IPAC2019 - List of Keywords (target)

Paper	Title	Other Keywords	Page
MOZPLS2	Ion Collider Precision Measurements With Different Species	operation, electron, experiment, collider	28
	G.J. Marr, E.N. Beebe, I. Blackler, W. Christie, K.A. Drees, P.S. Dyer, A.V. Fedotov, W. Fischer, C.J. Gardner, H. Huang, T. Kanesue, N.A. Kling, V. Litvinenko, C. Liu, Y. Luo, D. Maffei, B. Martin, A. Marusic, K. Mernick, M.G. Minty, C. Naylor, M. Okamura, I. Pinayev, G. Robert-Demolaize, T. Roser, P. Sampson, V. Schoefer, T.C. Shrey, D. Steski, P. Thieberger, J.E. Tuozzolo, K. Zeno, I.Y. Zhang 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. Precedent to electron cooling commissioning and collisions of Gold at various energies at RHIC in 2018, the STAR experiment desired an exploration of the chiral magnetic effect in the quark gluon plasma (QGP) with an isobar run, utilizing Ruthenium and Zirconium. Colliding Zr-96 with Zr-96 and Ru-96 with Ru-96 create the same QGP but in a different magnetic field due to the different charges of the Zr (Z=40) and Ru (Z=44) ions. Since the charge difference is only 10%, the experimental program requires exacting store conditions for both ions. These systematic error concerns presented new challenges for the Collider, including frequent reconfiguration of the Collider for the different ion species, and maintaining level amounts of instantaneous and integrated luminosity between two species. Moreover, making beams of Zr-96 and Ru-96 is challenging since the natural abundances of these isotopes are low. Creating viable enriched source material for Zr-96 required assistance processing from RIKEN, while Ru-96 was provided by a new enrichment facility under commissioning at Oak Ridge National Laboratory.
	Slides MOZPLS2 [4.758 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOZPLS2
About •	paper received ※ 11 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOZZPLM3	Commissioning and First Results of the Fermilab Muon Campus	experiment, positron, proton, MMI	41
	D. Stratakis, B.E. Drendel, J.P. Morgan, M.J. Syphers Fermilab, Batavia, Illinois, USA N.S. Froemming CENPA, Seattle, Washington, USA M.J. Syphers Northern Illinois University, DeKalb, Illinois, USA
	In the following years, the Fermilab Muon Campus will deliver highly polarized muon beams to the Muon g-2 Experiment. The Muon Campus contains a target section wherein secondaries are produced, the delivery ring which separates the muons from the rest of the beam and a sequence of beamlines that transports them to the Muon g-2 storage ring. Here, we report the first results of beam measurements at the Muon Campus with emphasis on the key achievements that have contributed to the successful beam delivery to the Muon g-2 Experiment. These achievements include the production of an intense secondary beam from the target, it’s transport over 2 km, the successful monitoring of muons from the available diagnostics and the development of techniques for measuring the transverse optics. We also present detailed comparisons between experimental data and simulation and discuss the similarities and differences observed.
	Slides MOZZPLM3 [2.846 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOZZPLM3
About •	paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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MOZZPLS2	Positron Driven Muon Source for a Muon Collider: Recent Developments	emittance, damping, collider, positron	49
	M.E. Biagini, M. Antonelli, O.R. Blanco-García, M. Boscolo, A. Ciarma, A. Giribono, S. Guiducci, C. Vaccarezza, A. Variola INFN/LNF, Frascati, Italy A. Bacci INFN-Milano, Milano, Italy M. Bauce, F. Collamati INFN-Roma1, Rome, Italy G. Cesarini INFN-Roma, Roma, Italy I. Chaikovska, R. Chehab LAL, Orsay, France S.M. Liuzzo, P. Raimondi ESRF, Grenoble, France D. Lucchesi Univ. degli Studi di Padova, Padova, Italy N. Pastrone INFN-Torino, Torino, Italy
	The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. The Low Emittance Muon Accelerator (LEMMA) concept ,* presents in this paper an upgraded layout of a positron driven muon source. The positron beam, stored in a ring with high energy acceptance and low emittance, is extracted and driven in a push-pull configuration to a multi-target system, to produce muon pairs at threshold on the target’s electrons. This solution alleviates the issues related to the power deposited and the integrated Peak Energy Density Deposition on the targets. Muons produced in the multi-target system will then be accumulated in many parallel rings before acceleration and injection in the collider. A special multi-target line lattice has been designed to cope with the focusing of both the positron and muon beams. Studies on the number, material and thickness of the targets have been carried out. A general layout of the overall scheme and a description is presented, as well as plans for future R&D. * M. Antonelli, P. Raimondi, INFN-13-22/LNF, 2013 ** M. Boscolo, M. Antonelli, O.R. Blanco-Garcia, S. Guiducci, S. Liuzzo, P. Raimondi, F. Collamati, Phys. Rev. Accel. Beams, vol. 21, p. 061005, 2018
	Slides MOZZPLS2 [4.360 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOZZPLS2
About •	paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPGW011	Field-map and Beam Transport Calculations of the Magnetic Separator at ALTO Facility at Orsay	dipole, ISOL, ion-source, experiment	86
	L. Perrot, R. Ollier IPN, Orsay, France
	The Institute of Nuclear Physics at Orsay (IPN-Orsay) has always been a major player in building accelerators for nuclear physics. The ALTO facility is powered by a 50 MeV/10μA linear electron accelerator dedicated to the production of radioactive beams. The production mode is based on the photo-fission process of a thick UCx target heated up to 2000°C and using the ISOL technique. For the ionization of the released fission fragments, three ion source types can be coupled to the target: Febiad ion source, surface ion source, and laser ion source. The facility can deliver the radioactive ions beams to six different experimental set-ups. The mono-charged RIB exiting from the source must be separated using a magnetic dipole in order to select a nucleus before its transmission through electrostatic devices up to the experimental set-ups. This paper is focus on the separator which was build and exploited with success since 40 years. We propose to revisit this dipole with a precise field-map calculation and particles transport simulations. These results will be use as a first brick of the understanding and reliability of the transmission along the RIB lines at the ALTO facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW011
About •	paper received ※ 19 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019
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MOPGW023	An Algorithm for Automated Lattice Design of Transfer Lines	quadrupole, lattice, focusing, dipole	127
	S. Reimann, M. Droba, O. Meusel, H. Podlech IAP, Frankfurt am Main, Germany
	Since the last 20 years, modern heuristic algorithms and machine learning have been increasingly used for several purposes in accelerator technology and physics. Since computing power has become less and less of a limiting factor, these tools have become part of the physicist community’s standard toolkit. This paper describes the construction of an algorithm that can be used to generate an optimised lattice design for transfer lines under the consideration of restrictions that usually limit design options in reality. The developed algorithm has been applied to the existing SIS18 to HADES transfer line in GSI.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW023
About •	paper received ※ 28 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019
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MOPGW026	Transfer Line Optics Design Using Machine Learning Techniques	simulation, quadrupole, optics, operation	139
	D.M. Vilsmeier IAP, Frankfurt am Main, Germany M. Bai, M. Sapinski GSI, Darmstadt, Germany
	Optimization of transfer line optics is essential for delivering high quality beams to the experimental areas. This type of optimization is usually done by hand and relies on the experience of operators. The nature of this task is repetitive though highly complex. Besides optimizing the beam quality at the experiments this task is often accompanied by secondary objectives or requirements such as keeping the beam losses below an acceptable threshold. In the past years Deep Learning algorithms have experienced a rapid development and gave rise to various advanced software implementations which allow for straightforward usage of corresponding techniques, such as automatic differentiation and gradient backpropagation. We investigate the applicability and performance of these techniques in the field of transfer line optics optimization, specifically for the HADES beamline at GSI, in form of gradient-based differentiable simulators. We test our setup on results obtained from MADX simulations and compare our findings to different gradient-free optimization methods. Successfully employing such methods relieves operators from the tedious optimization tasks.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW026
About •	paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPGW041	Transverse Profile Shaping of a Charged-Particle Beam using Multipole Magnets - Formation of Hollow Beams -	octupole, optics, multipole, radiation	184
	Y. Yuri, T. Yuyama QST/Takasaki, Takasaki, Japan M. Fukuda RCNP, Osaka, Japan
	The use of multipole magnets enables us to shape the transverse profile of a charged-particle beam into various ones that can never be realized through linear beam optics. To date, the formation of a large-area beam with a uniform transverse intensity distribution has been actually realized using octupole magnets in several accelerator facilities. In this presentation, we demonstrate the formation of different beam profiles using multipole magnets rather than existing rectangular uniform beams. Results of tracking simulations and beam-formation experiments will be shown on the formation of clear-cut beams with different cross-sectional shapes, depending on the order and strength of applied multipole magnets. The dynamic behavior of a beam focused with multipole magnets is also investigated theoretically to better understand the numerical and experimental results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW041
About •	paper received ※ 19 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPGW046	Proton Beam Steering for the Experimental Muon Source at CSNS	proton, solenoid, extraction, neutron	193
	Y.K. Chen, H.T. Jing IHEP CSNS, Guangdong Province, People’s Republic of China C. Meng, Y.P. Song, J.Y. Tang, G. Zhao IHEP, Beijing, People’s Republic of China
	Experimental Muon Source (EMuS) is a muon source to be built at China Spallation Neutron Source (CSNS). The EMuS baseline design adopts a stand-alone target sitting in capture superconducting solenoids, and the muon beam is extracted in the forward direction. In the same time the spent protons are also extracted from the target station and guided to an external. Because there is an angle of 15 degrees between the axis of solenoids and the proton direction, the protons will be deviated by the solenoid field. A pair of correction magnets in front of the solenoids is used to align the incoming proton beam to the target and also guide the spent protons to the beam dump. As the target station is design to work at different field level, this increases the complexity of the proton beam transport.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW046
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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MOPGW060	Cherenkov Radiation at Off-Axis Bunch Passage Through Dielectric Concentrator	radiation, diagnostics, site, polarization	225
	S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev Saint Petersburg State University, Saint Petersburg, Russia
	Funding: Work supported by the Grant from Russian Foundation for Basic Research (No. 17-52-04107). Development of tunable systems for non-invasive bunch diagnostics is a modern trend in accelerator physics. Certain dielectric targets are considered in this context, for example, dielectric cones or prisms. Moreover, all-dielectric target which increase the radiated Cherenkov field near the predetermined focus up to several orders of magnitude has been described* and field near its focus and sensitivity of this target have been analyzed*. Here we consider a non-symmetrical case where charge trajectory has a shift with respect to structure axis. We develop analytical approach for description of Cherenkov radiation, perform three-dimensional simulations and compare the results. S.N. Galyamin and A.V. Tyukhtin, Phys. Rev. Lett., 113, 064802 (2014). ** S.N. Galyamin and A.V. Tyukhtin, Nucl. Instr. Meth. Phys. Res. B. 2017. V. 402. P.185-189.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW060
About •	paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPGW069	Recent Beam Performance Achievements with the Pb-Ion Beam in the SPS for LHC Physics Runs	injection, optics, luminosity, flattop	250
	H. Bartosik, R. Alemany-Fernández, T. Argyropoulos, T. Bohl, H. Damerau, V. Kain, G. Papotti, G. Rumolo, A. Saá Hernández, E.N. Shaposhnikova CERN, Meyrin, Switzerland
	In the SPS, which is the last accelerator in the LHC ion injector chain, multiple injections of the Pb-ion beam have to be accumulated. On this injection plateau the beam suffers from considerable degradation such as emittance growth and losses. This paper summarises the achievements on improving the beam parameters and maximising the performance of the Pb-ion beam for the LHC physics run in 2018. The results are discussed in view of the target beam parameters of the LHC injectors upgrade project, which is being deployed during the presently ongoing long shutdown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW069
About •	paper received ※ 12 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019
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MOPGW072	Reconfiguration of SPS Landau Octupole Circuits to Minimise Second Order Chromaticity	octupole, optics, operation, acceleration	262
	H. Bartosik, M. Carlà, K. Cornelis CERN, Meyrin, Switzerland
	In the SPS Q20 optics presently used for LHC beams, the Landau octupole families of the SPS (LOF and LOD circuits) generate large second order chromaticity due to the relatively high dispersion at their locations. Since the induced second order chromaticity results in enhanced losses due to the large incoherent tune spread, these octupoles cannot be used for mitigating transverse instabilities for LHC beams. A new cabling scheme was proposed, exploiting additional octupoles that were already installed in the machine but not used, which allows minimizing the induced second order chromaticity in both the Q20 optics used for LHC beams, as well as the original SPS optics used for fixed target beams. This paper summarises the optics calculations as well as the experimental verification of the reduced chromatic detuning of the new octupole scheme.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW072
About •	paper received ※ 12 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019
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MOPMP003	Positron Source for FCC-ee	positron, linac, electron, collider	424
	I. Chaikovska, R. Chehab, A. Faus-Golfe, Y. Han LAL, Orsay, France A. Apyan ANSL, Yerevan, Armenia Y. Enomoto, K. Furukawa, T. Kamitani, F. Miyahara, M. Satoh, Y. Seimiya, T. Suwada KEK, Ibaraki, Japan P.V. Martyshkin BINP SB RAS, Novosibirsk, Russia S. Ogur, K. Oide, Y. Papaphilippou, L. Rinolfi, P. Sievers, F. Zimmermann CERN, Geneva, Switzerland
	The FCC-ee is a high-luminosity, high-precision circular collider to be constructed in a new 100 km tunnel in the Geneva area. The physics case is well established and the FCC-ee operation is foreseen at 91 GeV (Z-pole), 160 GeV (W pair production threshold), 240 GeV (Higgs resonance) and 365 GeV (t-tbar threshold). Due to the large 6D production emittance and important thermal load in the production target, the positron injector, in particular the positron source, is one of the key elements of the FCC-ee, requiring special attention. To ensure high reliability of the positron source, conventional and hybrid targets are currently under study. The final choice of the positron target will be made based on the estimated performances. In this framework, we present a preliminary design of the FCC-ee positron source, with detailed simulation studies of positron production, capture and primary acceleration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP003
About •	paper received ※ 03 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPMP005	Field Quality for the Hadron Option of Future Circular Collider	injection, dipole, octupole, collider	4397
	B. Dalena, D. Boutin CEA-IRFU, Gif-sur-Yvette, France A. Chancé CEA-DRF-IRFU, France E. Cruz Alaniz The University of Liverpool, Liverpool, United Kingdom D. Schulte CERN, Meyrin, Switzerland
	Funding: This Research and Innovation Action project submitted to call H₂020-INFRADEV-1-2014-1 receives funding from the European Union’s H₂020 Framework Program under grant agreement No. 654305. The updated field quality for the baseline design option of the Nb₃Sn dipoles for Future Circular Collider (FCC-hh) is discussed. The impact on the expected dynamic aperture is shown at injection and collision energy and the consequent non-linear correction schemes together with their integration in the optics are defined.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP005
About •	paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPMP013	New Nuclotron Beam Lines and Stations for Applied Researches	radiation, dipole, heavy-ion, diagnostics	449
	E. Syresin, A.A. Baldin, A.V. Butenko, G.A. Filatov, A.A. Slivin, G.N. Timoshenko, G.V. Trubnikov, A. Tuzikov JINR, Dubna, Moscow Region, Russia D.V. Bobrovskiy, A.I. Chumakov MEPhI, Moscow, Russia M.M. Kats, T. Kulevoy, D.A. Liakin, Y.E. Titarenko ITEP, Moscow, Russia
	New beamlines for applied researches on the Nuclotron are under development within the framework of implementation of the NICA accelerator facility. Ion beams with energies of 150-800 MeV/n extracted from the Nuclotron will be used for radiobiological researches and modeling of cosmic rays interactions with microchips. Equipment of two experimental stations is under development by the JINR-ITEP-MEPhi collaboration for these applied researches. Ion beams with the energy of 3.2 MeV/n extracted from the heavy ion linac HILAc will also be used for irradiation and testing of microchips. The specialized channel will be reconstructed for investigations in the field of relativistic nuclear power at light ion energies of 0.3-4.5 GeV/n. Three new experimental areas are organized for applied physics researches within the framework of implementation of the NICA accelerator facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP013
About •	paper received ※ 29 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPRB003	Multi-Target Lattice for Muon Production From e⁺ Beam Annihilation on Target	positron, emittance, lattice, site	578
	O.R. Blanco-García LAL, Orsay, France M. Antonelli, M.E. Biagini, M. Boscolo, A. Ciarma, S. Guiducci, C. Vaccarezza, A. Variola INFN/LNF, Frascati, Italy G. Cesarini INFN-Roma, Roma, Italy F. Collamati INFN-Roma1, Rome, Italy R. Li Voti Sapienza University of Rome, Rome, Italy P. Raimondi ESRF, Grenoble, France
	The Low Emittance Muon Accelerator~(LEMMA) aims at producing small emittance muons from positron annihilation with electrons in a target. Given the low cross section of the production process, a large number of positrons on the target are required, exposing it to high power deposition and the beam to large degradation because of multiple scattering and bremstrahlung. A multi-target IP, and multi-IP line has been studied to reduce the power deposition per target and the degradation of the positron beam while preserving the number of muon pairs produced. The lattice copes with the focusing and transport of three beams at two different energies, the positron beam at 45 GeV, and µ⁺+ and µ⁻ beams at 22.5~GeV. Studies on the beam dynamics, number of targets, material and thickness of the targets are reported in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB003
About •	paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPRB004	The European Spallation Source Neutrino Super Beam Design Study	proton, linac, neutron, detector	582
	M. Dracos, E. Bouquerel IPHC, Strasbourg Cedex 2, France G. Fanourakis Institute of Nuclear and Particle Physics, Attiki, Greece G. Gokbulut, A. Kayis Topaksu Cukurova University, Adana, Turkey
	Funding: This project is supported by the COST Action CA15139 EuroNuNet. It has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419. The discovery of oscillations and the latest progress in neutrino physics will make possible to observe for the first time a possible CP violation at the level of leptons. This will help to understand the disappearance of antimatter in the Universe. The ESSnuSB* project proposes to use the proton linac of the ESS currently under construction to produce a very intense neutrino Super Beam, in parallel with the spallation neutron production. The ESS linac is expected to deliver 5 MW average power, 2 GeV proton beam, with a rate of 14 Hz and pulse duration of 2.86 ms. By doubling the pulse rate, 5 MW power more can be provided for the production of the neutrino beam. In order to shorten the proton pulse duration to few μs requested by the neutrino facility, an accumulation ring is needed, imposing the use and acceleration of H⁻ instead of protons in the linac. The neutrino facility also needs a separate target station with a different design than the one of the neutron facility. On top of the target, a hadron magnetic collecting device is needed in order to focus the emerging hadrons from the target and obtain an intense neutrino beam directed towards the neutrino detector. A Very Intense Neutrino Super Beam Experiment for Leptonic CP Violation Discovery based on the European Spallation Source Linac, Nuclear Physics B, Vol 885, Aug 2014, 127-149, arXiv:1309.7022.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB004
About •	paper received ※ 10 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPRB019	Beam Optics Study on FFA-MERIT Ring	injection, proton, betatron, acceleration	613
	H. Okita, Y. Ishi, Y. Kuriyama, Y. Mori, Y. Ono, A. Taniguchi, T. Uesugi Kyoto University, Research Reactor Institute, Osaka, Japan N. Ikeda, Y. Yonemura Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka, Japan M. Kinsho, K. Okabe, M. Yoshimoto JAEA/J-PARC, Tokai-mura, Japan Y. Miyake KEK, Tokai, Ibaraki, Japan M. Muto New Affiliation Request Pending, -TBS-, Unknown A. Sato Osaka University, Osaka, Japan
	Funding: This work was funded by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan). Intense negative muon source MERIT (Multiplex Energy Recovery Internal Target) for the nuclear transformation to mitigate the long lived fission products from nuclear plants has been proposed. For the purpose of proof-of-principle of MERIT scheme, FFA ring has been developed. The results of beam optics study for MERIT ring will be reported in this conference.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB019
About •	paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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MOPRB021	Remodeling of 150 MeV FFAG Main Ring at KURNS to Pion Production Ring	FFAG, proton, focusing, resonance	616
	K. Suga, Y. Fuwa, Y. Ishi, Y. Kuriyama, Y. Mori, H. Okita, T. Uesugi Kyoto University, Research Reactor Institute, Osaka, Japan
	A possibility of remodeling main ring of 150 MeV FFAG accelerator at Kyoto University, Institute for Integrated Radiation and Nuclear Science (KURNS) to Pion Production Ring (PPR) for muon transmutation study has been discussed. Design was made on the assumption that 400 MeV proton beams circulate and hit a target in the ring to generate pions. Optimizations of lattice parameters and 3D magnet modeling are reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB021
About •	paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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MOPRB026	High-Quality Muon Beam Production Based on Superconducting Solenoids	proton, polarization, experiment, solenoid	630
	Y. Bao, X. Li, Y. Li, Y.P. Song, X. Tong IHEP, Beijing, People’s Republic of China
	Funding: This work is supported by the Science Foundation of The Chinese Academy of Sciences and National Natural Science Foundation of China (No. 11875281) In labs, muon beams are produced by protons hitting targets. The initial phase space of the muon beam is extremely large. In general, two types of muon collection methods have been used in the world. One is to put the muon production target in a superconducting solenoid, and low-energy muons are collected from the back of the target, then transported through a bent solenoid. In this way, a high-intensity muon beam can be collected, but the energy spread is wide and the beam polarization is low. For most muSR applications a surface muon beam with narrow energy bite and high polarization is required. Most muSR facilities are built with collecting magnets by the side of the target, in this way only a small fraction of muons with low emittance are collected and transported downstream. In this work we outline a muon collection method based on superconducting solenoid. Instead of using bent solenoids, a matching section with a dipole magnet is used to select muons with a certain momentum and match to downstream beamliines. A high-quality muon beam can be achieved with a high intensity and polarization. Such a method can be adapted to the MUSIC, Mu2e, and COMET muon beamlines after their dedicate experiments and convert the beamlines into a high quality muSR facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB026
About •	paper received ※ 30 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPRB028	Application of WCM in Beam Commissioning of RCS in CSNS	proton, neutron, bunching, MMI	636
	M.T. Li, F. Li IHEP CSNS, Guangdong Province, People’s Republic of China Y.W. An, S.Y. Xu, T.G. Xu IHEP, Beijing, People’s Republic of China
	Wall Current Monitor (WCM) is the only beam instru-ment in RCS of CSNS. It is utilized to derive many kinds of physics parameters during beam commissioning. The longitudinal phase distribution of the bunch over the boosting time is deduced for our future analyzation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB028
About •	paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPRB046	Status of the ESSnuSB Accumulator Design	linac, space-charge, injection, simulation	666
	Y. Zou, T.J.C. Ekelöf, M. Olvegård, R.J.M.Y. Ruber Uppsala University, Uppsala, Sweden E. Bouquerel, M. Dracos IPHC, Strasbourg Cedex 2, France M. Eshraqi, B. Gålnander ESS, Lund, Sweden H.O. Schönauer, E.H.M. Wildner CERN, Geneva, Switzerland
	Funding: This project is supported by the COST Action CA15139 EuroNuNet. It has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419. The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to accelerate additional pulses and send them to a neutrino target, providing an excellent opportunity to produce an unprecedented high performance neutrino beam, the ESS neutrino Super Beam, ESSnuSB, to measure, with precision, the CP violating phase at the 2nd oscillation maximum. In order to comply with the acceptance of the target and horn systems that will form the neutrino super beam, the long pulses from the linac must be compressed by about three orders of magnitude with minimal particle loss, something that will be achieved through multi-turn charge-exchange injection in an accumulator ring. This ring will accommodate over 2·10¹⁴ protons, which means that several design challenges are encountered. Strong space charge forces, low-loss injection with phase space painting, efficient collimation, a reliable charge stripping system, and e-p instabilities are some of the important aspects central to the design work. This paper presents the status of the accumulator ring design, with multi-particle simulations of the injections procedure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB046
About •	paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPRB049	Study of Beam-Gas Interactions at the LHC for the Physics Beyond Colliders Fixed-Target Study	proton, collider, experiment, simulation	673
	C. Boscolo Meneguolo, R. Bruce, F. Cerutti, M. Ferro-Luzzi, M. Giovannozzi, A. Mereghetti, J. Molson, S. Redaelli CERN, Geneva, Switzerland A. Abramov JAI, Egham, Surrey, United Kingdom
	Among several working groups formed in the framework of Physics Beyond Colliders study, launched at CERN in September 2016, there is one investigating specific fixed-target experiment proposals. Of particular interest is the study of high-density unpolarized or polarized gas target to be installed in the LHCb detector, using storage cells to enhance the target density. This work studies the impact of the interactions of 7 TeV proton beams with such gas targets on the LHC machine in terms of particle losses.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB049
About •	paper received ※ 17 April 2019 paper accepted ※ 19 May 2019 issue date ※ 21 June 2019
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MOPRB104	A Parameter Study for Improving the Performance of the Production Target for the Fermilab Muon g-2 Experiment	simulation, experiment, storage-ring, proton	806
	D. Stratakis Fermilab, Batavia, Illinois, USA
	The target station of the Muon g-2 Experiment is one of the central pieces for the production of secondary pions which eventually will decay to the desired mu-ons. In this paper, we report adjustments made to opti-mize its performance. For instance, in the simulation we vary the size of the primary incoming beam and examine its impact on the downstream production. We then compare this with the actual measured beam size upstream of the target. In addition, we examine the sensitivity in performance with the strength of the lithium lens for pion capture and the distance between lens and target. We compare measured data with simu-lation results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB104
About •	paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPTS043	ESS Related Activities at Elettra Sincrotrone Trieste	quadrupole, linac, dipole, MMI	953
	A. Fabris, D. Caiazza, D. Castronovo, M. Cautero, S. Cleva, R. De Monte, R. Fabris, M. Ferianis, A. Gubertini, T.N. Gucin, R. Laghi, G. Loda, C. Pasotti, R. Visintini, S. Grulja Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Elettra Sincrotrone Trieste Research Center (Elettra) is one the Italian Institutions, together with Istituto Nazionale di Fisica Nucleare (INFN) and Consiglio Nazionale delle Ricerche (CNR), committed to the realization of the Italian in-kind contributions for the European Spallation Source. Elettra contributions are concentrated on the proton accelerator and more specifically they concern the construction of the conventional iron-dominated electro-magnets and related power converters to be installed in the superconducting part of the linac and in the High Energy Beam Transport (HEBT), the RF power stations for the superconducting spoke cavity linac section and the wire scanner acquisition system for the beam diagnostics. This paper provides a description of the contributions and an overview of the status of the construction activities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS043
About •	paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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MOPTS081	Design of the Transferline to the ESS Target and Beam Dump at Reduced Beam Energy	linac, quadrupole, ECR, ion-source	1034
	Y.S. Qin, M. Eshraqi, Y. Levinsen, R. Miyamoto ESS, Lund, Sweden
	The European Spallation Source (ESS) linac transfer-lines to the target and beam dump are designed for the 2 GeV beam energy. The commissioning and operation of the accelerator will start at a reduced energy of 571 MeV with the high beta part of the linac unpowered. The beam power at this energy is still above 1 MW and a proper transport from the last accelerating cavity to the target is essential. Beam dynamics design of the High Energy Beam Transport (HEBT) and Accelerator to Target (A2T) are studied based on this reduced energy in this paper, including phase advance optimization and rematch. Among the factors which are analyzed are the envelope and beam size on the target which are kept close to their values at 2 GeV and losses along the linac and the transfer lines.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS081
About •	paper received ※ 10 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUXXPLS2	Negative Muonium Ion Production With a C12A7 Electride Film	experiment, positron, acceleration, electron	1175
