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Gyrokinetic simulation of zonal flows and ion temperature gradient turbulence in helical systems

T.-H. Watanabe, H. Sugama, S. Ferrando-Margalet2007年被引用 49Nuclear FusionIF 3出版社

The gyrokinetic-Vlasov simulation code (GKV code) is applied to zonal flows and the ion temperature gradient (ITG) turbulence in helical systems with L = 2 and M = 10 like the Large Helical Device (where L and M denote poloidal and toroidal periodicities of the main helical component of the confinement field, respectively) for the standard and inward-shifted model configurations. Because of the slower radial drift motion of helical-ripple-trapped particles, the inward-shifted case provides a higher zonal-flow response than that in the standard model with smaller side-band helical field components. The nonlinear GKV simulations show that the ITG turbulent transport in the inward-shifted model, which has larger growth rates of the ITG stability, is regulated by the zonal flows to a level comparable to the standard case.

日本語訳

ジャイロ運動論的ブラゾフシミュレーションコード(GKVコード)を、Large Helical DeviceのようなL=2、M=10のヘリカルシステム(ここでLとMは閉じ込め磁場の主ヘリカル成分のポロイダルおよびトロイダル周期数をそれぞれ表す)における帯状流とイオン温度勾配(ITG)乱流に適用し、標準配位と内向きシフト配位の両方について調べた。ヘリカルリップル捕捉粒子の径方向ドリフト運動が遅いため、内向きシフト配位の方が、より小さなサイドバンドヘリカル磁場成分を持つ標準配位よりも高い帯状流応答を示す。非線形GKVシミュレーションにより、ITG安定性の成長率が大きい内向きシフト配位におけるITG乱流輸送は、帯状流によって標準配位と同等のレベルに抑制されることが示された。

装置

lhd中精度(概要文一致)

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GyrokineticZonal flowIon temperature gradientHelical systemTemperature gradient turbulence
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