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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...
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