Keyword: permanent-magnet
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TUXC07 Modified Halbach Magnets for Emerging Accelerator Applications quadrupole, dipole, collider, electron 1315
 
  • S.J. Brooks
    BNL, Upton, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
The orig­i­nal cir­cu­lar Hal­bach mag­net de­sign cre­ates a strong pure mul­ti­pole field from per­ma­nent mag­net pieces with­out in­ter­ven­ing iron. This de­sign has been ex­tended re­cently at the CBETA 4-turn ERL, whose re­turn loop in­cludes com­bined-func­tion (di­pole+quadru­pole) Hal­bach-de­rived mag­nets, plus a mod­u­lar sys­tem of tun­ing shims to im­prove all 216 mag­nets’ rel­a­tive field ac­cu­racy to bet­ter than 10-3. This paper de­scribes fur­ther mod­i­fi­ca­tions of the Hal­bach de­sign en­able a larger range of ac­cel­er­a­tor ap­pli­ca­tions in the fu­ture: (1) open-mid­plane de­signs to allow syn­chro­tron ra­di­a­tion in light sources and other high-en­ergy elec­tron rings, ERLs or RLAs to es­cape. (2) Quadru­pole mag­nets with an oval aper­ture allow larger gra­di­ents than a cir­cu­lar aper­ture, pro­vided the beam is more ex­tended in one axis than the other, as usual for a quadru­pole in a fo­cussing sys­tem. These can be used in com­pact hadron ther­apy gantries. (3) New col­lider com­plexes often re­quire mul­ti­ple rings for ac­cel­er­a­tion or top-up, ac­cu­mu­la­tion, col­li­sion and cool­ing. Multi-aper­ture per­ma­nent mag­nets are pos­si­ble to cheaply and com­pactly build ring sys­tems with sev­eral sta­ble or­bits sep­a­rated by a few cm. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUXC07  
About • paper received ※ 14 May 2021       paper accepted ※ 08 July 2021       issue date ※ 23 August 2021  
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TUPAB028 Permanent Magnets Future Electron Ion Colliders at RHIC and LHeC linac, electron, focusing, collider 1401
 
  • D. Trbojevic, S.J. Brooks, V. Litvinenko, T. Roser
    BNL, Upton, New York, USA
  • G.H. Hoffstaetter
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • V. Litvinenko
    Stony Brook University, Stony Brook, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
We pre­sent a new ’green en­ergy’ ap­proach to the En­ergy Re­cov­ery Linac (ERL) and Re­cir­cu­lat­ing Linac Ac­cel­er­a­tors (RLA) for the fu­ture Elec­tron Ion Col­lid­ers (EIC) using sin­gle beam line made of very strong fo­cus­ing com­bined func­tion per­ma­nent mag­nets and the Fixed Field Al­ter­nat­ing Lin­ear Gra­di­ent (FFA-LG) prin­ci­ple. We are bas­ing our de­sign on re­cent very suc­cess­ful com­mis­sion­ing re­sults of the Cor­nell Uni­ver­sity and Brookhaven Na­tional Lab­o­ra­tory ERL Test Ac­cel­er­a­tor. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB028  
About • paper received ※ 17 May 2021       paper accepted ※ 27 May 2021       issue date ※ 30 August 2021  
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TUPAB030 Superb Fixed Field Permanent Magnet Proton Therapy Gantry proton, radiation, hadron, MMI 1405
 
