Keyword: multipole
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MOPAB253 Comparison of Transfer Map Derivation Methods for Static Magnetic Fields quadrupole, lattice, extraction, operation 799
 
  • J.A. Crittenden, S. Wang
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Funding: This work is supported by National Science Foundation award numbers DMR-1829070 and PHY-1757811.
We com­pare meth­ods for de­riv­ing trans­fer maps for sta­tic mag­netic fields, in­clud­ing field-map track­ing and track­ing el­e­ments de­fined by mul­ti­pole con­tent. Build­ing on prior work on quan­ti­ta­tive eval­u­a­tion of the ac­cu­racy of fi­nite-el­e­ment mod­els used to pro­duce field maps, we as­sess the trade­offs be­tween com­put­ing time and fi­delity to the un­der­ly­ing mag­netic field, in­clud­ing fringe fields, of the var­i­ous ap­prox­i­mate meth­ods. We il­lus­trate our ap­proach using the ex­am­ple of elec­tro­mag­nets in the south arc of the 6-GeV Cor­nell High En­ergy Syn­chro­tron Source, which have been op­er­at­ing since 2019. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB253  
About • paper received ※ 19 May 2021       paper accepted ※ 18 June 2021       issue date ※ 13 August 2021  
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MOPAB264 Commissioning of the DESIR High-Resolution Separator at CENBG emittance, MMI, dipole, quadrupole 841
 
  • J. Michaud, P. Alfaurt, A. Balana, B. Blank, L. Daudin, T. Kurtukian-Nieto, S. Leblanc, L.S. Serani
    CENBG, Gradignan, France
  • F. Méot
    BNL, Upton, New York, USA
  • F. Varenne
    GANIL, Caen, France
  
  DESIR is the low-en­ergy part of the SPI­RAL2 ISOL fa­cil­ity under con­struc­tion at GANIL. The high-res­o­lu­tion mass sep­a­ra­tor (HRS) in­cluded in DESIR is a 180 de­gree sym­met­ric on­line sep­a­ra­tor with two 90 de­gree mag­netic di­pole sec­tions arranged with elec­tro­sta­tic quadrupoles, sex­tupoles and a mul­ti­pole on the mid plane. The HRS is now com­pletely mounted at CENBG and under com­mis­sion­ing for the next 2 to 3 years be­fore its trans­fer at the en­trance of the DESIR fa­cil­ity. The ob­jec­tive is to test, char­ac­terise and cor­rect all HRS el­e­ments con­tribut­ing to the higher order aber­ra­tion by per­form­ing ex­per­i­men­tal mea­sure­ments and com­par­ing them with the re­sults from dif­fer­ent sim­u­la­tion tools. The re­cently mounted pep­per­pot-type emit­tance-me­ter will allow us to ob­serve the emit­tance fig­ures and dy­nam­i­cally tune the mul­ti­pole to im­prove the op­ti­cal pa­ra­me­ters of the HRS. We will pre­sent the first re­sults con­cern­ing the hexa­p­o­lar cor­rec­tion with the mul­ti­pole, the as­so­ci­ated emit­tance mea­sure­ments and the res­o­lu­tion cur­rently achieved.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB264  
About • paper received ※ 19 May 2021       paper accepted ※ 08 June 2021       issue date ※ 10 August 2021  
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TUPAB094 Multi-Start Foil Wound Solenoids for Multipole Suppression solenoid, emittance, simulation, quadrupole 1596
 
  • N. Majernik, A. Fukasawa, J.B. Rosenzweig, A. Suraj
    UCLA, Los Angeles, California, USA
  
  Funding: National Science Foundation Grant No. PHY-1549132 - CBB, DE-SC0020409
So­le­noids for beam trans­port are typ­i­cally wound he­li­cally, with each layer of wire being laid down on top of the pre­vi­ous, or as "pan­cakes" where the wire is wound ra­di­ally in be­fore cross­ing over and wind­ing out. Both of these ap­proaches break ro­ta­tional sym­me­try and in­tro­duce higher-or­der mul­ti­pole mo­ments which can be dele­te­ri­ous to beam emit­tance. For high bright­ness beams, this can be par­tic­u­larly prob­lem­atic. To this end, a so­le­noid em­ploy­ing multi-start foil wind­ings is sim­u­lated and com­pared to con­ven­tional choices. With ap­pro­pri­ate de­sign, this ap­proach can for­bid cer­tain mul­ti­poles by sym­me­try. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB094  
About • paper received ※ 19 May 2021       paper accepted ※ 20 July 2021       issue date ※ 15 August 2021  
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TUPAB238 Algorithm to Analyze Complex Magnetic Structures Using a Tube Approach quadrupole, HOM, octupole, sextupole 1995
 
