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Generation of Helical SOL Current by on-axisymmetric Divertor Biasing and its effects on SOL Plasma Transport

轴对称偏滤器偏置产生螺旋 SOL 电流及其对 SOL 等离子体输运的影响

基本信息

批准号：
08458133
负责人：
UESUGI Yoshihiko
金额：
$ 0.83万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08458133/
关键词：
divertor biasing non-axisymmetric biasing ExB convective cell heat and particle transport RF induced sheath anttena-plasma coupling anntena heat flux アンテナ熱流局所ダイバータプラズマ SOL・ダイバータバイアスダイバータプラズマダイバータバイアスダイバータ熱負荷コンベクティブセル SOL電流

项目摘要

Heat flux reduction onto the tokamak divertor plate by non-axisymmetric divertor biasing is investigated. ExB convective cells are generated in the scrape off layr (SOL) and divertor plasmas by this non-axisymmetric divertor biasing and SOL and divertor plasma transport is strongly modified. The local divertor biasing experiments have been done in the JFT-2M toka-mak and spatial changes of the plasma potential in the SOL due to local divertor biasing is observed. The spatial structure of the plasma potential during biasing is calculated by 1-DSOL-divertor biasing model and compared with the experimentally observed one. The experimental profile of the plasma potential, which shows the generation of ExB convective cells in the SOL,agrees qualitatively with the theoretical estimation. The particle flux onto the divertor plate is strongly modified by this ExB convective cell formation.In addition to the ExB convective cell formation by DC divertor biasing, Radio Frequency (RF) induced sheath on the RF antenna and its effects on the antenna-plasma coupling are studied in the linear divertor plasma simulator. In the conventional loop antenna large DC negative sheath voltage is induced by RF voltage on the antenna and the antenna heat flux is significantly increased by energetic ion bombardments accelerated by this DC negative sheath. The plasma potential near the antenna is strongly modified by the near RF field and plasma coupling, and the formation of ExB convective cells near the antenna is expected. The study of the RF induced ExB convective cells and their effects on the plasma transport is now in progress.

研究了非轴对称导流器偏置对托卡马克导流板热通量的影响。这种非轴对称偏置在刮脱层（SOL）和导流体中产生ExB对流细胞，强烈地改变了SOL和导流体的输运。在JFT-2M塔卡马克上进行了局部导流器偏置实验，观察到局部导流器偏置引起的SOL等离子体势的空间变化。利用1- dsol -分流器偏置模型计算了偏置过程中等离子体电位的空间结构，并与实验观测结果进行了比较。等离子体电位的实验剖面显示了在SOL中ExB对流细胞的产生，这与理论估计在质量上是一致的。这种ExB对流细胞的形成强烈地改变了转流板上的粒子通量。在线性导流器等离子体模拟器上，研究了直流导流器偏置形成的ExB对流胞，射频诱导鞘层对射频天线的影响及其对天线-等离子体耦合的影响。在传统的环形天线中，射频电压对天线产生较大的直流负护套电压，并通过该直流负护套加速高能离子轰击使天线热流显著增加。天线附近的等离子体电位受到近射频场和等离子体耦合的强烈影响，有望在天线附近形成ExB对流单体。射频诱导的ExB对流细胞及其对等离子体输运影响的研究正在进行中。