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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 3: Injectors, Laser II

AKBP 3.8: Vortrag

Montag, 14. März 2016, 18:15–18:30, S1/05 23

The ELSA Laser Beamline for Electron Polarization Measurements via Compton Backscattering — •Michael Switka, Florian Hinterkeuser, Rebecca Koop, and Wolfgang Hillert — Electron Stretcher Facility ELSA, Physics Institute of Bonn University

The Electron Stretcher Facility ELSA provides a spin polarized electron beam with energies of 0.5 - 3.2 GeV for double polarization hadron physics experiments. As of 2015, the laser beamline of the polarimeter based on Compton backscattering restarted operation. It consists of a cw disk laser with design total beam power of 40 W and features two polarized 515 nm photon beams colliding head-on with the stored electron beam in ELSA. The polarization measurement is based on the vertical profile asymmetry of the back-scattered photons, which is dependent on the polarization degree of the stored electron beam. After recent laser repairs, beamline and detector modifications, the properties of the beamline have been determined and first measurements of the electron polarization degree were conducted. The beamline performance and first measurements are presented.