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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.

研究了托卡马克偏滤器偏置对托卡马克偏滤器热流密度的影响。这种非轴对称偏置在刮离层(SOL)和偏滤器等离子体中产生了ExB对流团，并强烈地改变了SOL和偏滤器等离子体的输运。在JFT-2M托卡马克装置上进行了局部偏滤器偏置实验，观测到了局部偏滤器偏置引起的溶胶中等离子体电势的空间变化。用一维偏滤器偏置模型计算了偏置过程中等离子体电势的空间结构，并与实验观测的结果进行了比较。实验测得的等离子体电势分布与理论估算的结果定性地吻合。除了由直流偏滤器偏置形成的ExB对流团的形成外，还在线性偏滤器等离子体模拟器中研究了射频(RF)在射频天线上诱导的护套及其对天线-等离子体耦合的影响。在传统的环形天线中，天线上的射频电压会产生很大的直流负鞘电压，这种直流负鞘加速的高能离子轰击会显着增加天线的热流密度。天线附近的等离子体势受到近射频场和等离子体耦合的强烈影响，天线附近有望形成ExB对流团。关于RF诱导的ExB对流细胞及其对血浆传输的影响的研究正在进行中。