  • B. Riemann, M. Aiba
    PSI, Villigen PSI, Switzerland
  
  Mod­ern syn­chro­tron light sources often re­quire so­phis­ti­cated mul­ti­pole field dis­tri­b­u­tions that need to be re­al­ized by com­plex mag­net struc­tures. To pre-val­i­date these mag­net struc­tures via sim­u­la­tions, the ex­trac­tion pro­ce­dure needs to out­put stan­dard mul­ti­poles as well as fringe ef­fects. The ap­proach pre­sented in this man­u­script uses a vol­u­met­ric grid map of the mag­netic flux den­sity as input. After com­pu­ta­tion of the ref­er­ence tra­jec­tory (leapfrog in­te­gra­tion), a large lin­ear sys­tem is solved to com­pute trans­verse poly­no­mial co­ef­fi­cients of the mag­netic scalar po­ten­tial in a se­ries of in­ter­con­nected thin cylin­ders (lin­ear basis func­tions) along with that ref­er­ence. The im­port of these co­ef­fi­cients into a lat­tice sim­u­la­tion is dis­cussed using a mod­i­fi­ca­tion of the track­ing code Tracy. The shown ap­proach is rou­tinely used to check mod­els of SLS 2.0 mag­nets for their prop­er­ties.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB238  
About • paper received ※ 18 May 2021       paper accepted ※ 17 June 2021       issue date ※ 31 August 2021  
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TUPAB369 A Fast Non-Linear Model for the EBS Combined Sextupole-Corrector Magnets sextupole, SRF, dipole, quadrupole 2381
 
  • G. Le Bec
    ESRF, Grenoble, France
  
  Cor­rec­tor are often in­te­grated in higher order ac­cel­er­a­tor mag­nets. In the new ESRF-EBS stor­age ring, the sex­tupoles in­clude ad­di­tional wind­ings al­low­ing for di­pole and skew quadru­pole cor­rec­tions. The ac­cu­rate mod­eliza­tion of such mag­nets is not as triv­ial as it may ap­pear, due to their non-lin­ear­i­ties and to the crosstalk be­tween their chan­nels. Chang­ing any cor­rec­tor cur­rent in­duce non-lin­ear er­rors in the other cor­rec­tor chan­nels and in the main sex­tu­pole strength, mak­ing dif­fi­cult the trim­ming of the mag­nets. A model based on a non-lin­ear ex­ci­ta­tion curve and qua­dratic con­tri­bu­tions from cor­rec­tor cur­rents was de­vel­oped. This model is very fast and was in­cluded in the ac­cel­er­a­tor con­trol sys­tem to com­pute the cor­rec­tor cur­rents in real-time. It was tested against 3D mag­netic sim­u­la­tions and mag­netic mea­sure­ments and com­pared to a sim­pler ma­trix-based model.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB369  
About • paper received ※ 17 May 2021       paper accepted ※ 31 August 2021       issue date ※ 22 August 2021  
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TUPAB378 Superconducting Dipole Magnets for the SIS100 Synchrotron dipole, synchrotron, operation, simulation 2401
 
  • F. Kaether, P. Aguar Bartolome, A. Bleile, G. Golluccio, J. Ketter, P. Kosek, F. Kurian, V. Marusov, J.P. Meier, S.S. Mohite, C. Roux, P.J. Spiller, K. Sugita, A. Szwangruber, P.B. Szwangruber, A. Warth, H.G. Weiss
    GSI, Darmstadt, Germany
  
