IPAC2017 - List of Keywords (detector)

Paper	Title	Other Keywords	Page
MOOCB1	Time-Resolved Energy Spread Studies at the ANKA Storage Ring	storage-ring, timing, radiation, synchrotron	53
	B. Kehrer, E. Blomley, M. Brosi, E. Bründermann, A.-S. Müller, M.J. Nasse, M. Schedler, M. Schuh, M. Schwarz, P. Schönfeldt, N.J. Smale, J.L. Steinmann KIT, Karlsruhe, Germany N. Hiller PSI, Villigen PSI, Switzerland P. Schütze DESY, Hamburg, Germany
	Funding: This work has been supported by the Initiative and Networking Fund the Helmholtz Association under contract number VH-NG-320 and the BMBF under contract numbers 05K13VKA and 05K16VKA. Recently, a new setup for measuring the beam energy spread has been commissioned at the ANKA storage ring at the Karlsruhe Institute of Technology. This setup is based on a fast-gated intensified camera and detects the horizontal profiles of individual bunches in a multi-bunch environment on a single-turn base. As the radiation source point is located in a dispersive section of the storage ring, this allows time-resolved studies of the energy spread. These studies are of particular interest in the framework of short-bunch beam dynamics and the characterization of instabilities. The system is fully synchronized to other beam diagnostics devices allocated in various places along the storage ring, such as the single-shot electro-optical spectral decoding setup or the turn-by-turn terahertz detection systems. Here we discuss the results of the synchronous measurements with the various systems with special emphasis on the energy spread studies.
	Slides MOOCB1 [6.514 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCB1
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOOCB3	Intensity Interferometer to Measure Bunch Length at SPEAR3	photon, optics, electron, storage-ring	60
	W.J. Corbett SLAC, Menlo Park, California, USA T.M. Mitsuhashi KEK, Ibaraki, Japan
	Electron bunch length in a storage ring is typically measured with streak cameras, electro-optic devices or non-linear cross-correlation techniques with a range of system complexity, signal-to-noise ratios and cost. Another straight-forward method is to construct an 'intensity interferometer' utilizing a coincidence detector to record simultaneous photon arrival events. In this configuration, visible SR light is passed through a narrow bandpass filter followed by a small pinhole to generate a stream of single-mode monochromatic wavepackets. As the interferometer delay is scanned across an electron bunch, two-photon events occurring within the longitudinal coherence time of the light cause a reduction in the measured coincidence rate. The resulting autocorrelation of the optical pulse duration reveals the electron bunch length, independent of synchrotron oscillation motion. In this paper we comment on the theory and report on preliminary measurements carried out at SPEAR3.
	Slides MOOCB3 [2.606 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCB3
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB025	Measurement of the Polarisation of Coherent Smith-Purcell Radiation in the SOLEIL Linac	radiation, polarization, linac, experiment	129
	N. Delerue, S. Jenzer, V. Khodnevych LAL, Orsay, France N. Hubert, M. Labat, J.-P. Pollina, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	Funding: CNRS/IN2P3, Université Paris-Sud and ANR (contract ANR-12-JS05-0003-01) SPESO is an experiment installed in the Linac of Synchrotron SOLEIL to study the Coherent Smith-Purcell radiation produced when a grating is approached from the beam. The detectors used to measure this radiation are mounted on 3-translation axis and 2 rotation axis. This allows measurements of the radiation emission map around the grating. In addition a polarizer has been added in 2016 allowing to study the two polarization components of the radiation in this map. Preliminary results of this mapping will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB025
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB026	Study of a Smith-Purcell Radiation-Based Longitudinal Profile Monitor at the CLIO Free Electron Laser	radiation, electron, laser, free-electron-laser	132
	V. Khodnevych, N. Delerue, S. Jenzer, H. Roesch LAL, Orsay, France J.P. Berthet, F. Glotin, J.-M. Ortega, R. Prazeres LCP/CLIO, Orsay, Cedex, France N. Jestin CLIO/ELISE/LCP, Orsay, France
	Funding: CNRS and ANR (contract ANR-12-JS05-0003-01) We report on measurements of Coherent Smith-Purcell radiation at the CLIO Free Electron Laser. Smith-Purcell radiation is emitted when a grating is brought close from a bunch of relativistic particles. When the bunch is sufficiently short coherent radiation is emitted. This coherent radiation encodes the longitudinal form factor of the bunch and can therefore be used as a longitudinal profile monitor. With its short pulses and high charge the 45 MeV Linac of CLIO is a good location to test advanced longitudinal profile diag- nostics. The results will be compared with measurements using the RF dephasing. induced energy dispersion.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB026
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB027	Preparation of CVD Diamond Detector for fast Luminosity Monitoring of SuperKEKB	luminosity, simulation, monitoring, target	135
	C.G. Pang, P. Bambade, D. El Khechen, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault LAL, Orsay, France
	The SuperKEKB e⁺-e⁻ collider aims to reach a very high luminosity of 8×10 ³⁵ cm'2s'1, using highly focused ultra-low emittance bunches colliding every 4ns. To meet the requirement of the dithering feedback system used to stabilize the horizontal orbit at the IP (interaction point), a relative precision of 10 '3 in 1ms is specified for the fast luminosity monitoring, which can be in principle achieved thanks to the large cross section of the radiative Bhabha process. This paper firstly presents the fraction of detected Bhabha scattering positrons with a new beam pipe arrangement coupled with a Tungsten radiator to be installed in the Low Energy Ring; Then the characteristics of signals from a sCVD diamond detector with thickness of 140'm coupled with a broadband current amplifier were studied based on tests with a Sr-90 source; Finally, simulated results for the reconstructed luminosity and the relative precision with different assumed luminosities are also reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB027
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB029	Experimental Study of Halo Formation at ATF2	vacuum, simulation, scattering, electron	142
	R.J. Yang, P. Bambade, A. Faus-Golfe, V. Kubytskyi, S. Wallon LAL, Orsay, France A. Aryshev, T. Naito KEK, Ibaraki, Japan N. Fuster-Martínez IFIC, Valencia, Spain
	For Accelerator Test Facility 2 (ATF2), as well as other high-intensity accelerators, beam halo has been an important aspect reducing the machine performance and activating the components. It is imperative to clearly understand the mechanisms that lead to halo formation and to test the avail- able theoretical models with an adequate experiment setup. In this paper, the experimental measurement of the beam halo formation from beam gas scattering is presented. The upgrading of an OTR/YAG screen monitor for future halo study is also introduced.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB029
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB038	Research and Development of Diamond Based Beam Monitoring and Diagnostics Systems at the S-DALINAC	monitoring, simulation, FPGA, electron	163
	A. Rost, T. Galatyuk TU Darmstadt, Darmstadt, Germany T. Galatyuk, J. Pietraszko GSI, Darmstadt, Germany
	Funding: This work has been supported by the DFG through GRK 2128 and VH-NG-823. For future experiments with the HADES and CBM detectors at FAIR in Darmstadt, a radiation hard and fast beam detector is required. The beam detector has to perform precise T0 measurements (σ_T0 < 50 ps) and should also offer beam monitoring capabilities. These tasks can be fulfilled by utilizing single-crystal Chemical Vapor Deposition (scCVD) diamond based detectors. For research and development of such detectors, a test set-up will be installed at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC) of TU Darmstadt. A read-out system for a beam monitoring and diagnostics system is currently under development. It is based on the already well established TRB3 platform, which can provide FPGA based signal discriminators and high precision FPGA-TDCs with on-line monitoring capabilities. In this contribution the concept and the performance of a prototype beam monitoring system will be discussed. Furthermore the preparatory work, with particular focus on the beam-line simulations, for a multipurpose beam detector test set-up at the S-DALINAC will be addressed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB038
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB056	4-Channel Single Shot and Turn-by-Turn Spectral Measurements of Bursting CSR	radiation, synchrotron, simulation, storage-ring	231
	J.L. Steinmann, E. Blomley, M. Brosi, E. Bründermann, M. Caselle, B. Kehrer, A.-S. Müller, L. Rota, M. Schuh, P. Schönfeldt, M. Siegel, M. Weber KIT, Karlsruhe, Germany
	The test facility and synchrotron radiation source ANKA at the Karlsruhe Institute of Technology (KIT) in Karlsruhe, Germany, can be operated in a short-bunch mode. Above a threshold current, the high charge density leads to microwave instabilities and the formation of sub-structures. These time-varying sub-structures on bunches of picosecond duration lead to the observation of bursting coherent synchrotron radiation (CSR) in the terahertz (THz) frequency range. The spectral information in this range contains valuable information about the bunch length, shape and sub-structures. We present recent measurements of a spectrometer setup that consists of 4 ultra-fast THz detectors, sensitive in different frequency bands, combined with the KAPTURE readout system developed at KIT for studies requiring high data throughput. This setup allows to record continuously the spectral information on a bunch-by-bunch and turn-by-turn basis. This contribution describes the potential of time-resolved spectral measurements of the short-bunch beam dynamics.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB056
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB059	Energy Chirp Measurements by Means of an RF Deflector: a Case Study the Gamma Beam Source LINAC at ELI-NP	electron, linac, brightness, simulation	242
	L. Sabato U. Sannio, Benevento, Italy P. Arpaia, A. Liccardo Naples University Federico II, Science and Technology Pole, Napoli, Italy A. Mostacci, L. Palumbo University of Rome La Sapienza, Rome, Italy A. Variola INFN/LNF, Frascati (Roma), Italy
	RF Deflector (RFD) based measurements are widely used in high–brightness electron LINAC around the world in order to measure the ultra–short electron bunch length. The RFD provides a vertical kick to the particles of the electron bunch according to their longitudinal positions. In this paper, a measurement technique for the bunch length and other bunch proprieties, based on the usage of an RFD, is proposed. The basic idea is to obtain information about the bunch length, energy chirp, and energy spread from vertical spot size measurements varying the RFD phase, because they add contributions on this quantity. The case study is the Gamma Beam System (GBS), the Compton Source being built in the Extreme Light Infrastructure–Nuclear Physics (ELI–NP) facility. The ELEctron Generation ANd Tracking (ELEGANT) code is used for tracking the particles from RFD to the measurement screen.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB059
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB061	DAΦNE BTF Improvements of the Transverse Beam Diagnostics	software, linac, timing, positron	250
	P. Valente INFN-Roma, Roma, Italy B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta INFN/LNF, Frascati (Roma), Italy
	The DAΦNE BTF (beam-test facility) can provide electrons and positrons, tuning at runtime different beam parameters: energy (from about 50 MeV up to 750 MeV for e^- and 540 MeV for e+), intensity (from single particle up to 10¹⁰/bunch) and pulse length (in the range 1.5-40 ns) up to 49 Hz, depending on the operations of the DAΦNE collider. The beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad (downstream of the vacuum beam-pipe exit window), matching the user needs. We describe of the BTF beam transverse monitor systems based on FitPIX detectors, operating in bus synchronization mode externally timed to the BTF beam. We also describe our custom software allowing the acquisition and synchronization of the beam diagnostics with the users data, using TCP/IP calls to MEMCACHED. The performance of the system in a variety of beam intensity, energy and focusing conditions is reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB061
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB073	Measurement of Electron-Bunch Length Using Coherent Radiation in Infrared Free-Electron Laser Facilities	electron, FEL, radiation, laser	288
	N. Sei, H. Ogawa AIST, Tsukuba, Ibaraki, Japan K. Hayakawa, Y. Hayakawa, K. Nogami, T. Sakai, T. Tanaka LEBRA, Funabashi, Japan H. Ohgaki, H. Zen Kyoto University, Kyoto, Japan
	Funding: This study was financially supported by JSPS KAKENHI Grant Number JP16H03912. We have studied techniques evaluating bunch length of micropulses in an electron beam. The bunch length of the electron beam is an important parameter for free-electron laser (FEL) facilities with linear accelerators. In order to obtain high FEL gain at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University and at Kyoto University Free Electron Laser (KU-FEL), the electron-bunch length is compressed to less than 1 ps in their undulator sections. Using the compressed electron beams, intense terahertz lights were generated by coherent radiation. The power of the coherent radiation was more than 50 micro-joule per electron-beam macropulse. We can extract the information of the bunch length of the electron-beam micropulse from the intense coherent radiation by using narrow-band diode detectors. In this presentation, experimental results of the measurements of the root-mean-square electron-bunch length using the coherent radiation at LEBRA* and KU-FEL** will be reported. : N. Sei et al., J. Opt. Soc. Am. B, 31, 2150 (2014). *: N. Sei et al., Nucl. Instrum. Methods Phys. Res., Sect. A, 832, 208 (2016).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB073
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB074	Low Intensity Electron Beam Controlling and Monitoring	electron, linac, controls, experiment	292
	L. Yu, Y. Li, Y.F. Sui, J.H. Yue IHEP, Beijing, People's Republic of China
	To calibrating a cosmic-ray detector, a low beam current accelerator has been built to generate ultra low intensity electron beams at Institute of High Energy Physics (IHEP). The minimum beam charge obtained was estimated to be about one electron/pulse. Beam commissioning has been carried out. The key technologies for achieving such low intensity electron beams are to control the beam using 8 movable slits and to measure the intensity of the beam using 9 movable current monitors based on scintillator. In this paper, principal of operation, instrumentation and programming of the movable slits and movable current monitors are discussed. Some results of beam commissioning are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB074
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB094	A Fast Beam Size Diagnostic System Using High-Speed Photomultiplier Array at SSRF	diagnostics, pick-up, storage-ring, synchrotron	345
	H.J. Chen, N. Zhang SSRF, Shanghai, People's Republic of China J. Chen, B. Gao, L.W. Lai, Y.B. Leng SINAP, Shanghai, People's Republic of China
	A fast beam size diagnostic system is developing at SSRF (Shanghai Synchrotron Radiation Facility) storage ring for turn-by-turn and bunch-by-bunch beam trans-verse oscillation study and fast transverse feedback sys-tem improvement. The system is based on visible synchrotron radiation diagnostic, detected by a Hamamatsu H10515B 16-channel photomultiplier array with 0.6ns rise time. A telescope imaging system is also developing for optical front-end process, with simulation optical path calibra-tion and high-resolution CCD camera reference. A fast pick-up board and amplifiers are designed for analogue signal optimization. The data acquisition and analyse solution is Tektronix oscilloscope with 6GHz analogue bandwidth and 25GS/s sampling rate or four synchronized ADQ14 digitizers with 700MHz analogue bandwidth and 1GS/s sampling rate. By now, we have finished the detector selection, sys-tem setup, data acquisition design and system response testing. The telescope imaging testing and 16-channels data acquisition based on synchronized ADQ14s are under development. A new photomultiplier array with less response time is in plan for strictly bunch-by-bunch diagnostic.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB094
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB110	Comparison of Transverse Emittance Measurements in the LHC	emittance, luminosity, experiment, operation	377
	M. Hostettler, R. Alemany-Fernández, F. Alessio, M. Ferro-Luzzi, K. Fuchsberger, G. Iadarola, R. Matev, S. Papadopoulou, Y. Papaphilippou, G. Papotti, G. Trad CERN, Geneva, Switzerland F. Antoniou The University of Liverpool, Liverpool, United Kingdom G.R. Coombs University of Glasgow, Glasgow, United Kingdom T.B. Hadavizadeh Oxford University, Physics Department, Oxford, Oxon, United Kingdom
	Transverse emittance measurement in a collider is of crucial importance for understanding beam dynamics observations and evaluating the machine performance. Devices measuring the beam emittance face the challenge of dealing with considerable systematic errors that can compromise the quality of the measurement. Having different instruments or techniques that provide beam size estimations in order to compare the outcome and give an unbiased value of the emittance is very important in a collider. The comparison of the different results is as well very useful to identify possible problems in a given equipment which could remain unnoticed if such device is the only source of emittance reconstruction. In the LHC several of these instruments and techniques are available; wire scanners, synchrotron light monitors, emittance reconstruction from transverse convolved beam sizes extracted from luminosity scans at the LHC collision points and from beam-gas imaging in the vertex detector of the LHCb experiment. Those systems are briefly presented in this paper together with the comparison of the emittances reconstructed by each of them during physics production over the 2016 LHC run.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB110
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB121	Installation and Test of Pre-series Wire Scanners for the LHC Injector Upgrade Project at CERN	vacuum, controls, laser, electronics	412
	R. Veness, P. Andersson, W. Andreazza, N. Chritin, B. Dehning, J. Emery, A. Goldblatt, D. Gudkov, F. Roncarolo, J.L. Sirvent, J. Tassan-Viol CERN, Geneva, Switzerland
	A new generation of fast wire scanners is being developed for the LHC Injectors Upgrade (LIU) project at CERN. These will be essential tools for transverse profile measurement with the higher brightness LIU beams, and are planned for installation in 2019 in all three synchrotrons making up the LHC injector chain. An active period of development and test has resulted in prototype installations in the SPS and PSB rings. This paper will summarise the design and report on the results to-date.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB121
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB128	The Design of a Non-Destructive Single-Shot Longitudinal Bunch Profile Monitor using Smith-Purcell Radiation	radiation, background, polarization, experiment	433
	H. Harrison, G. Doucas, I.V. Konoplev, A.J. Lancaster, H. Zhang JAI, Oxford, United Kingdom A. Aryshev, M. Shevelev, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan
	Funding: This work was supported by the: the STFC UK, the Leverhulme Trust, the JAI (University of Oxford) and the Photon and Quantum Basic Research Coordinated Development (Japan). The conceptual design for a single-shot longitudinal bunch profile monitor using coherent Smith-Purcell radiation (cSPr) has recently been completed. The exploitation of the directionality and the polarization of cSPr to reduce the length of the monitor and to eliminate background radiation are discussed. The linear polarization of cSPr will be used to separate the signal from background radiation and experiments to test this design will be presented. Alongside the conceptual design an investigation to optimize the number of detection channels needed to produce high quality longitudinal bunch profile reconstructions has been carried out. It has been determined that the number of detection channels can be reduced compared to previous experiments if measurement uncertainty and background radiation are minimized effectively.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB128
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB131	Transverse Emittance Measurements Using LHCb's Beam-Gas Interactions	emittance, real-time, experiment, operation	441
	T.B. Hadavizadeh Oxford University, Physics Department, Oxford, Oxon, United Kingdom R. Alemany-Fernández, F. Alessio, C. Barschel, G.R. Coombs, M. Ferro-Luzzi, R. Matev CERN, Geneva, Switzerland
	Measurements of the transverse beam emittance are of great importance at particle accelerators such as the LHC in order to monitor, understand and improve the performance of the machine. A number of profile monitors at the LHC are capable of measuring the transverse emittance from a range of different processes including wire scanners and beam synchrotron light monitors, each having advantages and shortcomings. It is possible additionally to measure the beam profiles using interaction vertices reconstructed in LHCb's vertex locator (Velo). Interactions between colliding beam particles and between beam particles and residual gas nuclei are used to build up a picture of the beam profiles. To guarantee the reliability and quality of the different emittance measurements, a dedicated cross-calibration was performed during a machine development period in October 2016. The results obtained with the LHCb Velo during this cross-calibration are presented here.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB131
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB144	Residual-Gas Beam Profile Monitors for Intense Beams in Transfer Lines	electron, ion, proton, synchrotron	469
	R.J. Abrams, M.A. Cummings, V.G. Dudnikov, R.P. Johnson Muons, Inc, Illinois, USA M. Popovic Fermilab, Batavia, Illinois, USA
	Muons, Inc. proposes to develop a Residual-Gas Beam Profile Monitor for Transfer Lines with pulse-to-pulse precision of better than 0.1 mm in position and size that will operate over a wide range of proton beam intensities including those needed for multi-MW beams of future facilities. Traditional solid-based beam intercepting instrumentation produces unallowable levels of radiation at high powers. Our alternative approach is to use a low mass residual-gas profile monitor, where ionization electrons are collected along extended magnetic field lines and the gas composition and pressure in the beam pipe are locally controlled to minimize unwanted radiation and to improve resolution. Beam Induced Fluorescence profile monitor with mirascope light collection is proposed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB144
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPIK048	Experimental Results of Crystal-Assisted Slow Extraction at the SPS	extraction, proton, experiment, collimation	623
	M.A. Fraser, S.S. Gilardoni, B. Goddard, V. Kain, D. Mirarchi, S. Montesano, S. Petrucci, S. Redaelli, R. Rossi, W. Scandale, L.S. Stoel, F.M. Velotti CERN, Geneva, Switzerland F.M. Addesa, G. Cavoto, F. Iacoangeli INFN-Roma, Roma, Italy F. Galluccio INFN-Napoli, Napoli, Italy F. Murtas INFN/LNF, Frascati (Roma), Italy
	The possibility of extracting highly energetic particles from the Super Proton Synchrotron (SPS) by means of silicon bent crystals has been explored since the 1990's. The channelling effect of a bent crystal can be used to strongly deflect primary protons and eject them from the synchrotron. Many studies and experiments have been carried out to investigate crystal channelling effects. The extraction of 120 and 270 GeV proton beams has already been demonstrated in the SPS with dedicated experiments located in the ring. Presently in the SPS, the UA9 experiment is performing studies to evaluate the possibility to use bent silicon crystals to steer particle beams in high energy accelerators. Recent studies on the feasibility of extraction from the SPS have been made using the UA9 infrastructure with a longer-term view of using crystals to help mitigate slow extraction induced activation of the SPS. In this paper, the possibility to eject particles into the extraction channel in LSS2 using the bent crystals already installed in the SPS is presented. Details of the concept, simulations and measurements carried out with beam are presented, before the outlook for the future is discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK048
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPIK067	Figure-8 Storage Ring - Ion Beam Injection into a Closed, Magnetic System	injection, experiment, storage-ring, ion	680
	H. Niebuhr, A. Ates, M. Droba, O. Meusel, U. Ratzinger IAP, Frankfurt am Main, Germany
	To store high current low-energetic ion beams of up to 10 A, a superconducting storage ring (F8SR) based on solenoidal and toroidal magnetic guiding fields is investigated at Frankfurt University. Besides simulations, a scaled down experimental setup with normalconducting magnets was built. Investigations of beam injection into closed, magnetic guiding fields are in progress. Therefore, a new kind of injection system consisting of a solenoidal injection coil and a special vacuum vessel was constructed. It is used to inject a hydrogen beam from the side between two toroidal magnets. In parallel operation, a second hydrogen beam is transported through both magnets to represent the circulating beam. The current status of the experimental setup and first experimental results will be shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK067
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPVA017	Electrostatic Pickup in the CNAO Injection Line	ion, linac, pick-up, proton	884
	A. Parravicini, G.M.A. Calvi, E. Rojatti, C. Viviani CNAO Foundation, Pavia, Italy
	The paper concerns the electrostatic pickup (PUB) installed in the injection line of the CNAO, the Italian facility for Oncological Hadrontherapy. The PUB has been designed with the purpose of having a continuous and non-interceptive measurement of the beam transverse position short upstream the injection in the synchrotron. Detector commissioning has not been immediate since a number of primary ions and secondary electrons fall on the PUB electrodes in many configurations, resulting in a significantly distorted signal. After the identification, and consequent rejection, of a few circumstances where the PUB cannot work properly, the commissioning proceeded on a twofold way, designing a mechanical shield to stop ions before hitting the electrodes and developing an advanced data-analysis algorithm to go beyond the signal distortion. The use of the new algorithm was sufficient to make the PUB successfully working and, after a proper calibration with upstream and downstream profile monitors, the PUB started to provide the expected results. The PUB is working as a watch-dog since January 2016. Details on the data-analysis algorithm and first year measurements are discussed in the paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA017
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPVA047	Investigation of Trapped Magnetic Flux in Superconducting Niobium Samples with Polarized Neutron Radiography	neutron, niobium, experiment, polarization	964
	O. Kugeler, J. Knobloch, M.M. Krzyzagorski, J.M. Köszegi, L. Riik, W. Treimer, R.F. Ziesche HZB, Berlin, Germany
	The dynamics of flux expulsion during superconducting transition and the influence of external AC magnetic fields on expulsion of trapped fields in Nb samples has been investigated with radiography using polarized neu-trons. Results of these experiments are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA047
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPVA061	Quench and Field Emission Diagnostics for the ESS Medium-Beta Prototypes Vertical Tests at LASA	cavity, radiation, electron, diagnostics	1007
	M. Bertucci, A. Bellandi, A. Bignami, A. Bosotti, J.F. Chen, P. Michelato, L. Monaco, R. Paparella, D. Sertore INFN/LASA, Segrate (MI), Italy C. Pagani Università degli Studi di Milano & INFN, Segrate, Italy S. Pirani ESS, Lund, Sweden
