A laddertron modulation system to correct a repetitive charging pattern

Abstract A technique is described which has enabled a laddertron chain, which had a distinct charging pattern but was otherwise in good condition, to be used in the Daresbury tandem and still achieve excellent output beam energy stability. A phase timing marker from the laddertron was used to add a simple correction waveform to the upcharge power supply voltage each rotation and cancel out the charging pattern.