Implementation of a Polarized Electron Source at the S-DALINAC

At the superconducting 130 MeV Darmstadt electron linac S-DALINAC a source of polarized electrons is being installed, extending the experimental capabilities with polarized electrons and photons for nuclear structure studies at low momentum transfers. The polarized source generates electrons by irradiating a GaAs cathode with pulsed Ti:Sapphire and diode lasers and has been set up and commissioned at a test stand including electrostatic preacceleration to 100 keV, a Wien filter for spin manipulation, a Mott polarimeter for polarization measurement and a chopperprebuncher system. Various polarimeters will be installed to monitor the beam polarization at all experimental sites. We report on the S-DALINAC, the results from the operation of the source at an offline teststand, the implementation of the polarized source and the polarimeter research and development.