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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 12: AKBP Poster Session

AKBP 12.2: Poster

Thursday, March 21, 2024, 11:00–14:00, Poster A

PID-based beam current stabilisation system for Photo-CATCH* — •Victor Winter, Joachim Enders, Markus Engart, Maximilian Herbert, Maximilian Meier, and Julian Schulze — Institut für Kernphysik, Fachbereich Physik, Technische Universität Darmstadt, Darmstadt, Germany

Photo-CATCH is a test stand for research on GaAs photocathodes that can be used to generate spin-polarized electrons. It features a -60 kV DC photo-electron source with adjacent beamline. A stable current is required for operation of a particle accelerator. For a photo-electron source, this can be provided by altering the incident laser power on the photocathode surface. A PID controller can be used for this purpose, controlling a λ/2-plate to regulate the power of the laser beam and hence the emitted beam current. This contribution will present development and testing of a PID controller for beam current stabilisation at Photo-CATCH.

*Work supported by DFG (GRK 2128 AccelencE, project number 264883531)

Keywords: Electron Source; GaAs; Photocathodes; PID Controller; Beam current stabilization