Switching regulator emission control circuit for ion sources

An electron emission control circuit of the switching regulator type operating at 100 kHz has been developed which maintains a constant emission current within 0.1 percent for a cathode power demand variation of approximately 100 percent. The power output stage has an efficiency of 67 percent, and the overall efficiency is 45 percent when driving a thoria-coated iridium cathode having a nominal resistance at operating temperature of 2.5 Ω. Under optimum conditions, the bus power demand is 1.75 W. The circuit is useful in controlling the electron emission current of ion sources in applications which involve a substantial variation of the cathode work function, such as oxygen partial pressure measurements over a large dynamic range. (U.S.)