Author: Lorin, C.
Paper Title Page
TUPAB225 3D Magnetic Field Analysis of LHC Final Focus Quadrupoles with Beam Screen 1952
 
  • T. Pugnat, B. Dalena, C. Lorin
    CEA-IRFU, Gif-sur-Yvette, France
  • S. Bagnis
    CEA-DRF-IRFU, France
 
  During the LHC commissioning, a discrepancy in the non-linear corrector strengths between the model and the beam-based values has been observed*. This has motivated the reconstruction of the 3D finite element model for the LHC final focusing MQXA type magnet. The longitudinal higher orders magnetic field pseudo-harmonics are computed taking into account ovalization of the magnet, interconnections design, and beam screens. The effect of this 3D field on the computation of the nonlinear correctors is evaluated and compared with beam-based corrector values.
*E. H. Maclean et al., "New approach to LHC optics commissioning for the nonlinear era", Phys. Rev. Acc. B, vol. 22, pp. 061004, June 2019.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB225  
About • paper received ※ 18 May 2021       paper accepted ※ 08 July 2021       issue date ※ 12 August 2021  
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