The Power and Polarisation Upgrade Project at the S-DALINAC Injector

The current upgrade for the injector mainly involves the superconducting rf part. In order to increase the maximum current from 60 μA to 150 or 250 μA the power coupler design had to be modified, resulting in major changes in the whole cryo-module. Second, an additional polarized electron source (SPIN) has been set-up at an offline test area. There, the polarized electrons are produced by photoemission at a strained GaAs cathode on a 100 kV platform. The test beamline includes a Wien filter for spin manipulation, a Mott polarimeter for polarization measurement and additional diagnostic elements. We will give an overview to the project, report on the status and present first measurement results including the proof of polarisation.