Magnetron power modulator for driving a microtron THz FEL

Korea Atomic Energy Research Institute (KAERI) has developed a new modulator using IGBT. The bipolar pulse generator provides preliminary dynamic magnetization of the transformer core. also, bipolar pulse generator makes possible computer control of the starting current of the magnetron. Computer operation with the bipolar pulse generator can produce 34% current change. Corrector for pulse waveform correction has been described. With the corrector we reduced magnetron frequency deviation down to 40kHz. Modulator output parameters: 10Hz 51kV 100A 6us.