Multichannel counter for molecular beam time-of-flight experiments

A simple apparatus to measure the number of pulses present in 65 successive time intervals (channels) following a trigger event and to average over up to 32000 trigger repetitions is described. The minimum channel length is 1 mu s and the maximum counting rate is 25 MHz. The apparatus specifically built for a time-of-flight molecular beam apparatus can be fruitfully used in other applications, for instance photon counting.