Starting Circuit for Hollow Cathode Ion Source
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
A simplified starting circuit for a hollow cathode in a broad-beam ion source has been developed. The invention utilizes existing ion source power supplies in a different configuration during starting, with the addition of several minor components. This starting circuit eliminates the high voltage negative power supply needed in the past. The ion source in this case starts at high ion energy. An alternative embodiment allows low ion energy starting, again without the previously needed negative high voltage power supply. The actual operation of a hollow cathode electron source has been described in detail elsewhere . Hollow cathodes are often used as electron sources in place of hot, thermionic filaments in broad-beam ion thrusters  and various other ion sources .