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Title: Measurements of Photocathode Operational Lifetime at Beam Currents up to 10 mA using an Improved DC High Voltage GaAs Photogun

Abstract

This work extends past research at Jefferson Lab aimed at better appreciating the mechanisms that limit photocathode operational lifetime at high current (> 1 mA). Specifically, the performance of an improved 100 kV DC high voltage load locked photogun will be described. Although difficult to measure directly, we believe the new gun has better vacuum conditions compared to the original gun, as indicated by enhanced photocathode lifetimes exceeding 2000 C using a 1.55 mm diameter drive laser spot at the photocathode. In addition, the dependence of the lifetime on the laser spot size at the photocathode was measured and a charge density lifetime exceeding 106 C/cm2 was measured with a 0.32 mm laser spot diameter.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 (United States)
Publication Date:
OSTI Identifier:
21061854
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 915; Journal Issue: 1; Conference: 17. international spin physics symposium, Kyoto (Japan), 2-7 Oct 2006; Other Information: DOI: 10.1063/1.2750949; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM CURRENTS; CEBAF ACCELERATOR; CHARGE DENSITY; ELECTRIC POTENTIAL; ELECTRON GUNS; ELECTRON SOURCES; GALLIUM ARSENIDES; LASER RADIATION; LIFETIME; PERFORMANCE; PHOTOCATHODES

Citation Formats

Grames, J, Poelker, M, Adderley, P, Brittian, J, Clark, J, Hansknecht, J, Machie, D, Stutzman, M L, and Surles-Law, K. Measurements of Photocathode Operational Lifetime at Beam Currents up to 10 mA using an Improved DC High Voltage GaAs Photogun. United States: N. p., 2007. Web. doi:10.1063/1.2750949.
Grames, J, Poelker, M, Adderley, P, Brittian, J, Clark, J, Hansknecht, J, Machie, D, Stutzman, M L, & Surles-Law, K. Measurements of Photocathode Operational Lifetime at Beam Currents up to 10 mA using an Improved DC High Voltage GaAs Photogun. United States. https://doi.org/10.1063/1.2750949
Grames, J, Poelker, M, Adderley, P, Brittian, J, Clark, J, Hansknecht, J, Machie, D, Stutzman, M L, and Surles-Law, K. 2007. "Measurements of Photocathode Operational Lifetime at Beam Currents up to 10 mA using an Improved DC High Voltage GaAs Photogun". United States. https://doi.org/10.1063/1.2750949.
@article{osti_21061854,
title = {Measurements of Photocathode Operational Lifetime at Beam Currents up to 10 mA using an Improved DC High Voltage GaAs Photogun},
author = {Grames, J and Poelker, M and Adderley, P and Brittian, J and Clark, J and Hansknecht, J and Machie, D and Stutzman, M L and Surles-Law, K},
abstractNote = {This work extends past research at Jefferson Lab aimed at better appreciating the mechanisms that limit photocathode operational lifetime at high current (> 1 mA). Specifically, the performance of an improved 100 kV DC high voltage load locked photogun will be described. Although difficult to measure directly, we believe the new gun has better vacuum conditions compared to the original gun, as indicated by enhanced photocathode lifetimes exceeding 2000 C using a 1.55 mm diameter drive laser spot at the photocathode. In addition, the dependence of the lifetime on the laser spot size at the photocathode was measured and a charge density lifetime exceeding 106 C/cm2 was measured with a 0.32 mm laser spot diameter.},
doi = {10.1063/1.2750949},
url = {https://www.osti.gov/biblio/21061854}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 915,
place = {United States},
year = {Wed Jun 13 00:00:00 EDT 2007},
month = {Wed Jun 13 00:00:00 EDT 2007}
}