Göttingen 2025 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 5: Particle Sources

AKBP 5.2: Vortrag

Mittwoch, 2. April 2025, 11:15–11:30, ZHG004

Spin-Polarized Electron Beams at the ELSA Accelerator Facility — •Axel Spreitzer, Klaus Desch, Dennis Proft, and Michael Switka — Physikalisches Institut der Universität Bonn

At the Electron Stretcher Facility (ELSA) in Bonn a spin-polarized electron beam is generated by irradiating a Strained-Layer Superlattice GaAs photocathode. The electron beam converted into a circularly polarized photon beam allows for double polarization hadron physics experiments. After being hibernated for several years, the polarized source is to be characterized and optimized to re-establish regular operation. Current efforts focus on the optimization of the source's laser and its beamline, as well as the investigation of the quantum efficiency of different photocathode crystals. Furthermore, in prospect of improving the overall system performance, plans include the optimization of the electron beamline and enhancing the electron polarization transfer efficiency. The current state of the polarized electron source setup is presented and discussed.

Keywords: Polarized Electrons; Photocathode; Laser