Academic Seminars 2021 No.122 – 柯锐

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时间：2021年12月31日 周五 14:30

方式：腾讯会议（会议号573-668-391）

线下：326会议室

报告人：柯锐   核工业西南物理研究院

论文投稿报告

题目：Electrode biasing maintains the edge shear layer at high density in the J-TEXT tokamak

摘要：Collapse of the edge shear as n→n_G has been observed as a precursor to the enhanced edge particle flux characteristic of the density limit regime. Here, we report the use of a biased electrode to sustain the edge shear layer in high density discharges in which the shear layer would otherwise collapse. A stable increase in both line-averaged and edge density is observed. These experiments were carried out on the J-TEXT tokamak. The Reynolds stress at the edge is enhanced, and the zonal flow sustained, while density perturbation levels, the flux of turbulence internal energy (i.e., turbulence spreading) and particle and heat flux all decrease significantly. These results suggest that external edge E´B shear drive may be of interest for sustaining edge plasma states at high density, and support the hypothesis that collapse of the edge shear layer triggers the onset of the strong transport and turbulence characteristic of the density limit regime.

关键词: density limit, edge shear layer, turbulence, electrode bias

报告人简介：

柯锐，博士，核工业西南物理研究院副研究员。主要从事托卡马克装置边缘湍流输运的物理实验研究，及先进光学诊断技术的研发。研究内容包括，边缘湍流-带状流体系的非线性相互作用，高密度放电条件下的边缘湍流输运，以及基于中性束光谱的边缘湍流诊断技术（BES、FI-FIDA、MI-CXRS等）研发。