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首页> 外文期刊>Plasma physics and controlled fusion >Interplay between parallel and perpendicular sheared flows and fluctuations in the plasma boundary region of the TJ-II stellarator
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Interplay between parallel and perpendicular sheared flows and fluctuations in the plasma boundary region of the TJ-II stellarator

机译：TJ-II恒星切割机的平行和垂直剪切流之间的相互作用以及等离子体边界区域的波动

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摘要

Radial profiles of the poloidal velocity of fluctuations and parallel flows have been simultaneously investigated in the proximity of the last closed flux surface in the TJ-II stellarator. It has been observed that sheared perpendicular and parallel flows are linked. The parallel flow is affected by the degree of instability in the plasma edge and its radial gradient is near the threshold of Kelvin-Helmholtz instabilities. Furthermore, parallel flows and edge instabilities are dynamically coupled. These results show that, at least partially, parallel flows are controlled by plasma turbulence. Plasma profiles, parallel flows and fluctuations have also been investigated in the proximity of low order rational surfaces in the plasma boundary region. Evidence of quasi-coherent modes and a modification in the level of fluctuations have been observed near the 4/2 rational surface located in the plasma boundary region. Parallel flows show differences in configurations with and without low order rationals: a minimum appears at the outer side of the rational location, whereas in the configurations free of rationals, this minimum disappears. Plasma edge biasing is an effective tool to induce changes in parallel and perpendicular flows.
机译：在TJ-II恒星器中最后一个封闭的通量表面附近，同时研究了波动和平行流的极向速度的径向分布。已经观察到，剪切的垂直流和平行流是联系在一起的。平行流受等离子体边缘不稳定程度的影响，其径向梯度接近开尔文-亥姆霍兹不稳定性的阈值。此外，并行流和边缘不稳定性是动态耦合的。这些结果表明，至少部分地，平行流受到等离子体湍流的控制。还研究了等离子体边界区域中低阶有理表面附近的等离子体轮廓，平行流动和波动。在位于等离子边界区域的4/2有理表面附近，已经观察到准相干模态和波动水平的变化。并行流显示有无低阶有理数的配置中的差异：最小值出现在有理位置的外侧，而在无理数的配置中，此最小值消失了。等离子边缘偏置是引起平行流和垂直流变化的有效工具。

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