	M. Otani, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, K. Shimomura, T. Yamazaki KEK, Tsukuba, Japan K. Hasegawa, Y. Kondo, T. Morishita JAEA/J-PARC, Tokai-mura, Japan T. Iijima, Y. Sue Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan H. Iinuma, Y. Nakazawa Ibaraki University, Ibaraki, Japan K. Inami, M. Yotsuzuka Nagoya University, Nagoya, Japan K. Ishida RIKEN Nishina Center, Wako, Japan R. Kitamura, H.Y. Yasuda University of Tokyo, Tokyo, Japan N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Funding: This work was supported by OSPS KAKENHI Grant Numbers JP15H03666, JP 16H03987, JP18H03707. Negative muonium ion production is one of methods to cool muons. Since its discovery in 1987 by interactions of muons with a metal foil, it has been discussed that the production efficiency would be improved using a low-work function material. C12A7 (12CaO·7AlO3) was a well-known insulator as a constituent of alumina cement, but was recently confirmed to exhibit electric conductivity by electron doping. The C12A7 electride has lower work function (2.9 eV) and it was reported that nearly the same negative current signal as that with a bi-alkali material coated metal were observed in H⁻ formation. In this poster, the negative muonium production measurement with a Al foil and C12A7 electride film will be presented.
	Slides TUXXPLS2 [2.680 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUXXPLS2
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP003	Development of Remote Handleable Axially Decoupled Radiation Resistant Vacuum Seal	vacuum, interface, operation, electron	1233
	R.R. Nagimov, Y. Bylinskii, L. Egoriti, A. Gottberg, G.W. Hodgson, A.N. Koveshnikov, D. Yosifov TRIUMF, Vancouver, Canada
	Funding: ARIEL is funded by the Canada Foundation for Innovation (CFI), the Provinces of AB, BC, MA, ON, QC, and TRIUMF. TRIUMF receives federal funding via a contribution agreement with the NRC of Canada. Advanced Rare IsotopE Laboratory (ARIEL) facility is a major expansion of TRIUMF’s rare isotope research program. Aiming to triple the production of rare isotopes, ARIEL facility includes the new electron linac driver and two target stations for electron and proton beams. Particularities of ARIEL target stations design define the requirements for vacuum interfaces with both primary electron and proton beamlines and rare-isotope beamlines. None of the existing products fully met the requirements, driving the development of custom vacuum interfaces. The design of new vacuum seals is driven both by unique design specifications (limited amount of allowed axial forces, extreme radiation resistance, remote handleability and high repeatability) as well as limitations of the proposed design of beamline infrastructure in the target hall (limited available space and the choice of materials for certain components). This paper discusses preliminary results of the vacuum seal development and presents first results of prototype testing.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP003
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP017	Design of Scanning Magnet Power Supply for HUST-PTF	power-supply, controls, proton, simulation	1269
	X.Y. Li, Y.Y. Hu, Y.J. Lin, P. Tan, X.D. Tu, Y.C. Yu, L.G. Zhang, Z.Q. Zhang HUST, Wuhan, People’s Republic of China
	An active scanning proton therapy facility is being de-veloped at Huazhong University of Science and Technol-ogy（HUST）. By controlling the deflection position of the beam with scanning magnets at different times, the superposition of discrete spot beams will form a specified shape and dose distribution conformal to the target tu-mour. A high precision and fast response power supply is required to deflect the beam quickly and accurately. In this paper, the TOSCA module in Opera3D is used to model and simulate the scanning magnets and to obtain the equivalent inductance of the magnet. Then the calcu-lated equivalent resistance inductance instead of the magnet is used to design the scanning magnet power supply. A high-voltage bridge is utilized to achieve fast response speed, and a low voltage bridge and PI control algorithm is adopted to ensure power supply accuracy. The Simulation result shows that the designed power supply meets the requirements of response speed and accuracy.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP017
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP021	Comparison of TiZrV Non-evaporable Getter Films Deposited by DC Magnetron Sputtering or Quantitative Deposition	vacuum, site, interface, electron	1283
	X.Q. Ge, W. Li, J.Q. Shao, S. Wang, Y.G. Wang, Y. Wang, W. Wei, B. Zhang, Y.X. Zhang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	Ti-Zr-V non-evaporable getter (NEG) films have been widely used in vacuum chambers of various accelerators since their discovery. Recently, we have used a new method called ’quantitative deposition’ to deposit Ti-Zr-V NEG films on nichrome substrates. The surface morphology and surface chemical bonding information were collected by scanning electron microscopy. Although the film deposited by DC magnetron sputtering has more uniform grain growth, smoother grain boundaries and higher porosity, the two films all have porous network structure and can be used as getter films.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP021
About •	paper received ※ 24 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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TUPMP033	Design of the Neutron Imaging Differential Pumping Line at LLNL	neutron, vacuum, shielding, simulation	1312
	J.A. Caggiano, D. Castronovo, P. Fitsos, D.J. Gibson, J. Hall, M.S. Johnson, R.A. Marsh, B. Rusnak LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. The neutron imaging system at LLNL is a radiographic capability for imaging objects with fast, quasi-monoenergetic neutrons at ≤1mm spatial resolution. The neutron production source is a deuteron beam (4 or 7 MeV) incident upon a rotating, high-pressure, windowless, pure-deuterium gas target. The windowless nature of the target combined with the high pressure leads to significant gas leakage upstream of the neutron production target. This leakage degrades the imaging quality by (1) increasing the depth-of-field blurring and (2) increasing the beam diameter and divergence in the transverse direction via angular straggling in the residual gas. To mitigate these effects, and guided by bench tests and simulations, we designed a differential pumping line (DPL) to ensure the highest quality imaging system. The system consists of three primary stages (chambers), each separated by carefully shaped apertures. These apertures can be long and thin with low-angle tapers due to the high quality of the beam optics (convergence at the target < 5mrad) and low emittance of the beam (~5 pi mm-mrad). The primary cascaded roots pumps are sized to remove >99% of the incoming mass flow in each stage, ensuring that by the third stage furthest from the target, turbomolecular pumps are able to operate in a nominal ~mTorr range. We anticipate full system testing with helium in mid 2019.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP033
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPMP050	Conceptual Design of the Diamond-II Vacuum System	vacuum, photon, storage-ring, controls	1362
	M.P. Cox, C. Burrows, A.G. Day, J.A. Dymoke-Bradshaw, R.K. Grant, N.P. Hammond, X. Liu, A.G. Miller, H.S. Shiers, N. Warner DLS, Oxfordshire, United Kingdom
	The conceptual design of the vacuum system for the Diamond-II storage ring upgrade is described. Due to the small vessel cross section, typically 20 mm inside diameter (ID), and the consequent conductance limitation, distributed pumping is provided by non-evaporable getter (NEG) coating supplemented by ion pumps at high gas load locations. In-situ bakeout is incorporated to allow rapid recovery from both planned vacuum interventions and unplanned vacuum events. The vacuum vessels are constructed mainly from copper alloy while stainless steel is used in regions of AC magnets requiring low electrical conductivity. The proposed layout, engineering and build sequence of the vacuum system are described along with gas flow simulations confirming the vacuum performance advantages of NEG-coated vessels compared with uncoated vessels.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP050
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPGW038	Study on Coherent THz Radiation Using Tilt Control of Electron Beam	electron, radiation, solenoid, experiment	1489
	Y. Tadenuma, M. Brameld, T. Murakami, K. Sakaue, M. Washio Waseda University, Tokyo, Japan
	Funding: This work was supported by a research granted from JSPS KAKENHI 17H02821. The terahertz wave is located in the intermediate frequency band between radio waves and light waves, and researches on the light sources such as terahertz quantum cascade laser and femtosecond laser based THz sources are being conducted. As a new terahertz light source, we are studying coherent Cherenkov radiation by using the tilt control of electron beam and irradiating the target medium. Since the radiation intensity of Cherenkov radiation depends on the target medium, comparison of three kinds of medium with different refractive index and density, and optimization of the target shape were performed. In addition, we are going to try quasi monochromatization of radiation by using multi slit to control the form factor of the electron beam. In this presentation, we will report the experimental results of target optimization and quasi monochromatization and the future prospects. S. S. Dhillon, et al., The 2017 terahertz science and technology roadmap, J. Phys. D: Appl. Phys., 50 (2017) 043001.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW038
About •	paper received ※ 12 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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TUPGW086	Energy and RF Cavity Phase Symmetry Enforcement in Multi-Turn ERL Models	cavity, linac, acceleration, electron	1606
	R.M. Koscica, N. Banerjee, C.M. Gulliford, G.H. Hoffstaetter, W. Lou Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	In a multi-pass Energy Recovery Linac (ERL), each cavity must regain all energy expended from beam acceleration during beam deceleration, and the beam should achieve specific energy targets during each loop that returns it to the linac. For full energy recovery, and for every returning beam to meet loop energy requirements, we must optimize the phase and voltage of cavity fields in addition to selecting adequate flight times. If we impose symmetry in time and energy during acceleration and deceleration, fewer parameters are needed, simplifying the optimization. As an example, we present symmetric models of the Cornell BNL ERL Test Accelerator (CBETA) with solutions that satisfy the optimization targets of loop energy and zero cavity loading.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW086
About •	paper received ※ 14 May 2019 paper accepted ※ 19 May 2019 issue date ※ 21 June 2019
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TUPTS115	The Progress in Physical Start-Up of the NSC KIPT Subcritical Neutron Source Facility Driven by an Electron Linear Accelerator	neutron, electron, detector, vacuum	2197
	P. Gladkikh, O.V. Bykhun, I.M. Karnaukhov, A. Mytsykov, V. Stomin, I. Ushakov, A.Y. Zelinsky NSC/KIPT, Kharkov, Ukraine
	National Science Center ’Kharkov Institute of Physics &Technology’ (NSC KIPT), Kharkov, Ukraine and Argonne National Laboratory (ANL), Chicago, USA are jointly constructing and commissioning the Ukraine Neutron Source facility. The facility consists of a subcritical assembly driven by a 100MeV/100kW electron linear accelerator. The electron beam will be used for generating the neutrons for operating the subcritical assembly using tungsten or natural uranium target. The facility is planned to support the Ukraine nuclear industry, and provide a capability for performing reactor physics, material research, and basic science experiments, to produce medical isotopes, train young nuclear professionals. The integrating facility tests were completed at the end of 2018, and physical start-up operation began in 2019. The facility commissioning and current start-up results are presented and discussed in the paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPTS115
About •	paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEYYPLS3	Development of Methods for Calculation of Bunch Radiation in Presence of Dielectric Objects	radiation, simulation, vacuum, focusing	2274
	A.V. Tyukhtin, E.S. Belonogaya, S.N. Galyamin, V.V. Vorobev Saint Petersburg State University, Saint Petersburg, Russia
	Funding: This work was supported by the Russian Science Foundation (Grant # 18-72-10137). Radiation of charged particles moving in presence of dielectric targets is of interests for various applications in accelerator and beam physics. Typically, the size of the target is much larger than the wavelengths under consideration. This fact gives us an obvious small parameter of the problem and allows developing approximate methods of analysis. We develop two methods: "ray-optical method" and "aperture method". These methods can be very effective for all situations where we can find the tangential field components on the "aperture" which is an object boundary illuminated by Cherenkov radiation. We apply the aperture method to different dielectric objects including a prism, a cone, and a ball. Electromagnetic field is analyzed on different distances from the objects. The special attention is given to investigation of the field in the far-field (Fraunhofer) area having large importance for various applications. We obtain analytical results for different objects, demonstrate typical radiation patterns and discuss new physical effects, in particular, the phenomenon of concentration of radiation and effect of "Cherenkov spotlight". Prospects of use of aperture method and ray-optical one for other objects are discussed as well. R.Kieffer et al, PRL, 121, 054802 (2018). ** E.S.Belonogaya et al, JOSA B, 32, 649 (2015); S.N.Galyamin, A.V.Tyukhtin, PRL, 113, 064802 (2014); A.V.Tyukhtin et al, J. Instrum., 13, C02033 (2018).
	Slides WEYYPLS3 [4.063 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEYYPLS3
About •	paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPMP005	Beam Line Optimization Using Derivative-Free Algorithms	experiment, heavy-ion, site, interface	2307
	S. Appel, S. Reimann GSI, Darmstadt, Germany
	The present study focuses on the beam line optimization from the heavy-ion synchrotron SIS18 to the HADES experiment. BOBYQA (Bound Optimization BY Quadratic Approximation) solves bound constrained optimization problems without using derivatives of the objective function. The Bayesian optimization is an other strategy for global optimization of costly, noisy functions without using derivatives. A python programming interface to MADX allow the use of the python implementation of BOBYQA and Bayesian method. This gave the possibility to use tracking simulation with MADX to determine the loss budget for each lattice setting during the optimization and compare both optimization methods.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP005
About •	paper received ※ 29 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPMP027	Update on Beam Transfer Line Design for the SPS Beam Dump Facility	proton, experiment, quadrupole, extraction	2375
	Y. Dutheil, J. Bauche, L.A. Dougherty, M.A. Fraser, B. Goddard, C. Heßler, V. Kain, J. Kurdej, J.A. Uythoven, F.M. Velotti CERN, Geneva, Switzerland
	The SPS Beam Dump Facility (BDF) being studied as part of the Physics Beyond Colliders (PBC) CERN project has recently reached an important milestone with the completion of the comprehensive feasibility study. The BDF is a proposed fixed target facility to be installed in the SPS North Area, to accommodate experiments such as SHiP (Search for Hidden Particles), which is most notably aiming at studying hidden sector particles. This experiment requires a high intensity slowly extracted 400 GeV proton beam with 4·10¹³ protons per 1 s spill to achieve 4·10¹⁹ protons on target per year. The extraction and transport scheme will make use of the first 600 m of the existing North Area extraction line. This contribution presents the status of the design work of the new transfer line and discusses the challenges identified. Aperture studies and failure scenarios are treated and the results discussed. In particular, interlock systems aiming at protecting critical components against the uncontrolled loss of the high energy proton beam are considered. We also present the latest results and implications of the design of a new laminated Lambertson splitter magnet to provide fast switching between the current North Area experiments and the BDF.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP027
About •	paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPMP034	Characterisation of SPS Slow Extraction Spill Quality Degradation	quadrupole, dipole, flattop, extraction	2403
	F.M. Velotti, H. Bartosik, M.C.L. Buzio, K. Cornelis, V. Di Capua, M.A. Fraser, B. Goddard, V. Kain CERN, Meyrin, Switzerland
	The main physics users of the Super Proton Synchrotron (SPS) are the experiments installed in the North Area (NA). They are supplied with slowly extracted protons or heavy ions, exploiting a third integer slow extraction to provide a 4.8 s spill. High duty cycle and constant particle flux are the main requirements. Frequent super cycle changes induce variation of the spill macro structure which directly deteriorate the final spill quality. In this paper, the source of such an effect are investigated. Results of both beam based measurements and direct magnetic measurements on the SPS reference magnets are presented. Finally, a possible strategy to counteract this effect is discussed, in order to try to remove the super cycle changes variation as cause for spill quality deterioration.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP034
About •	paper received ※ 15 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPMP038	Combined MCNP/Turtle Simulation of the SINQ Beam Line at PSI-HIPA	simulation, proton, scattering, optics	2410
	D. Reggiani, D.C. Kiselev, M. Seidel, V. Talanov, M. Wohlmuther PSI, Villigen PSI, Switzerland
	With a nominal beam power of nearly 1.4 MW, the PSI High Intensity Proton Accelerator (HIPA) complex is currently at the forefront of the high intensity frontier of particle accelerators. A key issue of such facilities is the minimization of beam losses that could lead to excessive activation of beam line components. At HIPA, the SINQ beam line is particularly subject to relatively large losses since it receives the highly divergent beam scattered off a 40 or 60 mm thick muon production graphite target (TE). So far, for HIPA, beam line simulations have been carried out only by means of the matrix multiplication codes TRANSPORT and TURTLE. Although very efficient, such tools do not allow a precise determination of beam losses whenever targets and collimators are substantially affecting the beam optics. A true understanding of how beam halo and the low momentum tail contribute to the measured losses can only be achieved by complementing the traditional simulations techniques by a tool that can transport beam particles in different materials and, at the same time, handle complex geometries like the ones of collimators situated in the beam line. Moreover, such an improved beam line simulation would give a significant contribution in evaluating the feasibility of the SINQ beam rotation system currently under study. In this paper we present a simulation of the SINQ beam line combining MCNP models of TE and collimator sections with the TURTLE computation of the magnetic channel.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP038
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPMP048	Development of Spin Rotator and an Absolute Polarimeter for Polarized He-3 at BNL	dipole, polarization, solenoid, scattering	2440
	D. Raparia, G. Atoian, S. Ikeda, R.F. Lambiase, M. Okamura, A. Poblaguev, J. Ritter, S. Trabocchi, A. Zelenski BNL, Upton, Long Island, New York, USA R. Milner, M.M. Musgrave MIT, Cambridge, Massachusetts, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. EBIS Preinjector will provide longitudinally polarized 3He++ ions with about 80% polarization and 5.10¹¹ particles per bunch at 6 MeV, which must be rotated to vertical direction before it ions are injected into the Booster. The 3He++ longitudinal polarization is first rotated to the transverse direction by the 21.5° bending magnet. Then the solenoid spin-rotator rotates the spin to the vertical direction. The spin-rotator will be a pulsed solenoid with a reversible field to enable spin flips. The vertically polarized beam will be returned back to the straight HEBT line by the system of three dipole magnets after the spin rotator solenoid. The low-energy polarimeter can be installed in the straight beam line section after the second dipole magnet. To measure transverse (vertical) polarization of the 3He beam at 5-6 MeV, the spin correlated asymmetry of 3He scattering on a 4He gas target (~5 Torr) will be measured with left/right symmetric strip detectors. Paper will present status of the project.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP048
About •	paper received ※ 19 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPGW019	Performance of the CVD Diamond Based Beam Quality Monitoring System in the HADES Experiment at GSI*	monitoring, detector, experiment, extraction	2507
	A. Rost, T. Galatyuk TU Darmstadt, Darmstadt, Germany J. Adamczewski-Musch, S. Linev, J. Pietraszko, M. Sapinski, M. Traxler GSI, Darmstadt, Germany
	Funding: Work supported by the DFG through GRK 2128 and VH-NG-823. The beam quality monitoring of extracted beams from SIS18 at GSI, transported to the HADES experiment is of great importance to ensure a high efficient data recording. The main detector system used for this purpose is the Start-Veto system which consists of two diamond based sensors made of pcCVD and scCVD diamond materials. Both sensors are equipped with a double-sided strip segmented metallization (300 µm width) which allows a position determination of the beam. Those sensors are able to deliver a time precision <100 ps and can handle rate capabilities up to 10⁷ particles/s/channel. Beside the diamond sensors a plastic scintillation based beam halo detector is used. The read-out of the detectors is based on the TRB3 system. A 264 channel TDC (Time to Digital Converter) is implemented in FPGA technology with 10 ps precision. The TRB3 system serves as a fast and flexible Data Acquisition System (DAQ) with integrated scaler capability. The analysis and online visualization is performed using the Data Acquisition Backbone Core (DABC)* framework. In this contribution the performance of the system, which was used in order to evaluate an Ar and Ag ion beam delivered by the SIS 18 accelerator, will be discussed. * A. Neiser et al., JINST 8 (2013) C12043 ** J. Adamczewski-Musch et al., J.Phys. Conf. Ser. 664 (2015) no.8, 082027
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW019
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPGW022	A Numerical Analysis to Choose the Most Performing Optical Transition Radiation Screen	electron, radiation, brightness, site	2518
	F. Cioeta, D. Alesini, A. Variola INFN/LNF, Frascati (Roma), Italy M. Ciambrella, A. Mostacci Sapienza University of Rome, Rome, Italy D. Cortis, M. Marongiu, V. Pettinacci INFN-Roma, Roma, Italy
	Optical Transition Radiation (OTR) screen represents the most appropriate instrument to measure and verify the characteristics of a beam spot size produced by a particle accelerator. In order to measure such beam properties, OTR screens have to sustain thermal and mechanical stresses due to the energy that several bunches deposit. Owing to these requirements, it is essential to identify the more suitable material to optimize the OTR dimensions and to get reliable measures from the diagnostic system. In this paper, we describe a numerical procedure to choose the most performing material taking into account the physical requirements of a multi-bunch high brightness. The procedure is based on a dedicated ANSYS script able to evaluate the fatigue life time of the material considering a high number of thermal cycles generated by several bunches. The main characteristic of this script is the capability to simulate the real thermal and mechanical effect on the target that the hitting particle beam produces. The numerical procedure has been applied to compare the performance of three relevant materials-Aluminium, Silicon and Graphite simulating a beam hitting with well-known parameters.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW022
About •	paper received ※ 13 May 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019
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WEPGW030	Beam Profile Monitor for Slow Extracted Beam Using Multi-Layered Graphene at J-PARC	electron, extraction, proton, real-time	2532
	Y. Hashimoto, Y. Hori, R. Muto, M. Tomizawa, T. Toyama, M. Uota KEK, Tokai, Ibaraki, Japan M. Endo, H. Sakai Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan M. Murakami, K. Murashima, M. Tachibana, A. Tatami KANEKA, Osaka, Japan
	Extracted-beam profiles in slow extraction at J-PARC has been measured by using secondary electrons emitted from a target array made by multi-layered graphen, in real time during spill time of around 2 seconds. The target array consists of 20 ribbons with width of 1 mm, pitch of 2 mm, and thickness of 1.1 micron. Secondary-electron current at each channel is measured by a current amplifier having sensitivity more than 1 pA. These configuration produces useful information for beam dynamics in slow extraction. We have set this monitor at the entrance of a septum magnet, then we can also measure the last few-turns beam with the extracted beam simultaneously. We will discuss about features of this instrument and recent beam study with 51 kW extracted-beams.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW030
About •	paper received ※ 15 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPGW037	Development of a Dense Gas Sheet Target for a 2D Beam Profile Monitor	electron, experiment, simulation, vacuum	2554
	N. Ogiwara, Y. Hori J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y. Hikichi, J. Kamiya, M. Kinsho JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan I. Yamada Doshisha University, Graduate School of Engineering, Kyoto, Japan
	We have been developing a dense gas sheet target to realize a non-destructive and fast-response beam profile monitor for the accelerators in J-PARC. The beaming effect in vacuum science and technology has been employed for making a gas sheet. The gas sheet with a thickness of ~ 1 mm and the density of 2 x 10^-4 Pa was successfully obtained. Then, we have successfully measured the profiles of the 400 MeV H⁻ ion beam in J-PARC linac by detecting the ions generated through the collision of this gas sheet to the H⁻ beam. This time, we have developed the gas sheet with the density of more than 10-3 Pa using a circular slit. The details of the new gas sheet generator will be shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW037
About •	paper received ※ 20 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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WEPGW039	Multi-Ribbon Profile Monitor for High Power Proton Beam at J-PARC MR Abort Line	proton, extraction, emittance, electron	2561
	K. Sato The University of Tokyo, Graduate School of Science, Tokyo, Japan E. Hamada, Y. Hashimoto, S. Igarashi, T. Koseki, Y. Sato KEK, Tsukuba, Japan
	Japan Proton Accelerator Research Complex (J-PARC) Main Ring (MR), the world-class high intensity proton synchrotron, provides proton beam to two experimental facilities with two extraction modes: Fast extraction (FX) and Slow extraction (SX). The number of protons per pulse (ppp) in MR recorded the world highest value of 2.6×10¹⁴ in the FX mode. Now we are planning to increase the ppp further up to 3.3×10¹⁴ in near future. The beam profile is one of the most important parameters to discuss the high intensity beam dynamics in MR. Monitors using multi-wires / ribbons are effective to measure the beam profile with good accuracy and wide dynamic range. However, they cause significant beam losses by interactions with high-intensity circulating beam in synchrotrons. Recently, we installed new multi-ribbon profile monitor (MRPM) in an abort line in MR. The abort line is one of the extracted beam lines of the FX system. It has a quadrupole doublet which is called Abort Q and transports extracted beam to a beam dump. The FX system can extract the circulating beam in MR with an arbitrary energy. Performing the single-pass measurement with MRPM and changing the transfer matrix by sweeping field strength of Abort Q, the emittance of the extracted beam can be measured. In this paper, we present the design, manufacturing, and results of the first beam test of newly installed MRPM system.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW039
About •	paper received ※ 01 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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WEPGW046	Key Technologies for Remote Detection of CSNS Radiation Environment	vacuum, controls, radiation, operation	2584
	L. Kang, R.H. Liu, X.J. Nie, A.X. Wang, G.Y. Wang, D.H. Zhu IHEP, Beijing, People’s Republic of China J.X. Chen, H.Y. He, L. Liu, C.J. Ning, J.B. Yu, Y.J. Yu, J.S. Zhang IHEP CSNS, Guangdong Province, People’s Republic of China
	Funding: Work supported by National Nature Science Foundation of China (11375217) China Spallation Neutron Source (CSNS) has been continuously operating in September 2018. As the operating time increases the radiation dose will also increase, some equipment maintenance and testing must take special tools and equipment. This article mainly introduced the studies on radiation environment of several detection technologies, such as: remote vacuum leak detection methods and equipment, strong magnetic field environment vibration measuring technology, using Qr code tracing machine walking vehicle inspection system and remote image vision measurement technology, etc., these advanced technology also has a guiding significance to other related fields.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW046
About •	paper received ※ 23 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPGW060	Theoretical Analysis and Experimental Design of Terahertz Single-Pulse Picking based on Plasma Mirror	plasma, laser, electron, FEL	2613
	S.Y. Zhao, M. Li, P. Li, J. Wang, D. Wu, X. Yang CAEP/IAE, Mianyang, Sichuan, People’s Republic of China
	Funding: Work supported by National Natural Science Foundation of China with grant (11505173, 11505174, 11575264, and 11605190) China Academy of Engineering Physics terahertz free electron laser (CTFEL) facility needs a terahertz switch for picking of single-pulse, which can facilitate the experiments that require high peak power but low average power. At present, many researches mainly focus on resonant tunneling effects, tunable metamaterials such as graphene and vanadium dioxide, nonlinear modulation based on the principle of all-optical switching, etc. However, the frequency range of these terahertz switches is generally not applicable to CTFEL(1.87-2.3THz). In this paper, self-induced plasma switching technology is applied to CTFEL. Single-pulse is reflected by a dense plasma in a Ge, Al or fused quartz slab that is photoexcited by laser system. Theoretical analysis and numerical simulation demonstrate the feasibility of the experiment. In addition, schematic layout of the experiment setup and specifications of the major instruments are given.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW060
About •	paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPGW078	Development and Test of a Beam Imaging System Based on Radiation Tolerant Optical Fiber Bundles	radiation, laser, experiment, site	2658
	D. Celeste, E. Bravin, S. Burger, F. Roncarolo CERN, Geneva, Switzerland
	Many of the beam image systems at CERN are located in high radiation environments. In order to cope with this issue, VIDICON cameras are presently used but their production has been nowadays discontinued worldwide. The development of an alternative beam imaging system is described here, based on radiation tolerant optical fibre bundles. Such an optical line relays the image of a scintillating screen to a standard CMOS camera, located away from the high radiation zone. A prototype system based on a 10m long bundle with 10⁴ fibres has been tested in the TT2 transfer line at CERN. The light transmission is rather low, but is compensated by the sensitivity of the CMOS camera. The system had a field of view of 60 mm and a spatial resolution of ~1 mm. The radiation hardness of such a fiber bundle was tested at the IRMA-CEA facility in Saclay, France. The bundle was irradiated at a rate of 3.6 kGy/h for 8 consecutive day. The total integrated dose achieved was ~700 kGy, which corresponds to about ten years of operation at the beam imaging station with the highest radiation dose at CERN. While the light transmission was reduced by 50%, this is still adequate to provide acceptable images.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW078
About •	paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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WEPGW082	The Beam Gas Vertex Profile Monitoring Station for HL-LHC	detector, radiation, real-time, dipole	2672
	R. Kieffer, A. Alexopoulos, L. Fosse, M. Gonzalez Berges, H. Guerin, O.R. Jones, T. Marriott-Dodington, J.W. Storey, R. Veness, S. Vlachos, B. Würkner, C. Zamantzas CERN, Meyrin, Switzerland S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom
