Author: Papadopoulou, S.
Paper Title Page
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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)