Charge lifetime improvement of the Continuous Electron Beam Accelerator Facility photogun with a biased anode

Yoskowitz, J. T.; Krafft, G. A.; Palacios-Serrano, G.; Wijethunga, S. A. K.; Grames, J.; Hansknecht, J.; Hernandez-Garcia, C.; Poelker, M.; Stutzman, M. L.; Suleiman, R.; Valerio-Lizarraga, C. A.; Van Der Geer, S. B.

doi:10.1103/PhysRevAccelBeams.27.123401

Title: Charge lifetime improvement of the Continuous Electron Beam Accelerator Facility photogun with a biased anode

Journal Article · 03 December 2024 · Physical Review Accelerators and Beams

DOI: https://doi.org/10.1103/PhysRevAccelBeams.27.123401 · OSTI ID:2479376

;

; Hansknecht, J.;

;

GaAs photocathodes in dc high-voltage photoguns are highly susceptible to ion back-bombardment, which reduces the photocathode quantum efficiency and limits the useful operating lifetime for producing polarized electron beams. This paper demonstrates that applying a small positive bias to the photogun anode can significantly suppress ion back-bombardment and increase charge lifetime. This technique was studied extensively using the Continuous Electron Beam Accelerator Facility photogun, where highly polarized electron beams created using a strained-superlattice $GaAs / GaAsP$ photocathode were used and charge lifetimes improved by almost a factor of 2. A new simulation code was developed to model ion production and tracking in order to better understand and explain the factors that led to the performance improvement. Results of the experiments and simulations are discussed in detail. Published by the American Physical Society 2024

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 2479376

Report Number(s):: DOE/OR/23177--7465; JLAB-ACC--24-4031; LA-UR--24-24208; 123401

Journal Information:: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Journal Issue: 12 Vol. 27; ISSN 2469-9888; ISSN PRABCJ

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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