München 2019 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 1: Particle Sources and Radiofrequency 1

AKBP 1.1: Vortrag

Montag, 18. März 2019, 14:00–14:15, HS 8

Setup for cooled GaAs cathodes with increased charge lifetime — •Tobias Eggert, Joachim Enders, Martin Espig, Yuliya Fritsche, Dominik Gappa, Neeraj Kurichiyanil, and Markus Wagner — Institut für Kernphysik, TU Darmstadt

For high-current applications with spin-polarized electrons emitted from GaAs-photocathodes it is necessary to maximize the charge lifetime of the cathode material to ensure reliable operation. By using a cryogenic subvolume it is expected to improve the local vacuum conditions around the GaAs cathode, with its sensitive negative-electron-affinity surface. Furthermore, the cooling of the cathode itself also allows a higher laser power to be deposited in the material, resulting in higher possible currents. To further increase the lifetime, an electrostatic bend is introduced leading to the reduction of ion-backbombardment. Such an electron source is presently being developed at the Photo-CATCH test facility in Darmstadt. The current status of the source as well as future plans will be presented. Work supported by DFG (GRK 2128) and BMBF (05H18RDRB1).