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Determination of local transport coefficients by heat flux analysis and comparisons with theoretical models

B Balet, J G Cordey, P M Stubberfield1992年Plasma Physics and Controlled FusionIF 2.2出版社

The energy confinement properties of different regimes of JET plasmas are investigated. The results of local transport analysis in both L- and H-mode regimes are discussed and the properties of H-mode plasmas produced by neutral beam injection and/or ion cyclotron resonance heating are compared. Two aspects of transport analysis are addressed. Firstly, the relative importance of the electron and ion heat conductivities and a comparison with the effective particle diffusivity since this determines the nature of the turbulence responsible for the degradation in confinement. The second issue is whether theoretical models adequately describe the radial dependence of the measured heat flux. Several theoretical models are considered: the ion temperature gradient driven turbulence model, the Rebut-Lallia critical temperature gradient model, the dissipative and collisionless trapped electron drift wave mode, the Carreras-Diamond resistive ballooning model and the neoclassical pressure gradient driven turbulence model.

日本語訳

JETプラズマの異なる領域におけるエネルギー閉じ込め特性を調査する。LモードおよびHモード領域の両方における局所輸送解析の結果を議論し、中性粒子ビーム入射および/またはイオンサイクロトロン共鳴加熱によって生成されたHモードプラズマの特性を比較する。輸送解析の2つの側面が扱われる。第一に、電子およびイオンの熱伝導率の相対的重要性と、有効粒子拡散率との比較である。これは、閉じ込めの劣化の原因となる乱流の性質を決定するためである。第二の問題は、理論モデルが測定された熱流束の動径依存性を適切に記述するかどうかである。いくつかの理論モデルが考慮される:イオン温度勾配駆動乱流モデル、Rebut-Lallia臨界温度勾配モデル、散逸性および無衝突捕捉電子ドリフト波モード、Carreras-Diamond抵抗性バルーニングモデル、および新古典圧力勾配駆動乱流モデル。

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