Observation of Axial Neutral-Gas Flow Reversal in an ECR Plasma
Observation of Axial Neutral-Gas Flow Reversal in an ECR Plasma
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DOI：
10.1585/pfr.14.1201066
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发表时间：
2019-03-22
影响因子：
0.8
通讯作者：
Tanaka, Masayoshi Y.
中科院分区：
文献类型：
--
作者：
Abe, Emika;Terasaka, Kenichiro;Tanaka, Masayoshi Y.
对部分电离圆柱等离子体中轴向中性气体输运进行了实验研究。采用高精度激光诱导荧光光谱测量离子和中性粒子的绝对流动速度，并通过改变充气压力测量了与平行于磁场的质量传输相关的轴向流动速度。研究发现，中性气体流动在空间上是不均匀的，轴向流动在一定条件下会发生逆转。实验结果表明，中性气体流场的不均匀是等离子体-中性气体耦合的结果，轴向中性输运在等离子体结构的形成中起着重要作用。(C)2019年日本等离子体科学与核聚变研究学会
Axial neutral gas transport has been experimentally investigated in a partially ionized cylindrical plasma. The high-accuracy laser induced fluorescence spectroscopy is embraced to evaluate the absolute flow velocity of ions and neutral particles, and the axial flow velocity associated with the mass transport parallel to the magnetic field has been measured by changing the filling gas pressure. It has been found that the neutral gas flow is spatially non-uniform, and the axial flow reversal takes place under a certain circumstance. The experimental results indicate that non-uniformity of neutral gas flow field is generated as a consequence of the plasma-neutral coupling and the axial neutral transport plays an important role in the plasma structure formation. (C) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research