  The Fa­cil­ity for An­tipro­ton and Ion Re­search (FAIR) is cur­rently under con­struc­tion at GSI Darm­stadt, Ger­many. For its main ac­ce­lara­tor, the SIS100 syn­chro­tron, 110 su­per­con­duct­ing di­pole mag­nets has been pro­duced and ex­ten­sively tested. The fast-ramped Nu­clotron-type su­per­fer­ric dipoles were man­u­fac­tured with high ef­fort re­gard­ing a pre­cise mag­netic field which could be proven by mag­netic field mea­sure­ments with high ac­cu­racy. Sta­ble op­er­a­tion con­di­tions at 4.5 K were achieved in­clud­ing an ex­cel­lent quench be­hav­iour and pre­cise geo­met­ri­cal and elec­tri­cal prop­er­ties. An overview on de­sign, pro­duc­tion, op­er­a­tion, tests and mea­sure­ment re­sults will be given.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB378  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 10 August 2021  
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TUPAB383 Magnetic Field Performance of the First Serial Quadrupole Units for the SIS100 Synchrotron of FAIR quadrupole, synchrotron, cryogenics, heavy-ion 2417
 
  • V.V. Borisov, O. Golubitsky, H.G. Khodzhibagiyan, B.Yu. Kondratiev, M.M. Shandov
    JINR, Dubna, Moscow Region, Russia
  • E.S. Fischer, M.A. Kashunin, S.A. Kostromin, I. Nikolaichuk, T. Parfylo, A.V. Shemchuk, D.A. Zolotykh
    JINR/VBLHEP, Dubna, Moscow region, Russia
  
  The FAIR pro­ject is a new in­ter­na­tional ac­cel­er­a­tor com­plex, cur­rently under con­struc­tion in Darm­stadt, Ger­many. The heavy-ion syn­chro­tron SIS100 is the main ac­cel­er­a­tor of the whole com­plex. It will pro­vide high-in­ten­sity pri­mary beams with a mag­netic rigid­ity of 100 Tm and a max­i­mum rep­e­ti­tion rate up to 4 Hz. The se­ries pro­duc­tion and test­ing of su­per­con­duct­ing quadru­pole units began in 2020 at JINR, Dubna. The first batch of units was de­liv­ered to Ger­many in Sep­tem­ber 2020. Each unit is sub­jected to a com­pre­hen­sive test­ing pro­gram both at am­bi­ent tem­per­a­ture and under cryo­genic con­di­tions. We pre­sent the per­for­mance char­ac­ter­is­tics of the first quadru­pole units (con­sist­ing of a lat­tice quadru­pole mag­net and cor­rect­ing mag­net me­chan­i­cally and hy­drauli­cally cou­pled to a quadru­pole). The main at­ten­tion is paid to the field qual­ity of the se­ries of 6 quadrupoles mea­sured by the same probe.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB383  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 01 September 2021  
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TUPAB387 Superconducting Solenoid Field Measurement and Optimization solenoid, quadrupole, emittance, gun 2425
 
  • S. Ma, A. Arnold, P. Murcek, A.A. Ryzhov, J. Schaber, J. Teichert, R. Xiang, P.Z. Zwartek
    HZDR, Dresden, Germany
  • H.J. Qian
    DESY Zeuthen, Zeuthen, Germany
  
  The so­le­noid is a sig­nif­i­cant part of an elec­tron in­jec­tor to pro­vide a proper fo­cus­ing, and pre­serve the beam pro­jected emit­tance. A su­per­con­duct­ing so­le­noid is ap­plied for the SRF pho­toin­jec­tor at HZDR. The so­le­noid it­self can de­grade elec­tron beam qual­ity due to mag­netic field im­per­fec­tions like mul­ti­pole com­po­nents. In order to de­ter­mine the field aber­ra­tions in the so­le­noid, we mea­sured the su­per­con­duct­ing so­le­noid mag­netic field in the cry­omod­ule. A sim­ple and ef­fec­tive method is used to an­a­lyze the mul­ti­pole field com­po­nents, which will be pre­sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB387  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 20 August 2021  
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WEPAB006 EIC Crab Cavity Multipole Analysis cavity, dynamic-aperture, collider, simulation 2589
 
