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Investigation of ITG turbulence in cylinder geometry within a gyrokinetic global PIC simulation: influence of zonal flows and a magnetic well

Stefan Sorge2004年Plasma Physics and Controlled FusionIF 2.2出版社

A gyrokinetic global nonlinear particle-in-cell (PIC) method is applied to calculate ion-temperature-gradient (ITG) driven turbulence and the resulting anomalous heat transport in a θ-pinch. The level of turbulence and transport are strongly decreased by poloidal zonal E × B flows. The radial electric field, Er, leading to these zonal flows is generated by the turbulence. Thus, a magnetic field with a well according to a finite-β equilibrium and leading to a decrease in the linear growth rates of ITG-modes influences the formation of the radial electric field. The gyrokinetic global nonlinear TORB code has been modified to investigate the consequences for the turbulence level.

日本語訳

ジャイロ運動論的グローバル粒子セル(PIC)法を適用して、イオン温度勾配(ITG)駆動乱流とそれに伴う異常熱輸送をθピンチ配位において計算した。乱流と輸送のレベルは、ポロイダル帯状E×B流によって強く減少する。これらの帯状流を生じさせる径方向電場Erは、乱流によって生成される。したがって、有限ベータ平衡に従った磁場の井戸構造は、ITGモードの線形成長率を低下させ、径方向電場の形成に影響を及ぼす。ジャイロ運動論的グローバルTORBコードを改良し、乱流レベルに対するこれらの影響を調べた。

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GyrokineticParticle-in-cellZonal flowIon temperature gradient
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