Ion source control system

摘要

A gridless ion source operates from a control system ( 201 ) that generates an anode voltage ( 215 ) comprising a mains rectified signal such that the anode voltage modulates between a first voltage above a threshold and a second voltage below the threshold. The mains rectified signal is provided by transformer ( 210 ) receiving a mains input ( 211 ). The output of the transformer ( 213 ) is rectified by a bridge rectifier ( 214 ). In preferred embodiments, the threshold is an ionization threshold such that the ion current is initiated and extinguished in every cycle.