Keyword: proton
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SUPAF05 Polarized Proton Beams From Laser-Induced Plasmas laser, polarization, target, plasma 46
 
  • M. Büscher, J. Böker, R. Engels, I. Engin, R. Gebel, A. Hützen, A. Lehrach
    FZJ, Jülich, Germany
  • A.M. Pukhov, J. Thomas
    HHUD, Dusseldorf, Germany
  • T. P. Rakitzis, D. Sofikitis
    University of Crete, Heraklion, Crete, Greece
  
  Laser-dri­ven par­ti­cle ac­cel­er­a­tion has un­der­gone im­pres­sive progress in re­cent years. Nev­er­the­less, one un­ex­plored issue is how the par­ti­cle spins are in­flu­enced by the huge mag­netic fields in­her­ently pre­sent in the plas­mas. In the frame­work of the JuS­PARC (Jülich Short-Pulse Par­ti­cle and Ra­di­a­tion Cen­ter) fa­cil­ity and of the ATHENA con­sor­tium, the laser-dri­ven gen­er­a­tion of po­lar­ized par­ti­cle beams in com­bi­na­tion with the de­vel­op­ment of ad­vanced tar­get tech­nolo­gies is being pur­sued. In order to pre­dict the de­gree of beam po­lar­iza­tion from a laser-dri­ven plasma ac­cel­er­a­tor, par­ti­cle-in-cell sim­u­la­tions in­clud­ing spin ef­fects have been car­ried out for the first time. For this pur­pose, the Thomas-BMT equa­tion, de­scrib­ing the spin pre­ces­sion in elec­tro­mag­netic fields, has been im­ple­mented into the VLPL (Vir­tual Laser Plasma Lab) code. A cru­cial re­sult of our sim­u­la­tions is that a tar­get con­tain­ing pre-po­lar­ized hy­dro­gen nu­clei is needed for pro­duc­ing highly po­lar­ized rel­a­tivis­tic pro­ton beams. For the ex­per­i­men­tal re­al­iza­tion, a po­lar­ized HCl gas-jet tar­get is under con­struc­tion the Forschungszen­trum Jülich where the de­gree of hy­dro­gen po­lar­iza­tion is mea­sured with a Lamb-shift po­larime­ter. The final ex­per­i­ments, aim­ing at the first ob­ser­va­tion of a po­lar­ized par­ti­cle beam from laser-gen­er­ated plas­mas, will be car­ried out at the 10 PW laser sys­tem SULF at SIOM/Shang­hai.  
slides icon Slides SUPAF05 [3.927 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAF05  
About • paper received ※ 19 October 2018       paper accepted ※ 24 October 2018       issue date ※ 26 January 2019  
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SUPAG05 Muon Background Studies for Beam Dump Operation of the K12 Beam Line at CERN experiment, target, background, simulation 93
 
  • M.S. Rosenthal, D. Banerjee, J. Bernhard, M. Brugger, N. Charitonidis, B. Döbrich, L. Gatignon, A. Gerbershagen, E. Montbarbon, B. Rae, M.W.U. Van Dijk
    CERN, Geneva, Switzerland
  • T. Spadaro
    INFN/LNF, Frascati, Italy
  
  In the scope of the Physics Be­yond Col­lid­ers study at CERN a fu­ture op­er­a­tion of the NA62 ex­per­i­ment in beam dump mode is dis­cussed, en­abling the search for dark sec­tor par­ti­cles, e.g. heavy neu­tral lep­tons, dark pho­tons and ax­ions. For this pur­pose, the 400 GeV/c pri­mary pro­ton beam, ex­tracted from the SPS, will be dumped on a mas­sive dump col­li­ma­tor lo­cated in the front end of the K12 beam line. Muons orig­i­nat­ing from in­ter­ac­tions and de­cays form a po­ten­tial back­ground for this kind of ex­per­i­ment. To re­duce this back­ground, mag­netic sweep­ing within the beam line is em­ployed. In this con­tri­bu­tion, the muon pro­duc­tion and trans­port has been in­ves­ti­gated with the sim­u­la­tion frame­work G4beam­line. The high com­pu­ta­tional ex­pense of the muon pro­duc­tion has been re­duced by im­ple­ment­ing sam­pling meth­ods and pa­ram­e­triza­tions to es­ti­mate the amount of high-en­ergy muons and ef­fi­ciently study op­ti­miza­tions of the mag­netic field con­fig­u­ra­tion. These meth­ods have been bench­marked with mea­sured data, show­ing a good qual­i­ta­tive agree­ment. Fi­nally, first stud­ies to re­duce the muon back­ground by adapt­ing the mag­netic field con­fig­u­ra­tion are pre­sented, promis­ing a po­ten­tial back­ground re­duc­tion by a fac­tor four.  
slides icon Slides SUPAG05 [1.885 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAG05  
About • paper received ※ 19 October 2018       paper accepted ※ 28 January 2019       issue date ※ 26 January 2019  
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SUPAG06 Simulation Challenges for eRHIC Beam-Beam Study electron, simulation, damping, cavity 99
 