  • D. Trbojevic, S.J. Brooks, T. Roser, N. Tsoupas
    BNL, Upton, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
We pre­sent the top notch de­sign of the pro­ton ther­apy gantry made of per­ma­nent mag­nets with very strong fo­cus­ing. This rep­re­sents a su­perb so­lu­tion ful­fill­ing all can­cer treat­ment re­quire­ments for all en­er­gies with­out chang­ing any pa­ra­me­ters. The pro­ton en­ergy range is be­tween 60-250 MeV. The beam ar­rives to the pa­tient fo­cused at each re­quired treat­ment en­ergy. The scan­ning sys­tem is place be­tween the end of the gantry and the pa­tient. There are mul­ti­ple ad­van­tages of this de­sign: easy op­er­a­tion, no sig­nif­i­cant elec­tri­cal power - just for the cor­rec­tion sys­tem, low weight, low cost. The de­sign is based on the re­cent very suc­cess­ful com­mis­sion­ing of the per­ma­nent mag­net ERL ’CBETA’ at Cor­nell Uni­ver­sity. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB030  
About • paper received ※ 17 May 2021       paper accepted ※ 07 June 2021       issue date ※ 21 August 2021  
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TUPAB365 Demonstration of ‘ZEPTO’ Permanent Magnet Technology on Diamond Light Source quadrupole, vacuum, lattice, radiation 2370
 
  • A.R. Bainbridge, B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • N. Krumpa
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • I.P.S. Martin, W. Tizzano
    DLS, Oxfordshire, United Kingdom
  
  The use of per­ma­nent mag­nets (PM’s) in place of tra­di­tional elec­tro­mag­nets is be­com­ing more com­mon in ac­cel­er­a­tor sys­tems around the world. This change is being dri­ven by the de­sire to re­duce both the en­ergy costs and car­bon foot­print of ac­cel­er­a­tors. How­ever, the prob­lem re­mains that it is dif­fi­cult to ad­just the field strength of PM sys­tems. STFC and CERN have a long­stand­ing col­lab­o­ra­tion in the Zero-Power Tune­able Op­tics (ZEPTO) pro­ject which aims to de­velop PM sys­tems that are tune­able via mov­ing the PM blocks within a sta­tic pole struc­ture. This col­lab­o­ra­tion has pre­vi­ously pro­duced 3 pro­to­type mag­nets (2 quadrupoles and 1 di­pole) for the pro­posed CLIC ac­cel­er­a­tor and aims to ex­pand suit­abil­ity to a va­ri­ety of ac­cel­er­a­tors. We are now demon­strat­ing this tech­nol­ogy on a real ma­chine by in­stalling a ZEPTO mag­net on Di­a­mond Light Source. We out­line the de­sign, con­struc­tion, and im­prove­ment of this tech­nol­ogy demon­stra­tor, high­light­ing the in­no­va­tions over pre­vi­ous gen­er­a­tions of ZEPTO tech­nol­ogy that ac­count for pre­vi­ously ob­served draw­backs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB365  
About • paper received ※ 18 May 2021       paper accepted ※ 22 June 2021       issue date ※ 12 August 2021  
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TUPAB368 Design of the Longitudinal Gradient Dipole Magnets for HALF dipole, storage-ring, lattice, emittance 2378
 
  • M.Y. Mingyao
    Wang, Hefei, People’s Republic of China
  • G.Y. Feng, Z.L. Ren, H. Xu
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  Hefei Ad­vanced Light Fa­cil­ity (HALF) is the fourth gen­er­a­tion dif­frac­tion-lim­ited stor­age ring light source pro­ject in China. The lat­tice of the stor­age ring con­sists of six dif­fer­ent dipoles with lon­gi­tu­di­nal gra­di­ents. The lon­gi­tu­di­nal-gra­di­ent dipoles (LGBs) are per­ma­nent mag­nets. This paper pre­sents the de­signed con­struc­tion of LGBs and the mag­netic field re­sults using OP­ER­A3D. By op­ti­miz­ing the shape of the polar sur­face, the mag­netic field uni­for­mity is op­ti­mized to about 5×10-4. With some mov­able ad­just­ing block, the mag­netic field can be con­trolled ac­cu­rately. The tem­per­a­ture sta­bil­ity of the mag­net is bet­ter than 0.0074 T*mm/°C by set­ting tem­per­a­ture com­pen­sat­ing shunt.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB368  
About • paper received ※ 15 May 2021       paper accepted ※ 02 June 2021       issue date ※ 10 August 2021  
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TUPAB373 Design of a Delta-type Superconducting Undulator at the IHEP undulator, polarization, photon, radiation 2391
 
