LINAC2016 - List of Keywords (emittance)

Paper	Title	Other Keywords	Page
MO2A04	Low Emittance and High Current Electron Linac Development at Tsinghua University	gun, electron, laser, experiment	17
	C.-X. Tang, H.B. Chen, Z.J. Chi, Y.-C. Du, W.-H. Huang, J. Shi, Q.L. Tian, D. Wang, W. Wang, L.X. Yan, Z. Zhang, Z. Zhang, L.M. Zheng, Z. Zhou TUB, Beijing, People's Republic of China
	A 50MeV electron linac have been developed in Tsinghua University, which consists of a 1.6Cell photocathode rf gun, a 3-meter s-band SLAC type traveling wave (TW) accelerating structure an a s-band TW buncher. The photocathode rf gun is working at 120MV/m, 2856MHz, with very small dark current. The emittance of the electron beam is less than 1mm.mrad at 500pC, and 0.5mm.mrad at 200pC. The linac is designed for Tsinghua Thomson scattering X-ray source (TTX), and 2x10⁷ photon/bunch at 50keV has been got and some application experiments with the x-ray have been carried out. The new photocathode rf gun and x-band high gradient accelerating structure development will also be introducted in this talk.
	Slides MO2A04 [11.413 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MO2A04
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MOPRC013	Tracking Based Courant-Snyder Parameter Matching in a Linac with a Strong Space-Charge Force	linac, DTL, space-charge, quadrupole	93
	R. Miyamoto ESS, Lund, Sweden
	During the design of a hadron linac, matching at the interfaces of different structures or lattice periods is often performed with the linear approximation of the space-charge force. When space-charge is extremely strong, like in the low energy part of the proton linac of the European Spallation Source, such a matching method is not always good enough and could lead to a residual mismatch at the design level. To avoid this, a matching scheme based on iterations of tracking, thus including the full effect of the space-charge force, is developed. This paper presents the scheme itself as well as its application to the ESS linac.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC013
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MOPRC017	CIADS HEBT Lattice Design	target, vacuum, collimation, lattice	108
	Y.S. Qin IMP/CAS, Lanzhou, People's Republic of China
	Funding: I want to apply for financial support. CIADS (China Initiative Accelerator Driven System) 600MeV HEBT (High-Energy Beam Transport) will deliver 6 MW beam to the target, with CW (continuous wave) 10 mA beam. The most serious challenges are vacuum differential section and beam uniformization on the target. A novel collimation plus vacuum differential section is proposed in the lattice design. A scanning method is designed for the round beam uniformization on the target.
	Poster MOPRC017 [1.273 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC017
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MOPRC023	Semi-3D Beam-Tracking Code for Electron Injectors Using Bulk-to-Point Calculation Technique for Space Charge Fields	space-charge, electron, simulation, gun	120
	A. Mizuno, H. Hanaki JASRI/SPring-8, Hyogo-ken, Japan
	A new semi-three-dimensional beam-tracking simulation code for electron injectors using bulk-to-point calculation technique for space charge fields is developed. The calculated space charge fields are not produced by a point charge but a doughnut which has the volume and whose cross-section is ellipsoid. Since the calculation noise which is usually caused by distributions of positions of point charge can be minimized, high accuracy calculation on emittance is realized with small number of electrons. Simultaneously, the calculation time becomes markedly shortened. In this paper, calculation examples for asymmetrical beams are demonstrated by the new code. The accuracy of emittance is also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC023
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MOPLR005	Design, Manufacturing and Installation of Two Dual-Feed Accelerating Structures for the FERMI Injector	linac, cavity, accelerating-gradient, FEL	139
	C. Serpico, A. Fabris, G. Penco, M. Svandrlik Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy B. Keune RI Research Instruments GmbH, Bergisch Gladbach, Germany
	FERMI is a seeded Free Electron Laser (FEL) driven by a warm S-band Linac. In the injector region, two 3- meter long Forward Traveling Wave (FTW) accelerating structures, coming from the old Elettra injector, were installed. In order to improve the e-beam quality at higher bunch charge, it was decided to replace the existing ones with two dual-feed accelerating structures. Those structures have been designed and manufactured by RI Research Instruments GmbH and delivered to Elettra in July 2015. The following paper will report about the RF design and the manufacturing of the new structures. Details about the RF conditioning and the installation will also be illustrated.
	Poster MOPLR005 [1.100 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR005
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MOPLR008	Status Of the ILC Main Linac Design	linac, lattice, cryomodule, quadrupole	149
	A. Saini, V.V. Kapin, N. Solyak Fermilab, Batavia, Illinois, USA
	International Linear collider (ILC) is a proposed accelerator facility which is primarily based on two 11-km long superconducting main linacs. In this paper we present recent updates on the main linac design and discuss changes made in order to meet specification outlined in the technical design report (TDR).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR008
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MOPLR059	Commissioning Plans for the ESS DTL	DTL, linac, diagnostics, proton	264
	M. Comunian, L. Bellan, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy M. Eshraqi, R. Miyamoto ESS, Lund, Sweden
	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% (a beam pulse of 2.86 ms, 14 Hz repetition period) and will accelerate a proton beam of 62.5 mA pulse peak current from 3.62 to 90 MeV. This article describes the commissioning strategy plans for the DTL part of the linac, techniques for finding the RF set-point of the 5 tanks and steering approach. Typical beam parameters, as proposed for commissioning purposes, are discussed as well and how the commissioning sequence of the tanks fits together with ongoing installation works in the tunnel.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR059
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MOPLR060	CIADS Normal Temperature Front-End Design	rfq, proton, ion, ion-source	267
	W.L. Chen, W.P. Dou, Y. He, H. Jia, S.H. Liu, Y.S. Qin, Z.J. Wang IMP/CAS, Lanzhou, People's Republic of China
	The design and construction with several tens of megawatts superconducting accelerator is the developing direction in the further. The superconducting section follows the RFQ and MEBT, which needs good enough beam quality. The normal temperature front ends are redesigned for China Initiative ADS. The LEBT transports a 35KeV, 10mA DC proton beam to the RFQ, after the RFQ acceleration the MEBT transports a 2.1MeV 10mA CW proton beam to the superconducting DTL. The "Point Source" is proposed in the beam scrape application during the LEBT section to get the ideal transverse beam parameters. To get the ideal longitudinal beam parameters, the new RFQ is designed with little emittance. Collimators are installed in the new MEBT to scrape the outer sphere beams which may turn to halo. Details of the beam dynamics simulations will be given.
	Poster MOPLR060 [1.109 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR060