	In order to investigate the possible causes of premature thermal breakdown and performance degradation, several diagnostic techniques have been employed during the vertical tests of the Fine and Large Grain ESS Medium Beta prototypes cavities. The whole equipment, which includes second sound, fast thermometry, photodiode x ray detectors and an external NaI scintillator, is here described and the results so far obtained during the vertical tests presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA061
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOAB1	First LHC Transverse Beam Size Measurements With the Beam Gas Vertex Detector	target, hardware, vacuum, data-acquisition	1240
	A. Alexopoulos, C. Barschel, E. Bravin, G. Bregliozzi, N. Chritin, B. Dehning, M. Ferro-Luzzi, M. Giovannozzi, R. Jacobsson, L.K. Jensen, O.R. Jones, V. Kain, R. Matev, M.N. Rihl, V. Salustino Guimaraes, R. Veness, S. Vlachos, B. Würkner CERN, Geneva, Switzerland A. Bay, F. Blanc, S. Gianì, O. Girard, G.J. Haefeli, P. Hopchev, A. Kuonen, T. Nakada, O. Schneider, M. Tobin, Q.D. Veyrat, Z. Xu EPFL, Lausanne, Switzerland R. Greim, W. Karpinski, T. Kirn, S. Schael, A. Schultz von Dratzig, G. Schwering, M. Wlochal RWTH, Aachen, Germany
	The Beam Gas Vertex detector (BGV) is an innovative beam profile monitor based on the reconstruction of beam-gas interaction vertices which is being developed as part of the High Luminosity LHC project. Tracks are identified using several planes of scintillating fibres, located outside the beam vacuum chamber and perpendicular to the beam axis. The gas pressure in the interaction volume is adjusted such as to provide an adequate trigger rate, without disturbing the beam. A BGV demonstrator monitoring one of the two LHC beams was fully installed and commissioned in 2016. First data and beam size measurements show that the complete detector and data acquisition system is operating as expected. The BGV operating parameters are now being optimised and the reconstruction algorithms developed to produce accurate and fast reconstruction on a CPU farm in order to provide real time beam profile measurements to the LHC operators.
	Slides TUOAB1 [3.456 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOAB1
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOAB3	Development of Wide Dynamic Range Beam Loss Monitor System for the J-PARC Main Ring	operation, beam-losses, injection, extraction	1248
	K. Satou, N. Kamikubota, T. Toyama, S. Yamada J-PARC, KEK & JAEA, Ibaraki-ken, Japan S.Y. Yoshida Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
	The new beam loss monitor (BLM) system now in operation at the main ring of J-PARC consists of an isolated front-end current to voltage converter, a VME-based 24 bit ADC system. A dual detector system employs a proportional-type gas chamber (PBLM) and an air-filled ionization chamber (AIC). The system shows a wide dynamic range of 160 dB. It can detect the low level signal that would arise in the case of the detection of residual dose in the ring itself after the beam has been turned off as well as an event such as high level beam loss at the collimators. The signal rise time of the waveform obtained is 17 us which fast enough to meet the speed requirement of the Machine Protection System (MPS); which is that the MPS should dump the beam within 100 us when the beam loss signal exceeds the reference levels set in the ADC system.
	Slides TUOAB3 [2.692 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOAB3
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB018	Initial Data From an Electron Cloud Detector in a Quadrupole Magnet at CesrTA	electron, quadrupole, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB018
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB071	Experimental Results on THz Superradiation From the Undulator in Tsinghua University Beamline	radiation, undulator, electron, experiment	1488
	X.L. Su, Y.-C. Du, W.-H. Huang, L. Niu, C.-X. Tang, Q.L. Tian, D. Wang, L.X. Yan TUB, Beijing, People's Republic of China Y.F. Liang Tsinghua University, Beijing, People's Republic of China
	In this paper, the first operation of a widely tunable 8-period undulator at terahertz (THz) frequency in Tsinghua University beamline was reported. Superradiate undulator radiation from sub-picosecond electron bunches compressed by chicane was observed. The measured radiation curve shows clearly that the radiation energy is proportional to the charge square, and the THz frequency can be changed from 0.4 THz to 10 THz with narrow-band spectrums. Our results demonstrate a high power and tunable coherent THz source, which could be useful for many applications in the future.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB071
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB111	Energy Distribution and Work Function Measurements for Metal Photocathodes with Measured Levels of Surface Roughness	emittance, electron, FEL, plasma	1580
	L.B. Jones, T.S. Beaver, B.L. Militsyn, T.C.Q. Noakes, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom S. Mistry STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom S. Mistry Loughborough University, Leicestershre, United Kingdom
	Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 312453. The minimum achievable emittance in an electron accelerator depends strongly on the intrinsic emittance of the photocathode electron source which is measureable as the mean longitudinal and transverse energy spreads in the photoemitted electrons. Reducing emittance in an accelerator driving a Free Electron Laser (FEL) delivers significant reduction in the saturation length for an x-ray FEL, reducing machine cost and increasing x-ray beam brightness. There are many parameters which affect the intrinsic emittance of a photocathode. Surface roughness is a significant factor, and consequently the development of techniques to manufacture low roughness photocathodes with optimum emission properties is a priority for the electron source community. In this work, we present transverse energy distribution and work function measurements made using our TESS facility* for electrons emitted from copper and molybdenum photocathodes with differing levels of measured surface roughness. * Proc. FEL '06, THPPH013, 583-586 ** Proc. FEL '13, TUPPS033, 290-293
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB111
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK086	Modelling the Radioactivity Induced by Slow-Extraction Losses in the CERN SPS	extraction, proton, operation, radioactivity	1897
	M.A. Fraser, D. Björkman, K. Cornelis, B. Goddard, V. Kain, P.M. Schicho, C. Theis, H. Vincke CERN, Geneva, Switzerland
	Resonant slow extraction is used to provide an intense quasi-DC flux of high-energy protons for the Fixed Target (FT) physics programme at the CERN Super Proton Synchrotron (SPS). The unavoidable beam loss intrinsic to the extraction process activates the extraction region and its equipment. Although the radiation dose to equipment has an impact on availability, the cool-down times required to limit dose to the personnel carrying-out maintenance of the accelerator also pose important restrictions, and ultimately limit the number of protons on target. In order to understand how the extracted proton flux affects the build-up and subsequent cool-down of the induced activation, a model based on a simple empirical relationship has been developed and shown to predict the measured radioactive decay at ionisation chambers located along the extraction region. In this contribution, the empirical model is described, its strengths and limitations discussed, and its application as a predictive tool for estimating cool-down times as a function of extracted proton flux demonstrated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK086
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK089	Studies on Luminous Region, Pile-up and Performance for HL-LHC Scenarios	luminosity, operation, simulation, optics	1908
	L.E. Medina Medrano, G. Arduini, R. Tomás CERN, Geneva, Switzerland L.E. Medina Medrano UGTO, Leon, Mexico
	Funding: Research supported by the HL-LHC project and the Beam project (CONACYT, Mexico). Studies on luminous region and pile-up density are of great interest for the experiments at the future High Luminosity LHC (HL-LHC) in order to optimize the detector performance. The evolution of these parameters at the two main interaction points of the HL-LHC along optimum physics fills is studied for the baseline and alternative operational scenarios with the latest set of parameters, including a refined description of the longitudinal bunch profile. Results are discussed in terms of a new figure-of-merit, the effective pile-up density.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK089
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA032	Beam-Gas Background Observations at LHC	background, experiment, simulation, luminosity	2129
	S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom R. Alemany-Fernández, F. Alessio, G. Bregliozzi, H. Burkhardt, G. Corti, A. Di Mauro, M. Guthoff, A. Manousos, K.N. Sjobak, C. Yin Vallgren CERN, Geneva, Switzerland A. Alici Bologna University, Bologna, Italy S. D'Auria University of Glasgow, Glasgow, United Kingdom S.M. Gibson JAI, Egham, Surrey, United Kingdom D. Lazic BUphy, Boston, Massachusetts, USA
	Observations of beam-induced background at LHC during 2015 and 2016 are presented in this paper. The four LHC experiments use the non-colliding bunches present in the physics-filling pattern of the accelerator to trigger on beam-gas interactions. During luminosity production the LHC experiments record the beam-gas interactions using dedicated background monitors. These data are sent to the LHC control system and are used to monitor the background levels at the experiments during accelerator operation. This is a very important measurement, since poor beam-induced background conditions can seriously affect the performance of the detectors. A summary of the evolution of the background levels during 2015 and 2016 is given in these proceedings.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA032
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA036	Cross-Talk Studies between FCC-hh Experimental Interaction Regions	proton, collider, simulation, interaction-region	2136
	J.L. Abelleira, A. Seryi JAI, Oxford, United Kingdom R.B. Appleby, H. Rafique UMAN, Manchester, United Kingdom M.I. Besana CERN, Geneva, Switzerland
	Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol), EU's Horizon 2020 grant No 654305. Debris from 50 TeV proton-proton collisions at the main interaction point in the FCC-hh may contribute to the background in the subsequent detector. This cross-talk is of possible concern for the FCC-hh due to the high luminosity and energy of the collider. DPMJET-III is used as a collision debris generator in order to assess the muon cross-talk contribution. An analytical calculation of muon range in rock is performed. This is followed by a full Monte Carlo simulation using FLUKA, where the accelerator tunnel has been modelled. The muon cross talk between the adjacent interaction points is assessed and its implications for FCC-hh design are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA036
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA040	Overview of Design Development of FCC-hh Experimental Interaction Regions	luminosity, optics, dipole, experiment	2151
	A. Seryi, J.L. Abelleira, E. Cruz Alaniz, L.J. Nevay, L. van Riesen-Haupt JAI, Oxford, United Kingdom R.B. Appleby, H. Rafique UMAN, Manchester, United Kingdom R.B. Appleby Cockcroft Institute, Warrington, Cheshire, United Kingdom J. Barranco García, T. Pieloni EPFL, Lausanne, Switzerland M. Benedikt, M.I. Besana, X. Buffat, H. Burkhardt, F. Cerutti, A. Langner, R. Martin, W. Riegler, D. Schulte, R. Tomás CERN, Geneva, Switzerland M. Boscolo, F. Collamati INFN/LNF, Frascati (Roma), Italy M. Hofer TU Vienna, Wien, Austria L.J. Nevay Royal Holloway, University of London, Surrey, United Kingdom L. van Riesen-Haupt University of Oxford, Oxford, United Kingdom
	The experimental interaction region is one of the key areas that define the performance of the Future Circular Collider. In this overview we will describe the status and the evolution of the design of EIR of FCC-hh, focusing on design of the optics, energy deposition in EIR elements, beam-beam effects and machine detector interface issues.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA040
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA048	Calculation of Particle Loss Maps for 2016 RHIC Gold-Gold Run	simulation, operation, kicker, radiation	2181
	Y. Luo, K.A. Drees, W. Fischer, X. Gu, A. Marusic, G. Robert-Demolaize, V. Schoefer 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. In the 2016 RHIC 100~GeV gold-gold (Au-Au) run, 20~mm orbit bumps were installed in the arcs to protect the experimental detectors from abort kicker prefiring. Chronic particle losses were observed in the arcs with these orbit bumps. Those particle losses are mainly from the 78+Au197 and 79+Au196 particles generated from bound-free pair production (BFPP) and electromagnetic dissociation (EMD) associated with the Au-Au collision at the IPs. In this article, we present simulated particle losses of 78+Au197 and 79+Au196 and calculate the particle loss distribution in the ring. The calculated particle loss maps are compared with operational observations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA048
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA079	Model of Statistical Errors in the Search for the Deuteron EDM in the Storage Ring	simulation, experiment, scattering, dipole	2258
	A.E. Aksentyev, V. Senichev FZJ, Jülich, Germany
	In this work we investigate the standard error of the spin precession frequency estimate in an experiment for the search for the electric dipole moment (EDM) of the deuteron using the polarimeter. The basic principle of polarimetry is the scattering of a polarized beam on a carbon target. Since the number of particles in one fill is limited, we must maximize the utility of the beam. This raises the question of sampling efficiency, as the signal, being an oscillating function, varies in informational content. To address it, we define a numerical measurement model, and compare two sampling strategies (uniform and frequency-modulated) in terms of beam-use efficiency. The upshot is the formulation of the conditions necessary for the effective use of the modulated sampling strategy, and the evaluation of its advantage over the uniform strategy. The simulation results are also used to compare two competing analytical models for the standard error of the frequency estimate.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA079
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA096	Detection of H⁰ Particles in MEBT2 Chicane of J-PARC Linac	vacuum, linac, ion, diagnostics	2308
	J. Tamura, H. Ao, T. Maruta, A. Miura, T. Morishita, K. Okabe, M. Yoshimoto JAEA/J-PARC, Tokai-mura, Japan K. Futatsukawa, T. Miyao KEK, Ibaraki, Japan Y. Nemoto Nippon Advanced Technology Co., Ltd., Tokai, Japan
	In the Japan Proton Accelerator Research Complex (J-PARC), H⁰ particles generated by collisions of accelerated H⁻ beams with residual gases are considered as one of the key factors of the residual radiation in the high energy accelerating section of the linac. To diagnose the H⁰ particles, the new beam line for analyzing H⁰ and H⁻ particles was installed in the second medium energy beam transport (MEBT2), which is the matching section from the separated-type drift tube linac (SDTL) to the annular-ring coupled structure linac (ACS). The analysis line consists of four dipole magnets for giving the H⁻ beam chicane orbit, and a wire scanner monitor (WSM) for measuring the horizontal shift of the H⁻ beam. To detect the H⁰ particles, a carbon plate is installed to the WSM. In the beam commissioning, we detected the signals of H⁰ particles penetrating the plate and observed the transition of the signal with various vacuum condition in the SDTL section.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA096
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA123	Status of DESIREE	ion, injection, storage-ring, experiment	2379
	A. Simonsson, M. Björkhage, M. Blom, H. Cederquist, K. Chartkunchand, G. Eklund, A. Källberg, P. Löfgren, H. Motzkau, P. Reinhed, S. Rosén, H.T. Schmidt Stockholm University, Stockholm, Sweden
	DESIREE, the double electrostatic storage rings in Stockholm has been running since 2011(?). In the cold (13 K) environment with an excellent vacuum, very long storage times in both rings have been achieved, which has enabled the preparation of beams in a single quantum state. The status of DESIREE is presented with particular emphasis on measurements of stored beam currents in the sub-nA range. We also discuss the ongoing work towards stochastic cooling of very slow beams.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA123
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA124	The Beam Lines Design for the CERN Neutrino Platform in the CERN North Area and an Outlook on Their Expected Performance	experiment, target, instrumentation, proton	2382
	N.C. Charitonidis, M. Brugger, I. Efthymiopoulos, L. Gatignon, E.M. Nowak, I. Ortega Ruiz CERN, Geneva, Switzerland Y. Karyotakis IN2P3-LAPP, Annecy-le-Vieux, France P.R. Sala Istituto Nazionale di Fisica Nucleare, Milano, Italy
	In the framework of the CERN Neutrino Platform project, extensions to the existing SPS North Area H2 and H4 secondary beam lines, able to provide low-energy charged particles in the momentum range of 0.4 to 12 GeV, have been designed. The parameters of these very low energy beam lines, the expected beam composition as seen by the experiments as well as an outlook on their expected performance are summarized in this paper. Results from Monte-Carlo simulations, important for the optimization of the future instrumentation of the beam lines (serving both the purpose of beam tuning and the experiments' needs for particle identification and momentum measurements), are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA124
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB129	Study of Ionization Cooling with the MICE Experiment	emittance, solenoid, experiment, optics	2874
	C.T. Rogers STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
	The international Muon Ionization Cooling Experiment (MICE) will demonstrate the ionization cooling of muons; the only known technique that can provide high brightness muon beams suitable for applications such as a Neutrino Factory or Muon Collider. MICE is underway at the Rutherford Appleton Laboratory and has recently taken the data necessary to characterise the physical processes that underlie the ionization-cooling effect. Measurements of the change in normalised transverse amplitude are presented in two configurations. The measurements of the ionization-cooling effect are discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB129
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB130	First Results from MICE Step IV	emittance, scattering, simulation, solenoid	2878
	P. Franchini University of Warwick, Coventry, United Kingdom
	Funding: STFC, DOE, NSF, INFN, CHIPP and more Muon beams of low emittance provide the basis for the intense, well characterised neutrino beams of the Neutrino Factory and for lepton-antilepton collisions at energies of up to several TeV at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling - the technique by which it is proposed to reduce the phase-space volume occupied by the muon beam. MICE is being constructed in a series of Steps. The configuration currently in operation at the Rutherford Appleton Laboratory is optimised for the study the properties of liquid hydrogen and lithium hydride that affect cooling. The data taken in the present configuration have been partially analyzed and the available results will be described in detail. submitted by the Speakers Bureau of the collaboration, in charge of finding later a member to prepare and present the contribution
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB130
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB131	Layout of the MICE Demonstration of Muon Ionization Cooling	emittance, betatron, lattice, solenoid	2881
	C. Hunt, J.-B. Lagrange, J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	Funding: STFC, DOE, NSF, INFN, CHIPP and more Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams necessary to elucidate the physics of flavour at the Neutrino Factory and to provide lepton-antilepton collisions up to several TeV at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate muon ionization cooling, the technique proposed to reduce the phase-space volume occupied by the muon beam at such facilities. In an ionization-cooling channel, the muon beam traverses a material (the absorber) loosing energy, which is replaced using RF cavities. The combined effect is to reduce the transverse emittance of the beam (transverse cooling). The configuration of MICE required to deliver the demonstration of ionization cooling is presently being prepared in parallel to the execution of a programme designed to measure the cooling properties of liquid-hydrogen and lithium hydride (Step IV). The design of this final cooling demonstration will be presented together with a summary of the performance of each of its components and the cooling performance of the experiment. submitted by the Speakers Bureau of the collaboration, in charge of finding later a member to prepare and present the contribution
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB131
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK004	Luminosity- and Beam- Induced Backgrounds for the FCC-ee Interaction Region Design	background, photon, luminosity, interaction-region	2914
	G.G. Voutsinas, P. Janot, A.M. Kolano, E. Perez, N.A. Tehrani CERN, Geneva, Switzerland N. Bacchetta INFN- Sez. di Padova, Padova, Italy M. Boscolo INFN/LNF, Frascati (Roma), Italy M.K. Sullivan SLAC, Menlo Park, California, USA
	A preliminary study on machine induced backgrounds has been performed for the proposed FCC-ee interaction region (IR) and proto-detector. Synchrotron radiation has the strongest impact on the present design of the IR and both radiation from dipoles and quadrupoles have been taken into account. The effect of luminosity backgrounds like gamma gamma to hadrons and pair production have also been studied. The impact of background particles on the detector occupancy has also been studied in full simulation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK004
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK016	CEPC-SppC Towards CDR	collider, luminosity, booster, positron	2954
	J. Gao IHEP, Beijing, People's Republic of China
	Funding: supported by National Key Programme for S&T Research and Development (2016YFA0400400), National Natural Science Foundation of China (11575218, 11605211, 11605210, 11505198), Key Research Program of Frontier Sciences, CAS, (QYZDJ-SSW-SLH004) and CAS Center for Excellence in Particle Physics (CCEPP) In this paper we will give an introduction to Circular Electron Positron Collider (CEPC). The scientific background, physics goal, the collider design requirements and the conceptual design principle of CEPC are described. On CEPC accelerator, the optimization of parameter designs for CEPC with different energies, machine lengthes, single ring and crab-waist collision partial double ring, advanced partial double partial ring and fully partial double ring options, etc. have been discussed systematically, and compared. CEPC accelerator baseline and alternative designs have been proposed based on the luminosity potential in relation with the design goals. The sub-systems of CEPC, such as collider main ring, booster, electron positron injector, etc. ave also been introduced. The detector and MDI design have been briefly mentioned. Finally, the optimization design of Super Proton-Proton Collider (SppC), its energy and luminosity potentials, in the same tunnel of CEPC are also discussed. The CEPC-SppC Progress Report (2015-2016) has been published.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK016
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK021	MDI Issues in CEPC Double Ring	quadrupole, radiation, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK029	High Luminosity at VEPP-2000 Collider With New Injector	luminosity, collider, injection, positron	2989
	P.Yu. Shatunov, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov BINP SB RAS, Novosibirsk, Russia E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, D.B. Shwartz NSU, Novosibirsk, Russia
	VEPP-2000 e⁺e⁻ collider at BINP was commissioned and started data taking with two detectors in 2010 with old injection chain. In the middle energy range, where the luminosity was limited by beam-beam effects, the world record values of beam-beam parameter were achieved, ksi=0.12/IP. At the same time the design luminosity value of L = 10³² cm^-2s⁻¹ at top energy (E = 1 GeV per beam) remained unreachable due to limited e⁺ production rate. The injection chain was significantly upgraded in 2013-2016. The experience of upgraded VEPP-2000 complex operation at top energies with Round Colliding Beams will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK029
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK034	Progress in the FCC-ee Interaction Region Magnet Design	solenoid, quadrupole, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK034
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK048	Evaluation and Mitigation of Synchrotron Radiation Background in the eRHIC Ring-Ring Interaction Region	electron, radiation, photon, quadrupole	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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK048
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK095	Evaluation of Longitudinal Beam Impedance in the Beam Gas Ionization Monitor of the CERN-PS Accelerator	impedance, coupling, simulation, wakefield	3163
	N. Nasr Esfahani, T. Kaltenbacher, J.W. Storey, C. Vollinger CERN, Geneva, Switzerland
	The recently observed beam induced heating issues in the BGI monitors of the LHC which could have been occurred due to a strong coupling between the beam and the localized modes at the sensor location showed the general importance of a thorough evaluation of the beam coupling impedance and the corresponding heat deposit in beam monitoring equipments. This paper is devoted to the examination of the beam coupling impedance and beam induced heating for a currently under development beam gas ionization (BGI) monitor which is intended to be a part of the CERN Proton Synchrotron (PS) beam monitoring equipment. Details of the EM and wake field simulations for this BGI monitor together with the RF measurement results and power loss calculations will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK095
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA048	Particle Generation of CapaciTorr Pumps	vacuum, operation, SRF, synchrotron	3363
	S. Lederer, L. Lilje DESY, Hamburg, Germany E. Maccallini, P. Manini, F. Siviero SAES Getters S.p.A., Lainate, Italy
	Non Evaporable Getter pumps have been used since four decades in various scientific and industrial Ultra High and Extremely Ultra High Vacuum applications. For the majority of applications properties like high pumping speed vs. small size, powerless operation and hydrocarbon cleanliness are main aspects for the usage. In addition to this a growing number of applications nowadays also require particle free systems. In this paper we report on investigations on in-vacuum particle creation during the conditioning and activation process of CapaciTorr pumps.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA048
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA129	Arc-Flash Hazard and Protection for Electric Switchboard at NSRRC	site, photon, power-supply, impedance	3571
	T.-S. Ueng, Y.F. Chiu, C.K. Kuan, K.C. Kuo, Y.-C. Lin NSRRC, Hsinchu, Taiwan
	During the operation of electrical equipment the arc-flash accident could damage the equipment and endanger the working personnel. In order to prevent this type of accidents from happening and to minimize the damages, a delicate setup is being installed inside the electric switchboard for suppressing the accidents at the initial stage of arcing at NSRRC's power system. The installed device includes the arc sensor, the smoke detector, the high rupturing capacity fuse, the circuit breaker and the protection relay. Further improvement on preventing the arc-flash accidents is also under study.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA129
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA147	Iron-Free Detector System for the Linear Collider with Multiple Return Solenoids	solenoid, collider, linear-collider, emittance	3615
	A.A. Mikhailichenko Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	We investigate the Iron-free magnetic system for implementation in a detector for future Linear Collider. One peculiarity is in usage of many small-diameter solenoids for the flux return. Machine-detector interface is discussed also.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA147
