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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