderson, S.G. Anderson, D.L. Bleuel, M.L. Crank, P. Fitsos, D.J. Gibson, M. Hall, M.S. Johnson, B. Rusnak, J.D. Sain, R. Souza, A. Wiedrick LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 Lawrence Livermore National Lab (LLNL) is developing an intense, high-brightness fast neutron source to create sub-mm-scale resolution neutron radiographs and images. A pulsed 7MeV, 300μA average-current commercial deuteron accelerator will produce an intense source (10¹¹ n/s/sr at 0 deg) of fast neutrons (10MeV) using a novel neutron target with a small (1.5mm diameter) beam spot size to achieve high resolution. A highly flexible multi-accelerator beamline has been developed allowing for the use of both 4MeV and 7MeV RFQ/DTL deuteron accelerators. TRACE3D has been used to model the beam transport and design the quadrupole lattice and results will be presented including iterated design within beamline mechanical constraints, sensitivities, and multiple use of the magnets. Because of the high power density of such a tightly focused, modest-energy ion beam, intercepting beam diagnostics are extremely challenging, motivating novel concepts and extensions of current techniques to higher average power densities. Full duty factor beamline diagnostics will be discussed including charge, position, emittance via beam-induced fluorescence, and a full power beam dump and Faraday cup.
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MOPIK119	Beam Dynamics in g-2 Storage Ring	storage-ring, resonance, experiment, dipole	817
	W. Wu, B. Quinn UMiss, University, Mississippi, USA
	The muon anomalous magnetic moment has played an important role in constraining physics beyond the Standard Model. The Fermilab Muon g-2 Experiment has a goal to measure it to unprecedented precision: 0.14 ppm. To achieve this goal, we must understand the beam dynamics systematic effects in the muon storage ring. We will present the muon beam dynamics and discuss two specific topics here: the beam resonance which is related to the muon loss and the fast rotation analysis to determine the muon momentum distribution.
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MOPIK122	The Beam Optics of the FFAG Cell of the CBETA ERL Accelerator	electron, optics, dipole, focusing	820
	N. Tsoupas, J.S. Berg, S.J. Brooks, G.J. Mahler, F. Méot, V. Ptitsyn, D. Trbojevic BNL, Upton, Long Island, New York, USA J.A. Crittenden Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA S.C. Tygier UMAN, Manchester, United Kingdom
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The CBETA project[] is a prototype electron accelerator for the proposed eRHIC project[]. The electron accelerator is based on the Energy Recovery Linac (ERL) and the Fixed Field Alternating Gradient (FFAG) principles. The FFAG arcs and the straight section of the accelerator are comprised of one focusing and one defocusing quadrupoles which are designed as Halbach-type permanent dipole magnets with quadrupoles component[]. We will present the beam optics of the FFAG cell which is based on 3D field maps derived with the use of the OPERA computer code[*]. We will also present the electromagnetic design of the corrector magnets of the cell. http://arxiv.org/abs/1504.00588 http://arxiv.org/ftp/arxiv/papers/1409/1409.1633.pdf * K. Halbach, Nucl. Instrum. Meth. 169 (1980) pp. 1-10 **** http://www.scientificcomputing.com
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MOPIK123	Beam Dynamics Numerical Studies Regarding CBETA Cornell-BNL ERL	lattice, multipole, simulation, optics	824
	F. Méot, S.J. Brooks, D. Trbojevic, N. Tsoupas BNL, Upton, Long Island, New York, USA S.C. Tygier UMAN, Manchester, United Kingdom
	Funding: Work supported by New York State Energy Research and Development Authority (NYSERDA) The Cornell-BNL Electron Test Accelerator CBETA is based on a 36 MeV superconducting linac and on a single 4-pass up/4-pass down linear FFAG return loop, for beam acceleration from 6 to 150 MeV and energy recovery. Numerical beam dynamics simulations have accompanied and eventually validated the quadrupole-doublet FFAG cell technology and parameters, and following that the complete return loop, all along the ERL lattice design process. They are key to assessing and validating the ERL optics and beam behavior over the whole acceleration/ER cycle, and in preparing future machine operation. This paper presents various of these beam dynamics studies, including start-to-end simulations.
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MOPIK125	Multi-frequency AC LOCO: A Fast and Precise Technique for Lattice Correction	lattice, optics, power-supply, experiment	831
	X. Yang, K. Ha, V.V. Smaluk, Y. Tian, L. Yu BNL, Upton, Long Island, New York, USA
	We developed a novel technique to improve the precision and shorten the measurement time of the LOCO (Linear Optics from Closed Orbits) method at NSLS-II [1]. This technique named AC LOCO is based on a sine-wave (AC) beam excitation via fast correctors typically installed at synchrotron light sources for the fast orbit feedback. The beam oscillations are measured by beam position monitors. The narrow band used for the beam excitation and measurement not only allows us to suppress effectively the beam position noise and also makes simultaneously exciting multiple correctors at different frequencies (multi-frequency mode) possible. We demonstrated at NSLS-II that the new technique provides better lattice corrections and achieves two minutes measurement time in the thirty-frequency mode. [1] X. Yang et al., 'Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors', Phys. Rev. Accel. Beams, vol. 20, p. 054001, 2017.
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MOPVA034	A Compact EUV Light Source Using a mm-Wave Undulator	undulator, electron, gun, impedance	928
	F. Toufexis, V.A. Dolgashev, C. Limborg-Deprey, S.G. Tantawi SLAC, Menlo Park, California, USA
	Funding: This project was funded by U.S. Department of Energy under Contract No. DE-AC02-76SF00515, and the National Science Foundation under Contract No. PHY-1415437. We are building an Extreme Ultra Violet (EUV) light source based on a 1.75 mm period RF undulator. We will use a thermionic X-Band injector which utilizes RF bunch compression. The beam is accelerated using an X-Band traveling wave accelerating structure followed by a high shunt impedance standing wave accelerating structure up to 129 MeV. The beam then goes through a 91.392 GHz RF undulator with a period of 1.75 mm, producing EUV radiation around 13.5 nm. The RF undulator is powered by a 91.392 GHz decelerating structure, which extracts the RF power from the spent electron beam. The length of the entire beam line from the cathode to the beam dump is approximately 6 m. We describe the design and projected operating parameters for this EUV light source. F. Toufexis and S.G. Tantawi, A 1.75 mm Period RF-Driven Undulator, these proceedings.
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TUYA1	Linac4: From Initial Design to Final Commissioning	linac, proton, emittance, DTL	1217
	A.M. Lombardi CERN, Geneva, Switzerland
	This talk reviews the design, construction, and commissioning effort of CERN's new proton linear accelerator, Linac4, which has recently been commissioned and which is presently undergoing a reliability run. Linac4 will be connected to the LHC proton injector chain during the next long LHC shut down (LS2) and will then replace the ageing Linac2.
	Slides TUYA1 [30.159 MB]
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TUOBA1	Beam Commissioning Results of the CSNS Linac	DTL, linac, rfq, cavity	1223
	J. Peng, Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, S. Wang, S.Y. Xu, Y. Yuan IHEP, Beijing, People's Republic of China M.T. Li, Y.D. Liu CSNS, Guangdong Province, People's Republic of China
	The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW pro-ton beam to a solid metal target for neutron scattering research. It consists of a 50keV H⁻ Ion Source, a 3MeV Radio Frequency Quadrupole (RFQ), an 80MeV Drift Tube Linac (DTL), and a 1.6GeV Rapid-cycling Synchro-tron (RCS). The beam commissioning has been started since April 2015. The Front End and three of the four DTL tanks have been commissioned, while the last tank and the RCS will be commissioned at the autumn this year. At the end of the DTL3, beam has been accelerated to 61MeV with nearly 100% transmission, other parame-ters such as peak current, transverse emittance and beam orbit have reached the design goal. Results and status of the beam commissioning program will be presented. This work is supported by National Natural Science Foundation of China (11505101). *E-mail:pengjun@ihep.ac.cn
	Slides TUOBA1 [4.272 MB]
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TUZB2	Commissioning Status of High Luminosity Collider Rings for SuperKEKB	electron, solenoid, emittance, positron	1275
	H. Koiso KEK, Ibaraki, Japan
	SuperKEKB project aims to obtain the world's highest luminosity of 8x10³⁵/cm/s, in order to discover new particle physics beyond the Standard Model. Key technologies for the high luminosity are nano-beam scheme at the collision point and high positron and electron stored current with low emittance, which require the significant upgrade of both the injector and the collider rings. Recently commissioning of the renewal collider rings has been performed without final focus magnets and the Belle II detector (Phase 1). This talk gives results of the Phase 1 commissioning and construction status toward the first beam collisions (Phase 2).
	Slides TUZB2 [64.509 MB]
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TUOCB1	Progress in the Design of Beam Optics for FCC-ee Collider Ring*	collider, optics, sextupole, emittance	1281
	K. Oide, K. Ohmi KEK, Ibaraki, Japan M. Benedikt, H. Burkhardt, B.J. Holzer, A. Milanese, J. Wenninger, F. Zimmermann CERN, Geneva, Switzerland A.P. Blondel, M. Koratzinos DPNC, Genève, Switzerland A.V. Bogomyagkov, E.B. Levichev, D.N. Shatilov BINP SB RAS, Novosibirsk, Russia M. Boscolo INFN/LNF, Frascati (Roma), Italy
	The beam optics for the FCC-ee collider has been updated: (a) the layout is adjusted to a new footprint of FCC-hh, (b) the design around the interaction point is refined considering a number of machine-detecor interface issues, (c) the arc lattice is refined taking realistic magnet designs into account, (d) the β^* and betatron tunes are re-optimized according to recent results of the beam-beam simulations, and more. These changes make the collider design more realistic without performance degradation.
	Slides TUOCB1 [4.891 MB]
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TUPAB001	Proof of Concept of CLIC Final Focus Quadrupoles Stabilization	controls, simulation, collider, ground-motion	1290
	G. Balik, B. Aimard, L. Brunetti IN2P3-LAPP, Annecy-le-Vieux, France B. Caron SYMME, Annecy-le-Vieux, France
	The Compact LInear Collider (CLIC) [1] luminosity requires extremely low beam emittances. Therefore, high beam position stability is needed to provide cen-tral collisions of the opposing bunches. Since ground motion (GM) amplitudes are likely to be larger than the required tolerances, an Active Vibration Control (AVC) system is required to damp quadrupole motion to the desired value of 0.2 nm RMS at 4 Hz. This paper focuses on the vertical final focus quadrupoles (QD0, QF1) stabilization and demonstrates its feasibility. An AVC system to be installed under QD0 and QF1 has been developed and successfully tested at LAPP. Based on a dedicated homemade sensor with an ex-tremely low internal noise level of 0.05 nm at 4 Hz, it damps GM in the frequency range [3;70] Hz by up to 30 dB, leading to RMS values of approximately 0.25 nm at 4 Hz. Simulations based on GM measured in the Compact Muon Solenoid (CMS) experimental hall [2] show that with such a GM level, the specifications would only be achieved with a Passive Insulation (PI) system, which would filter ground motion starting at ~ 25 Hz
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TUPAB005	Investigation of Beam Variation and Emittance Growth Simulation With Both Misalignments and the Beam Jitter for SuperKEKB Injector Linac	emittance, linac, electron, simulation	1304
	Y. Seimiya, K. Furukawa, T. Higo, F. Miyahara, M. Satoh, T. Suwada KEK, Ibaraki, Japan
	Funding: This work was supported by JSPS KAKENHI Grant Number 16K17545. The SuperKEKB is e⁺/e⁻ circular collider for high luminosity, 8Â¥times10³⁵ as a target value. For the high luminosity, the injector linac is required to transport low emittance high-charged electron beam and positron beam to the ring. A charged beam with an offset from a center of cavity is affected by the wakefield depending on both the offset size in the cavity and longitudinal particle position in the beam. The wakefield causes emittance growth. This growth can be suppressed by appropriate orbit control so as to cancel the wakefield effect of the cavities in total. On the other hands, the beam variation in 6-dimensional phase space also induces the emittance growth. Emittance growth by both misalignments and 6-dimensional beam jitter was evaluated by particle tracking simulation. Investigation of beam jitter and drift was also performed by correlation analysis between beam position and measured parameter, charge or temperature.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB005
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TUPAB008	CEPC Linac Design and Beam Dynamics	positron, linac, electron, target	1315
	C. Meng, Y.L. Chi, X.P. Li, G. Pei, S. Pei, D. Wang, J.R. Zhang IHEP, Beijing, People's Republic of China
	Circular Electron-Positron Collider (CEPC) is a 100 km ring e⁺ e⁻ collider for a Higgs factory, which is organized and led by the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences (CAS) in collaboration with a number of institutions from various countries. The linac of CEPC is a normal con-ducting S-band linac with frequency in 2856.75 MHz and provide electron and positron beam at an energy up to 10 GeV with bunch charge in 1.0 nC and repetition frequency in 100 Hz. The linac scheme will be detailed discussed in this paper, including electron bunching system, positron source design, and main linac. Positrons are generated using a 4 GeV electron beam with bunch charge 10 nC hit tungsten target and the positron source design are presented. The beam dynamic results with longitudinal short Wakefield, transverse Wakefield and errors are presented.
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TUPAB018	Initial Data From an Electron Cloud Detector in a Quadrupole Magnet at CesrTA	electron, detector, positron, storage-ring	1352
	J.P. Sikora, S.T. Barrett, M.G. Billing, J.A. Crittenden, K.A. Jones, Y. Li, T.I. O'Connell Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: This work is supported by the US National Science Foundation PHY-0734867, PHY-1002467 and the US Department of Energy DE-FC02-08ER41538, DE-SC0006505 In September 2016, we installed a detector in a quadrupole magnet that measures the electron cloud density using two independent techniques. Stripline electrodes collect cloud electrons which pass through holes in the beam-pipe wall. The array of small holes shields the striplines from the beam-induced electromagnetic pulse. The beam-pipe chamber has also been designed so that microwave measurements of the electron cloud density can be performed. The resonant microwaves are confined to be within the 56 cm length of the quadrupole. The detector is placed in a newly installed quadrupole that is adjacent to an existing lattice quadrupole of the same polarity. Since they are powered independently, their relative strengths can be varied with stored beam – allowing electron cloud measurements to be made as a function of gradient. This paper presents the first data obtained with this detector with trains of positron bunches at 5.3 GeV. The detector is installed in the Cornell Electron Storage Ring and is part of the test accelerator program for the study of electron cloud build-up using electron and positron beams from 2 to 5 GeV.
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TUPAB063	High Energy Transport Line Design for the HEPS Project	injection, booster, storage-ring, extraction	1466
	Y.Y. Guo, Z. Duan, Y. Jiao, Y.M. Peng, G. Xu IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS), a kilometer-scale storage ring light source with the energy of 6GeV is to be built in China. For the injection scheme of the stor-age ring, on-axis injection is the baseline scheme. To simultaneously accommodate on-axis accumulation and swap-out injection schemes, we designed two high energy transport lines. In this paper we will report the detailed design of these two transport lines, including the layout and lattice design.
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TUPAB075	Compact High Energy Electron Radiography System Based on Permanent Magnet Quadrupole	electron, target, experiment, permanent-magnet	1494
	Z. Zhou, Y.-C. Du, W. Gai, W.-H. Huang, F. Li, T. Rui, C.-X. Tang TUB, Beijing, People's Republic of China W. Gai ANL, Argonne, Illinois, USA
	High energy electron radiography(HEER) is a promising diagnostic method for High Energy Density Physics (HEDP) or Inertial Confinement Fusion (ICF) owing to its capability of picosecond-nanometer spatio-temporal resolution, and is cost-effective in the meantime. A Compact HEER (CHEER) system based on Permanent Magnet Quadrupoles (PMQ) instead of conventional electromagnetic quadrupole is proposed. Its lattice design and beam optics optimization is finished, and experiment is to be carried out on Tsinghua Thomson X-ray source (TTX) beamline after PMQs fabrication and installation.
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TUPAB084	Beam Stability Modeling and Jitter Control for SXFEL Linac	linac, FEL, controls, klystron	1513
	M. Zhang, R.B. Deng, D. Gu, Q. Gu, D. Huang, Z. Wang SINAP, Shanghai, People's Republic of China
	FEL operations foresee stringent requirements for the stability of the global linac output parameters and this requirement is particularly stringent for the successful operation of an externally seeded FEL. In order to understand the sensitivity of these parameters to jitters of various error sources along the SXFEL linac, studies have been performed based on analytical methods and tracking code simulations. Using the tolerance budget as guidance, beam jitter control techniques are discussed on the view of the beam dynamics.
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TUPAB094	Emittance Improvements in the MAX IV Photocathode Injector	emittance, linac, gun, laser	1533
	J. Andersson, F. Curbis, M. Kotur, F. Lindau, S. Thorin, S. Werin MAX IV Laboratory, Lund University, Lund, Sweden
	The MAX IV injector design predicts a beam with 100 pC of charge and an emittance lower than 1 mm mrad. The photocathode pre-injector is based on the now close to standard 1.6-cell gun adapted to 2.9985 GHz, in combination with a Ti:Sapphire laser system. This system reaches the requirements of the injector operation for the SPF, but can be tuned beyond specifications to open up new operation modes. During 2016 and 2017 several aspects where investigated to improve the emittance from the current gun, the goal was to meet the SPF specifications. In this paper we report on the progress, discuss the steps taken leading to a final emittance of ~ 1 mm mrad and beyond.
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TUPAB133	Perturbation Analysis for Beam Trajectories. Determining Local Shielding Containment for LCLS-II	shielding, simulation, dipole, undulator	1637
	M. Santana-Leitner SLAC, Menlo Park, California, USA
	Funding: Work supported by U.S. Department of Energy contract DE-AC02-76SF00515 Containment of beam losses by halo and momentum/energy collimators is a well-established practice for normal operation of particle accelerators where tracking codes are applied. However, for exceptional events, such as magnet power failures, severe lattice mis-match, etc., ad-hoc analytical approaches are typically applied. Oftentimes those simplified methods are not automatic; they don't define the full phase-space of mis-steered trajectories and cannot keep up with beam-line upgrades. Moreover, there may exist a disconnect between the teams analyzing consequences of errant beams and those involved in beam-line design. With electron beams exceeding 100 kW, design of LCLS-II at SLAC National Accelerator Laboratory required exhaustive beam-containment studies to avoid potential destruction of components and excessive dose rates. The geometry of the different beam-lines and the nominal optics was built with MadFLUKA [1], and FLUKA [2] Monte Carlo code along with perturbations to magnetic fields was used to inspect failures compatible with beam operations and hardware settings. Consequences of mis-steered rays and the respective mitigations were directly analyzed with FLUKA. [1] M. Santana-Leitner et al., MadFLUKA Beam Line 3D Builder. Simulation of Beam Loss Propagation in Accelerators, IPAC14 proceedings, MOPME040 [2] A. Ferrari et al, The FLUKA Code: Developments and Challenges for High Energy and Medical Applications, Nuclear Data Sheets 120, 211-214 (2014)
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TUPIK014	Detailed Analysis of a Linear Beam Transport Line from a Laser Wakefield Accelerator to a Transverse-Gradient Undulator	multipole, beam-transport, alignment, simulation	1711
	A. Will, A. Bernhard, A.-S. Müller, C. Widmann KIT, Karlsruhe, Germany M. Kaluza HIJ, Jena, Germany M. Kaluza IOQ, Jena, Germany
	A linear beam transport system, experimentally tested at the Laser Wakefield Accelerator in Jena, Germany, has been carefully analyzed in order to gain a deeper understanding of the experimental results and to develop experimental strategies for the future. This analysis encompassed a detailed characterization of the focusing magnets and an investigation of the effects of source parameters as well as magnet and alignment errors on the observables accessible in the experiment. A dedicated tracking tool was developed for these investigations. In this contribution we review the main results of these studies.
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TUPIK037	Proton Cross-Talk and Losses in the Dispersion Suppressor Regions at the FCC-hh	proton, simulation, collimation, luminosity	1763
	H. Rafique, R.B. Appleby UMAN, Manchester, United Kingdom J.L. Abelleira JAI, Oxford, United Kingdom A.M. Krainer, A. Langner CERN, Geneva, Switzerland
	Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol), EU's Horizon 2020 grant No 654305 Protons that collide at the interaction points of the FCC-hh may contribute to the background in the subsequent detector. Due to the high luminosity of the proton beams this may be of concern. Using DPMJET-III to model 50 TeV proton-proton collisions, tracking studies have been performed with PTC and MERLIN in order to gauge the elastic and inelastic proton cross-talk. High arc losses, particularly in the dispersion suppressor regions, have been revealed. These losses originate mainly from particles with a momentum deviation, either from interaction with a primary collimator in the betatron cleaning insertion, or from the proton-proton collisions. This issue can be mitigated by introducing additional collimators in the dispersion suppressor region. The specific design, lattice integration, and the effect of these collimators on cross-talk is assessed.
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TUPIK077	Main Achievements of the PACMAN Project for the Alignment at Micrometric Scale of Accelerator Components	alignment, target, collider, feedback	1872
	H. Mainaud Durand, K. Artoos, M.C.L. Buzio, D. Caiazza, N. Catalán Lasheras, A. Cherif, I.P. Doytchinov, J.-F. Fuchs, A. Gaddi, N. Galindo Munoz, J. Gayde, S.W. Kamugasa, M. Modena, P. Novotny, S. Russenschuck, C. Sanz, G. Severino, D. Tshilumba, V. Vlachakis, M. Wendt, S. Zorzetti CERN, Geneva, Switzerland A. Faus-Golfe LAL, Orsay, France
	Funding: The research leading to these results has received funding from the European Union's 7th Framework Programme Marie Curie actions, grant agreement PITN-GA-2013-606839. The objectives of the PACMAN* project are to improve the precision and accuracy of the alignment of accelerator components. Two steps of alignment are concerned: the fiducialisation, i.e. the determination of the reference axis of components w.r.t alignment targets, and the initial alignment of components on a common support assembly. The main accelerator components considered for the study are quadrupoles, 15 GHz BPM and RF structures from the Compact LInear Collider (CLIC) project. Different methods have been developed to determine the reference axis of these components with a micrometric accuracy, as well as to determine the position of this reference axis in the coordinate frame of the common support assembly. The tools and methods developed have been validated with success on dedicated test setups using CLIC components. This paper will provide a compilation of the main achievements and results obtained. * PACMAN is an acronym for a study on Particle Accelerator Components' Metrology and Alignment to the Nanometre scale.
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TUPIK085	HL-LHC Alignment Requirements and Associated Solutions	alignment, target, vacuum, monitoring	1893
	H. Mainaud Durand, S. Bartolome-Jimenez, T. Dijoud, A. Herty, M. Sosin CERN, Geneva, Switzerland M. Duquenne, V. Rude ESGT-CNAM, Le Mans, France
	To increase by more than 10 times the luminosity reach w.r.t the first 10 years of the LHC lifetime, the HL-LHC project will replace nearly 1.2 km of the accelerator during the Long Shutdown 3 scheduled in 2024 [1][2][3]. This paper presents the HL-LHC alignment and internal metrology requirements of all the new components to be installed, from the magnet components to the beam instrumentation and vacuum devices. As for the LHC, a combination of Hydrostatic Levelling Sensors (HLS) and Wire Positioning Sensors (WPS) is proposed for the alignment of the main components, but on a longer distance (210 m instead of 50 m), generating technical challenges for the installation of the stretched wire and for the maintenance of the alignment systems. Innovative measurements methods and instrumentation are under study to perform the position monitoring inside a cryostat of cold masses and crab cavities, in a cold (2K) and radioactive (1 MGy/year) environment, as well as to carry remote measurements in the tunnel of the intermediary components. The proposed solutions concerning the determination of the position and the re-adjustment of the components are detailed in this paper.
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TUPIK087	Phase Advance Interlocking Throughout the Whole LHC Cycle	optics, kicker, software, operation	1901
	K. Fuchsberger, A. Calia, M.A. Galilée, G.H. Hemelsoet, M. Hostettler, D. Jacquet, J. Makai, M. Schaumann CERN, Geneva, Switzerland
	Each beam of CERN's Large Hadron Collider (LHC) stores 360 MJ at design energy and design intensity. In the unlikely event of an asynchronous beam dump, not all particles would be extracted immediately. They would still take one turn around the ring, oscillating with potentially high amplitudes. In case the beam would hit one of the experimental detectors or the collimators close to the interaction points, severe damage could occur. In order to minimize the risk during such a scenario, a new interlock system was put in place in 2016. This system guarantees a phase advance of zero degrees (within tolerances) between the extraction kicker and the interaction point. This contribution describes the motivation for this new system as well as the technical implementation and the strategies used to derive appropriate tolerances to allow sufficient protection without risking false beam dump triggers.
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TUPIK097	Improving the Performance of an Orbit Feed-forward Based on Quadrupole Motion at the KEK ATF	kicker, feedback, ground-motion, collider	1931
	D.R. Bett, C. Charrondière, M. Patecki, J. Pfingstner, D. Schulte, R. Tomás CERN, Geneva, Switzerland P. Burrows, G.B. Christian, C. Perry JAI, Oxford, United Kingdom A. Jeremie IN2P3-LAPP, Annecy-le-Vieux, France K. Kubo, S. Kuroda, T. Naito, T. Okugi, T.T. Tauchi, N. Terunuma KEK, Ibaraki, Japan
	The high luminosity requirement for a future linear collider sets a demanding limit on the beam quality at the Interation Point (IP). Even the natural motion of the ground could misalign the quadrupole magnets to such an extent that the resulting dipole kicks would require compensation. The novel technique described in this paper uses seismometers to measure the positions of the quadrupole magnets in real time and a kicker to counteract the effect of their misalignment. The prototype system deployed at the Accelerator Test Facility (ATF) at KEK in Japan has already demonstrated a reduction in the pulse-to-pulse vertical position jitter of the beam by about 10%. Based on the observed correlation of the beam position to the quadrupole positions the maximum possible jitter reduction from such a system is estimated to be about 25%. This paper details the latest improvements made to the system with the aim of achieving this limit.
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TUPIK099	Beam-Based Alignment for the Rebaselining of CLIC RTML	emittance, sextupole, coupling, alignment	1939
	Y. Han, L. Ma SDU, Shandong, People's Republic of China A. Latina, D. Schulte CERN, Geneva, Switzerland
	The first stage of the CLIC is proposed to be at 380 GeV. So the Ring To Main Linac (RTML), which transport the beams from the damping ring to main linac with minimal emittance growth, should be restudied due to the new beam properties. In this paper the two bunch compressors in the RTML are redesigned. Then a complete study of the static beam-based alignment techniques along RTML is presented. The beam-based correction includes one-to-one and dispersion-free steering, then a global correction using tuning bumps is applied to reduce the final emittance and mitigate the effects of coupling. The results showed that the emittance growth budgets can be met both in the horizontal and vertical planes.
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TUPIK100	Methodology Applied for Dependability Studies on the Compact Linear Collider	simulation, operation, linac, collider	1943
	O. Rey Orozko, A. Apollonio, M. Jonker CERN, Geneva, Switzerland
	The Compact Linear Collider (CLIC) scheme presents several challenges in terms of reliability and availability. The goal of the study is to demonstrate the requirements for availability and reliability by identifying the key factors on failure effects and analysing possible operational scenarios and designs. Hence, a good knowledge on CLIC system structures, failure modes and failure effects is needed. This paper reports about the set-up of the studies from the definition of the CLIC failure catalogue to the implementation of the models and analysis of the results. It will present in detail the steps that need to be followed when performing such a study. Finally, the CLIC Drive Beam Quadrupoles powering system will be presented as a use-case.
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TUPIK108	Beam Based Alignment Studies for the CLARA FEL Test Facility	FEL, alignment, undulator, cavity	1971
	J.K. Jones, N. Thompson STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	The CLARA (Compact Linear Accelerator for Research and Applications) test facility is designed to experimentally demonstrate innovative FEL schemes for future light source applications. Such schemes can place strict requirements on the accelerator beam properties as well as the relative alignment of the beam in the FEL radiators and modulators. Beam-based alignment (BBA) of the FEL section is therefore an operational requirement for all advanced FEL facilities. In this paper we demonstrate results of CLARA BBA simulations, and also report initial simulation results from the use of non-linear algorithms to optimise the FEL performance directly.
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TUPIK130	A Permanent Magnet Quadrupole Magnet for CBETA	permanent-magnet, dipole, lattice, electron	2016
	H. Witte, J.S. Berg, J. Cintorino, G.J. Mahler, N. Tsoupas, P. Wanderer BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Recently a collaboration between Brookhaven National Laboratory and Cornell University was established, aiming to build the CBETA accelerator. CBETA is a 150 MeV electron test accelerator, which prototypes essential technologies of eRHIC, which is a proposed upgrade to the existing Relativistic Heavy Ion Collider (RHIC) hadron facility at Brookhaven National Laboratory. Similar to eRHIC, CBETA employs an FFAG lattice for the arcs. The arcs require short, large aperture quadrupole magnets, which are located close together. BNL has been working on a design employing permanent magnets; we show the concept and the engineering design of these magnets. Prototype magnets have been constructed recently; we report on magnetic field quality measurements and their agreement with computer simulations.
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TUPVA001	Progress on the Optics Corrections of FCC-hh	dipole, injection, coupling, lattice	2019
	D. Boutin, A. Chancé, B. Dalena CEA/IRFU, Gif-sur-Yvette, France B.J. Holzer, D. Schulte CERN, Geneva, Switzerland
	The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the three options considered for the next generation accelerator in high-energy physics as recommended by the European Strategy Group, and the natural evolution of existing LHC. Studies are ongoing about the evaluation of the various magnets mechanical errors and field errors tolerances in the arc sections of FCC-hh, as well as an estimation of the correctors strengths necessary to perform the corrections of the errors. In this study advanced correction schemes for the residual orbit, the linear coupling and the ring tune are described. The impact of magnet tolerances on the residual errors, on the correctors technological choice and on the beam screen design are discussed. In particular the effect of the dipole a2 error is emphasized.
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TUPVA002	Updates on the Optics of the Future Hadron-Hadron Collider FCC-hh	dipole, optics, sextupole, hadron	2023
	A. Chancé, D. Boutin, B. Dalena CEA/IRFU, Gif-sur-Yvette, France B.J. Holzer, A. Langner, D. Schulte CERN, Geneva, Switzerland
	Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol) project has received funding from the European Union's Horizon 2020 research and innovation programme under grant No 654305. The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the three options considered for the next generation accelerator in high-energy physics as recommended by the European Strategy Group. The layout of FCC-hh has been optimized to a more compact design following recommendations from civil engineering aspects. The updates on the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV. Special emphasis is put on the dispersion suppressors and general beam cleaning sections as well as first considerations of injection and extraction sections.
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TUPVA016	Identification and Analysis of Prompt Dose Maxima in the Insertion Regions IR1 and IR5 of the Large Hadron Collider	radiation, luminosity, operation, dipole	2078
	O. Stein, M. Brugger, S. Danzeca, R. Garcia Alia, Y. Kadi, M. Kastriotou, C. Martinella, C. Xu CERN, Geneva, Switzerland
	During the operation of the LHC the continuous particle losses create a radiation field in the LHC tunnel and the adjacent caverns. Exposed electronics and accelerator components show dose dependent accelerated aging effects and stochastic Single Event Effects which can lead to faults and downtime of the LHC. In order to achieve an optimal life duration, the position of the equipment is chosen in dependency of the amplitude of the radiation fields. Therefore, it is crucial to monitor the prompt dose distributions along the whole LHC. By using the LHC beam loss monitor and RadMon systems, the prompt dose during the accelerator operation is continuously monitored. Measurements in the long straight sections and the dispersion suppressors in IR1 (ATLAS) and in IR5 (CMS) have shown that the radiation levels have localised maxima which exceed the base line by 1 to 2 orders of magnitude. The analysis of these radiation peaks will be presented and the underlying loss mechanisms will be discussed. The results will help to identify areas not suitable for radiation sensitive electronics. Implications on the expected radiation levels for High-Luminosity LHC are also discussed.
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TUPVA018	Macroparticle Simulation Studies of the LHC Beam Dynamics in the Presence of Electron Cloud	simulation, electron, dipole, octupole	2081
	A. Romano, G. Iadarola, K.S.B. Li, G. Rumolo CERN, Geneva, Switzerland
	Beam quality degradation caused by the Electron Cloud (EC) effects has been identified as one of the main performance limitations for the high intensity 25 ns beams in the Large Hadron Collider (LHC). When a proton bunch passes through an EC, electrons are attracted towards the transverse center of the beam resulting into an increasing electron density within the bunch. The effects driven by the interaction of the electrons with the bunch have been studied with macroparticle simulations in order to evaluate, in different operational scenarios, the threshold for the coherent instabilities as well as the incoherent tune spread. This contribution will summarize the main findings of the simulation study and compare them with the available experimental observations.
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TUPVA023	Effect of Quench Heater and CLIQ Firing on the Circulating HL-LHC Beam	dipole, simulation, collimation, superconducting-magnet	2101
	M. Valette, L. Bortot, A.M. Fernandez Navarro, B. Lindstrom, R. Schmidt, A.P. Verweij, D. Wollmann CERN, Geneva, Switzerland
	Funding: Research supported by the HL-LHC project. A small vertical orbit oscillation of the LHC beam was observed following a quench of a main dipole magnet. This effect was thought to be caused by the current dis-charged in the quench heater (QH) strips of the superconducting magnet and confirmed in dedicated experiments with beam in the LHC. Quench heater connection schemes with the largest effect have been identified for the LHC and its future HiLumi upgrade (HL-LHC). Furthermore, the impact on the beam following discharges of the Coupling-Loss Induced Quench (CLIQ) system, a novel technology to protect high current superconducting magnets in case of a quench, was studied to evaluate the possible failure cases.
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TUPVA037	FCC-hh Final-Focus for Flat-Beams: Parameters and Energy Deposition Studies	optics, luminosity, collider, hadron	2139
	J.L. Abelleira, E. Cruz Alaniz, A. Seryi, L. van Riesen-Haupt JAI, Oxford, United Kingdom M.I. Besana CERN, Geneva, Switzerland
	Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol), EU's Horizon 2020 grant No 654305. The international Future Circular Collider (FCC) study comprises the study of a new scientific structure in a tunnel of 100 km. This will allow the installation of two accelerators, a 45.6'175 GeV lepton collider and a 100-TeV hadron collider. An optimized design of a final-focus system for the hadron collider is presented here. The new design is more compact and enables unequal β^* in both planes, whose choice is justified here. This is followed by energy deposition studies, where the total dose in the magnets as a consequence of the collision debris is evaluated.
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TUPVA038	Non Linear Field Correction Effects on the Dynamic Aperture of the FCC-hh	lattice, collider, interaction-region, dynamic-aperture	2143
	E. Cruz Alaniz, A. Seryi JAI, Oxford, United Kingdom E.H. Maclean, R. Martin, R. Tomás CERN, Geneva, Switzerland
	Funding: European Union's Horizon 2020 research and innovation programme under grant No 654305. The Future Circular Collider (FCC) design study aims to develop the designs of possible circular colliders in the post LHC era. In particular the FCC-hh will aim to produce proton-proton collisions at a center of mass energy of 100 TeV. Given the large beta functions and integrated length of the quadrupoles of the final focus triplet the effect of systematic and random non linear errors in the magnets are expected to have a severe impact on the stability of the beam. Following the experience on the HL-LHC this work explores the implementation of non-linear correctors to minimize the resonance driving terms arising from the errors of the triplet. Dynamic aperture studies are then performed to study the impact of this correction.
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TUPVA039	Effect of Alignment Errors and Orbit Correctors on the Interaction Region of the FCC-hh	interaction-region, optics, dipole, collider	2147
	E. Cruz Alaniz, J.L. Abelleira, A. Seryi, L. van Riesen-Haupt JAI, Oxford, United Kingdom J.L. Abelleira, L. van Riesen-Haupt University of Oxford, Oxford, United Kingdom
	Funding: European Union's Horizon 2020 research and innovation programme under grant No 654305. The Future Circular Collider (FCC) design study aims to develop the design of possible circular colliders in the LHC era. In particular the FCC-hh will aim to produce proton-proton collisions at a center of mass energy of 100 TeV. The interaction region has been designed to meet the requirements in terms of energy and luminosity. However, as it is the case in any real accelerator, misalignments in the magnets are likely to occur; the effect of these misalignments, if not properly compensated for, can jeopardize the performance of the machine. This study contemplates alignment and field errors in the interaction region in order to estimate the tolerance necessary to provide a good correction measured in terms of deviation of the orbit and strength of the correctors.
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TUPVA041	Exploring the Triplet Parameter Space to Optimise the Final Focus of the FCC-hh	optics, shielding, target, radiation	2155
	L. van Riesen-Haupt, J.L. Abelleira, E. Cruz Alaniz, A. Seryi JAI, Oxford, United Kingdom
	One of the main challenges when designing final focus systems of particle accelerators is maximising the beam stay clear in the strong quadrupole magnets of the inner triplet. Moreover it is desirable to keep the quadrupoles in the inner triplet as short as possible for space and costs reasons but also to reduce chromaticity and simplify corrections schemes. An algorithm that explores the triplet parameter space to optimise both these aspects was written. It uses thin lenses as a first approximation and MADX for more precise calculations. In cooperation with radiation studies, this algorithm was then applied to design an alternative triplet for the final focus of the Future Circular Collider.
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TUPVA042	K-Modulation Developments via Simultaneous Beam Based Alignment in the LHC	optics, sextupole, closed-orbit, simulation	2159
	L. van Riesen-Haupt, A. Seryi JAI, Oxford, United Kingdom J.M. Coello de Portugal, E. Fol, R. Tomás, R. Tomás CERN, Geneva, Switzerland
	Funding: EuroCirCol A parasitic effect of k-modulation is that if the modulated quadrupole has an offset the modulation results in a dipole like kick forcing the beam on a new orbit. This paper presents a new method using the orthonormality of singular value decomposition that uses this new orbit to estimate the offset. This could be used to measure misalignments or crossing angles but could also help improve k-modulation \beta measurements by predicting the parasitic tune change caused by the new orbit not passing through the centre of the sextupoles.
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TUPVA043	A Code for Optimising Triplet Layout	collider, shielding, focusing, proton	2163
	L. van Riesen-Haupt, J.L. Abelleira, E. Cruz Alaniz, A. Seryi JAI, Oxford, United Kingdom
	Funding: EuroCirCol One of the main challenges when designing final focus systems of particle accelerators is maximising the beam stay clear in the strong quadrupole magnets of the inner triplet. Moreover it is desirable to keep the quadrupoles in the inner triplet as short as possible for space and costs reasons but also to reduce chromaticity and simplify corrections schemes. An algorithm that explores the triplet parameter space to optimise both these aspects was written. It uses thin lenses as a first approximation for a broad parameter scan and MADX for more precise calculations. The thin lens algorithm is significantly faster than a full scan using MADX and relatively precise at indicating the approximate area where the optimum solution lies.
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TUPVA051	Magnets and Wien Filters for SECAR	dipole, multipole, target, high-voltage	2191
	F. Bødker, N. Hauge, J. Kristensen Danfysik A/S, Taastrup, Denmark G.P.A. Berg, M. Couder University of Notre Dame, Indiana, USA H. Schatz NSCL, East Lansing, Michigan, USA
	The Separator for Capture Reactions, SECAR, is being built at Michigan State University for the study of low-energy capture reactions. The high performance magnets and two large Wien filters required to reach the very high recoil mass separation factor are being designed and produced at Danfysik to the SECAR specifications. The 2.4 m long Wien filters with a weight of 35 ton each including a large vacuum tank have high electrode voltages of ±300 kV combined with a magnetic field of 0.12 T. Challenging design requirements for integrated magnetic and electrostatic field homogeneity combined with tight tolerance on the effective lengths have been meet. The dipole magnets for this facility are special in having stringent ±0.5 mm effective magnetic length specifications in a wide excitation range and the transverse field boundary variation is described by a 4th order polynomial. Most of the dipoles are made with variable segmented field clamps in order to keep the deviation of the magnetic fringe field boundary within the required ±0.1 mm. The wide range of different quadrupole, sextupole and octupole magnets are required to meet the specified magnetic length with a tight tolerance.
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TUPVA057	Design Study for a Prototype Alvarez-Cavity for the Upgraded Unilac	cavity, DTL, operation, ion	2205
	M. Heilmann, X. Du, P. Gerhard, L. Groening, M. Kaiser, S. Mickat, A. Rubin GSI, Darmstadt, Germany A. Seibel IAP, Frankfurt am Main, Germany
	The design study describes the prototype Alvarez-tank of the new post-stripper of the UNILAC. A prototype with 17 drift tubes (including quadrupole singulets) of 3 m of total length and 2 m of diameter will be manufactured. This cavity features new drift tube shape profiles to provide for high shunt impedance at a maximum electric surface field of 1 Ek. Additionally, it allows realization and high power testing of an optimized stem configuration for field stabilization. In case of successful tuning and long-term operation at high power level, it shall be used as a first of series cavity of the new UNILAC post-stripper DTL.
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TUPVA060	Upgrade of GSI HADES Beamline in Preparation for High Intensity Runs	target, optics, beam-losses, dipole	2214
	M. Sapinski, P. Boutachkov, S. Damjanovic, K. Dermati, C.M. Kleffner, J. Pietraszko, T. Radon, S. Ratschow, S. Reimann, W. Sturm, B. Walasek-Höhne GSI, Darmstadt, Germany
	HADES is a fixed target experiment using SIS18 heavy-ion beams. It investigates the microscopic properties of matter formed in heavy-ion, proton and pion - induced reactions in the 1-3.5 GeV/u energy regime. In 2014 HADES used a secondary pion beam produced by interaction between high-intensity nitrogen primary beam and a beryllium target. In these conditions beam losses, generated by slow extraction and beam transport to the experimental area, led to activation of the beam line elements and triggered radiation alarms. The primary beam intensity had to be reduced and the beam optics modified in order to keep radiation levels within the allowed limits. Similar beam conditions are requested by HADES experiment for upcoming run in 2018 and in the following years. Therefore, a number of measures have been proposed to improve beam transmission and quality. These measures are: additional shielding, additional beam instrumentation, modification of beam optics and increase of vacuum chambers' apertures in critical locations. The optics study and preliminary results of FLUKA simulations for optimization of location of loss detectors are presented.
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TUPVA062	Construction of the MYRRHA Injector	cavity, diagnostics, beam-diagnostic, linac	2221
	D. Mäder, H. Höltermann, H. Hähnel, D. Koser, K. Kümpel, U. Ratzinger, W. Schweizer BEVATECH, Frankfurt, Germany C. Angulo, J. Belmans, L. Medeiros Romão, D. Vandeplassche Studiecentrum voor Kernenergie - Centre d'Étude de l'énergie Nucléaire (SCK•CEN), Mol, Belgium M. Busch, H. Podlech IAP, Frankfurt am Main, Germany
	A collaboration of SCK•CEN, IAP and BEVATECH GmbH is currently constructing the room temperature CH section of the 16.6 MeV CW proton injector for the MYRRHA project. The elaboration of all the construction readiness files for the construction of the accelerating cavities of the first CH section (1.5 to 5.9 MeV) is ongoing. In parallel, the planning, development and fabrication of all further components of this accelerator section is in progress, while the full study for the remaining section is under preparation. This contribution is documenting the most recent status.
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TUPVA064	Updated Cavities Design for the FAIR p-Linac	linac, cavity, proton, coupling	2227
	A. Almomani, M. Busch, F.D. Dziuba, U. Ratzinger, R. Tiede IAP, Frankfurt am Main, Germany F.D. Dziuba, C.M. Kleffner GSI, Darmstadt, Germany
	The research program of antiproton beams for the FAIR facility requires a dedicated 68 MeV, 70 mA proton injector. This injector will consist of an RFQ followed by six room temperature Crossbar H-type CH-cavities operated at 325 MHz. The beam dynamics had been revised by IAP Frankfurt in collaboration with GSI-FAIR in Darmstadt to further optimize the design. This step was followed by cavity RF design. The detailed mechanical cavity design will begin in 2017, while the quadrupole lenses are under production already. In this paper, besides an overview the RF design of the coupled cavities with integrated focusing triplets will be a main focus.
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TUPVA067	The KONUS IH-DTL Proposal for the GSI UNILAC Poststripper Linac Replacement	linac, emittance, DTL, ion	2230
	H. Hähnel, U. Ratzinger, R. Tiede IAP, Frankfurt am Main, Germany
	Funding: BMBF 05P15RFRBA The GSI UNILAC will serve as the main injector for the upcoming FAIR project. Since the existing Alvarez DTL is in operation for more than 40 years, it has to be replaced to ensure reliable operation in the future. To this purpose a compact and efficient linac design based on IH-type cavities and KONUS beam dynamics has been designed at IAP Frankfurt. It consists of five 10⁸ MHz IH-type cavities that can be operated by the existing UNILAC RF amplifier structure. The transversal focusing scheme is based on magnetic quadrupole triplet lenses. The optimized design provides full transmission and low emittance growth for the design current of 15 emA U²⁸⁺ accelerating the beam from 1.4 MeV/u to 11.4 MeV/u. Extensive error studies were performed to define tolerances and verify the stability of the design with respect to misalignment and injection parameters. The design provides a compact and cost efficient alternative to a new Alvarez linac. With a total length of just 22.8 meters it will leave room for future energy upgrades in the UNILAC tunnel. H. Hähnel, U. Ratzinger, R. Tiede, Efficient Heavy Ion Acceleration with IH-Type Cavities for High Current Machines in the Energy Range up to 11.4 MeV/u, in Proc. LINAC2016, paper TUPLR070
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TUPVA070	Dipole Compensation of the 176 MHz MYRRHA RFQ	dipole, rfq, simulation, proton	2240
	K. Kümpel, H.C. Lenz, N.F. Petry, H. Podlech IAP, Frankfurt am Main, Germany A. Bechtold NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany C. Zhang GSI, Darmstadt, Germany
	The MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) Project is planned as an accelerator driven system (ADS) for the transmutation of long-living radioactive waste. For this project a cw 4-Rod-RFQ with 176 MHz and a total length of about 4 m is required. It is supposed to accelerate protons from 30 keV up to 1.5 MeV. One of the main tasks during the development of the RFQ is the very high reliability of the accelerator to limit the thermal stress inside the reactor. Another challenge was to compensate the dipole component of the MYRRHA-RFQ which is due to the design principle of 4-Rod-RFQs. This dipole component is responsible for shifting the ideal beam axis from the geometrical center of the quadrupole downwards. Design studies with CST MICROWAVE STUDIO have shown that the dipole component can be almost completely compensated by widening the stems alternately so that the current paths of the lower electrodes are increased. C. Zhang, H. Podlech: NEW REFERENCE DESIGN OF THE EUROPEAN ADS RFQ ACCELERATOR FOR MYRRHA. In Proceedings of IPAC'14, 3223-3225 (2014)
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TUPVA075	Beam Dynamics for a High Current 3 MeV, 325 MHz Ladder-RFQ	emittance, rfq, linac, proton	2252
	M. Syha, M.A. Obermayer, U. Ratzinger, M. Schütt IAP, Frankfurt am Main, Germany
	Funding: BMBF 05P12RFRB9 After the successful measurements with a 0.8 m prototype (see Fig. 1), a 3.3 m Ladder-RFQ is under construction at IAP, Goethe University Frankfurt. It is designed to accelerate protons from 95 keV to 3 MeV according to the design parameters of the Proton Linac at FAIR. The development of an adequate beam dynamics design was done in close collaboration with the IAP resonator design team. A constant vane curvature radius and at the same time a flat voltage distribution along the RFQ was reached by implantation of the modulated vane geometry into CST Microwave Studio RF field simulations. Points of reference for the beam dynamics layout are the beam dynamics designs of C. Zhang* and A. Lombardi. The Code RFQGen* was used for the beam dynamics simulations. In order to increase the transmission and to reduce the longitudinal and transversal exit emittances, the evolution of the modulation parameter m within the first 90 cells was investigated in detail. This paper presents the simulation results of this study. * Chuan Zhang, Beam Dynamics for the FAIR Proton-Linac RFQ, IPAC 2014, Dresden C. Rossi et al., The Radiofrequency Quadrupole Accelerator for the LINAC4, LINAC08, Victoria, BC, Canada *L. Young, RFQGen User Guide, Los Alamos Scientific Lab., NM (USA), 2016.
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TUPVA077	The Phase Slip Factor of the Electrostatic Cryogenic Storage Ring CSR	ion, storage-ring, cryogenics, simulation	2255
	M. Grieser, R. Hahn, S. Vogel, A. Wolf MPI-K, Heidelberg, Germany
	For the determination of the momentum spread of an ion beam from the measurable revolution frequency distribution the knowledge of the phase slip factor of the storage ring is necessary. At various working points of the cryogenic storage ring CSR installed at the MPI for Nuclear Physics in Heidelberg the slip factor was simulated and compared with measurements. The predicted functional relationship of the slip factor and the horizontal tune depends on the different islands of stability, which has been experimentally verified. This behavior of the slip factor is in clear contrast to magnetic storage rings. In the paper we compare the results of the simulations with the measurements
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MOPAB014

