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Theoretical calculation and experimental results for a polarizer with sinusoidalgrooves used in the electron cyclotron resonance heating (ECRH) system of the HL-2A tokamakare presented. The calculation is based on an integral method developed in the vector theoryof diffraction gratings, and the polarization characteristics obtained with a low-power test are ingood agreement with the numerical calculated results. With the polarizer assembled in a miterbend 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 polarizerrotation 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 resultrevealed that the electron temperature increased from 0.8 keV (Ohmic heating phase) to 1.5 keV(second X-mode heating phase).
Theoretical calculation and experimental results for a polarizer with sinusoidal particles used in the electron cyclotron resonance heating (ECRH) system of the HL-2A tokamakare presented. The calculation is based on an integral method developed in the vector theory of diffraction gratings, with a low-power test are ingood agreement with the numerical calculated results. With the polarizer assembled in a miterbend 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 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 wasvealed that the electron temperature increased from 0.8 keV (Ohmic heating phase) to 1.5 keV (second X-mode heating phase).