	A new instrument is under development for the high luminosity upgrade of the Large Hadron Collider at CERN (HL-LHC) to provide non-invasive beam size measurements throughout the acceleration cycle. The Beam Gas Vertex (BGV) detector consists of a very low pressure gas target inside the beam pipe with a series of particle tracking stations located downstream. Inelastic collisions between the beam and the gas target produce secondary particles which are detected by the tracking stations. The beam size is measured from the spatial distribution of several thousand beam-gas interaction vertices, which are identified by means of the reconstructed tracks. A demonstrator device, operated over the past 3 years, has proven the feasibility of the BGV concept and has motivated development of a fully operational device for the HL-LHC. The status of current design studies for the future instrument will be presented, with particular emphasis on potential tracking detector technologies, readout schemes, and expected performance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW082
About •	paper received ※ 13 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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WEPGW120	Fluorescence-Based Imaging Diagnostic for High Average Power Deuteron Beam	neutron, diagnostics, quadrupole, photon	2777
	R.A. Marsh, S.G. Anderson, D.J. Gibson, J. Hall, B. Rusnak LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Lawrence Livermore National Laboratory is developing an intense, high-brightness fast neutron source to create sub-millimeter-scale resolution neutron radiographs and imag-es. An intense source (10¹¹ n/s/sr at 0 degrees) of fast neutrons (10 MeV) will be produced using a pulsed 7 MeV, 300μAmp average-current commercial deuteron accelerator producing a small (1.5 mm diameter) beam spot size to achieve high resolution. The high average power beam is a challenge for diagnostics, and a precise full power emittance measurement is critical to benchmark the system performance. A fluorescence-based beam profiling diagnostic has been selected, and this paper presents the design for the system including chamber layout, light yield calculations, and imaging system details.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW120
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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WEPRB039	Tuning of a Tapered Ridge-Loaded Waveguide Coupler for a Drift Tube LINAC of the Compact Pulsed Hadron Source	GUI, coupling, DTL, linac	2893
	Y. Lei, C.T. Du, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng TUB, Beijing, People’s Republic of China
	This paper presents the tuning result of a tapered ridge-loaded waveguide coupler for the drift tube linac (DTL) of the compact pulsed hadron source (CPHS) at Tsinghua University. The coupler has been designed, manufactured, and mounted on the DTL cavity for the cold measurement and tuning. The iris diameter of the coupler which is related to the coupling coefficient needs to be determined in the tuning experiment, due to the difference between the designed and measured quality factors. Meanwhile, we found that the relationship between the coupling coefficient and iris diameter from the traditional analytical design method is not applicable when the iris diameter is relatively large. In this paper, the target coupling coeffi-cient is analysed, and the limit of the original analytical design is presented. The measurement method is intro-duced to improve the measurement efficiency and the tuning process of the coupling coefficient to the target value is described. After several iterations, the coupling coefficient is tuned to 1.54 which is close to the desired value of 1.56.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB039
About •	paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPRB070	Facile Deposition of Superconducting MgB₂ Thin Films on Substrates: A Comparative Investigation of Electrochemical Deposition and Magnetron Sputtering Techniques	cavity, site, superconductivity, FEL	2984
	N. Misra, A.N. Hannah, R. Valizadeh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom R. Valizadeh Cockcroft Institute, Warrington, Cheshire, United Kingdom
	Funding: Authors acknowledge the funding received under the Rutherford International Postdoctoral Fellowship Programme Coating of Copper cavities with a superconducting layer of MgB₂ thin film is an attractive alternative to bulk Nb cavities. In this work, we investigate the application of two approaches-electrochemical deposition and magnetron sputtering of MgB₂, to fabricate MgB₂ films with potential accelerator applications. In the first approach, MgB₂ powder dispersed in acetone was used as an electrolytic medium. Application of a DC voltage of 400 V between a graphite anode and a Copper film (serving as cathode), with the electrode distance maintained at ~2cm, resulted in the electrochemical deposition of MgB₂ on the Cu surface. In an alternate approach, MgB₂ in powder form was used directly for sputtering based deposition. The powder was initially compacted to form a thin layer that served as the magnetron target. Application of a pulsed DC power of 25W for 4 hours yielded MgB₂ thin film on Si substrates. Samples were characterized by XPS analysis to ascertain their elemental composition, which confirmed the presence of Mg and B, in addition to traces of C and O as impurities. Surface morphology was determined using SEM characterization technique. Further work to determine the superconducting properties of the samples and fine tune the deposition processes for large scale MgB₂ deposition inside actual RF cavities is in progress.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB070
About •	paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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WEPTS025	MiniScatter, a Simple Geant4 Wrapper	simulation, detector, interface, plasma	3152
	K.N. Sjobak, H. Holmestad University of Oslo, Oslo, Norway
	Funding: Research Council of Norway, project 255196 In order to estimate what happens to particle beams when they hit windows, gas, and various other targets, a simple tool has been developed based on Geant4. This tool wraps geometry setup, primary beam generation from Twiss parameters, visualization, and automatic analysis and plots in a simple-to-use command-line tool. Furthermore, a Jupyter-friendly Python interface for running simulations and parallelized parameter scans is included. The code, its interface, and a few selected examples will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS025
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPTS026	Generalised Scattering Module in SixTrack 5	scattering, lattice, experiment, proton	3156
	K.N. Sjobak University of Oslo, Oslo, Norway H. Burkhardt, R. De Maria, V.K.B. Olsen CERN, Geneva, Switzerland
	Funding: Research Council of Norway, project 255196, and HL-LHC WP8 A generalised scattering module has recently been added to SixTrack. This module enables the use of arbitrary generators and target profiles. Presently, a simple model of elastic scattering and a coupling to Pythia8 have been implemented. This makes it possible to use SixTrack for studies of aperture losses and beam lifetime as a result of beam–beam scattering.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS026
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPTS099	Passive Absorbers for Maximizing the Performance of the Mu2e-II Experiment	experiment, solenoid, proton, collimation	3345
	J. Manczak IFIC, Valencia, Spain J. Manczak Warsaw University, Warsaw, Poland D.V. Neuffer, D. Stratakis Fermilab, Batavia, Illinois, USA
	The Fermilab’s Mu2e experiment is designed to search for Charged Lepton Flavour Violation in direct, neutrinoless conversion of muon into electron in the presence of a nucleus’ electromagnetic field. Quantity, which is going to be observed is the ratio between the rate of the above BSM (Beyond Standard Model) reaction and the rate of the standard muon capture on the nucleus. The measurement precision is expected to reach up to 10^-17. Mu2e-II is the codename for the second phase of the experiment planned to run with the lower energy, higher intensity primary proton beam provided by PIP-II accelerator, currently under construction. The ionization cooling with a wedge absorber is introduced to Mu2e-II setup for potential increase in the number of low momentum muons reaching the target. The study is made into the position and size of the wedge inside the beamline using G4Beamline simulation framework. Results show an increase up to 12% for muons with momentum P below 30 MeV/c and 7% for muons with P<40 MeV/c when the beam is measured right after the wedge. Further studies are necessary to investigate how this gain can be delivered to the stopping target.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS099
About •	paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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WEPTS107	Designing the European Spallation Source Tuning Dump Beam Imaging System	proton, radiation, linac, optics	3374
	M.G. Ibison, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom E. Adli, G. Christoforo, H. Gjersdal University of Oslo, Oslo, Norway M.G. Ibison, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom T.J. Shea, C.A. Thomas ESS, Lund, Sweden
	Funding: In-Kind Agreement, ESS/Norway The first section of the European Spallation Source (ESS) to receive high-energy protons when live operation begins will be the Tuning Dump beam-line. The dump line will be used during accelerator commissioning to tune the linac, and must accept the full range of ESS energies up to 2 GeV, from 5µs probe pulse to full 2.86ms pulse length, and beam sizes up to the 250 mm limit of the physical aperture, although the allowed pulse rate will be restricted by the thermal capacity of the dump. An imaging system has been developed to view remotely the transverse beam profile in the section immediately before the dump entrance, using insertable scintillator screens. This contribution presents the principal design parameters for this system, with particular reference to the techniques used in assessing the radiation and thermal environments and their impact on the selection of locations for the imaging cameras, and the specification of the mechanical screen actuators. The predicted optical performance of the system is also summarised.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS107
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THXPLM1	LHC Injectors Upgrade Project: Towards New Territory Beam Parameters	proton, operation, injection, extraction	3385
	M. Meddahi, R. Alemany-Fernández, H. Bartosik, G. Bellodi, J. Coupard, H. Damerau, G.P. Di Giovanni, F.B. Dos Santos Pedrosa, A. Funken, B. Goddard, K. Hanke, A. Huschauer, V. Kain, A.M. Lombardi, B. Mikulec, S. Prodon, G. Rumolo, R. Scrivens, E.N. Shaposhnikova CERN, Meyrin, Switzerland
	The LHC injectors Upgrade (LIU) project aims at increasing the intensity and brightness in the LHC injectors in order to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring high availability and reliable operation of the injectors complex up to the end of the HL-LHC era (ca. 2035). This requires extensive hardware modifications and new beam dynamics solutions in the entire LHC proton and ion injection chains: the new Linac4, the Proton Synchrotron Booster, the Proton Synchrotron the Super Proton Synchrotron together with the ion PS injectors (the Linac3 and the Low Energy Ion Ring). All hardware modifications will be implemented during the 2019-2020 CERN accelerators shutdown. This talk would analyze the various project phases, share the lessons learned, and conclude on the expected beam parameter reach, together with the related risks.
	Slides THXPLM1 [20.029 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THXPLM1
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THXXPLM1	NUCLOTRON Development for NICA Acceleration Complex	acceleration, proton, extraction, injection	3396
	E. Syresin, N.N. Agapov, A.V. Alfeev, V. Andreev, A.A. Baldin, A.M. Bazanov, O.I. Brovko, V.V. Bugaev, A.V. Butenko, D.E. Donets, E.D. Donets, E.E. Donets, A.V. Eliseev, V.V. Fimushkin, B.V. Golovenskiy, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V. Kekelidze, H.G. Khodzhibagiyan, A. Kirichenko, V.V. Kobets, S.A. Kostromin, A.D. Kovalenko, O.S. Kozlov, K.A. Levterov, D.A. Lyuosev, A.A. Martynov, I.N. Meshkov, V.A. Mikhailov, V.A. Monchinsky, A. Nesterov, A.L. Osipenkov, D.O. Ponkin, S. Romanov, P.A. Rukojatkin, K.V. Shevchenko, I.V. Shirikov, A.A. Shurygin, A.O. Sidorin, V. Slepnev, A.V. Smirnov, G.V. Trubnikov, A. Tuzikov, B. Vasilishin JINR, Dubna, Moscow Region, Russia A. Belov RAS/INR, Moscow, Russia A.V. Philippov, V. Volkov JINR/VBLHEP, Dubna, Moscow region, Russia
	The Nuclotron is the basic facility of JINR used to generate beams of protons, polarized deuterons and protons, and multi charged ions in the energy range of up to 5.6 GeV/n. Polarized deuteron and proton beams were obtained at the intensity of 2×10⁹ ppp and 108 ppp, respectively. The injection with RF adiabatic capture was used in two last Nuclotron runs where C⁶⁺, Xe⁴²⁺, Kr²⁶⁺ and Ar¹⁶⁺ ion beams were accelerated. The resonant stochastic extraction (RF knockout technique) was realized. The complex is now used for fixed target experiments with extracted beams and experiments with an internal target. In the near future, the Nuclotron will be the main synchrotron of the NICA collider facility being constructed at JINR. The installation in the Nuclotron of beam injection system from the Booster and of the fast extraction system in the Collider are required for its operation in the NICA complex. In the frame of the Nuclotron injection chain upgrade, a new light ion linac (LILac) for protons and ions will be built.
	Slides THXXPLM1 [10.806 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THXXPLM1
About •	paper received ※ 29 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPMP005	Charge Stripping at High Energy Heavy Ion Linacs	heavy-ion, linac, acceleration, ion-source	3452
	W.A. Barth, S. Yaramyshev GSI, Darmstadt, Germany W.A. Barth HIM, Mainz, Germany W.A. Barth, T. Kulevoy, S.M. Polozov, S. Yaramyshev MEPhI, Moscow, Russia A.S. Fomichev, L.V. Grigorenko JINR, Dubna, Moscow Region, Russia T. Kulevoy NRC, Moscow, Russia
	For heavy-ion accelerator facilities charge stripping is a key Technology: the stripping charge state, its efficiency to produce ions in the required charge state, and the beam quality after stripping substantially determine the entire accelerator performance. Modern heavy ion accelerator facilities such as the future Facility for Antiproton and Ion Research (FAIR) at GSI provide for high intensity heavy ion beams beyond 200 MeV/u. Heavy ion stripping at a lower energy enables more efficient acceleration up to the final beam energy, compared to acceleration of ions with a low charge state. Due to the high power deposited by the heavy ions in the stripping media and radiation damages if a solid target is used, self-recovering stripper media must be applied. General implementation options for different stripper target media are discussed in this paper, as well as general considerations to optimize the Linac layout through the appropriate choice of stripping medium and stripping energy. The driver Linac for the Dubna Electron-Radioactive Isotope Collider fAcility (DERICA) project, recently initiated by JINR, is foreseen to provide for 100 MeV/u Uranium beam in continuous wave mode. First layout scenarios of a one-step and a two-step DERICA-stripper approach will be also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP005
About •	paper received ※ 22 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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THPMP006	Study on the Theta Pinch Plasmas for Applied as Ion Stripper	plasma, electron, experiment, heavy-ion	3456
	K. Cistakov, Ph. Christ, M. Fröhlich, M. Iberler, J. Jacoby, L. Manganelli, G. Xu IAP, Frankfurt am Main, Germany R. Gavrilin, A. Khurchiev, S.M. Savin ITEP, Moscow, Russia
	Funding: Work supported by BMBF contr. No. 05P18RFRB1 With regard to the development of new accelerator technologies for high-intensity ion beams and more efficient acceleration, the transfer of radiation ions to higher charged states is a prerequisite for many experiments. However, the recent stripping technologies such as film and gas stripper for heavy ion beams with the desired intensities required great effort or are not suitable. The contribution presents the current state of plasma strippers with fully ionized hydrogen with simultaneously high particle densities in the range of some 10¹⁷ cm^-3 for FAIR. To achieve this high particle density, an inductive discharge plasma is ignited within a stripper cell parallel to the axis of the ion beam and compressed towards the beam axis. The advantage over conventional ion strippers is about 1000 times smaller recombination rate for electrons. This significantly increases the equilibrium charge state of ions. At the same time, the relative fraction of ions on the maximum of charge state distribution increases up to 25%. This should create good conditions for the use of plasma strippers at FAIR. Th.Peter, "Energy loss of heavy ions in dense plasma" **O.Haas, "Simulation Studies of plasma-based charge strippers",Proceedings of IPAC 2015, Richmond, VA, USA
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP006
About •	paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019
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THPMP008	Feasibility Study on Mo-99 Production Using Hybrid Method Based on High Power Electron Accelerator	neutron, radiation, electron, photon	3462
	A. Taghibi Khotbeh-Sara, F. Rahmani KNTU, Tehran, Iran F. Ghasemi NSTRI, Tehran, Iran H. Khalafi AEOI, Tehran, Iran M. Mohseni Kejani Shahid Beheshti University, Tehran, Iran
	In this study, the idea 99Mo production using hybrid method based on electron accelerator has been pre-sented. Two different main production channels of 100Mo(γ,n)99Mo and 98Mo(n,γ)99Mo can be used for 99Mo production in this system. By considering high power Linac (30 MeV, 1 mA in average beam current) and one-stage approach, the calculation of 100Mo(γ,n)99Mo reactions in the optimized 100Mo target in two different designs (strip and disc) has been simu-lated. It is predicted that about 61 and 53 Ci of 99Mo activity per 24-hour irradiation on the strip target and the disc plates can be achieved, respectively. The threshold energy of photoneutron at 100Mo is about 9 MeV, so a large part of bremsstrahlung photons cannot participate in photoneutron reaction. For feasibility study, new hybrid approach has been tested by 10 MeV Rhodotron. Due to the low threshold of photo-neutron in deuteron (about 2.2 MeV) and significant low energy photons in 100Mo, photoneutron flux is available. So, Molybdenum target in heavy water Tank increases the production yield of 99Mo using neutron absorption reaction in 98Mo. The total activity of 99Mo has been predicted about 0.23 Ci per 24 hours e-beam irradiation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP008
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPMP012	New Industrial Application Beamline for the cERL in KEK	radiation, electron, linac, vacuum	3475
	Y. Morikawa, K. Haga, M. Hagiwara, K. Harada, N. Higashi, T. Honda, Y. Honda, M. Hosumi, Y. Kamiya, R. Kato, H. Kawata, Y. Kobayashi, H. Matsumura, C. Mitsuda, T. Miura, T. Miyajima, S. Nagahashi, N. Nakamura, K.N. Nigorikawa, T. Nogami, T. Obina, H. Sagehashi, H. Sakai, M. Shimada, M. Tadano, R. Takai, H. Takaki, O.A. Tanaka, Y. Tanimoto, A. Toyoda, T. Uchiyama, A. Ueda, K. Umemori, M. Yamamoto KEK, Ibaraki, Japan
	The new beam line for the industrial applications is constructed at the cERL (compact Energy Recovery LINAC) in KEK. In these applications, only north straight sections of cERL consisting of injector and main LINAC will be used. The test for the radio isotope production and electron beam irradiation for the materials are firstly planned with very small beam current without energy recovery.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP012
About •	paper received ※ 11 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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THPMP021	X-ray Dose Rate of 6/4 MeV European S-band Linac Structure for Industrial Application at RTX	electron, linac, simulation, operation	3494
	P. Buaphad, I.G. Jeong, Y. Joo, H.R. Lee University of Science and Technology of Korea (UST), Daejeon, Republic of Korea I.G. Jeong, J.Y. Lee Korea Atomic Energy Research Institute (KAERI), Daejeon, Republic of Korea Y. Joo, Y. Kim, H.R. Lee KAERI, Daejon, Republic of Korea H.D. Park, S. Song RTX, Daejeon, Republic of Korea
	Recently, RTX has been developing a 6/4 MeV European S-band (= 2998 MHz) industrial linac by using a magnetron with a low RF power of about 3 MW for container inspection system (CIS). Its accelerating structure is designed to operate in π/2 mode by coupling 6 accelerating cells together through 5 side-coupled cells. In CIS, high dose rate X-rays from MeV-energy electron beam has been used to detect the possible presence of contrabands in cargoes or truck containers. To determine a dose rate output, the X-ray dose rate can be simulated by using FLUKA Monte Carlo simulation. The aim of this work was to study the effects of thickness of X-ray target on dose rate as well as X-ray dose map at 1.0 m away from the X-ray target. This study gives the thickness of target in which the dose rate can be highest and electron beam current can be lowest.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP021
About •	paper received ※ 24 May 2019 paper accepted ※ 24 May 2019 issue date ※ 21 June 2019
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THPMP026	Mobile Accelerator Based on Ironless Pulsed Betatron for Dynamic Objects Radiographing	betatron, electron, radiation, ion-source	3500
	V.A. Fomichev, A.A. Chinin, S.G. Kozlov, Yu.P. Kuropatkin, V.I. Nizhegorodtsev, I.N. Romanov, K.V. Savchenko, V.D. Selemir, O.A. Shamro, E.V. Urlin RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia
	The paper concerns a mobile accelerator based on the ironless pulsed betatron. The accelerator has a possibility to obtain up to three frames in a single pulse and is aimed to radiograph dynamic objects with a large optical thickness. The block diagram of the accelerator, the temporal diagram of its separate systems operation and oscillograms of the betatron output parameters are provided. The testing powering in a single frame mode was carried out in 2018. The capacitance of the storage of the betatron electromagnet pulsed powering system that defines the electron beam energy was equal to 1800 μF. The following test results have been obtained. The thickness of the lead test object examined with X-rays reached 140 mm at 4 m from the tantalum target of the betatron. The full width of the output gamma pulse at half maximum in a single frame mode was equal to 120 ns; the dimension of the radiation source was 6 mm x 3 mm; the dimension of the tantalum target was 6 mm x 6 mm. The application of these accelerators within the radiographic complex* enables the optimization of the hydrodynamic experiments geometry resulting in the increase of the test efficiency. * Pat. 2548585 C1 RU MPK G03B 42/02. D.I. Zenkov and others. «Mobile radiographic complex and radiation source of betatron type for radiographic complex» (in Russian), 2015.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP026
About •	paper received ※ 25 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
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THPMP034	Simulating Matter Interactions of Partially Stripped Ions in BDSIM	electron, simulation, hadron, dipole	3514
	A. Abramov, S.T. Boogert, L.J. Nevay JAI, Egham, Surrey, United Kingdom
	Acceleration and storage of beams of relativistic partially stripped ions is more challenging than in the case of fully stripped ions because the interactions with matter, such as those with residual gas and collimators can strip electrons via ionisation. BDSIM is a code for the simulation of energy deposition and charged particle backgrounds in accelerators that uses the Geant4 physics library. Geant4 includes a broad range of ion elastic and inelastic interactions and allows the definition of partially stripped ion beams. However, no models are currently available to handle in-flight interactions involving the bound electrons. In this paper we present a semi-empirical model of beam ion stripping by material atoms that is implemented in BDSIM as an extension of Geant4’s existing physics processes and is fully integrated into a comprehensive set of matter interactions for partially stripped ions. The stripping cross-section for select cases and results from comprehensive simulations are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP034
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPMP036	Beam Dynamics of Novel Hybrid Ion Mass Analysers	detector, site, experiment, injection	3522
	R.B. Appleby, T. Rose UMAN, Manchester, United Kingdom M.R. Green, P. Nixon, K. Richardson Waters Corporation, Manchester, United Kingdom
	Fourier transform (FT) mass spectrometers achieve high resolution using relatively long transient times by trapping ions and measuring the frequency of their motion (inductively) inside an electrostatic potential. By contrast, time-of-flight (ToF) mass spectrometers measure the time of flight between an initiation pulse and contact with a destructive detector positioned on a plane of space focus after flying along a predetermined route. These devices have relatively short flight times and, generally, lower resolution. A class of hybrid analysers have been proposed and studied, utilising a quadro-logarithmic potential to reflect ions multiple times past an inductive detector, with the potential for the short transient of ToF devices - and the high resolution of FT devices. In this paper we compute the ion dynamics inside such devices, tracking bunches of ions and studying induced signals.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP036
About •	paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPMP048	Mu*STAR: A Modular Accelerator-Driven Subcritical Reactor Design	site, neutron, operation, SRF	3555
	R.P. Johnson, R.J. Abrams, M.A. Cummings, J.D. Lobo, M. Popovic, T.J. Roberts Muons, Inc, Illinois, USA
	MuSTAR is an accelerator-driven molten-salt sub-critical reactor based on recent superconducting RF technological breakthroughs that allow a highly efficient and powerful proton accelerator to drive a spallation target inside a graphite-moderated, thermal-spectrum reactor. The additional spallation neutrons can be used to overcome the absorption of neutrons by fission products to allow a deeper burn than is possible with critical reactor designs. Simulations have shown that as much as seven times the energy that was extracted from used fuel from light water reactors can be produced by this method before the accelerator demands significant power from the reactor. Once the fuel rods have been converted from oxide ceramics to fluoride salts, in a process that is proliferation resistant (not chemical reprocessing), the fuel can be burned for centuries without increasing its volume while reducing its radio-toxicity. Our 2017 GAIN voucher grant supported studies by ORNL, SRNL, and INL to design and cost a Fuel Processing Plant to convert used nuclear fuel into the molten-salt fuel for MuSTAR. Based on those studies, it seems possible to build Mu*STAR systems on existing sites where used fuel is stored, convert it to fluoride salts, and use it to provide affordable carbon-free electricity for centuries.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP048
About •	paper received ※ 19 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPMP051	Development of 211-Astatine Production in the Crocker Nuclear Laboratory Cyclotron	cyclotron, operation, proton, extraction	3564
	E. Prebys Fermilab, Batavia, Illinois, USA R.J. Abergel UCB, Berkeley, California, USA W.H. Casey University of California at Davis (UC Davis), Davis, California, USA D.A. Cebra UCD, Davis, California, USA
	There is a great deal of interest in the medical community in the use of the alpha-emitter 211-At as a therapeutic isotope. Among other things, its 7.2 hour half life is long enough to allow for recovery and labeling, but short enough to avoid long term activity in patients. Unfortunately, the only practical technique for its production is to bombard a 209-Bi target with a ~29 MeV alpha beam, so it is not accessible to commercial isotope production facilities, which all use fixed energy proton beams. The US Department of Energy is therefore supporting the development of a "University Isotope Network" (UIN) to satisfy this need. Our prposoal is to retrofit the variable-energy, multi-species cyclotron at the Crocker Nuclear Laboratory at the University of California Davis with an internal Bi-209 target, such that we can put at least 100 uA of 29 MeV alpha particles on target without concerns about extraction efficiency. Using very conservative assumptions, we are confident we will be able to produce 60 mCi of 211-At in solution in an eight hour shift, which includes setup, exposure, and chemical recovery. This poster will cover the design of the target, as well as the required chemical processing and reliability upgrades.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP051
About •	paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPMP052	Recent Progress in R&D for Ionetix Ion-12SC Superconducting Cyclotron for Production of Medical Isotopes	cyclotron, ion-source, controls, cathode	3568
	X. Wu, G.F. Blosser, G.S. Horner, Z.S. Neville, J.M. Paquette, N.R. Usher, J.J. Vincent Ionetix, Lansing, Michigan, USA D.M. Alt NSCL, East Lansing, Michigan, USA
	The Ion-12SC is a sub-compact, 12.5 MeV proton su-perconducting isochronous cyclotron for commercial medical isotope production recently developed at Ionetix Corporation [1]. The machine features a patented cold steel and cryogen-free conduction cooling magnet, a low power internal cold-cathode PIG ion source, and an inter-nal liquid target [2]. It was initially designed to produce N-13 ammonia for dose on-demand cardiology applica-tions but can also be used to produce F-18, Ga-68 and other medical isotopes widely used in Positron Emission Tomography (PET). The 1st engineering prototype was completed and commissioned in September 2015, and four additional units have been completed since [3]. The first two units have been installed and operated at the University of Michigan and MIT. R&D efforts in physics and engineering have continued to improve machine performance, stability and reliability. These improve-ments include: 1) Water cooling added to the dummy dee to limit the operating temperature of the ion source to improve lifetime and performance, 2) Magnetic field maps, obtained with a Hall probe based mapper, were used to accurately measure the isochronism and provide information needed to compensate for any unwanted 1st harmonics and 3) Feedback based control methods ap-plied to regulate the beam intensity on target by adjusting the ion source cathode current. The C1 unit installed at the University of Michigan Medical School early this year treated ~100 patients/month with N-13 ammonia. The machines are now capable of routinely producing > 21 doses/day with > 99% availability. The Ionetix manu-facturing facility is capable of producing up to 30 ma-chines per year.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP052
About •	paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019
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THPGW001	Design of LhARA - Laser Hybrid Accelerator for Radiobiological Applications	proton, laser, focusing, experiment	3578
	J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom O. Ettlinger, C. Hunt, A. Kurup, K.R. Long, Z. Najmudin, J.K. Pozimski Imperial College of Science and Technology, Department of Physics, London, United Kingdom H.T. Lau EBG MedAustron, Wr. Neustadt, Austria
	Recent developments of using lasers interacting with targets for the creation of ion beams offer a possibility to provide beams for radiobiology research. This research aims to precisely study the radiobiological effectiveness of charged particles on various cultures of cells, which is essential to inform next generation hadron therapy treat-ment plans. The Laser hybrid Accelerator for Radiobio-logical Applications (LhARA) has been proposed to use a laser driven beam, which will be captured and focused using Gabor Lenses. The beam will be then energy and momentum selected to create a beam for in-vitro cells studies or sent to a post-accelerator ring to create beam for in-vivo studies. The optical design of LhARA is pre-sented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW001
About •	paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019
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THPGW040	Decay Muon Beamline Design for EMuS	proton, solenoid, simulation, dipole	3670
	Y.P. Song, Y. Bao, C. Meng, J.Y. Tang IHEP, Beijing, People’s Republic of China Y.K. Chen, H.T. Jing IHEP CSNS, Guangdong Province, People’s Republic of China
	Funding: This work is supported by the Chinese Academy of Sciences. The beamline design philosophies and simulation re-sults of the decay muon on Experimental Muon Source (EMuS) are reported in this paper. The beamline is com-posed of solenoids to keep large acceptance, and has been optimized for 45, 150 and 450 MeV/c decay muon re-spectively according to the π spectra optimization results from target station. Decay muons from 45 to 150 MeV/c are designed for μSR applications, and 150 to 450 MeV/c are designed for muon imaging, which is unique on the high momentum perspective. Negative muons from 45 to 150 MeV/c are designed for muonic applications. The momentum range of decay muon is tuneable between 45 and 450 MeV/c.