Generating Low Beta Regions With Quadrupoles for Final Muon Cooling

emittance, simulation, collider, betatron

107

J.G. Acosta, L.M. Cremaldi, T.L. Hart, S.J. Oliveros, D.J. Summers
UMiss, University, Mississippi, USA
D.V. Neuffer
Fermilab, Batavia, Illinois, USA

Funding: Work supported by Fermi Research Alliance, LLC under contract No. DE-AC02-07CH11359
Muon beams and colliders are rich sources of new physics, if muons can be cooled. A normalized rms transverse muon emittance of 280 microns has been achieved in simulation with short solenoids and a betatron function of 3 cm. Here we use ICOOL, G4beamline, and MAD-X to explore using a 400 MeV/c muon beam and strong focusing quadrupoles to approach a normalized transverse emittance of 100 microns and finish 6D muon cooling. The low beta regions produced by the quadrupoles are occupied by dense, low Z absorbers, such as lithium hydride or beryllium, that cool the beam. Equilibrium transverse emittance is linearly proportional to the beta function. Reverse emittance exchange with septa and/or wedges is then used to decrease transverse emittance from 100 to 25 microns at the expense of longitudinal emittance for a high energy lepton collider. Work remains to be done on chromaticity correction.

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MOPAB041

Quadrupole Scan Measurements in the Beam Transport Line between DESY II and PETRA III

emittance, focusing, synchrotron, beam-transport

174

J. Keil, H. Ehrlichmann, G.K. Sahoo, R. Wanzenberg
DESY, Hamburg, Germany

PETRA III is a 6 GeV third generation synchrotron light source in Hamburg, Germany. The storage ring is operated with a typical beam current of 100 mA and is running in top-up mode. The beam delivered to PETRA III is accelerated by a fast cycling booster synchrotron (DESY II), extracted in a 203 m long beam transport line (E-Weg) and injected afterwards into PETRA III. In the framework of PETRA IV upgrade scenarios the potential for decreasing the extracted emittance from DESY II has been investigated which can be achieved by lowering the extraction energy to 5 GeV and increasing the focusing in DESY II. In addition measuring the emittance of the extracted beam from DESY II and the optics in the beam transport line can help to better understand and improve the injection efficiency of PETRA III. By changing the quadrupole strength and measuring the beam size downstream on a screen monitor in the E-Weg the emittance of DESY II and the Twiss functions at the quadrupole in the E-Weg have been determined. Measurements at different energies and tunes of DESY II will be shown and compared with calculations.

