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A coupling method of a gyrotron beam into a corrugated waveguide is proposed to achieve high HE11 mode purity in ITER's ECH&CD transmission line. A matching optical unit (MOU) with two phase correcting mirrors is used. Each mirror is mounted on a goniometer stage for angle control. The mode content in the waveguide is measured for several sets of mirror angles to maximize the mode purity. The...
An ITER torus window prototype with CVD diamond disks and corrugated waveguides are being investigated by using IR imaging and temperature measuring technique during high power RF microwave loading up to 1 MW at a frequency of 170 GHz at the JAEA gyrotron facility. To evaluate the cooling efficiency of the window design the temperature distribution over the diamond disk area is measured and compared...
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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