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Title: Cathode performance during two beam operation of the high current high polarization electron gun for eRHIC

Two electron beams from two activated bulk GaAs photocathodes were successfully combined during the recent beam test of the High Current High Polarization Electron gun for eRHIC. The beam test took place in Stangenes Industries in Palo Alto, CA, where the cathodes were placed in diagonally opposite locations inside the high voltage shroud. No significant cross talking between the cathodes was found for the pertinent vacuum and low average current operation, which is very promising towards combining multiple beams for higher average current. This paper describes the cathode preparation, transport and cathode performance in the gun for the combining test, including the QE and lifetimes of the photocathodes at various steps of the experiment.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Transfer Engineering and Manufacturing, Inc., Fremont, CA (United States)
  3. Stangenes Industries, Palo Alto, CA (United States)
Publication Date:
OSTI Identifier:
1188271
Report Number(s):
BNL--107441-2015-CP
R&D Project: KBCH139; KB0202011; TRN: US1500265
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; PHOTOCATHODES; ELECTRIC CURRENTS; ELECTRON GUNS; GALLIUM ARSENIDES; TESTING; PERFORMANCE; SPIN ORIENTATION; LIFETIME; TRANSPORT; CHEMICAL ACTIVATION; BROOKHAVEN RHIC; QUANTUM EFFICIENCY