  • Y. Luo
    BNL, Upton, Long Island, New York, USA
  • Y. Hao
    FRIB, East Lansing, USA
  • J. Qiang
    LBNL, Berkeley, California, USA
  • Y. Roblin
    JLab, Newport News, Virginia, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The 2015 Nu­clear Sci­ence Ad­vi­sory Com­mit­tee Long Rang Plan iden­ti­fied the need for an elec­tron-ion col­lider fa­cil­ity as a gluon mi­cro­scope with ca­pa­bil­i­ties be­yond those of any ex­ist­ing ac­cel­er­a­tor com­plex. To reach the re­quired high en­ergy, high lu­mi­nos­ity, and high po­lar­iza­tion, the eRHIC de­sign based on the ex­ist­ing heady ion and po­lar­ized pro­ton col­lider RHIC adopts a very small beta-func­tion at the in­ter­ac­tion point, a high col­li­sion rep­e­ti­tion rate, and a novel hadron cool­ing scheme. Col­li­sion with a full cross­ing angle of 22 mrad and crab cav­i­ties for both elec­tron and pro­ton rings are re­quired. In this ar­ti­cle, we will pre­sent the high pri­or­ity R&D items re­lated to beam-beam in­ter­ac­tion for the cur­rent eRHIC de­sign, the sim­u­la­tion chal­lenges, and our plans to ad­dress them. 		 
slides icon Slides SUPAG06 [2.395 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAG06  
About • paper received ※ 18 October 2018       paper accepted ※ 03 December 2018       issue date ※ 26 January 2019  
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SUPAG09 Beam Dynamics Simulations of Medical Cyclotrons and Beam Transfer Lines at IBA cyclotron, extraction, closed-orbit, electron 104
 
  • J. van de Walle, E. Forton, W.J.G.M. Kleeven, J. Mandrillon, V. Nuttens, E. Van Der Kraaij
    IBA, Louvain-la-Neuve, Belgium
  
  The com­pany Ion Beam Ap­pli­ca­tions (IBA), based in Bel­gium, is spe­cial­ized in the de­sign and fab­ri­ca­tion of cy­clotrons for med­ical ap­pli­ca­tions since more than 30 years. Two main classes of cy­clotrons can be dis­tin­guished : cy­clotrons for ra­dio­pharma pro­duc­tion (3 MeV up to 70 MeV pro­ton beams) and cy­clotrons used in pro­ton ther­apy (230 MeV pro­ton beam). In this con­tri­bu­tion, the de­vel­op­ments of com­pu­ta­tional tools to sim­u­late beam dy­nam­ics in the va­ri­ety of cy­clotrons and as­so­ci­ated beam lines will be de­scribed. The main code for sim­u­lat­ing the cy­clotron beam dy­nam­ics is the ’Ad­vanced Orbit Code’ (AOC) [1]. Ex­am­ples will be shown of beam dy­nam­ics stud­ies in the newly de­signed Cy­clone KIUBE (18 MeV pro­ton cy­clotron for PET iso­tope pro­duc­tion), the Cy­clone230 and the su­per­con­duct­ing syn­chro-cy­clotron (S2C2), both 230 MeV pro­ton cy­clotrons for pro­ton ther­apy. Cal­cu­lated beam emit­tances, res­o­nance cross­ings and beam losses will be shown and their im­pact on the per­for­mance of the ma­chine will be high­lighted. A strong em­pha­sis will be put on the beam prop­er­ties from the S2C2 (pro­ton ther­apy cy­clotron), since un­ex­pected ex­tracted pro­ton beam was dis­cov­ered and ex­plained by de­tailed sim­u­la­tions [2] and the beam prop­er­ties serve as input to sub­se­quent beam line sim­u­la­tion tools. Sev­eral tools have been de­vel­oped to sim­u­late and de­sign trans­fer lines cou­pled to the cy­clotrons. In ra­dio­pharma ap­pli­ca­tions beam losses along the beam­line and the beam size on the pro­duc­tion tar­get are cru­cial, since beam in­ten­si­ties are high and ra­di­a­tion dam­age can be con­sid­er­able. In pro­ton ther­apy, beam in­ten­si­ties are very low but the con­straints on the beam po­si­tion, drift (in po­si­tion, en­ergy and in­ten­sity) and size at the pa­tient level are very tight. In both cases a strong pre­dic­tive power of the cal­cu­lated beam prop­er­ties in the trans­fer lines is needed. The com­pact pro­ton gantry (CGTR) cou­pled with the S2C2 in the Pro­teu­sONE pro­ton ther­apy sys­tem will be shown in de­tail. The CGTR is a s
[1] W. Kleeven et al., IPAC 2016 proceedings, TUPOY002
[2] J. Van de Walle et al., Cyclotrons2016 proceedings, THB01 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAG09  
About • paper received ※ 19 October 2018       paper accepted ※ 04 December 2018       issue date ※ 26 January 2019  
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SUPAG10 Design Study of a Fast Kicker Magnet Applied to the Beamline of a Proton Therapy Facility kicker, simulation, vacuum, cyclotron 110
 