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MOPLR069	Implication of Manufacturing Errors on the Layout of Stabilization System and on the Field Quality in a Drift Tube Linac - RF DTL Error Study	DTL, linac, simulation, drift-tube-linac	290
	R. De Prisco, A.R. Karlsson Lund University, Lund, Sweden M. Eshraqi, Y.I. Levinsen, R. Miyamoto ESS, Lund, Sweden
	The field flatness and the layout of the stabilization system in a drift tube linac are strongly dependent on the manufacturing errors that affect the local resonant frequency. In this paper a methodology is presented to study, firstly, the sensitivity of the resonant frequency and of the field flatness to each geometrical parameter of the drift tubes; then a set of tolerances for each parameter is found and a stabilization system layout is defined in order to keep the field flatness within an acceptable limit.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR069
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TU1A03	Experience with the Construction and Commissioning of Linac4	linac, ion, DTL, cavity	342
	J.-B. Lallement CERN, Geneva, Switzerland
	In the framework of the LHC Injector Upgrade program, CERN is presently commissioning Linac4, a 160MeV H⁻ ion linac, which will replace the present 50 MeV proton linac (Linac2) as injector to the PS Booster during the next LHC long shut-down. The installation of the machine has proceeded in parallel with a staged beam commissioning at the energies of 3, 12, 50, 100 MeV and finally 160 MeV, foreseen for fall 2016. A seven month long reliability run will take place during 2017 to access potential weak points and find mitigations. The lessons learnt during its construction, the main outcomes of the beam commissioning and the remaining steps toward its connection to the PS Booster are presented in this paper.
	Slides TU1A03 [5.747 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TU1A03
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TUOP03	Developments on the 1.4 MeV/u Pulsed Gas Stripper Cell	ion, target, heavy-ion, linac	387
	P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev HIM, Mainz, Germany W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev GSI, Darmstadt, Germany Ch.E. Düllmann, P. Scharrer Mainz University, Mainz, Germany
	The GSI UNILAC in combination with SIS18 will serve as a high-current, heavy-ion injector for the FAIR facility. It must meet high demands in terms of beam brilliance at a low duty factor. As part of an UNILAC upgrade program dedicated to FAIR, a new pulsed gas stripper cell was developed, aiming for increased beam intensities inside the post-stripper. The pulsed gas injection is synchronized with the beam pulse timing, enabling a highly-demanded, increased gas density. First tests using uranium beams on a hydrogen target showed a 60%-increased stripping efficiency into the desired 28+ charge state. In 2015, the setup was improved to be able to deliver increased target thicknesses and enhanced flexibility of the gas injection. In recent beam times, the pulsed gas cell was used with various ion-beam types, to test the capabilities for operation at the GSI UNILAC. The stripping of two ion beams in different gases at different gas densities was successfully tested in mixed-beam operation. Charge fractions, beam emittance, and energy-loss were systematically measured using uranium, bismuth, titanium, and argon beams on hydrogen, helium, and nitrogen targets. Selected results will be presented at the conference.
	Slides TUOP03 [1.131 MB]
	Poster TUOP03 [5.943 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP03
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TUPRC002	ESS DTL Beam Dynamics Comparison Between S-Code and T-Code	DTL, simulation, software, linac	411
	M. Comunian, L. Bellan, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy L. Bellan Univ. degli Studi di Padova, Padova, 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 DTL beam dynamics comparison between the s-code TraceWin and the t-code Parmela is presented. Full field map of the permanent magnet quadrupoles (with COMSOL) and RF fields of each of the 5 tanks (with MDTFish) were used for the two programs.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC002
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TUPRC003	Effect of Number of Macro Particles on Time Evolution of Phase Space Distribution	electron, simulation, linac, operation	414
	T. Miyajima KEK, Ibaraki, Japan
	Funding: This work was supported by JSPS KAKENHI Grant Number 26600147. In particle tracking simulation with space charge effect, the macro-particle model, which has same mass-to-charge ratio, is widely used, since it does not require any symmetry of beam shape. However, selection of proper number of macro-particles is important, because the accuracy depends on it. Emittance, which is calculated by phase-space distribution, is especially affected by the number of macro-particles. In order to study the relation between the number of macro-particles and the resolution in the phase space, we defined a transformation, which describes reduction process of macro-particle number, and analyzed static phase space distribution. As a next step, we studied the effect of the macro-particle number on the dynamics of the phase space distribution for 1D charged particle distribution in the rest frame. The numerical result shows that the number of macro-particles affected the phase space distribution around the head and the tail of the bunch. * T. Miyajima, "Effect of number of macro particles in phase space distribution", in Proc. of IPAC2015, Richmond, VA, USA, pp.242-244 (2015).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC003
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TUPRC005	Source and LEBT Beam Preparation for IFMIF-EVEDA RFQ	rfq, solenoid, simulation, injection	420
	L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy P.-Y. Beauvais, B. Bolzon, N. Chauvin CEA/DSM/IRFU, France L. Bellan Univ. degli Studi di Padova, Padova, Italy P. Cara Fusion for Energy, Garching, Germany H. Dzitko F4E, Germany R. Gobin, F. Senée CEA/DRF/IRFU, Gif-sur-Yvette, France R. Ichimiya, A. Kasugai, M. Sugimoto JAEA, Aomori, Japan A. Marqueta, F. Scantamburlo IFMIF/EVEDA, Rokkasho, Japan
	The commissioning phase of the IFMIF-EVEDA RFQ requires a complete beam characterization with simula-tions and measurements of the beam input from the IFMIF-EVEDA ion source and LEBT, in order to reach the RFQ input beam parameters. In this article, the simula-tions results of the complex source-LEBT with the corre-sponding set of measurements and their impact on the commissioning plan will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC005
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TUPRC011	Ongoing Studies of the SuSI ECR Ion Source and Low Energy Beam Transport Line at the MSU NSCL	ion, extraction, ion-source, plasma	438
	A.N. Pham, J. Fogleman, D. Leitner, G. Machicoane, D.E. Neben, S. Renteria, J.W. Stetson, L. Tobos NSCL, East Lansing, Michigan, USA
	Funding: Research supported by Michigan State University and National Science Foundation Award PHY-1415462. Heavy ion accelerator laboratories for nuclear science and rare isotope research require a wide array of high intensity heavy ion beams. Due to their versatility and robustness, Electron Cyclotron Resonance (ECR) ion sources are the choice injectors for the majority of these facilities worldwide. Steady improvements in the performance of ECR ion sources have been successful in providing intense primary beams for facilities such as the National Superconducting Cyclotron Laboratory (NSCL). However, next generation heavy ion beam laboratories, such as the Facility for Rare Isotope Beam (FRIB), require intensities that approaching the limits of current possibility with state of the art ion source technology. In this proceedings, we present the ongoing low energy beam transport characterization efforts of a superconducting ECR ion source injector system at the MSU NSCL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC011