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MOPAB046

Lattice Considerations for the Use of an X-Band Transverse Deflecting Structure (TDS) at SINBAD

dipole, lattice, cavity, electron

192

D. Marx, R.W. Aßmann, U. Dorda, U. Dorda, B. Marchetti, F. Mayet
DESY, Hamburg, Germany
F. Mayet
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany

An X-band TDS is a well-known device for the characterization of the longitudinal properties of an electron bunch in a linear accelerator. It is planned that a novel X-band TDS with variable polarization* will be installed within the next few years at SINBAD, an upcoming accelerator R&D facility at DESY**. There are several measurements that can be performed with the TDS, each with specific optics requirements to reach the highest possible resolution and keep induced energy spread to a tolerable level. Quadrupoles will be installed between the TDS and the screen to help satisfy these conditions. In this paper, the requirements for the bunch length measurements, a novel 3D charge density reconstruction technique and slice energy measurements are discussed and some simulation results for the slice energy measurement using example lattices are presented.
* A. Grudiev, CLIC-note-1067 (2016).
** B. Marchetti et al. X-band TDS project contribution to these conference proceedings.

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MOPAB047

Electron Beam Phase Space Tomography at the European XFEL Injector

emittance, electron, FEL, optics

196

M. Scholz, B. Beutner
DESY, Hamburg, Germany

The FEL process is determined by the 6D phase space distribution of relativistic electron bunches. Experimental reconstructions of these distributions are therefore a step foreward to understand the beam dynamics and to optimize FEL operation. The reconstructions of the transverse phase spaces can be acieved with tomographic methods. In the injector of the European XFEL, measurements for the reconstruction of the phase spaces were carried out using phase advance scans with multiple quadrupoles. The beam sizes were kept optimized at the measurement screen. A transversely deflecting cavity (TDS) was used to streak the beam vertically. That allows to do longitudinally slice resolved measurements of the horizontal phase space. The horizontal streak required for the slice measurements in the vertical plane was achieved with a correlated linear energy spread and dispersion. In this paper, we present measurement results showing longitudinal slice resolved reconstructions of the transverse phase spaces taken in the European XFEL injector.

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MOPAB049

Development of a Focusing System for the AXSIS Project

linac, solenoid, plasma, focusing

203

T. Vinatier, R.W. Aßmann, U. Dorda, B. Marchetti
DESY, Hamburg, Germany

In this paper, we investigate with ASTRA simulations the achievable performances for several focusing systems considered in the AXSIS project. We focus our attention on the requirements in terms of position of the focal point and bunch transverse size at this point. We show that they cannot be fulfilled with a solenoid resistive electro-magnet, but that it is possible when using a solenoid permanent magnet. The use of a quadrupole doublet proves to be adequate to fulfil the requirement on the position of the focal point and be very close to the one on the bunch transverse size, which could possibly be achieved by a further optimization of the parameters of the doublet. Finally, we also investigate the possibility to use an active plasma lens, showing that it could easily fulfil the requirements but that several points must be carefully studied before considering its implementation.

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MOPAB067

Response of Scintillating Screens to High Charge Density Electron Beam

electron, linac, diagnostics, experiment

268

F. Miyahara, S. Kishimoto, M. Satoh, Y. Seimiya, T. Suwada
KEK, Ibaraki, Japan
M. Koshimizu
Tohoku University, School of Science, Sendai, Japan

Inorganic scintillating screens are very useful tool to measure transverse profile of charged particle beams. The cerium-doped yttrium:aluminum:garnet (YAG:Ce) crystal scintillator is used in many accelerating facilities. The scintillating screen shows good resolution comparable to that of OTR screen. However, response to high charge density electron beam, more than 10 nC per square millimeter, has not been clarified. In KEK e⁺/e⁻ injector linac, the charge areal density (σ) will exceed 25 nC per square mm. Thus, beam tests has been performed on YAG:Ce, LYSO, and BGO crystals for 1.5 GeV, 1 nC/bunch electron beam at the linac. Saturation of the luminescence which causes degradation of the resolution has been observed above 1 nC per square mm in those crystals. We will report the response of the scintillating screens to high charge density electron beam and discuss the degradation of the resolution due to the saturation of the light yield.

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MOPAB068

Bunch Shape Monitor Development in J-PARC Linac

vacuum, electron, focusing, target

271

A. Miura, J. Tamura
JAEA/J-PARC, Tokai-mura, Japan
Y. Liu
KEK/JAEA, Ibaraki-Ken, Japan
T. Miyao
KEK, Ibaraki, Japan

At Japan accelerator reserch complex (J-PARC), the linac, which serves as the injector for the downstream 3-GeV synchrotron, accelerates a negative-hydrogen-ion beam (H⁻) to obtain a 400-MeV beam energy. We use an accelerating frequency of 324 MHz for the accelerator cavities and of 972 MHz. Both the centroid-phase set point at the frequency jump from 324 MHz to 972 MHz and the phase-width control are key issues for suppressing the excess beam loss. In order to optimize a set point of the tuning cavities, we developed a bunch-shape monitor (BSM) to measure the phase width as well as a tuning strategy to minimize the beam loss. In the development of the BSM, the design developed in the INR, Russia. Because the BSM had first experienced to be used between accelearation cavities, we need to protect the leak-magnetic field from quadrupole magnets and outgas impacts to cavities. We installed a BSM again in the beamline, BSM started to measure the phase width and evaluated its performances with a peak-beam-current dependence. We proposed new strategy to use BSM-measurment data for the tuning cavity. This paper describes the BSM development, its modification, and new strategy.

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MOPAB069

Measurement of Transverse Multipole Moments of the Proton Beam in the J-PARC MR

multipole, proton, simulation, vacuum

274

T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
A. Ichikawa, A. Minamino, K.G. Nakamura, Y. Nakanishi, T. Nakaya, W. Uno
Kyoto University, Kyoto, Japan
T. Koseki, H. Kuboki, M. Okada
KEK, Tokai, Ibaraki, Japan

Funding: This work was partially supported by MEXT/JSPS KAKENHI Grant Numbers 25105002 and 16H06288.
Transverse multipole moments (quadrupole and more) of the beam may give important informations of the beam such as beam sizes, nonlinear resonances and so on. However higher moments are difficult to measure because signal-to-noise-ratio becomes smaller proportional to the n-th order of the beam-radius-to-vacuum-duct-radius ratio. In order to increase the SNR and to extend the multipole order, we developed and installed a 16 electrode beam monitor in the J-PARC MR, which consists of guard-potential-separated 16 striplines. The calibration method, beam test results will be presented.

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MOPAB084

Online Measurement of Electrode Gains for Stripline Beam Position Monitor in the HLS II Storage Ring

storage-ring, site, radiation, operation

316

F.F. Wu, L. Lin, X.Y. Liu, P. Lu, B.G. Sun, L.L. Tang, J.G. Wang, J.H. Wei, Y.L. Yang, T.Y. Zhou, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Supported by the National Key Research and Development Program of China(No. 2016YFA0402000) and the National Science Foundation of China (11575181, 11605202)
Three axially symmetric stripline beam position monitors were installed in the HLS II storage ring and each stripline BPM was machined with button BPM together. Due to mechanical errors of stripline BPM, differences in electrode gains will lead to measurement error for beam position and mutual coupling between beam horizontal position and vertical position. So it is very important to calibrate electrode gains for axially symmetric BPM. A method was proposed to calibrate electrode gains of this kind of BPM. This method is suitable for all axially symmetric BPMs, whether stripline BPM or button BPM. The online calibrated gains were compared with offline calibrated gains and the results have shown that online and offline calibrated electrode gains were basically consistent.

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MOPAB085

Introduction of Beam Position Monitor System in the HLS II Storage Ring

storage-ring, closed-orbit, feedback, brilliance

319

F.F. Wu, L. Lin, X.Y. Liu, P. Lu, B.G. Sun, L.L. Tang, J.G. Wang, J.H. Wei, K. Xuan, Y.L. Yang, T.Y. Zhou, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: Supported by the National Key Research and Development Program of China (No. 2016YFA0402000) Supported by the National Science Foundation of China (11575181, 11605202)
Beam position monitor(BPM) system for the HLS II storage ring were designed in the HLS II upgrade project. This system is composed of BPM, BPM processor embedded with IOC and OPI. Every component of BPM system is introduced in this paper. BPM processors have different modes of data, such as ADC data, turn-by-turn(TBT) data, fast acquirement(FA) data and slow acquirement(SA) data. Different modes of data are used to different applications. Two applications based on SA data of the BPM system, such as BBA for quadrupole magnet center measurement and beam closed orbit feedback, are described in detail. The result of BBA shows that most magnetic centers of quadrupole magnets are in the range of [-1 mm, 1 mm] with respect to BPM electric centers. The result of beam closed orbit feedback shows that beam orbit stability when the closed orbit feedback system is on is far better than that when the closed orbit feedback system is off.

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MOPAB099

Design Study of Drift Tube Linac for BNCT Accelerator

DTL, simulation, rfq, linac

359

Y. Lee, S.W. Jang, E.-S. Kim
Korea University Sejong Campus, Sejong, Republic of Korea
B.H. Choi
IBS, Daejeon, Republic of Korea
D.S. Kim
Dawonsys, Siheung-City, Republic of Korea
Z. Li
SCU, Chengdu, People's Republic of China

A-BNCT accelerator is being developed as a proton accelerator with a high beam current of 50 mA for effective cancer therapy. Drift tube linac (DTL) with the length of 4.5 m is composed of 1 tank and 48 drift tubes (DTs). Proton beam is accelerated from 3 MeV to 10 MeV. Electromagnetic quadrupoles (EMQs) are inserted into every DT for transverse focusing. Slug tuners and post couplers (PCs) are used for accelerating field stabilization and resonant frequency tuning, respectively. The beam dynamics and engineering design for the DTL are performed for effective beam acceleration, and the design results are in detail presented.

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MOPAB115

Transverse Beam Phase-Space Measurement Experience at CTF3

emittance, optics, collider, linear-collider

393

D. Gamba, B. Constance, R. Corsini, S. Döbert, L. Malina, T. Persson, J. Roberts, A.P. Rollings, P.K. Skowroński, F. Tecker
CERN, Geneva, Switzerland
L. Martin
JAI, Oxford, United Kingdom
A.L. Peirson Serratosa
Oxford University, Physics Department, Oxford, Oxon, United Kingdom

One of the objective of the CLIC Test Facility (CTF3) at CERN is to demonstrate the CLIC Drive Beam Recombination concept. An accurate control of the transverse beam parameters is necessary in order to succeed in preserving the beam quality after the recombination. During the activity of the facility we improved our tools and technique for characterising the transverse phase space of the beam before and after recombination. The common quadrupole scan technique was improved by performing constant-beam-size measurement and it was enriched by a tomographic reconstruction of the phase-space. Moreover studies have been performed in order to estimate and subtract the impact of dispersion on such a measurements. An overview of these techniques will be presented with actual measurements performed over the last year of operations of the facility.

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MOPAB137

Validation of a Novel Emittance Diagnostic Method for Beams with Significant Space Charge

emittance, space-charge, focusing, simulation

451

R.B. Fiorito, C.P. Welsch, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom
M.E. Conde, N.R. Neveu, J.F. Power
ANL, Argonne, Illinois, USA
O. Mete Apsimon
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
A.G. Shkvarunets
UMD, College Park, Maryland, USA

Funding: Work supported by the EU under grant agreement 624890, the STFC Cockcroft Institute Core Grant No. ST/G008248/1.
Exact knowledge of beam emittance is of central importance for essentially every accelerator. However, there are only few methods to determine it when the beam has significant space charge. We report on our progress to validate a novel diagnostic method that has been proposed to determine the RMS emittance of an electron beam with space charge. This method uses RMS divergence and beam size data measured at a screen placed in a free drift region for selected values of magnetic focusing strength. A novel algorithm is then used to determine the cross correlation term and consequently the RMS emittance of the beam. Simulations, quadrupole scans, phase space tomography and optical diffraction-dielectric foil radiation interferometry are currently being employed to determine and compare the horizontal (x) and vertical (y) emittances of the 14 MeV witness electron beam at Argonne National Laboratory's Wakefield Accelerator. The results of simulations and current measurements are presented and the advantages of the new technique are discussed.

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MOPAB140

Phase-Space Analysis Using Tomography for the Muon g-2 Experiment at Fermilab

experiment, proton, target, storage-ring

462

D. Stratakis
Fermilab, Batavia, Illinois, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
In the next decade the Fermilab Muon Campus will host two world class experiments dedicated to the search for signals of new physics. The Muon g-2 experiment will determine with unprecedented precision the anomalous magnetic moment of the muon. The Mu2e experiment will improve by four orders of magnitude the sensitivity on the search for the as-yet unobserved Charged Lepton Flavor Violation process of a neutrinoless conversion of a muon to an electron. Maintaining and preserving a high density of particles in phase-space is an important requirement for both experiments. This paper presents a new experimental method for mapping the transverse phase space of a particle beam based on tomographic principles. We simulate our technique using the tracking code GEANT4, to ascertain accuracy of the reconstruction. Then we apply the technique to a series of proof-of-principle simulation tests to study injection, transport and extraction of muon and proton beams for the Fermilab g-2 and Mu2e Experiments.

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MOPAB150

Imaging the Spatial Modulation of a Relativistic Electron Beam

electron, experiment, scattering, emittance

480

C. Zhang, W.S. Graves, L.E. Malin, J. Spence
Arizona State University, Tempe, USA
D.B. Cesar, J.M. Maxson, P. Musumeci, A. Urbanowicz
UCLA, Los Angeles, USA
C. Limborg, E.A. Nanni
SLAC, Menlo Park, California, USA

Funding: Work supported by NSF awards 1632780, 1415583, 1231306 and DOE award de-sc0009914
We describe Bragg diffraction of relativistic electron beams through a patterned Si crystal consisting of alternating thick and thin strips to produce nanometer scale electron density modulations. Multi-slice simulations show that a two-beam situation can be set up where, for a particular thickness of Si, nearly 100% of the electron beam is diffracted. Plans are underway to carry out experiments showing this effect in UCLA's ultrafast electron microscopy lab with 3.5 MeV electrons. We will select either the diffracted beam or the primary beam with a small aperture in the diffraction plane of a magnetic lens, and so record either the dark or bright field magnified image of the strips. Our first goal is to observe the nanopatterned beam at the image plane. We will then investigate various crystal thickness and sample orientations to maximize the contrast in the pattern and explore tuning the period of the modulation through varying magnification.

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MOPIK017

Simultaneous Generation of Drive and Witness Beam for Collinear Wakefield Acceleration

wakefield, acceleration, emittance, controls

535

G. Ha
POSTECH, Pohang, Kyungbuk, Republic of Korea
M.E. Conde, D.S. Doran, W. Gai, J.G. Power
ANL, Argonne, Illinois, USA

Funding: This work is supported by Department of Energy, Office of High Energy Physics, under Contract No. DE-AC02-06CH11357.
Generating the drive and witness bunch for collinear wakefield acceleration (CWFA) requires precise control of the longitudinal bunch shape for each bunch as well as the controlling their separation. The emittance exchange (EEX) beamline and a transverse mask can be used to achieve all of these requirements. First, this EEX-based method can independently control the longitudinal bunch shape of each bunches so that the drive bunch is shaped to generate a high transformer ratio while witness bunch is shaped to suppress its energy spread. Second, the timing jitter between the drive and witness bunch poses a serious limitation to the CWFA scheme but the EEX-based method eliminates this since both bunches are generated at the same time and share the exactly same beamline so there are no relative errors. In this paper, we confirm the feasibility of this EEX-based method for simultaneous generation with simulation for CWFA in a dielectric structure.

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MOPIK030

Design of a Beamline From a TR24 Cyclotron for Biological Tissues Irradiation

emittance, cyclotron, proton, dipole

564

E. Bouquerel, T. Adam, G. Heitz, C. Maazouzi, C. Matthieu, M. Pellicioli, M. Rousseau, C. Ruescas, J. Schuler, E.K. Traykov
IPHC, Strasbourg Cedex 2, France

Funding: The PRECy project is supported by the Contrat de Projet Etat-Région (CPER) Alsace Champagne-Ardenne Lorraine.
The PRECy project foresees the use of a 16-25 MeV energy proton beam produced by the recently installed TR24 cyclotron, CYRCé, at the Institut Pluridisciplinaire Hubert Curien (IPHC) of Strasbourg for biological tissues irradiation. One of the exit ports of the cyclotron will be used for this application along with a combination magnet. The platform will consist of up to 3 or 5 experimental stations linked to beamlines in a dedicated area next to the cyclotron vault. One of the beamlines will receive proton beams of a few cm diameter at intensities up to 100 nA. The status of the design of this first beam line is presented.

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MOPIK031

COSY Extraction Line Characterization and Modeling

extraction, optics, proton, storage-ring

567

B. Lorentz, M. Bai, Y. Dutheil, R. Tölle, C. Weidemann
FZJ, Jülich, Germany

COSY is a versatile racetrack-type synchrotron accelerating protons and deuterons in a range of rigidity between 1 T m and 11 T m. Circulating beam can be slowly extracted on a third order resonance and channeled towards different users. New users of the COSY beam have presented new challenges with specific requests, most notably in term of beam shape. This in turn drove a strong interest to develop and improve characterization and modeling methods in the COSY extraction beam line. In this contribution we will present the different beam characterization methods used and their limitations. We will then discuss the modeling of the line and the importance of an accurate and reliable model of the extraction line. Some of the latest beam measurements are presented and compared to modeled results.

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MOPIK039

Transport Channel of Secondary Ion Beam of Experimental Setup for Selective Laser Ionization With Gas Cell Gals

ion, target, simulation, neutron

589

N.Yu. Kazarinov, V. Bashevoy, G.G. Gulbekyan, I.A. Ivanenko, V.I. Kazacha, N.F. Osipov
JINR, Dubna, Moscow Region, Russia
S.G. Zemlyanoy
JINR/FLNR, Moscow region, Russia

GALS is the experimental setup intended for production and research of isobaric- and isotopically pure heavy neutron-rich nuclei. The beam line consists of two parts. The initial part is used for transport of the primary 136Xe ion beam with energy of 4.5-9.0 MeV/amu from the FLNR cyclotron U400M to the Pb target for the production of the studying ion beams. These beams have the following design parameters: the charge Z = +1, the mass A = 180-270 and the kinetic energy W = 40 keV. The second part placed after the target consists of SPIG (QPIG) system, the accelerating gap, the electrostatic Einzel lens, 90-degree spectrometric magnet (calculated value of the mass-resolution is equal to 1400) and the channel for the transportation of the ions from the focal plane of the magnet to a particle detector. The results of the simulation of particle dynamics and the basic parameters of the elements of the beam lines are presented in this report.

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MOPIK049

SPS Slow Extracted Spill Quality During the 2016 Run

target, extraction, power-supply, experiment

627

V. Kain, J. Bauche, P. Catherine, K. Cornelis, M.A. Fraser, L. Gatignon, C.M. Genton, B. Goddard, K. Kahle, M. Magrans de Abril, O. Michels, L.S. Stoel, F.M. Velotti
CERN, Geneva, Switzerland

The flux of particles slow extracted with the 1/3 integer resonance from the Super Proton Synchrotron at CERN should ideally be constant over the length of the extraction plateau, for optimum use of the beam by the fixed target experiments. The extracted intensity is controlled in feed-forward correction of the horizontal tune via the main SPS quadrupoles. The Mains power supply noise at 50 Hz and harmonics is also corrected in feed-forward by small amplitude tune modulation at the respective frequencies with a dedicated additional quadrupole circuit. In 2016 the spill quality could be much improved with respect to the situation of the previous year with more performant algorithms. In this paper the improved tools are described and the characteristics of the SPS slow extracted spill in terms of macro structure and typical frequency content are shown. Other sources of perturbation were, however, also present in 2016 which frequently caused the spill quality to be much reduced. The different effects are discussed and possible or actual solutions detailed. Finally, the evolution of the spill quality during characteristic periods in the 2016 run is presented.

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MOPIK057

Strategy of Beam Tuning Implementation for the SARAF MEBT and SC Linac

linac, solenoid, focusing, simulation

652

P.A.P. Nghiem, D. Uriot
CEA/DSM/IRFU, France
B. Dalena, J. Dumas, N. Pichoff
CEA/IRFU, Gif-sur-Yvette, France

Beam dynamics of the MEBT and Superconducting Linac in the SARAF accelerator are being finalized. A strategy for beam tuning implementation is applied to this section, leading to specifying the complete set of error tolerances / beam measurements / correctors. A systematic and precise methodology in several steps is applied, leading to fairly distributing the error budget, from which correction schemes are studied, allowing to determine the necessary beam measurements and correctors.

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MOPIK058

Beam Dynamic Studies for the SARAF MEBT and SC Linac

linac, cavity, rfq, simulation

655

J. Dumas, N. Pichoff, D. Uriot
CEA/IRFU, Gif-sur-Yvette, France
P.A.P. Nghiem
CEA/DSM/IRFU, France

The SARAF MEBT and Super Conducting Linac (SCL) transport and accelerate deuterons or protons from the RFQ to the final energy. In this report, beam dynamics studies for this section are described. A rational distribution of the different roles of the MEBT leads to defining its necessary quadrupole/rebuncher composition. This allows easy beam re-tuning following changes from the RFQ or the SC Linac. After observing evidences of beam losses mainly due to phase unhooking, efforts have been dedicated to enlarge the SCL longitudinal acceptance. A combination of cavity field phases is found so that the required final beam energy is also fulfilled.

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MOPIK060

Applying MOGA to Search Linear Lattice in Soleil Upgrade Project

lattice, emittance, sextupole, synchrotron

662

H.C. Chao, P. Brunelle, R. Nagaoka
SOLEIL, Gif-sur-Yvette, France

In the community of synchrotron radiation facilities, multi-bend structure becomes the trend of the storage ring design toward lower emittance. For SOLEIL upgrade project, the 7BA-6BA hybrid structure is one of the current options. This paper puts the focus on the 7BA section. There are many degrees of freedom to tweak and many constraints to follow. Here, the idea is to search and build the linear lattice utilizing Multi-Objective Genetic Algorithm (MOGA), which is efficient dealing with higher dimension optimization problems. Within MOGA, subsidiary matchings are performed to ensure certain criteria when the new generation is bred. Delicate designs and manipulations of the objective functions are needed, in order to have a better convergence without being trapped in a local minimum. The results will be shown and discussed.

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MOPIK071

Dispersion and Beam Optic Parameter Measurements in the Transport Line (E-Weg) from DESY II to PETRA III

emittance, optics, injection, synchrotron

692

G.K. Sahoo, K. Balewski, H. Ehrlichmann, J. Keil, R. Wanzenberg
DESY, Hamburg, Germany

The transport line E-Weg extends from the extraction septum in DESY II to the injection septum in PETRA III, and transports electrons at a beam energy of 6.0 GeV. It consists of 3 parts. The first part is in DESY tunnel, the second part is a long drift space in a slanted tube and the third part is in PETRA III tunnel. The vertical plane difference between the tunnels is 1.28 m. The optics was derived from initial values at Transfer Point (UGP) from a previous optics. The total length of the transfer line is about 203 m. Ten screen monitors are used to estimate the profiles of the beam spot for the optics measurements, while 8 BPMs, mostly adjacent to the screens, are used to compare and control the orbits. Two scrapers are installed on either side of the long drift space to trim the beam dimensions in transverse plane. Two FCTs are used to measure the beam current and transfer efficiency. The transverse dispersion and beta functions are measured by extracting the beam from DESY at different energies and analysing the beam profiles at the screen as well as positions at BPMs. The details of such measurements are reported in this paper.

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MOPIK073

Calibration of Linear Optics of COSY Based on ORM Data

factory, dipole, optics, sextupole

699

C. Weidemann, M. Bai, Y. Dutheil, F. Hinder, B. Lorentz
FZJ, Jülich, Germany

The COoler SYnchrotron in Jülich is a well suited accelerator for a precursor experiment on the direct measurement of the Electric Dipole Moment (EDM) of the deuteron (see* and references within). It provides polarized and unpolarized proton and deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c**, allows for phase space cooling and is highly flexible with respect to ion-optical settings***. Unfortunately, a model independent linear optics measurement is not possible and so far the existing MAD-X model of COSY does not provide an agreement with the actual machine parameters that is required by future experiments, such as the EDM experiment. Significant deviations with respect to the working point and linear optics have been reported****. As shown in*****, a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm in a C++ program was successfully developed and carefully benchmarked. This contribution presents the application of the new program on measured ORM data and its capabilities in calibrating linear optics as well as reconstructing machine imperfections such as gradient errors of quadrupole magnets and calibration factors of BPMs and steerers.
* D. Eversmann et al., PRL 115, no. 9, 094801 (2015).
** R. Maier, NIM A 390, 1 (1997).
*** C. Weidemann et al., PRSTAB 18, 020101 (2015).
**** D. Ji et al., IPAC16, doi:10.18429/JACoW-IPAC2016-TUPMR026.
***** C. Weidemann et al., IPAC16, doi:10.18429/JACoW-IPAC2016-THPMB009.

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MOPIK081

Study of HEPS Performance with Error Model and Simulated Correction

optics, sextupole, closed-orbit, simulation

721

D. Ji, Z. Duan, S.K. Tian, Y. Wei
IHEP, Beijing, People's Republic of China

As an important component of physics study on High Energy Photon Source (HEPS), error modelling and simu-lated correction will provide the guideline to restrict the manufacture redundancy of the hardware and estimate the real machine performance. In this paper, we present some work on error effect evaluation and simulated commis-sioning based on a recent lattice design.

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MOPIK082

First Turn Around Strategy for HEPS

lattice, closed-orbit, accumulation, dipole

724

Y.L. Zhao, Z. Duan, D. Ji, Y. Jiao, C. Li
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS) is a 6-GeV, kilometer-scale, quasi-diffraction limited storage ring light source to be built in China[1]. Getting the first turn and approaching the closed orbit is very important in accelerator commissioning. In order to make first turn beam commissioning efficiently, we develop a MATLAB tool based on AT for automatic beam correction and closed orbit searching. The algorithm and simulation results are presented in this paper.

