Paper | Title | Page |
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WEPAB104 | Improving the Operational Lifetime of the CEBAF Photo-Gun by Anode Biasing | 2840 |
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Funding: U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. The operating lifetime of GaAs-based photocathodes in DC high voltage electron photo-guns is dominated by the ionization rate of residual beamline gas molecules. In this work, experiments were performed to quantify the improvement in photocathode charge lifetime by biasing the photo-gun anode with a positive voltage, which repels ions generated downstream of the anode. The photo-cathode charge lifetime improved by almost a factor of two when the anode was biased compared to the usual grounded configuration. Simulations were performed using the particle tracking code General Particle Tracer (GPT) with a new custom element. The simulation results showed that both the number and energy of ions play a role in the pattern of QE degradation. The experiment results and conclusions supported by GPT simulations will be presented. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB104 | |
About • | paper received ※ 20 May 2021 paper accepted ※ 02 June 2021 issue date ※ 18 August 2021 | |
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