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TUPRC016	S-Band Booster Design and Emittance Preservation for the Awake e-Injector	linac, plasma, electron, booster	449
	O. Mete Apsimon, R. Apsimon, G. Burt Cockcroft Institute, Lancaster University, Lancaster, United Kingdom S. Döbert CERN, Geneva, Switzerland G.X. Xia UMAN, Manchester, United Kingdom
	AWAKE is a proton driven plasma wakefield acceleration experiment at CERN which uses the protons from the SPS. It aims to study the self modulation instability of a proton bunch and the acceleration of an externally injected electron beam in the plasma wakefields, during the so called Phase II until the technical stop of LHC and its injector chain (LS2) in 2019. The external electron beam of 0.1 to 1nC charge per bunch will be generated using an S-band photo injector with a high QE semiconducting cathode. A booster linac was designed to allow variable electron energy for the plasma experiments from 16 to 20 MeV. For an RF gun and booster system, emittance control can be highlighted as a challenging transmission task. Once the beam emittance is compensated at the gun exit and the beam is delivered to the booster with an optimum beam envelope, fringing fields and imperfections in the linac become critical for preserving the injection emittance. This paper summarises the rf design studies in order to preserve the initial beam emittance at the entrance of the linac and alternative mitigation schemes in case of emittance growth.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC016
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TUPRC020	The TRIUMF ARIEL RF Modulated Thermionic Electron Source	electron, cathode, TRIUMF, target	458
	F. Ames, Y.-C. Chao, K. Fong, N. Khan, S.R. Koscielniak, A. Laxdal, L. Merminga, T. Planche, S. Saminathan, D.W. Storey TRIUMF, Vancouver, Canada Y.-C. Chao, L. Merminga SLAC, Menlo Park, California, USA C.K. Sinclair Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: ARIEL is funded by the Canada Foundation for Innovation, the Provinces AB, BC, MA, ON, QC, and TRIUMF. TRIUMF receives funding via a contribution agreement with the National Research Council of Canada Within the ARIEL (Advanced Rare IsotopE Laboratory) at TRIUMF, a high power electron beam is used to produce radioactive ion beams via photo-fission. The electron beam is accelerated in a superconducting linac up to 50 MeV. The electron source provides electron bunches with charge up to 16 pC at a repetition frequency of 650 MHz leading to an average current of 10 mA . The kinetic energy of the electrons has been chosen to be 300 keV to allow direct injection into an accelerator cavity. The main components of the source are a gridded dispenser cathode (CPI 'Y845) in an SF6 filled vessel and an in-air HV power supply. The beam is bunched by applying DC and RF fields to the grid. Unique features of the gun are its cathode/anode geometry to reduce field emission, and transmission of RF modulation via a dielectric (ceramic) waveguide through the SF6. The latter obviates the need for an HV platform inside the vessel to carry the RF generator and results in a significantly smaller/simpler vessel. The source has been installed and first tests with accelerated beams have been performed. Measurements of the beam properties and results from the commissioning of the source will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC020
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TUPLR070	Efficient Heavy Ion Acceleration with IH-Type Cavities for High Current Machines in the Energy Range up to 11.4 MeV/u	linac, DTL, simulation, cavity	616
	H. Hähnel, U. Ratzinger, R. Tiede IAP, Frankfurt am Main, Germany
	Funding: BMBF 05P15RFRBA We propose an efficient design for heavy ion acceleration from 1.4 to 11.4 MeV/u with a design current of 15 emA for a Uranium 28+ beam. The proposed linac is based on IH-DTL cavities and quadrupole triplet focusing. The KONUS beam dynamics concept is used to achieve high acceleration efficiency. By optimization of the transversal focusing scheme and the longitudinal bunch center motion, low emittance growth for the entire linac is achieved. Beam dynamics simulations were performed along with 3D rf-simulations of all cavities. The cavities are designed for 10⁸.408 MHz, reaching an effective shunt impedance of 100-200 MOhm/m. The overall length of the linac is below 25 m. A mechanical realization concept employing a modular tank design is presented. The proposed design is a viable option for the GSI UNILAC poststripper linac replacement, leaving free space in the UNILAC tunnel for future energy upgrades.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR070
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TH1A03	Development of New Heavy Ion Linacs at GSI	linac, DTL, ion, solenoid	688
	L. Groening, S. Mickat GSI, Darmstadt, Germany
	The heavy ion linac UNILAC at GSI will be upgraded in order to meet the beam requirements imposed by the upcoming FAIR facility. This upgrade includes several innovative techniques and applications. They comprise a new gaseaous stripper with enhanced efficiency, full 4d transverse emittance measurements, a round-to-flat beam adaptor, asymmetric transverse focusing along the new Alvarez DTL, optimized shape of the drift tube surface w.r.t. shunt impedance per surface field, and a field stabilization and tuning scheme without post-couplers. Additionally, we report on development of a super-conducting cw linac for intermediate mass ions which will be dedicated to production of super heavy elements close to the Coulomb barrier.
	Slides TH1A03 [3.016 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A03
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TH2A02	Results From the Laserwire Emittance Scanner and Profile Monitor at CERN's Linac4	laser, detector, electron, linac	715
	T. Hofmann, U. Raich, F. Roncarolo CERN, Geneva, Switzerland G.E. Boorman, A. Bosco, S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom G.E. Boorman, A. Bosco, S.M. Gibson JAI, Egham, Surrey, United Kingdom
	A novel, non-invasive, H⁻ laser-wire scanner has been tested during the beam commissioning of CERN's new Linac4. Emittance measurements were performed at beam energies of 3 and 12 MeV with this new device and were found to closely match the results of conventional slit-grid methods. In 2015, the configuration of this laser-wire scanner was substantially modified. In the new setup the electrons liberated by the photo-detachment process are deflected away from the main beam and focused onto a single crystal diamond detector that can be moved in order to follow the laser beam scan. The beam profiles measured with the new laser-wire setup at 50 MeV, 80 MeV and 10⁷ MeV are in good agreement with the measurements of nearby SEM grids and wire-scanners. The design of the final laser-wire scanner for the full 160 MeV beam energy will also be presented. In Linac4 two independent laser-wire devices will be installed in the transfer line to the BOOSTER ring. Each device will be composed of two parts: one hosting the laser-wire and the electron detector and the second hosting the segmented diamond detector used to acquire the transverse profiles of the H⁰ beamlets.
	Slides TH2A02 [3.164 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH2A02
