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Persistent URL http://purl.org/net/epubs/work/61858
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Record Id 61858
Title Gallium Arsenide Photocathode Research at Daresbury Laboratory
Abstract Significant effort has been expended over several years by ASTeC to develop and optimise procedures for preparing GaAs photocathodes for use as high–current electron sources in accelerators. We present data showing high levels of Quantum Efficiency (Q.E.) for heterostructure photocathodes when activated with Cs-O and Cs-NF3 procedures, and that the use of NF3 delivers higher Q.E., and conveys greater control during activation in that the final Q.E. level can be set more accurately when using NF3. A limiting factor in the performance of electron accelerators is the transverse energy spread in the photocathode source. We are designing a retarding–field electron calorimeter for the measurement of photoemission current as a function of retarding voltage. From this, we will establish the 2–D energy distribution of the emitted electrons, permitting a comparison of these figures for photocathodes at room temperature and at cryogenic temperatures. The goal is to investigate the possibility of creating an ultra– bright electron source based on GaAs technology.
Organisation ASTeC , ASTeC-AP , ASTeC-VS , CI , STFC
Keywords ASTeC 2011-2012 , Physics
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Language English (EN)
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Paper In Conference Proceedings In 2nd International Particle Accelerator Conference (IPAC11), San Sebastian, Spain, 4-9 Sep 2011, (2011). thpc129.pdf 2011