PoS - Proceedings of Science
Volume 324 - XVII International Workshop on Polarized Sources, Targets & Polarimetry (PSTP2017) - Polarized electron sources
First setup for cooled GaAs cathodes with increased charge lifetime
T. Eggert*, J. Enders, M. Espig, Y. Fritzsche, N. Kurichiyanil, M. Wagner and S. Weih
Full text: pdf
Pre-published on: May 31, 2018
Published on: June 14, 2018
GaAs photocathodes can be used for generation of highly polarized electron beams. For high-
current applications it is necessary to maximize the charge lifetime of the cathode material to
ensure reliable operation. It is expected to increase the local vacuum conditions by cryogenic
cooling of the electrode and a local subvolume, due to cryogenic adsorption of reactive residual
gas molecules at the surrounding walls. This both protects the sensitive negative-electron-affinity
surface of the cathode and allows a higher laser power deposited in the material, resulting in higher
possible beam currents. An electrostatic bend is introduced to reduce Ion-backbombardment and
further increase the cathode lifetime. To measure the characteristics of such a cryogenic source, a
dedicated set-up is being developed at the Photo-CATCH test facility in Darmstadt, Germany.
DOI: https://doi.org/10.22323/1.324.0017
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