Emission current regulator for ion cyclotron resonance spectrometers using an optical coupler. II.
An emission current control circuit for ion cyclotron resonance spectrometers has been constructed which maintains a constant beam current in the range 10(-11)-10(-6) A with pulsed grid modulation. It regulates emission currents by automatically adjusting grid bias voltages with reference to a feedback signal. A solid state optical coupler is employed to transmit the feedback signal to a grid biasing circuit having a floating common voltage to accelerate electrons. Control to better than 0.1%/h is possible at any emission current between 10(-10) and 10(-6) A, and control to 0.3%/h at 10(-11) A.
Amano
C
C
Department of Engineering Physics, The University of Electro-Communications, Chofugaoka, Chofu, Tokyo, 182 Japan.
Inoue
M
M