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Title: RHIC electron lenses upgrades

In the Relativistic Heavy Ion Collider (RHIC) 100 GeV polarized proton run in 2015, two electron lenses were used to partially compensate for the head-on beam-beam effect for the first time. Here, we describe the design of the current electron lens, detailing the hardware modifications made after the 2014 commissioning run with heavy ions. A new electron gun with 15-mm diameter cathode is characterized. The electron beam transverse profile was measured using a YAG screen and fitted with a Gaussian distribution. During operation, the overlap of the electron and proton beams was achieved using the electron backscattering detector in conjunction with an automated orbit control program.
Authors:
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  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
Publication Date:
OSTI Identifier:
1183853
Report Number(s):
BNL--107420-2015-CP
R&D Project: KBCH139; 18064; KB0202011; TRN: US1500220
DOE Contract Number:
SC00112704
Resource Type:
Conference
Resource Relation:
Conference: 6th International Particle Accelerator Conference (IPAC’15), Richmond, VA (United States), 3-8 May 2015
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ELECTRON BEAMS; PROTON BEAMS; BROOKHAVEN RHIC; ELECTROMAGNETIC LENSES; GAUSS FUNCTION; GEV RANGE 10-100; ELECTRON GUNS; DESIGN; MODIFICATIONS; ORBITS; POLARIZED BEAMS; BEAM-BEAM INTERACTIONS; BEAM PROFILES