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MOZPLS2

Ion Collider Precision Measurements With Different Species

operation, electron, experiment, collider

28

G.J. Marr, E.N. Beebe, I. Blackler, W. Christie, K.A. Drees, P.S. Dyer, A.V. Fedotov, W. Fischer, C.J. Gardner, H. Huang, T. Kanesue, N.A. Kling, V. Litvinenko, C. Liu, Y. Luo, D. Maffei, B. Martin, A. Marusic, K. Mernick, M.G. Minty, C. Naylor, M. Okamura, I. Pinayev, G. Robert-Demolaize, T. Roser, P. Sampson, V. Schoefer, T.C. Shrey, D. Steski, P. Thieberger, J.E. Tuozzolo, K. Zeno, I.Y. Zhang
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.
Precedent to electron cooling commissioning and collisions of Gold at various energies at RHIC in 2018, the STAR experiment desired an exploration of the chiral magnetic effect in the quark gluon plasma (QGP) with an isobar run, utilizing Ruthenium and Zirconium. Colliding Zr-96 with Zr-96 and Ru-96 with Ru-96 create the same QGP but in a different magnetic field due to the different charges of the Zr (Z=40) and Ru (Z=44) ions. Since the charge difference is only 10%, the experimental program requires exacting store conditions for both ions. These systematic error concerns presented new challenges for the Collider, including frequent reconfiguration of the Collider for the different ion species, and maintaining level amounts of instantaneous and integrated luminosity between two species. Moreover, making beams of Zr-96 and Ru-96 is challenging since the natural abundances of these isotopes are low. Creating viable enriched source material for Zr-96 required assistance processing from RIKEN, while Ru-96 was provided by a new enrichment facility under commissioning at Oak Ridge National Laboratory.

Slides MOZPLS2 [4.758 MB]

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paper received ※ 11 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOZZPLM3

Commissioning and First Results of the Fermilab Muon Campus

experiment, positron, proton, MMI

41

D. Stratakis, B.E. Drendel, J.P. Morgan, M.J. Syphers
Fermilab, Batavia, Illinois, USA
N.S. Froemming
CENPA, Seattle, Washington, USA
M.J. Syphers
Northern Illinois University, DeKalb, Illinois, USA

In the following years, the Fermilab Muon Campus will deliver highly polarized muon beams to the Muon g-2 Experiment. The Muon Campus contains a target section wherein secondaries are produced, the delivery ring which separates the muons from the rest of the beam and a sequence of beamlines that transports them to the Muon g-2 storage ring. Here, we report the first results of beam measurements at the Muon Campus with emphasis on the key achievements that have contributed to the successful beam delivery to the Muon g-2 Experiment. These achievements include the production of an intense secondary beam from the target, it’s transport over 2 km, the successful monitoring of muons from the available diagnostics and the development of techniques for measuring the transverse optics. We also present detailed comparisons between experimental data and simulation and discuss the similarities and differences observed.

Slides MOZZPLM3 [2.846 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOZZPLM3

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paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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MOZZPLS2

Positron Driven Muon Source for a Muon Collider: Recent Developments

emittance, damping, collider, positron

49

M.E. Biagini, M. Antonelli, O.R. Blanco-García, M. Boscolo, A. Ciarma, A. Giribono, S. Guiducci, C. Vaccarezza, A. Variola
INFN/LNF, Frascati, Italy
A. Bacci
INFN-Milano, Milano, Italy
M. Bauce, F. Collamati
INFN-Roma1, Rome, Italy
G. Cesarini
INFN-Roma, Roma, Italy
I. Chaikovska, R. Chehab
LAL, Orsay, France
S.M. Liuzzo, P. Raimondi
ESRF, Grenoble, France
D. Lucchesi
Univ. degli Studi di Padova, Padova, Italy
N. Pastrone
INFN-Torino, Torino, Italy

The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. The Low Emittance Muon Accelerator (LEMMA) concept *,** presents in this paper an upgraded layout of a positron driven muon source. The positron beam, stored in a ring with high energy acceptance and low emittance, is extracted and driven in a push-pull configuration to a multi-target system, to produce muon pairs at threshold on the target’s electrons. This solution alleviates the issues related to the power deposited and the integrated Peak Energy Density Deposition on the targets. Muons produced in the multi-target system will then be accumulated in many parallel rings before acceleration and injection in the collider. A special multi-target line lattice has been designed to cope with the focusing of both the positron and muon beams. Studies on the number, material and thickness of the targets have been carried out. A general layout of the overall scheme and a description is presented, as well as plans for future R&D.
* M. Antonelli, P. Raimondi, INFN-13-22/LNF, 2013
** M. Boscolo, M. Antonelli, O.R. Blanco-Garcia, S. Guiducci, S. Liuzzo, P. Raimondi, F. Collamati, Phys. Rev. Accel. Beams, vol. 21, p. 061005, 2018

Slides MOZZPLS2 [4.360 MB]

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MOPGW011

Field-map and Beam Transport Calculations of the Magnetic Separator at ALTO Facility at Orsay

dipole, ISOL, ion-source, experiment

86

L. Perrot, R. Ollier
IPN, Orsay, France

The Institute of Nuclear Physics at Orsay (IPN-Orsay) has always been a major player in building accelerators for nuclear physics. The ALTO facility is powered by a 50 MeV/10μA linear electron accelerator dedicated to the production of radioactive beams. The production mode is based on the photo-fission process of a thick UCx target heated up to 2000°C and using the ISOL technique. For the ionization of the released fission fragments, three ion source types can be coupled to the target: Febiad ion source, surface ion source, and laser ion source. The facility can deliver the radioactive ions beams to six different experimental set-ups. The mono-charged RIB exiting from the source must be separated using a magnetic dipole in order to select a nucleus before its transmission through electrostatic devices up to the experimental set-ups. This paper is focus on the separator which was build and exploited with success since 40 years. We propose to revisit this dipole with a precise field-map calculation and particles transport simulations. These results will be use as a first brick of the understanding and reliability of the transmission along the RIB lines at the ALTO facility.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW011

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paper received ※ 19 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019

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MOPGW023

An Algorithm for Automated Lattice Design of Transfer Lines

quadrupole, lattice, focusing, dipole

127

S. Reimann, M. Droba, O. Meusel, H. Podlech
IAP, Frankfurt am Main, Germany

Since the last 20 years, modern heuristic algorithms and machine learning have been increasingly used for several purposes in accelerator technology and physics. Since computing power has become less and less of a limiting factor, these tools have become part of the physicist community’s standard toolkit. This paper describes the construction of an algorithm that can be used to generate an optimised lattice design for transfer lines under the consideration of restrictions that usually limit design options in reality. The developed algorithm has been applied to the existing SIS18 to HADES transfer line in GSI.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW023

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paper received ※ 28 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019

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MOPGW026

Transfer Line Optics Design Using Machine Learning Techniques

simulation, quadrupole, optics, operation

139

D.M. Vilsmeier
IAP, Frankfurt am Main, Germany
M. Bai, M. Sapinski
GSI, Darmstadt, Germany

Optimization of transfer line optics is essential for delivering high quality beams to the experimental areas. This type of optimization is usually done by hand and relies on the experience of operators. The nature of this task is repetitive though highly complex. Besides optimizing the beam quality at the experiments this task is often accompanied by secondary objectives or requirements such as keeping the beam losses below an acceptable threshold. In the past years Deep Learning algorithms have experienced a rapid development and gave rise to various advanced software implementations which allow for straightforward usage of corresponding techniques, such as automatic differentiation and gradient backpropagation. We investigate the applicability and performance of these techniques in the field of transfer line optics optimization, specifically for the HADES beamline at GSI, in form of gradient-based differentiable simulators. We test our setup on results obtained from MADX simulations and compare our findings to different gradient-free optimization methods. Successfully employing such methods relieves operators from the tedious optimization tasks.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW026

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paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPGW041

Transverse Profile Shaping of a Charged-Particle Beam using Multipole Magnets - Formation of Hollow Beams -

octupole, optics, multipole, radiation

184

Y. Yuri, T. Yuyama
QST/Takasaki, Takasaki, Japan
M. Fukuda
RCNP, Osaka, Japan

The use of multipole magnets enables us to shape the transverse profile of a charged-particle beam into various ones that can never be realized through linear beam optics. To date, the formation of a large-area beam with a uniform transverse intensity distribution has been actually realized using octupole magnets in several accelerator facilities. In this presentation, we demonstrate the formation of different beam profiles using multipole magnets rather than existing rectangular uniform beams. Results of tracking simulations and beam-formation experiments will be shown on the formation of clear-cut beams with different cross-sectional shapes, depending on the order and strength of applied multipole magnets. The dynamic behavior of a beam focused with multipole magnets is also investigated theoretically to better understand the numerical and experimental results.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW041

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paper received ※ 19 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPGW046

Proton Beam Steering for the Experimental Muon Source at CSNS

proton, solenoid, extraction, neutron

193

Y.K. Chen, H.T. Jing
IHEP CSNS, Guangdong Province, People’s Republic of China
C. Meng, Y.P. Song, J.Y. Tang, G. Zhao
IHEP, Beijing, People’s Republic of China

Experimental Muon Source (EMuS) is a muon source to be built at China Spallation Neutron Source (CSNS). The EMuS baseline design adopts a stand-alone target sitting in capture superconducting solenoids, and the muon beam is extracted in the forward direction. In the same time the spent protons are also extracted from the target station and guided to an external. Because there is an angle of 15 degrees between the axis of solenoids and the proton direction, the protons will be deviated by the solenoid field. A pair of correction magnets in front of the solenoids is used to align the incoming proton beam to the target and also guide the spent protons to the beam dump. As the target station is design to work at different field level, this increases the complexity of the proton beam transport.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPGW046

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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MOPGW060

Cherenkov Radiation at Off-Axis Bunch Passage Through Dielectric Concentrator

radiation, diagnostics, site, polarization

225

S.N. Galyamin, A.V. Tyukhtin, V.V. Vorobev
Saint Petersburg State University, Saint Petersburg, Russia

Funding: Work supported by the Grant from Russian Foundation for Basic Research (No. 17-52-04107).
Development of tunable systems for non-invasive bunch diagnostics is a modern trend in accelerator physics. Certain dielectric targets are considered in this context, for example, dielectric cones or prisms. Moreover, all-dielectric target which increase the radiated Cherenkov field near the predetermined focus up to several orders of magnitude has been described* and field near its focus and sensitivity of this target have been analyzed**. Here we consider a non-symmetrical case where charge trajectory has a shift with respect to structure axis. We develop analytical approach for description of Cherenkov radiation, perform three-dimensional simulations and compare the results.
* S.N. Galyamin and A.V. Tyukhtin, Phys. Rev. Lett., 113, 064802 (2014).
** S.N. Galyamin and A.V. Tyukhtin, Nucl. Instr. Meth. Phys. Res. B. 2017. V. 402. P.185-189.

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paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPGW069

Recent Beam Performance Achievements with the Pb-Ion Beam in the SPS for LHC Physics Runs

injection, optics, luminosity, flattop

250

H. Bartosik, R. Alemany-Fernández, T. Argyropoulos, T. Bohl, H. Damerau, V. Kain, G. Papotti, G. Rumolo, A. Saá Hernández, E.N. Shaposhnikova
CERN, Meyrin, Switzerland

In the SPS, which is the last accelerator in the LHC ion injector chain, multiple injections of the Pb-ion beam have to be accumulated. On this injection plateau the beam suffers from considerable degradation such as emittance growth and losses. This paper summarises the achievements on improving the beam parameters and maximising the performance of the Pb-ion beam for the LHC physics run in 2018. The results are discussed in view of the target beam parameters of the LHC injectors upgrade project, which is being deployed during the presently ongoing long shutdown.