  • Q. Wu, Y. Luo, B.P. Xiao
    BNL, Upton, New York, USA
  • S.U. De Silva
    ODU, Norfolk, Virginia, USA
  • J.A. Mitchell
    CERN, Geneva, Switzerland
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
Crab cav­i­ties are spe­cial­ized RF de­vices de­signed for col­lid­ers tar­get­ing high lu­mi­nosi­ties. It is a straight­for­ward so­lu­tion to re­trieve head-on col­li­sion with cross­ing angle ex­ist­ing to fast sep­a­rate both beams after col­li­sion. The Elec­tron Ion Col­lider (EIC) has a cross­ing angle of 25 mrad, and will use local crab­bing to min­i­mize the dy­namic aper­ture re­quire­ment through­out the rings. The cur­rent crab cav­ity de­sign for the EIC lacks axial sym­me­try. There­fore, their higher order com­po­nents of the fun­da­men­tal de­flect­ing mode have a po­ten­tial of af­fect­ing the long-term beam sta­bil­ity. We pre­sent here the mul­ti­pole analy­sis and pre­lim­i­nary par­ti­cle track­ing re­sults from the cur­rent crab cav­ity de­sign. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB006  
About • paper received ※ 18 May 2021       paper accepted ※ 25 June 2021       issue date ※ 16 August 2021  
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WEPAB080 Near Threshold Pion Photoproduction on Deuterons photon, experiment, polarization, scattering 2775
 
  • V. Shastri, V. Aswathi, S.P. Shilpashree
    Christ University, School of Engineering and Technology, Bangalore, India
  
  The study of pho­to­pro­duc­tion of mesons is a prime tool in un­der­stand­ing the prop­er­ties of strong in­ter­ac­tions. The only pho­to­pro­duc­tion re­ac­tion on deuteron with two-body final state is co­her­ent pion pho­to­pro­duc­tion re­ac­tion. Sev­eral the­o­ret­i­cal stud­ies are being car­ried out on the pion pho­to­pro­duc­tion on deuterons since sev­eral decades. On the ex­per­i­men­tal side, the ac­cel­er­a­tor and de­tec­tor tech­nol­ogy has im­proved the de­vel­op­ments. In the re­cent years, mea­sure­ments of ten­sor an­a­lyz­ing pow­ers as­so­ci­ated with co­her­ent and in­co­her­ent pion pho­to­pro­duc­tion are also being car­ried out at the VEPP-3 elec­tron stor­age ring. In one of the re­cent mea­sure­ments, Rachek et al"*" have ob­served dis­crep­ancy be­tween the­ory and ex­per­i­ment at higher pho­ton en­er­gies and have sug­gested for im­prove­ment of the the­o­ret­i­cal mod­els. In a more re­cent analy­sis,"**" the role of D-wave com­po­nent on spin asym­me­tries have been iden­ti­fied. In view of these de­vel­op­ments, the pur­pose of the pre­sent con­tri­bu­tion is to study co­her­ent pion pho­to­pro­duc­tion on deuterons using model in­de­pen­dent ir­re­ducible ten­sor for­mal­ism de­vel­oped ear­lier to study the pho­to­dis­in­te­gra­tion of deuterons."***"
*I A Rachek et al., Few-Body Syst., 58, 29 (2017)
**H M Al Ghamdi et al, Brazillian Journal of Physics, 50, 615 (2020)
*** G Ramachandran, S P Shilpashree Phys. Rev. C 74, 052801(R) (2006) 		 
poster icon Poster WEPAB080 [0.203 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB080  
About • paper received ※ 29 May 2021       paper accepted ※ 01 July 2021       issue date ※ 16 August 2021  
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WEPAB119 Beam Injection with a Pulsed Nonlinear Magnet Into the HALF Storage Ring injection, storage-ring, lattice, dynamic-aperture 2878
 
  • G. Liu, W. Li, L. Wang, P.N. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  The non­lin­ear op­tics of the HALF stor­age ring are well op­ti­mized to make it pos­si­ble to in­ject the beam with the pulsed mul­ti­pole in­jec­tion scheme. In this paper, the in­jec­tion scheme is stud­ied with an in­no­v­a­tively de­signed pulsed non­lin­ear mag­net. The lay­out and pa­ra­me­ters of the in­jec­tion sys­tem are well de­signed based on the ac­cep­tance analy­sis. The in­jec­tion process is sim­u­lated with par­ti­cle track­ing is pre­sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB119  
About • paper received ※ 20 May 2021       paper accepted ※ 29 July 2021       issue date ※ 13 August 2021  
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WEPAB125 Acceptance Analysis Method for the Scheme Design of Multipole Kicker Injection injection, kicker, storage-ring, simulation 2900
 
