Development of an active phase stabilization system for the S-DALINAC injector

During operation of the S-DALINAC time-dependent beam phase variations were observed at the injector accelerator. These deviations can exceed 5° over several hours and have to be compensated manually by the operator to maintain beam quality, energy spread and acceleration efficiency. To overcome this situation, a feedback algorithm has been developed, which uses the measured beam phase to adjust the setphase of an active prebuncher cavity in order to correct existing deviations from the desired phase using time-of-flight effects. To quantify the effectiveness of this feedback, measurements are presented showing a reduction in beam phase deviations by 85%.