Document Type

Conference Paper

Publication Date




Publication Title

NAPAC 2022: Proceedings of the North American Particle Accelerator Conference




An electron beam with high bunch charge and high repetition rate is required for electron cooling of the ion beam to achieve the high luminosity required for the proposed electron-ion colliders. An improved design of the 300 kV DC high voltage photogun at Jefferson Lab was incorporated toward overcoming the beam loss and space charge current limitation experienced in the original design. To reach the bunch charge goal of ~ few nC within 75 ps bunches, the existing DC high voltage photogun electrodes and anode-cathode gap were modified to increase the longitudinal electric field (Ez) at the photocathode. The anode-cathode gap was reduced to increase the Ez at the photocathode, and the anode aperture was spatially shifted with respect to the beamline longitudinal axis to minimize the beam deflection introduced by the geometric asymmetry of the inverted insulator photogun. The electrostatic design and beam dynamics simulations were performed to determine the required modification. Beam-based measurement from the modified gun confirmed the reduction of the beam deflection, which is presented in this contribution.


Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.

Original Publication Citation

Mamun, M. A., Bullard, D. B., Delayen, J. R., Grames, J. M., Hernandez-Garcia, C., Krafft, G. A., Palacios Serrano, G. G., Poelker, M., Suleiman, R., & Wijethunga, S. A. K. (2022). In S. Biedron, E. Simakov, S. Milton, P.M. Anisimov, & V.R.W. Schaa (Eds.) NAPAC2022: Proceedings of the North American Particle Accelerator Conference (pp. 655-658). JACoW.


0000-0002-0328-5828 (Krafft)