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paper received ※ 12 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019

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MOPGW072

Reconfiguration of SPS Landau Octupole Circuits to Minimise Second Order Chromaticity

octupole, optics, operation, acceleration

262

H. Bartosik, M. Carlà, K. Cornelis
CERN, Meyrin, Switzerland

In the SPS Q20 optics presently used for LHC beams, the Landau octupole families of the SPS (LOF and LOD circuits) generate large second order chromaticity due to the relatively high dispersion at their locations. Since the induced second order chromaticity results in enhanced losses due to the large incoherent tune spread, these octupoles cannot be used for mitigating transverse instabilities for LHC beams. A new cabling scheme was proposed, exploiting additional octupoles that were already installed in the machine but not used, which allows minimizing the induced second order chromaticity in both the Q20 optics used for LHC beams, as well as the original SPS optics used for fixed target beams. This paper summarises the optics calculations as well as the experimental verification of the reduced chromatic detuning of the new octupole scheme.

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paper received ※ 12 May 2019 paper accepted ※ 17 May 2019 issue date ※ 21 June 2019

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MOPMP003

Positron Source for FCC-ee

positron, linac, electron, collider

424

I. Chaikovska, R. Chehab, A. Faus-Golfe, Y. Han
LAL, Orsay, France
A. Apyan
ANSL, Yerevan, Armenia
Y. Enomoto, K. Furukawa, T. Kamitani, F. Miyahara, M. Satoh, Y. Seimiya, T. Suwada
KEK, Ibaraki, Japan
P.V. Martyshkin
BINP SB RAS, Novosibirsk, Russia
S. Ogur, K. Oide, Y. Papaphilippou, L. Rinolfi, P. Sievers, F. Zimmermann
CERN, Geneva, Switzerland

The FCC-ee is a high-luminosity, high-precision circular collider to be constructed in a new 100 km tunnel in the Geneva area. The physics case is well established and the FCC-ee operation is foreseen at 91 GeV (Z-pole), 160 GeV (W pair production threshold), 240 GeV (Higgs resonance) and 365 GeV (t-tbar threshold). Due to the large 6D production emittance and important thermal load in the production target, the positron injector, in particular the positron source, is one of the key elements of the FCC-ee, requiring special attention. To ensure high reliability of the positron source, conventional and hybrid targets are currently under study. The final choice of the positron target will be made based on the estimated performances. In this framework, we present a preliminary design of the FCC-ee positron source, with detailed simulation studies of positron production, capture and primary acceleration.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP003

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paper received ※ 03 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPMP005

Field Quality for the Hadron Option of Future Circular Collider

injection, dipole, octupole, collider

4397

B. Dalena, D. Boutin
CEA-IRFU, Gif-sur-Yvette, France
A. Chancé
CEA-DRF-IRFU, France
E. Cruz Alaniz
The University of Liverpool, Liverpool, United Kingdom
D. Schulte
CERN, Meyrin, Switzerland

Funding: This Research and Innovation Action project submitted to call H₂020-INFRADEV-1-2014-1 receives funding from the European Union’s H₂020 Framework Program under grant agreement No. 654305.
The updated field quality for the baseline design option of the Nb₃Sn dipoles for Future Circular Collider (FCC-hh) is discussed. The impact on the expected dynamic aperture is shown at injection and collision energy and the consequent non-linear correction schemes together with their integration in the optics are defined.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPMP005

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paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPMP013

New Nuclotron Beam Lines and Stations for Applied Researches

radiation, dipole, heavy-ion, diagnostics

449

E. Syresin, A.A. Baldin, A.V. Butenko, G.A. Filatov, A.A. Slivin, G.N. Timoshenko, G.V. Trubnikov, A. Tuzikov
JINR, Dubna, Moscow Region, Russia
D.V. Bobrovskiy, A.I. Chumakov
MEPhI, Moscow, Russia
M.M. Kats, T. Kulevoy, D.A. Liakin, Y.E. Titarenko
ITEP, Moscow, Russia

New beamlines for applied researches on the Nuclotron are under development within the framework of implementation of the NICA accelerator facility. Ion beams with energies of 150-800 MeV/n extracted from the Nuclotron will be used for radiobiological researches and modeling of cosmic rays interactions with microchips. Equipment of two experimental stations is under development by the JINR-ITEP-MEPhi collaboration for these applied researches. Ion beams with the energy of 3.2 MeV/n extracted from the heavy ion linac HILAc will also be used for irradiation and testing of microchips. The specialized channel will be reconstructed for investigations in the field of relativistic nuclear power at light ion energies of 0.3-4.5 GeV/n. Three new experimental areas are organized for applied physics researches within the framework of implementation of the NICA accelerator facility.

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paper received ※ 29 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPRB003

Multi-Target Lattice for Muon Production From e⁺ Beam Annihilation on Target

positron, emittance, lattice, site

578

O.R. Blanco-García
LAL, Orsay, France
M. Antonelli, M.E. Biagini, M. Boscolo, A. Ciarma, S. Guiducci, C. Vaccarezza, A. Variola
INFN/LNF, Frascati, Italy
G. Cesarini
INFN-Roma, Roma, Italy
F. Collamati
INFN-Roma1, Rome, Italy
R. Li Voti
Sapienza University of Rome, Rome, Italy
P. Raimondi
ESRF, Grenoble, France

The Low Emittance Muon Accelerator~(LEMMA) aims at producing small emittance muons from positron annihilation with electrons in a target. Given the low cross section of the production process, a large number of positrons on the target are required, exposing it to high power deposition and the beam to large degradation because of multiple scattering and bremstrahlung. A multi-target IP, and multi-IP line has been studied to reduce the power deposition per target and the degradation of the positron beam while preserving the number of muon pairs produced. The lattice copes with the focusing and transport of three beams at two different energies, the positron beam at 45 GeV, and µ⁺+ and µ⁻ beams at 22.5~GeV. Studies on the beam dynamics, number of targets, material and thickness of the targets are reported in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB003

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paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPRB004

The European Spallation Source Neutrino Super Beam Design Study

proton, linac, neutron, detector

582

M. Dracos, E. Bouquerel
IPHC, Strasbourg Cedex 2, France
G. Fanourakis
Institute of Nuclear and Particle Physics, Attiki, Greece
G. Gokbulut, A. Kayis Topaksu
Cukurova University, Adana, Turkey

Funding: This project is supported by the COST Action CA15139 EuroNuNet. It has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.
The discovery of oscillations and the latest progress in neutrino physics will make possible to observe for the first time a possible CP violation at the level of leptons. This will help to understand the disappearance of antimatter in the Universe. The ESSnuSB* project proposes to use the proton linac of the ESS currently under construction to produce a very intense neutrino Super Beam, in parallel with the spallation neutron production. The ESS linac is expected to deliver 5 MW average power, 2 GeV proton beam, with a rate of 14 Hz and pulse duration of 2.86 ms. By doubling the pulse rate, 5 MW power more can be provided for the production of the neutrino beam. In order to shorten the proton pulse duration to few μs requested by the neutrino facility, an accumulation ring is needed, imposing the use and acceleration of H⁻ instead of protons in the linac. The neutrino facility also needs a separate target station with a different design than the one of the neutron facility. On top of the target, a hadron magnetic collecting device is needed in order to focus the emerging hadrons from the target and obtain an intense neutrino beam directed towards the neutrino detector.
A Very Intense Neutrino Super Beam Experiment for Leptonic CP Violation Discovery based on the European Spallation Source Linac, Nuclear Physics B, Vol 885, Aug 2014, 127-149, arXiv:1309.7022.

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paper received ※ 10 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPRB019

Beam Optics Study on FFA-MERIT Ring

injection, proton, betatron, acceleration

613

H. Okita, Y. Ishi, Y. Kuriyama, Y. Mori, Y. Ono, A. Taniguchi, T. Uesugi
Kyoto University, Research Reactor Institute, Osaka, Japan
N. Ikeda, Y. Yonemura
Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka, Japan
M. Kinsho, K. Okabe, M. Yoshimoto
JAEA/J-PARC, Tokai-mura, Japan
Y. Miyake
KEK, Tokai, Ibaraki, Japan
M. Muto
New Affiliation Request Pending, -TBS-, Unknown
A. Sato
Osaka University, Osaka, Japan

Funding: This work was funded by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).
Intense negative muon source MERIT (Multiplex Energy Recovery Internal Target) for the nuclear transformation to mitigate the long lived fission products from nuclear plants has been proposed. For the purpose of proof-of-principle of MERIT scheme, FFA ring has been developed. The results of beam optics study for MERIT ring will be reported in this conference.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB019

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paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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MOPRB021

Remodeling of 150 MeV FFAG Main Ring at KURNS to Pion Production Ring

FFAG, proton, focusing, resonance

616

K. Suga, Y. Fuwa, Y. Ishi, Y. Kuriyama, Y. Mori, H. Okita, T. Uesugi
Kyoto University, Research Reactor Institute, Osaka, Japan

A possibility of remodeling main ring of 150 MeV FFAG accelerator at Kyoto University, Institute for Integrated Radiation and Nuclear Science (KURNS) to Pion Production Ring (PPR) for muon transmutation study has been discussed. Design was made on the assumption that 400 MeV proton beams circulate and hit a target in the ring to generate pions. Optimizations of lattice parameters and 3D magnet modeling are reported.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB021

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paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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MOPRB026

High-Quality Muon Beam Production Based on Superconducting Solenoids

proton, polarization, experiment, solenoid

630

Y. Bao, X. Li, Y. Li, Y.P. Song, X. Tong
IHEP, Beijing, People’s Republic of China

Funding: This work is supported by the Science Foundation of The Chinese Academy of Sciences and National Natural Science Foundation of China (No. 11875281)
In labs, muon beams are produced by protons hitting targets. The initial phase space of the muon beam is extremely large. In general, two types of muon collection methods have been used in the world. One is to put the muon production target in a superconducting solenoid, and low-energy muons are collected from the back of the target, then transported through a bent solenoid. In this way, a high-intensity muon beam can be collected, but the energy spread is wide and the beam polarization is low. For most muSR applications a surface muon beam with narrow energy bite and high polarization is required. Most muSR facilities are built with collecting magnets by the side of the target, in this way only a small fraction of muons with low emittance are collected and transported downstream. In this work we outline a muon collection method based on superconducting solenoid. Instead of using bent solenoids, a matching section with a dipole magnet is used to select muons with a certain momentum and match to downstream beamliines. A high-quality muon beam can be achieved with a high intensity and polarization. Such a method can be adapted to the MUSIC, Mu2e, and COMET muon beamlines after their dedicate experiments and convert the beamlines into a high quality muSR facility.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB026

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paper received ※ 30 April 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPRB028

Application of WCM in Beam Commissioning of RCS in CSNS

proton, neutron, bunching, MMI

636

M.T. Li, F. Li
IHEP CSNS, Guangdong Province, People’s Republic of China
Y.W. An, S.Y. Xu, T.G. Xu
IHEP, Beijing, People’s Republic of China

Wall Current Monitor (WCM) is the only beam instru-ment in RCS of CSNS. It is utilized to derive many kinds of physics parameters during beam commissioning. The longitudinal phase distribution of the bunch over the boosting time is deduced for our future analyzation.

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paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPRB046

Status of the ESSnuSB Accumulator Design

linac, space-charge, injection, simulation

666

Y. Zou, T.J.C. Ekelöf, M. Olvegård, R.J.M.Y. Ruber
Uppsala University, Uppsala, Sweden
E. Bouquerel, M. Dracos
IPHC, Strasbourg Cedex 2, France
M. Eshraqi, B. Gålnander
ESS, Lund, Sweden
H.O. Schönauer, E.H.M. Wildner
CERN, Geneva, Switzerland

Funding: This project is supported by the COST Action CA15139 EuroNuNet. It has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.
The 2.0 GeV, 5 MW proton linac for the European Spallation Source, ESS, will have the capacity to accelerate additional pulses and send them to a neutrino target, providing an excellent opportunity to produce an unprecedented high performance neutrino beam, the ESS neutrino Super Beam, ESSnuSB, to measure, with precision, the CP violating phase at the 2nd oscillation maximum. In order to comply with the acceptance of the target and horn systems that will form the neutrino super beam, the long pulses from the linac must be compressed by about three orders of magnitude with minimal particle loss, something that will be achieved through multi-turn charge-exchange injection in an accumulator ring. This ring will accommodate over 2·10¹⁴ protons, which means that several design challenges are encountered. Strong space charge forces, low-loss injection with phase space painting, efficient collimation, a reliable charge stripping system, and e-p instabilities are some of the important aspects central to the design work. This paper presents the status of the accumulator ring design, with multi-particle simulations of the injections procedure.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB046

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paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPRB049

Study of Beam-Gas Interactions at the LHC for the Physics Beyond Colliders Fixed-Target Study

proton, collider, experiment, simulation

673

C. Boscolo Meneguolo, R. Bruce, F. Cerutti, M. Ferro-Luzzi, M. Giovannozzi, A. Mereghetti, J. Molson, S. Redaelli
CERN, Geneva, Switzerland
A. Abramov
JAI, Egham, Surrey, United Kingdom

Among several working groups formed in the framework of Physics Beyond Colliders study, launched at CERN in September 2016, there is one investigating specific fixed-target experiment proposals. Of particular interest is the study of high-density unpolarized or polarized gas target to be installed in the LHCb detector, using storage cells to enhance the target density. This work studies the impact of the interactions of 7 TeV proton beams with such gas targets on the LHC machine in terms of particle losses.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB049

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paper received ※ 17 April 2019 paper accepted ※ 19 May 2019 issue date ※ 21 June 2019

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MOPRB104

A Parameter Study for Improving the Performance of the Production Target for the Fermilab Muon g-2 Experiment

simulation, experiment, storage-ring, proton

806

D. Stratakis
Fermilab, Batavia, Illinois, USA

The target station of the Muon g-2 Experiment is one of the central pieces for the production of secondary pions which eventually will decay to the desired mu-ons. In this paper, we report adjustments made to opti-mize its performance. For instance, in the simulation we vary the size of the primary incoming beam and examine its impact on the downstream production. We then compare this with the actual measured beam size upstream of the target. In addition, we examine the sensitivity in performance with the strength of the lithium lens for pion capture and the distance between lens and target. We compare measured data with simu-lation results.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPRB104

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paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPTS043

ESS Related Activities at Elettra Sincrotrone Trieste

quadrupole, linac, dipole, MMI

953

A. Fabris, D. Caiazza, D. Castronovo, M. Cautero, S. Cleva, R. De Monte, R. Fabris, M. Ferianis, A. Gubertini, T.N. Gucin, R. Laghi, G. Loda, C. Pasotti, R. Visintini, S. Grulja
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Elettra Sincrotrone Trieste Research Center (Elettra) is one the Italian Institutions, together with Istituto Nazionale di Fisica Nucleare (INFN) and Consiglio Nazionale delle Ricerche (CNR), committed to the realization of the Italian in-kind contributions for the European Spallation Source. Elettra contributions are concentrated on the proton accelerator and more specifically they concern the construction of the conventional iron-dominated electro-magnets and related power converters to be installed in the superconducting part of the linac and in the High Energy Beam Transport (HEBT), the RF power stations for the superconducting spoke cavity linac section and the wire scanner acquisition system for the beam diagnostics. This paper provides a description of the contributions and an overview of the status of the construction activities.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS043

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paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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MOPTS081

Design of the Transferline to the ESS Target and Beam Dump at Reduced Beam Energy

linac, quadrupole, ECR, ion-source

1034

Y.S. Qin, M. Eshraqi, Y. Levinsen, R. Miyamoto
ESS, Lund, Sweden

The European Spallation Source (ESS) linac transfer-lines to the target and beam dump are designed for the 2 GeV beam energy. The commissioning and operation of the accelerator will start at a reduced energy of 571 MeV with the high beta part of the linac unpowered. The beam power at this energy is still above 1 MW and a proper transport from the last accelerating cavity to the target is essential. Beam dynamics design of the High Energy Beam Transport (HEBT) and Accelerator to Target (A2T) are studied based on this reduced energy in this paper, including phase advance optimization and rematch. Among the factors which are analyzed are the envelope and beam size on the target which are kept close to their values at 2 GeV and losses along the linac and the transfer lines.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-MOPTS081

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paper received ※ 10 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUXXPLS2

Negative Muonium Ion Production With a C12A7 Electride Film

experiment, positron, acceleration, electron

1175

M. Otani, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, K. Shimomura, T. Yamazaki
KEK, Tsukuba, Japan
K. Hasegawa, Y. Kondo, T. Morishita
JAEA/J-PARC, Tokai-mura, Japan
T. Iijima, Y. Sue
Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
H. Iinuma, Y. Nakazawa
Ibaraki University, Ibaraki, Japan
K. Inami, M. Yotsuzuka
Nagoya University, Nagoya, Japan
K. Ishida
RIKEN Nishina Center, Wako, Japan
R. Kitamura, H.Y. Yasuda
University of Tokyo, Tokyo, Japan
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Funding: This work was supported by OSPS KAKENHI Grant Numbers JP15H03666, JP 16H03987, JP18H03707.
Negative muonium ion production is one of methods to cool muons. Since its discovery in 1987 by interactions of muons with a metal foil, it has been discussed that the production efficiency would be improved using a low-work function material. C12A7 (12CaO·7AlO3) was a well-known insulator as a constituent of alumina cement, but was recently confirmed to exhibit electric conductivity by electron doping. The C12A7 electride has lower work function (2.9 eV) and it was reported that nearly the same negative current signal as that with a bi-alkali material coated metal were observed in H⁻ formation. In this poster, the negative muonium production measurement with a Al foil and C12A7 electride film will be presented.

Slides TUXXPLS2 [2.680 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUXXPLS2

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP003

Development of Remote Handleable Axially Decoupled Radiation Resistant Vacuum Seal

vacuum, interface, operation, electron

1233

R.R. Nagimov, Y. Bylinskii, L. Egoriti, A. Gottberg, G.W. Hodgson, A.N. Koveshnikov, D. Yosifov
TRIUMF, Vancouver, Canada

Funding: ARIEL is funded by the Canada Foundation for Innovation (CFI), the Provinces of AB, BC, MA, ON, QC, and TRIUMF. TRIUMF receives federal funding via a contribution agreement with the NRC of Canada.
Advanced Rare IsotopE Laboratory (ARIEL) facility is a major expansion of TRIUMF’s rare isotope research program. Aiming to triple the production of rare isotopes, ARIEL facility includes the new electron linac driver and two target stations for electron and proton beams. Particularities of ARIEL target stations design define the requirements for vacuum interfaces with both primary electron and proton beamlines and rare-isotope beamlines. None of the existing products fully met the requirements, driving the development of custom vacuum interfaces. The design of new vacuum seals is driven both by unique design specifications (limited amount of allowed axial forces, extreme radiation resistance, remote handleability and high repeatability) as well as limitations of the proposed design of beamline infrastructure in the target hall (limited available space and the choice of materials for certain components). This paper discusses preliminary results of the vacuum seal development and presents first results of prototype testing.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP003

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP017

Design of Scanning Magnet Power Supply for HUST-PTF

power-supply, controls, proton, simulation

1269

X.Y. Li, Y.Y. Hu, Y.J. Lin, P. Tan, X.D. Tu, Y.C. Yu, L.G. Zhang, Z.Q. Zhang
HUST, Wuhan, People’s Republic of China

An active scanning proton therapy facility is being de-veloped at Huazhong University of Science and Technol-ogy（HUST）. By controlling the deflection position of the beam with scanning magnets at different times, the superposition of discrete spot beams will form a specified shape and dose distribution conformal to the target tu-mour. A high precision and fast response power supply is required to deflect the beam quickly and accurately. In this paper, the TOSCA module in Opera3D is used to model and simulate the scanning magnets and to obtain the equivalent inductance of the magnet. Then the calcu-lated equivalent resistance inductance instead of the magnet is used to design the scanning magnet power supply. A high-voltage bridge is utilized to achieve fast response speed, and a low voltage bridge and PI control algorithm is adopted to ensure power supply accuracy. The Simulation result shows that the designed power supply meets the requirements of response speed and accuracy.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP017

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP021

Comparison of TiZrV Non-evaporable Getter Films Deposited by DC Magnetron Sputtering or Quantitative Deposition

vacuum, site, interface, electron

1283

X.Q. Ge, W. Li, J.Q. Shao, S. Wang, Y.G. Wang, Y. Wang, W. Wei, B. Zhang, Y.X. Zhang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

Ti-Zr-V non-evaporable getter (NEG) films have been widely used in vacuum chambers of various accelerators since their discovery. Recently, we have used a new method called ’quantitative deposition’ to deposit Ti-Zr-V NEG films on nichrome substrates. The surface morphology and surface chemical bonding information were collected by scanning electron microscopy. Although the film deposited by DC magnetron sputtering has more uniform grain growth, smoother grain boundaries and higher porosity, the two films all have porous network structure and can be used as getter films.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP021

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paper received ※ 24 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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TUPMP033

Design of the Neutron Imaging Differential Pumping Line at LLNL

neutron, vacuum, shielding, simulation

1312

J.A. Caggiano, D. Castronovo, P. Fitsos, D.J. Gibson, J. Hall, M.S. Johnson, R.A. Marsh, B. Rusnak
LLNL, Livermore, California, USA

Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
The neutron imaging system at LLNL is a radiographic capability for imaging objects with fast, quasi-monoenergetic neutrons at ≤1mm spatial resolution. The neutron production source is a deuteron beam (4 or 7 MeV) incident upon a rotating, high-pressure, windowless, pure-deuterium gas target. The windowless nature of the target combined with the high pressure leads to significant gas leakage upstream of the neutron production target. This leakage degrades the imaging quality by (1) increasing the depth-of-field blurring and (2) increasing the beam diameter and divergence in the transverse direction via angular straggling in the residual gas. To mitigate these effects, and guided by bench tests and simulations, we designed a differential pumping line (DPL) to ensure the highest quality imaging system. The system consists of three primary stages (chambers), each separated by carefully shaped apertures. These apertures can be long and thin with low-angle tapers due to the high quality of the beam optics (convergence at the target < 5mrad) and low emittance of the beam (~5 pi mm-mrad). The primary cascaded roots pumps are sized to remove >99% of the incoming mass flow in each stage, ensuring that by the third stage furthest from the target, turbomolecular pumps are able to operate in a nominal ~mTorr range. We anticipate full system testing with helium in mid 2019.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP033

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPMP050

Conceptual Design of the Diamond-II Vacuum System

vacuum, photon, storage-ring, controls

1362

M.P. Cox, C. Burrows, A.G. Day, J.A. Dymoke-Bradshaw, R.K. Grant, N.P. Hammond, X. Liu, A.G. Miller, H.S. Shiers, N. Warner
DLS, Oxfordshire, United Kingdom

The conceptual design of the vacuum system for the Diamond-II storage ring upgrade is described. Due to the small vessel cross section, typically 20 mm inside diameter (ID), and the consequent conductance limitation, distributed pumping is provided by non-evaporable getter (NEG) coating supplemented by ion pumps at high gas load locations. In-situ bakeout is incorporated to allow rapid recovery from both planned vacuum interventions and unplanned vacuum events. The vacuum vessels are constructed mainly from copper alloy while stainless steel is used in regions of AC magnets requiring low electrical conductivity. The proposed layout, engineering and build sequence of the vacuum system are described along with gas flow simulations confirming the vacuum performance advantages of NEG-coated vessels compared with uncoated vessels.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPMP050

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPGW038

Study on Coherent THz Radiation Using Tilt Control of Electron Beam

electron, radiation, solenoid, experiment

1489

Y. Tadenuma, M. Brameld, T. Murakami, K. Sakaue, M. Washio
Waseda University, Tokyo, Japan

Funding: This work was supported by a research granted from JSPS KAKENHI 17H02821.
The terahertz wave is located in the intermediate frequency band between radio waves and light waves, and researches on the light sources such as terahertz quantum cascade laser and femtosecond laser based THz sources are being conducted*. As a new terahertz light source, we are studying coherent Cherenkov radiation by using the tilt control of electron beam and irradiating the target medium. Since the radiation intensity of Cherenkov radiation depends on the target medium, comparison of three kinds of medium with different refractive index and density, and optimization of the target shape were performed. In addition, we are going to try quasi monochromatization of radiation by using multi slit to control the form factor of the electron beam. In this presentation, we will report the experimental results of target optimization and quasi monochromatization and the future prospects.
*S. S. Dhillon, et al., The 2017 terahertz science and technology roadmap, J. Phys. D: Appl. Phys., 50 (2017) 043001.