  • P.N. Wang, W. Li, G. Liu, L. Wang
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  A pulsed mul­ti­pole kicker has zero mag­netic field at the cen­ter, con­se­quently, this in­jec­tion scheme can be trans­par­ent to the stored beam and users. In gen­eral, mul­ti­pole kicker in­jec­tion schemes are de­rived from the method of phase space analy­sis. In this paper, a new method of ac­cep­tance analy­sis based on multi-par­ti­cles track­ing is pro­posed. Using this method, we can quickly ob­tain mul­ti­ple kicker in­jec­tion schemes and eas­ily make ad­just­ments to them. The de­tails of this method are pre­sented and we apply it to the HALF stor­age ring as an ex­am­ple. A se­ries of track­ing sim­u­la­tions are car­ried out and re­sults are also dis­cussed.  
poster icon Poster WEPAB125 [0.930 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB125  
About • paper received ※ 18 May 2021       paper accepted ※ 09 June 2021       issue date ※ 13 August 2021  
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WEPAB259 Impact of the Magnet Alignment and Field Errors on the Output Uniform Beam at the DONES HEBT Line target, neutron, octupole, linac 3251
 
  • C. Oliver, A. Ibarra, J. Mollá, I. Podadera, R. Varela
    CIEMAT, Madrid, Spain
  • H. Dzitko
    F4E, Germany
  • O. Nomen, D. Sánchez-Herranz
    IREC, Sant Adria del Besos, Spain
  
  Funding: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053
IFMIF-DONES will be a fa­cil­ity de­voted to study the degra­da­tion of ad­vanced ma­te­ri­als for op­er­a­tion of fu­sion re­ac­tors. Mo­ti­vated by the need of op­ti­miz­ing the neu­tron ir­ra­di­a­tion to the ma­te­ri­als sam­ples, the HEBT line of the deuteron DONES (DEMO Ori­ented Neu­tron Source) ac­cel­er­a­tor is based on non-lin­ear mag­netic fields. By using oc­tupoles and do­de­capoles mag­nets, it is pos­si­ble to shape the beam pro­file to achieve the de­manded rec­tan­gu­lar uni­form dis­tri­b­u­tion across the flat top of the beam pro­file, with high edge peaks in the hor­i­zon­tal di­rec­tion. Spe­cial op­tics con­di­tions are ob­tained with a proper set­ting of quadru­pole mag­nets to min­i­mize the x-y cou­pling. Ad­di­tion­ally, the high beam power (5 MW, for a 125 mA, 40 MeV deuteron beam) in con­junc­tion with the huge space charge makes chal­leng­ing the HEBT line de­sign to avoid non-con­trolled losses, ex­cept in the de­voted scrap­ers. A com­pre­hen­sive beam dy­nam­ics analy­sis has been made using TraceWin code. It in­cludes ex­ten­sive error stud­ies to de­fine tol­er­ances and ver­ify the ro­bust­ness of the de­sign with re­spect to mag­net mis­align­ment, power sup­ply in­sta­bil­i­ties and in­jec­tion pa­ra­me­ters. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB259  
About • paper received ※ 19 May 2021       paper accepted ※ 26 July 2021       issue date ※ 17 August 2021  
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THPAB013 Magnetic Measurements at Warm of the First FCC-ee Final Focus Quadrupole Prototype quadrupole, induction, simulation, factory 3777
 
  • M. Koratzinos
    MIT, Cambridge, Massachusetts, USA
  • G. Kirby, M. Liebsch, C. Petrone
    CERN, Geneva, Switzerland
  
