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Summary form only given, as follows. Summary form only given. A high voltage static induction thyristor (SI Thy) has significant features, one of which is that carriers can be quickly pulled out of gate region without applying a high voltage to the gate. This feature makes the SI Thy especially suitable for a switch of high rep-rate inductive-energy-storage pulsed power modulators, since the switch can interrupt a current rapidly. In this research, a high rep-rate inductive-energy storage pulsed power modulator, which uses a high voltage SI Thy as an opening switch, has been designed and constructed for application to an induction synchrotron. The target operating frequency of the modulator is 1 Mpps. The induction synchrotron accelerates bunched charged particle beams using induced electric fields, which is proportional to the time derivative of magnetic flux in a toroidal core. In order to prevent a magnetic flux of the core from saturating, it is necessary to reset the toroidal core after each acceleration pulse. Therefore, a reset circuit independent of an acceleration circuit is needed in general. However, the proposed modulator can supply both the acceleration and the reset pulses without any additional circuit and is especially suitable for an induction synchrotron accelerator. We have succeeded in producing an acceleration pulse and a successive reset pulse. When the voltage of an acceleration pulse is about 170 V with a pulse width of 900ns, the obtained reset pulse has a peak voltage of 1.4 kV with pulse width of 124 ns. From a calculation of energy loss in SI Thy, it is expected to operate the modulator at a rep-rate of 200 kpps or more.