STATUS OF ELECTRON BUNCH LENGTH MEASUREMENTS WITH ELECTRO- OPTICAL METHODS AT THE SLS LINAC

The measurement of electron bunch-length with sub-ps time resolution is mandatory for future X-ray free electron lasers. The correlation of coherent far microwave transition radiation, emitted by short relativistic electron bunches, and laser radiation in electro-optical crystals represents one of the most promising ap-proaches. Therefore, two bunch-length monitors, applying electro-optical techniques have been set-up at the SLS Linac. This report presents the experimental set-ups and summarizes the status of the measure-ments, which have been performed in close collaboration between the PSI diagnostics group and physicists from DESY (Deutsches Elektronen Synchrotron, Hamburg, Germany