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MOPIK087

Development of a Tune Knob for the HLS-II Storage Ring

storage-ring, lattice, sextupole, simulation

730

S.W. Wang, J.Y. Li, W.B. Wu, W. Xu, K. Xuan, X. Zhou
USTC/NSRL, Hefei, Anhui, People's Republic of China

A tune knob is a useful tool for lattice setup and machine studies in a storage ring. It is used to adjust the transverse tunes with a small impact on the beam dynamics. A global tune knob is designed for the Hefei Light Source (HLS). In the tune knob, the quadrupoles are grouped into four families and are symmetrically adjusted. Methodical Accelerator Design-X (MAD-X) is used to calculate the coefficients of the tune knob and the Accelerator Toolbox (AT) is used to double check the accuracy of the tune knob. The chromaticity is corrected by the sextupoles in the storage ring. This paper reports preliminary simulation results of the tune knob for HLS. The beta function deviations are also studied.

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MOPIK088

Vertical Emittance Reduction in the SSRF Phase II Project

emittance, coupling, alignment, sextupole

733

C.L. Li, B.C. Jiang, Z.B. Li, M.Z. Zhang, Q.L. Zhang, W.Z. Zhang
SINAP, Shanghai, People's Republic of China

The Shanghai Synchrotron Radiation Facility (SSRF) Phase II beamline project (SSRF Phase II) will implement the new lattice with dual-canted insertion devices, superbends and superconducting wiggler. The emittance coupling is one of the most important parameters for the high brightness storage ring light sources. It is often less than 1% in the third-generation storage ring light sources. In this paper, the sensitivity of emittance coupling to magnetic alignment errors in the SSRF Phase II is presented. Sixty skew quadrupole magnets are utilized to correct the emittance coupling with gradient descent algorithm. The emittance coupling obtained in the SSRF Phase II lattice is below 0.3%.

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MOPIK090

Beta Function Measurement in the SOLARIS Storage Ring

storage-ring, lattice, optics, sextupole

736

A. Kisiel, M.B. Jaglarz, M.P. Kopeć, S. Piela, M.J. Stankiewicz, A.I. Wawrzyniak
Solaris, Kraków, Poland

One of the most essential lattice function used for transverse beam dynamics studies of the storage rings is a beta function. It characterizes the linear properties of magnets layout and allows to optimize the compatibility of the model and the machine by reducing the beta-beating. Moreover, the calculation of other parameters like transverse beam emittance, dynamic aperture, energy spread and others, requires knowledge of the quantity of beta function along the ring. Various methods of measurement of this function used in Solaris will be presented.

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MOPIK096

Predictability of the Beam Quality During RFQ Voltage Tuning

emittance, rfq, simulation, distributed

748

A. Ponton
ESS, Lund, Sweden
A.C. France
CEA/IRFU, Gif-sur-Yvette, France

It has previously been demonstrated that certain spatial harmonics of the dipolar and quadrupolar components of the RFQ voltage have stronger effects on the beam quality than others*. The study suggested that, during the tuning process to compensate for manufacturing errors, some harmonic contents (other than the first ones) should be minimized. The analysis presented in this paper looks at how we can predict the beam quality knowing the content of each voltage harmonics. We propose also a strategy to minimize the impacts of the voltage errors on the output beam phase space during the tuning phase.
* A. Ponton, A.C. France, Y.I. Levinsen, O. Piquet, B. Pottin, and E. Sargsyan, Voltage Error Studies in the ESS RFQ, in Proc. 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 2016, paper THPMB039, pp. 3320-3323, ISBN: 978-3-95450-147-2

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MOPIK097

Vertical Dispersion and Betatron Coupling Correction for FCC-ee

emittance, sextupole, coupling, collider

752

S. Aumon, B.J. Holzer
CERN, Geneva, Switzerland
K. Oide
KEK, Ibaraki, Japan

The FCC-ee project foresees to build a 100 km e⁺/e⁻ circular collider for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 10³⁵ cm^-2s^-1. To reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2~mm at the IPs. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 1~nm for ε_x and 2~pm for ε_y, bringing down the coupling ratio to 2/1000. Thus, coupling and vertical dispersion sources have to be controlled carefully. This paper describes the tolerance of the machine to magnet alignment errors as well as the optics correction methods that were implemented, such as the Orbit Dispersion Free Steering, in order to bring the vertical dispersion to reasonable values. The correction of the betatron coupling, being also a very important source of emittance growth, has been integrated to a challenging correction scheme to keep the vertical emittance as low as possible.

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MOPIK100

Beam Delivery System Optimization for CLIC 380 GeV

luminosity, sextupole, lattice, optics

764

F. Plassard, A. Latina, E. Marín, D. Schulte, R. Tomás
CERN, Geneva, Switzerland
P. Bambade
LAL, Orsay, France

In the framework of the CLIC rebaselining, the Beam Delivery System (BDS) have been re-optimized for its initial stage at 380 GeV. Two BDS designs with L*=4.3 meters and L*=6 meters have been investigated. The optimization of the lattices and the beam parameters at the interaction point (IP) have been performed by taking into account their energy upgrade to 3 TeV and the tuning feasibility of the BDS in presence of static imperfections.

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MOPIK102

Beam Dynamics Studies of the HIE-ISOLDE Transfer Lines in the Presence of Magnetic Stray Fields

experiment, shielding, operation, solenoid

768

J. Mertens, J. Bauche, M.A. Fraser, B. Goddard, R. Ostojić, J.S. Schmidt
CERN, Geneva, Switzerland

The ISOLDE facility at CERN produces radioactive isotopes far from stability for fundamental nuclear physics research. The radioactive beams are accelerated to high-energy using a post-accelerator before being transferred for study in different experiments at the end of a network of High Energy Beam Transfer (HEBT) lines. In the framework of the HIE-ISOLDE project, the energy of post-accelerated beams is to be increased to over 10 MeV/u and new experimental detectors are being proposed for installation to exploit the new energy regime. The stray magnetic fields associated with many of the new detectors will distort the beam trajectories in the HEBT, potentially affecting the transmission of the low intensity beams delivered to the experiments. In this contribution, the influence on the HEBT of the stray field of the proposed ISOL Solenoidal Spectrometer is discussed, correction schemes described and shielding options assessed.

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MOPIK112

High Average Power Deuteron Beam Dynamics

neutron, target, emittance, diagnostics

798

R.A. Marsh, G.G. Anderson, S.G. Anderson, D.L. Bleuel, M.L. Crank, P. Fitsos, D.J. Gibson, M. Hall, M.S. Johnson, B. Rusnak, J.D. Sain, R. Souza, A. Wiedrick
LLNL, Livermore, California, USA

Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344
Lawrence Livermore National Lab (LLNL) is developing an intense, high-brightness fast neutron source to create sub-mm-scale resolution neutron radiographs and images. A pulsed 7MeV, 300μA average-current commercial deuteron accelerator will produce an intense source (10¹¹ n/s/sr at 0 deg) of fast neutrons (10MeV) using a novel neutron target with a small (1.5mm diameter) beam spot size to achieve high resolution. A highly flexible multi-accelerator beamline has been developed allowing for the use of both 4MeV and 7MeV RFQ/DTL deuteron accelerators. TRACE3D has been used to model the beam transport and design the quadrupole lattice and results will be presented including iterated design within beamline mechanical constraints, sensitivities, and multiple use of the magnets. Because of the high power density of such a tightly focused, modest-energy ion beam, intercepting beam diagnostics are extremely challenging, motivating novel concepts and extensions of current techniques to higher average power densities. Full duty factor beamline diagnostics will be discussed including charge, position, emittance via beam-induced fluorescence, and a full power beam dump and Faraday cup.

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MOPIK119

Beam Dynamics in g-2 Storage Ring

storage-ring, resonance, experiment, dipole

817

W. Wu, B. Quinn
UMiss, University, Mississippi, USA

The muon anomalous magnetic moment has played an important role in constraining physics beyond the Standard Model. The Fermilab Muon g-2 Experiment has a goal to measure it to unprecedented precision: 0.14 ppm. To achieve this goal, we must understand the beam dynamics systematic effects in the muon storage ring. We will present the muon beam dynamics and discuss two specific topics here: the beam resonance which is related to the muon loss and the fast rotation analysis to determine the muon momentum distribution.

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MOPIK122

The Beam Optics of the FFAG Cell of the CBETA ERL Accelerator

electron, optics, dipole, focusing

820

N. Tsoupas, J.S. Berg, S.J. Brooks, G.J. Mahler, F. Méot, V. Ptitsyn, D. Trbojevic
BNL, Upton, Long Island, New York, USA
J.A. Crittenden
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
S.C. Tygier
UMAN, Manchester, United Kingdom

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The CBETA project[*] is a prototype electron accelerator for the proposed eRHIC project[**]. The electron accelerator is based on the Energy Recovery Linac (ERL) and the Fixed Field Alternating Gradient (FFAG) principles. The FFAG arcs and the straight section of the accelerator are comprised of one focusing and one defocusing quadrupoles which are designed as Halbach-type permanent dipole magnets with quadrupoles component[***]. We will present the beam optics of the FFAG cell which is based on 3D field maps derived with the use of the OPERA computer code[****]. We will also present the electromagnetic design of the corrector magnets of the cell.
* http://arxiv.org/abs/1504.00588
** http://arxiv.org/ftp/arxiv/papers/1409/1409.1633.pdf
*** K. Halbach, Nucl. Instrum. Meth. 169 (1980) pp. 1-10
**** http://www.scientificcomputing.com

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MOPIK123

Beam Dynamics Numerical Studies Regarding CBETA Cornell-BNL ERL

lattice, multipole, simulation, optics

824

F. Méot, S.J. Brooks, D. Trbojevic, N. Tsoupas
BNL, Upton, Long Island, New York, USA
S.C. Tygier
UMAN, Manchester, United Kingdom

Funding: Work supported by New York State Energy Research and Development Authority (NYSERDA)
The Cornell-BNL Electron Test Accelerator CBETA is based on a 36 MeV superconducting linac and on a single 4-pass up/4-pass down linear FFAG return loop, for beam acceleration from 6 to 150 MeV and energy recovery. Numerical beam dynamics simulations have accompanied and eventually validated the quadrupole-doublet FFAG cell technology and parameters, and following that the complete return loop, all along the ERL lattice design process. They are key to assessing and validating the ERL optics and beam behavior over the whole acceleration/ER cycle, and in preparing future machine operation. This paper presents various of these beam dynamics studies, including start-to-end simulations.

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MOPIK125

Multi-frequency AC LOCO: A Fast and Precise Technique for Lattice Correction

lattice, optics, power-supply, experiment

831

X. Yang, K. Ha, V.V. Smaluk, Y. Tian, L. Yu
BNL, Upton, Long Island, New York, USA

We developed a novel technique to improve the precision and shorten the measurement time of the LOCO (Linear Optics from Closed Orbits) method at NSLS-II [1]. This technique named AC LOCO is based on a sine-wave (AC) beam excitation via fast correctors typically installed at synchrotron light sources for the fast orbit feedback. The beam oscillations are measured by beam position monitors. The narrow band used for the beam excitation and measurement not only allows us to suppress effectively the beam position noise and also makes simultaneously exciting multiple correctors at different frequencies (multi-frequency mode) possible. We demonstrated at NSLS-II that the new technique provides better lattice corrections and achieves two minutes measurement time in the thirty-frequency mode.
[1] X. Yang et al., 'Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors', Phys. Rev. Accel. Beams, vol. 20, p. 054001, 2017.

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MOPVA034

A Compact EUV Light Source Using a mm-Wave Undulator

undulator, electron, gun, impedance

928

F. Toufexis, V.A. Dolgashev, C. Limborg-Deprey, S.G. Tantawi
SLAC, Menlo Park, California, USA

Funding: This project was funded by U.S. Department of Energy under Contract No. DE-AC02-76SF00515, and the National Science Foundation under Contract No. PHY-1415437.
We are building an Extreme Ultra Violet (EUV) light source based on a 1.75 mm period RF undulator*. We will use a thermionic X-Band injector which utilizes RF bunch compression. The beam is accelerated using an X-Band traveling wave accelerating structure followed by a high shunt impedance standing wave accelerating structure up to 129 MeV. The beam then goes through a 91.392 GHz RF undulator with a period of 1.75 mm, producing EUV radiation around 13.5 nm. The RF undulator is powered by a 91.392 GHz decelerating structure, which extracts the RF power from the spent electron beam. The length of the entire beam line from the cathode to the beam dump is approximately 6 m. We describe the design and projected operating parameters for this EUV light source.
* F. Toufexis and S.G. Tantawi, A 1.75 mm Period RF-Driven Undulator, these proceedings.

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TUYA1

Linac4: From Initial Design to Final Commissioning

linac, proton, emittance, DTL

1217

A.M. Lombardi
CERN, Geneva, Switzerland

This talk reviews the design, construction, and commissioning effort of CERN's new proton linear accelerator, Linac4, which has recently been commissioned and which is presently undergoing a reliability run. Linac4 will be connected to the LHC proton injector chain during the next long LHC shut down (LS2) and will then replace the ageing Linac2.

Slides TUYA1 [30.159 MB]

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TUOBA1

Beam Commissioning Results of the CSNS Linac

DTL, linac, rfq, cavity

1223

J. Peng, Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, S. Wang, S.Y. Xu, Y. Yuan
IHEP, Beijing, People's Republic of China
M.T. Li, Y.D. Liu
CSNS, Guangdong Province, People's Republic of China

The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW pro-ton beam to a solid metal target for neutron scattering research. It consists of a 50keV H⁻ Ion Source, a 3MeV Radio Frequency Quadrupole (RFQ), an 80MeV Drift Tube Linac (DTL), and a 1.6GeV Rapid-cycling Synchro-tron (RCS). The beam commissioning has been started since April 2015. The Front End and three of the four DTL tanks have been commissioned, while the last tank and the RCS will be commissioned at the autumn this year. At the end of the DTL3, beam has been accelerated to 61MeV with nearly 100% transmission, other parame-ters such as peak current, transverse emittance and beam orbit have reached the design goal. Results and status of the beam commissioning program will be presented.
*This work is supported by National Natural Science Foundation of China (11505101).
**E-mail:pengjun@ihep.ac.cn

Slides TUOBA1 [4.272 MB]

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TUZB2

Commissioning Status of High Luminosity Collider Rings for SuperKEKB

electron, solenoid, emittance, positron

1275

H. Koiso
KEK, Ibaraki, Japan

SuperKEKB project aims to obtain the world's highest luminosity of 8x10³⁵/cm/s, in order to discover new particle physics beyond the Standard Model. Key technologies for the high luminosity are nano-beam scheme at the collision point and high positron and electron stored current with low emittance, which require the significant upgrade of both the injector and the collider rings. Recently commissioning of the renewal collider rings has been performed without final focus magnets and the Belle II detector (Phase 1). This talk gives results of the Phase 1 commissioning and construction status toward the first beam collisions (Phase 2).

Slides TUZB2 [64.509 MB]

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TUOCB1

Progress in the Design of Beam Optics for FCC-ee Collider Ring*

collider, optics, sextupole, emittance

1281

K. Oide, K. Ohmi
KEK, Ibaraki, Japan
M. Benedikt, H. Burkhardt, B.J. Holzer, A. Milanese, J. Wenninger, F. Zimmermann
CERN, Geneva, Switzerland
A.P. Blondel, M. Koratzinos
DPNC, Genève, Switzerland
A.V. Bogomyagkov, E.B. Levichev, D.N. Shatilov
BINP SB RAS, Novosibirsk, Russia
M. Boscolo
INFN/LNF, Frascati (Roma), Italy

The beam optics for the FCC-ee collider has been updated: (a) the layout is adjusted to a new footprint of FCC-hh, (b) the design around the interaction point is refined considering a number of machine-detecor interface issues, (c) the arc lattice is refined taking realistic magnet designs into account, (d) the β^* and betatron tunes are re-optimized according to recent results of the beam-beam simulations, and more. These changes make the collider design more realistic without performance degradation.

Slides TUOCB1 [4.891 MB]

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TUPAB001

Proof of Concept of CLIC Final Focus Quadrupoles Stabilization

controls, simulation, collider, ground-motion

1290

G. Balik, B. Aimard, L. Brunetti
IN2P3-LAPP, Annecy-le-Vieux, France
B. Caron
SYMME, Annecy-le-Vieux, France

The Compact LInear Collider (CLIC) [1] luminosity requires extremely low beam emittances. Therefore, high beam position stability is needed to provide cen-tral collisions of the opposing bunches. Since ground motion (GM) amplitudes are likely to be larger than the required tolerances, an Active Vibration Control (AVC) system is required to damp quadrupole motion to the desired value of 0.2 nm RMS at 4 Hz. This paper focuses on the vertical final focus quadrupoles (QD0, QF1) stabilization and demonstrates its feasibility. An AVC system to be installed under QD0 and QF1 has been developed and successfully tested at LAPP. Based on a dedicated homemade sensor with an ex-tremely low internal noise level of 0.05 nm at 4 Hz, it damps GM in the frequency range [3;70] Hz by up to 30 dB, leading to RMS values of approximately 0.25 nm at 4 Hz. Simulations based on GM measured in the Compact Muon Solenoid (CMS) experimental hall [2] show that with such a GM level, the specifications would only be achieved with a Passive Insulation (PI) system, which would filter ground motion starting at ~ 25 Hz

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TUPAB005

Investigation of Beam Variation and Emittance Growth Simulation With Both Misalignments and the Beam Jitter for SuperKEKB Injector Linac

emittance, linac, electron, simulation

1304

Y. Seimiya, K. Furukawa, T. Higo, F. Miyahara, M. Satoh, T. Suwada
KEK, Ibaraki, Japan

Funding: This work was supported by JSPS KAKENHI Grant Number 16K17545.
The SuperKEKB is e⁺/e⁻ circular collider for high luminosity, 8Â¥times10³⁵ as a target value. For the high luminosity, the injector linac is required to transport low emittance high-charged electron beam and positron beam to the ring. A charged beam with an offset from a center of cavity is affected by the wakefield depending on both the offset size in the cavity and longitudinal particle position in the beam. The wakefield causes emittance growth. This growth can be suppressed by appropriate orbit control so as to cancel the wakefield effect of the cavities in total. On the other hands, the beam variation in 6-dimensional phase space also induces the emittance growth. Emittance growth by both misalignments and 6-dimensional beam jitter was evaluated by particle tracking simulation. Investigation of beam jitter and drift was also performed by correlation analysis between beam position and measured parameter, charge or temperature.

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TUPAB008

CEPC Linac Design and Beam Dynamics

positron, linac, electron, target

1315

C. Meng, Y.L. Chi, X.P. Li, G. Pei, S. Pei, D. Wang, J.R. Zhang
IHEP, Beijing, People's Republic of China

Circular Electron-Positron Collider (CEPC) is a 100 km ring e⁺ e⁻ collider for a Higgs factory, which is organized and led by the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences (CAS) in collaboration with a number of institutions from various countries. The linac of CEPC is a normal con-ducting S-band linac with frequency in 2856.75 MHz and provide electron and positron beam at an energy up to 10 GeV with bunch charge in 1.0 nC and repetition frequency in 100 Hz. The linac scheme will be detailed discussed in this paper, including electron bunching system, positron source design, and main linac. Positrons are generated using a 4 GeV electron beam with bunch charge 10 nC hit tungsten target and the positron source design are presented. The beam dynamic results with longitudinal short Wakefield, transverse Wakefield and errors are presented.

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TUPAB018

Initial Data From an Electron Cloud Detector in a Quadrupole Magnet at CesrTA

electron, detector, positron, storage-ring

1352

J.P. Sikora, S.T. Barrett, M.G. Billing, J.A. Crittenden, K.A. Jones, Y. Li, T.I. O'Connell
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: This work is supported by the US National Science Foundation PHY-0734867, PHY-1002467 and the US Department of Energy DE-FC02-08ER41538, DE-SC0006505
In September 2016, we installed a detector in a quadrupole magnet that measures the electron cloud density using two independent techniques. Stripline electrodes collect cloud electrons which pass through holes in the beam-pipe wall. The array of small holes shields the striplines from the beam-induced electromagnetic pulse. The beam-pipe chamber has also been designed so that microwave measurements of the electron cloud density can be performed. The resonant microwaves are confined to be within the 56 cm length of the quadrupole. The detector is placed in a newly installed quadrupole that is adjacent to an existing lattice quadrupole of the same polarity. Since they are powered independently, their relative strengths can be varied with stored beam – allowing electron cloud measurements to be made as a function of gradient. This paper presents the first data obtained with this detector with trains of positron bunches at 5.3 GeV. The detector is installed in the Cornell Electron Storage Ring and is part of the test accelerator program for the study of electron cloud build-up using electron and positron beams from 2 to 5 GeV.

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TUPAB063

High Energy Transport Line Design for the HEPS Project

injection, booster, storage-ring, extraction

1466

Y.Y. Guo, Z. Duan, Y. Jiao, Y.M. Peng, G. Xu
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS), a kilometer-scale storage ring light source with the energy of 6GeV is to be built in China. For the injection scheme of the stor-age ring, on-axis injection is the baseline scheme. To simultaneously accommodate on-axis accumulation and swap-out injection schemes, we designed two high energy transport lines. In this paper we will report the detailed design of these two transport lines, including the layout and lattice design.

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TUPAB075

Compact High Energy Electron Radiography System Based on Permanent Magnet Quadrupole

electron, target, experiment, permanent-magnet

1494

Z. Zhou, Y.-C. Du, W. Gai, W.-H. Huang, F. Li, T. Rui, C.-X. Tang
TUB, Beijing, People's Republic of China
W. Gai
ANL, Argonne, Illinois, USA

High energy electron radiography(HEER) is a promising diagnostic method for High Energy Density Physics (HEDP) or Inertial Confinement Fusion (ICF) owing to its capability of picosecond-nanometer spatio-temporal resolution, and is cost-effective in the meantime. A Compact HEER (CHEER) system based on Permanent Magnet Quadrupoles (PMQ) instead of conventional electromagnetic quadrupole is proposed. Its lattice design and beam optics optimization is finished, and experiment is to be carried out on Tsinghua Thomson X-ray source (TTX) beamline after PMQs fabrication and installation.

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TUPAB084

Beam Stability Modeling and Jitter Control for SXFEL Linac

linac, FEL, controls, klystron

1513

M. Zhang, R.B. Deng, D. Gu, Q. Gu, D. Huang, Z. Wang
SINAP, Shanghai, People's Republic of China

FEL operations foresee stringent requirements for the stability of the global linac output parameters and this requirement is particularly stringent for the successful operation of an externally seeded FEL. In order to understand the sensitivity of these parameters to jitters of various error sources along the SXFEL linac, studies have been performed based on analytical methods and tracking code simulations. Using the tolerance budget as guidance, beam jitter control techniques are discussed on the view of the beam dynamics.

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TUPAB094

Emittance Improvements in the MAX IV Photocathode Injector

emittance, linac, gun, laser

1533

J. Andersson, F. Curbis, M. Kotur, F. Lindau, S. Thorin, S. Werin
MAX IV Laboratory, Lund University, Lund, Sweden

The MAX IV injector design predicts a beam with 100 pC of charge and an emittance lower than 1 mm mrad. The photocathode pre-injector is based on the now close to standard 1.6-cell gun adapted to 2.9985 GHz, in combination with a Ti:Sapphire laser system. This system reaches the requirements of the injector operation for the SPF, but can be tuned beyond specifications to open up new operation modes. During 2016 and 2017 several aspects where investigated to improve the emittance from the current gun, the goal was to meet the SPF specifications. In this paper we report on the progress, discuss the steps taken leading to a final emittance of ~ 1 mm mrad and beyond.

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TUPAB133

Perturbation Analysis for Beam Trajectories. Determining Local Shielding Containment for LCLS-II

shielding, simulation, dipole, undulator

1637

M. Santana-Leitner
SLAC, Menlo Park, California, USA

Funding: Work supported by U.S. Department of Energy contract DE-AC02-76SF00515
Containment of beam losses by halo and momentum/energy collimators is a well-established practice for normal operation of particle accelerators where tracking codes are applied. However, for exceptional events, such as magnet power failures, severe lattice mis-match, etc., ad-hoc analytical approaches are typically applied. Oftentimes those simplified methods are not automatic; they don't define the full phase-space of mis-steered trajectories and cannot keep up with beam-line upgrades. Moreover, there may exist a disconnect between the teams analyzing consequences of errant beams and those involved in beam-line design. With electron beams exceeding 100 kW, design of LCLS-II at SLAC National Accelerator Laboratory required exhaustive beam-containment studies to avoid potential destruction of components and excessive dose rates. The geometry of the different beam-lines and the nominal optics was built with MadFLUKA [1], and FLUKA [2] Monte Carlo code along with perturbations to magnetic fields was used to inspect failures compatible with beam operations and hardware settings. Consequences of mis-steered rays and the respective mitigations were directly analyzed with FLUKA.
[1] M. Santana-Leitner et al., MadFLUKA Beam Line 3D Builder. Simulation of Beam Loss Propagation in Accelerators, IPAC14 proceedings, MOPME040
[2] A. Ferrari et al, The FLUKA Code: Developments and Challenges for High Energy and Medical Applications, Nuclear Data Sheets 120, 211-214 (2014)

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TUPIK014

Detailed Analysis of a Linear Beam Transport Line from a Laser Wakefield Accelerator to a Transverse-Gradient Undulator

multipole, beam-transport, alignment, simulation

1711

A. Will, A. Bernhard, A.-S. Müller, C. Widmann
KIT, Karlsruhe, Germany
M. Kaluza
HIJ, Jena, Germany
M. Kaluza
IOQ, Jena, Germany

A linear beam transport system, experimentally tested at the Laser Wakefield Accelerator in Jena, Germany, has been carefully analyzed in order to gain a deeper understanding of the experimental results and to develop experimental strategies for the future. This analysis encompassed a detailed characterization of the focusing magnets and an investigation of the effects of source parameters as well as magnet and alignment errors on the observables accessible in the experiment. A dedicated tracking tool was developed for these investigations. In this contribution we review the main results of these studies.

