Author: Carideo, E.
Paper Title Page
MOXC01 Combined Effect of Beam-Beam Interaction and Beam Coupling Impedance in Future Circular Colliders 25
 
  • Y. Zhang, N. Wang
    IHEP, Beijing, People’s Republic of China
  • E. Carideo
    CERN, Geneva, Switzerland
  • M. Migliorati
    SBAI, Roma, Italy
  • M. Zobov
    INFN/LNF, Frascati, Italy
  
  Funding: This work is supported by National Key Programme for S&T Research and Development, China (Grant No. 2016YFA0400400), National Natural Science Foundation of China (No. 11775238, No. 11775239).
The fu­ture large scale elec­tron-positron col­lid­ers, such as FCC-ee in Eu­rope and CEPC in China, will rely on the crab waist col­li­sion scheme with a large Pi­win­ski angle. Dif­fer­ently from the past gen­er­a­tion col­lid­ers both lu­mi­nos­ity and beam-beam tune shifts de­pend on the bunch length in such a col­li­sion scheme. In ad­di­tion, for the fu­ture cir­cu­lar col­lid­ers with ex­treme beam pa­ra­me­ters in col­li­sion sev­eral new ef­fects be­come im­por­tant such as beam­strahlung, co­her­ent X-Z in­sta­bil­ity and 3D flip-flop. For all these ef­fects the lon­gi­tu­di­nal beam dy­nam­ics plays an es­sen­tial role and should be taken into ac­count for the col­lider lu­mi­nos­ity op­ti­miza­tion. In this paper we dis­cuss an im­pact of the lon­gi­tu­di­nal beam cou­pling im­ped­ance on the col­lider per­for­mance. 		 
slides icon Slides MOXC01 [2.269 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOXC01  
About • paper received ※ 17 May 2021       paper accepted ※ 27 July 2021       issue date ※ 17 August 2021  
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WEPAB225 Transverse and Longitudinal Single Bunch Instabilities in FCC-ee 3153
 
  • E. Carideo, D. Quartullo, F. Zimmermann
    CERN, Meyrin, Switzerland
  • D. De Arcangelis
    Sapienza University of Rome, Rome, Italy
  • M. Migliorati, M. Zobov
    INFN/LNF, Frascati, Italy
  
  Im­prov­ing the ac­cu­racy of the im­ped­ance model of an ac­cel­er­a­tor is im­por­tant for keep­ing beam in­sta­bil­i­ties and power loss under con­trol. Here, by means of the Py­HEAD- TAIL track­ing code, we first re­view the lon­gi­tu­di­nal mi- crowave in­sta­bil­ity thresh­old for FCC-ee by tak­ing into ac- count the lon­gi­tu­di­nal im­ped­ance model eval­u­ated so far. More­over, we pre­sent the re­sults of beam dy­nam­ics sim­ula- tions, in­clud­ing both the lon­gi­tu­di­nal and trans­verse wake- fields due to the re­sis­tive wall, in order to eval­u­ate the in­flu- ence of the bunch length on the trans­verse mode cou­pling in­sta­bil­ity. The re­sults of the trans­verse beam dy­nam­ics are also com­pared with the Vlasov solver DEL­PHI.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB225  
About • paper received ※ 10 May 2021       paper accepted ※ 01 July 2021       issue date ※ 18 August 2021  
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