Compact $\ensuremath{-}300\text{ }\mathrm{kV}$ dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

Open Access

Compact $- 300 kV$ dc inverted insulator photogun with biased anode and alkali-antimonide photocathode

C. Hernandez-Garcia, P. Adderley, B. Bullard, J. Benesch, J. Grames, J. Gubeli, F. Hannon, J. Hansknecht, J. Jordan, R. Kazimi, G. A. Krafft, M. A. Mamun, M. Poelker, M. L. Stutzman, R. Suleiman, M. Tiefenback, Y. Wang, S. Zhang, H. Baumgart, G. Palacios-Serrano, S. Wijethunga, J. Yoskowitz, C. A. Valerio Lizarraga, R. Montoya Soto, and A. Canales Ramos

Phys. Rev. Accel. Beams 22, 113401 – Published 13 November 2019

Abstract

This contribution describes the latest milestones of a multiyear program to build and operate a compact $- 300 kV$ dc 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.

7 More

Received 13 August 2019
Corrected 30 January 2020

DOI:https://doi.org/10.1103/PhysRevAccelBeams.22.113401

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Beam dynamics

Electron sources Laser-system design

Accelerators & Beams

Corrections

30 January 2020

Correction: The names and affiliations of the second and nineteenth through twenty-second authors were missing in the original publication and have been inserted. Missing support information in the Acknowledgments section has been inserted.