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Current diffusive interchange mode turbulence at low magnetic shear

Kimitaka Itoh, Masatoshi Yagi, Sanae-I Itoh, Atsushi Fukuyama1997年Plasma Physics and Controlled FusionIF 2.2出版社

Turbulent transport of a heliotron/torsatron is investigated near the radius where the pitch of the magnetic field line is minimum or maximum. The current diffusive interchange mode turbulence is analysed. The curvature of the pitch of the magnetic field line dictates the level of the turbulence and the turbulent transport. The enhanced turbulence and the suppression of the pressure gradient are shown to occur in the vicinity of the radius where the magnetic shear vanishes. The dependence of the nonlinear decorrelation rate of the turbulence on the pressure gradient is found to be independent of the magnitude of the shear, ( being the normalized pressure gradient multiplied by the gradient of the magnetic field).

日本語訳

ヘリオトロン/トーサトロンにおける乱流輸送を、磁力線のピッチが最小または最大となる半径付近で調べた。電流拡散型交換モード乱流を解析した。磁力線のピッチの曲率が、乱流および乱流輸送のレベルを決定することが示された。圧力勾配の増強と抑制が、磁気シアが消失する半径付近で生じることが示された。圧力勾配に対する非線形デコリレーション率の依存性は、磁気シアの大きさに依存しないことが見出された(ここで、\(\hat{\eta}\) は規格化された圧力勾配と磁場勾配の積である)。

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