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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/51084
Record Status
Checked
Record Id
51084
Title
Study of the activated GaAs surface for application as an electron source in particle accelerators
Contributors
N Chanlek (STFC Daresbury Lab., Cockcroft Inst., and Manchester Univ.)
,
JD Herbert (STFC Daresbury Lab.)
,
LB Jones (STFC Daresbury Lab.)
,
RM Jones (Cockcroft Inst., and Manchester Univ.)
,
KJ Middleman (STFC Daresbury Lab.)
Abstract
The use of Type III-V semiconductor materials as photocathodes has in recent years become a focus for the High Energy Physics community. Once activated to a Negative Electron Affinity (NEA) state and illuminated by a laser, these materials can be used as a high-brightness source of both polarised and un-polarised electrons in some modern accelerators, e.g., The ALICE (Accelerators and Lasers in Combined Experiments) at Daresbury Laboratory. This paper will focus on the use of Gallium Arsenide (GaAs) as a photocathode, and detail the re-configuration and re-commissioning of two vacuum systems that support standard surface science techniques such as Ultraviolet / X-ray Photoelectron Spectroscopy (UPS/XPS), Low Energy Electron Diffraction (LEED) and Auger Electron Spectroscopy (AES). The paper will present details of cleaning GaAs in order to maximise quantum efficiency and will provide evidence from XPS and LEED to demonstrate what is happening at the atomic level.
Organisation
ASTeC
,
ASTeC-AP
,
ASTeC-VS
,
CI
,
STFC
Keywords
ASTeC 2009-2010
,
GaAs
,
XPS
,
Physics
,
LEED
,
NEA
,
Photocathode
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Paper In Conference Proceedings
Published by the AiP with the PESP08 submissions as part of the SPIN2008 proceedings AiP Conf. Proc 1149, pp 1022 -1026. Is in proceedings of: Polarised Electron Sources and Polarimetry (PESP08), Jefferson Lab, US, 4-8 Oct 2008.
2008 Proc PESP08…ted GaAs Surface.pdf
2008
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