Keyword: sextupole
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MOA1I3 Intense Beam Issues in CSNS Accelerator Beam Commissioning space-charge, MMI, injection, cavity 16
 
  • L. Huang, H.Y. Liu, X.H. Lu, X.B. Luo, J. Peng, L. Rao
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • Y.W. An, J. Chen, M.Y. Huang, Y. Li, Z.P. Li, S. Wang
    IHEP, Beijing, People’s Republic of China
  • S.Y. Xu
    DNSC, Dongguan, People’s Republic of China
  
  The China Spal­la­tion Neu­tron Source (CSNS) con­sists of an 80 MeV H⁻ Linac, a 1.6 GeV Rapid Cy­cling Syn­chro­tron (RCS), beam trans­port lines, a tar­get sta­tion, and three spec­trom­e­ters. The CSNS de­sign beam power is 100 kW, with the ca­pa­bil­ity to up­grade to 500 kW. In Au­gust 2018, CSNS was of­fi­cially opened to do­mes­tic and in­ter­na­tional users. By Feb­ru­ary 2020, the beam power had reached 100 kW, and through im­prove­ments such as adding har­monic cav­i­ties, the beam power was in­creased to 140 kW. Dur­ing the beam com­mis­sion­ing process, the beam loss caused by space charge ef­fects was the most sig­nif­i­cant fac­tor lim­it­ing the in­crease in beam power. Ad­di­tion­ally, un­ex­pected col­lec­tive ef­fects were ob­served, in­clud­ing co­her­ent os­cil­la­tions of the bunches, after the beam power reached 50 kW. Through a se­ries of mea­sures, the space charge ef­fects and col­lec­tive in­sta­bil­i­ties caus­ing beam loss were ef­fec­tively con­trolled. This paper mainly in­tro­duces the strong beam ef­fects dis­cov­ered dur­ing the beam com­mis­sion­ing at CSNS and their sup­pres­sion meth­ods. It also briefly dis­cusses the re­search on beam space charge ef­fects and col­lec­tive ef­fects in the beam dy­nam­ics de­sign of CSNS-II pro­ject.  
slides icon Slides MOA1I3 [8.597 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-MOA1I3  
About • Received ※ 01 October 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 24 October 2023
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WEA2I1 Compensation of Third-order Resonances in the High Intensity Regime resonance, space-charge, operation, experiment 215
 
  • C.E. Gonzalez-Ortiz
    MSU, East Lansing, Michigan, USA
  • R. Ainsworth
    Fermilab, Batavia, Illinois, USA
  • P.N. Ostroumov
    FRIB, East Lansing, Michigan, USA
  
  As the Fer­mi­lab Ac­cel­er­a­tor Com­plex en­ters the high-in­ten­sity era, the Re­cy­cler Ring (RR) needs to mit­i­gate the detri­men­tal ef­fect of third-or­der res­o­nance cross­ing. Third-or­der res­o­nance lines can be com­pen­sated to first order by can­celling out the global Res­o­nance Dri­ving Terms (RDTs) using the re­sponse ma­trix method. This com­pen­sa­tion scheme has been proven to work at low in­ten­si­ties, i.e., in the sin­gle-par­ti­cle regime. In order to eval­u­ate the ef­fec­tive­ness of this com­pen­sa­tion scheme at higher in­ten­si­ties, this study looks at dy­namic and sta­tic tune scans, with and with­out res­o­nance com­pen­sa­tion, and dif­fer­ent space charge tune shifts. Spe­cial care was taken in order to dis­en­tan­gle ef­fects from space charge tune shift, struc­ture res­o­nances and space charge dri­ven res­o­nances.  
slides icon Slides WEA2I1 [6.714 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-WEA2I1  
About • Received ※ 02 October 2023 — Revised ※ 07 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 09 October 2023
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THAFP02 Resonance Extraction Research Based on China Spallation Neutron Source extraction, resonance, kicker, lattice 397
 
  • Y.W. An, L. Huang, Z.P. Li, S.Y. Xu, Y.S. Yuan
    IHEP, Beijing, People’s Republic of China
  
  Res­o­nance ex­trac­tion based on the RCS ring is an im­por­tant as­pect of beam ap­pli­ca­tions. This ar­ti­cle pro­poses a new de­sign of res­o­nance ex­trac­tion based on the CSNS-RCS ring. By ad­just­ing pa­ra­me­ters such as the skew sex­tu­pole mag­net, beam work­ing point, RF-Kicker, etc., the sim­u­la­tion re­sults from Py­Or­bit demon­strate the abil­ity to rapidly ex­tract a large num­ber of pro­tons within a few turns.  
slides icon Slides THAFP02 [1.497 MB]  
poster icon Poster THAFP02 [0.960 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THAFP02  
About • Received ※ 01 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 01 November 2023
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