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB084	Integration of the Full-Acceptance Detector Into the JLEIC	dynamic-aperture, ion, collider, solenoid	3912
	G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang JLab, Newport News, Virginia, USA Y.M. Nosochkov SLAC, Menlo Park, California, USA M.-H. Wang Self Employment, Private address, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515. For physics requirements, the JLEIC (Jefferson Lab Electron Ion Collider) has a full-acceptance detector, which brings many new challenges to the beam dynamics integration. For example, asymmetric lattice and beam envelopes at interaction region (IR), forward detection, and large crossing angle with crab dynamics. Also some common problems complicate the picture, like coupling and coherent orbit from detector solenoid, high chromaticity and high multipole sensitivity from low beta-star at interaction point (IP), collision mode with different energy and ion species. Meanwhile, to get a luminosity level of a few 10³³ cm^-2ses⁻¹, small beta-star are necessary at the IP, which also means large beta in the final focus area, chromaticity correction sections, etc. This sets a constraint on the field quality of magnets in large beta areas, in order to ensure a large enough dynamic aperture (DA). In this context, limiting multipole components of magnets are surveyed to get a standard line. And continuously, multipole magnets as dedicated correctors are studied to provide semi-local corrections of specific multipole components beyond the standard line.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB084
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB105	Design and Operation of the Integrated 1.3 GHz Optical Reference Module with Femtosecond Precision	laser, controls, operation, FEL	3963
	T. Lamb, L. Butkowski, E.P. Felber, M. Felber, M. Fenner, S. Jabłoński, T. Kozak, J.M. Müller, P. Prędki, H. Schlarb, C. Sydlo, M. Titberidze, F. Zummack DESY, Hamburg, Germany
	In modern Free-Electron Lasers like FLASH or the European XFEL, the short and long-term stability of RF reference signals gains in importance. The requirements are driven by the demand for short FEL pulses and low-jitter FEL operation. In previous publications, a novel, integrated Mach-Zehnder Interferometer based scheme for a phase detector between the optical and the electrical domain was presented and evaluated. This Laser-to-RF phase detector is the key component of the integrated 1.3 GHz Optical Reference Module (REFM-OPT) for FLASH and the European XFEL. The REFM-OPT will phase-stabilize 1.3 GHz RF reference signals to the pulsed optical synchronization systems in these accelerators. Design choices in the final hardware configuration are presented together with measurement results and a performance evaluation from the first operation period in the European XFEL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB105
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB109	Fs Level Laser-to-RF Synchronization at REGAE	laser, timing, electron, electronics	3972
	M. Titberidze, M. Felber, T. Lamb, H. Schlarb, C. Sydlo DESY, Hamburg, Germany R.A. Loch MPSD, Hamburg, Germany
	The Relativistic Electron Gun for Atomic Exploration (REGAE) is a unique linear accelerator capable of producing ultrashort (~ 10 fs) electron bunches for studying fast processes in matter by means of ultrafast electron diffraction (UED) experiments. Additionally, REGAE is suitable for upcoming external injection experiments for laser wakefield acceleration (LWFA). In order to carry out both mentioned experiments, it is crucial to achieve fs level stability in terms of Laser-to-RF synchronization. In this paper we present an advanced laser-to-RF synchronization scheme based on integrated Mach-Zehnder modulator. The setup demonstrated the Titanium Sapphire photo-injector laser synchronization with 11 fs (rms) precision in the bandwidth up to 100 kHz. Long term timing drift measurements showed unprecedented peak-to-peak stability of 31 fs (7 fs rms) over 43 hours of measurement time. In addition, AM-PM coefficient of the MZM based laser-to-RF synchronization setup has been evaluated and showed a factor of 10 improved performance compared to conventional direct conversion based laser synchronization setup.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB109
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB119	Study on a Time-Domain Spectroscopy System for Coherent Terahertz Pulse Spectrum Measurement from 5 MeV Electron Beam	laser, radiation, electron, polarization	4003
	R. Yanagisawa, T. Toida Waseda University, Tokyo, Japan K. Kan ISIR, Osaka, Japan K. Sakaue Waseda University, Waseda Institute for Advanced Study, Tokyo, Japan M. Washio RISE, Tokyo, Japan
	Funding: This work was supported by a research granted from The Murata Science Foundation and JSPS KAKENHI 26286083. Terahertz wave, expected to apply spectral analysis and imaging, has recently developed both source and detector components. For the terahertz source, the coherent radiation from electron linac is expected to be the high power terahertz source. At Waseda University, we have been studying high quality electron beam generation using Cs-Te photocathode RF-Gun and its application. We tried to generate terahertz wave by the coherent radiation and to measure its spectrum by a time-domain spectroscopy (TDS) technique. Adopting this technique, ultra-short laser pulse is needed as probe light. A terahertz waveform appears by delaying the timing of probe pulse. A spectrum of terahertz wave is also led by the waveform, by using the Fourier transform. We succeeded in constructing the probe laser system operating at 119 MHz repetition rate. The pulse duration was compressed down to 190 fs (FWHM) by using pulse compressor. We also succeeded in measuring a terahertz radiation from a photoconductive antenna. In this conference, we will report the outline of our terahertz TDS system, recent progress of our laser system, and terahertz wave generation and detection, with the future prospects.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB119
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB132	MCP Based Detectors Installation in European XFEL	photon, ion, radiation, laser	4031
	E. Syresin, O.I. Brovko, A.Yu. Grebentsov JINR, Dubna, Moscow Region, Russia W. Freund XFEL. EU, Hamburg, Germany J. Grünert European XFEL, Schenefeld, Germany M.V. Yurkov DESY, Hamburg, Germany
	An important task of the photon beam diagnostics at the European XFEL is providing reliable tools for measurements aiming at the search for and fine tuning of the amplification process in the SASE FEL. Radiation detectors based onμchannel plates (MCP) were prepared for such measurements. These detectors operate in a wide dynamic range from the level of spontaneous emission to the saturation level (between a few nJ to 25 mJ), and in a wide wavelength range from 0.05 nm to 0.4 nm for SASE1 and SASE2, and from 0.4 nm to 5.1 nm for SASE3. Photon pulse energies are measured at the MCP anode and with a photodiode. The transverse photon beam profile is measured by an MCP imager with phosphor screen anode. Three MCP devices are being installed, one in each of the three FEL beamlines (SASE1, SASE2, and SASE3). The units for SASE1 and SASE3 were already installed in the XFEL tunnel, and the technical commissioning of the MCP detectors and their electronics is progressing. Calibration and acceptance test experiments with beam are scheduled for early 2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB132
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB149	Characterization of the THz Radiation-Based Bunch Length Measurement System for the NSRRC Photoinjector	radiation, laser, electron, software	4080
	C.C. Liang, B.Y. Chen, C.H. Chen, M.C. Chou, S. Fann, C.S. Huang, N.Y. Huang, J.-Y. Hwang, W.K. Lau, A.P. Lee, T.Y. Lee, W.Y. Lin, T.-C. Yu NSRRC, Hsinchu, Taiwan
	A part of high brightness photo-injection (HBI) project at NSRRC is intending to adopt Coherent Transition Radiation (CTR) and Coherent Undulator Radiation (CUR) to generate THz radiation with an ultrashort electron bunch. Such high intensity THz sources allow the THz spectrum to be conducted easily with a THz interferometer and a Golay cell detector. Furthermore, the radiation spectrum carries information of the electron distribution which allows ultrashort electron bunch length measurements. For verifying correct measuring procedure during the CTR and CUR experiments, a conventional THz radiation generated by optical rectification from a ZnTe crystal has been performed. The produced THz pulse was sent into a Michelson interferometer which is designed for the autocorrelation of the intense, sub-mm and mm-wavelength, spatially-coherent radiation pulses. The THz spectrum can be further obtained from the interferogram by the Fourier transform process. In such way, the THz spectrum can be investigated if the result is satisfactory and can be applied on the THz CTR and CUR experiments for the next step.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB149
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK095	High Power X-Band Generation Using Multiple Klystrons and Pulse Compression	klystron, controls, vacuum, network	4311
	B.J. Woolley, T. Argyropoulos, N. Catalán Lasheras, G. McMonagle, S.F. Rey, I. Syratchev, W. Wuensch CERN, Geneva, Switzerland D. Esperante Pereira IFIC, Valencia, Spain J. Tagg National Instruments Switzerland, Ennetbaden, Switzerland M. Volpi The University of Melbourne, Melbourne, Victoria, Australia
	CERN has constructed and is operating a new X-band test stand containing two pairs of 12 GHz, 6 MW klystrons. By power combination through hybrid couplers and the use of pulse compressors, up to 45 MW of peak power can be sent to any of 4 test slots at pulse repetition rates up to 400 Hz. The test stand is dedicated to RF conditioning and testing of high gradient accelerating structures for the CLIC study and also future X-band FELs. Operations have been ongoing for a few months, with initial operation dedicated to control algorithm development. Significant progress has been made in understanding the unique challenges of high power RF combination and phase switching using RF hybrids.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK095
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK109	The RF Distribution System for the ESS	cavity, linac, neutron, insertion	4352
	T.R. Edgecock, N. Turner University of Huddersfield, Huddersfield, United Kingdom P. Aden, D. Naeem, R. Smith STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom A. Sunesson, R.A. Yogi ESS, Lund, Sweden
	The RF distribution system for the European Spallation Source will be one of the largest systems ever built. It will distribute the power from 146 power sources to the two types of ESS cavity at two different frequencies and will use one line per cavity for resilience. It will consist of a total of around 3.5 km of waveguide and coaxial line and over 1500 hundred bends. It is designed to transport this RF power over a distance of up to 40m per line, while minimising losses, avoiding reflections and allowing the monitoring of performance. This contribution will give an overview of the design of the system and its status. Installation is due to start in September 2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK109
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA010	Electron Cloud Simulations for the Main Ring of J-PARC	electron, simulation, proton, vacuum	4436
	B. Yee-Rendón, R. Muto, K. Ohmi, K. Satou, M. Tomizawa, T. Toyama KEK, Ibaraki, Japan
	The simulation of beam instabilities is a helpful tool to evaluate potential threats against the machine protection of the high intensity beams. At Main Ring (MR) of J-PARC, signals related to the electron cloud have been observed during the slow beam extraction mode. Hence, several studies were conducted to investigate the mechanism that produces it, the results confirmed a strong dependence on the beam intensity and the bunch structure in the formation of the electron cloud, however, the precise explanation of its trigger conditions remains incomplete. To shed light on the problem, electron cloud simulations were done using an updated version of the computational model developed from previous works at KEK. The code employed the signals of the measurements to reproduce the events seen during the surveys.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA010
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA044	Detector Structure Development Using Active And Passive Thermography	target, laser, cavity, experiment	4531
	E. Rosenthal, D. Grunwald, G. Natour Forschungszentrum Jülich GmbH, Central Institute of Engineering, Electronics and Analytics, Jülich, Germany
	During the development and production of the mechanical support structures of the PANDA-Micro-Vertex-Detector(MVD)* experiments of passive and active thermography were applied and shown. The combination of mostly carbon-based materials enables the development of lightweight structures, which satisfy the mechanical stability and thermal requirements. The carrier structure of the MVD stripe detector is mainly composed of carbon foams, high fiber content CFC materials and PMI-based foams. This enables to selectively cool areas where heat is generated and to decouple them from the temperature-sensitive areas of the sensor system. Passive thermography is used during our development work mainly to validate the results of thermal simulations, for design optimization and for the functional control of the carrier structure. Additionally active thermography allows us to identify anomalies and thermal disturbances, which remain unnoticed in static processes. Also the investigation and characterization of adhesive layers are possible. For this purpose we developed special software algorithms which are sensitive to small-scale differences in temperature conductivity. * PANDA Collaboration: W. Erni et al., arXiv: 1207.6581
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA044
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA079	First Optics Design and Beam Performance Simulation of PRAE: Platform for Research and Applications With Electrons at Orsay	electron, instrumentation, optics, gun	4637
	A. Faus-Golfe, S. Barsuk, B. Borgo, D. Douillet, M. El Khaldi, L. Garolfi, A. Gonnin, M. Langlet, P. Lepercq, M. Omeich, V. Puill, C. Vallerand LAL, Orsay, France P. Ausset, M. Ben Abdillah, S. Blivet, P. Duchesne, B. Genolini, M. Hoballah, G. Hull, R. Kunne, C. Le Galliard, J. Lesrel, D. Marchand, E. J-M. Voutier IPN, Orsay, France A. Hrybok, A. Pastushenko National Taras Shevchenko University of Kyiv, Radiophysical Faculty, Kiev, Ukraine A. Vnuchenko IFIC, Valencia, Spain
	The PRAE project aims at creating a multidisciplinary R&D facility in the Orsay campus gathering various scientific communities involved in radiobiology, subatomic physics, instrumentation and particle accelerators around an electron accelerator delivering a high-performance beam with energy up to 70 MeV and later 140 MeV, in order to perform a series of unique measurements and future challenging R&D. In addition PRAE will provide a major education and training asset for students and engineers yielding a regional instrument of advanced technology at the heart of the scientific, technological and academic complex of the Paris-Saclay University. In this paper we report the first optics design and performance evaluations of such a multidisciplinary machine, including a first description of future experiments and the required beam instrumentation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA079
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA081	Radiation Tests of Aerospace Components at ELBE	electron, radiation, experiment, gun	4641
	Ch. Schneider, D. Bemmerer, P. Michel, D. Stach HZDR, Dresden, Germany
	The cw electron accelerator ELBE operates mainly in the beam energy range 6 to 32 MeV and beam current range 1μA to 1mA. For most experiments a thermionic gun is used as electron source. The cw electron pulse structure so as the pulse charge is realized by applying electrical pulses with specific amplitudes and frequencies on the grid of the gun. The standard cw operation frequency is 13 MHz but can be divided sequentially by the factor 2 down to 101 kHz. For very special pulse structures a so called single pulser module exist performing different patterns also with dark current suppression via a macro pulser gate. For evaluating the performance and hardness under irradiation of e.g. aerospace components much lower doses respectively currents lower than the μA range are required. Furthermore reproducible and stable doses in a specific area for consecutively radiation of samples are necessary. In the presentation the investigations and concepts used at ELBE for the irradiation of different aerospace components are described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA081
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA091	Diagnostics Methods for the Medium Energy Proton Beam Extracted by the TOP IMPLART Linear Accelerator	proton, linac, radiation, diagnostics	4673
	M. Vadrucci, A. Ampollini, P. Nenzi, L. Picardi, C. Ronsivalle, E. Trinca ENEA C.R. Frascati, Frascati (Roma), Italy E. Cisbani, F. Ghio ISS, Rome, Italy M. Marinelli, G. Prestopino, G. Verona Rinati INFN - Roma Tor Vergata, Roma, Italy C. Placido University of Rome La Sapienza, Rome, Italy
	Funding: This material is based upon work supported by the Regione Lazio/Italy The Italian TOP IMPLART project aims to develop the first proton linear accelerator for cancer radiotherapy. A 150MeV proton LINAC is under construction at the ENEA Frascati research center: currently the machine is composed by a 7MeV injector operating at 425MHz and four 3GHz SCDTL modules producing a proton beam of 35MeV. Operational procedures for irradiation of samples need careful measurements of average beam current, transverse distribution and pulse charge by different monitor types placed along the beam line. The injected current in the high frequency segment of the accelerator is measured by a Fast Current Transformer (FCT) at the entrance of the SCDTL modules and the pulsed current of the accelerated beam is measured by a second FCT, placed in air, at the exit. The output proton beam shape and intensity are measured by an integral ionization chamber, a double (XY) multistrip ionization chamber, a synthetic single crystal diamond detector and a Faraday cup. In this work, the results of these multiple diagnostic tools applied to different operating conditions of the machine are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA091
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA098	Development of a 3.95 Mev X-Band Linac-Driven X-Ray Combined Neutron Source	neutron, target, experiment, linac	4692
	J.M. Bereder, K. Dobashi, Y. Mitsuya, M. Uesaka The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan M. Ishida, Y. Ohshima PWRI, Ibaraki, Japan J. Kusano Accuthera Inc., Kawasaki, Kanagawa, Japan Y. Takahashi The University of Tokyo, Tokyo, Japan Y. Tanaka The University of Tokyo, Institute of Industrial Science, Tokyo, Japan
	Funding: Council for Science, Technology and Innovation (CSTI), Cross-Ministrial Strategic Innovation Promo-tion Program (SIP), Japan Science and Technoogy Agency (JST) The existing non-destructive inspection method employed for concrete structures uses high energy X-rays to detect internal flaws in concrete structures and iron reinforcing rods. In addition to this conventional method, the authors are developing an innovative inspection system that uses a mobile compact linac-driven neutron source that utilizes neutron backscattering, to measure the moisture content in concrete structures and estimate the corrosion probability distribution of iron reinforcing rods. By combining the knowledge of the moisture distribution in concrete structures with the information of its inner structure, the remaining life of concrete structures can be estimated. Further experiments will be conducted in the laboratory, and the moisture detection experiment in the real bridge is scheduled for 2017.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA098
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA102	Structural Analysis and Evaluation of Actual PC Bridge Using 950 keV/3.95 MeV X-Band Linacs	linac, site, experiment, target	4701
	H. Takeuchi, R. Yano The University of Tokyo, Tokyo, Japan K. Dobashi, Y. Mitsuya, M. Uesaka The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan M. Ishida, Y. Ohshima PWRI, Ibaraki, Japan J. Kusano Accuthera Inc., Kawasaki, Kanagawa, Japan I. Ozawa The University of Tokyo, The School of Engineering, Tokyo, Japan
	Funding: This work was supported by Council for Science, Technology and Innovation(CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP) (Funding agency: JST). In Japan, bridges constructed in the highly economic growth era are facing to aging problem and advanced maintenance methods have been strongly required recently. To meet this demand, we develop the on-site inspection system using 950 keV/3.95 MeV X-band (9.3 GHz) linac X-ray sources. These systems can visualize in seconds the inner states of bridge, including cracks of concrete, location and state of tendons (wires) and other imperfections. We focused on the inspection for wires which are critical to the safety of bridge. At the on-site inspections, the X-ray inspection system exhibited sufficient accuracy to detect the wire's corrosion. We also evaluated the maximum thickness of concrete to which our system can be applied. Using the 950 keV system, we conducted on-site inspection for real bridges and performed structural analysis to evaluate the bearing capacity of the bridge using finite element method. We plan to apply the 3.95 MeV linac for actual bridge inspection to extend the applicable range in 2017. For accurate visualization, the parallel motion CT technique for bridge inspection is in progress. Mitsuru Ueaska et al, On-site nondestructive inspection by upgraded portable 950keV/3.95MeV X-band linac x-ray sources, J. Phys. B: At. Mol. Opt. Phys. 47(2014) 234008 (9pp)
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA102
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA128	Preliminary Test Setup of the Metu Defocusing Beam Line, an Irradiation Test Facility in Turkey	proton, quadrupole, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA128
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA129	Spatial Distributions of natU(n, f), 238U(n, g) Reaction Rates in Spallation Neutron Fields Produced by Deuterons and 12C Ions on the Massive Uranium Target	target, neutron, experiment, simulation	4753
	A. Zhadan, V.V. Sotnikov, V.A. Voronko NSC/KIPT, Kharkov, Ukraine S.I. Tyutyunnikov JINR, Dubna, Moscow Region, Russia P. Zhivkov INRNE, Sofia, Bulgaria
	The results of the experiments carried out within the framework of Energy and Transmutation of RAW at JINR NUCLOTRON accelerator are presented. The target assembly QUINTA consisting of 512 kg natural uranium was irradiated by deuteron and carbon beams with energies 1, 2, 4 and 8 GeV (deuterons), 24 and 48 GeV (carbon). Spatial distribution and total number of capture reaction and fission reaction rates was obtained using the activation technique. The integral number of fissions reactions in the volume of uranium target remains approximately constant within our statistical errors for 1, 2, 4 and 8 GeV deuteron beams and for 24 and 48 GeV carbon beams (per one primary particle and per 1 GeV of beam energy). For the integral number of capture reactions with deuteron beams we have seen maximum at 2 GeV. Some of the obtained experimental data was analyzed using the MCNPX transport code. For spatial distribution of reaction rates in case of 4 and 8 GeV deuteron beams we have seen a discrepancy between the experimental and calculated values in backward direction.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA129
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA136	Non-Invasive Online Beam Monitor Using LHCb VELO	proton, laser, medical-accelerators, electronics	4780
	R. Schnuerer The University of Liverpool, Liverpool, United Kingdom C.P. Welsch, S.L. Yap, H.D. Zhang Cockcroft Institute, Warrington, Cheshire, United Kingdom
	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 Online beam monitoring is essential for ion beam therapy to assure effective delivery of the beam and maintain patient safety for cancer treatment. One candidate for such a monitoring device is the LHCb Vertex Locator (VELO) detector. It is a position sensitive silicon detector with an advantageous semi-circular design which enables approaching the core of the beam without interfering with it. In this contribution, tests using an infrared laser to calibrate the detector and obtain information about its dynamic range, spatial and time resolution will be discussed. Initial results from using the detector at the 60 MeV proton therapy beamline at the Clatterbridge Cancer Centre (CCC), UK are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA136
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA137	A Monte Carlo Approach to Imaging and Dose Simulations in Realistic Phantoms Using Compact X-Ray Source	simulation, photon, electron, radiation	4783
	E. Skordis, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom E. Skordis, V. Vlachoudis CERN, Geneva, Switzerland C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	X-ray emitters are amongst the most widely used tools in medicine. Based on compact electron beams, they are utilised for a range of applications, including medical imaging and cancer treatment. The optimisation of a specific X-ray source relies on detailed simulation studies into the achievable resolution and intensity distribution. Monte Carlo (MC) codes are widely used in the medical community for dose estimation to patients and the environment. They are also ideally suited for simulating 3D intensity distributions in realistic environments. This demands accurate and reliable physical models capable of handling all components of the expected radiation field. In this paper the capabilities of the FLUKA MC code to simulate complex X-ray sources are presented. Advanced phantoms, based on imported DICOM format, are used to evaluate the dose to relevant areas, including the patient, individual organs and the treatment room. It is also shown how they can provide a good basis to reproduce radiography images by scoring photon fluencies.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA137
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA138	Optimization of Medical Accelerators within the OMA Project	proton, ion, network, medical-accelerators	4787
	C.P. Welsch The University of Liverpool, Liverpool, United Kingdom C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement No 675265. Although significant progress has been made in the use of particle beams for cancer treatment, an extensive research and development program is still needed to maximize the healthcare benefits from these therapies. The Optimization of Medical Accelerators (OMA) is the aim of a new European Network. OMA joins universities, research centers and clinical facilities with industry partners to address the challenges in treatment facility design and optimization, numerical simulations for the development of advanced treatment schemes, and in beam imaging and treatment monitoring. This contribution gives an overview of the 15 R&D projects that are covered within the project and reports on initial results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA138
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRYAA1	Discovery of the Island of Stability for Super Heavy Elements	neutron, target, ion, heavy-ion	4848
	Y.T. Oganessian JINR, Dubna, Moscow Region, Russia
	The existence of a region of hypothetical Super Heavy Elements (SHE) forming region (island) with high stability in the vicinity of the doubly magic nucleus 298 114 was postulated in the mid-1960s. For more than 30 years, scientists hard searched for naturally occurring SHEs and unsuccessfully attempted to synthesize them using heavy ion accelerators. Over the past 15 years the breakthroughs in heavy element synthesis has achieved, using rare actinide targets irradiated with 48Ca beams. More than 52 neutron-rich nuclei including the isotopes of the new element 113-118 and their alpha-decay product where synthesized for the first time. SHE with Z> 40% larger than that of Bi show an impressive extension in nuclear survival: the map of the nuclides have extended up to mass number 294, the 7th row of the periodic Table have completed. The talk will cover this achievement and will give an outlook for the field including any plans at the new facilities: SHE-Factory, SPIRAL-2 and others.
	Slides FRYAA1 [9.750 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-FRYAA1
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOOCB1