  The first FCC-ee final focus quadru­pole pro­to­type has been de­signed, man­u­fac­tured, as­sem­bled and tested at warm. The pro­to­type is a sin­gle aper­ture quadru­pole mag­net of the CCT type. One edge of the mag­net was de­signed with local mul­ti­pole can­cel­la­tion, whereas the other was left with the con­ven­tional de­sign. An op­ti­mized ro­tat­ing in­duc­tion-coil sen­sor was used. A tech­nique was de­vel­oped to take into ac­count field dis­tor­tions due to the en­vi­ron­ment of the test and dis­tin­guish them from mag­net ef­fects, demon­strat­ing an ex­cel­lent field qual­ity for the pro­to­type.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB013  
About • paper received ※ 11 May 2021       paper accepted ※ 28 July 2021       issue date ※ 16 August 2021  
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THPAB077 Magnetic Shims Studies for APS-U Hybrid Permanent Magnet Undulators undulator, simulation, GUI, quadrupole 3941
 
  • Y. Piao, R.J. Dejus, M.F. Qian, I. Vasserman, J.Z. Xu
    ANL, Lemont, Illinois, USA
  
  Funding: Work supported by U.S. Department of Energy, Office of Science, under contract number DE-AC02-06CH11357
For the newly de­signed and fab­ri­cated APS Up­grade (APS-U) hy­brid per­ma­nent mag­net un­du­la­tors (HPMUs), the de­vel­op­ment of mag­netic shims has been crit­i­cal to suc­cess­fully tun­ing the un­du­la­tors to meet the tight APS-U physics re­quire­ments. Dif­fer­ent types of side and sur­face shims have been de­vel­oped and ap­plied for this pur­pose. The side shims are pri­mar­ily used for tra­jec­tory tun­ing, and the sur­face shims are for phase and mul­ti­pole tun­ing as well as tra­jec­tory tun­ing. Cur­rent de­sign, ap­pli­ca­tions, and mea­sure­ment of the shims for the newly de­signed and fab­ri­cated APS28 (28 mm pe­riod) un­du­la­tors are pre­sented in this paper. 		 
poster icon Poster THPAB077 [0.531 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB077  
About • paper received ※ 20 May 2021       paper accepted ※ 18 June 2021       issue date ※ 27 August 2021  
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THPAB227 MACH-B: Fast Multipole Method Approaches in Particle Accelerator Simulations for the Computational and Intensity Frontiers simulation, framework, embedded, space-charge 4237
 
  • M.H. Langston, R. Lethin, P.D. Letourneau, J. Wei
    Reservoir Labs, New York, USA
  • M.J. Morse
    Courant Institute of Mathematical Sciences, New York University, New York, USA
  
  Funding: U.S. Department of Energy DOE SBIR Phase I Project DE-SC0020934
The MACH-B (Mul­ti­pole Ac­cel­er­a­tor Codes for Hadron Beams) pro­ject is de­vel­op­ing a Fast Mul­ti­pole Method (FMM**)-based tool for higher fi­delity mod­el­ing of par­ti­cle ac­cel­er­a­tors for high-en­ergy physics within the next gen­er­a­tion of Fer­mi­lab’s Syn­er­gia* sim­u­la­tion pack­age. MACH-B in­cor­po­rates (1) highly-scal­able, high-per­for­mance and gen­er­ally-ap­plic­a­ble FMM-based al­go­rithms to ac­cu­rately model space-charge ef­fects in high-in­ten­sity hadron beams and (2) bound­ary in­te­gral ap­proaches to han­dle sin­gu­lar ef­fects near the beam pipe using ad­vanced quad­ra­tures. MACH-B will allow for more com­plex beam dy­nam­ics sim­u­la­tions that more ac­cu­rately cap­ture bunch ef­fects and pre­dict beam loss. Fur­ther, by in­tro­duc­ing an ab­strac­tion layer to hide FMM im­ple­men­ta­tion and par­al­leliza­tion com­plex­i­ties, MACH-B re­moves one of the key im­ped­i­ments to the adop­tion of FMMs by the ac­cel­er­a­tor physics com­mu­nity.
* J. Amundson et al. "Synergia: An accelerator modeling tool with 3-D space charge". J.C.P. 211.1 (2006) 229-248.
** L. Greengard. "Fast algorithms for classical physics". Science (Aug 1994) 909-914. 		 
poster icon Poster THPAB227 [0.984 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB227  
About • paper received ※ 19 May 2021       paper accepted ※ 14 July 2021       issue date ※ 27 August 2021  
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THPAB229 Energy-Binning Fast Multipole Method for Electron Injector Simulations space-charge, simulation, electron, cathode 4244
 
