Reduction of turbulent transport with zonal flows enhanced in helical systems.
Reduction of turbulent transport with zonal flows enhanced in helical systems.
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DOI：
10.1103/physrevlett.100.195002
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发表时间：
2008-05
影响因子：
8.6
通讯作者：
Tomo-Hiko Watanabe;H. Sugama;S. FERRANDO-MARGALET
中科院分区：
文献类型：
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作者：
Tomo-Hiko Watanabe;H. Sugama;S. FERRANDO-MARGALET
为了研究螺旋磁构型对离子温度梯度湍流输运和纬向流动的影响，对离子温度梯度湍流进行了陀螺动力学Vlasov模拟。得到的结果证实了理论预测，即为减少新古典纹波输运而优化的螺旋构型可以在增强纬向流产生的同时减少湍流输运。通过对新经典优化螺旋几何的模拟，可以清楚地识别出伴随输运减少的静止带流结构。固定纬向流的产生解释了在大螺旋装置中观察到的内移等离子体约束改善的物理机制[j]。Motojima,诊断。核聚变学报，2003,17(6):559 - 567。
Gyrokinetic Vlasov simulations of the ion temperature gradient turbulence are performed in order to investigate effects of helical magnetic configurations on turbulent transport and zonal flows. The obtained results confirm the theoretical prediction that helical configurations optimized for reducing neoclassical ripple transport can simultaneously reduce the turbulent transport with enhancing zonal-flow generation. Stationary zonal-flow structures accompanied with transport reduction are clearly identified by the simulation for the neoclassically optimized helical geometry. The generation of the stationary zonal flow explains a physical mechanism for causing the confinement improvement observed in the inward-shifted plasma in the Large Helical Device [O. Motojima, Nucl. Fusion 43, 1674 (2003)].