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 Laboratory (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. https://doi.org/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. https://doi.org/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 = {Tue Aug 06 00:00:00 EDT 2019},
month = {Tue Aug 06 00:00:00 EDT 2019}
}
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https://doi.org/10.1103/PhysRevAccelBeams.22.083401
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