Progress on Bunch Arrival Time Measurements at ELBE

The superconducting continuous wave (CW) accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is currently upgraded to generate electron bunches with sub picosecond duration, charges of up to 1 nC at repetition rates of up to 500 kHz (CW). The electron pulses are compressed to their desired length using two magnetic chicanes. To measure the timing of the electron bunches with respect to ELBEs RF reference at the target position a Bunch Arrival-time Monitor (BAM) has been setup and commissioned. Improvements concerning the beamline pickup and readout electronics are discussed which leads to a higher temporal resolution. First measurement results carried out are presented.