Author: Schulte, D.
Paper Title Page
THBP17 Transverse Coherent Instability Studies for the High-Energy Part of the Muon Collider Complex 491
 
  • D. Amorim, F. Batsch, L. Bottura, D. Calzolari, C. Carli, H. Damerau, A. Grudiev, A. Lechner, E. Métral, D. Schulte, K. Skoufaris
    CERN, Meyrin, Switzerland
  • A. Chancé
    CEA-DRF-IRFU, France
  • T. Pieloni
    EPFL, Lausanne, Switzerland
  
  Funding: This project has received funding from the European Union¿s Research and Innovation programme under GA No 101094300 and the Swiss Accelerator Research and Technology (CHART) program (www.chart.ch).
The In­ter­na­tional Muon Col­lider Col­lab­o­ra­tion (IMCC) is study­ing a 3 TeV cen­ter-of-mass muon col­lider ring, as well as a pos­si­ble next stage at 10 TeV. Muons being 200 times heav­ier than elec­trons, lim­i­ta­tions from syn­chro­tron ra­di­a­tion are mostly sup­pressed, but the muon decay dri­ves the ac­cel­er­a­tor chain de­sign. After the muon and anti-muon bunches are pro­duced and 6D cooled, a se­ries of Linac, re­cir­cu­lat­ing Linac and Rapid Cy­cling Syn­chro­tron (RCS) quickly ac­cel­er­ate the bunches be­fore the col­lider ring. A large num­ber of RF cav­i­ties are re­quired in the RCS to en­sure that over 90% of the muons sur­vive in each ring. The ef­fects of cav­i­ties higher-or­der modes on trans­verse co­her­ent sta­bil­ity have been looked at in de­tail, in­clud­ing the one of a bunch off­set in the cav­i­ties, along with pos­si­ble mit­i­ga­tion mea­sures. In the col­lider ring, the decay of high-en­ergy muons is a chal­lenge for heat load man­age­ment and ra­di­a­tion shield­ing. A tung­sten liner would pro­tect the su­per­con­duct­ing mag­net from decay prod­ucts. Im­ped­ance and re­lated beam sta­bil­ity have been in­ves­ti­gated to iden­tify the min­i­mum vac­uum cham­ber ra­dius and trans­verse damper prop­er­ties re­quired for sta­ble beams. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP17  
About • Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 01 November 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THBP43 Intensity Effects in a Chain of Muon RCSs 579
 
  • F. Batsch, D. Amorim, H. Damerau, A. Grudiev, I. Karpov, E. Métral, D. Schulte
    CERN, Meyrin, Switzerland
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • S. Udongwo
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
  
  Funding: Funded by the European Union under Grant Agreement n.101094300
The muon col­lider of­fers an at­trac­tive path to a com­pact, multi-TeV lep­ton col­lider. How­ever, the short muon life­time leads to strin­gent re­quire­ments on the fast en­ergy in­crease. While ex­treme en­ergy gains in the order of sev­eral GeV per turn are cru­cial for a high el­e­vated muon sur­vival rate, ul­tra-short and in­tense bunches are needed to achieve large lu­mi­nos­ity. The lon­gi­tu­di­nal beam dy­nam­ics of a chain of rapid cy­cling syn­chro­trons (RCS) for ac­cel­er­a­tion from around 60 GeV to sev­eral TeV is being in­ves­ti­gated in the frame­work of the In­ter­na­tional Muon Col­lider Col­lab­o­ra­tion. Each RCS must have a dis­trib­uted ra­dio-fre­quency (RF) sys­tem with sev­eral hun­dred RF sta­tions to es­tab­lish sta­ble syn­chro­tron mo­tion. In this con­tri­bu­tion, the beam-in­duced volt­age in each RCS is stud­ied, as­sum­ing a sin­gle high-in­ten­sity bunch per beam in each di­rec­tion and ILC-like 1.3 GHz ac­cel­er­at­ing struc­tures. The im­pact of sin­gle- and multi-turn wake­fields on lon­gi­tu­di­nal sta­bil­ity and RF power re­quire­ments is analysed with par­ti­cle track­ing sim­u­la­tions. Spe­cial at­ten­tion is more­over paid to the beam power de­posited into the higher-or­der modes of the RF cav­i­ties. 		 
poster icon Poster THBP43 [1.345 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP43  
About • Received ※ 29 September 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 10 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)