Author: Xiao, B.P.
Paper Title Page
WEPA26 197 MHz Waveguide Loaded Crabbing Cavity Design for the Electron-Ion Collider 679
 
  • S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • J. Guo, R.A. Rimmer
    JLab, Newport News, Virginia, USA
  • Z. Li
    SLAC, Menlo Park, California, USA
  • B.P. Xiao
    BNL, Upton, New York, USA
  
  The Elec­tron-Ion Col­lider will re­quire crab­bing sys­tems at both hadron and elec­tron stor­age rings in order to reach the de­sired lu­mi­nos­ity goal. The 197 MHz crab cav­ity sys­tem is one of the crit­i­cal rf sys­tems of the col-lider. The crab cav­ity, based on the rf-di­pole de­sign, ex-plores the op­tion of wave­guide load damp­ing to sup­press the higher order modes and meet the tight im­ped­ance spec­i­fi­ca­tions. The cav­ity is de­signed with com­pact dog-bone wave­guides with tran­si­tions to rec­tan­gu­lar wave-guides and wave­guide loads. This paper pre­sents the com­pact 197 MHz crab cav­ity de­sign with wave­guide damp­ing and other an­cil­lar­ies.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA26  
About • Received ※ 08 August 2022 — Revised ※ 09 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 06 September 2022
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WEPA36 Emittance Growth Due to RF Phase Noise in Crab Cavities 708
 
  • H. Huang, S. Zhao
    ODU, Norfolk, Virginia, USA
  • F. Lin, V.S. Morozov
    ORNL RAD, Oak Ridge, Tennessee, USA
  • Y. Luo
    Brookhaven National Laboratory (BNL), Electron-Ion Collider, Upton, New York, USA
  • T. Satogata, Y. Zhang
    JLab, Newport News, Virginia, USA
  • B.P. Xiao, D. Xu
    BNL, Upton, New York, USA
  
  The Elec­tron-Ion Col­lider (EIC) in­cor­po­rates beam crab­bing to re­cover geo­met­ric lu­mi­nos­ity loss from the nonzero cross­ing angle at the in­ter­ac­tion point (IP). It is well-known that crab cav­ity im­per­fec­tions can cause growth of col­lid­ing beam emit­tances, thus de­grad­ing col­lider per­for­mance. Here we re­port a par­ti­cle track­ing study to quan­tify these ef­fects. Presently the study is fo­cused on crab cav­ity RF phase noise. Sim­u­la­tions were car­ried out using Bmad. De­pen­dence of emit­tance growth on phase noise level was ob­tained which could be used for de­vel­op­ing crab cav­ity phase con­trol spec­i­fi­ca­tions. We also bench­marked these sim­u­la­tions with the­ory.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA36  
About • Received ※ 02 August 2022 — Revised ※ 07 August 2022 — Accepted ※ 12 August 2022 — Issue date ※ 02 September 2022
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