  • J.H. Wei
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • C.D. Deng
    DNSC, Dongguan, People’s Republic of China
  • L. Gong, X.Y. Li, X.C. Yang
    IHEP, Beijing, People’s Republic of China
  • Y. Li
    DESY, Hamburg, Germany
  
  Un­du­la­tors play an im­por­tant role in the 4th gen­er­a­tion ra­di­a­tion light source. In order to sat­isfy dif­fer­ent re­quire­ments of the ex­per­i­ments, var­i­ous un­du­la­tor struc­tures have been pro­posed. The Delta-type un­du­la­tor can pro­vide cir­cu­lar po­lar­ized ra­di­a­tion. Con­ven­tional un­du­la­tors are usu­ally made of per­ma­nent mag­nets, but the ap­pli­ca­tion of the su­per­con­duct­ing tech­nol­ogy in the un­du­la­tor is de­vel­op­ing quickly. Com­pared to the per­ma­nent mag­net un­du­la­tors, su­per­con­duct­ing un­du­la­tors can pro­vide higher pho­ton flux with the same mag­netic pole gap and pe­riod length, es­pe­cially when the pe­riod length is longer than 20 mm. An R&D pro­ject is un­der­way to pro­duce a protype of a Delta-type su­per­con­duct­ing un­du­la­tor with 28 mm long pe­riod and 12 mm gap at the IHEP. The struc­ture de­sign and the sim­u­la­tion re­sults of the mag­netic field are pre­sented in this paper.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB373  
About • paper received ※ 19 May 2021       paper accepted ※ 18 June 2021       issue date ※ 15 August 2021  
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WEPAB128 Recent Experience with Magnet Sorting for APS-U Hybrid Undulators undulator, quadrupole, photon, synchrotron 2910
 
  • I. Vasserman, R.J. Dejus, Y. Piao, M.F. Qian, 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.
The qual­ity of per­ma­nent mag­nets plays a par­tic­u­larly im­por­tant role in un­du­la­tor per­for­mance. Many dif­fer­ent types of mag­net sort­ing to en­hance un­du­la­tor per­for­mance have been car­ried out at dif­fer­ent fa­cil­i­ties. Mean­while, progress in im­prov­ing mag­net qual­ity has been made by dif­fer­ent ven­dors. At the Ad­vanced Pho­ton Source (APS) we have as­sem­bled, mea­sured, and an­a­lyzed over 14 new un­du­la­tors of the same me­chan­i­cal de­sign, some of them with sorted mag­nets and some un­sorted. The per­for­mance dif­fer­ences ap­pear to be in­signif­i­cant in meet­ing the tight APS Up­grade (APS-U) un­du­la­tor re­quire­ments. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB128  
About • paper received ※ 16 May 2021       paper accepted ※ 09 June 2021       issue date ※ 10 August 2021  
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WEPAB129 A New Method of Undulator Phase Tuning with Mechanical Shimming undulator, MMI, radiation, operation 2912
 
  • M.F. Qian, R.J. Dejus, Y. Piao, I. Vasserman, J.Z. Xu
    ANL, Lemont, Illinois, USA
  
  Funding: Work supported by U.S. Department of Energy, Office of Science, under contract number DEAC02-06CH11357.
We de­vel­oped a new method for tun­ing the un­du­la­tor phase er­rors by shim­ming the un­du­la­tor gap pro­file me­chan­i­cally. First, the phase er­rors of a de­vice are cal­cu­lated based on the ini­tial field mea­sure­ment; then the de­sired field strength mod­u­la­tion along the de­vice length is de­rived from the phase er­rors; and fi­nally, the gap pro­file is me­chan­i­cally shimmed to pro­duce the de­sire field strength mod­u­la­tion. The method has been suc­cess­fully ap­plied to the tun­ing of many new and reused APS Up­grade (APS-U) hy­brid per­ma­nent mag­net un­du­la­tors. The method is es­pe­cially ef­fec­tive for tun­ing the legacy un­du­la­tors with large phase er­rors. For in­stance, an old 33-mm-pe­riod un­du­la­tor with a 23 de­gree ini­tial rms phase error largely due to ra­di­a­tion dam­age has been tuned to bet­ter than 3 de­grees. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB129  
About • paper received ※ 19 May 2021       paper accepted ※ 24 June 2021       issue date ※ 13 August 2021  
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WEPAB130 Experience with Algorithm-Guided Tuning of APS-U Undulators undulator, radiation, MMI, electron 2915
 
