Specialized Optical Pulse Picker for Beam Diagnostics in Storage Ring

The non-uniformity, longitudinal oscillations, and space charge effects in a multi-bunch filled electron stor-age ring can lead to significant deviations in the meas-urement of longitudinal beam parameters. Selecting a single bunch for measurement can effectively improve the measurement accuracy of longitudinal beam parame-ter, under normal multi-bunch operation mode. This pa-per introduces an optical pulse selection system based on an RTP crystal Pockels cell, which is controlled by fast electronics and high-voltage electronics, to study the complex longitudinal beam dynamics. By adjusting the driving voltage frequency and trigger delay of the high-voltage driver, precise selection of single pulses in a multi-bunch filling mode can be achieved. Offline cali-bration experiments have verified the potential feasibility of selecting specific bunches or bunch trains within the multi-bunch operation, which is of great significance for diagnosing longitudinal characteristics and instabilities of the beam in electron storage rings.