Wuppertal 2015 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 14: Injectors, Lasers

AKBP 14.8: Talk

Thursday, March 12, 2015, 18:30–18:45, BZ.08.06 (HS 1)

Compton Polarimetry at ELSA - Properties of the Laser System — •Florian Hinterkeuser, Wolfgang C.A. Hillert, Rebecca Koop, and Michael T. Switka — Elektronen-Stretcher-Anlage ELSA, Physikalisches Institut, Universität Bonn

For double polarization experiments, the Electron Stretcher Facility ELSA provides a spin polarized electron beam with energies ranging from 0.5 to 3.5 GeV. Since the initial polarization is not preserved during the acceleration and storage process, it is crucial to monitor the electron polarization in the stretcher ring. Hence the installation of a Compton polarimeter, consisting of a laser and a silicon microstrip detector system, is in progress. The laser system provides two polarized photon beams, which are scattered off the stored electrons. After recent inevitable repairs, the final laser properties have been measured in order to obtain a stable system with optimized performance. The laser properties and the expected performance are presented.