skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Increasing charge lifetime in dc polarized electron guns by offsetting the anode

Journal Article · · Physical Review Accelerators and Beams
; ; ; ;

Charge lifetime of strained superlattice Gallium Arsenide photocathodes in dc guns is limited by ion back bombardment. In this work, we propose and present simulation results for an offset anode scheme to increase charge lifetime in dc guns. In this scheme, the axial symmetry of the cathode-anode configuration is broken by offsetting the anode transversely, while keeping the laser spot on the electrostatic center. This eliminates the bombardment of high energy ions on the cathode and enables maximum usage of the available cathode area. Depending on the size of the available cathode area, this method can increase the charge lifetime by an order of magnitude compared to the current best alternative method. An anode assembly, capable of in-vacuum movement, is required for this method, which has been designed and fabricated at Brookhaven National Laboratory.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-98CH10886; SC0012704
OSTI ID:
1547969
Alternate ID(s):
OSTI ID: 1558917
Report Number(s):
BNL-212021-2019-JAAM; PRABCJ; 083401
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 8; ISSN 2469-9888
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (19)

Charge and fluence lifetime measurements of a dc high voltage GaAs photogun at high average current journal April 2011
Development of a high average current polarized electron source with long cathode operational lifetime journal February 2007
Polarized beams for electron accelerators journal September 2011
Surface science analysis of GaAs photocathodes following sustained electron beam delivery journal June 2012
The SLAC Polarized Electron Source
  • Clendenin, J. E.
  • SPIN 2002: 15th International Spin Physics Symposium and Workshop on Polarized Electron Sources and Polarimeters, AIP Conference Proceedings https://doi.org/10.1063/1.1607293
conference January 2003
Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies journal May 2016
Highly polarized electrons from GaAs–GaAsP and InGaAs–AlGaAs strained-layer superlattice photocathodes journal May 2005
Load-locked dc high voltage GaAs photogun with an inverted-geometry ceramic insulator journal January 2010
A source of polarized electrons based on photoemission of GaAsP
  • Hartmann, W.; Conrath, D.; Gasteyer, W.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 286, Issue 1-2 https://doi.org/10.1016/0168-9002(90)90200-P
journal January 1990
The MAMI source of polarized electrons
  • Aulenbacher, K.; Nachtigall, Ch; Andresen, H. G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 391, Issue 3 https://doi.org/10.1016/S0168-9002(97)00528-7
journal June 1997
A Biased Anode to Suppress Ion Back-Bombardment in a DC High Voltage Photoelectron Gun conference January 2008
Record high-average current from a high-brightness photoinjector journal January 2013
The bates polarized electron source
  • Cates, G. D.; Hughes, V. W.; Michaels, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 278, Issue 2 https://doi.org/10.1016/0168-9002(89)90846-2
journal June 1989
High current polarized electron source for future eRHIC conference January 2018
Ion trapping and cathode bombardment by trapped ions in dc photoguns journal August 2007
Fluctuations Do Matter: Large Noise-Enhanced Halos in Charged-Particle Beams journal December 2003
Effects of ion bombardment on bulk GaAs photocathodes with different surface-cleavage planes journal October 2016
The Stanford linear accelerator polarized electron source
  • Alley, R.; Aoyagi, H.; Clendenin, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 365, Issue 1 https://doi.org/10.1016/0168-9002(95)00450-5
journal November 1995
Comparison of dc and superconducting rf photoemission guns for high brightness high average current beam production journal July 2011

Similar Records

Improving the Operational Lifetime of the CEBAF Photo-Gun by Anode Biasing
Conference · Sun Aug 01 00:00:00 EDT 2021 · OSTI ID:1547969
+8 more
Charge Lifetime Study of K2CsSb Photocathode Inside a JLAB DC High Voltage Gun
Journal Article · Sat Oct 01 00:00:00 EDT 2011 · Proceedings of IPAC2011 · OSTI ID:1547969
+3 more
Charge Lifetime Study of K2CsSb Photocathode Inside a Jlab DC High Voltage Gun
Conference · Thu Sep 01 00:00:00 EDT 2011 · OSTI ID:1547969
+3 more

Related Subjects

43 PARTICLE ACCELERATORS