Proceedings of the North American Particle Accelerator Conference
North American Particle Accelerator Conference (5th), August 7-12, 2022, Albuquerque, New Mexico
Polarized electrons from GaAs photocathodes have been key to some of the highest-impact results of the Jefferson Lab science program over the past 30 years. During this time, various studies have given insight into improving the operational lifetime of these photocathodes in DC high-voltage photo-guns while using lasers with spatial Gaussian profiles of typically 0.5 mm to 1 mm FWHM, cathode voltages of 100 kV to 130 kV, and a wide range of beam currents up to multiple mA. In this contribution, we show recent experimental data from a 100 kV to 180 kV setup and describe our progress at predicting the lifetime based on the calculable dynamics of ionized gas molecules inside the gun. These new experimental studies at Jefferson Lab are specifically aimed at exploring the ion damage of higher-voltage guns being built for injectors.
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Original Publication Citation
Bruker, M., Grames, J., Hernández-García, C., Poelker, M., Zhang, S., Lizárraga-Rubio, V., Valerio-Lizárraga, C., & Yoskowitz, J. T. (2022). New results at JLab describing operating lifetime of GaAs photo-guns. In S. Biedron, E. Simakov, S. Milton, P.M. Anisimov, & V.R.W. Schaa (Eds.) Proceedings of the North American Particle Accelerator Conference (pp.644-647). JACOW. https://doi.org/10.18429/JACoW-NAPAC2022-WEPA13
Bruker, M.; Grames, J.; Hernández-García, C.; Poelker, M.; Zhang, S.; Lizárraga-Rubio, V.; Valerio-Lizárraga, C.; and Yoskowitz, Joshua T., "New Results at JLab Describing Operating Lifetime of GaAs Photo-Guns" (2022). Physics Faculty Publications. 707.