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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:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1547969
Alternate Identifier(s):
OSTI ID: 1558917
Report Number(s):
BNL-212021-2019-JAAM
Journal ID: ISSN 2469-9888; PRABCJ; 083401
Grant/Contract Number:  
AC02-98CH10886; SC0012704
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams 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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Cited by: 2 works
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