Time-Resolved Energy Spread Studies at the ANKA Storage Ring

storage-ring, timing, radiation, synchrotron

53

B. Kehrer, E. Blomley, M. Brosi, E. Bründermann, A.-S. Müller, M.J. Nasse, M. Schedler, M. Schuh, M. Schwarz, P. Schönfeldt, N.J. Smale, J.L. Steinmann
KIT, Karlsruhe, Germany
N. Hiller
PSI, Villigen PSI, Switzerland
P. Schütze
DESY, Hamburg, Germany

Funding: This work has been supported by the Initiative and Networking Fund the Helmholtz Association under contract number VH-NG-320 and the BMBF under contract numbers 05K13VKA and 05K16VKA.
Recently, a new setup for measuring the beam energy spread has been commissioned at the ANKA storage ring at the Karlsruhe Institute of Technology. This setup is based on a fast-gated intensified camera and detects the horizontal profiles of individual bunches in a multi-bunch environment on a single-turn base. As the radiation source point is located in a dispersive section of the storage ring, this allows time-resolved studies of the energy spread. These studies are of particular interest in the framework of short-bunch beam dynamics and the characterization of instabilities. The system is fully synchronized to other beam diagnostics devices allocated in various places along the storage ring, such as the single-shot electro-optical spectral decoding setup or the turn-by-turn terahertz detection systems. Here we discuss the results of the synchronous measurements with the various systems with special emphasis on the energy spread studies.

