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Improving the Operational Lifetime of the CEBAF Photo-Gun by Anode Biasing
- Publication Year :
- 2021
- Publisher :
- JACoW Publishing, Geneva, Switzerland, 2021.
-
Abstract
- 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.<br />Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
- Subjects :
- MC2: Photon Sources and Electron Accelerators
Accelerator Physics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi...........d34e548028361bbe7f4e6b2d33677012
- Full Text :
- https://doi.org/10.18429/jacow-ipac2021-wepab104