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TUPIK037

Proton Cross-Talk and Losses in the Dispersion Suppressor Regions at the FCC-hh

proton, simulation, collimation, luminosity

1763

H. Rafique, R.B. Appleby
UMAN, Manchester, United Kingdom
J.L. Abelleira
JAI, Oxford, United Kingdom
A.M. Krainer, A. Langner
CERN, Geneva, Switzerland

Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol), EU's Horizon 2020 grant No 654305
Protons that collide at the interaction points of the FCC-hh may contribute to the background in the subsequent detector. Due to the high luminosity of the proton beams this may be of concern. Using DPMJET-III to model 50 TeV proton-proton collisions, tracking studies have been performed with PTC and MERLIN in order to gauge the elastic and inelastic proton cross-talk. High arc losses, particularly in the dispersion suppressor regions, have been revealed. These losses originate mainly from particles with a momentum deviation, either from interaction with a primary collimator in the betatron cleaning insertion, or from the proton-proton collisions. This issue can be mitigated by introducing additional collimators in the dispersion suppressor region. The specific design, lattice integration, and the effect of these collimators on cross-talk is assessed.

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TUPIK077

Main Achievements of the PACMAN Project for the Alignment at Micrometric Scale of Accelerator Components

alignment, target, collider, feedback

1872

H. Mainaud Durand, K. Artoos, M.C.L. Buzio, D. Caiazza, N. Catalán Lasheras, A. Cherif, I.P. Doytchinov, J.-F. Fuchs, A. Gaddi, N. Galindo Munoz, J. Gayde, S.W. Kamugasa, M. Modena, P. Novotny, S. Russenschuck, C. Sanz, G. Severino, D. Tshilumba, V. Vlachakis, M. Wendt, S. Zorzetti
CERN, Geneva, Switzerland
A. Faus-Golfe
LAL, Orsay, France

Funding: The research leading to these results has received funding from the European Union's 7th Framework Programme Marie Curie actions, grant agreement PITN-GA-2013-606839.
The objectives of the PACMAN* project are to improve the precision and accuracy of the alignment of accelerator components. Two steps of alignment are concerned: the fiducialisation, i.e. the determination of the reference axis of components w.r.t alignment targets, and the initial alignment of components on a common support assembly. The main accelerator components considered for the study are quadrupoles, 15 GHz BPM and RF structures from the Compact LInear Collider (CLIC) project. Different methods have been developed to determine the reference axis of these components with a micrometric accuracy, as well as to determine the position of this reference axis in the coordinate frame of the common support assembly. The tools and methods developed have been validated with success on dedicated test setups using CLIC components. This paper will provide a compilation of the main achievements and results obtained.
* PACMAN is an acronym for a study on Particle Accelerator Components' Metrology and Alignment to the Nanometre scale.

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TUPIK085

HL-LHC Alignment Requirements and Associated Solutions

alignment, target, vacuum, monitoring

1893

H. Mainaud Durand, S. Bartolome-Jimenez, T. Dijoud, A. Herty, M. Sosin
CERN, Geneva, Switzerland
M. Duquenne, V. Rude
ESGT-CNAM, Le Mans, France

To increase by more than 10 times the luminosity reach w.r.t the first 10 years of the LHC lifetime, the HL-LHC project will replace nearly 1.2 km of the accelerator during the Long Shutdown 3 scheduled in 2024 [1][2][3]. This paper presents the HL-LHC alignment and internal metrology requirements of all the new components to be installed, from the magnet components to the beam instrumentation and vacuum devices. As for the LHC, a combination of Hydrostatic Levelling Sensors (HLS) and Wire Positioning Sensors (WPS) is proposed for the alignment of the main components, but on a longer distance (210 m instead of 50 m), generating technical challenges for the installation of the stretched wire and for the maintenance of the alignment systems. Innovative measurements methods and instrumentation are under study to perform the position monitoring inside a cryostat of cold masses and crab cavities, in a cold (2K) and radioactive (1 MGy/year) environment, as well as to carry remote measurements in the tunnel of the intermediary components. The proposed solutions concerning the determination of the position and the re-adjustment of the components are detailed in this paper.

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TUPIK087

Phase Advance Interlocking Throughout the Whole LHC Cycle

optics, kicker, software, operation

1901

K. Fuchsberger, A. Calia, M.A. Galilée, G.H. Hemelsoet, M. Hostettler, D. Jacquet, J. Makai, M. Schaumann
CERN, Geneva, Switzerland

Each beam of CERN's Large Hadron Collider (LHC) stores 360 MJ at design energy and design intensity. In the unlikely event of an asynchronous beam dump, not all particles would be extracted immediately. They would still take one turn around the ring, oscillating with potentially high amplitudes. In case the beam would hit one of the experimental detectors or the collimators close to the interaction points, severe damage could occur. In order to minimize the risk during such a scenario, a new interlock system was put in place in 2016. This system guarantees a phase advance of zero degrees (within tolerances) between the extraction kicker and the interaction point. This contribution describes the motivation for this new system as well as the technical implementation and the strategies used to derive appropriate tolerances to allow sufficient protection without risking false beam dump triggers.

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TUPIK097

Improving the Performance of an Orbit Feed-forward Based on Quadrupole Motion at the KEK ATF

kicker, feedback, ground-motion, collider

1931

D.R. Bett, C. Charrondière, M. Patecki, J. Pfingstner, D. Schulte, R. Tomás
CERN, Geneva, Switzerland
P. Burrows, G.B. Christian, C. Perry
JAI, Oxford, United Kingdom
A. Jeremie
IN2P3-LAPP, Annecy-le-Vieux, France
K. Kubo, S. Kuroda, T. Naito, T. Okugi, T.T. Tauchi, N. Terunuma
KEK, Ibaraki, Japan

The high luminosity requirement for a future linear collider sets a demanding limit on the beam quality at the Interation Point (IP). Even the natural motion of the ground could misalign the quadrupole magnets to such an extent that the resulting dipole kicks would require compensation. The novel technique described in this paper uses seismometers to measure the positions of the quadrupole magnets in real time and a kicker to counteract the effect of their misalignment. The prototype system deployed at the Accelerator Test Facility (ATF) at KEK in Japan has already demonstrated a reduction in the pulse-to-pulse vertical position jitter of the beam by about 10%. Based on the observed correlation of the beam position to the quadrupole positions the maximum possible jitter reduction from such a system is estimated to be about 25%. This paper details the latest improvements made to the system with the aim of achieving this limit.

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TUPIK099

Beam-Based Alignment for the Rebaselining of CLIC RTML

emittance, sextupole, coupling, alignment

1939

Y. Han, L. Ma
SDU, Shandong, People's Republic of China
A. Latina, D. Schulte
CERN, Geneva, Switzerland

The first stage of the CLIC is proposed to be at 380 GeV. So the Ring To Main Linac (RTML), which transport the beams from the damping ring to main linac with minimal emittance growth, should be restudied due to the new beam properties. In this paper the two bunch compressors in the RTML are redesigned. Then a complete study of the static beam-based alignment techniques along RTML is presented. The beam-based correction includes one-to-one and dispersion-free steering, then a global correction using tuning bumps is applied to reduce the final emittance and mitigate the effects of coupling. The results showed that the emittance growth budgets can be met both in the horizontal and vertical planes.

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TUPIK100

Methodology Applied for Dependability Studies on the Compact Linear Collider

simulation, operation, linac, collider

1943

O. Rey Orozko, A. Apollonio, M. Jonker
CERN, Geneva, Switzerland

The Compact Linear Collider (CLIC) scheme presents several challenges in terms of reliability and availability. The goal of the study is to demonstrate the requirements for availability and reliability by identifying the key factors on failure effects and analysing possible operational scenarios and designs. Hence, a good knowledge on CLIC system structures, failure modes and failure effects is needed. This paper reports about the set-up of the studies from the definition of the CLIC failure catalogue to the implementation of the models and analysis of the results. It will present in detail the steps that need to be followed when performing such a study. Finally, the CLIC Drive Beam Quadrupoles powering system will be presented as a use-case.

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TUPIK108

Beam Based Alignment Studies for the CLARA FEL Test Facility

FEL, alignment, undulator, cavity

1971

J.K. Jones, N. Thompson
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

The CLARA (Compact Linear Accelerator for Research and Applications) test facility is designed to experimentally demonstrate innovative FEL schemes for future light source applications. Such schemes can place strict requirements on the accelerator beam properties as well as the relative alignment of the beam in the FEL radiators and modulators. Beam-based alignment (BBA) of the FEL section is therefore an operational requirement for all advanced FEL facilities. In this paper we demonstrate results of CLARA BBA simulations, and also report initial simulation results from the use of non-linear algorithms to optimise the FEL performance directly.

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TUPIK130

A Permanent Magnet Quadrupole Magnet for CBETA

permanent-magnet, dipole, lattice, electron

2016

H. Witte, J.S. Berg, J. Cintorino, G.J. Mahler, N. Tsoupas, P. Wanderer
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Recently a collaboration between Brookhaven National Laboratory and Cornell University was established, aiming to build the CBETA accelerator. CBETA is a 150 MeV electron test accelerator, which prototypes essential technologies of eRHIC, which is a proposed upgrade to the existing Relativistic Heavy Ion Collider (RHIC) hadron facility at Brookhaven National Laboratory. Similar to eRHIC, CBETA employs an FFAG lattice for the arcs. The arcs require short, large aperture quadrupole magnets, which are located close together. BNL has been working on a design employing permanent magnets; we show the concept and the engineering design of these magnets. Prototype magnets have been constructed recently; we report on magnetic field quality measurements and their agreement with computer simulations.

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TUPVA001

Progress on the Optics Corrections of FCC-hh

dipole, injection, coupling, lattice

2019

D. Boutin, A. Chancé, B. Dalena
CEA/IRFU, Gif-sur-Yvette, France
B.J. Holzer, D. Schulte
CERN, Geneva, Switzerland

The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the three options considered for the next generation accelerator in high-energy physics as recommended by the European Strategy Group, and the natural evolution of existing LHC. Studies are ongoing about the evaluation of the various magnets mechanical errors and field errors tolerances in the arc sections of FCC-hh, as well as an estimation of the correctors strengths necessary to perform the corrections of the errors. In this study advanced correction schemes for the residual orbit, the linear coupling and the ring tune are described. The impact of magnet tolerances on the residual errors, on the correctors technological choice and on the beam screen design are discussed. In particular the effect of the dipole a2 error is emphasized.

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TUPVA002

Updates on the Optics of the Future Hadron-Hadron Collider FCC-hh

dipole, optics, sextupole, hadron

2023

A. Chancé, D. Boutin, B. Dalena
CEA/IRFU, Gif-sur-Yvette, France
B.J. Holzer, A. Langner, D. Schulte
CERN, Geneva, Switzerland

Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol) project has received funding from the European Union's Horizon 2020 research and innovation programme under grant No 654305.
The FCC-hh (Future Hadron-Hadron Circular Collider) is one of the three options considered for the next generation accelerator in high-energy physics as recommended by the European Strategy Group. The layout of FCC-hh has been optimized to a more compact design following recommendations from civil engineering aspects. The updates on the first order and second order optics of the ring will be shown for collisions at the required centre-of-mass energy of 100 TeV. Special emphasis is put on the dispersion suppressors and general beam cleaning sections as well as first considerations of injection and extraction sections.

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TUPVA016

Identification and Analysis of Prompt Dose Maxima in the Insertion Regions IR1 and IR5 of the Large Hadron Collider

radiation, luminosity, operation, dipole

2078

O. Stein, M. Brugger, S. Danzeca, R. Garcia Alia, Y. Kadi, M. Kastriotou, C. Martinella, C. Xu
CERN, Geneva, Switzerland

During the operation of the LHC the continuous particle losses create a radiation field in the LHC tunnel and the adjacent caverns. Exposed electronics and accelerator components show dose dependent accelerated aging effects and stochastic Single Event Effects which can lead to faults and downtime of the LHC. In order to achieve an optimal life duration, the position of the equipment is chosen in dependency of the amplitude of the radiation fields. Therefore, it is crucial to monitor the prompt dose distributions along the whole LHC. By using the LHC beam loss monitor and RadMon systems, the prompt dose during the accelerator operation is continuously monitored. Measurements in the long straight sections and the dispersion suppressors in IR1 (ATLAS) and in IR5 (CMS) have shown that the radiation levels have localised maxima which exceed the base line by 1 to 2 orders of magnitude. The analysis of these radiation peaks will be presented and the underlying loss mechanisms will be discussed. The results will help to identify areas not suitable for radiation sensitive electronics. Implications on the expected radiation levels for High-Luminosity LHC are also discussed.

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TUPVA018

Macroparticle Simulation Studies of the LHC Beam Dynamics in the Presence of Electron Cloud

simulation, electron, dipole, octupole

2081

A. Romano, G. Iadarola, K.S.B. Li, G. Rumolo
CERN, Geneva, Switzerland

Beam quality degradation caused by the Electron Cloud (EC) effects has been identified as one of the main performance limitations for the high intensity 25 ns beams in the Large Hadron Collider (LHC). When a proton bunch passes through an EC, electrons are attracted towards the transverse center of the beam resulting into an increasing electron density within the bunch. The effects driven by the interaction of the electrons with the bunch have been studied with macroparticle simulations in order to evaluate, in different operational scenarios, the threshold for the coherent instabilities as well as the incoherent tune spread. This contribution will summarize the main findings of the simulation study and compare them with the available experimental observations.

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TUPVA023

Effect of Quench Heater and CLIQ Firing on the Circulating HL-LHC Beam

dipole, simulation, collimation, superconducting-magnet

2101

M. Valette, L. Bortot, A.M. Fernandez Navarro, B. Lindstrom, R. Schmidt, A.P. Verweij, D. Wollmann
CERN, Geneva, Switzerland

Funding: Research supported by the HL-LHC project.
A small vertical orbit oscillation of the LHC beam was observed following a quench of a main dipole magnet. This effect was thought to be caused by the current dis-charged in the quench heater (QH) strips of the superconducting magnet and confirmed in dedicated experiments with beam in the LHC. Quench heater connection schemes with the largest effect have been identified for the LHC and its future HiLumi upgrade (HL-LHC). Furthermore, the impact on the beam following discharges of the Coupling-Loss Induced Quench (CLIQ) system, a novel technology to protect high current superconducting magnets in case of a quench, was studied to evaluate the possible failure cases.

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TUPVA037

FCC-hh Final-Focus for Flat-Beams: Parameters and Energy Deposition Studies

optics, luminosity, collider, hadron

2139

J.L. Abelleira, E. Cruz Alaniz, A. Seryi, L. van Riesen-Haupt
JAI, Oxford, United Kingdom
M.I. Besana
CERN, Geneva, Switzerland

Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol), EU's Horizon 2020 grant No 654305.
The international Future Circular Collider (FCC) study comprises the study of a new scientific structure in a tunnel of 100 km. This will allow the installation of two accelerators, a 45.6'175 GeV lepton collider and a 100-TeV hadron collider. An optimized design of a final-focus system for the hadron collider is presented here. The new design is more compact and enables unequal β^* in both planes, whose choice is justified here. This is followed by energy deposition studies, where the total dose in the magnets as a consequence of the collision debris is evaluated.

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TUPVA038

Non Linear Field Correction Effects on the Dynamic Aperture of the FCC-hh

lattice, collider, interaction-region, dynamic-aperture

2143

E. Cruz Alaniz, A. Seryi
JAI, Oxford, United Kingdom
E.H. Maclean, R. Martin, R. Tomás
CERN, Geneva, Switzerland

Funding: European Union's Horizon 2020 research and innovation programme under grant No 654305.
The Future Circular Collider (FCC) design study aims to develop the designs of possible circular colliders in the post LHC era. In particular the FCC-hh will aim to produce proton-proton collisions at a center of mass energy of 100 TeV. Given the large beta functions and integrated length of the quadrupoles of the final focus triplet the effect of systematic and random non linear errors in the magnets are expected to have a severe impact on the stability of the beam. Following the experience on the HL-LHC this work explores the implementation of non-linear correctors to minimize the resonance driving terms arising from the errors of the triplet. Dynamic aperture studies are then performed to study the impact of this correction.

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TUPVA039

Effect of Alignment Errors and Orbit Correctors on the Interaction Region of the FCC-hh

interaction-region, optics, dipole, collider

2147

E. Cruz Alaniz, J.L. Abelleira, A. Seryi, L. van Riesen-Haupt
JAI, Oxford, United Kingdom
J.L. Abelleira, L. van Riesen-Haupt
University of Oxford, Oxford, United Kingdom

Funding: European Union's Horizon 2020 research and innovation programme under grant No 654305.
The Future Circular Collider (FCC) design study aims to develop the design of possible circular colliders in the LHC era. In particular the FCC-hh will aim to produce proton-proton collisions at a center of mass energy of 100 TeV. The interaction region has been designed to meet the requirements in terms of energy and luminosity. However, as it is the case in any real accelerator, misalignments in the magnets are likely to occur; the effect of these misalignments, if not properly compensated for, can jeopardize the performance of the machine. This study contemplates alignment and field errors in the interaction region in order to estimate the tolerance necessary to provide a good correction measured in terms of deviation of the orbit and strength of the correctors.

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TUPVA041

Exploring the Triplet Parameter Space to Optimise the Final Focus of the FCC-hh

optics, shielding, target, radiation

2155

L. van Riesen-Haupt, J.L. Abelleira, E. Cruz Alaniz, A. Seryi
JAI, Oxford, United Kingdom

One of the main challenges when designing final focus systems of particle accelerators is maximising the beam stay clear in the strong quadrupole magnets of the inner triplet. Moreover it is desirable to keep the quadrupoles in the inner triplet as short as possible for space and costs reasons but also to reduce chromaticity and simplify corrections schemes. An algorithm that explores the triplet parameter space to optimise both these aspects was written. It uses thin lenses as a first approximation and MADX for more precise calculations. In cooperation with radiation studies, this algorithm was then applied to design an alternative triplet for the final focus of the Future Circular Collider.

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TUPVA042

K-Modulation Developments via Simultaneous Beam Based Alignment in the LHC

optics, sextupole, closed-orbit, simulation

2159

L. van Riesen-Haupt, A. Seryi
JAI, Oxford, United Kingdom
J.M. Coello de Portugal, E. Fol, R. Tomás, R. Tomás
CERN, Geneva, Switzerland

Funding: EuroCirCol
A parasitic effect of k-modulation is that if the modulated quadrupole has an offset the modulation results in a dipole like kick forcing the beam on a new orbit. This paper presents a new method using the orthonormality of singular value decomposition that uses this new orbit to estimate the offset. This could be used to measure misalignments or crossing angles but could also help improve k-modulation \beta measurements by predicting the parasitic tune change caused by the new orbit not passing through the centre of the sextupoles.

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TUPVA043

A Code for Optimising Triplet Layout

collider, shielding, focusing, proton

2163

L. van Riesen-Haupt, J.L. Abelleira, E. Cruz Alaniz, A. Seryi
JAI, Oxford, United Kingdom

Funding: EuroCirCol
One of the main challenges when designing final focus systems of particle accelerators is maximising the beam stay clear in the strong quadrupole magnets of the inner triplet. Moreover it is desirable to keep the quadrupoles in the inner triplet as short as possible for space and costs reasons but also to reduce chromaticity and simplify corrections schemes. An algorithm that explores the triplet parameter space to optimise both these aspects was written. It uses thin lenses as a first approximation for a broad parameter scan and MADX for more precise calculations. The thin lens algorithm is significantly faster than a full scan using MADX and relatively precise at indicating the approximate area where the optimum solution lies.

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TUPVA051

Magnets and Wien Filters for SECAR

dipole, multipole, target, high-voltage

2191

F. Bødker, N. Hauge, J. Kristensen
Danfysik A/S, Taastrup, Denmark
G.P.A. Berg, M. Couder
University of Notre Dame, Indiana, USA
H. Schatz
NSCL, East Lansing, Michigan, USA

The Separator for Capture Reactions, SECAR, is being built at Michigan State University for the study of low-energy capture reactions. The high performance magnets and two large Wien filters required to reach the very high recoil mass separation factor are being designed and produced at Danfysik to the SECAR specifications. The 2.4 m long Wien filters with a weight of 35 ton each including a large vacuum tank have high electrode voltages of ±300 kV combined with a magnetic field of 0.12 T. Challenging design requirements for integrated magnetic and electrostatic field homogeneity combined with tight tolerance on the effective lengths have been meet. The dipole magnets for this facility are special in having stringent ±0.5 mm effective magnetic length specifications in a wide excitation range and the transverse field boundary variation is described by a 4th order polynomial. Most of the dipoles are made with variable segmented field clamps in order to keep the deviation of the magnetic fringe field boundary within the required ±0.1 mm. The wide range of different quadrupole, sextupole and octupole magnets are required to meet the specified magnetic length with a tight tolerance.

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TUPVA057

Design Study for a Prototype Alvarez-Cavity for the Upgraded Unilac

cavity, DTL, operation, ion

2205

M. Heilmann, X. Du, P. Gerhard, L. Groening, M. Kaiser, S. Mickat, A. Rubin
GSI, Darmstadt, Germany
A. Seibel
IAP, Frankfurt am Main, Germany

The design study describes the prototype Alvarez-tank of the new post-stripper of the UNILAC. A prototype with 17 drift tubes (including quadrupole singulets) of 3 m of total length and 2 m of diameter will be manufactured. This cavity features new drift tube shape profiles to provide for high shunt impedance at a maximum electric surface field of 1 Ek. Additionally, it allows realization and high power testing of an optimized stem configuration for field stabilization. In case of successful tuning and long-term operation at high power level, it shall be used as a first of series cavity of the new UNILAC post-stripper DTL.

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TUPVA060

Upgrade of GSI HADES Beamline in Preparation for High Intensity Runs

target, optics, beam-losses, dipole

2214

M. Sapinski, P. Boutachkov, S. Damjanovic, K. Dermati, C.M. Kleffner, J. Pietraszko, T. Radon, S. Ratschow, S. Reimann, W. Sturm, B. Walasek-Höhne
GSI, Darmstadt, Germany

HADES is a fixed target experiment using SIS18 heavy-ion beams. It investigates the microscopic properties of matter formed in heavy-ion, proton and pion - induced reactions in the 1-3.5 GeV/u energy regime. In 2014 HADES used a secondary pion beam produced by interaction between high-intensity nitrogen primary beam and a beryllium target. In these conditions beam losses, generated by slow extraction and beam transport to the experimental area, led to activation of the beam line elements and triggered radiation alarms. The primary beam intensity had to be reduced and the beam optics modified in order to keep radiation levels within the allowed limits. Similar beam conditions are requested by HADES experiment for upcoming run in 2018 and in the following years. Therefore, a number of measures have been proposed to improve beam transmission and quality. These measures are: additional shielding, additional beam instrumentation, modification of beam optics and increase of vacuum chambers' apertures in critical locations. The optics study and preliminary results of FLUKA simulations for optimization of location of loss detectors are presented.

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TUPVA062

Construction of the MYRRHA Injector

cavity, diagnostics, beam-diagnostic, linac

2221

D. Mäder, H. Höltermann, H. Hähnel, D. Koser, K. Kümpel, U. Ratzinger, W. Schweizer
BEVATECH, Frankfurt, Germany
C. Angulo, J. Belmans, L. Medeiros Romão, D. Vandeplassche
Studiecentrum voor Kernenergie - Centre d'Étude de l'énergie Nucléaire (SCK•CEN), Mol, Belgium
M. Busch, H. Podlech
IAP, Frankfurt am Main, Germany

A collaboration of SCK•CEN, IAP and BEVATECH GmbH is currently constructing the room temperature CH section of the 16.6 MeV CW proton injector for the MYRRHA project. The elaboration of all the construction readiness files for the construction of the accelerating cavities of the first CH section (1.5 to 5.9 MeV) is ongoing. In parallel, the planning, development and fabrication of all further components of this accelerator section is in progress, while the full study for the remaining section is under preparation. This contribution is documenting the most recent status.

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TUPVA064

Updated Cavities Design for the FAIR p-Linac

linac, cavity, proton, coupling

2227

A. Almomani, M. Busch, F.D. Dziuba, U. Ratzinger, R. Tiede
IAP, Frankfurt am Main, Germany
F.D. Dziuba, C.M. Kleffner
GSI, Darmstadt, Germany

The research program of antiproton beams for the FAIR facility requires a dedicated 68 MeV, 70 mA proton injector. This injector will consist of an RFQ followed by six room temperature Crossbar H-type CH-cavities operated at 325 MHz. The beam dynamics had been revised by IAP Frankfurt in collaboration with GSI-FAIR in Darmstadt to further optimize the design. This step was followed by cavity RF design. The detailed mechanical cavity design will begin in 2017, while the quadrupole lenses are under production already. In this paper, besides an overview the RF design of the coupled cavities with integrated focusing triplets will be a main focus.

