[IEEE Conference Record of the Twenty-Sixth International Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop. - San Francisco, California, USA (May 23-26, 2004)] Conference Record of the Twenty-Sixth International Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop. - Development of a pspice circuit model for the rimfire 6 MV gas switch using 2-D electrostatic simulations