Abstract

This contribution describes the latest milestones of a multiyear program to build and operate a compact−300kVdc high voltage photogun with inverted insulator geometry and alkali-antimonide photocathodes. Photocathode thermal emittance measurements and quantum efficiency charge lifetime measurements at average current up to 4.5 mA are presented, as well as an innovative implementation of ion generation and tracking simulations to explain the benefits of a biased anode to repel beam line ions from the anode-cathode gap, to dramatically improve the operating lifetime of the photogun and eliminate the occurrence of micro-arc discharges.

Details

Title
Compact −300  kV dc inverted insulator photogun with biased anode and alkali-antimonide photocathode
Author
Hernandez-Garcia, C  VIAFID ORCID Logo  ; Adderley, P; Bullard, B; Benesch, J; Grames, J  VIAFID ORCID Logo  ; Gubeli, J; Hannon, F; Hansknecht, J; Jordan, J; Kazimi, R; Krafft, G A; Mamun, M A; Poelker, M; Stutzman, M L; Suleiman, R; Tiefenback, M; Wang, Y; Zhang, S
Section
ARTICLES
Publication year
2019
Publication date
Nov 2019
Publisher
American Physical Society
e-ISSN
24699888
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1103/PhysRevAccelBeams.22.113401
ProQuest document ID
2551580203
Copyright
© 2019. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.