Author: Karastathis, N.
Paper Title Page
MOPAB008 Exploiting the Beam-Beam Wire Demonstrators in the Next LHC Run 3 65
 
  • A. Poyet
    Université Grenoble Alpes, Grenoble, France
  • S.D. Fartoukh, N. Karastathis, Y. Papaphilippou, A. Rossi, G. Sterbini
    CERN, Geneva, Switzerland
  • K. Skoufaris
    University of Crete, Heraklion, Crete, Greece
  
  After the suc­cess­ful ex­per­i­ments per­formed dur­ing the LHC Run 2 with the Beam-Beam Wire demon­stra­tors in­stalled, on Beam 2, in the frame of the HL-LHC pro­ject, two of the four wire demon­stra­tors were moved to Beam 1. The ob­jec­tive is to gain op­er­a­tional ex­pe­ri­ence with the wire com­pen­sa­tion also on that beam and there­fore fully ex­ploit the demon­stra­tors’ po­ten­tial. This paper pro­poses a nu­mer­i­cal val­i­da­tion of the wire im­ple­men­ta­tion using Run 3 sce­nar­ios and ex­plores the op­ti­miza­tion of those de­vices in that re­spect.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB008  
About • paper received ※ 17 May 2021       paper accepted ※ 24 May 2021       issue date ※ 11 August 2021  
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THPAB172 Bunch Luminosity Variations in LHC Run 2 4094
 
  • I. Efthymiopoulos, S.D. Fartoukh, G. Iadarola, N. Karastathis, S. Papadopoulou, Y. Papaphilippou
    CERN, Geneva, Switzerland
  
  The LHC is de­signed to col­lide in­tense bunches of pro­tons with tightly de­fined con­di­tions, aimed to max­i­mize the de­liv­ered recorded in­te­grated lu­mi­nos­ity to the ex­per­i­ments. One of these con­di­tions is the max­i­mum level of bunch-to-bunch fluc­tu­a­tion in the lu­mi­nos­ity, in par­tic­u­lar when lev­el­ling at max­i­mum ac­cept­able event rate at the ex­per­i­ments. Analy­sis re­sults of the bunch-to-bunch lu­mi­nos­ity vari­a­tions in LHC Run 2 are pre­sented here. In par­tic­u­lar, the ob­served cor­re­la­tions with the LHC fill­ing pat­tern that can en­hance the ef­fects in­tro­duc­ing bunch-de­pen­dent losses or emit­tance blow-up from in­jec­tion to col­li­sions are dis­cussed. In Run 2 con­di­tions, bunch-by-bunch lu­mi­nos­ity fluc­tu­a­tions reached 10% at the start of col­li­sions and grad­u­ally in­creased with time, with­out af­fect­ing the ex­per­i­ments as the lu­mi­nos­ity was not lev­elled. Pro­jec­tions for Run 3 and HL-LHC op­er­a­tion are dis­cussed along with en­vis­aged mit­i­ga­tion mea­sures.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB172  
About • paper received ※ 18 May 2021       paper accepted ※ 19 July 2021       issue date ※ 23 August 2021  
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