Title :
Filament heater current modulation for increased filament lifetime
Author :
Paul, J.D. ; Williams, H.E., III
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
A circuit to eliminate 100 A heater currents from filaments during the arc pulse was developed. The magnetic field due to the 100 A current tends to hold electrons to the filament, decreasing the arc current. By eliminating this magnetic field, the arc should be more efficient, allowing the filaments to run at a lower average heater current. This should extend the filament lifetime. The circuit development and preliminary filament results are discussed
Keywords :
arcs (electric); electric heating; heating elements; ion sources; magnetic fields; 100 A; arc current; arc pulse; filament heater current modulation; filament lifetime improvement; ion sources; magnetic field elimination; Circuits; Ion sources; MOSFETs; Magnetic fields; Power amplifiers; Pulse amplifiers; Pulse modulation; Pulsed power supplies; Sputtering; Switches;
Conference_Titel :
Power Modulator Symposium, 1996., Twenty-Second International
Conference_Location :
Boca Raton, FL
Print_ISBN :
0-7803-3076-5
DOI :
10.1109/MODSYM.1996.564495
