STI Publications - View Publication Form #16486
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Publication Information
| Title | Improving the Operational Lifetime of the CEBAF Photo-Gun by Anode Biasing | ||||
| 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. Ions created within the photo-gun potential are accelerated toward the photocathode, leading to a reduction of the photocathode quantum efficiency (QE). 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 method was tested by successively applying and removing the anode bias voltage of the CEBAF photo-gun at the Thomas Jefferson National Accelerator Facility over many months of beam production. The photocathode 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 and electric field mod | ||||
| Author(s) | Joshua Yoskowitz, Joe Grames, Geoffrey Krafft, John Hansknecht, Carlos Hernandez-Garcia, Matthew Poelker, Gabriel Palacios-Serrano, Marcy Stutzman, Riad Suleiman, Sebastiaan Van der Geer, W. Sajini Wijethunga | ||||
| Publication Date | August 2021 | ||||
| Category | Electron/Positron Sources | ||||
| Document Type | Meeting, Proceedings | ||||
| Primary Institution | Thomas Jefferson National Accelerator Facility, Newport News | ||||
| Affiliation | Accelerator Ops, R&D / Ctr For Injectors&Sources / Ctr for Injectors&Sources | ||||
| Funding Source | Nuclear Physics (NP) | ||||
| Proprietary? | No | ||||
| This publication conveys | Technical Science Results | ||||
| Document Numbers |
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| Associated with an experiment | No | ||||
| Associated with EIC | No | ||||
| Supported by Jefferson Lab LDRD Funding | No |
Meeting / Conference
| Meeting Name | IPAC21 |
| Meeting Date | 5/24/2021 |
| Document Subtype | Paper (proceedings only) |
Proceedings
| Title | Proceedings of IPAC 2021 |
| Editor(s) | Liu Lin, John M. Byrd, Regis Neuenschwander, Renan Picoreti, Volker R. W. Schaa |
| Publisher | JACOW |
| Refereed | No |
| Page Number | 2840-2842 |
| Year | 2021 |
Attachments/Datasets/DOI Link
| Document(s) |
wepab104.pdf
(STI Document)
wepab104.pdf
(Accepted Manuscript)
|
| DOI Link | |
| Dataset(s) | (none) |
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