  • S.A. Schmid, H. De Gersem, E. Gjonaj
    TEMF, TU Darmstadt, Darmstadt, Germany
  
  In a high bril­liance elec­tron in­jec­tor, small beam en­ergy and large charge den­sity give rise to strong space charge ef­fects. Fur­ther­more, a large rel­a­tive en­ergy spread dur­ing the beam gen­er­a­tion mod­i­fies the space charge in­ter­ac­tion be­tween dif­fer­ent re­gions of the par­ti­cle bunch. There­fore, mod­el­ing the phase space evo­lu­tion in an elec­tron in­jec­tor re­quires a nu­mer­i­cally ef­fi­cient par­ti­cle track­ing code that can han­dle space charge in­ter­ac­tions of spa­tially and en­er­get­i­cally strongly in­ho­mo­ge­neous par­ti­cle dis­tri­b­u­tions. We im­ple­mented an en­ergy-bin­ning scheme for a mesh­less fast mul­ti­pole method (FMM). The en­ergy-bin­ning ap­prox­i­mates the mo­men­tum dis­tri­b­u­tion of the beam by as­sign­ing par­ti­cles to adap­tive tree struc­tures de­fined at dif­fer­ent Lorentz frames. Based on the tree struc­tures, the FMM com­putes a hi­er­ar­chi­cal ap­prox­i­ma­tion for the space charge in­ter­ac­tion of the par­ti­cle bunch. We use the en­ergy-bin­ning FMM to sim­u­late the beam gen­er­a­tion in the pho­toin­jec­tor of the Eu­ro­pean XFEL de­vel­oped at DESY-PITZ. Fur­ther­more, we pre­sent nu­mer­i­cal con­ver­gence and per­for­mance stud­ies and com­pare the sim­u­la­tion re­sults to di­rect par­ti­cle-par­ti­cle meth­ods.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB229  
About • paper received ※ 19 May 2021       paper accepted ※ 12 July 2021       issue date ※ 25 August 2021  
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FRXB04 Newly Development of Ceramics Chamber with Integrated Pulsed Magnet for Super-Narrow Bore in KEK-PF injection, kicker, dipole, vacuum 4524
 
  • C. Mitsuda, K. Harada, Y. Kobayashi, S. Nagahashi, T. Nogami, T. Obina, R. Takai, H. Takaki, T. Uchiyama, A. Ueda
    KEK, Ibaraki, Japan
  • K. Hamaji, K. Iwamoto, A. Sasagawa, A. Yokoyama
    KYOCERA Corporation, Higashiomi-city, Shiga, Japan
  • Y. Lu
    Sokendai, Ibaraki, Japan
  
  Ce­ram­ics cham­ber with in­te­grated pulsed mag­net (CCiPM) is a new air-core type mag­net that has a plan to be used as a mul­ti­pole in­jec­tion mag­net, a di­pole in­jec­tion kicker, and a fast cor­rec­tion kicker in the next-gen­er­a­tion light source. The mag­net coils are im­planted com­pletely into the thick­ness of cylin­dri­cal ce­ramic and in­te­grated with ce­ramic struc­turally. The first CCiPM was de­vel­oped for an in­ter­nal di­am­e­ter of 60 mm as a mag­net bore to es­tab­lish the basic pro­duc­tion tech­niques. The tech­nique has been en­hanced to re­al­ize nar­rower bore over 3 years, and fi­nally, the achieved in­ter­nal di­am­e­ters were 40 and 30 mm in newly de­vel­oped CCiPM. These super small bores have an ex­pec­ta­tion to con­form to the size of the vac­uum beam duct in the ring of a fu­ture light source. New CCiPMs are under the off-line test to con­firm the vac­uum dura­bil­ity, elec­tri­cal char­ac­ter­is­tics, and mag­netic per­for­mance, and the beam test for the CCiPM with 30 mm di­am­e­ter has also pro­ceeded in par­al­lel. The points of pro­duc­tion tech­nique and the re­cent re­sults of the off-line test will be pre­sented in this con­fer­ence.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-FRXB04  
About • paper received ※ 19 May 2021       paper accepted ※ 19 July 2021       issue date ※ 31 August 2021  
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