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首页> 外文期刊>Plasma physics and controlled fusion >Observation of large-scale coherent structures under strong E × B shear in the torsatron TJ-K
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Observation of large-scale coherent structures under strong E × B shear in the torsatron TJ-K

机译：旋风加速器TJ-K在强E×B剪切作用下的大规模相干结构观察

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摘要

The influence of strongly sheared E × B flows on the spatio-temporal structure of turbulence has been investigated in a toroidally confined plasma. The experiments have been carried out on the low-temperature plasma of the TJ-K torsatron, where the flow shear was induced by core plasma biasing. The spatio-temporal structure of the turbulence has been measured in great detail with multi-probe arrays. It turned out that because of strong shear, the plasma undergoes a transition, where broadband density fluctuations are suppressed and the particle confinement is improved, but large-scale coherent structures become dominant. They have increased correlation lengths and a reduced lifetime. The large-scale structures could be associated with inward transport due to a modification in the cross-phase between density and potential fluctuations.
机译：在环形密闭等离子体中研究了强剪切E×B流动对湍流的时空结构的影响。实验是在TJ-K旋风加速器的低温等离子体上进行的，在该等离子体上，流变剪切是由堆芯等离子体偏置引起的。湍流的时空结构已通过多探头阵列进行了详细测量。结果表明，由于强烈的剪切作用，等离子体经历了转变，从而抑制了宽带密度波动，改善了粒子的束缚，但是大规模的相干结构成为主导。它们增加了相关长度，并缩短了寿命。由于密度和电位波动之间交叉相的改变，大型结构可能与向内运输有关。

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