Slides MOOCB1 [6.514 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCB1

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOOCB3

Intensity Interferometer to Measure Bunch Length at SPEAR3

photon, optics, electron, storage-ring

60

W.J. Corbett
SLAC, Menlo Park, California, USA
T.M. Mitsuhashi
KEK, Ibaraki, Japan

Electron bunch length in a storage ring is typically measured with streak cameras, electro-optic devices or non-linear cross-correlation techniques with a range of system complexity, signal-to-noise ratios and cost. Another straight-forward method is to construct an 'intensity interferometer' utilizing a coincidence detector to record simultaneous photon arrival events. In this configuration, visible SR light is passed through a narrow bandpass filter followed by a small pinhole to generate a stream of single-mode monochromatic wavepackets. As the interferometer delay is scanned across an electron bunch, two-photon events occurring within the longitudinal coherence time of the light cause a reduction in the measured coincidence rate. The resulting autocorrelation of the optical pulse duration reveals the electron bunch length, independent of synchrotron oscillation motion. In this paper we comment on the theory and report on preliminary measurements carried out at SPEAR3.

Slides MOOCB3 [2.606 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOOCB3

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB025

Measurement of the Polarisation of Coherent Smith-Purcell Radiation in the SOLEIL Linac

radiation, polarization, linac, experiment

129

N. Delerue, S. Jenzer, V. Khodnevych
LAL, Orsay, France
N. Hubert, M. Labat, J.-P. Pollina, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France

Funding: CNRS/IN2P3, Université Paris-Sud and ANR (contract ANR-12-JS05-0003-01)
SPESO is an experiment installed in the Linac of Synchrotron SOLEIL to study the Coherent Smith-Purcell radiation produced when a grating is approached from the beam. The detectors used to measure this radiation are mounted on 3-translation axis and 2 rotation axis. This allows measurements of the radiation emission map around the grating. In addition a polarizer has been added in 2016 allowing to study the two polarization components of the radiation in this map. Preliminary results of this mapping will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB025

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB026

Study of a Smith-Purcell Radiation-Based Longitudinal Profile Monitor at the CLIO Free Electron Laser

radiation, electron, laser, free-electron-laser

132

V. Khodnevych, N. Delerue, S. Jenzer, H. Roesch
LAL, Orsay, France
J.P. Berthet, F. Glotin, J.-M. Ortega, R. Prazeres
LCP/CLIO, Orsay, Cedex, France
N. Jestin
CLIO/ELISE/LCP, Orsay, France

Funding: CNRS and ANR (contract ANR-12-JS05-0003-01)
We report on measurements of Coherent Smith-Purcell radiation at the CLIO Free Electron Laser. Smith-Purcell radiation is emitted when a grating is brought close from a bunch of relativistic particles. When the bunch is sufficiently short coherent radiation is emitted. This coherent radiation encodes the longitudinal form factor of the bunch and can therefore be used as a longitudinal profile monitor. With its short pulses and high charge the 45 MeV Linac of CLIO is a good location to test advanced longitudinal profile diag- nostics. The results will be compared with measurements using the RF dephasing. induced energy dispersion.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB026

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB027

Preparation of CVD Diamond Detector for fast Luminosity Monitoring of SuperKEKB

luminosity, simulation, monitoring, target

135

C.G. Pang, P. Bambade, D. El Khechen, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault
LAL, Orsay, France

The SuperKEKB e⁺-e⁻ collider aims to reach a very high luminosity of 8×10 ³⁵ cm'2s'1, using highly focused ultra-low emittance bunches colliding every 4ns. To meet the requirement of the dithering feedback system used to stabilize the horizontal orbit at the IP (interaction point), a relative precision of 10 '3 in 1ms is specified for the fast luminosity monitoring, which can be in principle achieved thanks to the large cross section of the radiative Bhabha process. This paper firstly presents the fraction of detected Bhabha scattering positrons with a new beam pipe arrangement coupled with a Tungsten radiator to be installed in the Low Energy Ring; Then the characteristics of signals from a sCVD diamond detector with thickness of 140'm coupled with a broadband current amplifier were studied based on tests with a Sr-90 source; Finally, simulated results for the reconstructed luminosity and the relative precision with different assumed luminosities are also reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB027

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB029

Experimental Study of Halo Formation at ATF2

vacuum, simulation, scattering, electron

142

R.J. Yang, P. Bambade, A. Faus-Golfe, V. Kubytskyi, S. Wallon
LAL, Orsay, France
A. Aryshev, T. Naito
KEK, Ibaraki, Japan
N. Fuster-Martínez
IFIC, Valencia, Spain

For Accelerator Test Facility 2 (ATF2), as well as other high-intensity accelerators, beam halo has been an important aspect reducing the machine performance and activating the components. It is imperative to clearly understand the mechanisms that lead to halo formation and to test the avail- able theoretical models with an adequate experiment setup. In this paper, the experimental measurement of the beam halo formation from beam gas scattering is presented. The upgrading of an OTR/YAG screen monitor for future halo study is also introduced.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB029

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB038

Research and Development of Diamond Based Beam Monitoring and Diagnostics Systems at the S-DALINAC

monitoring, simulation, FPGA, electron

163

A. Rost, T. Galatyuk
TU Darmstadt, Darmstadt, Germany
T. Galatyuk, J. Pietraszko
GSI, Darmstadt, Germany

Funding: This work has been supported by the DFG through GRK 2128 and VH-NG-823.
For future experiments with the HADES and CBM detectors at FAIR in Darmstadt, a radiation hard and fast beam detector is required. The beam detector has to perform precise T0 measurements (σ_T0 < 50 ps) and should also offer beam monitoring capabilities. These tasks can be fulfilled by utilizing single-crystal Chemical Vapor Deposition (scCVD) diamond based detectors. For research and development of such detectors, a test set-up will be installed at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC) of TU Darmstadt. A read-out system for a beam monitoring and diagnostics system is currently under development. It is based on the already well established TRB3 platform, which can provide FPGA based signal discriminators and high precision FPGA-TDCs with on-line monitoring capabilities. In this contribution the concept and the performance of a prototype beam monitoring system will be discussed. Furthermore the preparatory work, with particular focus on the beam-line simulations, for a multipurpose beam detector test set-up at the S-DALINAC will be addressed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB038

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB056

4-Channel Single Shot and Turn-by-Turn Spectral Measurements of Bursting CSR

radiation, synchrotron, simulation, storage-ring

231

J.L. Steinmann, E. Blomley, M. Brosi, E. Bründermann, M. Caselle, B. Kehrer, A.-S. Müller, L. Rota, M. Schuh, P. Schönfeldt, M. Siegel, M. Weber
KIT, Karlsruhe, Germany

The test facility and synchrotron radiation source ANKA at the Karlsruhe Institute of Technology (KIT) in Karlsruhe, Germany, can be operated in a short-bunch mode. Above a threshold current, the high charge density leads to microwave instabilities and the formation of sub-structures. These time-varying sub-structures on bunches of picosecond duration lead to the observation of bursting coherent synchrotron radiation (CSR) in the terahertz (THz) frequency range. The spectral information in this range contains valuable information about the bunch length, shape and sub-structures. We present recent measurements of a spectrometer setup that consists of 4 ultra-fast THz detectors, sensitive in different frequency bands, combined with the KAPTURE readout system developed at KIT for studies requiring high data throughput. This setup allows to record continuously the spectral information on a bunch-by-bunch and turn-by-turn basis. This contribution describes the potential of time-resolved spectral measurements of the short-bunch beam dynamics.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB056

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB059

Energy Chirp Measurements by Means of an RF Deflector: a Case Study the Gamma Beam Source LINAC at ELI-NP

electron, linac, brightness, simulation

242

L. Sabato
U. Sannio, Benevento, Italy
P. Arpaia, A. Liccardo
Naples University Federico II, Science and Technology Pole, Napoli, Italy
A. Mostacci, L. Palumbo
University of Rome La Sapienza, Rome, Italy
A. Variola
INFN/LNF, Frascati (Roma), Italy

RF Deflector (RFD) based measurements are widely used in high–brightness electron LINAC around the world in order to measure the ultra–short electron bunch length. The RFD provides a vertical kick to the particles of the electron bunch according to their longitudinal positions. In this paper, a measurement technique for the bunch length and other bunch proprieties, based on the usage of an RFD, is proposed. The basic idea is to obtain information about the bunch length, energy chirp, and energy spread from vertical spot size measurements varying the RFD phase, because they add contributions on this quantity. The case study is the Gamma Beam System (GBS), the Compton Source being built in the Extreme Light Infrastructure–Nuclear Physics (ELI–NP) facility. The ELEctron Generation ANd Tracking (ELEGANT) code is used for tracking the particles from RFD to the measurement screen.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB059

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB061

DAΦNE BTF Improvements of the Transverse Beam Diagnostics

software, linac, timing, positron

250

P. Valente
INFN-Roma, Roma, Italy
B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
INFN/LNF, Frascati (Roma), Italy

The DAΦNE BTF (beam-test facility) can provide electrons and positrons, tuning at runtime different beam parameters: energy (from about 50 MeV up to 750 MeV for e^- and 540 MeV for e+), intensity (from single particle up to 10¹⁰/bunch) and pulse length (in the range 1.5-40 ns) up to 49 Hz, depending on the operations of the DAΦNE collider. The beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad (downstream of the vacuum beam-pipe exit window), matching the user needs. We describe of the BTF beam transverse monitor systems based on FitPIX detectors, operating in bus synchronization mode externally timed to the BTF beam. We also describe our custom software allowing the acquisition and synchronization of the beam diagnostics with the users data, using TCP/IP calls to MEMCACHED. The performance of the system in a variety of beam intensity, energy and focusing conditions is reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB061

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB073

Measurement of Electron-Bunch Length Using Coherent Radiation in Infrared Free-Electron Laser Facilities

electron, FEL, radiation, laser

288

N. Sei, H. Ogawa
AIST, Tsukuba, Ibaraki, Japan
K. Hayakawa, Y. Hayakawa, K. Nogami, T. Sakai, T. Tanaka
LEBRA, Funabashi, Japan
H. Ohgaki, H. Zen
Kyoto University, Kyoto, Japan

Funding: This study was financially supported by JSPS KAKENHI Grant Number JP16H03912.
We have studied techniques evaluating bunch length of micropulses in an electron beam. The bunch length of the electron beam is an important parameter for free-electron laser (FEL) facilities with linear accelerators. In order to obtain high FEL gain at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University and at Kyoto University Free Electron Laser (KU-FEL), the electron-bunch length is compressed to less than 1 ps in their undulator sections. Using the compressed electron beams, intense terahertz lights were generated by coherent radiation. The power of the coherent radiation was more than 50 micro-joule per electron-beam macropulse. We can extract the information of the bunch length of the electron-beam micropulse from the intense coherent radiation by using narrow-band diode detectors. In this presentation, experimental results of the measurements of the root-mean-square electron-bunch length using the coherent radiation at LEBRA* and KU-FEL** will be reported.
*: N. Sei et al., J. Opt. Soc. Am. B, 31, 2150 (2014).
**: N. Sei et al., Nucl. Instrum. Methods Phys. Res., Sect. A, 832, 208 (2016).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB073

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB074

Low Intensity Electron Beam Controlling and Monitoring

electron, linac, controls, experiment

292

L. Yu, Y. Li, Y.F. Sui, J.H. Yue
IHEP, Beijing, People's Republic of China

To calibrating a cosmic-ray detector, a low beam current accelerator has been built to generate ultra low intensity electron beams at Institute of High Energy Physics (IHEP). The minimum beam charge obtained was estimated to be about one electron/pulse. Beam commissioning has been carried out. The key technologies for achieving such low intensity electron beams are to control the beam using 8 movable slits and to measure the intensity of the beam using 9 movable current monitors based on scintillator. In this paper, principal of operation, instrumentation and programming of the movable slits and movable current monitors are discussed. Some results of beam commissioning are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB074

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB094

A Fast Beam Size Diagnostic System Using High-Speed Photomultiplier Array at SSRF

diagnostics, pick-up, storage-ring, synchrotron

345

H.J. Chen, N. Zhang
SSRF, Shanghai, People's Republic of China
J. Chen, B. Gao, L.W. Lai, Y.B. Leng
SINAP, Shanghai, People's Republic of China

A fast beam size diagnostic system is developing at SSRF (Shanghai Synchrotron Radiation Facility) storage ring for turn-by-turn and bunch-by-bunch beam trans-verse oscillation study and fast transverse feedback sys-tem improvement. The system is based on visible synchrotron radiation diagnostic, detected by a Hamamatsu H10515B 16-channel photomultiplier array with 0.6ns rise time. A telescope imaging system is also developing for optical front-end process, with simulation optical path calibra-tion and high-resolution CCD camera reference. A fast pick-up board and amplifiers are designed for analogue signal optimization. The data acquisition and analyse solution is Tektronix oscilloscope with 6GHz analogue bandwidth and 25GS/s sampling rate or four synchronized ADQ14 digitizers with 700MHz analogue bandwidth and 1GS/s sampling rate. By now, we have finished the detector selection, sys-tem setup, data acquisition design and system response testing. The telescope imaging testing and 16-channels data acquisition based on synchronized ADQ14s are under development. A new photomultiplier array with less response time is in plan for strictly bunch-by-bunch diagnostic.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB094

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB110

Comparison of Transverse Emittance Measurements in the LHC

emittance, luminosity, experiment, operation

377

M. Hostettler, R. Alemany-Fernández, F. Alessio, M. Ferro-Luzzi, K. Fuchsberger, G. Iadarola, R. Matev, S. Papadopoulou, Y. Papaphilippou, G. Papotti, G. Trad
CERN, Geneva, Switzerland
F. Antoniou
The University of Liverpool, Liverpool, United Kingdom
G.R. Coombs
University of Glasgow, Glasgow, United Kingdom
T.B. Hadavizadeh
Oxford University, Physics Department, Oxford, Oxon, United Kingdom

Transverse emittance measurement in a collider is of crucial importance for understanding beam dynamics observations and evaluating the machine performance. Devices measuring the beam emittance face the challenge of dealing with considerable systematic errors that can compromise the quality of the measurement. Having different instruments or techniques that provide beam size estimations in order to compare the outcome and give an unbiased value of the emittance is very important in a collider. The comparison of the different results is as well very useful to identify possible problems in a given equipment which could remain unnoticed if such device is the only source of emittance reconstruction. In the LHC several of these instruments and techniques are available; wire scanners, synchrotron light monitors, emittance reconstruction from transverse convolved beam sizes extracted from luminosity scans at the LHC collision points and from beam-gas imaging in the vertex detector of the LHCb experiment. Those systems are briefly presented in this paper together with the comparison of the emittances reconstructed by each of them during physics production over the 2016 LHC run.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB110

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB121

Installation and Test of Pre-series Wire Scanners for the LHC Injector Upgrade Project at CERN

vacuum, controls, laser, electronics

412

R. Veness, P. Andersson, W. Andreazza, N. Chritin, B. Dehning, J. Emery, A. Goldblatt, D. Gudkov, F. Roncarolo, J.L. Sirvent, J. Tassan-Viol
CERN, Geneva, Switzerland

A new generation of fast wire scanners is being developed for the LHC Injectors Upgrade (LIU) project at CERN. These will be essential tools for transverse profile measurement with the higher brightness LIU beams, and are planned for installation in 2019 in all three synchrotrons making up the LHC injector chain. An active period of development and test has resulted in prototype installations in the SPS and PSB rings. This paper will summarise the design and report on the results to-date.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB121

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB128

The Design of a Non-Destructive Single-Shot Longitudinal Bunch Profile Monitor using Smith-Purcell Radiation

radiation, background, polarization, experiment

433

H. Harrison, G. Doucas, I.V. Konoplev, A.J. Lancaster, H. Zhang
JAI, Oxford, United Kingdom
A. Aryshev, M. Shevelev, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan

Funding: This work was supported by the: the STFC UK, the Leverhulme Trust, the JAI (University of Oxford) and the Photon and Quantum Basic Research Coordinated Development (Japan).
The conceptual design for a single-shot longitudinal bunch profile monitor using coherent Smith-Purcell radiation (cSPr) has recently been completed. The exploitation of the directionality and the polarization of cSPr to reduce the length of the monitor and to eliminate background radiation are discussed. The linear polarization of cSPr will be used to separate the signal from background radiation and experiments to test this design will be presented. Alongside the conceptual design an investigation to optimize the number of detection channels needed to produce high quality longitudinal bunch profile reconstructions has been carried out. It has been determined that the number of detection channels can be reduced compared to previous experiments if measurement uncertainty and background radiation are minimized effectively.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB128

