A model of plasma current through a hole of Rogowski probe including sheath effects.
A model of plasma current through a hole of Rogowski probe including sheath effects.
复制标题
通过罗戈夫斯基探针孔的等离子体电流模型，包括鞘层效应。
DOI：
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发表时间：
2016
影响因子：
1.6
通讯作者：
H. Yamazaki
中科院分区：
文献类型：
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作者：
H. Furui;A. Ejiri;Y. Nagashima;Y. Takase;M. Sonehara;N. Tsujii;T. Yamaguchi;T. Shinya;H. Togashi;H. Homma;K. Nakamura;T. Takeuchi;S. Yajima;Y. Yoshida;K. Toida;W. Takahashi;H. Yamazaki
在TST-2欧姆放电中，使用Rogowski探头通过改变局部磁场与Rogowski探头孔方向之间的夹角来测量局部电流。当空穴的方向几乎平行于局部磁场时，角度依赖关系出现一个峰值。得到的峰宽比由探针几何形状得到的理论曲线的宽度要宽。为了解释这种分歧，我们考虑了Rogowski探测器附近的鞘效应。建立了鞘模型，对电子轨道进行了数值计算。计算发现，电子轨道受鞘层电场引起的E×B漂移的影响。这样的轨道导致了角依赖关系中的峰展宽，并且这种依赖关系与实验结果一致。数值研究了展宽与各种等离子体参数的关系，并用简化的解析模型对展宽进行了定性的解释。
In TST-2 Ohmic discharges, local current is measured using a Rogowski probe by changing the angle between the local magnetic field and the direction of the hole of the Rogowski probe. The angular dependence shows a peak when the direction of the hole is almost parallel to the local magnetic field. The obtained width of the peak was broader than that of the theoretical curve expected from the probe geometry. In order to explain this disagreement, we consider the effect of sheath in the vicinity of the Rogowski probe. A sheath model was constructed and electron orbits were numerically calculated. From the calculation, it was found that the electron orbit is affected by E × B drift due to the sheath electric field. Such orbit causes the broadening of the peak in the angular dependence and the dependence agrees with the experimental results. The dependence of the broadening on various plasma parameters was studied numerically and explained qualitatively by a simplified analytical model.