Author: Wegscheider, A.
Paper Title Page
WEPAB026 Optics Measurements and Correction Plans for the HL-LHC 2656
 
  • T.H.B. Persson, X. Buffat, F.S. Carlier, R. De Maria, J. Dilly, E. Fol, D. Gamba, H. Garcia Morales, A. García-Tabarés Valdivieso, M. Giovannozzi, M. Hofer, E.J. Høydalsvik, J. Keintzel, M. Le Garrec, E.H. Maclean, L. Malina, P.K. Skowroński, F. Soubelet, R. Tomás García, F.F. Van der Veken, A. Wegscheider, D.W. Wolf, L. van Riesen-Haupt
    CERN, Meyrin, Switzerland
  • J.M. Coello de Portugal
    PSI, Villigen PSI, Switzerland
  
  The High Lu­mi­nos­ity LHC (HL-LHC) will re­quire strin­gent op­tics cor­rec­tion to op­er­ate safely and de­liver the de­sign lu­mi­nos­ity to the ex­per­i­ments. In order to achieve this, sev­eral new meth­ods for op­tics cor­rec­tion have been de­vel­oped. In this ar­ti­cle, we out­line some of these meth­ods and we de­scribe the en­vi­sioned strat­egy of how to use them in order to reach the chal­leng­ing re­quire­ments of the HL-LHC physics pro­gram.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB026  
About • paper received ※ 17 May 2021       paper accepted ※ 27 July 2021       issue date ※ 30 August 2021  
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WEPAB027 Optics Correction Strategy for Run 3 of the LHC 2660
 
  • T.H.B. Persson, R. De Maria, J. Dilly, E. Fol, H. Garcia Morales, M. Hofer, E.J. Høydalsvik, J. Keintzel, M. Le Garrec, E.H. Maclean, L. Malina, F. Soubelet, R. Tomás García, A. Wegscheider, D.W. Wolf, L. van Riesen-Haupt
    CERN, Meyrin, Switzerland
  • J.F. Cardona
    UNAL, Bogota D.C, Colombia
  
  The Run 3 of the LHC will con­tinue to pro­vide new chal­lenges for op­tics cor­rec­tions. In order to suc­ceed and go be­yond what was achieved pre­vi­ously, sev­eral new meth­ods to mea­sure and cor­rect the op­tics have been de­vel­oped. In this ar­ti­cle we de­scribe these meth­ods and out­line the plans for the op­tics com­mis­sion­ing in 2022.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB027  
About • paper received ※ 17 May 2021       paper accepted ※ 12 July 2021       issue date ※ 11 August 2021  
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WEPAB399 Applications of the Local Observable in Future Optics Measurements in HL-LHC and PETRA III 3642
 
  • A. Wegscheider, R. Tomás García
    CERN, Geneva, Switzerland
  
  Phase ad­vances among four nearby beam po­si­tion mon­i­tors in a cir­cu­lar ac­cel­er­a­tor can be used to cal­cu­late a local ob­serv­able of quadrupo­lar lat­tice im­per­fec­tions. This work ex­plores the ap­plic­a­bil­ity of this local ob­serv­able to two dif­fer­ent cir­cu­lar ac­cel­er­a­tors: PETRA III, a syn­chro­tron light source, and the LHC, a hadron col­lider as well as its up­grade pro­ject HL-LHC. MADX sim­u­la­tions for im­por­tant op­tics set­tings are per­formed, show­ing that the local ob­serv­able can de­tect strong error sources. This is of par­tic­u­lar in­ter­est in im­por­tant re­gions of the ac­cel­er­a­tors like the LHC’s in­ter­ac­tion re­gions and PETRA III’s ex­per­i­men­tal hall.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB399  
About • paper received ※ 19 May 2021       paper accepted ※ 23 July 2021       issue date ※ 12 August 2021  
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WEPAB400 Forced Coupling Resonance Driving Terms 3646
 
  • A. Wegscheider, R. Tomás García
    CERN, Geneva, Switzerland
  
  At the LHC, cou­pling is rou­tinely mea­sured using forced os­cil­la­tions of the beam through ex­ci­ta­tion with an AC-di­pole. The dri­ving of the par­ti­cle mo­tion has an im­pact on the mea­sure­ment of res­o­nance dri­ving terms. Re­cent find­ings sug­gest that the cur­rent mod­els de­scrib­ing the forced mo­tion are ne­glect­ing a local ef­fect of the AC-di­pole, cre­at­ing a jump of the am­pli­tude of the res­o­nance dri­ving terms. This work pre­sents a study of the im­prove­ment of cou­pling mea­sure­ments for typ­i­cal LHC op­tics as well as its up­grade pro­ject HL-LHC, by using the new model.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB400  
About • paper received ※ 19 May 2021       paper accepted ※ 02 August 2021       issue date ※ 20 August 2021  
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THPAB168 Optics Measurement by Excitation of Betatron Oscillations in the CERN PSB 4078
 
  • E.H. Maclean, F. Antoniou, F. Asvesta, H. Bartosik, C. Bracco, J. Dilly, E. Fol, H. Garcia Morales, M. Hofer, J. Keintzel, M. Le Garrec, T.E. Levens, L. Malina, T.H.B. Persson, T. Prebibaj, E. Renner, P.K. Skowroński, F. Soubelet, R. Tomás García, A. Wegscheider, L. van Riesen-Haupt
    CERN, Meyrin, Switzerland
  
  Op­tics mea­sure­ment from analy­sis of turn-by-turn BPM data of be­ta­tron os­cil­la­tions ex­cited with a kicker mag­net has been em­ployed very suc­cess­fully in many ma­chines but faces par­tic­u­lar chal­lenges in the CERN PSB where BPM to BPM phase ad­vances are sub-op­ti­mal for op­tics re­con­struc­tion. Ex­pe­ri­ence using turn-by-turn os­cil­la­tion data for lin­ear op­tics mea­sure­ments dur­ing PSB com­mis­sion­ing in­2021 is pre­sented, with im­pli­ca­tions for the prospect of such tech­niques in the PSB more gen­er­ally.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB168  
About • paper received ※ 19 May 2021       paper accepted ※ 14 July 2021       issue date ※ 27 August 2021  
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