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paper received ※ 12 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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TUPGW086

Energy and RF Cavity Phase Symmetry Enforcement in Multi-Turn ERL Models

cavity, linac, acceleration, electron

1606

R.M. Koscica, N. Banerjee, C.M. Gulliford, G.H. Hoffstaetter, W. Lou
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

In a multi-pass Energy Recovery Linac (ERL), each cavity must regain all energy expended from beam acceleration during beam deceleration, and the beam should achieve specific energy targets during each loop that returns it to the linac. For full energy recovery, and for every returning beam to meet loop energy requirements, we must optimize the phase and voltage of cavity fields in addition to selecting adequate flight times. If we impose symmetry in time and energy during acceleration and deceleration, fewer parameters are needed, simplifying the optimization. As an example, we present symmetric models of the Cornell BNL ERL Test Accelerator (CBETA) with solutions that satisfy the optimization targets of loop energy and zero cavity loading.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-TUPGW086

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paper received ※ 14 May 2019 paper accepted ※ 19 May 2019 issue date ※ 21 June 2019

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TUPTS115

The Progress in Physical Start-Up of the NSC KIPT Subcritical Neutron Source Facility Driven by an Electron Linear Accelerator

neutron, electron, detector, vacuum

2197

P. Gladkikh, O.V. Bykhun, I.M. Karnaukhov, A. Mytsykov, V. Stomin, I. Ushakov, A.Y. Zelinsky
NSC/KIPT, Kharkov, Ukraine

National Science Center ’Kharkov Institute of Physics &Technology’ (NSC KIPT), Kharkov, Ukraine and Argonne National Laboratory (ANL), Chicago, USA are jointly constructing and commissioning the Ukraine Neutron Source facility. The facility consists of a subcritical assembly driven by a 100MeV/100kW electron linear accelerator. The electron beam will be used for generating the neutrons for operating the subcritical assembly using tungsten or natural uranium target. The facility is planned to support the Ukraine nuclear industry, and provide a capability for performing reactor physics, material research, and basic science experiments, to produce medical isotopes, train young nuclear professionals. The integrating facility tests were completed at the end of 2018, and physical start-up operation began in 2019. The facility commissioning and current start-up results are presented and discussed in the paper.

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paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEYYPLS3

Development of Methods for Calculation of Bunch Radiation in Presence of Dielectric Objects

radiation, simulation, vacuum, focusing

2274

A.V. Tyukhtin, E.S. Belonogaya, S.N. Galyamin, V.V. Vorobev
Saint Petersburg State University, Saint Petersburg, Russia

Funding: This work was supported by the Russian Science Foundation (Grant # 18-72-10137).
Radiation of charged particles moving in presence of dielectric targets is of interests for various applications in accelerator and beam physics*. Typically, the size of the target is much larger than the wavelengths under consideration. This fact gives us an obvious small parameter of the problem and allows developing approximate methods of analysis. We develop two methods: "ray-optical method" and "aperture method"**. These methods can be very effective for all situations where we can find the tangential field components on the "aperture" which is an object boundary illuminated by Cherenkov radiation. We apply the aperture method to different dielectric objects including a prism, a cone, and a ball. Electromagnetic field is analyzed on different distances from the objects. The special attention is given to investigation of the field in the far-field (Fraunhofer) area having large importance for various applications. We obtain analytical results for different objects, demonstrate typical radiation patterns and discuss new physical effects, in particular, the phenomenon of concentration of radiation and effect of "Cherenkov spotlight". Prospects of use of aperture method and ray-optical one for other objects are discussed as well.
* R.Kieffer et al, PRL, 121, 054802 (2018).
** E.S.Belonogaya et al, JOSA B, 32, 649 (2015); S.N.Galyamin, A.V.Tyukhtin, PRL, 113, 064802 (2014); A.V.Tyukhtin et al, J. Instrum., 13, C02033 (2018).

Slides WEYYPLS3 [4.063 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEYYPLS3

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paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPMP005

Beam Line Optimization Using Derivative-Free Algorithms

experiment, heavy-ion, site, interface

2307

S. Appel, S. Reimann
GSI, Darmstadt, Germany

The present study focuses on the beam line optimization from the heavy-ion synchrotron SIS18 to the HADES experiment. BOBYQA (Bound Optimization BY Quadratic Approximation) solves bound constrained optimization problems without using derivatives of the objective function. The Bayesian optimization is an other strategy for global optimization of costly, noisy functions without using derivatives. A python programming interface to MADX allow the use of the python implementation of BOBYQA and Bayesian method. This gave the possibility to use tracking simulation with MADX to determine the loss budget for each lattice setting during the optimization and compare both optimization methods.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP005

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paper received ※ 29 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPMP027

Update on Beam Transfer Line Design for the SPS Beam Dump Facility

proton, experiment, quadrupole, extraction

2375

Y. Dutheil, J. Bauche, L.A. Dougherty, M.A. Fraser, B. Goddard, C. Heßler, V. Kain, J. Kurdej, J.A. Uythoven, F.M. Velotti
CERN, Geneva, Switzerland

The SPS Beam Dump Facility (BDF) being studied as part of the Physics Beyond Colliders (PBC) CERN project has recently reached an important milestone with the completion of the comprehensive feasibility study. The BDF is a proposed fixed target facility to be installed in the SPS North Area, to accommodate experiments such as SHiP (Search for Hidden Particles), which is most notably aiming at studying hidden sector particles. This experiment requires a high intensity slowly extracted 400 GeV proton beam with 4·10¹³ protons per 1 s spill to achieve 4·10¹⁹ protons on target per year. The extraction and transport scheme will make use of the first 600 m of the existing North Area extraction line. This contribution presents the status of the design work of the new transfer line and discusses the challenges identified. Aperture studies and failure scenarios are treated and the results discussed. In particular, interlock systems aiming at protecting critical components against the uncontrolled loss of the high energy proton beam are considered. We also present the latest results and implications of the design of a new laminated Lambertson splitter magnet to provide fast switching between the current North Area experiments and the BDF.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP027

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paper received ※ 13 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPMP034

Characterisation of SPS Slow Extraction Spill Quality Degradation

quadrupole, dipole, flattop, extraction

2403

F.M. Velotti, H. Bartosik, M.C.L. Buzio, K. Cornelis, V. Di Capua, M.A. Fraser, B. Goddard, V. Kain
CERN, Meyrin, Switzerland

The main physics users of the Super Proton Synchrotron (SPS) are the experiments installed in the North Area (NA). They are supplied with slowly extracted protons or heavy ions, exploiting a third integer slow extraction to provide a 4.8 s spill. High duty cycle and constant particle flux are the main requirements. Frequent super cycle changes induce variation of the spill macro structure which directly deteriorate the final spill quality. In this paper, the source of such an effect are investigated. Results of both beam based measurements and direct magnetic measurements on the SPS reference magnets are presented. Finally, a possible strategy to counteract this effect is discussed, in order to try to remove the super cycle changes variation as cause for spill quality deterioration.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP034

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paper received ※ 15 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPMP038

Combined MCNP/Turtle Simulation of the SINQ Beam Line at PSI-HIPA

simulation, proton, scattering, optics

2410

D. Reggiani, D.C. Kiselev, M. Seidel, V. Talanov, M. Wohlmuther
PSI, Villigen PSI, Switzerland

With a nominal beam power of nearly 1.4 MW, the PSI High Intensity Proton Accelerator (HIPA) complex is currently at the forefront of the high intensity frontier of particle accelerators. A key issue of such facilities is the minimization of beam losses that could lead to excessive activation of beam line components. At HIPA, the SINQ beam line is particularly subject to relatively large losses since it receives the highly divergent beam scattered off a 40 or 60 mm thick muon production graphite target (TE). So far, for HIPA, beam line simulations have been carried out only by means of the matrix multiplication codes TRANSPORT and TURTLE. Although very efficient, such tools do not allow a precise determination of beam losses whenever targets and collimators are substantially affecting the beam optics. A true understanding of how beam halo and the low momentum tail contribute to the measured losses can only be achieved by complementing the traditional simulations techniques by a tool that can transport beam particles in different materials and, at the same time, handle complex geometries like the ones of collimators situated in the beam line. Moreover, such an improved beam line simulation would give a significant contribution in evaluating the feasibility of the SINQ beam rotation system currently under study. In this paper we present a simulation of the SINQ beam line combining MCNP models of TE and collimator sections with the TURTLE computation of the magnetic channel.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPMP038

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPMP048

Development of Spin Rotator and an Absolute Polarimeter for Polarized He-3 at BNL

dipole, polarization, solenoid, scattering

2440

D. Raparia, G. Atoian, S. Ikeda, R.F. Lambiase, M. Okamura, A. Poblaguev, J. Ritter, S. Trabocchi, A. Zelenski
BNL, Upton, Long Island, New York, USA
R. Milner, M.M. Musgrave
MIT, Cambridge, Massachusetts, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
EBIS Preinjector will provide longitudinally polarized 3He++ ions with about 80% polarization and 5.10¹¹ particles per bunch at 6 MeV, which must be rotated to vertical direction before it ions are injected into the Booster. The 3He++ longitudinal polarization is first rotated to the transverse direction by the 21.5° bending magnet. Then the solenoid spin-rotator rotates the spin to the vertical direction. The spin-rotator will be a pulsed solenoid with a reversible field to enable spin flips. The vertically polarized beam will be returned back to the straight HEBT line by the system of three dipole magnets after the spin rotator solenoid. The low-energy polarimeter can be installed in the straight beam line section after the second dipole magnet. To measure transverse (vertical) polarization of the 3He beam at 5-6 MeV, the spin correlated asymmetry of 3He scattering on a 4He gas target (~5 Torr) will be measured with left/right symmetric strip detectors. Paper will present status of the project.

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paper received ※ 19 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPGW019

Performance of the CVD Diamond Based Beam Quality Monitoring System in the HADES Experiment at GSI*

monitoring, detector, experiment, extraction

2507

A. Rost, T. Galatyuk
TU Darmstadt, Darmstadt, Germany
J. Adamczewski-Musch, S. Linev, J. Pietraszko, M. Sapinski, M. Traxler
GSI, Darmstadt, Germany

Funding: Work supported by the DFG through GRK 2128 and VH-NG-823.
The beam quality monitoring of extracted beams from SIS18 at GSI, transported to the HADES experiment is of great importance to ensure a high efficient data recording. The main detector system used for this purpose is the Start-Veto system which consists of two diamond based sensors made of pcCVD and scCVD diamond materials. Both sensors are equipped with a double-sided strip segmented metallization (300 µm width) which allows a position determination of the beam. Those sensors are able to deliver a time precision <100 ps and can handle rate capabilities up to 10⁷ particles/s/channel. Beside the diamond sensors a plastic scintillation based beam halo detector is used. The read-out of the detectors is based on the TRB3 system*. A 264 channel TDC (Time to Digital Converter) is implemented in FPGA technology with 10 ps precision. The TRB3 system serves as a fast and flexible Data Acquisition System (DAQ) with integrated scaler capability. The analysis and online visualization is performed using the Data Acquisition Backbone Core (DABC)** framework. In this contribution the performance of the system, which was used in order to evaluate an Ar and Ag ion beam delivered by the SIS 18 accelerator, will be discussed.
* A. Neiser et al., JINST 8 (2013) C12043
** J. Adamczewski-Musch et al., J.Phys. Conf. Ser. 664 (2015) no.8, 082027

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPGW022

A Numerical Analysis to Choose the Most Performing Optical Transition Radiation Screen

electron, radiation, brightness, site

2518

F. Cioeta, D. Alesini, A. Variola
INFN/LNF, Frascati (Roma), Italy
M. Ciambrella, A. Mostacci
Sapienza University of Rome, Rome, Italy
D. Cortis, M. Marongiu, V. Pettinacci
INFN-Roma, Roma, Italy

Optical Transition Radiation (OTR) screen represents the most appropriate instrument to measure and verify the characteristics of a beam spot size produced by a particle accelerator. In order to measure such beam properties, OTR screens have to sustain thermal and mechanical stresses due to the energy that several bunches deposit. Owing to these requirements, it is essential to identify the more suitable material to optimize the OTR dimensions and to get reliable measures from the diagnostic system. In this paper, we describe a numerical procedure to choose the most performing material taking into account the physical requirements of a multi-bunch high brightness. The procedure is based on a dedicated ANSYS script able to evaluate the fatigue life time of the material considering a high number of thermal cycles generated by several bunches. The main characteristic of this script is the capability to simulate the real thermal and mechanical effect on the target that the hitting particle beam produces. The numerical procedure has been applied to compare the performance of three relevant materials-Aluminium, Silicon and Graphite simulating a beam hitting with well-known parameters.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW022

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paper received ※ 13 May 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019

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WEPGW030

Beam Profile Monitor for Slow Extracted Beam Using Multi-Layered Graphene at J-PARC

electron, extraction, proton, real-time

2532

Y. Hashimoto, Y. Hori, R. Muto, M. Tomizawa, T. Toyama, M. Uota
KEK, Tokai, Ibaraki, Japan
M. Endo, H. Sakai
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
M. Murakami, K. Murashima, M. Tachibana, A. Tatami
KANEKA, Osaka, Japan

Extracted-beam profiles in slow extraction at J-PARC has been measured by using secondary electrons emitted from a target array made by multi-layered graphen, in real time during spill time of around 2 seconds. The target array consists of 20 ribbons with width of 1 mm, pitch of 2 mm, and thickness of 1.1 micron. Secondary-electron current at each channel is measured by a current amplifier having sensitivity more than 1 pA. These configuration produces useful information for beam dynamics in slow extraction. We have set this monitor at the entrance of a septum magnet, then we can also measure the last few-turns beam with the extracted beam simultaneously. We will discuss about features of this instrument and recent beam study with 51 kW extracted-beams.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW030

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paper received ※ 15 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPGW037

Development of a Dense Gas Sheet Target for a 2D Beam Profile Monitor

electron, experiment, simulation, vacuum

2554

N. Ogiwara, Y. Hori
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
Y. Hikichi, J. Kamiya, M. Kinsho
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
I. Yamada
Doshisha University, Graduate School of Engineering, Kyoto, Japan

We have been developing a dense gas sheet target to realize a non-destructive and fast-response beam profile monitor for the accelerators in J-PARC. The beaming effect in vacuum science and technology has been employed for making a gas sheet. The gas sheet with a thickness of ~ 1 mm and the density of 2 x 10^-4 Pa was successfully obtained. Then, we have successfully measured the profiles of the 400 MeV H⁻ ion beam in J-PARC linac by detecting the ions generated through the collision of this gas sheet to the H⁻ beam. This time, we have developed the gas sheet with the density of more than 10-3 Pa using a circular slit. The details of the new gas sheet generator will be shown.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW037

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paper received ※ 20 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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WEPGW039

Multi-Ribbon Profile Monitor for High Power Proton Beam at J-PARC MR Abort Line

proton, extraction, emittance, electron

2561

K. Sato
The University of Tokyo, Graduate School of Science, Tokyo, Japan
E. Hamada, Y. Hashimoto, S. Igarashi, T. Koseki, Y. Sato
KEK, Tsukuba, Japan

Japan Proton Accelerator Research Complex (J-PARC) Main Ring (MR), the world-class high intensity proton synchrotron, provides proton beam to two experimental facilities with two extraction modes: Fast extraction (FX) and Slow extraction (SX). The number of protons per pulse (ppp) in MR recorded the world highest value of 2.6×10¹⁴ in the FX mode. Now we are planning to increase the ppp further up to 3.3×10¹⁴ in near future. The beam profile is one of the most important parameters to discuss the high intensity beam dynamics in MR. Monitors using multi-wires / ribbons are effective to measure the beam profile with good accuracy and wide dynamic range. However, they cause significant beam losses by interactions with high-intensity circulating beam in synchrotrons. Recently, we installed new multi-ribbon profile monitor (MRPM) in an abort line in MR. The abort line is one of the extracted beam lines of the FX system. It has a quadrupole doublet which is called Abort Q and transports extracted beam to a beam dump. The FX system can extract the circulating beam in MR with an arbitrary energy. Performing the single-pass measurement with MRPM and changing the transfer matrix by sweeping field strength of Abort Q, the emittance of the extracted beam can be measured. In this paper, we present the design, manufacturing, and results of the first beam test of newly installed MRPM system.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW039

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paper received ※ 01 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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WEPGW046

Key Technologies for Remote Detection of CSNS Radiation Environment

vacuum, controls, radiation, operation

2584

L. Kang, R.H. Liu, X.J. Nie, A.X. Wang, G.Y. Wang, D.H. Zhu
IHEP, Beijing, People’s Republic of China
J.X. Chen, H.Y. He, L. Liu, C.J. Ning, J.B. Yu, Y.J. Yu, J.S. Zhang
IHEP CSNS, Guangdong Province, People’s Republic of China

Funding: Work supported by National Nature Science Foundation of China (11375217)
China Spallation Neutron Source (CSNS) has been continuously operating in September 2018. As the operating time increases the radiation dose will also increase, some equipment maintenance and testing must take special tools and equipment. This article mainly introduced the studies on radiation environment of several detection technologies, such as: remote vacuum leak detection methods and equipment, strong magnetic field environment vibration measuring technology, using Qr code tracing machine walking vehicle inspection system and remote image vision measurement technology, etc., these advanced technology also has a guiding significance to other related fields.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW046

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paper received ※ 23 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPGW060

Theoretical Analysis and Experimental Design of Terahertz Single-Pulse Picking based on Plasma Mirror

plasma, laser, electron, FEL

2613

S.Y. Zhao, M. Li, P. Li, J. Wang, D. Wu, X. Yang
CAEP/IAE, Mianyang, Sichuan, People’s Republic of China

Funding: Work supported by National Natural Science Foundation of China with grant (11505173, 11505174, 11575264, and 11605190)
China Academy of Engineering Physics terahertz free electron laser (CTFEL) facility needs a terahertz switch for picking of single-pulse, which can facilitate the experiments that require high peak power but low average power. At present, many researches mainly focus on resonant tunneling effects, tunable metamaterials such as graphene and vanadium dioxide, nonlinear modulation based on the principle of all-optical switching, etc. However, the frequency range of these terahertz switches is generally not applicable to CTFEL(1.87-2.3THz). In this paper, self-induced plasma switching technology is applied to CTFEL. Single-pulse is reflected by a dense plasma in a Ge, Al or fused quartz slab that is photoexcited by laser system. Theoretical analysis and numerical simulation demonstrate the feasibility of the experiment. In addition, schematic layout of the experiment setup and specifications of the major instruments are given.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW060

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paper received ※ 14 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPGW078

Development and Test of a Beam Imaging System Based on Radiation Tolerant Optical Fiber Bundles

radiation, laser, experiment, site

2658

D. Celeste, E. Bravin, S. Burger, F. Roncarolo
CERN, Geneva, Switzerland

Many of the beam image systems at CERN are located in high radiation environments. In order to cope with this issue, VIDICON cameras are presently used but their production has been nowadays discontinued worldwide. The development of an alternative beam imaging system is described here, based on radiation tolerant optical fibre bundles. Such an optical line relays the image of a scintillating screen to a standard CMOS camera, located away from the high radiation zone. A prototype system based on a 10m long bundle with 10⁴ fibres has been tested in the TT2 transfer line at CERN. The light transmission is rather low, but is compensated by the sensitivity of the CMOS camera. The system had a field of view of 60 mm and a spatial resolution of ~1 mm. The radiation hardness of such a fiber bundle was tested at the IRMA-CEA facility in Saclay, France. The bundle was irradiated at a rate of 3.6 kGy/h for 8 consecutive day. The total integrated dose achieved was ~700 kGy, which corresponds to about ten years of operation at the beam imaging station with the highest radiation dose at CERN. While the light transmission was reduced by 50%, this is still adequate to provide acceptable images.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW078

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paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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WEPGW082

The Beam Gas Vertex Profile Monitoring Station for HL-LHC

detector, radiation, real-time, dipole

2672

R. Kieffer, A. Alexopoulos, L. Fosse, M. Gonzalez Berges, H. Guerin, O.R. Jones, T. Marriott-Dodington, J.W. Storey, R. Veness, S. Vlachos, B. Würkner, C. Zamantzas
CERN, Meyrin, Switzerland
S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom

A new instrument is under development for the high luminosity upgrade of the Large Hadron Collider at CERN (HL-LHC) to provide non-invasive beam size measurements throughout the acceleration cycle. The Beam Gas Vertex (BGV) detector consists of a very low pressure gas target inside the beam pipe with a series of particle tracking stations located downstream. Inelastic collisions between the beam and the gas target produce secondary particles which are detected by the tracking stations. The beam size is measured from the spatial distribution of several thousand beam-gas interaction vertices, which are identified by means of the reconstructed tracks. A demonstrator device, operated over the past 3 years, has proven the feasibility of the BGV concept and has motivated development of a fully operational device for the HL-LHC. The status of current design studies for the future instrument will be presented, with particular emphasis on potential tracking detector technologies, readout schemes, and expected performance.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW082

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paper received ※ 13 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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WEPGW120

Fluorescence-Based Imaging Diagnostic for High Average Power Deuteron Beam

neutron, diagnostics, quadrupole, photon

2777

R.A. Marsh, S.G. Anderson, D.J. Gibson, J. Hall, B. Rusnak
LLNL, Livermore, California, USA

Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
Lawrence Livermore National Laboratory is developing an intense, high-brightness fast neutron source to create sub-millimeter-scale resolution neutron radiographs and imag-es. An intense source (10¹¹ n/s/sr at 0 degrees) of fast neutrons (10 MeV) will be produced using a pulsed 7 MeV, 300μAmp average-current commercial deuteron accelerator producing a small (1.5 mm diameter) beam spot size to achieve high resolution. The high average power beam is a challenge for diagnostics, and a precise full power emittance measurement is critical to benchmark the system performance. A fluorescence-based beam profiling diagnostic has been selected, and this paper presents the design for the system including chamber layout, light yield calculations, and imaging system details.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPGW120

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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WEPRB039

Tuning of a Tapered Ridge-Loaded Waveguide Coupler for a Drift Tube LINAC of the Compact Pulsed Hadron Source

GUI, coupling, DTL, linac

2893

Y. Lei, C.T. Du, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People’s Republic of China

This paper presents the tuning result of a tapered ridge-loaded waveguide coupler for the drift tube linac (DTL) of the compact pulsed hadron source (CPHS) at Tsinghua University. The coupler has been designed, manufactured, and mounted on the DTL cavity for the cold measurement and tuning. The iris diameter of the coupler which is related to the coupling coefficient needs to be determined in the tuning experiment, due to the difference between the designed and measured quality factors. Meanwhile, we found that the relationship between the coupling coefficient and iris diameter from the traditional analytical design method is not applicable when the iris diameter is relatively large. In this paper, the target coupling coeffi-cient is analysed, and the limit of the original analytical design is presented. The measurement method is intro-duced to improve the measurement efficiency and the tuning process of the coupling coefficient to the target value is described. After several iterations, the coupling coefficient is tuned to 1.54 which is close to the desired value of 1.56.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB039

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPRB070

Facile Deposition of Superconducting MgB₂ Thin Films on Substrates: A Comparative Investigation of Electrochemical Deposition and Magnetron Sputtering Techniques

cavity, site, superconductivity, FEL

2984

N. Misra, A.N. Hannah, R. Valizadeh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
R. Valizadeh
Cockcroft Institute, Warrington, Cheshire, United Kingdom

Funding: Authors acknowledge the funding received under the Rutherford International Postdoctoral Fellowship Programme
Coating of Copper cavities with a superconducting layer of MgB₂ thin film is an attractive alternative to bulk Nb cavities. In this work, we investigate the application of two approaches-electrochemical deposition and magnetron sputtering of MgB₂, to fabricate MgB₂ films with potential accelerator applications. In the first approach, MgB₂ powder dispersed in acetone was used as an electrolytic medium. Application of a DC voltage of 400 V between a graphite anode and a Copper film (serving as cathode), with the electrode distance maintained at ~2cm, resulted in the electrochemical deposition of MgB₂ on the Cu surface. In an alternate approach, MgB₂ in powder form was used directly for sputtering based deposition. The powder was initially compacted to form a thin layer that served as the magnetron target. Application of a pulsed DC power of 25W for 4 hours yielded MgB₂ thin film on Si substrates. Samples were characterized by XPS analysis to ascertain their elemental composition, which confirmed the presence of Mg and B, in addition to traces of C and O as impurities. Surface morphology was determined using SEM characterization technique. Further work to determine the superconducting properties of the samples and fine tune the deposition processes for large scale MgB₂ deposition inside actual RF cavities is in progress.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPRB070

