Author: Argyropoulos, T.
Paper Title Page
THPAB199 Studies of Longitudinal Beam Losses at LHC Injection 4164
 
  • L.E. Medina Medrano, T. Argyropoulos, R. Calaga, H. Timko
    CERN, Meyrin, Switzerland
 
  Funding: Research supported by the HL-LHC project.
Due to higher beam intensities, the required rf power in the High-Luminosity LHC (HL-LHC) era is expected to be at the limit of the available rf power. To mitigate potential limitations of the rf system, the injection voltage can be reduced at the expense of beam losses. In this paper, the average and bunch-by-bunch losses are estimated from Run 2 beam intensity measurements in the SPS before extraction and in the LHC after injection. Macro-particle simulations are performed with CERN’s Beam Longitudinal Dynamics code to reproduce the observed SPS-to-LHC capture and LHC flat-bottom losses. First estimates of injection losses for the HL-LHC at different injection voltages and injection energy errors are discussed.
 
poster icon Poster THPAB199 [2.428 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB199  
About • paper received ※ 18 May 2021       paper accepted ※ 28 July 2021       issue date ※ 14 August 2021  
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THPAB200 Cavity Control Modelling for SPS-to-LHC Beam Transfer Studies 4168
 
  • L.E. Medina Medrano, T. Argyropoulos, P. Baudrenghien, H. Timko
    CERN, Meyrin, Switzerland
 
  Funding: Research supported by the HL-LHC project.
To accurately simulate injection losses in the LHC and the High-Luminosity LHC era, a realistic beam distribution model at SPS extraction is needed. To achieve this, the beam-loading compensation by the SPS cavity controller has to be included, as it modulates the bunch positions with respect to the rf buckets. This dynamic cavity control model also allows generating a more realistic beam halo, from which the LHC injection losses will mainly originate. In this paper, the implementation of the present SPS cavity controller in CERN’s Beam Longitudinal Dynamics particle tracking code is described. Just like in the machine, the feedback and feedforward controls are included in the simulation model, as well as the generator-beam-cavity interaction. Benchmarking against measurements of the generated beam distributions at SPS extraction are presented.
 
poster icon Poster THPAB200 [4.164 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB200  
About • paper received ※ 18 May 2021       paper accepted ※ 27 July 2021       issue date ※ 26 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)