Author: D’Andrea, M.
Paper Title Page
MOPAB002 Risk of Halo-Induced Magnet Quenches in the HL-LHC Beam Dump Insertion 41
 
  • J.B. Potoine, A. Apollonio, E. Belli, C. Bracco, R. Bruce, M. D’Andrea, R. García Alía, A. Lechner, G. Lerner, S. Morales Vigo, S. Redaelli, V. Rizzoglio, E. Skordis, A. Waets
    CERN, Meyrin, Switzerland
  • F. Wrobel
    IES, Montpellier, France
  
  Funding: Research supported by the HL-LHC project
After the High Lu­mi­nos­ity (HL-LHC) up­grade, the LHC will be ex­posed to a higher risk of mag­net quenches dur­ing pe­ri­ods of short beam life­time. Col­li­ma­tors in the ex­trac­tion re­gion (IR6) as­sure the pro­tec­tion of mag­nets against asyn­chro­nous beam dumps, but they also in­ter­cept a frac­tion of the beam halo leak­ing from the be­ta­tron clean­ing in­ser­tion. In this paper, we as­sess the risk of quench­ing nearby quadrupoles dur­ing beam life­time drops. In par­tic­u­lar, we pre­sent an em­pir­i­cal analy­sis of halo losses in IR6 using LHC Run 2 (2015-2018) beam loss mon­i­tor mea­sure­ments. Based on these re­sults, the halo-in­duced power den­sity in mag­net coils ex­pected in HL-LHC is es­ti­mated using FLUKA Monte Carlo shower sim­u­la­tions. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB002  
About • paper received ※ 19 May 2021       paper accepted ※ 13 July 2021       issue date ※ 22 August 2021  
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WEPAB023 Crystal Collimation of 20 MJ Heavy-Ion Beams at the HL-LHC 2644
 
  • M. D’Andrea, R. Bruce, M. Di Castro, I. Lamas Garcia, A. Masi, D. Mirarchi, S. Redaelli, R. Rossi, B. Salvachua, W. Scandale
    CERN, Meyrin, Switzerland
  • F. Galluccio
    INFN-Napoli, Napoli, Italy
  • L.J. Nevay
    Royal Holloway, University of London, Surrey, United Kingdom
  
  The con­cept of crys­tal col­li­ma­tion at the Large Hadron Col­lider (LHC) re­lies on the use of bent crys­tals that can de­flect halo par­ti­cles by a much larger angle than the stan­dard multi-stage col­li­ma­tion sys­tem. Fol­low­ing an ex­ten­sive cam­paign of stud­ies and per­for­mance val­i­da­tions, a num­ber of crys­tal col­li­ma­tion tests with Pb ion beams were per­formed in 2018 at en­er­gies up to 6.37 Z TeV. This paper de­scribes the pro­ce­dure and out­comes of these tests, the most im­por­tant of which being the demon­stra­tion of the ca­pa­bil­ity of crys­tal col­li­ma­tion to im­prove the clean­ing ef­fi­ciency of the ma­chine. These re­sults led to the in­clu­sion of crys­tal col­li­ma­tion into the LHC base­line for op­er­a­tion with ion beams in Run 3 as well as for the HL-LHC era. A first set of op­er­a­tional set­tings was de­fined.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB023  
About • paper received ※ 19 May 2021       paper accepted ※ 23 June 2021       issue date ※ 27 August 2021  
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WEPAB024 Release of Crystal Routine for Multi-Turn Proton Simulations within SixTrack v5 2648
 
  • M. D’Andrea, A. Mereghetti, D. Mirarchi, V.K.B. Olsen, S. Redaelli
    CERN, Geneva, Switzerland
  
  Crys­tal col­li­ma­tion is stud­ied as a pos­si­ble scheme to fur­ther im­prove the ef­fi­ciency of ion col­li­ma­tion at the High Lu­mi­nos­ity Large Hadron Col­lider (HL-LHC), as well as for pos­si­ble ap­pli­ca­tions in the CERN pro­gram of Physics Be­yond Col­lid­ers. This con­cept re­lies on the use of bent crys­tals that can de­flect high-en­ergy halo par­ti­cles at large an­gles, of the order of tens of urad. In order to re­pro­duce key ex­per­i­men­tal re­sults of crys­tal col­li­ma­tion tests and pre­dict the per­for­mance of this sys­tem when ap­plied to pre­sent and fu­ture ma­chines, a ded­i­cated sim­u­la­tion rou­tine was de­vel­oped. This rou­tine is ca­pa­ble of mod­el­ing both co­her­ent and in­co­her­ent in­ter­ac­tions of beam par­ti­cles with crys­tal col­li­ma­tors, and is fully in­te­grated into the mag­netic track­ing and col­li­ma­tor mod­el­ing pro­vided by the sin­gle-par­ti­cle track­ing code Six­Track. This paper de­scribes the im­ple­men­ta­tion of the rou­tine in the lat­est ver­sion of Six­Track and its most re­cent im­prove­ments, in par­tic­u­lar re­gard­ing the treat­ment of the crys­tal mis­cut angle.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB024  
About • paper received ※ 19 May 2021       paper accepted ※ 23 June 2021       issue date ※ 14 August 2021  
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