1.2 megawatt, 800 MHz rf generator for lower hybrid resonance heating

This paper describes an RF heating system capable of providing an RF power output of 1.2 Megawatts at 800 MHz for the PLT machine. The RF generating system utilizes six Varian VA-955 UHF, TV Klystrons operating in parallel to generate the output power. Pulse widths can be varied from 1 millisecond to 500 milliseconds by means of six modulator/regulators which utilize Eimac 4CX35000 Tetrodes as the switch tubes. Detailed circuit description of the various major component parts of one of the six RF channels are provided along with some of the major design considerations