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Calculation of the radial electric field with RF sheath boundary conditions in divertor geometry

机译：偏滤器几何中带有RF护套边界条件的径向电场的计算

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摘要

The equilibrium electric field that results from an imposed DC bias potential, such as that driven by a radio frequency (RF) sheath, is calculated using a new minimal two-field model in the BOUT++ framework. Biasing, using an RF-modified sheath boundary condition, is applied to an axisymmetric limiter, and a thermal sheath boundary is applied to the divertor plates. The penetration of the bias potential into the plasma is studied with a minimal self-consistent model that includes the physics of vorticity (charge balance), ion polarization currents, force balance with E × B, ion diamagnetic flow (ion pressure gradient) and parallel electron charge loss to the thermal and biased sheaths. It is found that a positive radial electric field forms in the scrape-off layer and it smoothly connects across the separatrix to the force-balanced radial electric field in the closed flux surface region. The results are in qualitative agreement with the experiments. Plasma convection related to the E × B net flow in front of the limiter is also obtained from the calculation.
机译：由强加的直流偏置电势（例如由射频（RF）护套驱动的直流偏置电势）产生的平衡电场是使用BOUT ++框架中的新最小二场模型计算得出的。使用RF修改的护套边界条件对轴对称限制器进行偏置，并将热护套边界应用于分流器板。用最小的自洽模型研究了偏置电势向等离子体中的渗透，该模型包括涡旋的物理性质（电荷平衡），离子极化电流，E×B的力平衡，离子反磁流（离子压力梯度）和平行电子电荷流失到热护套和偏置护套。发现在刮除层中形成了正的径向电场，并且在封闭的通量表面区域中，横切面平滑地连接到力平衡的径向电场。结果与实验定性一致。还可以通过计算获得与限制器前面的E×B净流量相关的等离子对流。

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  • 来源
    《Nuclear fusion》 |2018年第2期|026027.1-026027.11|共11页
  • 作者

    B. Gui; T.Y. Xia; X. Q. Xu; J.R. Myra; X.T. Xiao;

  • 作者单位

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, People's Republic of China;

    Lawerence Livermore National Lab, Livermore, California 94550, United States of America;

    Lodestar Research Corporation, Boulder, Colorado 80301, United States of America;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    RF sheath boundary; radial electric field; convection cell;

    机译：射频护套边界;径向电场对流室;

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