DOE OSTI · 3028164
An R&D program for milliampere spin-polarized electron beams
Abstract
The electron injector driving the positron conversion target for Ce+BAF requires a spin-polarized beam with at least 1 mA of average current. While the parameters are not unusual from a beam dynamics point of view, the high average current is challenging due to the finite charge lifetime of the GaAs-based high-polarization photocathodes, even when operated in state-of-the-art load-lock photo-guns. We discuss the dominant limitations and present a systematic experimental program at the Gun Test Stand aiming to overcome them. With a multi-pronged approach involving a redesign of the photo-gun electrodes and an optimized drive laser profile, we hope to demonstrate a charge lifetime in excess of 1 kC from a high-polarization photocathode, mitigating one of the main risks in the injector design.
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Bruker, Max [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000170059153), Hernandez-Garcia, Carlos [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Blume, Gregory [Old Dominion Univ., Norfolk, VA (United States)], Carucci, Jessica [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Grames, Joseph [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)] (ORCID:0000000193908752), Harding, Keith [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Hays, Gary E. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Mamun, Md Abdullah [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Stutzman, Marcy [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Zhang, Shukui [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]. 2026-03-23. An R&D program for milliampere spin-polarized electron beams. https://doi.org/10.2172/3028164
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