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB131

Transverse Emittance Measurements Using LHCb's Beam-Gas Interactions

emittance, real-time, experiment, operation

441

T.B. Hadavizadeh
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
R. Alemany-Fernández, F. Alessio, C. Barschel, G.R. Coombs, M. Ferro-Luzzi, R. Matev
CERN, Geneva, Switzerland

Measurements of the transverse beam emittance are of great importance at particle accelerators such as the LHC in order to monitor, understand and improve the performance of the machine. A number of profile monitors at the LHC are capable of measuring the transverse emittance from a range of different processes including wire scanners and beam synchrotron light monitors, each having advantages and shortcomings. It is possible additionally to measure the beam profiles using interaction vertices reconstructed in LHCb's vertex locator (Velo). Interactions between colliding beam particles and between beam particles and residual gas nuclei are used to build up a picture of the beam profiles. To guarantee the reliability and quality of the different emittance measurements, a dedicated cross-calibration was performed during a machine development period in October 2016. The results obtained with the LHCb Velo during this cross-calibration are presented here.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB131

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPAB144

Residual-Gas Beam Profile Monitors for Intense Beams in Transfer Lines

electron, ion, proton, synchrotron

469

R.J. Abrams, M.A. Cummings, V.G. Dudnikov, R.P. Johnson
Muons, Inc, Illinois, USA
M. Popovic
Fermilab, Batavia, Illinois, USA

Muons, Inc. proposes to develop a Residual-Gas Beam Profile Monitor for Transfer Lines with pulse-to-pulse precision of better than 0.1 mm in position and size that will operate over a wide range of proton beam intensities including those needed for multi-MW beams of future facilities. Traditional solid-based beam intercepting instrumentation produces unallowable levels of radiation at high powers. Our alternative approach is to use a low mass residual-gas profile monitor, where ionization electrons are collected along extended magnetic field lines and the gas composition and pressure in the beam pipe are locally controlled to minimize unwanted radiation and to improve resolution. Beam Induced Fluorescence profile monitor with mirascope light collection is proposed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB144

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPIK048

Experimental Results of Crystal-Assisted Slow Extraction at the SPS

extraction, proton, experiment, collimation

623

M.A. Fraser, S.S. Gilardoni, B. Goddard, V. Kain, D. Mirarchi, S. Montesano, S. Petrucci, S. Redaelli, R. Rossi, W. Scandale, L.S. Stoel, F.M. Velotti
CERN, Geneva, Switzerland
F.M. Addesa, G. Cavoto, F. Iacoangeli
INFN-Roma, Roma, Italy
F. Galluccio
INFN-Napoli, Napoli, Italy
F. Murtas
INFN/LNF, Frascati (Roma), Italy

The possibility of extracting highly energetic particles from the Super Proton Synchrotron (SPS) by means of silicon bent crystals has been explored since the 1990's. The channelling effect of a bent crystal can be used to strongly deflect primary protons and eject them from the synchrotron. Many studies and experiments have been carried out to investigate crystal channelling effects. The extraction of 120 and 270 GeV proton beams has already been demonstrated in the SPS with dedicated experiments located in the ring. Presently in the SPS, the UA9 experiment is performing studies to evaluate the possibility to use bent silicon crystals to steer particle beams in high energy accelerators. Recent studies on the feasibility of extraction from the SPS have been made using the UA9 infrastructure with a longer-term view of using crystals to help mitigate slow extraction induced activation of the SPS. In this paper, the possibility to eject particles into the extraction channel in LSS2 using the bent crystals already installed in the SPS is presented. Details of the concept, simulations and measurements carried out with beam are presented, before the outlook for the future is discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPIK067

Figure-8 Storage Ring - Ion Beam Injection into a Closed, Magnetic System

injection, experiment, storage-ring, ion

680

H. Niebuhr, A. Ates, M. Droba, O. Meusel, U. Ratzinger
IAP, Frankfurt am Main, Germany

To store high current low-energetic ion beams of up to 10 A, a superconducting storage ring (F8SR) based on solenoidal and toroidal magnetic guiding fields is investigated at Frankfurt University. Besides simulations, a scaled down experimental setup with normalconducting magnets was built. Investigations of beam injection into closed, magnetic guiding fields are in progress. Therefore, a new kind of injection system consisting of a solenoidal injection coil and a special vacuum vessel was constructed. It is used to inject a hydrogen beam from the side between two toroidal magnets. In parallel operation, a second hydrogen beam is transported through both magnets to represent the circulating beam. The current status of the experimental setup and first experimental results will be shown.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK067

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPVA017

Electrostatic Pickup in the CNAO Injection Line

ion, linac, pick-up, proton

884

A. Parravicini, G.M.A. Calvi, E. Rojatti, C. Viviani
CNAO Foundation, Pavia, Italy

The paper concerns the electrostatic pickup (PUB) installed in the injection line of the CNAO, the Italian facility for Oncological Hadrontherapy. The PUB has been designed with the purpose of having a continuous and non-interceptive measurement of the beam transverse position short upstream the injection in the synchrotron. Detector commissioning has not been immediate since a number of primary ions and secondary electrons fall on the PUB electrodes in many configurations, resulting in a significantly distorted signal. After the identification, and consequent rejection, of a few circumstances where the PUB cannot work properly, the commissioning proceeded on a twofold way, designing a mechanical shield to stop ions before hitting the electrodes and developing an advanced data-analysis algorithm to go beyond the signal distortion. The use of the new algorithm was sufficient to make the PUB successfully working and, after a proper calibration with upstream and downstream profile monitors, the PUB started to provide the expected results. The PUB is working as a watch-dog since January 2016. Details on the data-analysis algorithm and first year measurements are discussed in the paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA017

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPVA047

Investigation of Trapped Magnetic Flux in Superconducting Niobium Samples with Polarized Neutron Radiography

neutron, niobium, experiment, polarization

964

O. Kugeler, J. Knobloch, M.M. Krzyzagorski, J.M. Köszegi, L. Riik, W. Treimer, R.F. Ziesche
HZB, Berlin, Germany

The dynamics of flux expulsion during superconducting transition and the influence of external AC magnetic fields on expulsion of trapped fields in Nb samples has been investigated with radiography using polarized neu-trons. Results of these experiments are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA047

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPVA061

Quench and Field Emission Diagnostics for the ESS Medium-Beta Prototypes Vertical Tests at LASA

cavity, radiation, electron, diagnostics

1007

M. Bertucci, A. Bellandi, A. Bignami, A. Bosotti, J.F. Chen, P. Michelato, L. Monaco, R. Paparella, D. Sertore
INFN/LASA, Segrate (MI), Italy
C. Pagani
Università degli Studi di Milano & INFN, Segrate, Italy
S. Pirani
ESS, Lund, Sweden

In order to investigate the possible causes of premature thermal breakdown and performance degradation, several diagnostic techniques have been employed during the vertical tests of the Fine and Large Grain ESS Medium Beta prototypes cavities. The whole equipment, which includes second sound, fast thermometry, photodiode x ray detectors and an external NaI scintillator, is here described and the results so far obtained during the vertical tests presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA061

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOAB1

First LHC Transverse Beam Size Measurements With the Beam Gas Vertex Detector

target, hardware, vacuum, data-acquisition

1240

A. Alexopoulos, C. Barschel, E. Bravin, G. Bregliozzi, N. Chritin, B. Dehning, M. Ferro-Luzzi, M. Giovannozzi, R. Jacobsson, L.K. Jensen, O.R. Jones, V. Kain, R. Matev, M.N. Rihl, V. Salustino Guimaraes, R. Veness, S. Vlachos, B. Würkner
CERN, Geneva, Switzerland
A. Bay, F. Blanc, S. Gianì, O. Girard, G.J. Haefeli, P. Hopchev, A. Kuonen, T. Nakada, O. Schneider, M. Tobin, Q.D. Veyrat, Z. Xu
EPFL, Lausanne, Switzerland
R. Greim, W. Karpinski, T. Kirn, S. Schael, A. Schultz von Dratzig, G. Schwering, M. Wlochal
RWTH, Aachen, Germany

The Beam Gas Vertex detector (BGV) is an innovative beam profile monitor based on the reconstruction of beam-gas interaction vertices which is being developed as part of the High Luminosity LHC project. Tracks are identified using several planes of scintillating fibres, located outside the beam vacuum chamber and perpendicular to the beam axis. The gas pressure in the interaction volume is adjusted such as to provide an adequate trigger rate, without disturbing the beam. A BGV demonstrator monitoring one of the two LHC beams was fully installed and commissioned in 2016. First data and beam size measurements show that the complete detector and data acquisition system is operating as expected. The BGV operating parameters are now being optimised and the reconstruction algorithms developed to produce accurate and fast reconstruction on a CPU farm in order to provide real time beam profile measurements to the LHC operators.

Slides TUOAB1 [3.456 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOAB1

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOAB3

Development of Wide Dynamic Range Beam Loss Monitor System for the J-PARC Main Ring

operation, beam-losses, injection, extraction

1248

K. Satou, N. Kamikubota, T. Toyama, S. Yamada
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
S.Y. Yoshida
Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan

The new beam loss monitor (BLM) system now in operation at the main ring of J-PARC consists of an isolated front-end current to voltage converter, a VME-based 24 bit ADC system. A dual detector system employs a proportional-type gas chamber (PBLM) and an air-filled ionization chamber (AIC). The system shows a wide dynamic range of 160 dB. It can detect the low level signal that would arise in the case of the detection of residual dose in the ring itself after the beam has been turned off as well as an event such as high level beam loss at the collimators. The signal rise time of the waveform obtained is 17 us which fast enough to meet the speed requirement of the Machine Protection System (MPS); which is that the MPS should dump the beam within 100 us when the beam loss signal exceeds the reference levels set in the ADC system.

Slides TUOAB3 [2.692 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUOAB3

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB018

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

electron, quadrupole, 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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB018

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB071

Experimental Results on THz Superradiation From the Undulator in Tsinghua University Beamline

radiation, undulator, electron, experiment

1488

X.L. Su, Y.-C. Du, W.-H. Huang, L. Niu, C.-X. Tang, Q.L. Tian, D. Wang, L.X. Yan
TUB, Beijing, People's Republic of China
Y.F. Liang
Tsinghua University, Beijing, People's Republic of China

In this paper, the first operation of a widely tunable 8-period undulator at terahertz (THz) frequency in Tsinghua University beamline was reported. Superradiate undulator radiation from sub-picosecond electron bunches compressed by chicane was observed. The measured radiation curve shows clearly that the radiation energy is proportional to the charge square, and the THz frequency can be changed from 0.4 THz to 10 THz with narrow-band spectrums. Our results demonstrate a high power and tunable coherent THz source, which could be useful for many applications in the future.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB071

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB111

Energy Distribution and Work Function Measurements for Metal Photocathodes with Measured Levels of Surface Roughness

emittance, electron, FEL, plasma

1580

L.B. Jones, T.S. Beaver, B.L. Militsyn, T.C.Q. Noakes, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
S. Mistry
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
S. Mistry
Loughborough University, Leicestershre, United Kingdom

Funding: The work is part of EuCARD-2, partly funded by the European Commission, GA 312453.
The minimum achievable emittance in an electron accelerator depends strongly on the intrinsic emittance of the photocathode electron source which is measureable as the mean longitudinal and transverse energy spreads in the photoemitted electrons. Reducing emittance in an accelerator driving a Free Electron Laser (FEL) delivers significant reduction in the saturation length for an x-ray FEL, reducing machine cost and increasing x-ray beam brightness. There are many parameters which affect the intrinsic emittance of a photocathode. Surface roughness is a significant factor*, and consequently the development of techniques to manufacture low roughness photocathodes with optimum emission properties is a priority for the electron source community. In this work, we present transverse energy distribution and work function measurements made using our TESS facility** for electrons emitted from copper and molybdenum photocathodes with differing levels of measured surface roughness.
* Proc. FEL '06, THPPH013, 583-586
** Proc. FEL '13, TUPPS033, 290-293

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB111

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK086

Modelling the Radioactivity Induced by Slow-Extraction Losses in the CERN SPS

extraction, proton, operation, radioactivity

1897

M.A. Fraser, D. Björkman, K. Cornelis, B. Goddard, V. Kain, P.M. Schicho, C. Theis, H. Vincke
CERN, Geneva, Switzerland

Resonant slow extraction is used to provide an intense quasi-DC flux of high-energy protons for the Fixed Target (FT) physics programme at the CERN Super Proton Synchrotron (SPS). The unavoidable beam loss intrinsic to the extraction process activates the extraction region and its equipment. Although the radiation dose to equipment has an impact on availability, the cool-down times required to limit dose to the personnel carrying-out maintenance of the accelerator also pose important restrictions, and ultimately limit the number of protons on target. In order to understand how the extracted proton flux affects the build-up and subsequent cool-down of the induced activation, a model based on a simple empirical relationship has been developed and shown to predict the measured radioactive decay at ionisation chambers located along the extraction region. In this contribution, the empirical model is described, its strengths and limitations discussed, and its application as a predictive tool for estimating cool-down times as a function of extracted proton flux demonstrated.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK086

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPIK089

Studies on Luminous Region, Pile-up and Performance for HL-LHC Scenarios

luminosity, operation, simulation, optics

1908

L.E. Medina Medrano, G. Arduini, R. Tomás
CERN, Geneva, Switzerland
L.E. Medina Medrano
UGTO, Leon, Mexico

Funding: Research supported by the HL-LHC project and the Beam project (CONACYT, Mexico).
Studies on luminous region and pile-up density are of great interest for the experiments at the future High Luminosity LHC (HL-LHC) in order to optimize the detector performance. The evolution of these parameters at the two main interaction points of the HL-LHC along optimum physics fills is studied for the baseline and alternative operational scenarios with the latest set of parameters, including a refined description of the longitudinal bunch profile. Results are discussed in terms of a new figure-of-merit, the effective pile-up density.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK089

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA032

Beam-Gas Background Observations at LHC

background, experiment, simulation, luminosity

2129

S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom
R. Alemany-Fernández, F. Alessio, G. Bregliozzi, H. Burkhardt, G. Corti, A. Di Mauro, M. Guthoff, A. Manousos, K.N. Sjobak, C. Yin Vallgren
CERN, Geneva, Switzerland
A. Alici
Bologna University, Bologna, Italy
S. D'Auria
University of Glasgow, Glasgow, United Kingdom
S.M. Gibson
JAI, Egham, Surrey, United Kingdom
D. Lazic
BUphy, Boston, Massachusetts, USA

Observations of beam-induced background at LHC during 2015 and 2016 are presented in this paper. The four LHC experiments use the non-colliding bunches present in the physics-filling pattern of the accelerator to trigger on beam-gas interactions. During luminosity production the LHC experiments record the beam-gas interactions using dedicated background monitors. These data are sent to the LHC control system and are used to monitor the background levels at the experiments during accelerator operation. This is a very important measurement, since poor beam-induced background conditions can seriously affect the performance of the detectors. A summary of the evolution of the background levels during 2015 and 2016 is given in these proceedings.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA032

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA036

Cross-Talk Studies between FCC-hh Experimental Interaction Regions

proton, collider, simulation, interaction-region

2136

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

Funding: The European Circular Energy-Frontier Collider Study (EuroCirCol), EU's Horizon 2020 grant No 654305.
Debris from 50 TeV proton-proton collisions at the main interaction point in the FCC-hh may contribute to the background in the subsequent detector. This cross-talk is of possible concern for the FCC-hh due to the high luminosity and energy of the collider. DPMJET-III is used as a collision debris generator in order to assess the muon cross-talk contribution. An analytical calculation of muon range in rock is performed. This is followed by a full Monte Carlo simulation using FLUKA, where the accelerator tunnel has been modelled. The muon cross talk between the adjacent interaction points is assessed and its implications for FCC-hh design are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA036

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA040

Overview of Design Development of FCC-hh Experimental Interaction Regions

luminosity, optics, dipole, experiment

2151

A. Seryi, J.L. Abelleira, E. Cruz Alaniz, L.J. Nevay, L. van Riesen-Haupt
JAI, Oxford, United Kingdom
R.B. Appleby, H. Rafique
UMAN, Manchester, United Kingdom
R.B. Appleby
Cockcroft Institute, Warrington, Cheshire, United Kingdom
J. Barranco García, T. Pieloni
EPFL, Lausanne, Switzerland
M. Benedikt, M.I. Besana, X. Buffat, H. Burkhardt, F. Cerutti, A. Langner, R. Martin, W. Riegler, D. Schulte, R. Tomás
CERN, Geneva, Switzerland
M. Boscolo, F. Collamati
INFN/LNF, Frascati (Roma), Italy
M. Hofer
TU Vienna, Wien, Austria
L.J. Nevay
Royal Holloway, University of London, Surrey, United Kingdom
L. van Riesen-Haupt
University of Oxford, Oxford, United Kingdom

The experimental interaction region is one of the key areas that define the performance of the Future Circular Collider. In this overview we will describe the status and the evolution of the design of EIR of FCC-hh, focusing on design of the optics, energy deposition in EIR elements, beam-beam effects and machine detector interface issues.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA040

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA048

Calculation of Particle Loss Maps for 2016 RHIC Gold-Gold Run

simulation, operation, kicker, radiation

2181

Y. Luo, K.A. Drees, W. Fischer, X. Gu, A. Marusic, G. Robert-Demolaize, V. Schoefer
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.
In the 2016 RHIC 100~GeV gold-gold (Au-Au) run, 20~mm orbit bumps were installed in the arcs to protect the experimental detectors from abort kicker prefiring. Chronic particle losses were observed in the arcs with these orbit bumps. Those particle losses are mainly from the 78+Au197 and 79+Au196 particles generated from bound-free pair production (BFPP) and electromagnetic dissociation (EMD) associated with the Au-Au collision at the IPs. In this article, we present simulated particle losses of 78+Au197 and 79+Au196 and calculate the particle loss distribution in the ring. The calculated particle loss maps are compared with operational observations.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA079