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TH2A03	Complete Transverse 4D Beam Characterization for Ions Beams at Energies of Few MeV/u	quadrupole, coupling, ion, vacuum	720
	M.T. Maier, X. Du, P. Gerhard, L. Groening, S. Mickat, H. Vormann GSI, Darmstadt, Germany
	Measurement of the ion beam rms-emittances is done through determination of the second order beam moments. For time being the moments quantifying the amount of inter-plane coupling, as <xy'> for instance, have been accessible to measurements just for very special cases of ions at energies below 200 keV/u using pepperpots. This talk presents successful measurements of all inter-plane coupling moments at 1 to 11 MeV/u. From first principles the used methods are applicable at all ion energies. The first campaign applied skewed quadrupoles in combination with a regular slit/grid emittance measurement device. The second campaign used a rotatable slit/grid device in combination with regular quadrupoles.
	Slides TH2A03 [17.343 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH2A03
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THOP12	Electron Linac Upgrade for Thomx Project	gun, linac, electron, laser	773
	L. Garolfi, C. Bruni, M. El Khaldi LAL, Orsay, France N. Faure, A. Perez Delaume PMB-ALCEN, PEYNIER, France
	The injector Linac for Thomx * consists of an electron gun and S-band accelerating section. The RF gun is a 2.5 cells photo-injector able to provide electron bunches with 5 MeV energy. During the commissioning phase, a standard S-band accelerating section is able to achieve around 50 MeV corresponding to around 45 keV X-rays energy. Since the maximum targeted X-ray energy is 90 keV, the Linac design will provide a beam energy of 70 MeV. The Linac upgrade of the machine covers many different aspects. The purpose is to increase the compactness of the accelerator complex whereas the beam properties for ring injection are kept. A LAL Orsay-PMB ALCEN collaboration has been established. The program foresees the RF design, prototyping and power tests of a high-gradient compact S-band accelerating structure. To fulfill the technical specifications at the interaction point, the Linac must be carefully designed. Beam dynamics simulations have been performed for optimizing the emittance and the energy spread for the ring entrance. The best set of parameters together with the effect of the accelerating section to the beam dynamics at the end of the LINAC will be presented. * A. Variola, et al, "The Thomx Project Status", Proceedings of IPAC2014, Dresden, Germany.
	Slides THOP12 [1.726 MB]
	Poster THOP12 [0.823 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP12
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THPRC026	Optical Design of the PI-Test MEBT Beam Scraping System	SRF, focusing, linac, space-charge	827
	A. Saini, A.V. Shemyakin Fermilab, Batavia, Illinois, USA
	PI-Test [1] is an accelerator facility under construction at Fermilab that will provide a platform to demonstrate critical technologies and concept of front-end of the PIP-II superconducting radio frequency (SRF) linac. It will be capable to accelerate an H⁻ ion beam with average current of 2 mA up to 25 MeV in continuous wave (CW) regime. To protect the SRF components from beam irradiation, the Medium Energy Beam Transport (MEBT) section of PI-Test includes an elaborated beam scraping system. It consists of four assemblies spread along the MEBT, with each assembly composed of four radiation-cooled, electrically isolated plates that can be moved into the beam in horizontal and vertical direction. The primary objectives of scraping system are to intercept particles with large transverse action and to protect the beamline elements and SRF linac in case of errors with beam focusing or steering. In this paper we formulate requirements for the scraping system and discuss factors affecting its efficiency. An optical design compatible with PI-Test MEBT is also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC026
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THPLR062	Muon Acceleration Using an RFQ	rfq, linac, experiment, acceleration	992
	Y. Kondo, K. Hasegawa JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Fukao, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, K. Shimomura KEK, Tsukuba, Japan K. Ishida RIKEN Nishina Center, Wako, Japan R. Kitamura University of Tokyo, Tokyo, Japan N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	A muon linac development for a new muon g-2 experiment is now going on at J-PARC. Muons from the muon beam line (H-line) at the J-PARC MLF are once stopped in an silica aerojel target and room temperature muoniums are evaporated from the aerogel. They are dissociated with laser (ultra slow muons), then accelerated up to 212 MeV using a linear accelerator. As the first accelerating structure, an RFQ will be used. We are planning to use a spare RFQ of the J-PARC linac for the first acceleration test. For this acceleration test, an degraded muon beam will be used instead of the ultra slow muon sourece. In this paper, present status of this muon acceleration test using the J-PARC RFQ is presented.
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FR1A02	Installation and On-Line Commissioning of EBIS at ATLAS	ion, electron, rfq, beam-transport	1022
	P.N. Ostroumov, A. Barcikowski, J.A. Clark, C. Dickerson, M.R. Hendricks, Y. Luo, R.C. Pardo, C.E. Peters, M.A. Power, G. Savard, S.I. Sharamentov, R.C. Vondrasek, G.P. Zinkann ANL, Argonne, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357. An Electron Beam Ion Source Charge Breeder (EBIS-CB) has been developed at Argonne to breed radioactive beams from the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility at ATLAS. The CARIBU EBIS-CB has been successfully commissioned offline with an external singly-charged cesium ion source. The EBIS performance meets the breeding requirements to deliver CARIBU beams to ATLAS. EBIS can provide charge-to-mass ratios >=1/7 for all CARIBU beams with breeding times in the range of 6 ms to 30 ms. A record high breeding efficiency of up to 28% into a single charge state of Cs²⁸⁺ has been demonstrated. Following the offline testing EBIS was moved to the front end of ATLAS where the alignment of EBIS was substantially improved and additional beam diagnostic tools both for electron and ion beams were installed. This paper will discuss EBIS improvements and present the results of on-line commissioning.
	Slides FR1A02 [7.717 MB]
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FR1A05	Development of a Muon Linac for the G-2/EDM Experiment at J-PARC	rfq, acceleration, linac, cavity	1037
	M. Otani, N. Kawamura, T. Mibe, F. Naito, M. Yoshida KEK, Tsukuba, Japan K. Hasegawa, Y. Kondo JAEA, Ibaraki-ken, Japan N. Hayashizaki RLNR, Tokyo, Japan T. Ito JAEA/J-PARC, Tokai-mura, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan Y. Iwata NIRS, Chiba-shi, Japan R. Kitamura University of Tokyo, Tokyo, Japan N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Precision measurements of the muon's anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective ways to test the standard model. An ultra-cold muon beam is generated from a surface muon beam by a thermal muonium production and accelerated to 300 MeV/c by a linac. The muon linac consists of an RFQ, an inter-digital IH, a Disk And Washer structure, and a disk loaded structure. The ultra-cold muons will have an extremely small momentum spread of 0.3 % with a normalized transverse emittance of around 1.5 pi mm-mrad. The design and status of the muon linac at J-PARC will be presented.
	Slides FR1A05 [13.154 MB]
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Paper

