Toroidal Electric Field Effect and Non-Linear Effect on Electron Cyclotron Current Drive in the JT-60U

概要

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Recent progress in the development of electron cyclotron heating/current drive systems in regard to power and pulse duration have allowed the extension of two normalized parameters (toroidal electric field E_φ and wave power density p). In the extended regime, the conventional theory requires consideration of a distorted electron distribution function. The first validation of the ECCD theory in the extended regime having large E_φ and p is presented. Linear calculation has a tendency to overestimate the EC driven current, as normalized parameters for E_φ and p increase. While the EC driven current 1_<EC> obtained by a linearized Fokker-Planck calculation (1.1MA) did not agree with the measured EC driven current (0.74±0.06MA), non-linear calculation of the Fokker-Planck equation considering the effect of E_φ (0.76MA) shows close agreement with the experimental result. Calculations show that the decreasing effect of E_φ on 1_<EC> was stronger than the increasing effect of p on 1_<EC> in the experiment.
社団法人プラズマ・核融合学会の論文
2004-06-25