Model of Statistical Errors in the Search for the Deuteron EDM in the Storage Ring

simulation, experiment, scattering, dipole

2258

A.E. Aksentyev, V. Senichev
FZJ, Jülich, Germany

In this work we investigate the standard error of the spin precession frequency estimate in an experiment for the search for the electric dipole moment (EDM) of the deuteron using the polarimeter. The basic principle of polarimetry is the scattering of a polarized beam on a carbon target. Since the number of particles in one fill is limited, we must maximize the utility of the beam. This raises the question of sampling efficiency, as the signal, being an oscillating function, varies in informational content. To address it, we define a numerical measurement model, and compare two sampling strategies (uniform and frequency-modulated) in terms of beam-use efficiency. The upshot is the formulation of the conditions necessary for the effective use of the modulated sampling strategy, and the evaluation of its advantage over the uniform strategy. The simulation results are also used to compare two competing analytical models for the standard error of the frequency estimate.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA079

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA096

Detection of H⁰ Particles in MEBT2 Chicane of J-PARC Linac

vacuum, linac, ion, diagnostics

2308

J. Tamura, H. Ao, T. Maruta, A. Miura, T. Morishita, K. Okabe, M. Yoshimoto
JAEA/J-PARC, Tokai-mura, Japan
K. Futatsukawa, T. Miyao
KEK, Ibaraki, Japan
Y. Nemoto
Nippon Advanced Technology Co., Ltd., Tokai, Japan

In the Japan Proton Accelerator Research Complex (J-PARC), H⁰ particles generated by collisions of accelerated H⁻ beams with residual gases are considered as one of the key factors of the residual radiation in the high energy accelerating section of the linac. To diagnose the H⁰ particles, the new beam line for analyzing H⁰ and H⁻ particles was installed in the second medium energy beam transport (MEBT2), which is the matching section from the separated-type drift tube linac (SDTL) to the annular-ring coupled structure linac (ACS). The analysis line consists of four dipole magnets for giving the H⁻ beam chicane orbit, and a wire scanner monitor (WSM) for measuring the horizontal shift of the H⁻ beam. To detect the H⁰ particles, a carbon plate is installed to the WSM. In the beam commissioning, we detected the signals of H⁰ particles penetrating the plate and observed the transition of the signal with various vacuum condition in the SDTL section.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA096

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA123

Status of DESIREE

ion, injection, storage-ring, experiment

2379

A. Simonsson, M. Björkhage, M. Blom, H. Cederquist, K. Chartkunchand, G. Eklund, A. Källberg, P. Löfgren, H. Motzkau, P. Reinhed, S. Rosén, H.T. Schmidt
Stockholm University, Stockholm, Sweden

DESIREE, the double electrostatic storage rings in Stockholm has been running since 2011(?). In the cold (13 K) environment with an excellent vacuum, very long storage times in both rings have been achieved, which has enabled the preparation of beams in a single quantum state. The status of DESIREE is presented with particular emphasis on measurements of stored beam currents in the sub-nA range. We also discuss the ongoing work towards stochastic cooling of very slow beams.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA123

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPVA124

The Beam Lines Design for the CERN Neutrino Platform in the CERN North Area and an Outlook on Their Expected Performance

experiment, target, instrumentation, proton

2382

N.C. Charitonidis, M. Brugger, I. Efthymiopoulos, L. Gatignon, E.M. Nowak, I. Ortega Ruiz
CERN, Geneva, Switzerland
Y. Karyotakis
IN2P3-LAPP, Annecy-le-Vieux, France
P.R. Sala
Istituto Nazionale di Fisica Nucleare, Milano, Italy

In the framework of the CERN Neutrino Platform project, extensions to the existing SPS North Area H2 and H4 secondary beam lines, able to provide low-energy charged particles in the momentum range of 0.4 to 12 GeV, have been designed. The parameters of these very low energy beam lines, the expected beam composition as seen by the experiments as well as an outlook on their expected performance are summarized in this paper. Results from Monte-Carlo simulations, important for the optimization of the future instrumentation of the beam lines (serving both the purpose of beam tuning and the experiments' needs for particle identification and momentum measurements), are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA124

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB129

Study of Ionization Cooling with the MICE Experiment

emittance, solenoid, experiment, optics

2874

C.T. Rogers
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom

The international Muon Ionization Cooling Experiment (MICE) will demonstrate the ionization cooling of muons; the only known technique that can provide high brightness muon beams suitable for applications such as a Neutrino Factory or Muon Collider. MICE is underway at the Rutherford Appleton Laboratory and has recently taken the data necessary to characterise the physical processes that underlie the ionization-cooling effect. Measurements of the change in normalised transverse amplitude are presented in two configurations. The measurements of the ionization-cooling effect are discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB129

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB130

First Results from MICE Step IV

emittance, scattering, simulation, solenoid

2878

P. Franchini
University of Warwick, Coventry, United Kingdom

Funding: STFC, DOE, NSF, INFN, CHIPP and more
Muon beams of low emittance provide the basis for the intense, well characterised neutrino beams of the Neutrino Factory and for lepton-antilepton collisions at energies of up to several TeV at a Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate ionization cooling - the technique by which it is proposed to reduce the phase-space volume occupied by the muon beam. MICE is being constructed in a series of Steps. The configuration currently in operation at the Rutherford Appleton Laboratory is optimised for the study the properties of liquid hydrogen and lithium hydride that affect cooling. The data taken in the present configuration have been partially analyzed and the available results will be described in detail.
submitted by the Speakers Bureau of the collaboration, in charge of
finding later a member to prepare and present the contribution

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB130

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPAB131

Layout of the MICE Demonstration of Muon Ionization Cooling

emittance, betatron, lattice, solenoid

2881

C. Hunt, J.-B. Lagrange, J. Pasternak
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

Funding: STFC, DOE, NSF, INFN, CHIPP and more
Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams necessary to elucidate the physics of flavour at the Neutrino Factory and to provide lepton-antilepton collisions up to several TeV at the Muon Collider. The international Muon Ionization Cooling Experiment (MICE) will demonstrate muon ionization cooling, the technique proposed to reduce the phase-space volume occupied by the muon beam at such facilities. In an ionization-cooling channel, the muon beam traverses a material (the absorber) loosing energy, which is replaced using RF cavities. The combined effect is to reduce the transverse emittance of the beam (transverse cooling). The configuration of MICE required to deliver the demonstration of ionization cooling is presently being prepared in parallel to the execution of a programme designed to measure the cooling properties of liquid-hydrogen and lithium hydride (Step IV). The design of this final cooling demonstration will be presented together with a summary of the performance of each of its components and the cooling performance of the experiment.
submitted by the Speakers Bureau of the collaboration, in charge of
finding later a member to prepare and present the contribution

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB131

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK004

Luminosity- and Beam- Induced Backgrounds for the FCC-ee Interaction Region Design

background, photon, luminosity, interaction-region

2914

G.G. Voutsinas, P. Janot, A.M. Kolano, E. Perez, N.A. Tehrani
CERN, Geneva, Switzerland
N. Bacchetta
INFN- Sez. di Padova, Padova, Italy
M. Boscolo
INFN/LNF, Frascati (Roma), Italy
M.K. Sullivan
SLAC, Menlo Park, California, USA

A preliminary study on machine induced backgrounds has been performed for the proposed FCC-ee interaction region (IR) and proto-detector. Synchrotron radiation has the strongest impact on the present design of the IR and both radiation from dipoles and quadrupoles have been taken into account. The effect of luminosity backgrounds like gamma gamma to hadrons and pair production have also been studied. The impact of background particles on the detector occupancy has also been studied in full simulation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK004

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK016

CEPC-SppC Towards CDR

collider, luminosity, booster, positron

2954

J. Gao
IHEP, Beijing, People's Republic of China

Funding: supported by National Key Programme for S&T Research and Development (2016YFA0400400), National Natural Science Foundation of China (11575218, 11605211, 11605210, 11505198), Key Research Program of Frontier Sciences, CAS, (QYZDJ-SSW-SLH004) and CAS Center for Excellence in Particle Physics (CCEPP)
In this paper we will give an introduction to Circular Electron Positron Collider (CEPC). The scientific background, physics goal, the collider design requirements and the conceptual design principle of CEPC are described. On CEPC accelerator, the optimization of parameter designs for CEPC with different energies, machine lengthes, single ring and crab-waist collision partial double ring, advanced partial double partial ring and fully partial double ring options, etc. have been discussed systematically, and compared. CEPC accelerator baseline and alternative designs have been proposed based on the luminosity potential in relation with the design goals. The sub-systems of CEPC, such as collider main ring, booster, electron positron injector, etc. ave also been introduced. The detector and MDI design have been briefly mentioned. Finally, the optimization design of Super Proton-Proton Collider (SppC), its energy and luminosity potentials, in the same tunnel of CEPC are also discussed. The CEPC-SppC Progress Report (2015-2016) has been published.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK016

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK021

MDI Issues in CEPC Double Ring

quadrupole, radiation, 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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK021

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK029

High Luminosity at VEPP-2000 Collider With New Injector

luminosity, collider, injection, positron

2989

P.Yu. Shatunov, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov
BINP SB RAS, Novosibirsk, Russia
E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, D.B. Shwartz
NSU, Novosibirsk, Russia

VEPP-2000 e⁺e⁻ collider at BINP was commissioned and started data taking with two detectors in 2010 with old injection chain. In the middle energy range, where the luminosity was limited by beam-beam effects, the world record values of beam-beam parameter were achieved, ksi=0.12/IP. At the same time the design luminosity value of L = 10³² cm^-2s⁻¹ at top energy (E = 1 GeV per beam) remained unreachable due to limited e⁺ production rate. The injection chain was significantly upgraded in 2013-2016. The experience of upgraded VEPP-2000 complex operation at top energies with Round Colliding Beams will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK029

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK034

Progress in the FCC-ee Interaction Region Magnet Design

solenoid, quadrupole, 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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK034

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK048

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

electron, radiation, photon, quadrupole

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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK095

Evaluation of Longitudinal Beam Impedance in the Beam Gas Ionization Monitor of the CERN-PS Accelerator

impedance, coupling, simulation, wakefield

3163

N. Nasr Esfahani, T. Kaltenbacher, J.W. Storey, C. Vollinger
CERN, Geneva, Switzerland

The recently observed beam induced heating issues in the BGI monitors of the LHC which could have been occurred due to a strong coupling between the beam and the localized modes at the sensor location showed the general importance of a thorough evaluation of the beam coupling impedance and the corresponding heat deposit in beam monitoring equipments. This paper is devoted to the examination of the beam coupling impedance and beam induced heating for a currently under development beam gas ionization (BGI) monitor which is intended to be a part of the CERN Proton Synchrotron (PS) beam monitoring equipment. Details of the EM and wake field simulations for this BGI monitor together with the RF measurement results and power loss calculations will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK095

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA048

Particle Generation of CapaciTorr Pumps

vacuum, operation, SRF, synchrotron

3363

S. Lederer, L. Lilje
DESY, Hamburg, Germany
E. Maccallini, P. Manini, F. Siviero
SAES Getters S.p.A., Lainate, Italy

Non Evaporable Getter pumps have been used since four decades in various scientific and industrial Ultra High and Extremely Ultra High Vacuum applications. For the majority of applications properties like high pumping speed vs. small size, powerless operation and hydrocarbon cleanliness are main aspects for the usage. In addition to this a growing number of applications nowadays also require particle free systems. In this paper we report on investigations on in-vacuum particle creation during the conditioning and activation process of CapaciTorr pumps.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA048

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA129

Arc-Flash Hazard and Protection for Electric Switchboard at NSRRC

site, photon, power-supply, impedance

3571

T.-S. Ueng, Y.F. Chiu, C.K. Kuan, K.C. Kuo, Y.-C. Lin
NSRRC, Hsinchu, Taiwan

During the operation of electrical equipment the arc-flash accident could damage the equipment and endanger the working personnel. In order to prevent this type of accidents from happening and to minimize the damages, a delicate setup is being installed inside the electric switchboard for suppressing the accidents at the initial stage of arcing at NSRRC's power system. The installed device includes the arc sensor, the smoke detector, the high rupturing capacity fuse, the circuit breaker and the protection relay. Further improvement on preventing the arc-flash accidents is also under study.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA129

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPVA147

Iron-Free Detector System for the Linear Collider with Multiple Return Solenoids

solenoid, collider, linear-collider, emittance

3615

A.A. Mikhailichenko
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

We investigate the Iron-free magnetic system for implementation in a detector for future Linear Collider. One peculiarity is in usage of many small-diameter solenoids for the flux return. Machine-detector interface is discussed also.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA147

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB084

Integration of the Full-Acceptance Detector Into the JLEIC

dynamic-aperture, ion, collider, solenoid

3912

G.H. Wei, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
JLab, Newport News, Virginia, USA
Y.M. Nosochkov
SLAC, Menlo Park, California, USA
M.-H. Wang
Self Employment, Private address, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported also by the U.S. DOE Contract DE-AC02-76SF00515.
For physics requirements, the JLEIC (Jefferson Lab Electron Ion Collider) has a full-acceptance detector, which brings many new challenges to the beam dynamics integration. For example, asymmetric lattice and beam envelopes at interaction region (IR), forward detection, and large crossing angle with crab dynamics. Also some common problems complicate the picture, like coupling and coherent orbit from detector solenoid, high chromaticity and high multipole sensitivity from low beta-star at interaction point (IP), collision mode with different energy and ion species. Meanwhile, to get a luminosity level of a few 10³³ cm^-2ses⁻¹, small beta-star are necessary at the IP, which also means large beta in the final focus area, chromaticity correction sections, etc. This sets a constraint on the field quality of magnets in large beta areas, in order to ensure a large enough dynamic aperture (DA). In this context, limiting multipole components of magnets are surveyed to get a standard line. And continuously, multipole magnets as dedicated correctors are studied to provide semi-local corrections of specific multipole components beyond the standard line.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB084

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB105

Design and Operation of the Integrated 1.3 GHz Optical Reference Module with Femtosecond Precision

laser, controls, operation, FEL

3963

T. Lamb, L. Butkowski, E.P. Felber, M. Felber, M. Fenner, S. Jabłoński, T. Kozak, J.M. Müller, P. Prędki, H. Schlarb, C. Sydlo, M. Titberidze, F. Zummack
DESY, Hamburg, Germany

In modern Free-Electron Lasers like FLASH or the European XFEL, the short and long-term stability of RF reference signals gains in importance. The requirements are driven by the demand for short FEL pulses and low-jitter FEL operation. In previous publications, a novel, integrated Mach-Zehnder Interferometer based scheme for a phase detector between the optical and the electrical domain was presented and evaluated. This Laser-to-RF phase detector is the key component of the integrated 1.3 GHz Optical Reference Module (REFM-OPT) for FLASH and the European XFEL. The REFM-OPT will phase-stabilize 1.3 GHz RF reference signals to the pulsed optical synchronization systems in these accelerators. Design choices in the final hardware configuration are presented together with measurement results and a performance evaluation from the first operation period in the European XFEL.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB105

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB109

Fs Level Laser-to-RF Synchronization at REGAE

laser, timing, electron, electronics

3972

M. Titberidze, M. Felber, T. Lamb, H. Schlarb, C. Sydlo
DESY, Hamburg, Germany
R.A. Loch
MPSD, Hamburg, Germany

The Relativistic Electron Gun for Atomic Exploration (REGAE) is a unique linear accelerator capable of producing ultrashort (~ 10 fs) electron bunches for studying fast processes in matter by means of ultrafast electron diffraction (UED) experiments. Additionally, REGAE is suitable for upcoming external injection experiments for laser wakefield acceleration (LWFA). In order to carry out both mentioned experiments, it is crucial to achieve fs level stability in terms of Laser-to-RF synchronization. In this paper we present an advanced laser-to-RF synchronization scheme based on integrated Mach-Zehnder modulator. The setup demonstrated the Titanium Sapphire photo-injector laser synchronization with 11 fs (rms) precision in the bandwidth up to 100 kHz. Long term timing drift measurements showed unprecedented peak-to-peak stability of 31 fs (7 fs rms) over 43 hours of measurement time. In addition, AM-PM coefficient of the MZM based laser-to-RF synchronization setup has been evaluated and showed a factor of 10 improved performance compared to conventional direct conversion based laser synchronization setup.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB109

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB119

Study on a Time-Domain Spectroscopy System for Coherent Terahertz Pulse Spectrum Measurement from 5 MeV Electron Beam

laser, radiation, electron, polarization

4003

R. Yanagisawa, T. Toida
Waseda University, Tokyo, Japan
K. Kan
ISIR, Osaka, Japan
K. Sakaue
Waseda University, Waseda Institute for Advanced Study, Tokyo, Japan
M. Washio
RISE, Tokyo, Japan

Funding: This work was supported by a research granted from The Murata Science Foundation and JSPS KAKENHI 26286083.
Terahertz wave, expected to apply spectral analysis and imaging, has recently developed both source and detector components. For the terahertz source, the coherent radiation from electron linac is expected to be the high power terahertz source. At Waseda University, we have been studying high quality electron beam generation using Cs-Te photocathode RF-Gun and its application. We tried to generate terahertz wave by the coherent radiation and to measure its spectrum by a time-domain spectroscopy (TDS) technique. Adopting this technique, ultra-short laser pulse is needed as probe light. A terahertz waveform appears by delaying the timing of probe pulse. A spectrum of terahertz wave is also led by the waveform, by using the Fourier transform. We succeeded in constructing the probe laser system operating at 119 MHz repetition rate. The pulse duration was compressed down to 190 fs (FWHM) by using pulse compressor. We also succeeded in measuring a terahertz radiation from a photoconductive antenna. In this conference, we will report the outline of our terahertz TDS system, recent progress of our laser system, and terahertz wave generation and detection, with the future prospects.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB119

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB132

MCP Based Detectors Installation in European XFEL

photon, ion, radiation, laser

4031

E. Syresin, O.I. Brovko, A.Yu. Grebentsov
JINR, Dubna, Moscow Region, Russia
W. Freund
XFEL. EU, Hamburg, Germany
J. Grünert
European XFEL, Schenefeld, Germany
M.V. Yurkov
DESY, Hamburg, Germany