  • M.F. Qian, R.J. Dejus, Y. Piao, 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.
The Ad­vanced Pho­ton Source (APS) is un­der­go­ing a major up­grade to its stor­age ring. The APS Up­grade (APS-U) pro­ject plans to build over 40 new hy­brid per­ma­nent mag­net un­du­la­tors (HPMUs) and re­build over 20 ex­ist­ing HPMUs. To meet the APS-U un­du­la­tor re­quire­ments, the qual­ity of the un­du­la­tor mag­netic field needs to be fine-tuned to the spec­i­fi­ca­tions. The tra­di­tional meth­ods that de­pend on the tun­ing spe­cial­ist ex­pe­ri­ence are not de­sir­able for tun­ing large quan­ti­ties of un­du­la­tors. We de­vel­oped al­go­rithms that au­to­mate the tun­ing of per­ma­nent mag­net un­du­la­tors. For tun­ing of the un­du­la­tor tra­jec­tory and phase, the al­go­rithms op­ti­mize the tun­ing pa­ra­me­ters with dif­fer­en­tial evo­lu­tion-based global op­ti­miza­tion. The al­go­rithms have been suc­cess­fully ap­plied to over 18 APS HPMUs. The re­sults and ex­pe­ri­ences of the tun­ing are re­ported in de­tail. 		 
poster icon Poster WEPAB130 [0.543 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB130  
About • paper received ※ 19 May 2021       paper accepted ※ 24 June 2021       issue date ※ 12 August 2021  
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THPAB007 Technology Spinoff and Lessons Learned from the 4-Turn ERL CBETA cavity, radiation, SRF, linac 3762
 
  • K.E. Deitrick, N. Banerjee, A.C. Bartnik, D.C. Burke, J.A. Crittenden, J. Dobbins, C.M. Gulliford, G.H. Hoffstaetter, Y. Li, W. Lou, P. Quigley, D. Sagan, K.W. Smolenski
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • J.S. Berg, S.J. Brooks, R.L. Hulsart, G.J. Mahler, F. Méot, R.J. Michnoff, S. Peggs, T. Roser, D. Trbojevic, N. Tsoupas
    BNL, Upton, New York, USA
  • T. Miyajima
    KEK, Ibaraki, Japan
  
  The Cor­nell-BNL ERL Test Ac­cel­er­a­tor (CBETA) de­vel­oped sev­eral en­ergy-sav­ing mea­sures: multi-turn en­ergy re­cov­ery, low-loss su­per­con­duct­ing ra­diofre­quency (SRF) cav­i­ties, and per­ma­nent mag­nets. With green tech­nol­ogy be­com­ing im­per­a­tive for new high-power ac­cel­er­a­tors, the lessons learned will be im­por­tant for pro­jects like the FCC-ee or new light sources, where spin­offs and lessons learned from CBETA are al­ready con­sid­ered for mod­ern de­signs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB007  
About • paper received ※ 20 May 2021       paper accepted ※ 05 July 2021       issue date ※ 12 August 2021  
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THPAB040 A Phase Shifter for Inline Undulators at the Advanced Photon Source Upgrade Project undulator, photon, electron, radiation 3830
 