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paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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WEPTS025

MiniScatter, a Simple Geant4 Wrapper

simulation, detector, interface, plasma

3152

K.N. Sjobak, H. Holmestad
University of Oslo, Oslo, Norway

Funding: Research Council of Norway, project 255196
In order to estimate what happens to particle beams when they hit windows, gas, and various other targets, a simple tool has been developed based on Geant4. This tool wraps geometry setup, primary beam generation from Twiss parameters, visualization, and automatic analysis and plots in a simple-to-use command-line tool. Furthermore, a Jupyter-friendly Python interface for running simulations and parallelized parameter scans is included. The code, its interface, and a few selected examples will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS025

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPTS026

Generalised Scattering Module in SixTrack 5

scattering, lattice, experiment, proton

3156

K.N. Sjobak
University of Oslo, Oslo, Norway
H. Burkhardt, R. De Maria, V.K.B. Olsen
CERN, Geneva, Switzerland

Funding: Research Council of Norway, project 255196, and HL-LHC WP8
A generalised scattering module has recently been added to SixTrack. This module enables the use of arbitrary generators and target profiles. Presently, a simple model of elastic scattering and a coupling to Pythia8 have been implemented. This makes it possible to use SixTrack for studies of aperture losses and beam lifetime as a result of beam–beam scattering.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS026

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPTS099

Passive Absorbers for Maximizing the Performance of the Mu2e-II Experiment

experiment, solenoid, proton, collimation

3345

J. Manczak
IFIC, Valencia, Spain
J. Manczak
Warsaw University, Warsaw, Poland
D.V. Neuffer, D. Stratakis
Fermilab, Batavia, Illinois, USA

The Fermilab’s Mu2e experiment is designed to search for Charged Lepton Flavour Violation in direct, neutrinoless conversion of muon into electron in the presence of a nucleus’ electromagnetic field. Quantity, which is going to be observed is the ratio between the rate of the above BSM (Beyond Standard Model) reaction and the rate of the standard muon capture on the nucleus. The measurement precision is expected to reach up to 10^-17. Mu2e-II is the codename for the second phase of the experiment planned to run with the lower energy, higher intensity primary proton beam provided by PIP-II accelerator, currently under construction. The ionization cooling with a wedge absorber is introduced to Mu2e-II setup for potential increase in the number of low momentum muons reaching the target. The study is made into the position and size of the wedge inside the beamline using G4Beamline simulation framework. Results show an increase up to 12% for muons with momentum P below 30 MeV/c and 7% for muons with P<40 MeV/c when the beam is measured right after the wedge. Further studies are necessary to investigate how this gain can be delivered to the stopping target.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS099

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paper received ※ 13 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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WEPTS107

Designing the European Spallation Source Tuning Dump Beam Imaging System

proton, radiation, linac, optics

3374

M.G. Ibison, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
E. Adli, G. Christoforo, H. Gjersdal
University of Oslo, Oslo, Norway
M.G. Ibison, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
T.J. Shea, C.A. Thomas
ESS, Lund, Sweden

Funding: In-Kind Agreement, ESS/Norway
The first section of the European Spallation Source (ESS) to receive high-energy protons when live operation begins will be the Tuning Dump beam-line. The dump line will be used during accelerator commissioning to tune the linac, and must accept the full range of ESS energies up to 2 GeV, from 5µs probe pulse to full 2.86ms pulse length, and beam sizes up to the 250 mm limit of the physical aperture, although the allowed pulse rate will be restricted by the thermal capacity of the dump. An imaging system has been developed to view remotely the transverse beam profile in the section immediately before the dump entrance, using insertable scintillator screens. This contribution presents the principal design parameters for this system, with particular reference to the techniques used in assessing the radiation and thermal environments and their impact on the selection of locations for the imaging cameras, and the specification of the mechanical screen actuators. The predicted optical performance of the system is also summarised.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-WEPTS107

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THXPLM1

LHC Injectors Upgrade Project: Towards New Territory Beam Parameters

proton, operation, injection, extraction

3385

M. Meddahi, R. Alemany-Fernández, H. Bartosik, G. Bellodi, J. Coupard, H. Damerau, G.P. Di Giovanni, F.B. Dos Santos Pedrosa, A. Funken, B. Goddard, K. Hanke, A. Huschauer, V. Kain, A.M. Lombardi, B. Mikulec, S. Prodon, G. Rumolo, R. Scrivens, E.N. Shaposhnikova
CERN, Meyrin, Switzerland

The LHC injectors Upgrade (LIU) project aims at increasing the intensity and brightness in the LHC injectors in order to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring high availability and reliable operation of the injectors complex up to the end of the HL-LHC era (ca. 2035). This requires extensive hardware modifications and new beam dynamics solutions in the entire LHC proton and ion injection chains: the new Linac4, the Proton Synchrotron Booster, the Proton Synchrotron the Super Proton Synchrotron together with the ion PS injectors (the Linac3 and the Low Energy Ion Ring). All hardware modifications will be implemented during the 2019-2020 CERN accelerators shutdown. This talk would analyze the various project phases, share the lessons learned, and conclude on the expected beam parameter reach, together with the related risks.

Slides THXPLM1 [20.029 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THXPLM1

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THXXPLM1

NUCLOTRON Development for NICA Acceleration Complex

acceleration, proton, extraction, injection

3396

E. Syresin, N.N. Agapov, A.V. Alfeev, V. Andreev, A.A. Baldin, A.M. Bazanov, O.I. Brovko, V.V. Bugaev, A.V. Butenko, D.E. Donets, E.D. Donets, E.E. Donets, A.V. Eliseev, V.V. Fimushkin, B.V. Golovenskiy, E.V. Gorbachev, A. Govorov, E.V. Ivanov, V. Karpinsky, V. Kekelidze, H.G. Khodzhibagiyan, A. Kirichenko, V.V. Kobets, S.A. Kostromin, A.D. Kovalenko, O.S. Kozlov, K.A. Levterov, D.A. Lyuosev, A.A. Martynov, I.N. Meshkov, V.A. Mikhailov, V.A. Monchinsky, A. Nesterov, A.L. Osipenkov, D.O. Ponkin, S. Romanov, P.A. Rukojatkin, K.V. Shevchenko, I.V. Shirikov, A.A. Shurygin, A.O. Sidorin, V. Slepnev, A.V. Smirnov, G.V. Trubnikov, A. Tuzikov, B. Vasilishin
JINR, Dubna, Moscow Region, Russia
A. Belov
RAS/INR, Moscow, Russia
A.V. Philippov, V. Volkov
JINR/VBLHEP, Dubna, Moscow region, Russia

The Nuclotron is the basic facility of JINR used to generate beams of protons, polarized deuterons and protons, and multi charged ions in the energy range of up to 5.6 GeV/n. Polarized deuteron and proton beams were obtained at the intensity of 2×10⁹ ppp and 108 ppp, respectively. The injection with RF adiabatic capture was used in two last Nuclotron runs where C⁶⁺, Xe⁴²⁺, Kr²⁶⁺ and Ar¹⁶⁺ ion beams were accelerated. The resonant stochastic extraction (RF knockout technique) was realized. The complex is now used for fixed target experiments with extracted beams and experiments with an internal target. In the near future, the Nuclotron will be the main synchrotron of the NICA collider facility being constructed at JINR. The installation in the Nuclotron of beam injection system from the Booster and of the fast extraction system in the Collider are required for its operation in the NICA complex. In the frame of the Nuclotron injection chain upgrade, a new light ion linac (LILac) for protons and ions will be built.

Slides THXXPLM1 [10.806 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THXXPLM1

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paper received ※ 29 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPMP005

Charge Stripping at High Energy Heavy Ion Linacs

heavy-ion, linac, acceleration, ion-source

3452

W.A. Barth, S. Yaramyshev
GSI, Darmstadt, Germany
W.A. Barth
HIM, Mainz, Germany
W.A. Barth, T. Kulevoy, S.M. Polozov, S. Yaramyshev
MEPhI, Moscow, Russia
A.S. Fomichev, L.V. Grigorenko
JINR, Dubna, Moscow Region, Russia
T. Kulevoy
NRC, Moscow, Russia

For heavy-ion accelerator facilities charge stripping is a key Technology: the stripping charge state, its efficiency to produce ions in the required charge state, and the beam quality after stripping substantially determine the entire accelerator performance. Modern heavy ion accelerator facilities such as the future Facility for Antiproton and Ion Research (FAIR) at GSI provide for high intensity heavy ion beams beyond 200 MeV/u. Heavy ion stripping at a lower energy enables more efficient acceleration up to the final beam energy, compared to acceleration of ions with a low charge state. Due to the high power deposited by the heavy ions in the stripping media and radiation damages if a solid target is used, self-recovering stripper media must be applied. General implementation options for different stripper target media are discussed in this paper, as well as general considerations to optimize the Linac layout through the appropriate choice of stripping medium and stripping energy. The driver Linac for the Dubna Electron-Radioactive Isotope Collider fAcility (DERICA) project, recently initiated by JINR, is foreseen to provide for 100 MeV/u Uranium beam in continuous wave mode. First layout scenarios of a one-step and a two-step DERICA-stripper approach will be also presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP005

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paper received ※ 22 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPMP006

Study on the Theta Pinch Plasmas for Applied as Ion Stripper

plasma, electron, experiment, heavy-ion

3456

K. Cistakov, Ph. Christ, M. Fröhlich, M. Iberler, J. Jacoby, L. Manganelli, G. Xu
IAP, Frankfurt am Main, Germany
R. Gavrilin, A. Khurchiev, S.M. Savin
ITEP, Moscow, Russia

Funding: Work supported by BMBF contr. No. 05P18RFRB1
With regard to the development of new accelerator technologies for high-intensity ion beams and more efficient acceleration, the transfer of radiation ions to higher charged states is a prerequisite for many experiments. However, the recent stripping technologies such as film and gas stripper for heavy ion beams with the desired intensities required great effort or are not suitable. The contribution presents the current state of plasma strippers with fully ionized hydrogen with simultaneously high particle densities in the range of some 10¹⁷ cm^-3 for FAIR. To achieve this high particle density, an inductive discharge plasma is ignited within a stripper cell parallel to the axis of the ion beam and compressed towards the beam axis. The advantage over conventional ion strippers is about 1000 times smaller recombination rate for electrons*. This significantly increases the equilibrium charge state of ions. At the same time, the relative fraction of ions on the maximum of charge state distribution increases up to 25%**. This should create good conditions for the use of plasma strippers at FAIR.
*Th.Peter, "Energy loss of heavy ions in dense plasma"
**O.Haas, "Simulation Studies of plasma-based charge strippers",Proceedings of IPAC 2015, Richmond, VA, USA

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP006

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paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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THPMP008

Feasibility Study on Mo-99 Production Using Hybrid Method Based on High Power Electron Accelerator

neutron, radiation, electron, photon

3462

A. Taghibi Khotbeh-Sara, F. Rahmani
KNTU, Tehran, Iran
F. Ghasemi
NSTRI, Tehran, Iran
H. Khalafi
AEOI, Tehran, Iran
M. Mohseni Kejani
Shahid Beheshti University, Tehran, Iran

In this study, the idea 99Mo production using hybrid method based on electron accelerator has been pre-sented. Two different main production channels of 100Mo(γ,n)99Mo and 98Mo(n,γ)99Mo can be used for 99Mo production in this system. By considering high power Linac (30 MeV, 1 mA in average beam current) and one-stage approach, the calculation of 100Mo(γ,n)99Mo reactions in the optimized 100Mo target in two different designs (strip and disc) has been simu-lated. It is predicted that about 61 and 53 Ci of 99Mo activity per 24-hour irradiation on the strip target and the disc plates can be achieved, respectively. The threshold energy of photoneutron at 100Mo is about 9 MeV, so a large part of bremsstrahlung photons cannot participate in photoneutron reaction. For feasibility study, new hybrid approach has been tested by 10 MeV Rhodotron. Due to the low threshold of photo-neutron in deuteron (about 2.2 MeV) and significant low energy photons in 100Mo, photoneutron flux is available. So, Molybdenum target in heavy water Tank increases the production yield of 99Mo using neutron absorption reaction in 98Mo. The total activity of 99Mo has been predicted about 0.23 Ci per 24 hours e-beam irradiation.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP008

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPMP012

New Industrial Application Beamline for the cERL in KEK

radiation, electron, linac, vacuum

3475

Y. Morikawa, K. Haga, M. Hagiwara, K. Harada, N. Higashi, T. Honda, Y. Honda, M. Hosumi, Y. Kamiya, R. Kato, H. Kawata, Y. Kobayashi, H. Matsumura, C. Mitsuda, T. Miura, T. Miyajima, S. Nagahashi, N. Nakamura, K.N. Nigorikawa, T. Nogami, T. Obina, H. Sagehashi, H. Sakai, M. Shimada, M. Tadano, R. Takai, H. Takaki, O.A. Tanaka, Y. Tanimoto, A. Toyoda, T. Uchiyama, A. Ueda, K. Umemori, M. Yamamoto
KEK, Ibaraki, Japan

The new beam line for the industrial applications is constructed at the cERL (compact Energy Recovery LINAC) in KEK. In these applications, only north straight sections of cERL consisting of injector and main LINAC will be used. The test for the radio isotope production and electron beam irradiation for the materials are firstly planned with very small beam current without energy recovery.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP012

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paper received ※ 11 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPMP021

X-ray Dose Rate of 6/4 MeV European S-band Linac Structure for Industrial Application at RTX

electron, linac, simulation, operation

3494

P. Buaphad, I.G. Jeong, Y. Joo, H.R. Lee
University of Science and Technology of Korea (UST), Daejeon, Republic of Korea
I.G. Jeong, J.Y. Lee
Korea Atomic Energy Research Institute (KAERI), Daejeon, Republic of Korea
Y. Joo, Y. Kim, H.R. Lee
KAERI, Daejon, Republic of Korea
H.D. Park, S. Song
RTX, Daejeon, Republic of Korea

Recently, RTX has been developing a 6/4 MeV European S-band (= 2998 MHz) industrial linac by using a magnetron with a low RF power of about 3 MW for container inspection system (CIS). Its accelerating structure is designed to operate in π/2 mode by coupling 6 accelerating cells together through 5 side-coupled cells. In CIS, high dose rate X-rays from MeV-energy electron beam has been used to detect the possible presence of contrabands in cargoes or truck containers. To determine a dose rate output, the X-ray dose rate can be simulated by using FLUKA Monte Carlo simulation. The aim of this work was to study the effects of thickness of X-ray target on dose rate as well as X-ray dose map at 1.0 m away from the X-ray target. This study gives the thickness of target in which the dose rate can be highest and electron beam current can be lowest.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP021

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paper received ※ 24 May 2019 paper accepted ※ 24 May 2019 issue date ※ 21 June 2019

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THPMP026

Mobile Accelerator Based on Ironless Pulsed Betatron for Dynamic Objects Radiographing

betatron, electron, radiation, ion-source

3500

V.A. Fomichev, A.A. Chinin, S.G. Kozlov, Yu.P. Kuropatkin, V.I. Nizhegorodtsev, I.N. Romanov, K.V. Savchenko, V.D. Selemir, O.A. Shamro, E.V. Urlin
RFNC-VNIIEF, Sarov, Nizhniy Novgorod region, Russia

The paper concerns a mobile accelerator based on the ironless pulsed betatron. The accelerator has a possibility to obtain up to three frames in a single pulse and is aimed to radiograph dynamic objects with a large optical thickness. The block diagram of the accelerator, the temporal diagram of its separate systems operation and oscillograms of the betatron output parameters are provided. The testing powering in a single frame mode was carried out in 2018. The capacitance of the storage of the betatron electromagnet pulsed powering system that defines the electron beam energy was equal to 1800 μF. The following test results have been obtained. The thickness of the lead test object examined with X-rays reached 140 mm at 4 m from the tantalum target of the betatron. The full width of the output gamma pulse at half maximum in a single frame mode was equal to 120 ns; the dimension of the radiation source was 6 mm x 3 mm; the dimension of the tantalum target was 6 mm x 6 mm. The application of these accelerators within the radiographic complex* enables the optimization of the hydrodynamic experiments geometry resulting in the increase of the test efficiency.
* Pat. 2548585 C1 RU MPK G03B 42/02. D.I. Zenkov and others. «Mobile radiographic complex and radiation source of betatron type for radiographic complex» (in Russian), 2015.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP026

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paper received ※ 25 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPMP034

Simulating Matter Interactions of Partially Stripped Ions in BDSIM

electron, simulation, hadron, dipole

3514

A. Abramov, S.T. Boogert, L.J. Nevay
JAI, Egham, Surrey, United Kingdom

Acceleration and storage of beams of relativistic partially stripped ions is more challenging than in the case of fully stripped ions because the interactions with matter, such as those with residual gas and collimators can strip electrons via ionisation. BDSIM is a code for the simulation of energy deposition and charged particle backgrounds in accelerators that uses the Geant4 physics library. Geant4 includes a broad range of ion elastic and inelastic interactions and allows the definition of partially stripped ion beams. However, no models are currently available to handle in-flight interactions involving the bound electrons. In this paper we present a semi-empirical model of beam ion stripping by material atoms that is implemented in BDSIM as an extension of Geant4’s existing physics processes and is fully integrated into a comprehensive set of matter interactions for partially stripped ions. The stripping cross-section for select cases and results from comprehensive simulations are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP034

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPMP036

Beam Dynamics of Novel Hybrid Ion Mass Analysers

detector, site, experiment, injection

3522

R.B. Appleby, T. Rose
UMAN, Manchester, United Kingdom
M.R. Green, P. Nixon, K. Richardson
Waters Corporation, Manchester, United Kingdom

Fourier transform (FT) mass spectrometers achieve high resolution using relatively long transient times by trapping ions and measuring the frequency of their motion (inductively) inside an electrostatic potential. By contrast, time-of-flight (ToF) mass spectrometers measure the time of flight between an initiation pulse and contact with a destructive detector positioned on a plane of space focus after flying along a predetermined route. These devices have relatively short flight times and, generally, lower resolution. A class of hybrid analysers have been proposed and studied, utilising a quadro-logarithmic potential to reflect ions multiple times past an inductive detector, with the potential for the short transient of ToF devices - and the high resolution of FT devices. In this paper we compute the ion dynamics inside such devices, tracking bunches of ions and studying induced signals.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP036

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPMP048

Mu*STAR: A Modular Accelerator-Driven Subcritical Reactor Design

site, neutron, operation, SRF

3555

R.P. Johnson, R.J. Abrams, M.A. Cummings, J.D. Lobo, M. Popovic, T.J. Roberts
Muons, Inc, Illinois, USA

Mu*STAR is an accelerator-driven molten-salt sub-critical reactor based on recent superconducting RF technological breakthroughs that allow a highly efficient and powerful proton accelerator to drive a spallation target inside a graphite-moderated, thermal-spectrum reactor. The additional spallation neutrons can be used to overcome the absorption of neutrons by fission products to allow a deeper burn than is possible with critical reactor designs. Simulations have shown that as much as seven times the energy that was extracted from used fuel from light water reactors can be produced by this method before the accelerator demands significant power from the reactor. Once the fuel rods have been converted from oxide ceramics to fluoride salts, in a process that is proliferation resistant (not chemical reprocessing), the fuel can be burned for centuries without increasing its volume while reducing its radio-toxicity. Our 2017 GAIN voucher grant supported studies by ORNL, SRNL, and INL to design and cost a Fuel Processing Plant to convert used nuclear fuel into the molten-salt fuel for Mu*STAR. Based on those studies, it seems possible to build Mu*STAR systems on existing sites where used fuel is stored, convert it to fluoride salts, and use it to provide affordable carbon-free electricity for centuries.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP048

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paper received ※ 19 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPMP051

Development of 211-Astatine Production in the Crocker Nuclear Laboratory Cyclotron

cyclotron, operation, proton, extraction

3564

E. Prebys
Fermilab, Batavia, Illinois, USA
R.J. Abergel
UCB, Berkeley, California, USA
W.H. Casey
University of California at Davis (UC Davis), Davis, California, USA
D.A. Cebra
UCD, Davis, California, USA

There is a great deal of interest in the medical community in the use of the alpha-emitter 211-At as a therapeutic isotope. Among other things, its 7.2 hour half life is long enough to allow for recovery and labeling, but short enough to avoid long term activity in patients. Unfortunately, the only practical technique for its production is to bombard a 209-Bi target with a ~29 MeV alpha beam, so it is not accessible to commercial isotope production facilities, which all use fixed energy proton beams. The US Department of Energy is therefore supporting the development of a "University Isotope Network" (UIN) to satisfy this need. Our prposoal is to retrofit the variable-energy, multi-species cyclotron at the Crocker Nuclear Laboratory at the University of California Davis with an internal Bi-209 target, such that we can put at least 100 uA of 29 MeV alpha particles on target without concerns about extraction efficiency. Using very conservative assumptions, we are confident we will be able to produce 60 mCi of 211-At in solution in an eight hour shift, which includes setup, exposure, and chemical recovery. This poster will cover the design of the target, as well as the required chemical processing and reliability upgrades.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP051

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPMP052

Recent Progress in R&D for Ionetix Ion-12SC Superconducting Cyclotron for Production of Medical Isotopes

cyclotron, ion-source, controls, cathode

3568

X. Wu, G.F. Blosser, G.S. Horner, Z.S. Neville, J.M. Paquette, N.R. Usher, J.J. Vincent
Ionetix, Lansing, Michigan, USA
D.M. Alt
NSCL, East Lansing, Michigan, USA

The Ion-12SC is a sub-compact, 12.5 MeV proton su-perconducting isochronous cyclotron for commercial medical isotope production recently developed at Ionetix Corporation [1]. The machine features a patented cold steel and cryogen-free conduction cooling magnet, a low power internal cold-cathode PIG ion source, and an inter-nal liquid target [2]. It was initially designed to produce N-13 ammonia for dose on-demand cardiology applica-tions but can also be used to produce F-18, Ga-68 and other medical isotopes widely used in Positron Emission Tomography (PET). The 1st engineering prototype was completed and commissioned in September 2015, and four additional units have been completed since [3]. The first two units have been installed and operated at the University of Michigan and MIT. R&D efforts in physics and engineering have continued to improve machine performance, stability and reliability. These improve-ments include: 1) Water cooling added to the dummy dee to limit the operating temperature of the ion source to improve lifetime and performance, 2) Magnetic field maps, obtained with a Hall probe based mapper, were used to accurately measure the isochronism and provide information needed to compensate for any unwanted 1st harmonics and 3) Feedback based control methods ap-plied to regulate the beam intensity on target by adjusting the ion source cathode current. The C1 unit installed at the University of Michigan Medical School early this year treated ~100 patients/month with N-13 ammonia. The machines are now capable of routinely producing > 21 doses/day with > 99% availability. The Ionetix manu-facturing facility is capable of producing up to 30 ma-chines per year.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPMP052

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPGW001

Design of LhARA - Laser Hybrid Accelerator for Radiobiological Applications

proton, laser, focusing, experiment

3578

J. Pasternak
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
O. Ettlinger, C. Hunt, A. Kurup, K.R. Long, Z. Najmudin, J.K. Pozimski
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
H.T. Lau
EBG MedAustron, Wr. Neustadt, Austria

Recent developments of using lasers interacting with targets for the creation of ion beams offer a possibility to provide beams for radiobiology research. This research aims to precisely study the radiobiological effectiveness of charged particles on various cultures of cells, which is essential to inform next generation hadron therapy treat-ment plans. The Laser hybrid Accelerator for Radiobio-logical Applications (LhARA) has been proposed to use a laser driven beam, which will be captured and focused using Gabor Lenses. The beam will be then energy and momentum selected to create a beam for in-vitro cells studies or sent to a post-accelerator ring to create beam for in-vivo studies. The optical design of LhARA is pre-sented in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW001

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paper received ※ 15 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPGW040