Title

Other Keywords

Page

MO2A04

Low Emittance and High Current Electron Linac Development at Tsinghua University

gun, electron, laser, experiment

17

C.-X. Tang, H.B. Chen, Z.J. Chi, Y.-C. Du, W.-H. Huang, J. Shi, Q.L. Tian, D. Wang, W. Wang, L.X. Yan, Z. Zhang, Z. Zhang, L.M. Zheng, Z. Zhou
TUB, Beijing, People's Republic of China

A 50MeV electron linac have been developed in Tsinghua University, which consists of a 1.6Cell photocathode rf gun, a 3-meter s-band SLAC type traveling wave (TW) accelerating structure an a s-band TW buncher. The photocathode rf gun is working at 120MV/m, 2856MHz, with very small dark current. The emittance of the electron beam is less than 1mm.mrad at 500pC, and 0.5mm.mrad at 200pC. The linac is designed for Tsinghua Thomson scattering X-ray source (TTX), and 2x10⁷ photon/bunch at 50keV has been got and some application experiments with the x-ray have been carried out. The new photocathode rf gun and x-band high gradient accelerating structure development will also be introducted in this talk.

Slides MO2A04 [11.413 MB]

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MOPRC013

Tracking Based Courant-Snyder Parameter Matching in a Linac with a Strong Space-Charge Force

linac, DTL, space-charge, quadrupole

93

R. Miyamoto
ESS, Lund, Sweden

During the design of a hadron linac, matching at the interfaces of different structures or lattice periods is often performed with the linear approximation of the space-charge force. When space-charge is extremely strong, like in the low energy part of the proton linac of the European Spallation Source, such a matching method is not always good enough and could lead to a residual mismatch at the design level. To avoid this, a matching scheme based on iterations of tracking, thus including the full effect of the space-charge force, is developed. This paper presents the scheme itself as well as its application to the ESS linac.

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MOPRC017

CIADS HEBT Lattice Design

target, vacuum, collimation, lattice

108

Y.S. Qin
IMP/CAS, Lanzhou, People's Republic of China

Funding: I want to apply for financial support.
CIADS (China Initiative Accelerator Driven System) 600MeV HEBT (High-Energy Beam Transport) will deliver 6 MW beam to the target, with CW (continuous wave) 10 mA beam. The most serious challenges are vacuum differential section and beam uniformization on the target. A novel collimation plus vacuum differential section is proposed in the lattice design. A scanning method is designed for the round beam uniformization on the target.

Poster MOPRC017 [1.273 MB]

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MOPRC023

Semi-3D Beam-Tracking Code for Electron Injectors Using Bulk-to-Point Calculation Technique for Space Charge Fields

space-charge, electron, simulation, gun

120

A. Mizuno, H. Hanaki
JASRI/SPring-8, Hyogo-ken, Japan

A new semi-three-dimensional beam-tracking simulation code for electron injectors using bulk-to-point calculation technique for space charge fields is developed. The calculated space charge fields are not produced by a point charge but a doughnut which has the volume and whose cross-section is ellipsoid. Since the calculation noise which is usually caused by distributions of positions of point charge can be minimized, high accuracy calculation on emittance is realized with small number of electrons. Simultaneously, the calculation time becomes markedly shortened. In this paper, calculation examples for asymmetrical beams are demonstrated by the new code. The accuracy of emittance is also discussed.

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MOPLR005

Design, Manufacturing and Installation of Two Dual-Feed Accelerating Structures for the FERMI Injector

linac, cavity, accelerating-gradient, FEL

139

C. Serpico, A. Fabris, G. Penco, M. Svandrlik
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
B. Keune
RI Research Instruments GmbH, Bergisch Gladbach, Germany

FERMI is a seeded Free Electron Laser (FEL) driven by a warm S-band Linac. In the injector region, two 3- meter long Forward Traveling Wave (FTW) accelerating structures, coming from the old Elettra injector, were installed. In order to improve the e-beam quality at higher bunch charge, it was decided to replace the existing ones with two dual-feed accelerating structures. Those structures have been designed and manufactured by RI Research Instruments GmbH and delivered to Elettra in July 2015. The following paper will report about the RF design and the manufacturing of the new structures. Details about the RF conditioning and the installation will also be illustrated.

Poster MOPLR005 [1.100 MB]

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MOPLR008

Status Of the ILC Main Linac Design

linac, lattice, cryomodule, quadrupole

149

A. Saini, V.V. Kapin, N. Solyak
Fermilab, Batavia, Illinois, USA

International Linear collider (ILC) is a proposed accelerator facility which is primarily based on two 11-km long superconducting main linacs. In this paper we present recent updates on the main linac design and discuss changes made in order to meet specification outlined in the technical design report (TDR).

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MOPLR059

Commissioning Plans for the ESS DTL

DTL, linac, diagnostics, proton

264

M. Comunian, L. Bellan, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
M. Eshraqi, R. Miyamoto
ESS, Lund, Sweden

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% (a beam pulse of 2.86 ms, 14 Hz repetition period) and will accelerate a proton beam of 62.5 mA pulse peak current from 3.62 to 90 MeV. This article describes the commissioning strategy plans for the DTL part of the linac, techniques for finding the RF set-point of the 5 tanks and steering approach. Typical beam parameters, as proposed for commissioning purposes, are discussed as well and how the commissioning sequence of the tanks fits together with ongoing installation works in the tunnel.

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MOPLR060

CIADS Normal Temperature Front-End Design

rfq, proton, ion, ion-source

267

W.L. Chen, W.P. Dou, Y. He, H. Jia, S.H. Liu, Y.S. Qin, Z.J. Wang
IMP/CAS, Lanzhou, People's Republic of China

The design and construction with several tens of megawatts superconducting accelerator is the developing direction in the further. The superconducting section follows the RFQ and MEBT, which needs good enough beam quality. The normal temperature front ends are redesigned for China Initiative ADS. The LEBT transports a 35KeV, 10mA DC proton beam to the RFQ, after the RFQ acceleration the MEBT transports a 2.1MeV 10mA CW proton beam to the superconducting DTL. The "Point Source" is proposed in the beam scrape application during the LEBT section to get the ideal transverse beam parameters. To get the ideal longitudinal beam parameters, the new RFQ is designed with little emittance. Collimators are installed in the new MEBT to scrape the outer sphere beams which may turn to halo. Details of the beam dynamics simulations will be given.

