Physical Review Accelerators and Beams (Feb 2017)

Electron lenses for head-on beam-beam compensation in RHIC

  • X. Gu,
  • W. Fischer,
  • Z. Altinbas,
  • M. Anerella,
  • E. Bajon,
  • M. Bannon,
  • D. Bruno,
  • M. Costanzo,
  • A. Drees,
  • D. M. Gassner,
  • R. C. Gupta,
  • J. Hock,
  • M. Harvey,
  • A. K. Jain,
  • J. P. Jamilkowski,
  • P. Kankiya,
  • R. Lambiase,
  • C. Liu,
  • Y. Luo,
  • M. Mapes,
  • A. Marusic,
  • C. Mi,
  • R. Michnoff,
  • T. A. Miller,
  • M. Minty,
  • S. Nemesure,
  • W. Ng,
  • D. Phillips,
  • A. I. Pikin,
  • P. J. Rosas,
  • G. Robert-Demolaize,
  • T. Samms,
  • J. Sandberg,
  • V. Schoefer,
  • T. C. Shrey,
  • Y. Tan,
  • R. Than,
  • C. Theisen,
  • P. Thieberger,
  • J. Tuozzolo,
  • P. Wanderer,
  • W. Zhang,
  • S. M. White

DOI
https://doi.org/10.1103/PhysRevAccelBeams.20.023501
Journal volume & issue
Vol. 20, no. 2
p. 023501

Abstract

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Two electron lenses (e-lenses) have been in operation during the 2015 RHIC physics run as part of a head-on beam-beam compensation scheme. While the RHIC lattice was chosen to reduce the beam-beam-induced resonance-driving terms, the electron lenses reduced the beam-beam-induced tune spread. This has been demonstrated for the first time. The beam-beam compensation scheme allows for higher beam-beam parameters and therefore higher intensities and luminosity. In this paper, we detail the design considerations and verification of the electron beam parameters of the RHIC e-lenses. Longitudinal and transverse alignments with ion beams and the transverse beam transfer function measurement with head-on electron-proton beam are presented.