  • W.J. Han
    Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China
  • X. Liu, B. Qin
    HUST, Wuhan, People’s Republic of China
  
  Funding: Huazhong University Of Science And Technology
A pro­ton ther­apy fa­cil­ity based on an isochro­nous su­per­con­duct­ing cy­clotron is under de­vel­op­ment in HUST (Huazhong Uni­ver­sity of Sci­ence and Tech­nol-ogy). A fast kicker mag­net will be in­stalled in the up-stream of the de­grader to per­form the beam switch func­tion by kick­ing the pro­ton beam to the down-stream beam stop. The ris­ing and falling time of the kicker is about 100us, and the max­i­mum rep­e­ti­tion rate is 500Hz. This paper in­tro­duces sim­u­la­tion and opti-miza­tion of the eddy cur­rent and dy­namic mag­netic field of the fast kicker, by using FEM code OPERA-3D. For kicker ma­te­ri­als, lam­i­nated steel and soft fer­rite are com­pared and the MnZn fer­rite is cho­sen. De­sign-ing con­sid­er­a­tions in­cludes the eddy cur­rent ef­fect, field hys­tere­sis, and me­chan­i­cal struc­ture of the kicker will also be in­tro­duced. 		 
slides icon Slides SUPAG10 [1.184 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-SUPAG10  
About • paper received ※ 19 October 2018       paper accepted ※ 04 December 2018       issue date ※ 26 January 2019  
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MOPAF02 Realistic Modeling of the Muon g-2 Experiment Beamlines at Fermilab simulation, target, storage-ring, experiment 134
 
  • D. Tarazona, M. Berz, K. Makino
    MSU, East Lansing, Michigan, USA
  • D. Stratakis, M.J. Syphers
    Fermilab, Batavia, Illinois, USA
  • M.J. Syphers
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: This work is supported by the U.S. Department of Energy under Award No. DE-FG02-08ER41546, by the PhD Accelerator Program at Fermilab, and by a Strategic Partnership Grant from the MSU Foundation.
The main goal of the Muon g-2 Ex­per­i­ment at Fer­mi­lab (E989) is to mea­sure the muon anom­alous mag­netic mo­ment (a, also dubbed as the "anom­aly’’) to un­prece­dented pre­ci­sion. This new mea­sure­ment will allow to test the com­plete­ness of the Stan­dard Model (SM) and to val­i­date other the­o­ret­i­cal mod­els be­yond the SM. Sim­u­la­tions of the beam­lines from the pion pro­duc­tion tar­get to the en­trance of the g-2 Stor­age Ring using COSY IN­FIN­ITY con­tribute to the un­der­stand­ing and char­ac­ter­i­za­tion of the muon beam pro­duc­tion in re­la­tion to the sta­tis­ti­cal and sys­tem­at­ics un­cer­tain­ties of the E989 mea­sure­ment. The ef­fect of non­lin­earites from fringe fields and high-or­der con­tri­bu­tions on the beam de­liv­ery sys­tem per­for­mance are con­sid­ered, as well as in­ter­ac­tions with the beam­line el­e­ments aper­tures, par­ti­cle decay chan­nels, spin dy­nam­ics, and beam­line mis­align­ments. 		 
slides icon Slides MOPAF02 [14.110 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-MOPAF02  
About • paper received ※ 22 October 2018       paper accepted ※ 28 January 2019       issue date ※ 26 January 2019  
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