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TUPVA067

The KONUS IH-DTL Proposal for the GSI UNILAC Poststripper Linac Replacement

linac, emittance, DTL, ion

2230

H. Hähnel, U. Ratzinger, R. Tiede
IAP, Frankfurt am Main, Germany

Funding: BMBF 05P15RFRBA
The GSI UNILAC will serve as the main injector for the upcoming FAIR project. Since the existing Alvarez DTL is in operation for more than 40 years, it has to be replaced to ensure reliable operation in the future. To this purpose a compact and efficient linac design based on IH-type cavities and KONUS beam dynamics has been designed at IAP Frankfurt*. It consists of five 10⁸ MHz IH-type cavities that can be operated by the existing UNILAC RF amplifier structure. The transversal focusing scheme is based on magnetic quadrupole triplet lenses. The optimized design provides full transmission and low emittance growth for the design current of 15 emA U²⁸⁺ accelerating the beam from 1.4 MeV/u to 11.4 MeV/u. Extensive error studies were performed to define tolerances and verify the stability of the design with respect to misalignment and injection parameters. The design provides a compact and cost efficient alternative to a new Alvarez linac. With a total length of just 22.8 meters it will leave room for future energy upgrades in the UNILAC tunnel.
* H. Hähnel, U. Ratzinger, R. Tiede, Efficient Heavy Ion Acceleration with IH-Type Cavities for High Current Machines in the Energy Range up to 11.4 MeV/u, in Proc. LINAC2016, paper TUPLR070

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TUPVA070

Dipole Compensation of the 176 MHz MYRRHA RFQ

dipole, rfq, simulation, proton

2240

K. Kümpel, H.C. Lenz, N.F. Petry, H. Podlech
IAP, Frankfurt am Main, Germany
A. Bechtold
NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
C. Zhang
GSI, Darmstadt, Germany

The MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) Project is planned as an accelerator driven system (ADS) for the transmutation of long-living radioactive waste. For this project a cw 4-Rod-RFQ with 176 MHz and a total length of about 4 m is required. It is supposed to accelerate protons from 30 keV up to 1.5 MeV*. One of the main tasks during the development of the RFQ is the very high reliability of the accelerator to limit the thermal stress inside the reactor. Another challenge was to compensate the dipole component of the MYRRHA-RFQ which is due to the design principle of 4-Rod-RFQs. This dipole component is responsible for shifting the ideal beam axis from the geometrical center of the quadrupole downwards. Design studies with CST MICROWAVE STUDIO have shown that the dipole component can be almost completely compensated by widening the stems alternately so that the current paths of the lower electrodes are increased.
* C. Zhang, H. Podlech: NEW REFERENCE DESIGN OF THE EUROPEAN ADS RFQ ACCELERATOR FOR MYRRHA. In Proceedings of IPAC'14, 3223-3225 (2014)

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TUPVA075

Beam Dynamics for a High Current 3 MeV, 325 MHz Ladder-RFQ

emittance, rfq, linac, proton

2252

M. Syha, M.A. Obermayer, U. Ratzinger, M. Schütt
IAP, Frankfurt am Main, Germany

Funding: BMBF 05P12RFRB9
After the successful measurements with a 0.8 m prototype (see Fig. 1), a 3.3 m Ladder-RFQ is under construction at IAP, Goethe University Frankfurt. It is designed to accelerate protons from 95 keV to 3 MeV according to the design parameters of the Proton Linac at FAIR. The development of an adequate beam dynamics design was done in close collaboration with the IAP resonator design team. A constant vane curvature radius and at the same time a flat voltage distribution along the RFQ was reached by implantation of the modulated vane geometry into CST Microwave Studio RF field simulations. Points of reference for the beam dynamics layout are the beam dynamics designs of C. Zhang* and A. Lombardi**. The Code RFQGen*** was used for the beam dynamics simulations. In order to increase the transmission and to reduce the longitudinal and transversal exit emittances, the evolution of the modulation parameter m within the first 90 cells was investigated in detail. This paper presents the simulation results of this study.
* Chuan Zhang, Beam Dynamics for the FAIR Proton-Linac RFQ, IPAC 2014, Dresden
** C. Rossi et al., The Radiofrequency Quadrupole Accelerator for the LINAC4, LINAC08, Victoria, BC, Canada
***L. Young, RFQGen User Guide, Los Alamos Scientific Lab., NM (USA), 2016.

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TUPVA077

The Phase Slip Factor of the Electrostatic Cryogenic Storage Ring CSR

ion, storage-ring, cryogenics, simulation

2255

M. Grieser, R. Hahn, S. Vogel, A. Wolf
MPI-K, Heidelberg, Germany

For the determination of the momentum spread of an ion beam from the measurable revolution frequency distribution the knowledge of the phase slip factor of the storage ring is necessary. At various working points of the cryogenic storage ring CSR installed at the MPI for Nuclear Physics in Heidelberg the slip factor was simulated and compared with measurements. The predicted functional relationship of the slip factor and the horizontal tune depends on the different islands of stability, which has been experimentally verified. This behavior of the slip factor is in clear contrast to magnetic storage rings. In the paper we compare the results of the simulations with the measurements

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TUPVA081

An MDM Spin Transparent Quadrupole for Storage Ring Based EDM Search

lattice, closed-orbit, storage-ring, dipole

2264

Y. Dutheil, M. Bai
FZJ, Jülich, Germany
D. Sagan
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

A storage ring provides an attractive option for directly measuring the electric dipole moment (EDM) of charged particles. To reach a sensitivity of 10²⁹ e.cm, it is critical to mitigate the systematic errors from all sources. This daunting task is pushing the precision frontier of accelerator science and technology beyond its current state of the art. Here, we present a unique idea of a magnetic dipole moment (MDM) spin transparent quadrupole that can significantly reduce the systematic errors due to the transverse electric and magnetic fields that particle encounters.

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TUPVA082

Spin Tracking for a Deuteron EDM Storage Ring

simulation, lattice, storage-ring, dipole

2267

Al.Alb. Skawran, A. Lehrach
FZJ, Jülich, Germany

The purpose of the Jülich Electric Dipole moment Investigations (JEDI) collaboration is the measurement of the electric dipole moment (EDM) of charged particles like deuterons. There are two possible experimental setups under consideration for realization of this measurement with deuterons: The Frozen and Quasi Frozen Spin storage ring experiments. Both approaches are discussed and compared in this presentation. Various misalignments and systematic effects are simulated in the context of comparison. Furthermore the clockwise-counterclockwise method (CW-CCW) is applied and checked for its validity.

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TUPVA083

Analysis of Closed-Orbit Deviations for a First Direct Deuteron Electric Dipole Moment Measurement at the Cooler Synchrotron COSY

closed-orbit, dipole, power-supply, simulation

2271

V. Schmidt, A. Lehrach
FZJ, Jülich, Germany

This presentation investigates closed orbit influencing effects focusing on transverse orbit deviations. Using a model of the Cooler Synchrotron COSY at the Forschungszentrum Jülich implemented in the Methodical Accelerator Design program, several magnet misalignments are simulated and analyzed. A distinction is made between magnet displacements along the axes and rotations around them. Results are always analyzed for the uncorrected as well as for the orbit after the application of an orbit correction. Furthermore, the effect of displaced beam position monitors is simulated and a constraint resolution of their readout is considered. Besides magnet misalignments also field variations resulting from residual power supply oscillations are quantified for all types of magnets.

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TUPVA099

Preparation for the CSNS-RCS Commissioning

lattice, simulation, dipole, proton

2317

Y.W. An, Y.D. Liu, Y. Liu, S. Wang, S.Y. Xu
IHEP, Beijing, People's Republic of China

Funding: Work supported by National Natural Science Foundation of China (11405189)
As a key part of the China Spallation Neutron Source (CSNS) Project, the Rapid Cycling Synchrotron (RCS) accumulates and accelerates the proton beam from 80MeV to 1.6GeV for extracting and striking the target with a repetition rate of 25Hz. As a commissioning plan, the BPM offset should be carefully investigated before closed orbit distortion (COD) correction. The fast response correctors are installed to correct orbit distortion and model the lattice of the RCS in every 1ms period. The bunch-by-bunch data from BPMs are collected and decomposed for better known of the RCS Lattice.

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TUPVA118

Particle Accelerators for Humanity: Resources for Public Engagement with Particle Accelerators

proton, survey, neutron, photon

2369

S.L. Sheehy
JAI, Oxford, United Kingdom

To those who work in the accelerator field, it is obvious that there are many applications of accelerators beyond particle physics. Yet the public remains largely unaware of the far reaching uses of accelerators, or the scientific and engineering challenges that lay behind them. A recent project Particle Accelerators for Humanity has addressed this gap by creating a series of video resources, based on a programme of live events, short films and a specially commissioned animation. The project captured the dedication and diversity of those who design, operate and work with accelerators and highlights the varied ways in which their work is impacting on our lives. Here we overview the project and the resources, available under Creative Commons license, and discuss the impact of the project so far. We encourage the accelerator community to use the resources in their teaching and public engagement activities.

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TUPVA125

LINAC5: A Quasi-Alvarez LINAC for BioLEIR

linac, ion, rfq, DTL

2385

J.M. Garland, J.-B. Lallement, A.M. Lombardi
CERN, Geneva, Switzerland

LINAC5 is a new linac proposed for the acceleration of light ions with Q/A = 1/3 to 1/4 for medical applications within the BioLEIR (Low Energy Ion Ring) design study at CERN. We propose a novel quasi-Alvarez drift-tube linac (DTL) accelerating structure design for LINAC5, which can reduce the length of a more conventional DTL structure, yet allows better beam focussing control and flexibility than the inter-digital H (IH) structures typically used for modern ion acceleration. We present the main sections of the linac with total length 12 m, including a 202 MHz radio frequency quadrupole (RFQ) a matching medium energy beam transport (MEBT) and a 405 MHz quasi-Alvarez accelerating section with an output energy of 4.2 MeV/u. Permanent magnet quadrupoles are proposed for use in the quasi-Alvarez structure to improve the compactness of the design and increase the efficiency. Lattice design considerations, multi-particle beam dynamics simulations and RFQ and radio frequency (RF) cavity designs are presented.

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TUPVA139

Characterization of the Beam from the RFQ of the PIP-II Injector Test

rfq, emittance, ion, ion-source

2425

A.V. Shemyakin, J.-P. Carneiro, B.M. Hanna, L.R. Prost, A. Saini, V.E. Scarpine, V.L. Sista, J. Steimel
Fermilab, Batavia, Illinois, USA
V.L. Sista
BARC, Mumbai, India

Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DEAC02-07CH11359 with the United States Department of Energy
A 2.1 MeV, 10 mA CW RFQ has been installed and commissioned at the Fermilab's test accelerator known as PIP-II Injector Test. This report describes the measurements of the beam properties after acceleration in the RFQ, including the energy and emittance.

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TUPVA144

Beam Based Steering in LANSCE Proton Low Energy Beam Transport

proton, emittance, beam-transport, alignment

2435

Y.K. Batygin
LANL, Los Alamos, New Mexico, USA

Beam based steering is an important procedure to minimize beam emittance growth. Low energy 750 keV LANSCE proton beam transport line before injection into Drift Tube Linac (DTL) has a length of 10 m and uses 22 quadrupoles, 6 steering magnets, 2 bending magnets, combination of prebuncher and main buncher, beam deflector, and collimators. Matching of the beam with the structure includes providing beam waists at the entrance of RF cavities, and matched beam Twiss parameters at the entrance to DTL. Typical beam emittance growth was at the level of 2-2.5. Beam based steering procedure was implemented to minimize emittance growth in the beamline. It includes determination of beam offset and beam angle entering group of quadrupoles and subsequent correction of beam angle to minimize beam offset in quadrupoles. Implementation of the procedure resulted in significant reduction of emittance growth at the level of 10%.

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TUPVA146

6D Phase Space Measurement of Low Energy, High Intensity Hadron Beam

simulation, experiment, hadron, dipole

2441

B.L. Cathey
ORNL RAD, Oak Ridge, Tennessee, USA
A.V. Aleksandrov, S.M. Cousineau, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA

Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. The work has been partially supported by NSF grant 1535312
The goal of this experiment is to measure the full 6D phase space of a low energy, high intensity hadron beam. We use 4D emittance measurement techniques for the transverse plane combined with dispersion measurement and a beam shape monitor to provide the longitudinal phase space. The Beam Testing Facility (BTF) at the Spallation Neutron Source (SNS), a 2.5 MeV functional duplicate front end of the SNS accelerator is being used to facilitate the measurement. Early 6D measurements will be presented.

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TUPVA148

FODO Lattice Design for Beam Halo Research at SNS

lattice, simulation, rfq, experiment

2449

Z.L. Zhang
ORNL RAD, Oak Ridge, Tennessee, USA
A.V. Aleksandrov, S.M. Cousineau
ORNL, Oak Ridge, Tennessee, USA

Beam halo is a big challenge for high intensity accelerators. Knowledge of the mechanisms of halo formation could help to prevent it. The Spallation Neutron Source (SNS) Beam Test Facility (BTF) is a functional duplicate of the SNS front end with enhanced diagnostics capable of accelerating 50 mA H⁻ or protons to 2.5 MeV. To explore halo development in both matched and mismatched beams, a dedicated FODO lattice is being designed as an extension to the BTF. The FODO lattice will be 3.5 meters in length and is comprised of 16 quadrupole magnets, with dedicating matching magnets. Simulations of the design lattice show halo can be seen clearly in the phase space density plot when beam is mismatched. Details of the FODO design will be presented in the paper.

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TUPVA154

Project-Based Cooperative Learning in Accelerator Science and Technology Education

dipole, feedback, FEL, cavity

2458

G. Burt
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
R.B. Appleby, G.X. Xia
UMAN, Manchester, United Kingdom
I.R. Bailey
Lancaster University, Lancaster, United Kingdom
J.A. Clarke, O.B. Malyshev, N. Marks, B.D. Muratori, M.W. Poole, Y.M. Saveliev, B.J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
C.P. Welsch, A. Wolski
The University of Liverpool, Liverpool, United Kingdom

Funding: The work is funded by STFC via the Cockcroft Institute core grant.
The next generation of particle accelerators will require the training of greater numbers of specialist accelerator physicists and engineers . These physicists and engineers should have a broad understanding of accelerator physics as well as the technology used in particle accelerators as well as a specialist in some area of accelerator science and technology . Such specialists can be trained by combining a University based PhD, in collaboration with national laboratory training with a broad taught accelerator lecture program. In order to have a faster start we decided to run an intensive two week school to replace the basic course at the Cockcroft Institute. At the same time we decided to investigate the use of problem based learning to simulate the way accelerator science tends to work in practice. In this exercise he students worked in groups of 5 to design a 3rd generation light source from scratch based on photon light specifications. In comparison to similar design exercises we stipulate that all students must do all parts and students are not allowed to specialise. A comparison with a standard lecture based education programme is discussed in this paper.

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WEOAB2

Correction of Beta-Beating Due to Beam-Beam for the LHC and Its Impact on Dynamic Aperture

sextupole, optics, dynamic-aperture, luminosity

2512

L.E. Medina Medrano, J. Barranco García, X. Buffat, Y. Papaphilippou, T. Pieloni, R. Tomás
CERN, Geneva, Switzerland
J. Barranco García, T. Pieloni
EPFL, Lausanne, Switzerland
L.E. Medina Medrano
UGTO, Leon, Mexico

Funding: This work is supported by the European Circular Energy-Frontier Collider Study, H2020 programme under grant agreement no. 654305, by the Swiss State Secretariat for Education, Research and Innovation SERI, and by the Beam project (CONACYT, Mexico).
Minimization of the beta-beating at the two main interaction points of the LHC arising from the head-on and long-range beam-beam interactions can be performed by adjusting the strength of quadrupole or sextupole correctors. This compensation scheme is applied to the current LHC optics where the results show a significant reduction of the peak and RMS beta-beating; and the impact on the dynamic aperture is computed. A proposal for a similar strategy to be adopted in the High Luminosity LHC is also discussed.

Slides WEOAB2 [6.292 MB]

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WEOAB3

RF Quadrupole Structures for Transverse Landau Damping in Circular Accelerators

damping, simulation, impedance, collider

2516

M. Schenk, X. Buffat, L.R. Carver, A. Grudiev, K.S.B. Li, E. Métral, K. Papke
CERN, Geneva, Switzerland
A. Maillard
ENS, Paris, France

The beams required for the high luminosity upgrade of the Large Hadron Collider (HL-LHC) and other potential future circular colliders (FCC) call for efficient mechanisms to suppress transverse collective instabilities. In addition to octupole magnets installed for the purpose of Landau damping in the transverse planes, we propose to use radio frequency (rf) quadrupole structures to considerably enhance the aforementioned stabilising effect. By means of the PyHEADTAIL macroparticle tracking code as well as analytical studies, the stabilising mechanism introduced by an rf quadrupole is studied and explained. It is, furthermore, compared to the influence of the second order chromaticity on transverse beam stability.

Slides WEOAB3 [2.537 MB]

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WEOBB3

Advancement of an Accelerator-Driven High-Brightness Source for Fast Neutron Imaging

neutron, target, dipole, brightness

2533

B. Rusnak, O. Alford, G.G. Anderson, S.G. Anderson, D.L. Bleuel, J.A. Caggiano, M.L. Crank, S.E. Fisher, P. Fitsos, D.J. Gibson, M. Hall, D.J. Jamero, M.S. Johnson, L. Kruse, K.S. Lange, R.A. Marsh, D. P. Nielsen, J.D. Sain, R. Souza, A. Wiedrick
LLNL, Livermore, California, USA

Funding: This work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
Lawrence Livermore National Lab (LLNL) is building an intense, high-brightness fast neutron source to create millimeter-scale neutron radiographs and images. An intense source (10¹¹ n/s/sr at 0 degrees) of fast neutrons (10 MeV) allows for penetrating very thick, dense objects while preserving the ability to create good image contrast in low density features within the object and maintaining high detector response efficiency. Fast neutrons will be produced using a pulsed 7 MeV, 300 microamp average-current commercial ion accelerator that will deliver deuteron bunches to a 3 atmosphere deuterium gas cell target to produce neutrons by the D(d, n)3He reaction. Due to the high power density of such a tightly focused, modest-energy ion beam, the transport, controls, diagnostics, and in particular the neutron production gas target and beam stop approaches present significant engineering challenges. Progress and status on the building and early commissioning of the lab-scale demonstration machine shall be presented.

Slides WEOBB3 [2.654 MB]

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WEOCB2

Superconducting Magnets at FAIR

dipole, operation, superconducting-magnet, ion

2546

E.S. Fischer, A. Bleile, J. Ceballos Velasco, V.I. Datskov, F. Kaether, J.P. Meier, A. Mierau, H. Müller, C. Roux, P.J. Spiller, K. Sugita
GSI, Darmstadt, Germany

For the FAIR (Facility of Antiproton and Ion Research) accelerators, various technologies of superconducting magnets have been developed. In total, 613 superconducting magnets are required for the FAIR modularized start version. For the heavy ion synchrotron SIS100, which is the central accelerator under construction, fast ramped, iron dominated superconducting magnets of the Nuclotron type will be used. Due to the high beam intensity operation desired for SIS100, highest precision and reproducibility is requested for the iron yoke of these magnets. For the dipole magnets of SIS100 the series production has already been released. In parallel, the Super-FRS will be built for the generation of radioactive beams and for isotope separation. Huge aperture superconducting dipole magnets and multiplet modules are required for the main separator of the Super-FRS. For testing of the various types of sc magnets, three test facilities at GSI, JINR and CERN have been set-up. We give an overview on the modern design aspects for the different magnet types and their first test results and the preparation of the appropriate test facilities.

Slides WEOCB2 [12.633 MB]

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WEPAB003

The Danish Synchrotron Radiation Light Source ASTRID2

cavity, synchrotron, dipole, operation

2561

J.S. Nielsen, N. Hertel, S.P. Møller
ISA, Aarhus, Denmark

The ASTRID2 synchrotron light source has now been in user operation for more than 3 years, and most of the initially unresolved minor issues have been dealt with. This paper will report on the solutions, and give an over-view of the current status. The problem of the fast injection bumpers, which overheated at high currents, has been solved. The 3rd harmonic Landau cavity has been installed, and it has resulted in a much better lifetime and a more stable beam. We observe vertically unstable beams above a given threshold beam current. Initially this threshold was quite low, but with time, as the vacuum chambers have been conditioned more and more, the threshold has increased steadily, and is now close to the design current of 200 mA. It is planned to add 3 more power supplies to each of the pole-face windings, which are found in all 12 dipoles. These three supplies will in addition to the original quadrupole correctors give a vertical corrector, a horizontal corrector and a skew quadrupole corrector. Furthermore we are presently producing a new timing system, which will allow us to run single-bunch operation, and a fast orbit feedback system.

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WEPAB060

Design Study for the First Version of the HALS Lattice

lattice, storage-ring, sextupole, emittance

2713

Z.H. Bai, W. Li, L. Wang, P.H. Yang
USTC/NSRL, Hefei, Anhui, People's Republic of China

The Hefei Advanced Light Source (HALS) was proposed as a future soft X-ray diffraction-limited storage ring at NSRL. Recently the first version lattice of the HALS storage ring has been studied using a new lattice design concept that we proposed for diffraction-limited storage rings. In this new concept, the beta functions of each cell are made to be locally symmetric. In this paper, an 8BA lattice and a 6BA lattice are designed for the HALS with the first and the second kind of the new concept, respectively. In their nonlinear optimization, good dynamic aperture and momentum aperture can be easily obtained. Especially the dynamic momentum aperture can be larger than 7% or even 10%, which enables long beam lifetime and implementation of longitudinal injection scheme. The studied 6BA lattice is at present considered as the nominal HALS lattice of the first version.

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WEPAB105

Design of the ALS-U Storage Ring Lattice

lattice, emittance, storage-ring, focusing

2827

C. Sun, J.-Y. Jung, H. Nishimura, D. Robin, F. Sannibale, C. Steier, C.A. Swenson, M. Venturini, W. Wan
LBNL, Berkeley, California, USA

Funding: The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory is proposing the upgrade of its synchrotron light source to reach soft x-ray diffraction limits within the present ALS footprint. The storage ring lattice design and optimization of this light source is one of the challenging aspects for this proposed upgrade. The candidate upgrade lattice needs not only to fulfill the physics design requirements such as brightness, injection efficiency and beam lifetime, but also to meet engineering constraints such as space limitations, maximum magnet strength as well as beamline port locations. In this paper, we will present the lattice design goals and choices and discuss the optimization approaches for the proposed ALS upgrade.

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WEPAB114

Potential Performance Limit of Storage Rings

emittance, storage-ring, sextupole, optics

2836

X. Huang
SLAC, Menlo Park, California, USA

The next generation of storage ring light sources will have significantly higher performance as multi-bend achromat cell structures are made practical with strong quadrupole and sextupole magnets. In principle the natural emittance can be made ever smaller with stronger magnets and larger rings until it reaches the true diffraction limit for hard X-rays. By considering the scaling laws of linear optics and nonlinear beam dynamics of storage rings and technical challenges, we explore the potential performance limit of future storage rings. A similar discussion may be applicable to the limit of energy frontier heavy-ion storage ring colliders.

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WEPAB120

Reproducibility Issues of NSLS-II Storage Ring and Modeling of the Lattice

operation, lattice, storage-ring, dipole

2851

J. Choi, W. Guo, T.V. Shaftan, X. Yang
BNL, Upton, Long Island, New York, USA

Funding: DOE Contract No: DE-SC0012704
As other facilities, in operating NSLS-II, we develop the lattices based on theoretical and simulation studies. Then the lattice is applied and the machine is optimized to have the desired design parameters. This process is very typical and works well and, furthermore, there is a general understanding that a model with the field measurement data is not realized as it is. However, it is evident that if the model represents the real machine close enough, there are lots of advantages we can take. One of them can be producing the lattice with changing environments. In this paper, we discuss the NSLS-II reproducibility status and efforts to construct the faithful realistic model.

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WEPIK006

Cancellation of the Leak Field from Lambertson Septum for the Beam Abort System in the SuperKEKB

coupling, sextupole, emittance, septum

2918

N. Iida, M. Kikuchi, K. Kodama, T. Mimashi, T. Mori, Y. Ohnishi, K. Oide, H. Sugimoto, M. Tawada
KEK, Ibaraki, Japan

The first commissioning of SuperKEKB, Phase 1, was performed from February 2016 for five months. A Lambertson septum magnet is utilized to vertically extract the aborted beam, kicked by the horizontal abort kickers upstream into a beam dump. This magnet creates unexpected leak field with a non-negligible skew quadrupole component to the stored beam. Two kinds of skew quadrupole magnets are installed on both sides of the Lambertson septum. One is additional skew windings on the sextupole magnet, and the other is a skew quadrupole magnet with permanent magnets. This paper will report that the cancellations of the leak fields was successful and useful for optics correction.

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WEPIK007

Optics Design and Observation for the Beam Abort System in SuperKEKB HER

sextupole, optics, injection, kicker

2922

N. Iida, K. Egawa, Y. Enomoto, Y. Funakoshi, M. Kikuchi, T. Mimashi, Y. Ohnishi, K. Oide, Y. Suetsugu
KEK, Ibaraki, Japan

In the first commissioning of SuperKEKB, which is 'Phase 1', the new abort system is tested in the High Energy Ring (HER). There is a risk that aborted beams with low emittance and high current may destroy the window for extraction from beam pipe. In order to enlarge the aborted beam at the window, quadrupole field is applied only for the aborted beam. In the Low Energy Ring (LER), quadrupole pulsed magnets will be installed to enlarge the aborted beam, and in the HER, a pair of identical sextupole magnets is installed between the abort kickers and the extraction window. These sextrupole magnets are connected by I or 'I transformation to cancel the geometrical nonlinearity for the stored beam in the ring. This paper will report the optics design for the abort system of the HER as well as the observation of the aborted beam.

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WEPIK021

MDI Issues in CEPC Double Ring

radiation, detector, synchrotron, synchrotron-radiation

2965

B. Sha, J. Gao, Y. Wang, C.H. Yu
IHEP, Beijing, People's Republic of China

With the discovery of the higgs boson at around 125GeV, a circular higgs factory design with high luminosity (L ~ 10³⁴ cm^-2 s^-1) is becoming more popular in the accelerator world. The CEPC project in China is one of them. Machine Detector Interface (MDI) is the key research area in electron-positron colliders, especially in CEPC, it is one of the criteria to measure the accelerator and detector design performance. Because of the limitation from the existing tunnel, many equipment including magnets, beam diagnostic instruments, masks, vacuum pumps, and components of the detector must coexist in a very small region. In this paper, some important MDI issues will be reported for the Interaction Region (IR) design, e.g. the final doublet quadrupoles physics design parameters, beam-stay-clear region and beam pipe, synchrotron radiation power and critical energy are also calculated.

