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Oscillation of 1MW at quad-frequency 203GHz, 170 GHz, 137GHz and 104GHz were demonstrated with a high-order mode (TE31,11) gyrotron developed for ITER. The final design of the ITER equatorial launcher has being implemented. The RF prototype testing to validate the millimeter wave design of the launcher were carried out and the results confirmed the steering range and quality of mm-wave beam and in-directly...
Quad-frequency oscillation from 100 GHz to 200 GHz was demonstrated using ITER gyrotron at QST. Those RF beam passed through the center of the gyrotron window and good couples to transmission line were obtained for each oscillation. The mega-watt-class power was obtained for all frequencies. Validation of gyrotron for a demo reactor is numerically started on the basis of our multi-frequency gyrotron.
A mode conversion miter-bend with angle controllable mirror was developed. By changing mirror angle, RF beam angle in the miter bend is controlled and transmission mode contents (LP01 and LP11 modes) are controlled. The miter bend was tested at 170 GHz mW-class low power RF system. The dependence of miter bend mirror angle and ratio of LP01 and LP11 modes was acquired. The concept of mode conversion...
The mode conversion by thermal deformation of the transmission line (TL) for electron cyclotron heating and current drive (EC H&CD) system caused by high-power long-pulse operation was studied. Mode contents in 40m length TL test stand were measured and compared for before and after the 600 kW / 169 s long-pulse operation. The mode content indicated that HE11 mode decreased by 10 % and LP11 mode...
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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