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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 12: AKBP Poster Session
AKBP 12.3: Poster
Thursday, March 21, 2024, 11:00–14:00, Poster A
Adaptive automated GaAs photocathode activation procedure for Photo-CATCH* — •Markus Engart, Joachim Enders, Maximilian Herbert, Maximilian Meier, Julian Schulze, and Victor Winter — Institut für Kernphysik, Fachbereich Physik, Technische Universität Darmstadt, Darmstadt, Germany
Photocathodes based on GaAs are a common source of spin-polarized electrons for particle accelerators. To achieve a sufficient yield of electrons with a GaAs semiconductor, the cathodes are activated to negative electron affinity by applying a thin layer of cesium and an oxidant, in our case O2.The activation process is generally done manually, following an established scheme such as Co-Deposition (Co-De), i.e., the simultaneous application of Cs and O2. This Contribution presents the development of an adaptive algorithm for the automation of Co-De activations and its implementation at the Photo-CATCH test stand.
*Work supported by DFG (GRK 2128 AccelencE, project number 264883531)
Keywords: GaAs; Spin-polarization; Photocathodes; Automated Activation; Photo-CATCH