Author: Perillo Marcone, A.
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WEC2I1
 Beam Intercepting Device Challenges for High Intensity Accelerators - a Global Perspective  
 
  • A. Perillo Marcone
    CERN, Meyrin, Switzerland
  
  Sev­eral beam in­ter­cept­ing de­vices (BID) are used in par­ti­cle ac­cel­er­a­tors for dif­fer­ent func­tions: ma­chine pro­tec­tion (stop­ping the beam in ac­ci­den­tal sce­nar­ios), human safety , beam con­di­tion­ing (e.g. col­li­ma­tors, scrap­ers, slits), sec­ondary beam pro­duc­tion (tar­gets) and ab­sorbers (beam dumps). Since these de­vices are found in ac­cel­er­a­tors with a broad range of beam en­er­gies and par­ti­cle types, a large di­ver­sity of re­quire­ments, ma­te­ri­als and de­signs are ob­served. Typ­i­cal con­sid­er­a­tions are phys­i­cal and struc­tural prop­er­ties of ma­te­ri­als. Hence, the full palette of ma­te­ri­als is used in BIDs across the dif­fer­ent ac­cel­er­a­tors, from ce­ram­ics and car­bon-based ma­te­ri­als (graphite and CfC) to vir­tu­ally all met­als. In ad­di­tion, some de­vices need to ab­sorb and man­age power (heat) de­posited by the beam, which im­poses other con­straints in the de­sign, like cool­ing re­quire­ments and ser­vice tem­per­a­ture of the ma­te­ri­als em­ployed. Ir­ra­di­a­tion dam­age is also ac­counted for in the de­sign of some de­vices. A state of the art of BIDs used in dif­fer­ent ac­cel­er­a­tor com­plexes in the world will be pre­sented here, in­clud­ing their main func­tion­al­i­ties, re­quire­ments and de­sign fea­tures.  
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THBP49 Collimation of 400 MJ Beams at the LHC: The First Step Towards the HL-LHC Era 603
 
  • S. Redaelli, A. Abramov, D.B. Baillard, R. Bruce, R. Cai, F. Carra, M. D’Andrea, M. Di Castro, L. Giacomel, P.D. Hermes, B. Lindström, D. Mirarchi, N. Mounet, F.-X. Nuiry, A. Perillo Marcone, F.F. Van der Veken
    CERN, Meyrin, Switzerland
  • R. Cai
    EPFL, Lausanne, Switzerland
  • A. Vella
    University of Malta, Information and Communication Technology, Msida, Malta
  
  Funding: Work supported by the HL-LHC project.
An im­por­tant up­grade pro­gramme is planned for the col­li­ma­tion sys­tem of the CERN Large Hadron Col­lider (LHC) in order to meet the chal­lenges of the up­com­ing High-Lu­mi­nos­ity LHC (HL-LHC) pro­ject. A first stage of the HL-LHC up­grade was al­ready de­ployed dur­ing the last LHC Long Shut­down, of­fer­ing im­por­tant im­prove­ments of the col­li­ma­tion clean­ing, a sig­nif­i­cant re­duc­tion of the im­ped­ance con­tri­bu­tion and bet­ter clean­ing of col­li­sional de­bris, in par­tic­u­lar for ion-ion col­li­sions. This up­grade pro­vides a crit­i­cal op­por­tu­nity to ex­plore the LHC in­ten­sity lim­its dur­ing the LHC Run 3 and can pro­vide cru­cial feed­back to re­fine up­grade plans and op­er­a­tional sce­nar­ios in the HL-LHC era. This paper de­scribes the per­for­mance of the up­graded LHC col­li­ma­tion sys­tem that has al­ready en­abled stored-beam en­er­gies larger than 400 MJ at the un­prece­dented beam en­ergy of 6.8 TeV, and re­views fur­ther up­grade plans en­vis­aged to reach 700 MJ beams at the HL-LHC. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP49  
About • Received ※ 03 October 2023 — Revised ※ 08 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 10 October 2023
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