Poster MOPLR060 [1.109 MB]

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MOPLR069

Implication of Manufacturing Errors on the Layout of Stabilization System and on the Field Quality in a Drift Tube Linac - RF DTL Error Study

DTL, linac, simulation, drift-tube-linac

290

R. De Prisco, A.R. Karlsson
Lund University, Lund, Sweden
M. Eshraqi, Y.I. Levinsen, R. Miyamoto
ESS, Lund, Sweden

The field flatness and the layout of the stabilization system in a drift tube linac are strongly dependent on the manufacturing errors that affect the local resonant frequency. In this paper a methodology is presented to study, firstly, the sensitivity of the resonant frequency and of the field flatness to each geometrical parameter of the drift tubes; then a set of tolerances for each parameter is found and a stabilization system layout is defined in order to keep the field flatness within an acceptable limit.

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TU1A03

Experience with the Construction and Commissioning of Linac4

linac, ion, DTL, cavity

342

J.-B. Lallement
CERN, Geneva, Switzerland

In the framework of the LHC Injector Upgrade program, CERN is presently commissioning Linac4, a 160MeV H⁻ ion linac, which will replace the present 50 MeV proton linac (Linac2) as injector to the PS Booster during the next LHC long shut-down. The installation of the machine has proceeded in parallel with a staged beam commissioning at the energies of 3, 12, 50, 100 MeV and finally 160 MeV, foreseen for fall 2016. A seven month long reliability run will take place during 2017 to access potential weak points and find mitigations. The lessons learnt during its construction, the main outcomes of the beam commissioning and the remaining steps toward its connection to the PS Booster are presented in this paper.

Slides TU1A03 [5.747 MB]

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TUOP03

Developments on the 1.4 MeV/u Pulsed Gas Stripper Cell

ion, target, heavy-ion, linac

387

P. Scharrer, W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar, A. Yakushev
HIM, Mainz, Germany
W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, P. Scharrer, A. Yakushev
GSI, Darmstadt, Germany
Ch.E. Düllmann, P. Scharrer
Mainz University, Mainz, Germany

The GSI UNILAC in combination with SIS18 will serve as a high-current, heavy-ion injector for the FAIR facility. It must meet high demands in terms of beam brilliance at a low duty factor. As part of an UNILAC upgrade program dedicated to FAIR, a new pulsed gas stripper cell was developed, aiming for increased beam intensities inside the post-stripper. The pulsed gas injection is synchronized with the beam pulse timing, enabling a highly-demanded, increased gas density. First tests using uranium beams on a hydrogen target showed a 60%-increased stripping efficiency into the desired 28+ charge state. In 2015, the setup was improved to be able to deliver increased target thicknesses and enhanced flexibility of the gas injection. In recent beam times, the pulsed gas cell was used with various ion-beam types, to test the capabilities for operation at the GSI UNILAC. The stripping of two ion beams in different gases at different gas densities was successfully tested in mixed-beam operation. Charge fractions, beam emittance, and energy-loss were systematically measured using uranium, bismuth, titanium, and argon beams on hydrogen, helium, and nitrogen targets. Selected results will be presented at the conference.

Slides TUOP03 [1.131 MB]

Poster TUOP03 [5.943 MB]

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TUPRC002

ESS DTL Beam Dynamics Comparison Between S-Code and T-Code

DTL, simulation, software, linac

411

M. Comunian, L. Bellan, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
L. Bellan
Univ. degli Studi di Padova, Padova, 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 DTL beam dynamics comparison between the s-code TraceWin and the t-code Parmela is presented. Full field map of the permanent magnet quadrupoles (with COMSOL) and RF fields of each of the 5 tanks (with MDTFish) were used for the two programs.

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TUPRC003

Effect of Number of Macro Particles on Time Evolution of Phase Space Distribution

electron, simulation, linac, operation

414

T. Miyajima
KEK, Ibaraki, Japan

Funding: This work was supported by JSPS KAKENHI Grant Number 26600147.
In particle tracking simulation with space charge effect, the macro-particle model, which has same mass-to-charge ratio, is widely used, since it does not require any symmetry of beam shape. However, selection of proper number of macro-particles is important, because the accuracy depends on it. Emittance, which is calculated by phase-space distribution, is especially affected by the number of macro-particles. In order to study the relation between the number of macro-particles and the resolution in the phase space, we defined a transformation, which describes reduction process of macro-particle number, and analyzed static phase space distribution. As a next step, we studied the effect of the macro-particle number on the dynamics of the phase space distribution for 1D charged particle distribution in the rest frame. The numerical result shows that the number of macro-particles affected the phase space distribution around the head and the tail of the bunch.
* T. Miyajima, "Effect of number of macro particles in phase space distribution", in Proc. of IPAC2015, Richmond, VA, USA, pp.242-244 (2015).

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TUPRC005

Source and LEBT Beam Preparation for IFMIF-EVEDA RFQ

rfq, solenoid, simulation, injection

420

L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
P.-Y. Beauvais, B. Bolzon, N. Chauvin
CEA/DSM/IRFU, France
L. Bellan
Univ. degli Studi di Padova, Padova, Italy
P. Cara
Fusion for Energy, Garching, Germany
H. Dzitko
F4E, Germany
R. Gobin, F. Senée
CEA/DRF/IRFU, Gif-sur-Yvette, France
R. Ichimiya, A. Kasugai, M. Sugimoto
JAEA, Aomori, Japan
A. Marqueta, F. Scantamburlo
IFMIF/EVEDA, Rokkasho, Japan

The commissioning phase of the IFMIF-EVEDA RFQ requires a complete beam characterization with simula-tions and measurements of the beam input from the IFMIF-EVEDA ion source and LEBT, in order to reach the RFQ input beam parameters. In this article, the simula-tions results of the complex source-LEBT with the corre-sponding set of measurements and their impact on the commissioning plan will be reported.

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TUPRC011

Ongoing Studies of the SuSI ECR Ion Source and Low Energy Beam Transport Line at the MSU NSCL

ion, extraction, ion-source, plasma

438

A.N. Pham, J. Fogleman, D. Leitner, G. Machicoane, D.E. Neben, S. Renteria, J.W. Stetson, L. Tobos
NSCL, East Lansing, Michigan, USA

Funding: Research supported by Michigan State University and National Science Foundation Award PHY-1415462.
Heavy ion accelerator laboratories for nuclear science and rare isotope research require a wide array of high intensity heavy ion beams. Due to their versatility and robustness, Electron Cyclotron Resonance (ECR) ion sources are the choice injectors for the majority of these facilities worldwide. Steady improvements in the performance of ECR ion sources have been successful in providing intense primary beams for facilities such as the National Superconducting Cyclotron Laboratory (NSCL). However, next generation heavy ion beam laboratories, such as the Facility for Rare Isotope Beam (FRIB), require intensities that approaching the limits of current possibility with state of the art ion source technology. In this proceedings, we present the ongoing low energy beam transport characterization efforts of a superconducting ECR ion source injector system at the MSU NSCL.