Decay Muon Beamline Design for EMuS

proton, solenoid, simulation, dipole

3670

Y.P. Song, Y. Bao, C. Meng, J.Y. Tang
IHEP, Beijing, People’s Republic of China
Y.K. Chen, H.T. Jing
IHEP CSNS, Guangdong Province, People’s Republic of China

Funding: This work is supported by the Chinese Academy of Sciences.
The beamline design philosophies and simulation re-sults of the decay muon on Experimental Muon Source (EMuS) are reported in this paper. The beamline is com-posed of solenoids to keep large acceptance, and has been optimized for 45, 150 and 450 MeV/c decay muon re-spectively according to the π spectra optimization results from target station. Decay muons from 45 to 150 MeV/c are designed for μSR applications, and 150 to 450 MeV/c are designed for muon imaging, which is unique on the high momentum perspective. Negative muons from 45 to 150 MeV/c are designed for muonic applications. The momentum range of decay muon is tuneable between 45 and 450 MeV/c.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW040

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paper received ※ 01 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPGW041

The Potential of Heavy Ion Beams to Provide Secondary Muon/Neutrino Beam

heavy-ion, proton, solenoid, experiment

3673

H.-J. Cai, L.W. Chen, L. Yang, S. Zhang
IMP/CAS, Lanzhou, People’s Republic of China

This paper focuses on the exploration into the potential of heavy ion beams for the production of the charged pions/muons within different energy ranges which is widely needed for fundamental and applied research. The investigation is performed for the different kinds of beams involving 1H , 4He, 12C, 16O, 40Ar and 136Xe with medium energy within the range of 0.5~2.5 AGeV and high energy of 10 AGeV. Three kinds of typical target configurations, thin graphite plate, long tungsten rod and medium thickness nickel block are adopted. For comparison, graphite and nickel are also used for the long rod geometry. Basically, most of the conventional charged pion/muon beams production cases including surface muon, low energy decay muon, medium energy pion/muon for neutrino beam and highly forward energetic muon are involved and the feasibility of heavy ion beam for these cases is analyzed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW041

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paper received ※ 15 May 2019 paper accepted ※ 20 May 2019 issue date ※ 21 June 2019

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THPGW045

A Simple Way to Introduce an Ajustable Femtosecond Pre-Pulse to Enhance Laser-Driven Proton Acceleration

laser, proton, plasma, acceleration

3686

P.J. Wang, Z.X. Cao, Y.X. Geng, D.F. Kong, C. Lin, JB. Liu, H.Y. Lu, W.J. Ma, Z.S. Mei, Z.P. Pan, Y.R. Shou, D.H. Wang, S.R. Xu, X.Q. Yan, Y.Y. Zhao
PKU, Beijing, People’s Republic of China
G.Y. Gao
LMU, Garching, Germany

We demonstrate a simple way to introduce a femtosecond pre-pulse with adjustable intensity and delay without using an additional compressor to enhance laser-driven proton acceleration. Targets with different thicknesses were shoot at normal incidence by varying the pre-pulses. Experimental results show that significant enhancement on the proton energy can be achieved when the intensity of pre-pulse is optimized. Density profile of preplasma was obtained by bydrodynamic simulations. PIC simulations reveal that the preplasma generated by a femtosecond pre-pulse can increase the intensity of main pulse.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW045

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paper received ※ 30 April 2019 paper accepted ※ 19 May 2019 issue date ※ 21 June 2019

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THPGW049

Fabrication of On-Line Test Facility of Li-8 Beam at KOMAC

optics, ion-source, proton, linac

3697

J.J. Dang, Y.-S. Cho, H.S. Kim, H.-J. Kwon, P. Lee, Y.G. Song
Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea

Funding: This work has been supported through KOMAC operation fund of KAERI by MSIT and the NRF of Korea grant funded by the Korea government (MSIT) (No. NRF-2017M2A2A6A02071070).
A Li-8 beam facility has been developed at KOMAC. A target/ion source (TIS) was fabricated, and heating experiment of a target heater and a surface ion source was conducted at off-line test site. Also, beam optics components were developed. They are utilized in Li-8 beam line that electrostatic steerers to adjust misalignment of the beam, Einzel lens to focus beam and Wien filter to separate Li-8. Furthermore, a high-energy beta-ray telescope detector was developed as a dedicated beta-decay spectrometer for diagnostics of the Li-8 beam. The TIS, the beam optics and the beam diagnostics are installed in a target room (TR104) of the 100-MeV proton linac. An experiment of the proton beam transportation into TR10⁴ and the TIS heating experiment were conducted separately. Finally, the on-line test of TIS has been conducted to generate Li-8 beam and examine the beam optics and the diagnostics.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW049

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPGW053

Exploiting the Potential of ISOLDE at CERN (the EPIC Project)

ISOL, experiment, storage-ring, proton

3706

R. Catherall, T.J. Giles, G. Neyens
CERN, Geneva, Switzerland

The ISOLDE Facility at CERN * is the world’s leading facility for the production of radioactive ion beams (RIBs) using the ISOL (Isotope Separation On-Line) method, providing RIBs at energies from 30 keV to 10 MeV/u for a wide variety of experiments. To improve on its capacity to deliver RIBs further from stability, the EPIC project takes full advantage of recent investments by CERN to upgrade the LHC injectors **. In particular, the new Linac4 and the PS Booster upgrade allow expanding the scope of ISOLDE by providing higher radioactive ion beam intensities further from stability. Sharing the proton-beam between two target stations that simultaneously feed the low-energy and high-energy beam lines will more than double the annual available beam time for experiments. To take further advantage of enhanced beam time, CERN and the ISOLDE collaboration also aims to studies installing a storage ring behind the HIE-ISOLDE post-accelerator to allow the storage of cooled exotic ion beams and thus opening up new possibilities in the fields of astrophysics, fundamental symmetry studies, atomic physics and nuclear physics.
* B. Jonson, K. Riisager (2010), Scholarpedia, 5(7):9742 doi:10.4249/scholarpedia.9742
** K. Hanke et al.DOI: 10.18429/JACoW-IPAC2017-WEPVA036

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paper received ※ 15 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPGW058

Design and Study of a 6 Degree-Of-Freedom Universal Adjustment Platform for HL-LHC Components

alignment, radiation, operation, ECR

3720

M. Sosin, T. Blaszczyk, A. Herty, J. Jaros, H. Mainaud Durand
CERN, Meyrin, Switzerland

In the accelerator domain, the safe and easy alignment of components located in radioactive areas, is a main concern. The position of devices, such as magnets and collimators, has to be adjusted in a fast and ergonomic way to decrease the ionizing dose received by the personnel. Each equipment type has its own unique set of requirements such as the weight, or the desired position accuracy. The two opposite approaches are, on one hand, a simple and time-consuming manual adjustment, using regulating screws and shims, and, on the other hand, the use of precise and expensive automatic positioning stages and platforms. In the frame of the High Luminosity LHC project, in order to fulfill the safety and technical requirements of alignment for lightweight components, a standardized system is under development. It will provide easy, low-cost and fast adjustment capability for several types of components that could be embarked on it. This paper describes the design, the study and the test results of such a universal adjustment solution. The engineering approach, the lessons learned, the issues and the mechanical components behavior are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW058

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paper received ※ 10 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPGW061

The K12 Beamline for the KLEVER Experiment

photon, detector, experiment, background

3726

M.W.U. Van Dijk, D. Banerjee, J. Bernhard, M. Brugger, N. Charitonidis, N. Doble, L. Gatignon, A. Gerbershagen, E. Montbarbon, B. Rae, M.S. Rosenthal, B. Veit
CERN, Geneva, Switzerland
G. D’Alessandro
JAI, Egham, Surrey, United Kingdom
M. Moulson
INFN/LNF, Frascati, Italy

The KLEVER experiment is proposed to run in the CERN ECN3 underground cavern from 2026 onward. The goal of the experiment is to measure BR(KL -> pi0 nu nu), which could yield information about potential new physics, by itself and in combination with the measurement of BR(K+ -> pi+ nu nu) of NA62. A full description will be given of the considerations in designing the new K12 beamline for KLEVER, as obtained from a purpose made simulation with FLUKA. The high intensities required by KLEVER, 2·10¹³ protons on target every 16.8s, with 5·10¹⁹ protons accumulated over 5~years, place stringent demands on adequate muon sweeping to minimize backgrounds in the detector. The target and primary dump need to be able to survive these demanding conditions, while respecting strict radiation protection criteria. A series of design choices will be shown to lead to a neutral beamline sufficiently capable of suppressing relevant backgrounds, such as photons generated by pi0 decays in the target, and Lambda -> npi0 decays, which mimic the signal decay.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW061

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paper received ※ 30 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPGW062

The New CERN East Area Primary and Secondary Beams

secondary-beams, radiation, optics, proton

3730

E. Montbarbon, D. Banerjee, J. Bernhard, D. Brethoux, M. Brugger, B.D. Carlsen, N. Charitonidis, A. Ebn Rahmoun, S. Evrard, L. Gatignon, A. Gerbershagen, E. Harrouch, M. Lazzaroni, B. Rae, M.S. Rosenthal, M.W.U. Van Dijk
CERN, Geneva, Switzerland

The East Area is one of the intensely used facilities at CERN, now serving for over 56 years beams to more than 20 user teams and experiments for about 200 days of running each year. Besides primary proton and ion beams for the irradiation facilities IRRAD and CHARM, mixed secondary beams of hadrons, electrons and muons within a range of 0.5 GeV/c to 12 GeV/c are provided. The CERN management approved an upgrade and renovation of the full facility to meet reliably future beam test and physics requirements. We present new, flexible beam optics that will assure better purity of the secondary beams, even with the new possibility of highly pure electron, hadron or muon beams. The upgrade also includes a pulsed powering scheme with energy recovering power supplies and new laminated magnets that will reduce both power and cooling requirements. The renovation phase started already and first beams in the new facility will be delivered from 2021 on.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW062

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paper received ※ 03 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPGW064

Commissioning Results of the Tertiary Beam Lines for the CERN Neutrino Platform Project

MMI, experiment, positron, simulation

3738

M.S. Rosenthal, N. Charitonidis, E.M. Nowak, I. Ortega Ruiz
CERN, Geneva, Switzerland
A.C. Booth
University of Sussex, Brighton, United Kingdom
Y. Chatzidaki
National Technical University of Athens, Zografou, Greece
Y. Karyotakis
IN2P3-LAPP, Annecy-le-Vieux, France
P.R. Sala
INFN-Milano, Milano, Italy

For many decades the CERN North Area facility at the Super Proton Synchrotron (SPS) has delivered secondary beams to various fixed target experiments and test beams. In 2018, two new tertiary extensions of the existing beam lines, designated "H2-VLE" and "H4-VLE", have been constructed and successfully commissioned. These beam lines have been designed to provide charged particles of both polarities in the momentum range from 0.3 GeV/c to 12 GeV/c. During the design phase, multiple simulation tools and techniques have been employed to optimize the tertiary beam line layout in terms of particle production, transverse beam dynamics and particle identification on an event-by-event basis. In this paper, a comparison of the simulated performance and the first measurement results obtained during the commissioning phase are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW064

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paper received ※ 24 April 2019 paper accepted ※ 18 May 2019 issue date ※ 21 June 2019

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THPGW069

Implementation of CERN Secondary Beam Lines T9 and T10 in BDSIM

optics, secondary-beams, simulation, software

3746

G. D’Alessandro, S.T. Boogert, S.M. Gibson, L.J. Nevay, W. Shields
JAI, Egham, Surrey, United Kingdom
J. Bernhard, A. Gerbershagen, M.S. Rosenthal
CERN, Geneva, Switzerland

CERN has a unique set of secondary beam lines, which deliver particle beams extracted from the PS and SPS accelerators after their interaction with a target, reaching energies up to 400 GeV. These beam lines provide a crucial contribution for test beam facilities and host several fixed target experiments. A correct operation of the beam lines requires precise simulations of the beam optics and studies on the beam-matter interaction, radiation protection, beam equipment survival etc. BDSIM combines tracking studies with energy deposition and beam-matter interaction simulations within one software framework. This paper presents studies conducted on secondary beams with BDSIM for the beam lines T9 and T10. We report the tracking analysis and the energy deposition along the beam line. Tracking analysis validation is demonstrated via comparison to existing code.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPGW069

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paper received ※ 30 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPRB013

The ESSnuSB Target Station

proton, hadron, linac, electron

3831

E. Bouquerel, E. Baussan, L. D’Alessi, M. Dracos
IPHC, Strasbourg Cedex 2, France
P. Cupial, M. Koziol
AGH University of Science and Technology, Kraków, Poland
N. Vassilopoulos
IHEP, Beijing, People’s Republic of China

Funding: This project is supported by the COST Action CA15139 EuroNuNet. It has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.
The ESSνSB project, recently granted by the EU H₂020 programme for a 4-year design study, proposes to use the protons produced by the linac (2 GeV, 5 MW) of the European Spallation Source (ESS) currently in construction in Lund (Sweden) to deliver a neutrino super beam. It follows the studies made by the FP7 Design Study EUROν[1] (2008-2012), regarding future neutrino facilities. The primary proton beam line completing the linear accelerator will consist of one or several accumulator rings and a proton beam switchyard. The secondary beam line producing neutrinos will consist of a four-horn/target station, a decay tunnel and a beam dump. A challenging component of this project is the enormous target heat-load generated by the 5 MW proton beam. In order to reduce this heat-load there will be four targets, which will be hit in sequence by the compressed proton pulses, thereby reducing the beam power on each target to 1.25 MW. Following the EUROν studies, a packed bed of titanium spheres cooled with helium gas has become the baseline design for a Super Beam based on a 2-5 GeV proton beam with a power of up to 1 MW per target, with other targets being considered for comparison. The hadron collection will be performed by four hadron collectors (magnetic horns), one for each target. Each of these target/hadron-collector assemblies will receive proton pulses three times more frequently than in present projects, and by an average beam power of 1.25 MW, which is twice as high as in present neutrino projects. The feasibility of the target/horn station for the ESSνSB project is discussed here.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB013

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paper received ※ 15 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPRB019

Collimation of Target Induced Halo Following MAGIX at MESA

simulation, beam-losses, experiment, cryomodule

3839

B. Ledroit
IKP, Mainz, Germany
K. Aulenbacher
KPH, Mainz, Germany
K. Aulenbacher
GSI, Darmstadt, Germany
K. Aulenbacher
HIM, Mainz, Germany

Funding: Supported by the DFG through GRK 2128
The Mainz Energy-recovering Superconducting Accelerator (MESA) will be an electron accelerator allowing operation in energy-recovery linac (ERL) mode. It provides the opportunity to operate scattering experiments at energies of ~100 MeV with thin gas-targets. The MESA Internal Gas Target Experiment (MAGIX) aims to operate windowless jet targets and different gases up to Xenon to search for possible dark photon interactions, to precisely measure the magnetic proton radius and astrophysical S-factors. Investigations on the impact of the target on beam dynamics and beam losses are required for machine safety and to examine limits to ERL operation. The goal of this work is to understand target induced halo in the different experimental setups, track halo particles through downstream sections to examine beam losses and include a suitable collimation system and shielding into the accelerator layout to protect the machine from direct and indirect damage through beam losses and radiation. The present status of the investigations is presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB019

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paper received ※ 30 April 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPRB055

DAMAGE BEHAVIOR OF TUNGSTEN TARGETS FOR 6 MEV LINEAR ACCELERATORS

experiment, electron, ECR, controls

3934

Z.H. Wang, Z.N. Liu, J. Shi, H. Zha
TUB, Beijing, People’s Republic of China

The target in electron linear accelerator is subjected to high-frequency and intense thermal shocks. Elevated temperatures in the target may lead to target recrystallization, fatigue cracking, creep and vaporization. In this study, experiments were carried out to investigate the damage behaviour of tungsten targets in 6 MeV linear accelerators under pulsed electron beam. The results show that recrystallization occurs after loading 6 MeV electron beam with repetition frequency of 220 Hz, pulse width of 4μs and mean current of 151μA for 248 s. Deformation and cracking caused by recrystallization are observed on the surface of the target.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB055

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paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPRB056

Dose Measurement Experiments for Single and Composite Targets in 6 Mev Linear Accelerators

site, electron, experiment, simulation

3937

Z.H. Wang, J.Y. Liu, J. Shi, H. Zha
TUB, Beijing, People’s Republic of China

The target in electron linear accelerator plays an im-portant role in the production of photon. Targets of different materials and thicknesses have different X-ray yields. In this study, experiments were carried out to measure the dose rates of single targets and composite targets of different thicknesses for 6 MeV linear accel-erators utilizing ionization chamber. The electron ener-gy spectrum at the outlet of accelerating tube was de-tected with magnetic analyser. The experimental results show consistent rules with Monte Carlo simulations. Composite material target of 1.2 mm tungsten and 2 mm copper can deliver 1242 rad/min/100uA dose rate at 1 meter in front of the target. Dose rates of tungsten- rhenium alloy(74%W-26%rhenium) targets were exam-ined too.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB056

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paper received ※ 14 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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THPRB085

HiRadMat: A Facility Beyond the Realms of Materials Testing

proton, experiment, radiation, instrumentation

4016

F.J. Harden, A. Bouvard, N. Charitonidis, Y. Kadi
CERN, Geneva, Switzerland

The ever-expanding requirements of high-power targets and accelerator equipment has highlighted the need for facilities capable of accommodating experiments with a diverse range of objectives. HiRadMat, a High Radiation to Materials testing facility at CERN has, throughout operation, established itself as a global user facility capable of going beyond its initial design goals. Pulsed high energy, high intensity, proton beams have been delivered to experiments ranging from materials testing, detector’s prototype validation, radiation to electronics assessment and beam instrumentation. A 440 GeV/c proton beam is provided directly from the CERN SPS. Up to 288 bunches/pulse at a maximum pulse intensity of 3.5 x 10¹³ protons/pulse can be delivered. Through collaborative efforts, HiRadMat has developed into a state-of-the-art facility with improved in situ measurement routines, beam diagnostic systems and data acquisition techniques, offered to all users. This contribution summarises the recent experimental achievements, highlights previous facility enhancements and discusses potential future upgrades with particular focus on HiRadMat as a facility open to novel experiments.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB085

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paper received ※ 29 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPRB102

Monte Carlo Optimization of Fast Beam Loss Monitors for LCLS-II

detector, photon, electron, simulation

4066

M. Santana-Leitner, C.I. Clarke, A.S. Fisher, A.M. Harris, C. Hast, T.T. Liang
SLAC, Menlo Park, California, USA
E. Griesmayer
CIVIDEC Instrumentation, Wien, Austria

Funding: Work supported by U.S. Department of Energy contract DE-AC02-76SF00515
Commissioning of the LCLS-II hard X-ray FEL is starting at SLAC National Accelerator Laboratory. This facility will ultimately accelerate electrons to 8 GeV, with beams of 375 kW at 1 MHz. At such high-powers, errant beams will need to be detected very fast -200 μs- to limit exposure and to protect beam-line and safety components. Currently, LCLS-I uses ion chambers both as Point Beam Loss Monitors (PBLM) by collimators, dumps, septa, etc., and also as Long Beam Loss Monitors (LBML) that provide detection coverage in extended areas where the accelerator enclosure is not sufficiently thick to shield full beam losses. But due to the finite ion mobility and related screening effects, ion chambers are not fast enough, and their response would not be linear at high charge rates. LCLS-II will use synthetic mono-crystalline diamond chips as PBLMs, as those offer nanosecond time resolution due to the high mobility of holes generated in the valence band by charged particles. LBLMs will be 200 m-long optical fibers, with photomultipliers to detect Cerenkov photons produced by charged particles in the fibers. Use of these technologies requires tests and models to correlate their response to different beam losses. Response functions for these detectors have been developed for the FLUKA Monte Carlo code. After benchmarking the models, these have been applied to place PBLMs at locations where signal is relatively insensitive to beam-strike uncertainties and sufficiently above electronic noise, while keeping lifetime to radiation-damage long. Also, topologies where found were one PBLM can protect several components, resulting in cost reductions. As for LBLMs, the existing model helps scale signals for different beam loss configurations as a function of the fiber position.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB102

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paper received ※ 14 May 2019 paper accepted ※ 22 May 2019 issue date ※ 21 June 2019

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THPTS077

Beam Instability Induced by RF System of an FEL-THZ Source

electron, FEL, linac, radiation

4298

X.D. Tu, G. Feng, S.J. He, T. Hu, J. Jiang, S.Y. Lu, Y.Q. Xiong
HUST, Wuhan, People’s Republic of China

An SLAC-like Compact Linac installed on the HUST FEL-THz has been used as an injector to produce high power THz radiation. To meet the requirements of monochromaticity and repeatability for FEL, performance of electron beam and stability of RF system are notable. According to the existing facility, based on measurement results of RF jitter, instability of beam has been calculated, and it has been verified in relevant experiments. Furthermore, stability targets in RF system has been pro-posed in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS077

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paper received ※ 14 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS103

First Results of the Analytical Method Used to Reduce Downtime Risk at an Accelerator Facility

linac, operation, DTL, vacuum

4349

W.C. Barkley, M.J. Borden, R.W. Garnett, M.S. Gulley, E.L. Kerstiens, M. Pieck, D. Rees, F.E. Shelley, B.G. Smith
LANL, Los Alamos, New Mexico, USA

Funding: DOE
The Los Alamos Neutron Science Center (LANSCE), like many other accelerator facilities, was built decades ago and has been repurposed when new missions were adopted. With an ongoing beam availability expectation of at least 80% delivered to the Experimental Areas (EAs), a balance between cost of spare equipment and budget has always been a challenge. Beam availability data has been meticulously captured and binned over the years to completely characterize the Structures, Systems and Components (SSCs) and other factors that have caused or contributed to accelerator downtime. Over these years, a critical spares list prioritized the spare equipment purchases that were deemed most critical by the management team. In the span of the years 2013 ’ 2015, significant accelerator upgrades and equipment replacements were performed in a set of activities known as LANSCE-RM. Last year, a new risk-based approach was developed by the management team that included an analytical assessment and a quantitative evaluation of probability and consequence. The resulting risk register (risk-based equipment list) is being used to guide decisions on funding requests and provide justification to mitigate operational risks. A paper by the same authors was published at LINAC 2018 describing this risk-based approach that serves to reformulate the critical spares list. This paper, in the sections that follow, expands on the approach by detailing the specific results of the analyses that led to the first risk register. Additionally, it evaluates the historical beam downtime at LANSCE compared to the current funding allocation choices made to increase the reliability.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS103

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paper received ※ 10 May 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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THPTS117

Results of CEA Tests of SARAF Cavities Prototypes

cavity, pick-up, linac, detector

4356

G. Ferrand, G. Jullien, S. Ladegaillerie, F. Leseigneur, C. Madec, N. Misiara, N. Pichoff, O. Piquet, L. Zhao
CEA-IRFU, Gif-sur-Yvette, France
P. Carbonnier, F. Éozénou, E. Fayette, L. Maurice, C. Servouin
CEA-DRF-IRFU, France
A. Pérolat
CEA, Gif-sur-Yvette, France

CEA is committed to delivering a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons to 35 MeV or deuterons to 40 MeV. The SCL consists in 4 cryomodules. The first two cryomodules host 6 & 7 half-wave resonator (HWR) low beta cavities (β = 0.09) at 176 MHz, and the last two crymodules host 7 HWR medium beta cavities (β = 0.18). The low beta prototype was qualified, the medium beta is being qualified. The results of the RF tests will be presented in this poster.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPTS117

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paper received ※ 23 April 2019 paper accepted ※ 23 May 2019 issue date ※ 21 June 2019

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FRXPLM1

Operations Experience of SNS at 1.4MW and Upgrade Plans for Doubling the Beam Power

operation, proton, neutron, cryomodule

4380

J. Galambos
ORNL, Oak Ridge, Tennessee, USA

In 2018, the SNS begins operation at the design proton beam power of 1.4 MW. This talk will present the critical technical challenges that were overcome in order to take the final step in beam power with a higher than 90% reliability. In addition, the future project of the SNS for doubling the beam power from 1.4 MW to 2.8 MW and construction of second target station will be discussed.

Slides FRXPLM1 [22.095 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-FRXPLM1

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paper received ※ 13 May 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

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