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WEPIK034

Progress in the FCC-ee Interaction Region Magnet Design

solenoid, detector, emittance, interaction-region

3003

M. Koratzinos, A.P. Blondel
DPNC, Genève, Switzerland
M. Benedikt, F. Zimmermann
CERN, Geneva, Switzerland
E.R. Bielert
University of Illinois at Urbana-Champaign, Illinois, USA
A.V. Bogomyagkov, S.V. Sinyatkin, P. Vobly
BINP SB RAS, Novosibirsk, Russia
M. Boscolo
INFN/LNF, Frascati (Roma), Italy
M. Dam
NBI, København, Denmark
K. Oide
KEK, Ibaraki, Japan

The design of the region close to the interaction point of the FCC-ee experiments is especially challenging. The beams collide at an angle (±15mrad) in a region where the detector solenoid magnetic field is large. Moreover, the very low vertical β^* of the machine necessitates that the final focusing quadrupoles are also inside this high field region. The beams should be screened from the effect of the detector solenoid field, and the emittance blow-up due to vertical dispersion in the interaction region should be minimized while leaving enough space for detector components. Crosstalk between the two final focus quadrupoles, only about 6 cm apart at the tip, should also be minimized. We present an update on the subject.

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WEPIK048

Evaluation and Mitigation of Synchrotron Radiation Background in the eRHIC Ring-Ring Interaction Region

detector, electron, radiation, photon

3032

C. Montag
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
Synchrotron radiation is a potential source of background in the detector of any future electron-ion collider. In the case of the eRHIC ring-ring design, a 22mrad crossing angle eliminates the need for a separator dipole, which would otherwise be a major source of synchrotron radiation. However, electrons in the transverse tails experience strong magnetic fields in the low-beta quadrupoles near the interaction point. Despite the low electron density in the tails the resulting hard radiation generated in these strong fields is a major concern, and a set of masks needs to be in place to shield the detector from these photons. We present simulation studies and a first design of a synchrotron radiation masking scheme.

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WEPIK061

Lattice Tuning and Error Setting in Accelerator Toolbox

lattice, dipole, closed-orbit, multipole

3067

S.M. Liuzzo, N. Carmignani, L. Farvacque, B. Nash
ESRF, Grenoble, France

New lattice designs need to be studied in the presence of magnetic and alignment errors and appropriate lattice tuning procedures. For this reason a set of tools to perform a commissioning-like sequence has been developed for the ESRF-EBS* ** upgrade in Accelerator Toolbox (AT)*** and is now generalized to be used for other accelerators lattice design. The functions presented here allow to correct first turn trajectory, orbit, tune, chromaticity, optics and coupling, in any order. A set of functions to define errors is introduced to address, among others, the issues of: misalignment of magnets modeled by several slices, multiple errors setting on the same magnet and spatially recursive errors along the lattice.
* J.C. Biasci et al. ,A low emittance lattice for the ESRF, Synchrotron Radiation News, vol. 27, Iss.6, 2014.
** ESRF upgrade programme phase II, ESRF, December 2014.
*** Nash, B. et al.. New functionality for beam dynamics in Accelerator Toolbox (AT) IPAC'15.

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WEPIK085

Beam Shaping with 4N-order Multipole Magnets

octupole, focusing, multipole, electron

3124

B.T. Folsom, E. Laface
ESS, Lund, Sweden

A uniformly irradiating beam is beneficial in spallation for preventing irregular wear on the target. For octupoles (n = 4) and higher-order (n = 4N) magnets, passing charged-particle bunches undergo symmetric shaping effects along the x and y axes. Using a Lie-mapping formalism, we illustrate how well Gaussian distributions can be flattened symmetrically in 2D with single, dual-pulse, and RF magnets of 4N order. Incidental shaping effects are also discussed.

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WEPIK101

Novel Implementation of Quadrupole and Higher Order Fringe Fields to Accelerator Design

multipole, sextupole, dipole, space-charge

3184

B.D. Muratori
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Until recently, in the initial design phase of any accelerator project, it was not possible to have an adequate description of quadrupole and higher order multipole fringe fields. We report on the latest developments in analytical fringe fields for multipoles, particularly for quadrupoles and sextupoles. We show how they can be used to improve accelerator codes and make them both faster and more precise. We also show how the analytical formulae for the fringe fields yield expressions for both the scalar and vector potentials in electromagnetism. We conclude by discussing the application of both potentials to the design of multipole magnets as well as the implementation of symplectic kick approximations for fringe fields in thin lens models that could be used in accelerator codes.

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WEPIK119

Lost Muon Study for the Muon g-2 Experiment at Fermilab

storage-ring, positron, background, experiment

3230

J.D. Crnkovic, W. Morse
BNL, Upton, Long Island, New York, USA
S. Ganguly
University of Illinois at Urbana-Champaign, Urbana, USA
D. Stratakis
Fermilab, Batavia, Illinois, USA

The Fermilab Muon g-2 Experiment has a goal of measuring the muon anomalous magnetic moment to a precision of 140 ppb - a fourfold improvement over the 540 ppb precision obtained by the BNL Muon g-2 Experiment. Some muons in the storage ring will interact with material and undergo bremsstrahlung, emitting radiation and loosing energy. These so called lost muons will curl in towards the center of the ring and be lost, but some of them will be detected by the calorimeters. A systematic error will arise if the lost muons have a different average spin phase than the stored muons. Algorithms are being developed to estimate the relative number of lost muons, so as to optimize the stored muon beam. This study presents initial testing of algorithms that can be used to estimate the lost muons by using either double or triple detection coincidences in the calorimeters.

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WEPVA041

Rematching AGS Booster Synchrotron Injection Lattice for Smaller Transverse Beam Emittances

booster, injection, proton, emittance

3353

C. Liu, J. Beebe-Wang, K.A. Brown, C.J. Gardner, H. Huang, M.G. Minty, V. Schoefer, K. Zeno
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The polarized proton beam is injected into the booster via the charge-exchange (H⁻ to H⁺) scheme. The emittance growth due to scattering at the stripping foil is proportional to the beta functions at the foil. It was demonstrated that the current scheme of reducing the beta functions at the stripping foil preserves the emittance better, however the betatron tunes are above but very close to half integer. Due to concern of space charge and half integer in general, options of lattice designs aimed towards reducing the beta functions at the stripping foil with tunes at more favorable places are explored.

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WEPVA049

Vacuum- and Bake-Out-Testbenches for the HESR at FAIR

dipole, vacuum, ion, heavy-ion

3366

H. Jagdfeld, M. Bai, U. Bechstedt, N. Bongers, P. Chaumet, F.M. Esser, F. Jordan, F. Klehr, G. Langenberg, G. Natour, U. Pabst, D. Prasuhn, L. Semke, F. Zahariev
FZJ, Jülich, Germany

The High-Energy Storage Ring (HESR) is one part of the international Facility for Antiproton and Ion Research (FAIR) at GSI Darmstadt. Forschungszentrum Jülich (IKP and ZEA-1) is responsible for the design and development of the HESR. The HESR is designed for antiprotons and heavy ion experiments as well. Therefore the vacuum is required to be 10^-11 mbar or better. To achieve this also in the curved sections, where 44 bent dipole magnets are installed, NEG coated dipole chambers will be used to reach the needed pumping speed and capacity. For activation of the NEG a bake-out system is needed. Two test benches were installed to investigate the required equipment needed to reach this low pressure: A vacuum test bench to investigate the influence of different types and quantity of vacuum pumps for the straight sections of the HESR A bake-out test bench for checking the achievable end pressure and develop the bake-out system for the NEG coated dipole chambers in the curved sections of the HESR The results of the tests and the bake-out concept including the layout of the control system and the special design of the heater jackets inside the dipoles and quadrupoles are presented.
1 Central Institute of Engineering, Electronics and Analytics- Engineering and Technology ZEA-1
2 Institute for nuclear physics

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WEPVA051

Power Converters for the ESS Warm Magnets

beam-transport, linac, dipole, neutron

3372

R. Visintini, M. Cautero
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
G. Göransson, C.A. Martins, P.J. Torri
ESS, Lund, Sweden

In the framework of the Italian In-Kind Contribution (IKC) to the construction of the European Spallation Source (ESS), Elettra Sincrotrone Trieste is in charge of providing some key equipment for the accelerator. Among them, there are the magnets and the associated power converters for the Linac Warm Units (LWU), the High Energy Beam Transport (HEBT) dogleg, the Dump Line (DmpL) and the Accelerator to Target (A2T) sections of the neutron source. Magnets and their power converters are complementary parts of common systems. Their design cannot be totally separated, requiring iterations for an optimal solution that should include also power cable standardization. This work will describe the power converters' solutions adopted for the magnets of the above-mentioned sections. They comprise 4-Quadrant power converters for the correctors, compact DC power converters for the small quadrupole magnets and more powerful DC power converters for the dipole and large quadrupole magnets.

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WEPVA053

New Extraction Line for the Lns Cyclotron

extraction, cyclotron, ion, emittance

3378

L. Calabretta, A. Calanna, G. D'Agostino, D. Rifuggiato, A.D. Russo
INFN/LNS, Catania, Italy
G. D'Agostino
Universita Degli Studi Di Catania, Catania, Italy

The LNS Superconducting Cyclotron will be modified to allow the extraction by stripper of ion beams with power up to 10 kW. By choosing properly the position of the stripper foils and of the corrector magnetic channels, it is possible to convoy the trajectories of the selected representative ion beams across a new extraction channel. It is mandatory to design a new extraction line to transport these beams to the existing beam transport line. The extracted beams have an energy spread of about ±0.4%, so, the new extraction line has to compensate the correlation energy-position of the beam and to produce an achromatic waist of the beam at the common starting point of the existing transport lines. The main changes of the cyclotron will be briefly described and the performance and the features of the new extraction line will be presented too.

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WEPVA065

High Precision Magnet Powering for the SESAME Storage Ring

power-supply, controls, dipole, timing

3418

S.Kh. Jafar, I.A. Abid, A. Ismail
SESAME, Allan, Jordan
E.O. Ari
ASELSAN A.S., Ankara, Turkey
M.C. Bastos, T. Henschel
CERN, Geneva, Switzerland
E.H. Yousefi
ILSF, Tehran, Iran

SESAME is the first synchrotron light source for the Middle East and is expected to start its operation mid-2017. It is composed of a 22 MeV Microtron, a 0.8 GeV booster synchrotron and a 2.5 GeV storage ring. The storage ring magnets and power supplies were designed, produced and validated under the framework of a collaboration between SESAME and CERN, supported by the European Commission. The power supply control strategy for the SESAME main ring follows the same model used in the LHC, where the power supplies are voltage sources bought from industry, to which a specially designed control unit and current sensors are added to implement a high precision current source. This strategy provides modularity, ease of maintenance, better control over performance and flexibility for the machine. Machine flexibility is further enhanced by individually powering the quadrupole magnets. In this paper, the powering strategy, design and validation of the magnet power supplies are described. Some of the challenges faced during those phases are discussed. Finally, performance results are presented, showing stability of the dipole power supply at nominal current of about 10 parts per million.

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WEPVA088

Testing of SC-Magnets of NICA booster synchrotron

booster, dipole, synchrotron, cryogenics

3461

S.A. Kostromin, V.V. Borisov, A.M. Donyagin, A.R. Galimov, O. Golubitsky, H.G. Khodzhibagiyan, B.Yu. Kondratiev, S.A. Korovkin, A.V. Kudashkin, G.L. Kuznetsov, D. Nikiforov, A.V. Shemchuk, A.Y. Starikov, A. Tikhomirov
JINR, Dubna, Moscow Region, Russia
T.E. Serochkina
JINR/VBLHEP, Dubna, Moscow region, Russia

Serial tests of sc-magnets of NICA Booster started at the dedicated facility of LHEP JINR. Magnets' assembly and testing workflow are presented. Main steps of the magnet preparation to the cryogenics tests are described. First results of serial tests are presented and discussed.

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WEPVA089

Magnetic Measurement System for the NICA Quadrupole Magnets

booster, controls, superconducting-magnet, collider

3464

A.V. Shemchuk
JINR/VBLHEP, Dubna, Moscow region, Russia
V.V. Borisov, A.V. Bychkov, A.M. Donyagin, O. Golubitsky, H.G. Khodzhibagiyan, S.A. Kostromin, M.M. Omelyanenko, M.M. Shandov
JINR, Dubna, Moscow Region, Russia

NICA is a new accelerator collider Nuclear Research (JINR) in Dubna. More than 250 superconducting magnets need for the NICA booster and collider. These magnets will be assembled and tested at the new test facility in the Laboratory of High Energy Physics JINR. A method of measuring the quality of the magnetic field in the aperture of the quadrupole magnet for the booster synchrotron is described. Commissioning of equipment for magnetic measurements in the aperture of the doublet of quadrupole lenses is described.

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WEPVA116

HL-LHC Inner Triplet Powering and Control Strategy

controls, simulation, luminosity, hadron

3544

S. Yammine, H. Thiesen
CERN, Geneva, Switzerland

In order to achieve the target 3000 fb-1 integrated field for the HL-LHC (High Luminosity ' Large Hadron Collider) at ATLAS and CMS, new large aperture quadrupoles are required for the final focusing triplet magnets before the interaction points. These low-' magnets, based on the Nb3Sn technology, deliver a peak field of 11.4 T. They consist of two outer quadrupoles, Q1 and Q3 and a central one divided into two identical magnets, Q2a and Q2b. To optimize the powering and the beam dynamics of these triplets, the quadrupoles will be powered in series by a single high-current two quadrants (2-Q) converter [18 kA, ±10 V]. Three 4-Q trim power converters are added over Q1 [±2 kA, ±10 V], Q2a [±0.12 kA, ±10 V] and Q3 [±2 kA, ±10 V] to account for possible transfer function difference between the quadrupoles. This paper presents the powering scheme of the four mentioned coupled circuits. A digital control strategy, using four standard LHC digital controllers, to decouple the four systems and to achieve a high precision control is proposed and discussed.

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WEPVA140

Design Studies and Optimization of High-Field Nb₃Sn Dipole Magnets for a Future Very High Energy pp Collider

dipole, collider, magnet-design, operation

3597

V.V. Kashikhin, I. Novitski, A.V. Zlobin
Fermilab, Batavia, Illinois, USA

Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
High filed accelerator magnets with operating fields of 15-16 T based on the Nb3Sn superconductor are being considered for the LHC energy upgrade or a future Very High Energy pp Collider. Magnet design studies are being conducted in the U.S., Europe and Asia to explore the limits of the Nb3Sn accelerator magnet technology while optimizing the magnet design and performance parame-ters, and reducing magnet cost. The first results of these studies performed at Fermilab in the framework of the US-MDP are reported in this paper.

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WEPVA151

The eRHIC Interaction Region Magnets

electron, hadron, dipole, shielding

3624

B. Parker, R.B. Palmer, H. Witte
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
Designing eRHIC Interaction Region (IR) magnets faces special Machine Detector Interface challenges. Based upon HERA-II experience, a fundamental consideration is to avoid excessive background due to synchrotron radiation striking masks and septa in the vicinity of the experiment. Circumventing such radiation is problematic because the colliding beams have quite different rigidities; we must shield the e-beam from hadron IR magnet multi-tesla coil fields. On the outgoing-hadron, i.e. forward IR side, this difficulty is compounded by needing large hadron beam apertures to enable downstream separation and experimental detection of a mix of scattered and produced forward going charged particles and (in the electron-ion case) a wide-spread cone of neutrons. Here we present superconducting magnet designs with combinations of active and passive shielding and Sweet Spot coils to meet these requirements along with the design of a superferric spectrometer dipole, with an integrated cancel coil, that extends the forward experimental acceptance.

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THOBA3

A Compact 335 MeV Positron Damping Ring Design for FACET-II

positron, damping, emittance, linac

3652

G.R. White, Y. Cai, R.O. Hettel, M.A.G. Johansson, V. Yakimenko, G. Yocky
SLAC, Menlo Park, California, USA

Funding: This work was supported by the Department of Energy under Contract Number: DE-AC02-76SF00515.
FACET-II will be a new test facility, starting construction in 2018 within the main SLAC Linac. Its purpose is to build on the decades-long experience developed conducting accelerator R&D at SLAC in the areas of advanced acceleration and coherent radiation techniques with high-energy electron and positron beams. The positron system design utilizes an existing W-Re target in Linac Sector 19, driven by 4 nC electrons bunches at 10 GeV. We present the design of a 335 MeV, 21.4 m circumference damping ring required to damp emittance from a modified positron return beamline by a factor of 500. The transverse emittance is calculated to be 6 um-rad, fully coupled, with a bunch length of 4 mm and energy spread 0.06 %, at a bunch charge of 1 nC. The arc magnets need to be especially compact due to tight space constraints (installation will be in the existing SLAC Linac tunnel, Sector 10, with 3 m width available) and were a key design challenge. We present a solution with combined function bend/quadrupole/sextupole magnets which have been modelled in 3D using Opera.

Slides THOBA3 [8.372 MB]

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THPAB038

DYNAC: Extensions, Updates, and Upgrades

simulation, lattice, operation, linac

3784

S. Molloy, E. Tanke
ESS, Lund, Sweden

DYNAC is a multi-particle beamline simulation code suitable for modelling of the motion of protons, heavy ions, or electrons, moving through linear accelerators and beam transport lines. In this paper, we document extensions written in Python. It will be shown how these Python extensions add a considerable amount of flexibility to DYNAC, while maintaining the calculation speeds available from the core Fortran source. Real-world use-cases are discussed. In addition, some improvements that have been made to the DYNAC source are reported.

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THPAB055

Modelling of Curvilinear Electrostatic Multipoles in the Fermilab Muon g-2 Storage Ring

multipole, emittance, storage-ring, lattice

3837

A.T. Herrod, S. Jones, A. Wolski
The University of Liverpool, Liverpool, United Kingdom
I.R. Bailey, A.T. Herrod, S. Jones, M. Korostelev, A. Wolski
Cockcroft Institute, Warrington, Cheshire, United Kingdom
I.R. Bailey, M. Korostelev
Lancaster University, Lancaster, United Kingdom

Funding: This research was funded by the STFC Cockcroft Institute Core grants no. ST/G008248/1 and ST/P002056/1.
The Fermilab Muon g-2 Experiment (E989) contains flat-plate electrostatic quadrupoles, curved with the reference trajectory as defined by the constant, uniform magnetic dipole field. To understand the beam behaviour at a sufficient level, we require fast, high-accuracy particle tracking methods for this layout. Standard multipole fits to numerically calculated 2D transverse electric field maps have provided a first approximation to the electric field within the main part of the quadrupole, but cannot model the longitudinal curvature or extended fringe fields of the electrostatic plates. Expressions for curvilinear multipoles can be fit to a 2D transverse slice taken from the central point of a numerically calculated 3D electric field map of the quadrupole, providing a curved-multipole description. Generalised gradients can be used to model the fringe field regions. We present the results of curvilinear multipole and generalised gradient fits to the curved quadrupole fields, and the differences in tracking using these fields over 200 turns of a model of the storage ring in BMAD.

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THPAB062

Preliminary Simulations on Chirpless Bunch Compression using Double-EEX Beamline

emittance, controls, simulation, dipole

3862

G. Ha
POSTECH, Pohang, Kyungbuk, Republic of Korea
M.E. Conde, D.S. Doran, W. Gai, J.G. Power
ANL, Argonne, Illinois, USA

Funding: This work is supported by Department of Energy, Office of High Energy Physics, under Contract No. DE-AC02-06CH11357.
An emittance exchange (EEX) beamline can be used to compress an electron bunch via its transverse-to-longitudinal exchange mechanism. We are investigating this as an alternative to the normal magnetic chicane bunch compressor. The chicane method requires a longitudinal chirp before the chicane (since it relies on the path length difference of different energies) which results in an unwanted chirp after the compressor. Alternatively, the EEX method uses quadrupole magnets to compress the bunch. In this paper, we present preliminary simulations in preparation for a demonstration of chirp-less bunch compression using an EEX beamline at the Argonne Wakefield Accelerator facility.

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THPAB073

Magnetized and Flat Beam Experiment at FAST

emittance, electron, radiation, cathode

3876

A. Halavanau, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
J. Hyun
Sokendai, Ibaraki, Japan
D. Mihalcea, P. Piot, T. Sen, J.C.T. Thangaraj
Fermilab, Batavia, Illinois, USA

A photocathode, immersed in solenoidal magnetic field, can produce canonical-angular-momentum (CAM) dominated electron beams. Such beams have an application in electron cooling of hadron beams and can also be uncoupled to yield asymmetric-emittance (flat) beams. In the present paper we explore the possibilities of the flat beam generation at Fermilab's Accelerator Science and Technology (FAST) facility linear accelerator. We present optimization of the beam flatness and four-dimensional transverse emittance and investigate the mapping and its limitations of the produced eigen-emittances to conventional emittances using a skew-quadrupole channel. Possible application of flat beams at the FAST facility are also discussed.

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THPAB092

Orbit and Dispersion Tool at European XFEL Injector

laser, electron, dipole, GUI

3932

N. Ghazaryan
CANDLE SRI, Yerevan, Armenia
M.E. Castro Carballo, W. Decking
DESY, Hamburg, Germany

Trajectory and electron beam size play an essential role in Free Electron Laser (FEL) obtainment. Since transverse dispersion changes off-energy particle trajectories and increases the effective beam size, dispersion and orbit must constantly be controlled and corrected along the whole lattice. In this paper the principles underlying the orbit and dispersion correction tool, developed at DESY, are described. The results of its testing on European XFEL injector are presented.

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THPAB096

Automatized Optimization of Beam Lines Using Evolutionary Algorithms

ion, injection, simulation, operation

3941

S. Appel, V. Chetvertkova, W. Geithner, F. Herfurth, U. Krause, S. Reimann, M. Sapinski, P. Schütt
GSI, Darmstadt, Germany
D. Österle
KIT, Karlsruhe, Germany

Due to the massive parallel operation modes at GSI accelerators, a lot of accelerator setup and re-adjustment has to be made by operators during a beam time. This is typically done manually using potentiometers and is very time-consuming. With the FAIR project the complexity of the accelerator facility increases further and for efficiency reasons it is recommended to establish a high level of automation for future operation. Modern Accelerator Control Systems allow a fast access to both, accelerator settings and beam diagnostics data. This provides the opportunity to implement algorithms for automated adjustment of e.g. magnet settings to maximize transmission and optimize required beam parameters. The fast-switching magnets in GSI-beamlines are an optimal basis for an automatic exploration of the parameter-space. The optimization of the parameters for the SIS18 multi-turn-injection using a genetic algorithm has already been simulated*. The first results of our automatized online parameter optimization at the CRYRING@ESR injector are presented here.
[*] S. Appel, O. Boine-Frankenheim: Optimization of Multi-turn Injection into a Heavy-Ion Synchrotron using Genetic Algorithms, Proceedings of IPAC2015, Richmond, USA (2015)

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THPAB147

Automatic Local Aperture Measurements in the SPS

dipole, target, proton, vacuum

4073

V. Kain, H. Bartosik, S. Cettour Cave, K. Cornelis, F.M. Velotti
CERN, Geneva, Switzerland

The CERN SPS (Super Proton Synchrotron) serves as LHC injector and provides beam for the North Area fixed target experiments. It is equipped with flat vacuum chambers to accommodate the large horizontal beam size required during transition crossing and slow extraction. At low energy, the vertical acceptance becomes critical with high intensity large emittance fixed target beams. Optimizing the vertical available aperture is a key ingredient to optimize transmission and reduce activation around the ring. Aperture measurements are routinely carried out after each shutdown. Global vertical aperture measurements are followed by detailed bump scans at the locations with the loss peaks. During the 2016 run a tool was developed to provide an automated local aperture scan around the entire ring. This allowed to establish detailed reference measurements of the vertical aperture and identify directly the SPS aperture bottlenecks. The methodology applied for the scans will be briefly described in this paper and the analysis discussed. Finally, the 2016 SPS measured vertical aperture will be presented and compared to the results obtained with the previous method.

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THPAB151

Online Optimisation Applications at SPS

injection, coupling, storage-ring, sextupole

4086

T. Pulampong, P. Klysubun, S. Kongtawong, S. Krainara, P. Sudmuang
SLRI, Nakhon Ratchasima, Thailand

Optimisation of a particle accelerator with very limited diagnostic system is proved to be very challenging and complicated. Theoretical calculation and perfect machine model never guarantee the best solution in the actual machine. In this work, optimisation of injection system from Low energy Beam Transport line (LBT) to Siam Photon Source (SPS) storage ring and reduction of beam coupling employing Robust Conjugate Direction Search (RCDS) algorithm are demonstrated. New record improvement on injection efficiency and better coupling control will be presented.

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THPIK007

Production of Low Cost, High Field Quality Halbach Magnets

multipole, dipole, simulation, controls

4118

S.J. Brooks, J. Cintorino, A.K. Jain, G.J. Mahler
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A shimming method has been developed at BNL that can improve the integrated field linearity of Halbach magnets to roughly 1 unit (1 part in 10⁴) at r=10mm. Two sets of magnets have been produced: six quadrupoles of strength 23.62T/m and six combined-function (asymmetrical) Halbach magnets of 19.12T/m with a central field of 0.377T. These were assembled using a 3D printed plastic mould inside an aluminium tube for strength. A shim holder, which is also 3D printed, is fitted within the magnet bore and holds iron wires of particular masses that cancel the multipole errors measured using a rotating coil on the unshimmed magnet. A single iteration of shimming reduces error multipoles by a factor of 4 on average. This assembly and shimming method results in a high field quality magnet at low cost, without stringent tolerance requirements or machining work. Applications of these magnets include compact FFAG beamlines such as FFAG proton therapy gantries, or any bending channel requiring a ~4x momentum acceptance. The design and shimming method can also be generalised to produce custom nonlinear fields, such as those for scaling FFAGs.