An important task of the photon beam diagnostics at the European XFEL is providing reliable tools for measurements aiming at the search for and fine tuning of the amplification process in the SASE FEL. Radiation detectors based onμchannel plates (MCP) were prepared for such measurements. These detectors operate in a wide dynamic range from the level of spontaneous emission to the saturation level (between a few nJ to 25 mJ), and in a wide wavelength range from 0.05 nm to 0.4 nm for SASE1 and SASE2, and from 0.4 nm to 5.1 nm for SASE3. Photon pulse energies are measured at the MCP anode and with a photodiode. The transverse photon beam profile is measured by an MCP imager with phosphor screen anode. Three MCP devices are being installed, one in each of the three FEL beamlines (SASE1, SASE2, and SASE3). The units for SASE1 and SASE3 were already installed in the XFEL tunnel, and the technical commissioning of the MCP detectors and their electronics is progressing. Calibration and acceptance test experiments with beam are scheduled for early 2017.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB132

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB149

Characterization of the THz Radiation-Based Bunch Length Measurement System for the NSRRC Photoinjector

radiation, laser, electron, software

4080

C.C. Liang, B.Y. Chen, C.H. Chen, M.C. Chou, S. Fann, C.S. Huang, N.Y. Huang, J.-Y. Hwang, W.K. Lau, A.P. Lee, T.Y. Lee, W.Y. Lin, T.-C. Yu
NSRRC, Hsinchu, Taiwan

A part of high brightness photo-injection (HBI) project at NSRRC is intending to adopt Coherent Transition Radiation (CTR) and Coherent Undulator Radiation (CUR) to generate THz radiation with an ultrashort electron bunch. Such high intensity THz sources allow the THz spectrum to be conducted easily with a THz interferometer and a Golay cell detector. Furthermore, the radiation spectrum carries information of the electron distribution which allows ultrashort electron bunch length measurements. For verifying correct measuring procedure during the CTR and CUR experiments, a conventional THz radiation generated by optical rectification from a ZnTe crystal has been performed. The produced THz pulse was sent into a Michelson interferometer which is designed for the autocorrelation of the intense, sub-mm and mm-wavelength, spatially-coherent radiation pulses. The THz spectrum can be further obtained from the interferogram by the Fourier transform process. In such way, the THz spectrum can be investigated if the result is satisfactory and can be applied on the THz CTR and CUR experiments for the next step.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB149

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK095

High Power X-Band Generation Using Multiple Klystrons and Pulse Compression

klystron, controls, vacuum, network

4311

B.J. Woolley, T. Argyropoulos, N. Catalán Lasheras, G. McMonagle, S.F. Rey, I. Syratchev, W. Wuensch
CERN, Geneva, Switzerland
D. Esperante Pereira
IFIC, Valencia, Spain
J. Tagg
National Instruments Switzerland, Ennetbaden, Switzerland
M. Volpi
The University of Melbourne, Melbourne, Victoria, Australia

CERN has constructed and is operating a new X-band test stand containing two pairs of 12 GHz, 6 MW klystrons. By power combination through hybrid couplers and the use of pulse compressors, up to 45 MW of peak power can be sent to any of 4 test slots at pulse repetition rates up to 400 Hz. The test stand is dedicated to RF conditioning and testing of high gradient accelerating structures for the CLIC study and also future X-band FELs. Operations have been ongoing for a few months, with initial operation dedicated to control algorithm development. Significant progress has been made in understanding the unique challenges of high power RF combination and phase switching using RF hybrids.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK095

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK109

The RF Distribution System for the ESS

cavity, linac, neutron, insertion

4352

T.R. Edgecock, N. Turner
University of Huddersfield, Huddersfield, United Kingdom
P. Aden, D. Naeem, R. Smith
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
A. Sunesson, R.A. Yogi
ESS, Lund, Sweden

The RF distribution system for the European Spallation Source will be one of the largest systems ever built. It will distribute the power from 146 power sources to the two types of ESS cavity at two different frequencies and will use one line per cavity for resilience. It will consist of a total of around 3.5 km of waveguide and coaxial line and over 1500 hundred bends. It is designed to transport this RF power over a distance of up to 40m per line, while minimising losses, avoiding reflections and allowing the monitoring of performance. This contribution will give an overview of the design of the system and its status. Installation is due to start in September 2017.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK109

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA010

Electron Cloud Simulations for the Main Ring of J-PARC

electron, simulation, proton, vacuum

4436

B. Yee-Rendón, R. Muto, K. Ohmi, K. Satou, M. Tomizawa, T. Toyama
KEK, Ibaraki, Japan

The simulation of beam instabilities is a helpful tool to evaluate potential threats against the machine protection of the high intensity beams. At Main Ring (MR) of J-PARC, signals related to the electron cloud have been observed during the slow beam extraction mode. Hence, several studies were conducted to investigate the mechanism that produces it, the results confirmed a strong dependence on the beam intensity and the bunch structure in the formation of the electron cloud, however, the precise explanation of its trigger conditions remains incomplete. To shed light on the problem, electron cloud simulations were done using an updated version of the computational model developed from previous works at KEK. The code employed the signals of the measurements to reproduce the events seen during the surveys.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA010

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA044

Detector Structure Development Using Active And Passive Thermography

target, laser, cavity, experiment

4531

E. Rosenthal, D. Grunwald, G. Natour
Forschungszentrum Jülich GmbH, Central Institute of Engineering, Electronics and Analytics, Jülich, Germany

During the development and production of the mechanical support structures of the PANDA-Micro-Vertex-Detector(MVD)* experiments of passive and active thermography were applied and shown. The combination of mostly carbon-based materials enables the development of lightweight structures, which satisfy the mechanical stability and thermal requirements. The carrier structure of the MVD stripe detector is mainly composed of carbon foams, high fiber content CFC materials and PMI-based foams. This enables to selectively cool areas where heat is generated and to decouple them from the temperature-sensitive areas of the sensor system. Passive thermography is used during our development work mainly to validate the results of thermal simulations, for design optimization and for the functional control of the carrier structure. Additionally active thermography allows us to identify anomalies and thermal disturbances, which remain unnoticed in static processes. Also the investigation and characterization of adhesive layers are possible. For this purpose we developed special software algorithms which are sensitive to small-scale differences in temperature conductivity.
* PANDA Collaboration: W. Erni et al., arXiv: 1207.6581

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA044

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA079

First Optics Design and Beam Performance Simulation of PRAE: Platform for Research and Applications With Electrons at Orsay

electron, instrumentation, optics, gun

4637

A. Faus-Golfe, S. Barsuk, B. Borgo, D. Douillet, M. El Khaldi, L. Garolfi, A. Gonnin, M. Langlet, P. Lepercq, M. Omeich, V. Puill, C. Vallerand
LAL, Orsay, France
P. Ausset, M. Ben Abdillah, S. Blivet, P. Duchesne, B. Genolini, M. Hoballah, G. Hull, R. Kunne, C. Le Galliard, J. Lesrel, D. Marchand, E. J-M. Voutier
IPN, Orsay, France
A. Hrybok, A. Pastushenko
National Taras Shevchenko University of Kyiv, Radiophysical Faculty, Kiev, Ukraine
A. Vnuchenko
IFIC, Valencia, Spain

The PRAE project aims at creating a multidisciplinary R&D facility in the Orsay campus gathering various scientific communities involved in radiobiology, subatomic physics, instrumentation and particle accelerators around an electron accelerator delivering a high-performance beam with energy up to 70 MeV and later 140 MeV, in order to perform a series of unique measurements and future challenging R&D. In addition PRAE will provide a major education and training asset for students and engineers yielding a regional instrument of advanced technology at the heart of the scientific, technological and academic complex of the Paris-Saclay University. In this paper we report the first optics design and performance evaluations of such a multidisciplinary machine, including a first description of future experiments and the required beam instrumentation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA079

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA081

Radiation Tests of Aerospace Components at ELBE

electron, radiation, experiment, gun

4641

Ch. Schneider, D. Bemmerer, P. Michel, D. Stach
HZDR, Dresden, Germany

The cw electron accelerator ELBE operates mainly in the beam energy range 6 to 32 MeV and beam current range 1μA to 1mA. For most experiments a thermionic gun is used as electron source. The cw electron pulse structure so as the pulse charge is realized by applying electrical pulses with specific amplitudes and frequencies on the grid of the gun. The standard cw operation frequency is 13 MHz but can be divided sequentially by the factor 2 down to 101 kHz. For very special pulse structures a so called single pulser module exist performing different patterns also with dark current suppression via a macro pulser gate. For evaluating the performance and hardness under irradiation of e.g. aerospace components much lower doses respectively currents lower than the μA range are required. Furthermore reproducible and stable doses in a specific area for consecutively radiation of samples are necessary. In the presentation the investigations and concepts used at ELBE for the irradiation of different aerospace components are described.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA081

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA091

Diagnostics Methods for the Medium Energy Proton Beam Extracted by the TOP IMPLART Linear Accelerator

proton, linac, radiation, diagnostics

4673

M. Vadrucci, A. Ampollini, P. Nenzi, L. Picardi, C. Ronsivalle, E. Trinca
ENEA C.R. Frascati, Frascati (Roma), Italy
E. Cisbani, F. Ghio
ISS, Rome, Italy
M. Marinelli, G. Prestopino, G. Verona Rinati
INFN - Roma Tor Vergata, Roma, Italy
C. Placido
University of Rome La Sapienza, Rome, Italy

Funding: This material is based upon work supported by the Regione Lazio/Italy
The Italian TOP IMPLART project aims to develop the first proton linear accelerator for cancer radiotherapy. A 150MeV proton LINAC is under construction at the ENEA Frascati research center: currently the machine is composed by a 7MeV injector operating at 425MHz and four 3GHz SCDTL modules producing a proton beam of 35MeV. Operational procedures for irradiation of samples need careful measurements of average beam current, transverse distribution and pulse charge by different monitor types placed along the beam line. The injected current in the high frequency segment of the accelerator is measured by a Fast Current Transformer (FCT) at the entrance of the SCDTL modules and the pulsed current of the accelerated beam is measured by a second FCT, placed in air, at the exit. The output proton beam shape and intensity are measured by an integral ionization chamber, a double (XY) multistrip ionization chamber, a synthetic single crystal diamond detector and a Faraday cup. In this work, the results of these multiple diagnostic tools applied to different operating conditions of the machine are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA091

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA098

Development of a 3.95 Mev X-Band Linac-Driven X-Ray Combined Neutron Source

neutron, target, experiment, linac

4692

J.M. Bereder, K. Dobashi, Y. Mitsuya, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
M. Ishida, Y. Ohshima
PWRI, Ibaraki, Japan
J. Kusano
Accuthera Inc., Kawasaki, Kanagawa, Japan
Y. Takahashi
The University of Tokyo, Tokyo, Japan
Y. Tanaka
The University of Tokyo, Institute of Industrial Science, Tokyo, Japan

Funding: Council for Science, Technology and Innovation (CSTI), Cross-Ministrial Strategic Innovation Promo-tion Program (SIP), Japan Science and Technoogy Agency (JST)
The existing non-destructive inspection method employed for concrete structures uses high energy X-rays to detect internal flaws in concrete structures and iron reinforcing rods. In addition to this conventional method, the authors are developing an innovative inspection system that uses a mobile compact linac-driven neutron source that utilizes neutron backscattering, to measure the moisture content in concrete structures and estimate the corrosion probability distribution of iron reinforcing rods. By combining the knowledge of the moisture distribution in concrete structures with the information of its inner structure, the remaining life of concrete structures can be estimated. Further experiments will be conducted in the laboratory, and the moisture detection experiment in the real bridge is scheduled for 2017.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA098

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA102

Structural Analysis and Evaluation of Actual PC Bridge Using 950 keV/3.95 MeV X-Band Linacs

linac, site, experiment, target

4701

H. Takeuchi, R. Yano
The University of Tokyo, Tokyo, Japan
K. Dobashi, Y. Mitsuya, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
M. Ishida, Y. Ohshima
PWRI, Ibaraki, Japan
J. Kusano
Accuthera Inc., Kawasaki, Kanagawa, Japan
I. Ozawa
The University of Tokyo, The School of Engineering, Tokyo, Japan

Funding: This work was supported by Council for Science, Technology and Innovation(CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP) (Funding agency: JST).
In Japan, bridges constructed in the highly economic growth era are facing to aging problem and advanced maintenance methods have been strongly required recently. To meet this demand, we develop the on-site inspection system using 950 keV/3.95 MeV X-band (9.3 GHz) linac X-ray sources*. These systems can visualize in seconds the inner states of bridge, including cracks of concrete, location and state of tendons (wires) and other imperfections. We focused on the inspection for wires which are critical to the safety of bridge. At the on-site inspections, the X-ray inspection system exhibited sufficient accuracy to detect the wire's corrosion. We also evaluated the maximum thickness of concrete to which our system can be applied. Using the 950 keV system, we conducted on-site inspection for real bridges and performed structural analysis to evaluate the bearing capacity of the bridge using finite element method. We plan to apply the 3.95 MeV linac for actual bridge inspection to extend the applicable range in 2017. For accurate visualization, the parallel motion CT technique for bridge inspection is in progress.
* Mitsuru Ueaska et al, On-site nondestructive inspection by upgraded portable 950keV/3.95MeV X-band linac x-ray sources, J. Phys. B: At. Mol. Opt. Phys. 47(2014) 234008 (9pp)

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA102

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA128

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

proton, quadrupole, 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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA128

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA129

Spatial Distributions of natU(n, f), 238U(n, g) Reaction Rates in Spallation Neutron Fields Produced by Deuterons and 12C Ions on the Massive Uranium Target

target, neutron, experiment, simulation

4753

A. Zhadan, V.V. Sotnikov, V.A. Voronko
NSC/KIPT, Kharkov, Ukraine
S.I. Tyutyunnikov
JINR, Dubna, Moscow Region, Russia
P. Zhivkov
INRNE, Sofia, Bulgaria

The results of the experiments carried out within the framework of Energy and Transmutation of RAW at JINR NUCLOTRON accelerator are presented. The target assembly QUINTA consisting of 512 kg natural uranium was irradiated by deuteron and carbon beams with energies 1, 2, 4 and 8 GeV (deuterons), 24 and 48 GeV (carbon). Spatial distribution and total number of capture reaction and fission reaction rates was obtained using the activation technique. The integral number of fissions reactions in the volume of uranium target remains approximately constant within our statistical errors for 1, 2, 4 and 8 GeV deuteron beams and for 24 and 48 GeV carbon beams (per one primary particle and per 1 GeV of beam energy). For the integral number of capture reactions with deuteron beams we have seen maximum at 2 GeV. Some of the obtained experimental data was analyzed using the MCNPX transport code. For spatial distribution of reaction rates in case of 4 and 8 GeV deuteron beams we have seen a discrepancy between the experimental and calculated values in backward direction.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA129

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA136

Non-Invasive Online Beam Monitor Using LHCb VELO

proton, laser, medical-accelerators, electronics

4780

R. Schnuerer
The University of Liverpool, Liverpool, United Kingdom
C.P. Welsch, S.L. Yap, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom

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
Online beam monitoring is essential for ion beam therapy to assure effective delivery of the beam and maintain patient safety for cancer treatment. One candidate for such a monitoring device is the LHCb Vertex Locator (VELO) detector. It is a position sensitive silicon detector with an advantageous semi-circular design which enables approaching the core of the beam without interfering with it. In this contribution, tests using an infrared laser to calibrate the detector and obtain information about its dynamic range, spatial and time resolution will be discussed. Initial results from using the detector at the 60 MeV proton therapy beamline at the Clatterbridge Cancer Centre (CCC), UK are also presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA136

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA137

A Monte Carlo Approach to Imaging and Dose Simulations in Realistic Phantoms Using Compact X-Ray Source

simulation, photon, electron, radiation

4783

E. Skordis, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
E. Skordis, V. Vlachoudis
CERN, Geneva, Switzerland
C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

X-ray emitters are amongst the most widely used tools in medicine. Based on compact electron beams, they are utilised for a range of applications, including medical imaging and cancer treatment. The optimisation of a specific X-ray source relies on detailed simulation studies into the achievable resolution and intensity distribution. Monte Carlo (MC) codes are widely used in the medical community for dose estimation to patients and the environment. They are also ideally suited for simulating 3D intensity distributions in realistic environments. This demands accurate and reliable physical models capable of handling all components of the expected radiation field. In this paper the capabilities of the FLUKA MC code to simulate complex X-ray sources are presented. Advanced phantoms, based on imported DICOM format, are used to evaluate the dose to relevant areas, including the patient, individual organs and the treatment room. It is also shown how they can provide a good basis to reproduce radiography images by scoring photon fluencies.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA137

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPVA138

Optimization of Medical Accelerators within the OMA Project

proton, ion, network, medical-accelerators

4787

C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement No 675265.
Although significant progress has been made in the use of particle beams for cancer treatment, an extensive research and development program is still needed to maximize the healthcare benefits from these therapies. The Optimization of Medical Accelerators (OMA) is the aim of a new European Network. OMA joins universities, research centers and clinical facilities with industry partners to address the challenges in treatment facility design and optimization, numerical simulations for the development of advanced treatment schemes, and in beam imaging and treatment monitoring. This contribution gives an overview of the 15 R&D projects that are covered within the project and reports on initial results.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA138

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

FRYAA1

Discovery of the Island of Stability for Super Heavy Elements

neutron, target, ion, heavy-ion

4848

Y.T. Oganessian
JINR, Dubna, Moscow Region, Russia

The existence of a region of hypothetical Super Heavy Elements (SHE) forming region (island) with high stability in the vicinity of the doubly magic nucleus 298 114 was postulated in the mid-1960s. For more than 30 years, scientists hard searched for naturally occurring SHEs and unsuccessfully attempted to synthesize them using heavy ion accelerators. Over the past 15 years the breakthroughs in heavy element synthesis has achieved, using rare actinide targets irradiated with 48Ca beams. More than 52 neutron-rich nuclei including the isotopes of the new element 113-118 and their alpha-decay product where synthesized for the first time. SHE with Z> 40% larger than that of Bi show an impressive extension in nuclear survival: the map of the nuclides have extended up to mass number 294, the 7th row of the periodic Table have completed. The talk will cover this achievement and will give an outlook for the field including any plans at the new facilities: SHE-Factory, SPIRAL-2 and others.

Slides FRYAA1 [9.750 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-FRYAA1

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)