Post-acceleration bunching system for a CN-type Van de Graaff accelerator

Abstract The 1.5 ns fwhm pulses delivered with 2.5 MHz repetition rate by the CN Van de Graaff accelerator of CBNM have been further compressed. The time compression is based on a two-gap buncher powered with a frequency of 105 MHz. The synchronization with a pickup electrode signal is realized by a gated phase lock device which is described as well as the electronics used to perform time resolution measurements. Pulses with fwhm ⩽ 0.2 ns were obtained.