학술논문
Electron lenses for head-on beam-beam compensation in RHIC
Document Type
article
Author
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
Source
Physical Review Accelerators and Beams, Vol 20, Iss 2, p 023501 (2017)
Subject
Language
English
ISSN
2469-9888
Abstract
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.