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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...
In JAEA, mode conversion in the corrugated waveguide system which is the same inner diameter of the ITER waveguide transmission line was studied. The mode contents at the input and end of the straight section of TL were measured and the mode conversion loss caused by the straight section which composed from several pieces of straight waveguides was discussed. The method to minimize the mode conversion...
The high power gyrotron and the power coupling efficiency with the corrugated waveguide are discussed. The 170 GHz transmission lines(TLs) for electron cyclotron heating and current drive (EC H&CD) system in the International Thermonuclear Experimental Reactor (ITER) require higher purity of HEιι mode to minimize a transmission loss. In addition, higher order modes will generate a stray RF in...
The ITER Electron Cyclotron Heating and Current Drive (ECH&CD) transmission line components will need to be suitable for 1-2 MW CW operation. The high heat loads compared to existing transmission lines will require enhanced cooling and, for some components, new or modified designs. Testing at representative ITER conditions of key components has been carried out at the JAEA 170 GHz gyrotron test...
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...
The performance requirement of 1 (possibly 2) MW cw at 170 GHz for ITER Electron Cyclotron Heating and Current Drive transmission line components is much more demanding than the performance that has been demonstrated on present devices. The high ITER heat loads will require enhanced cooling and, for some components, new or modified designs. In addition to thermal management issues, the components...
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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