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Recent progress on a high power 170 GHz gyrotron development in JAEA is presented. After the demonstration of ITER basic performance, the gyrotron has been operated for 3 years, and recorded ~200 GJ of total output energy. As a next activity, a study of a CW-power modulation of the gyrotron for NTM (Neo classical Tearing Mode) stabilization has started. Up to now, power modulation of 5 kHz for short...
An injection antenna, so-called launcher, of millimeter wave power to plasma for the ITER (International Thermonuclear Experimental Reactor) has been designed. Two kinds of the ITER launcher, "Equatorial" and "Upper" are required and JAEA has been designing the former and developing its components. The mm-wave transmission section of the equatorial launcher originally consists...
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