  • E.R. Moog, R.J. Dejus, A.T. Donnelly, Y. Piao, 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.
Sev­eral un­du­la­tor lines for the Ad­vanced Pho­ton Source Up­grade (APS-U) will con­sist of two in­line un­du­la­tors. In order to keep the un­du­la­tors op­er­at­ing with op­ti­mal phas­ing over the full range of gaps, a phase shifter will be in­cluded be­tween the un­du­la­tors. A de­sign has been de­vel­oped for a phase shifter that will serve for a va­ri­ety of un­du­la­tor pe­riod lengths and gap ranges. The per­ma­nent-mag­net phase shifter will use SmCo mag­nets to re­duce the risk of ra­di­a­tion-in­duced de­mag­ne­ti­za­tion. The avail­able space be­tween the un­du­la­tors is tight, so mag­netic shields are placed be­tween the un­du­la­tors, the phase shifter, and the cor­rec­tor mag­net that is also lo­cated in the in­ter-un­du­la­tor space. While these shields guard against mag­netic cross-talk be­tween the de­vices as the un­du­la­tor and phase shifter gaps change, they do have an ef­fect on the end fields of the de­vices. These end-field ef­fects are ex­am­ined and rel­e­vant tol­er­ances are set and pre­sented. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB040  
About • paper received ※ 23 May 2021       paper accepted ※ 21 June 2021       issue date ※ 14 August 2021  
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THPAB050 Compact Hybrid Planar Permanent Magnet Undulator Design for the APS Upgrade undulator, ECR, lattice, photon 3859
 
  • M. Abliz, M. Borland, J.H. Grimmer, J.S. Kerby, M. Ramanathan, A. Xiao
    ANL, Lemont, Illinois, USA
  
  We re­port on the suc­cess­ful de­sign of a com­pact 28-mm pe­riod hy­brid pla­nar per­ma­nent mag­net (HPPM) un­du­la­tor for the Ad­vanced Pho­ton Source Up­grade (APS-U) pro­ject. The de­sign pro­duces a peak field of 9750 G at a gap of 8.5 mm, with a pole width re­duced to 35 mm as com­pared to the pla­nar un­du­la­tors cur­rently in use at the Ad­vanced Pho­ton Source. The de­sign in­cludes a de­tailed in­ves­ti­ga­tion into the ori­gin of the HPPM un­du­la­tor de­mag­ne­ti­za­tion. We re­port on a find­ing of an op­ti­miza­tion method that re­duces the de­mag­ne­ti­za­tion field and in­creases the field at the gap cen­ter of the de­sign. It in­cludes an op­ti­miza­tion of the pole edges to in­crease the field and de­crease roll-off in the trans­verse di­rec­tion. Fur­ther de­sign op­ti­miza­tions in­clude analy­ses of the me­chan­i­cal as­sem­bly tol­er­ances and com­par­i­son with the orig­i­nal de­sign be­fore build­ing the de­vice. Beam physics analy­ses in­cluded kick-map analy­sis, dy­namic ac­cep­tance (DA), local mo­men­tum ac­cep­tance (LMA), and Tou­schek life­time of this de­sign were per­formed with the 42-pm lat­tice of the APS-U. De­tailed mag­netic de­sign, ef­fec­tive field, field roll-off, mag­netic force, and track­ing re­sults are re­ported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB050  
About • paper received ※ 14 May 2021       paper accepted ※ 01 September 2021       issue date ※ 21 August 2021  
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THPAB085 Status of Insertion Device Tuning for the APS Upgrade undulator, storage-ring, photon, MMI 3966
 
  • R.J. Dejus, Y. Piao, M.F. Qian, J.M. TerHAAR, 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.
The Ad­vanced Pho­ton Source Up­grade (APS-U) pro­ject is de­vel­op­ing a multi-bend achro­mat (MBA) lat­tice at 6.0-GeV beam en­ergy to re­place the ex­ist­ing APS stor­age ring lat­tice op­er­at­ing at 7.0 GeV. One of the key com­po­nents of the pro­ject is to de­sign, fab­ri­cate, and in­stall op­ti­mized in­ser­tion de­vices (IDs) for 35 beam­lines. A plan was de­vel­oped to stan­dard­ize on four new un­du­la­tor pe­riod lengths for 44 new un­du­la­tors and to reuse 23 ex­ist­ing un­du­la­tors with four more dif­fer­ent pe­riod lengths. Early in the Up­grade pro­ject we an­tic­i­pated there would be large chal­lenges in meet­ing the tight fab­ri­ca­tion and tun­ing sched­ules so that all un­du­la­tors would be ready for in­stal­la­tion in the up­graded stor­age ring prior to beam com­mis­sion­ing. With re­cent de­vel­op­ments and tech­niques used in the mag­netic mea­sure­ment lab­o­ra­tory, we have suc­cess­fully tuned many of the new and reused un­du­la­tors to de­mand­ing mag­netic field re­quire­ments. We will re­port on the tools and tech­niques used and on re­sults to date. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB085  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 15 August 2021  
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THPAB141 Novel Design of a HVDC Magnetized Electron Source cathode, solenoid, gun, simulation 4034
 
