Author: Redaelli, S.
Paper Title Page
TU3C03 Collimator Scan Based Beam Halo Measurements in LHC and HL-LHC 164
 
  • P.D. Hermes, M. Giovannozzi, C.E. Montanari, S. Morales Vigo, S. Redaelli, B. Salvachúa
    CERN, Meyrin, Switzerland
  • M. Rakic
    EPFL, Lausanne, Switzerland
  
  Mea­sure­ments in the CERN Large Hadron Col­lider (LHC) have in­di­cated that the pop­u­la­tion of the trans­verse beam halo is greater than that of a Gauss­ian dis­tri­b­u­tion. With the up­com­ing High Lu­mi­nos­ity up­grade (HL-LHC), the stored beam en­ergy in the beam halo could be­come large enough to threaten the in­tegrity of the col­li­ma­tion sys­tem. Con­sid­er­able ef­forts dur­ing the on­go­ing LHC Run 3 are ded­i­cated to char­ac­ter­is­ing the trans­verse beam halo, and its dif­fu­sion prop­er­ties, after the LHC In­jec­tor Up­grade (LIU) in prepa­ra­tion for HL-LHC op­er­a­tion. Given the un­prece­dented stored beam en­er­gies of about 400MJ, presently achieved at the LHC, and about 700MJ planned at the HL-LHC, con­ven­tional mea­sure­ments are dif­fi­cult. Halo and dif­fu­sion mea­sure­ments are cur­rently based on col­li­ma­tor scans, where ro­bust col­li­ma­tors are in­serted in steps into the cir­cu­lat­ing beam halo. In this con­tri­bu­tion, we pre­sent tech­niques for halo char­ac­ter­i­sa­tion em­ployed in LHC and com­pare re­sults ob­tained from such mea­sure­ments in LHC Run 2 and the on­go­ing LHC Run 3. We pre­sent plans for mea­sure­ments in the re­main­der of LHC Run 3 and de­scribe ex­pected chal­lenges for halo quan­tifi­ca­tion in HL-LHC.  
slides icon Slides TU3C03 [5.876 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C03  
About • Received ※ 05 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 12 September 2023
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