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TUPRC016

S-Band Booster Design and Emittance Preservation for the Awake e-Injector

linac, plasma, electron, booster

449

O. Mete Apsimon, R. Apsimon, G. Burt
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
S. Döbert
CERN, Geneva, Switzerland
G.X. Xia
UMAN, Manchester, United Kingdom

AWAKE is a proton driven plasma wakefield acceleration experiment at CERN which uses the protons from the SPS. It aims to study the self modulation instability of a proton bunch and the acceleration of an externally injected electron beam in the plasma wakefields, during the so called Phase II until the technical stop of LHC and its injector chain (LS2) in 2019. The external electron beam of 0.1 to 1nC charge per bunch will be generated using an S-band photo injector with a high QE semiconducting cathode. A booster linac was designed to allow variable electron energy for the plasma experiments from 16 to 20 MeV. For an RF gun and booster system, emittance control can be highlighted as a challenging transmission task. Once the beam emittance is compensated at the gun exit and the beam is delivered to the booster with an optimum beam envelope, fringing fields and imperfections in the linac become critical for preserving the injection emittance. This paper summarises the rf design studies in order to preserve the initial beam emittance at the entrance of the linac and alternative mitigation schemes in case of emittance growth.

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TUPRC020

The TRIUMF ARIEL RF Modulated Thermionic Electron Source

electron, cathode, TRIUMF, target

458

F. Ames, Y.-C. Chao, K. Fong, N. Khan, S.R. Koscielniak, A. Laxdal, L. Merminga, T. Planche, S. Saminathan, D.W. Storey
TRIUMF, Vancouver, Canada
Y.-C. Chao, L. Merminga
SLAC, Menlo Park, California, USA
C.K. Sinclair
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: ARIEL is funded by the Canada Foundation for Innovation, the Provinces AB, BC, MA, ON, QC, and TRIUMF. TRIUMF receives funding via a contribution agreement with the National Research Council of Canada
Within the ARIEL (Advanced Rare IsotopE Laboratory) at TRIUMF, a high power electron beam is used to produce radioactive ion beams via photo-fission. The electron beam is accelerated in a superconducting linac up to 50 MeV. The electron source provides electron bunches with charge up to 16 pC at a repetition frequency of 650 MHz leading to an average current of 10 mA . The kinetic energy of the electrons has been chosen to be 300 keV to allow direct injection into an accelerator cavity. The main components of the source are a gridded dispenser cathode (CPI 'Y845) in an SF6 filled vessel and an in-air HV power supply. The beam is bunched by applying DC and RF fields to the grid. Unique features of the gun are its cathode/anode geometry to reduce field emission, and transmission of RF modulation via a dielectric (ceramic) waveguide through the SF6. The latter obviates the need for an HV platform inside the vessel to carry the RF generator and results in a significantly smaller/simpler vessel. The source has been installed and first tests with accelerated beams have been performed. Measurements of the beam properties and results from the commissioning of the source will be presented.

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TUPLR070

Efficient Heavy Ion Acceleration with IH-Type Cavities for High Current Machines in the Energy Range up to 11.4 MeV/u

linac, DTL, simulation, cavity

616

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

Funding: BMBF 05P15RFRBA
We propose an efficient design for heavy ion acceleration from 1.4 to 11.4 MeV/u with a design current of 15 emA for a Uranium 28+ beam. The proposed linac is based on IH-DTL cavities and quadrupole triplet focusing. The KONUS beam dynamics concept is used to achieve high acceleration efficiency. By optimization of the transversal focusing scheme and the longitudinal bunch center motion, low emittance growth for the entire linac is achieved. Beam dynamics simulations were performed along with 3D rf-simulations of all cavities. The cavities are designed for 10⁸.408 MHz, reaching an effective shunt impedance of 100-200 MOhm/m. The overall length of the linac is below 25 m. A mechanical realization concept employing a modular tank design is presented. The proposed design is a viable option for the GSI UNILAC poststripper linac replacement, leaving free space in the UNILAC tunnel for future energy upgrades.

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TH1A03

Development of New Heavy Ion Linacs at GSI

linac, DTL, ion, solenoid

688

L. Groening, S. Mickat
GSI, Darmstadt, Germany

The heavy ion linac UNILAC at GSI will be upgraded in order to meet the beam requirements imposed by the upcoming FAIR facility. This upgrade includes several innovative techniques and applications. They comprise a new gaseaous stripper with enhanced efficiency, full 4d transverse emittance measurements, a round-to-flat beam adaptor, asymmetric transverse focusing along the new Alvarez DTL, optimized shape of the drift tube surface w.r.t. shunt impedance per surface field, and a field stabilization and tuning scheme without post-couplers. Additionally, we report on development of a super-conducting cw linac for intermediate mass ions which will be dedicated to production of super heavy elements close to the Coulomb barrier.

Slides TH1A03 [3.016 MB]

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TH2A02

Results From the Laserwire Emittance Scanner and Profile Monitor at CERN's Linac4

laser, detector, electron, linac

715

T. Hofmann, U. Raich, F. Roncarolo
CERN, Geneva, Switzerland
G.E. Boorman, A. Bosco, S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom
G.E. Boorman, A. Bosco, S.M. Gibson
JAI, Egham, Surrey, United Kingdom

A novel, non-invasive, H⁻ laser-wire scanner has been tested during the beam commissioning of CERN's new Linac4. Emittance measurements were performed at beam energies of 3 and 12 MeV with this new device and were found to closely match the results of conventional slit-grid methods. In 2015, the configuration of this laser-wire scanner was substantially modified. In the new setup the electrons liberated by the photo-detachment process are deflected away from the main beam and focused onto a single crystal diamond detector that can be moved in order to follow the laser beam scan. The beam profiles measured with the new laser-wire setup at 50 MeV, 80 MeV and 10⁷ MeV are in good agreement with the measurements of nearby SEM grids and wire-scanners. The design of the final laser-wire scanner for the full 160 MeV beam energy will also be presented. In Linac4 two independent laser-wire devices will be installed in the transfer line to the BOOSTER ring. Each device will be composed of two parts: one hosting the laser-wire and the electron detector and the second hosting the segmented diamond detector used to acquire the transverse profiles of the H⁰ beamlets.

