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Limits of applicability of the quasilinear approximation to the lower hybrid wave-plasma interaction

P Pavlo, L Krlín1999年Plasma Physics and Controlled FusionIF 2.2出版社

The diffusion of electrons in velocity space induced by a spectrum of electrostatic waves is numerically investigated. From the scatter of particles, the diffusion coefficient is calculated and compared with the quasilinear value. A strong disagreement is found at high electric field amplitudes, narrow spectra and short (spatial) lengths of the interaction region, which are however usual in Lower Hybrid Heating and Current Drive experiments in tokamaks. In particular, the (velocity) interaction region becomes significantly broader than the Landau resonance region for electric field amplitudes above .

日本語訳

静電波のスペクトルによって誘起される速度空間における電子の拡散を数値的に調査した。粒子の散乱から拡散係数を計算し、準線形値と比較した。高い電場振幅、狭いスペクトル、および相互作用領域の短い(空間的)長さにおいて強い不一致が見られる。しかし、これらはトカマクにおける低ハイブリッド加熱および電流駆動実験では通常のことである。特に、(速度)相互作用領域は、電場振幅が . を超える場合、ランダウ共鳴領域よりも有意に広くなる。

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