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THPIK012

The Magnets of BERLinPro: Specification, Design, Measurement and Quality Analysis

dipole, multipole, sextupole, operation

4124

A.N. Matveenko, M. Abo-Bakr, K.B. Bürkmann-Gehrlein
HZB, Berlin, Germany
I.V. Davidyuk, O.A. Shevchenko, A.V. Utkin, N.A. Vinokurov
BINP SB RAS, Novosibirsk, Russia

Funding: Work supported by grants of Helmholtz Association VH-NG-636 and HRJRG-214
A total of 77 magnets form the magnetic lattice of the BERLinPro energy recovery linac prototype: 1+8+8 dipole magnets of three different types, 12+40 quadrupole magnets of two different types and 8 sextupole magnets have been produced by BINP. After the design phase, magnets production started in 2015, measurements and delivery took place in 2016, first assembly stage was finished in 03/2017. The motivation for the magnet specification and a summary of the basic design is given in this paper. Select-ed measurement data from the final acceptance tests are presented and analysed to ensure the magnet quality.

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THPIK021

Structural Mechanical Analysis of 4-Rod RFQ Structures in View of a Newly Revised CW RFQ for the HLI at GSI

rfq, linac, simulation, resonance

4142

D. Koser, H. Podlech
IAP, Frankfurt am Main, Germany
P. Gerhard, L. Groening
GSI, Darmstadt, Germany
O.K. Kester
TRIUMF, Vancouver, Canada

Funding: BMBF Contr. No. 05P15RFRBA
The High Charge State Injector (HLI) at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, serves as one of the two injector linacs for the UNILAC as well as dedicated injector for the upcoming cw linac project for super heavy element research. As the front end of the HLI is planned to be upgraded for cw operation a newly revised cw capable RFQ structure with an operating frequency of 10⁸ MHz is required. The existent 4-rod structure, which was commissioned at the HLI in 2010, suffers from severe modulated rf power reflections originating from mechanical oscillations of the electrodes that both limit the achievable performance and impede stable operation*. Besides preceding vibration measurements that were done by GSI using a laser vibrometer**, the structural mechanical behavior of the 4-rod geometry was extensively analyzed using ANSYS Workbench. Thereby the crucial mechanical eigenmodes could be identified and their impact on the rf properties was investigated by simulations using CST MWS. A completely newly revised 4-rod RFQ design with optimized structural rigidity was developed of which a 6-stem prototype is currently being manufactured.
*P. Gerhard et al., Experience With a 4-Rod CW Radio Frequency Quadrupole, LINAC12, THPLB07
**P. Gerhard et al., In Situ Measurements of Mechanical Vibrations of a 4-Rod RFQ at GSI, LINAC14, TUPP057

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THPIK022

Measurements of High-Order Magnetic Field Components of Permanent Quadrupole Magnets for a Laser-Plasma-Driven Undulator X-Ray Source

electron, laser, plasma, permanent-magnet

4145

P. Winkler
University of Hamburg, Hamburg, Germany
D. Kocon, A.Y. Molodozhentsev
ELI-BEAMS, Prague, Czech Republic
A.R. Maier
CFEL, Hamburg, Germany
L. Pribyl
Czech Republic Academy of Sciences, Institute of Physics, Prague, Czech Republic
M. Trunk
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany

Laser wakefield acceleration as a novel source of high-energy electron beam is a prominent candidate to drive a next generation of compact light sources. For applications, the electron beam needs to be captured using quadrupole magnets with extremely high field gradient. It allows to preserve properties of the laser-plasma driven electron beam. We designed and manufactured compact permanent quadrupole magnets providing magnetic field gradient up to 510 T/m at an aperture radius of only of a few mm. The Halbach-type quadrupole magents use 12 NdFeB wedges with a remanent magnetic field of 1.2 Tesla. We measured the magnetic field of the permanent magnet quadrupoles using the pulsed-wire and rotating-coil methods. Here, we present an analysis of the magnetic field quality and, in particular, the integrated field gradient and high-order field components. We further discuss the influence of the field imperfections on the electron beam quality and its consequences for application in the transport line of a laser-plasma-driven undulator X-ray source.

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THPIK027

Dynamic Behaviour of Fast-Pulsed Quadrupole Magnets for LINAC4 Transfer Line

linac, flattop, target, sextupole

4150

S. Kasaei
IPM, Tehran, Iran
M.C.L. Buzio, L. Fiscarelli
CERN, Geneva, Switzerland

Linac4, recently built at CERN, is a linear normal conducting accelerator for negative hydrogen ions (H⁻). A new transfer line will link Linac4 to the Proton Synchrotron Booster. This transfer line includes 21 quadrupole magnets characterized by fast excitation cycles, which make accurate magnetic measurements challenging. This paper describes the method used for the measurement, which is a combination of techniques based on rotating and fixed search coils. We show how these instruments can be used in a complementary way to derive information on different aspects of the magnetic behaviour of these quadrupoles, such as the impact of hysteresis and dynamic eddy current effects.

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THPIK042

The Magnetic Measurement of Conventional Magnets for Electron Beam Accelerator of Northwest Institute of Nuclear Technology

dipole, collimation, solenoid, electron

4190

Z. Zhang, L. Yang
IHEP, Beijing, People's Republic of China

The project of electron beam accelerator is worked together completed by NINT (Northwest Institute of Nuclear Technology) and IHEP (Institute of High Energy Physics, China). Conventional magnet of the project includes a total of three dipole magnets, four quadrupole magnets, six solenoid magnets, and four correction magnets. All of magnets to complete the measurement by IHEP hall measuring equipment. The integrated magnetic field measurement of the arc-shaped dipole magnet requires simultaneous movement by the X-axis and the Z-axis, using Labview software written a new measurement procedure, the new measurement procedure has been completed by setting the measuring angle and the measuring radius. All measurement results of conventional magnets have reached the physical design requirements, and each magnet were carried out more than twice the measurement, the reproducibility of the measurement results are better than one-thousandth, fully meet the design claim of NINT.

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THPIK079

Developments and Measurements Done at ALBA Magnetic Measurements Laboratory Along 2016

dipole, alignment, storage-ring, extraction

4266

J. Campmany, L.G.O. Garcia-Orta, J. Marcos, V. Massana
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Along 2016, ALBA magnetic measurements laboratory has measured magnets for a number of facilities that are being built over the world. Their measurement has been a challenge in terms of improving the methodologies of fiducialization and data analysis, since we have to accommodate to the different set of magnets characteristics and specifications. Especially relevant has been the measurement of closed structures using a conventional Hall probe bench, making the measurement in two steps and relying on alignment accuracy to merge both measurements. In this paper we enumerate the different projects in which ALBA has collaborated, and we remark the method for aligning the quadrupoles to the rotating coil, as well the methodology used to measure closed magnets in two steps with the conventional Hall probe bench.

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THPIK082

Quadrupole Magnet Design for the ESS MEBT

dipole, operation, magnet-design, linac

4276

D. Fernandez-Cañoto, I. Bustinduy, G. Harper, J.L. Muñoz, I. Rueda, S. Varnasseri
ESS Bilbao, Zamudio, Spain

Funding: Consortium ESS Bilbao
ESS Bilbao is responsible for the design and fabrication of the ESS MEBT as an In-Kind contribution. The MEBT includes a focusing lattice with 11 quadrupole magnets with different operational gradients, but fabricated from the same model to simplify manufacturing and save costs. The magnet is designed with a 20.5 mm aperture radius to generate focusing fields of up to 2.74 T and also includes two additional steering coil systems assembled around yoke return arms to produce vertical and horizontal dipole fields up to 20 G·m. The magnet model, which fabrication starts in 2017, is here introduced. Magnetic, thermoelectric and dimensional studies are performed and results compared to specifications. Suitable transfer functions for magnet operation and magnetic fields for a doublet system with a BCM magnetically shielded placed between the two magnets are presented.

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THPIK092

Considerations on the Effect of Magnet Yoke Dilution on Remanent Field at ELENA

antiproton, simulation, dipole, multipole

4299

C. Carli, L. Fiscarelli, D. Schoerling
CERN, Geneva, Switzerland

The Extra Low Energy Antiproton ring (ELENA) is a small synchrotron constructed at CERN to decelerate antiprotons down to 100 keV and, thus, operated at very low magnetic fields. The CERN magnet group has carried out extensive investigations on accelerator magnets for very low fields, comprising theoretical studies and the construction of several prototype magnets, to ensure that the required field quality can be reached at these very low fields. In the course of this work, experimental investigations [1] led to the initially unexpected observation that dilution of the yoke, i.e. alternating laminations made of electric steel with thicker non-magnetic stainless steel laminations, increases the remnant field. An explanation for this behaviour has already been anticipated in a previous paper [2]. Here, we treat this specific topic in analytical detail. We come to the conclusion that magnet yoke thinning in most practical situations does not improve the field quality at very low field levels, but rather enhances the impact from hysteresis and remanence effects.
[1] L.Fiscarelli, Magnetic measurements on the quadrupoles prototypes for ELENA (PXMQNLGNAP), CERN internal report.
[2] D. Schoerling, Case Study of a Magnetic System for low-Energy Machines, PRAB 19, 082401 (2016).

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THPIK104

Transient Simulation of the ISIS Synchrotron Singlet Quadrupoles Using OPERA 3D

simulation, synchrotron, software, proton

4334

I. Rodríguez
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

Type QX10⁶ singlet magnets are AC defocusing quadrupoles used in the ISIS main synchrotron ring. They have an aperture of 202 mm and a yoke length of 303 mm, so the end effects are significant. The iron poles and the yoke are asymmetric and the coils are driven by a 50Hz, 400 A AC current, biased with a DC current of 665 A. Therefore the yoke has to be laminated, and the laminations are slitted up to a depth of 90 mm on each side to further reduce the eddy current losses. Two 3D models (DC and transient) have been developed using OPERA 3D for different purposes. Both models require the use of an anisotropic BH curve for the yoke, and the transient model also requires an anisotropic conductivity and a prismatic/hexahedral mesh to overcome the limitations of the linear tetrahedral edge elements in OPERA's vector potential formulation. The quadrupole field quality was originally measured in 1982 with a DC excitation at the biased peak current (1065 A) and those measurements are now compared to both models. The iron losses due to the eddy currents are also presented and compared to the original specifications defined in 1980, as well as an estimation of the eddy currents in the coils.

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THPIK105

The ZEPTO Dipole: Zero Power Tuneable Optics for CLIC

dipole, permanent-magnet, target, collider

4338

A.R. Bainbridge, J.A. Clarke, B.J.A. Shepherd
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
N.A. Collomb
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
M. Modena
CERN, Geneva, Switzerland

Permanent magnet (PM) based systems create a significantly reduced power consumption compared to conventional room temperature electromagnets. STFC and CERN are investigating the feasibility of using tuneable PM systems to reduce high electricity and water-cooling costs; plus the associated large scale infrastructure burden in the proposed CLIC accelerator. This collaboration has previously resulted in the development of two tuneable PM Quadrupole systems. We present here a continuation of this work in the development of a pure PM C-Dipole with a tuning range of over 50%. A prototype has been simulated and constructed using a single 50x40x20 cm block of NdFeB which slides horizontally to provide tuning. We outline the design, construction and measurement of a prototype dipole and discuss its suitability as a replacement for electromagnetic systems. Issues including field homogeneity over a large tuning range and the management of high magnetic forces are addressed.

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THPIK108

Bead Pull Measurements of the FETS RFQ at RAL

rfq, cavity, site, radio-frequency

4349

W. Promdee, T.R. Edgecock
IIAA, Huddersfield, United Kingdom
G.E. Boorman
Royal Holloway, University of London, Surrey, United Kingdom
G.E. Boorman
JAI, Egham, Surrey, United Kingdom
T.R. Edgecock, J.K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J.K. Pozimski
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

A Radio Frequency Quadrupole (RFQ) is a part of the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL), Didcot, UK. The aim of the FETS project is to produce a 60 mA H⁻ beam at 3 MeV. The RFQ is a four-vane type with 4 modules, each of 1 m length, and is designed to accelerate the beam from 65 keV to 3 MeV at 324 MHz. A bead pull system has been designed to measure the field along the RFQ. This will be used in conjunction with 64 tuners to produce a uniform field. In order to optimise the tuning procedure, a model of the RFQ has been creat-ed in COMSOL Multiphysics. This study shows the results from the bead pull measurements and the tuning studies.

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THPIK129

Non-Linear Inserts for the IOTA Ring

vacuum, electron, alignment, operation

4407

F.H. O'Shea, R.B. Agustsson, P.S. Chang, Y.C. Chen
RadiaBeam, Santa Monica, California, USA
D.W. Martin, J.D. McNevin
RadiaBeam Systems, Santa Monica, California, USA

Funding: Work supported by DOE under contract DE-SC0009531.
We present here the complete non-linear insert for the IOTA ring at Fermilab. In particular, we will show the results for the magnetic measurements and a discussion of leak correction in the unusually shaped vacuum chamber. A test assembly of the insert has been successfully completed and the insert functions mechanically as designed.

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THPVA003

Status of the Beam Dynamics Design of the New Post-Stripper DTL for GSI-FAIR

DTL, emittance, simulation, ion

4414

A. Rubin, X. Du, L. Groening, M. Kaiser, S. Mickat
GSI, Darmstadt, Germany

The GSI UNILAC has served as injector for all ion species since 40 years. Its 10⁸ MHz Alvarez DTL providing acceleration from 1.4 MeV/u to 11.4 MeV/u has suffered from material fatigue and has to be replaced by a new section. The design of the new post-stripper DTL is now under development in GSI. Five Alvarez tanks with four intertank sections provide 100% transmission and low emittance growth. The intertank sections allow for a matched solution and provide place for diagnostics. Simulations along the complete Alvarez DTL were done for 238U²⁸⁺ using the TraceWin code. The transversal zero current phase advance is 65' for all tanks. Results of beam dynamics simulations for six different scenarios as well as an error study for the FAIR nominal case are presented.

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THPVA040

Magnetic Field Computation for PMTs Shielding Optimization

shielding, simulation, experiment, photon

4522

E. Bouquerel, O. Dorvaux, S. Kihel, M. Krauth, P. Peaupardin
IPHC, Strasbourg Cedex 2, France
C. Ciemala
IFJ-PAN, Kraków, Poland

The Photon Array for the studies of Radioactive and Ion Stable beams (PARIS) is a multidetector of clusters. Each cluster is composed of 9 units of two-shells phoswiches of LaBr3/NaI scintillators optically coupled to one photomultiplier tube. PARIS will be used in combination with the VAMOS spectrometer at GANIL. During the experiment, PMTs will be exposed to the constant magnetic fringe fields produced by a quadrupole. Magnetic shielding is essential to efficiently lower the magnetic field inside the PMTs. The design and the optimization of this shield is presented. A comparison is done between the simulated and the experimental values.

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THPVA046

Thermo Mechanical Study of the ESS DTL

DTL, simulation, feedback, linac

4537

P. Mereu, M. Mezzano, C. Mingioni, M. Nenni
INFN-Torino, Torino, Italy
F. Grespan, A. Palmieri, A. Pisent
INFN/LNL, Legnaro (PD), Italy

The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2 MHz with a duty cycle of 4 % (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5 mA pulse peak current from 3.62 to 90 MeV. In this paper the main issues regarding the thermo-mechanical 3D details of the DTL are addressed and a Computational Fluid Dynamics (CFD) model is proposed and validated against the experimental data. The results of these simulations are used to properly design the DTL cooling system.

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THPVA048

Design and Progress on Mechanical & Alignment System for HEPS-TF

alignment, controls, sextupole, emittance

4544

C. H. Li, S.J. Li, J. Liu, H. Wang, X.L. Wang, Z. Wang, L. Wu
IHEP, Beijing, People's Republic of China

HEPS is a new generation synchrotron facility with a stringent requirement of very low emmittance. The key technology difficulties are supposed be overcome during the HEPS-TF stage. There are two projects in progress for mechanical and alignment system. One is the development of precision auto-tuning magnet girder, to meet the requirement of beam based alignment in tunnel, the other is the study on vibrating-wire alignment technique to improve alignment accuracy of magnets on a girder. This paper will describe the design and progress of both projects.

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THPVA051

Vibration Study of Magnet Girder of the HEPS-TF

photon, experiment, factory, emittance

4554

Z. Wang, C. H. Li, H. Qu, H. Wang
IHEP, Beijing, People's Republic of China

Abstract: There are stringent requirements on beam stability in the High Energy Photon Source (HEPS). The stability of the magnet girder is an extremely important factor for the beam stability. This paper will discuss the influence of ground vibration to the beam stability. This influence will determine the scope of the vibration magnification of the magnet girder. By improving the stiffness of the magnet girder, the influence will be reduced and the beam stability shall be improved. Besides, the progress of the HEPS-TF girder prototype and the vibration test will be described.

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THPVA052

Preliminary Design of Magnet Support System for CEPC

booster, dipole, collider, sextupole

4557

H. Wang, H. Qu, J.L. Wang, Z. Wang, N. Zhou
IHEP, Beijing, People's Republic of China

Magnet support system is important for CEPC. For the 100 km design of CEPC, there will be thousands of mag-nets and their supports in both collider and booster. Espe-cially, the booster ring is above the collider in the space, the magnets are hung by the supports. The goals of mag-net supports are simple and flexible structure, minimizing the magnet deformation, good stability, low cost and so on. This paper will describe the preliminary design of magnet support system, the optimization to minimize the magnet deformation and the topology optimization of the frame structure in booster.

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THPVA056

Study of Influence of Dipole and Quadrupole Power Ripple on Slow Extraction for XiPAF

extraction, simulation, dipole, resonance

4569

Q. Zhang, G.R. Li, Z.Y. Lin, X.W. Wang, H.J. Yao, S.X. Zheng
TUB, Beijing, People's Republic of China
X. Guan
Tsinghua University, Beijing, People's Republic of China

The 3rd resonant slow extraction and RF-Knockout technology has been adopted for XiPAF, which was designed for proton therapy and single event effects. The separatrix of stable region will fluctuate in the process of slow extraction due to power ripple, hence influence the uniform of extracted beam and the extraction efficiency. The influence of dipole and quadrupole power ripple is studied in theory and simulated by a MPI parallel multi-particle program, a method of making beam less sensitive to power ripple is discussed and verified by simulation.

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THPVA060

Technical Overview of Inter-Undulator Support System for PAL XFEL

undulator, cavity, controls, feedback

4579

H.-G. Lee, S.-H. Jeong, Y.G. Jung, H.-S. Kang, D.E. Kim, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

Pohang Accelerator Laboratory (PAL) has been developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. The inter-Undulator (IU) support system was developed to be used in the intersections of the Undulator Systems. The IU supports consist of phase shifter, quadrupole magnet with mover, beam loss monitor, cavity BPM with mover, two corrector magnets and vacuum components. The adjusting mechanism of IU Support has manual alignment system to be easily adjusting the component. The mover of quadruple magnet and cavity BPM with submicron repeatability has auto-adjusting systems with stepping motor. The mover main specifications include compact dimensions and a ±1.5 mm stroke in the vertical and horizontal direction. Linear motion guide based on 5-phase stepping motors have been chosen. This paper describes the design of the stages used for precise movement and results of mechanical measurements including reproducibility will be reported.

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THPVA069

NSC KIPT Experience in Use of Laser Tracker Leica at 401 in Equipment Alignment of 100 MeV/100 KW Electron Linear Accelerator of Neutron Source Driver

target, survey, neutron, electron

4604

M. Moisieienko, O. Bezditko, I.M. Karnaukhov, A. Mytsykov, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine

For successful operation of electron linear accelerator that is driver of NSC KIPT Neutron source it is necessary that all the acceleration sections and all the electromagnetic elements should be installed in design position according to the designed lattice. Accuracies of all electromagnetic elements installation are 150 mkm in transverse positions and 200 mrad for all three rotation directions. The whole process, fiducialization and developing of coordinate net, is controlled by Laser tracker Leica AT 401. Well-planned methods allow to realize uniform irradiation of neutron-generation target.

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THPVA074

Upgrade Study of the MedAustron Ion Beam Center

extraction, ion, betatron, synchrotron

4619

A. De Franco, T.T. Böhlen, F. Farinon, G. Kowarik, M. Kronberger, C. Kurfürst, S. Nowak, F. Osmić, M.T.F. Pivi, C. Schmitzer, P. Urschütz, A. Wastl
EBG MedAustron, Wr. Neustadt, Austria

Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sk'odowska-Curie grant agreement No 675265.
MedAustron is a synchrotron-based ion beam therapy center allowing the treatment of tumours with protons and other light ion species, in particular C⁶⁺. Commissioning of the first irradiation room for clinical therapy with proton beams has been completed and in parallel to the commissioning of the remaining two irradiation rooms, a facility upgrade study has started. Our analysis includes considerations for the possibility to introduce different extraction mechanisms, new diagnostic tools, optimization of the accelerator cycle time, ripples mitigation for more accurate active beam stabilization and other improvements for hardware reliability. We present the concept, the main benefits, also in terms of treatment time reduction, and the challenges for implementation. Each option will be investigated including a detailed assessment on resources demand, impact and risk analysis.

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THPVA076

Overview and Status of the MedAustron Ion Therapy Center Accelerator

proton, ion, extraction, synchrotron

4627

M.T.F. Pivi, A. De Franco, F. Farinon, M. Kronberger, C. Kurfürst, S. Myalski, S. Nowak, F. Osmić, C. Schmitzer, P. Urschütz, A. Wastl
EBG MedAustron, Wr. Neustadt, Austria
T.K.D. Kulenkampff
CERN, Geneva, Switzerland
L.C. Penescu
Abstract Landscapes, Montpellier, France

The synchrotron-based MedAustron accelerator in Wiener Neustadt, Austria, has seen the first clinical beam and has been certified as a medical accelerator in December 2016. This represented a major milestone for the facility whose original design originated more than a decade ago and construction started four years ago. The accelerator is designed to deliver clinical proton beams 60-253 MeV and carbon ions 120-400 MeV/u to three ion therapy irradiation rooms (IRs), including a room with a proton Gantry. Beams up to 800 MeV will be provided to a fourth room dedicated to non-clinical research. Presently, proton beams are delivered to the horizontal beam lines of three irradiation rooms. In parallel, commissioning of the accelerator with Carbon ions and the installation of the Gantry beam line are ongoing. At MedAustron, a third-order resonance extraction method is used to extract particles from the synchrotron in a slow controlled process over a spill time of 0.1-10 seconds to facilitate the measurement and control of the delivered radiation dose during clinical treatments. The main characteristics of the accelerator and the results obtained during the commissioning are presented.

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THPVA128

Preliminary Test Setup of the Metu Defocusing Beam Line, an Irradiation Test Facility in Turkey

proton, detector, vacuum, target

4750

A. Gencer, S. Akçelik, A. Avaroğlu, M.S. Aydın, G. Kılıçerkan Başlar, B. Bodur, B.M. Demirköz, U. Kılıç, E. Özipek, I. Sahin, R. Uzel, D. Veske, M. Yigitoglu
Middle East Technical University, Ankara, Turkey
I. Efthymiopoulos, A. Milanese
CERN, Geneva, Switzerland

Funding: Turkish Ministry of Development
METU-Defocusing Beam Line (METU-DBL) Project has been started in August 2015 and aims to construct a beam line at Turkish Atomic Energy Authority Sarayköy Nuclear Education and Research Center Proton Accelerator Facility to perform Single Event Effect (SEE) tests for the first time in Turkey. The METU-DBL is 8m-long and has quadrupole magnets to enlarge the beam size and collimators to reduce the flux. When complete the METU-DBL will provide a beam that is suitable according to ESA ESCC No. 25100 Single Event Effects Test Method and Guidelines standard. The METU-DBL beam size is 15.40cm x 21.55cm and the flux will be variable between 10⁵ p/cm²/s and 10¹⁰ p/cm²/s. The METU-DBL will serve space, particle, nuclear and medical physics communities starting from 2018 with performing irradiation tests. A preliminary test setup is being constructed towards first tests in March 2017. The beam size will be 6cm x 8cm and the flux will be 1.4x10⁹ p/cm²/s for preliminary test setup. The METU-DBL project construction status for the preliminary test setup is presented in this poster.

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THPVA140

Superconducting Gantry Design for Proton Tomography

proton, dipole, linac, optics

4795

E. Oponowicz, H.L. Owen
UMAN, Manchester, United Kingdom

Precise proton therapy planning can be assisted by augmenting conventional medical imaging techniques with proton computed tomography (pCT). For adults this requires an incident proton energy up to around 330 MeV, requiring superconducting magnets if an imaging gantry is to replace a conventional 230-250 MeV gantry in the same space. Here we present optics considerations for a superconducting gantry to deliver 330 MeV protons within the context of the future Christie Hospital proton therapy centre, where it is proposed to increase the proton energy in the future with a booster linac.

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THPVA151

Halbach Magnets for CBETA and eRHIC

permanent-magnet, simulation, electron, proton

4814

H. Witte, J.S. Berg, B. Parker
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
At Brookhaven National Laboratory two design efforts are underway: eRHIC and CBETA. eRHIC is a proposed upgrade to the existing Relativistic Heavy Ion Collider (RHIC), which would allow collisions of up to 21 GeV polarized electrons with protons or heavy ions. CBETA is a 150 MeV electron accelerator, aiming to demonstrate essential technology necessary for eRHIC. Both machines employ FFAG arcs and are designated to use permanent magnet material for the required quadrupole magnets. One proposed design is a Halbach magnet; this paper investigates the feasibility of this approach.

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