An ECRH/ECCD system with two 68GHz/500kW/lS gyrotrons will be built up in HL-BA tokamak. The location of the Gaussian beam waist is 580 mm away from the center of the plasmas and the beam radius is 37 mm at the center of the plasmas. Compared to the minor plasma radius (420 mm), it is small enough for localized control. The launcher system covers a wide toroidal and poloidal steering range by the two steering plane mirrors. Therefore it is possible to explore the onand off-axis heating over half of the plasma minor cross section and the co-current drive.
Theoretical calculation and experimental results for a polarizer with sinusoidal grooves used in the electron cyclotron resonance heating (ECRH) system of the HL-2A tokamak are presented. The calculation is based on an integral method developed in the vector theory of diffraction gratings, and the polarization characteristics obtained with a low-power test are in good agreement with the numerical calculated results. With the polarizer assembled in a miter bend in the ECRH transmission line, pure ordinary mode (O-mode) and extraordinary mode (X-mode) polarized waves are also expected in the high-power experiment, depending on the polarizer rotation angle and the toroidal injection angle of the electron cyclotron (EC) wave beam. Second-harmonic X-mode experiments were successfully explored in HL-2A. Experimental result revealed that the electron temperature increased from 0.8 keV (Ohmic heating phase) to 1.5 keV (second X-mode heating phase).
Power measurement is necessary for an electron cyclotron resonance heating (ECRH) system. The dummy load is one of the significant equipment for the millimeter wave power measurement. In this paper, The dummy load is analyzed based on the quasi-optical method and the ray tracing method. The reflectivity and thermal deposition of the dummy load has been considered to ensure the safety of the whole system. High-power tests have been carried out at a 105 GHz/500 kW ECRH system. The results of the tests indicate that the dummy load is stable and valid.
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