Numerical analysis of electron cyclotron resonance heating on JT-60U and JFT-2M

To analyse electron cyclotron heating (ECH) in tokamak plasmas, the computational code has been developed using the ray tracing method. The propagation and absorption of electron cyclotron waves are numerically analysed on JT-60U and JFT-2M plasmas. ECH by the extraordinary wave is studied in the frequency range of second harmonic resonance on JFT-2M plasmas. The dependence of the power absorption on plasma parameters, electron density and temperature, is obtained. On JT-60U, the ordinary and extraordinary waves are numerically analysed in the fundamental resonance frequency range. In the case of the ordinary wave heating, it is shown that the location of power deposition can be scanned along a minor radius by controlling the horizontal angle of beam injection. As for the extraordinary wave heating, the down shift of effective cyclotron resonance frequency due the relativistic effect is investigated. In the case of that the electron temperature exceeds about 10keV, the following is cleared: The wave frequency can be sifted down to 80GHz, where the cyclotron resonance frequency is 120GHz at the plasma center, and the heating of central region is possible. (author)