  • O.H. Rahman, J. Skaritka, E. Wang
    BNL, Upton, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
The hadron beam in EIC is flat with a trans­verse size ratio of about 1:3. The cool­ing rate of the hadron beam can be max­i­mized if the elec­tron beam from the strong hadron cooler fully over­laps with the hadron beam. There­fore, gen­er­at­ing a flat elec­tron beam is es­sen­tial. The most ef­fi­cient way to gen­er­ate a flat elec­tron beam is to pro­duce a mag­ne­tized beam first, and then con­vert it to flat to the de­sired trans­verse size ratio. Using a Mag­ne­tized elec­tron beam is a promis­ing way to cool high-en­ergy hadrons. One of the major chal­lenges in pro­duc­ing mag­ne­tized beams is fine-tun­ing the lon­gi­tu­di­nal mag­netic field on the cath­ode sur­face and main­tain­ing the de­sired field uni­for­mity over the emis­sion area. In this paper, we dis­cuss the de­sign of a novel high volt­age DC gun ca­pa­ble of fine-tun­ing the B field on the cath­ode. This is achieved by in­stalling a per­ma­nent mag­net in­side the cath­ode puck, with a so­le­noid field at the front of the cath­ode. We show mag­ne­to­sta­tic sim­u­la­tion to prove the fea­si­bil­ity of this idea. We also show pre­lim­i­nary beam dy­nam­ics sim­u­la­tions show­ing emit­tance from the gun as the per­ma­nent mag­net and so­le­noidal fields are tuned for min­i­mum emit­tance. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB141  
About • paper received ※ 19 May 2021       paper accepted ※ 02 August 2021       issue date ※ 17 August 2021  
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THPAB230 Design of Split Permanent Magnet Quadrupoles for Small Aperture Implementation quadrupole, electron, focusing, simulation 4247
 
  • I.I. Gadjev, G. Andonian, T.J. Campese, M. Ruelas
    RadiaBeam, Santa Monica, California, USA
  • C.C. Hall
    RadiaSoft LLC, Boulder, Colorado, USA
  
  Per­ma­nent mag­net quadrupoles are ideal for strong fo­cus­ing in com­pact foot­prints. Re­cent re­search in the use of per­ma­nent mag­net based quadru­pole mag­nets has en­abled very high-gra­di­ent uses ap­proach­ing 800T/m in final focus sys­tems. How­ever, in order to achieve high qual­ity field pro­files with strong fields, small di­am­e­ter bore mag­nets must be used ne­ces­si­tat­ing in vac­uum op­er­a­tion, or very small beampipes. For small beampipe geom­e­try, we have de­vel­oped a hy­brid-per­ma­nent mag­net quadru­pole, with steel and per­ma­nent mag­net wedges, that is able to main­tain high qual­ity fields but also read­ily machin­able in a sep­a­ra­ble de­sign. The split de­sign al­lows for ac­cu­rate and re­pro­ducible re­con­fig­u­ra­tion on a beam pipe. In this paper, we will dis­cuss the de­sign, en­gi­neer­ing, fab­ri­ca­tion and first mea­sure­ments of the split per­ma­nent mag­net quadru­pole.  
poster icon Poster THPAB230 [1.605 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB230  
About • paper received ※ 15 May 2021       paper accepted ※ 08 July 2021       issue date ※ 30 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)