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`Profile consistency' features in shaped sawtoothing ohmic TCV plasmas

H Weisen, R Behn, I Furno, J-M Moret, O Sauter, the TCV team1998年Plasma Physics and Controlled FusionIF 2.2出版社

A large variety of plasma conditions has been created in TCV (Tokamak à Configuration Variable, m, a < 0.25 m). They include limited and diverted discharges with elongations in the range 1-2.58, triangularities between -0.7 and 1 as well as `square' shapes with plasma currents in the range 0.1-1 MA. Over the entire range of quasi-stationary ohmic conditions investigated we observe a correlation between electron pressure profiles and conductivity profiles, suggesting that , where refers to an average over the volume or respectively, the cross sectional area of the plasma. The profiles become broader as the average current density is increased. These `profile consistency' features are in apparent agreement with theoretical considerations based on minimum energy states of the plasma or on stationary entropy. Further analysis of the experimental evidence, together with a model of the current profile consistent with neoclassical conductivity in the confinement zone and corresponding to a safety factor inside the sawtoothing core, however, shows that the observations can be accounted for by the effects of sawtooth activity.

日本語訳

TCV(可変配位トカマク、 m、a < 0.25 m)において、多種多様なプラズマ条件が生成された。これには、伸長度1〜2.58、三角形度-0.7〜1、および「角型」形状を有するリミター配位およびダイバータ配位の放電が含まれ、プラズマ電流は0.1〜1 MAの範囲である。調査された準定常オーミック条件の全範囲にわたり、電子圧力分布と電気伝導度分布の間に相関が観察され、 ここで は体積平均、またはそれぞれプラズマ断面積の平均を指す。平均電流密度が増加するにつれて、分布はよりブロードになる。これらの「分布の自己無撞着性」の特徴は、プラズマの最小エネルギー状態または定常エントロピーに基づく理論的考察と明らかに一致する。しかしながら、実験的証拠のさらなる解析と、閉じ込め領域における新古典電気伝導度と整合し、かつ内部キンク領域内の安全係数 に対応する電流分布モデルを組み合わせることで、これらの観測結果はサートゥース活動の効果によって説明できることが示される。

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TCVOhmic heating
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