Slides TH2A02 [3.164 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH2A02

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TH2A03

Complete Transverse 4D Beam Characterization for Ions Beams at Energies of Few MeV/u

quadrupole, coupling, ion, vacuum

720

M.T. Maier, X. Du, P. Gerhard, L. Groening, S. Mickat, H. Vormann
GSI, Darmstadt, Germany

Measurement of the ion beam rms-emittances is done through determination of the second order beam moments. For time being the moments quantifying the amount of inter-plane coupling, as <xy'> for instance, have been accessible to measurements just for very special cases of ions at energies below 200 keV/u using pepperpots. This talk presents successful measurements of all inter-plane coupling moments at 1 to 11 MeV/u. From first principles the used methods are applicable at all ion energies. The first campaign applied skewed quadrupoles in combination with a regular slit/grid emittance measurement device. The second campaign used a rotatable slit/grid device in combination with regular quadrupoles.

Slides TH2A03 [17.343 MB]

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THOP12

Electron Linac Upgrade for Thomx Project

gun, linac, electron, laser

773

L. Garolfi, C. Bruni, M. El Khaldi
LAL, Orsay, France
N. Faure, A. Perez Delaume
PMB-ALCEN, PEYNIER, France

The injector Linac for Thomx * consists of an electron gun and S-band accelerating section. The RF gun is a 2.5 cells photo-injector able to provide electron bunches with 5 MeV energy. During the commissioning phase, a standard S-band accelerating section is able to achieve around 50 MeV corresponding to around 45 keV X-rays energy. Since the maximum targeted X-ray energy is 90 keV, the Linac design will provide a beam energy of 70 MeV. The Linac upgrade of the machine covers many different aspects. The purpose is to increase the compactness of the accelerator complex whereas the beam properties for ring injection are kept. A LAL Orsay-PMB ALCEN collaboration has been established. The program foresees the RF design, prototyping and power tests of a high-gradient compact S-band accelerating structure. To fulfill the technical specifications at the interaction point, the Linac must be carefully designed. Beam dynamics simulations have been performed for optimizing the emittance and the energy spread for the ring entrance. The best set of parameters together with the effect of the accelerating section to the beam dynamics at the end of the LINAC will be presented.
* A. Variola, et al, "The Thomx Project Status", Proceedings of IPAC2014, Dresden, Germany.

Slides THOP12 [1.726 MB]

Poster THOP12 [0.823 MB]

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THPRC026

Optical Design of the PI-Test MEBT Beam Scraping System

SRF, focusing, linac, space-charge

827

A. Saini, A.V. Shemyakin
Fermilab, Batavia, Illinois, USA

PI-Test [1] is an accelerator facility under construction at Fermilab that will provide a platform to demonstrate critical technologies and concept of front-end of the PIP-II superconducting radio frequency (SRF) linac. It will be capable to accelerate an H⁻ ion beam with average current of 2 mA up to 25 MeV in continuous wave (CW) regime. To protect the SRF components from beam irradiation, the Medium Energy Beam Transport (MEBT) section of PI-Test includes an elaborated beam scraping system. It consists of four assemblies spread along the MEBT, with each assembly composed of four radiation-cooled, electrically isolated plates that can be moved into the beam in horizontal and vertical direction. The primary objectives of scraping system are to intercept particles with large transverse action and to protect the beamline elements and SRF linac in case of errors with beam focusing or steering. In this paper we formulate requirements for the scraping system and discuss factors affecting its efficiency. An optical design compatible with PI-Test MEBT is also presented.

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THPLR062

Muon Acceleration Using an RFQ

rfq, linac, experiment, acceleration

992

Y. Kondo, K. Hasegawa
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Fukao, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, K. Shimomura
KEK, Tsukuba, Japan
K. Ishida
RIKEN Nishina Center, Wako, Japan
R. Kitamura
University of Tokyo, Tokyo, Japan
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

A muon linac development for a new muon g-2 experiment is now going on at J-PARC. Muons from the muon beam line (H-line) at the J-PARC MLF are once stopped in an silica aerojel target and room temperature muoniums are evaporated from the aerogel. They are dissociated with laser (ultra slow muons), then accelerated up to 212 MeV using a linear accelerator. As the first accelerating structure, an RFQ will be used. We are planning to use a spare RFQ of the J-PARC linac for the first acceleration test. For this acceleration test, an degraded muon beam will be used instead of the ultra slow muon sourece. In this paper, present status of this muon acceleration test using the J-PARC RFQ is presented.

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FR1A02

Installation and On-Line Commissioning of EBIS at ATLAS

ion, electron, rfq, beam-transport

1022

P.N. Ostroumov, A. Barcikowski, J.A. Clark, C. Dickerson, M.R. Hendricks, Y. Luo, R.C. Pardo, C.E. Peters, M.A. Power, G. Savard, S.I. Sharamentov, R.C. Vondrasek, G.P. Zinkann
ANL, Argonne, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357.
An Electron Beam Ion Source Charge Breeder (EBIS-CB) has been developed at Argonne to breed radioactive beams from the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility at ATLAS. The CARIBU EBIS-CB has been successfully commissioned offline with an external singly-charged cesium ion source. The EBIS performance meets the breeding requirements to deliver CARIBU beams to ATLAS. EBIS can provide charge-to-mass ratios >=1/7 for all CARIBU beams with breeding times in the range of 6 ms to 30 ms. A record high breeding efficiency of up to 28% into a single charge state of Cs²⁸⁺ has been demonstrated. Following the offline testing EBIS was moved to the front end of ATLAS where the alignment of EBIS was substantially improved and additional beam diagnostic tools both for electron and ion beams were installed. This paper will discuss EBIS improvements and present the results of on-line commissioning.

Slides FR1A02 [7.717 MB]

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FR1A05

Development of a Muon Linac for the G-2/EDM Experiment at J-PARC

rfq, acceleration, linac, cavity

1037

M. Otani, N. Kawamura, T. Mibe, F. Naito, M. Yoshida
KEK, Tsukuba, Japan
K. Hasegawa, Y. Kondo
JAEA, Ibaraki-ken, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
T. Ito
JAEA/J-PARC, Tokai-mura, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
Y. Iwata
NIRS, Chiba-shi, Japan
R. Kitamura
University of Tokyo, Tokyo, Japan
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Precision measurements of the muon's anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective ways to test the standard model. An ultra-cold muon beam is generated from a surface muon beam by a thermal muonium production and accelerated to 300 MeV/c by a linac. The muon linac consists of an RFQ, an inter-digital IH, a Disk And Washer structure, and a disk loaded structure. The ultra-cold muons will have an extremely small momentum spread of 0.3 % with a normalized transverse emittance of around 1.5 pi mm-mrad. The design and status of the muon linac at J-PARC will be presented.

Slides FR1A05 [13.154 MB]

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