Author: Brischetto, Y.
Paper Title Page
THBP37 Refining the LHC Longitudinal Impedance Model 559
 
  • M. Zampetakis, T. Argyropoulos, Y. Brischetto, R. Calaga, L. Giacomel, B.E. Karlsen-Bæck, I. Karpov, I. Karpov, N. Mounet, B. Salvant, H. Timko
    CERN, Meyrin, Switzerland
  • B.E. Karlsen-Bæck
    INFN-Roma, Roma, Italy
  
  Mod­el­ling the lon­gi­tu­di­nal im­ped­ance for the Large Hadron Col­lider (LHC) has been a long-stand­ing ef­fort, es­pe­cially in view of its High-Lu­mi­nos­ity (HL) up­grade. The re­sult­ing im­ped­ance model is an es­sen­tial input for beam dy­nam­ics stud­ies. In­creased beam in­ten­si­ties in the HL-LHC era will pose new chal­lenges like RF power lim­i­ta­tions, beam losses at in­jec­tion and cou­pled-bunch in­sta­bil­i­ties through­out the ac­cel­er­a­tion cycle. Start­ing from the ex­ist­ing lon­gi­tu­di­nal im­ped­ance model, ef­fort has been made to iden­tify the main con­tribut­ing de­vices and im­prove their mod­el­ling. Loss of Lan­dau damp­ing (LLD) sim­u­la­tions are per­formed to in­ves­ti­gate the de­pen­dence of the sta­bil­ity thresh­old on the com­plete­ness of the im­ped­ance model and its broad-band cut-off fre­quency. Plans to per­form beam mea­sure­ments to es­ti­mate the cut-off fre­quency, by in­ves­ti­gat­ing the LLD thresh­old in op­er­a­tion, are also dis­cussed.  
poster icon Poster THBP37 [5.606 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP37  
About • Received ※ 01 October 2023 — Revised ※ 06 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 14 October 2023
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