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Exhaust of turbulence cloud at the tongue shaped deformation event

K. Ida, T. Kobayashi, T. Tokuzawa, T. Akiyama, H. Tanaka, M. Yoshinuma, K. Itoh, The LHD Experiment Group2018年被引用 2Nuclear FusionIF 3出版社

Exhaust of turbulence cloud at the tongue-shaped deformation which triggers MHD bursts is observed in the Large Helical Device in the low density plasma with significant contribution of trapped particles injected by perpendicular neutral beam injection. The exhaust of turbulence cloud is characterized by the abrupt large increase of turbulence amplitude in the frequency range of 150–500 kHz measured with Doppler reflectometer at the edge region of the plasma (). The increase of turbulence amplitude is significantly large and is by one order of magnitude. This abrupt increase of turbulence level is transient and disappears within one milli-second (typically  ∼600 μs). In contrast, the turbulence level slightly inside the plasma edge () decreases by a factor of 2 after the MHD bursts.

日本語訳

MHDバーストを引き起こす舌状変形における乱流雲の排出が、垂直中性粒子ビーム入射によって注入された捕捉粒子の有意な寄与を伴う低密度プラズマ中の大型ヘリカル装置において観測された。乱流雲の排出は、プラズマの周辺領域()においてドップラー反射計で測定された150–500 kHzの周波数範囲における乱流振幅の急激な大きな増加によって特徴づけられる。乱流振幅の増加は著しく大きく、一桁に及ぶ。この乱流レベルの急激な増加は一時的であり、1ミリ秒(典型的には∼600 μs)以内に消滅する。対照的に、プラズマ端よりわずかに内側()の乱流レベルは、MHDバースト後に2分の1に減少する。

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