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

Abstract

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.

Authors:
 [1];  [1];  [2];  [3];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
  3. Stony Brook Univ., NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1547969
Alternate Identifier(s):
OSTI ID: 1558917
Report Number(s):
BNL-212021-2019-JAAM
Journal ID: ISSN 2469-9888; PRABCJ
Grant/Contract Number:  
SC0012704; AC02-98CH10886
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 8; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Rahman, Omer, Wang, Erdong, Ben-Zvi, Ilan, Biswas, Jyoti, and Skaritka, John. Increasing charge lifetime in dc polarized electron guns by offsetting the anode. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.083401.
Rahman, Omer, Wang, Erdong, Ben-Zvi, Ilan, Biswas, Jyoti, & Skaritka, John. Increasing charge lifetime in dc polarized electron guns by offsetting the anode. United States. doi:10.1103/PhysRevAccelBeams.22.083401.
Rahman, Omer, Wang, Erdong, Ben-Zvi, Ilan, Biswas, Jyoti, and Skaritka, John. Tue . "Increasing charge lifetime in dc polarized electron guns by offsetting the anode". United States. doi:10.1103/PhysRevAccelBeams.22.083401.
@article{osti_1547969,
title = {Increasing charge lifetime in dc polarized electron guns by offsetting the anode},
author = {Rahman, Omer and Wang, Erdong and Ben-Zvi, Ilan and Biswas, Jyoti and Skaritka, John},
abstractNote = {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.},
doi = {10.1103/PhysRevAccelBeams.22.083401},
journal = {Physical Review Accelerators and Beams},
number = 8,
volume = 22,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.22.083401

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Works referenced in this record:

The Stanford linear accelerator polarized electron source
journal, November 1995

  • 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
  • DOI: 10.1016/0168-9002(95)00450-5

The bates polarized electron source
journal, June 1989

  • 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
  • DOI: 10.1016/0168-9002(89)90846-2

A source of polarized electrons based on photoemission of GaAsP
journal, January 1990

  • 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
  • DOI: 10.1016/0168-9002(90)90200-P

Development of a high average current polarized electron source with long cathode operational lifetime
journal, February 2007

  • Sinclair, C. K.; Adderley, P. A.; Dunham, B. M.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 10, Issue 2
  • DOI: 10.1103/PhysRevSTAB.10.023501

Highly polarized electrons from GaAs–GaAsP and InGaAs–AlGaAs strained-layer superlattice photocathodes
journal, May 2005

  • Nishitani, T.; Nakanishi, T.; Yamamoto, M.
  • Journal of Applied Physics, Vol. 97, Issue 9
  • DOI: 10.1063/1.1886888

Charge and fluence lifetime measurements of a dc high voltage GaAs photogun at high average current
journal, April 2011

  • Grames, J.; Suleiman, R.; Adderley, P. A.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 14, Issue 4
  • DOI: 10.1103/PhysRevSTAB.14.043501

Polarized beams for electron accelerators
journal, September 2011


The MAMI source of polarized electrons
journal, June 1997

  • 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
  • DOI: 10.1016/S0168-9002(97)00528-7

The Large Hadron Electron Collider
journal, May 2013


Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies
journal, May 2016


Load-locked dc high voltage GaAs photogun with an inverted-geometry ceramic insulator
journal, January 2010

  • Adderley, P. A.; Clark, J.; Grames, J.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 13, Issue 1
  • DOI: 10.1103/PhysRevSTAB.13.010101

Record high-average current from a high-brightness photoinjector
journal, January 2013

  • Dunham, Bruce; Barley, John; Bartnik, Adam
  • Applied Physics Letters, Vol. 102, Issue 3
  • DOI: 10.1063/1.4789395

Effects of ion bombardment on bulk GaAs photocathodes with different surface-cleavage planes
journal, October 2016


Surface science analysis of GaAs photocathodes following sustained electron beam delivery
journal, June 2012

  • Shutthanandan, V.; Zhu, Z.; Stutzman, M. L.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 15, Issue 6
  • DOI: 10.1103/PhysRevSTAB.15.063501

Ion trapping and cathode bombardment by trapped ions in dc photoguns
journal, August 2007


Comparison of dc and superconducting rf photoemission guns for high brightness high average current beam production
journal, July 2011

  • Bazarov, Ivan V.; Kim, Allen; Lakshmanan, Manu N.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 14, Issue 7
  • DOI: 10.1103/PhysRevSTAB.14.072001

Fluctuations Do Matter: Large Noise-Enhanced Halos in Charged-Particle Beams
journal, December 2003