Heat load of a P-doped GaAs photocathode in SRF electron gun
Abstract
Many efforts were made over the last decades to develop a better polarized electron source for the high energy physics. Several laboratories operate DC guns with the Gallium-Arsenide photo-cathode, which yield a highly polarized electron beam. However, the beam's emittance might well be improved using a Superconducting RF electron gun, which delivers beams of higher brightness than DC guns does, because the field gradient at the cathode is higher. SRF guns with metal cathodes and CsTe cathodes have been tested successfully. To produce polarized electrons, a Gallium-Arsenide photo-cathode must be used: an experiment to do so in a superconducting RF gun is under way at BNL. Since the cathode will be normal conducting, the problem about the heat load stemming from the cathode arises. We present our measurements of the electrical resistance of GaAs at cryogenic temperatures, a prediction of the heat load and the verification by measuring the quality factor of the gun with and without cathode.
- Authors:
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
- Sponsoring Org.:
- DOE - Office Of Science
- OSTI Identifier:
- 1013487
- Report Number(s):
- BNL-90778-2010-CP
R&D Project: KBCH139; KB0202011; TRN: US1102486
- DOE Contract Number:
- DE-AC02-98CH10886
- Resource Type:
- Conference
- Resource Relation:
- Conference: First International Particle Accelerator Conference (IPAC) 2010; Kyoto, Japan; 20100523 through 20100528
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; ACCELERATORS; BNL; BRIGHTNESS; CATHODES; CRYOGENICS; ELECTRIC CONDUCTIVITY; ELECTRON BEAMS; ELECTRON GUNS; ELECTRON SOURCES; ELECTRONS; FORECASTING; HIGH ENERGY PHYSICS; PHOTOCATHODES; QUALITY FACTOR; VERIFICATION; relativistic heavy ion collider
Citation Formats
Wang, E, Ben-Zvi, I, Kewisch, J, Burrill, A, Rao, T, Wu, Q, Jain, A, Gupta, R, and Holmes, D. Heat load of a P-doped GaAs photocathode in SRF electron gun. United States: N. p., 2010.
Web.
Wang, E, Ben-Zvi, I, Kewisch, J, Burrill, A, Rao, T, Wu, Q, Jain, A, Gupta, R, & Holmes, D. Heat load of a P-doped GaAs photocathode in SRF electron gun. United States.
Wang, E, Ben-Zvi, I, Kewisch, J, Burrill, A, Rao, T, Wu, Q, Jain, A, Gupta, R, and Holmes, D. 2010.
"Heat load of a P-doped GaAs photocathode in SRF electron gun". United States. https://www.osti.gov/servlets/purl/1013487.
@article{osti_1013487,
title = {Heat load of a P-doped GaAs photocathode in SRF electron gun},
author = {Wang, E and Ben-Zvi, I and Kewisch, J and Burrill, A and Rao, T and Wu, Q and Jain, A and Gupta, R and Holmes, D},
abstractNote = {Many efforts were made over the last decades to develop a better polarized electron source for the high energy physics. Several laboratories operate DC guns with the Gallium-Arsenide photo-cathode, which yield a highly polarized electron beam. However, the beam's emittance might well be improved using a Superconducting RF electron gun, which delivers beams of higher brightness than DC guns does, because the field gradient at the cathode is higher. SRF guns with metal cathodes and CsTe cathodes have been tested successfully. To produce polarized electrons, a Gallium-Arsenide photo-cathode must be used: an experiment to do so in a superconducting RF gun is under way at BNL. Since the cathode will be normal conducting, the problem about the heat load stemming from the cathode arises. We present our measurements of the electrical resistance of GaAs at cryogenic temperatures, a prediction of the heat load and the verification by measuring the quality factor of the gun with and without cathode.},
doi = {},
url = {https://www.osti.gov/biblio/1013487},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 23 00:00:00 EDT 2010},
month = {Sun May 23 00:00:00 EDT 2010}
}