Title :
A 120kV IGBT modulator for driving a pierce electron gun
Author :
Earley, Lawrence M. ; Brown, Richard W. ; Carlson, Randolph L. ; Ferguson, Patrick ; Haynes, William B. ; Kirbie, Hugh C. ; Russell, Steven J. ; Sigler, Floyd E. ; Smirnova, E.I. ; Wheat, Robert M., Jr.
Author_Institution :
Los Alamos Nat. Lab., NM
Abstract :
An IGBT modulator has been developed to drive a 120 kV, 23 A Pierce electron gun. The modulator is capable of producing pulses up to 10 mus in width at repetition rates up to 10 Hz with no active reset. The pulse rise time on the electron gun will be approximately 2 mus and the remaining 8 mus of flattop is tuned to have a ripple of less than 1 percent rms. The modulator technology was developed from a previous 50 kV prototype. The modulator consists of six boards, each with one EUPEC IGBT that drives a single common step-up transformer wound on METGLAS 2605 SC cores. The six transformer cores share a common bifilar output secondary winding. The modulator uses a fiber optic trigger system and has a high voltage cable output with an epoxy receptacle on the oil end and a ceramic receptacle on the vacuum end. The 120 kV electron gun was manufactured by MDS Co. and will be used to generate sheet electron beams from the standard pencil beam produced by the Pierce electron gun
Keywords :
electron guns; insulated gate bipolar transistors; modulators; optical fibres; power cables; transformer cores; transformer windings; trigger circuits; 120 kV; 23 A; EUPEC IGBT modulator; MDS; METGLAS 2605 SC cores; Pierce electron gun; fiber optic trigger system; high voltage cable; insulated gate bipolar transistors; sheet electron beams; standard pencil beam; step-up transformer cores; Amorphous magnetic materials; Electron beams; Insulated gate bipolar transistors; Oil insulation; Optical fibers; Prototypes; Pulse width modulation; Space vector pulse width modulation; Transformer cores; Wounds;
Conference_Titel :
Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop. Conference Record of the Twenty-Sixth International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-8586-1
DOI :
10.1109/MODSYM.2004.1433566
