Effects of the gas puffing neutral on the plasma parameters in the end-cell of GAMMA10/PDX by using the multi-fluid code “LINDA”
Effects of the gas puffing neutral on the plasma parameters in the end-cell of GAMMA10/PDX by using the multi-fluid code “LINDA”
复制标题
使用多流体代码“LINDA”观察气体吹入中性对 GAMMA10/PDX 末端单元中等离子体参数的影响
DOI：
10.1016/j.nme.2018.12.027
复制
发表时间：
2019
影响因子：
2.6
通讯作者：
M.Sakamoto
中科院分区：
文献类型：
--
作者：
M.S.Islam;Y.Nakashima;S. Takechi;R.Tatsumi;A.Hatayama;T.Iijima;S.Yamashita;T.Yoshimoto;T.Hara;N.Ezumi;M.Sakamoto
本研究以数值模拟方式探讨了等离子体在伽马10/PDX中的流动行为。利用多流体程序琳达，数值研究了向偏滤器区注入杂质气体对等离子体参数和能量损失过程的影响。中性粒子被注入到体氢等离子体中，z轴上的上游等离子体参数为ni = 1.0× 10 19 m− 3，Ti = 100 eV，Te = 30 eV。随着中性氢注入量的增加，等离子体温度降低。电离和电荷交换（CX）功率损耗随H中性密度的增加几乎呈线性增加，导致等离子体温度降低。在氢注入过程中，同时注入Ar和Ne，观察Ar和Ne对电子和离子能量损失机制的影响。在本研究中，杂质密度与上游等离子体密度的比值（nz/ni）被用作10%。比较了Ar和Ne对电子的冷却作用，结果表明Ar对电子的冷却是有效的。发现Ar的辐射功率损失高于Ne。辐射冷却效应和CX损失分别显著降低电子和离子温度。观察到Ar和Ne种子对离子能量损失项的轻微影响。注入杂质气体Ar和Ne时，电子能量损失项显著增加。这些结果代表了用于减少偏滤器靶板上的等离子体能量的气体播种的影响。
This research numerically investigates the behavior of plasma flow in GAMMA 10/PDX. The impact of impurity gases seeding into the divertor region on the plasma parameters and the energy loss processes has been investigated numerically by using the multi-fluid code “LINDA”. The neutral particles are injected into the bulk hydrogen plasma and the upstream plasma parameters on the z-axis are n i= 1.0× 10 19 m− 3, T i= 100 eV, T e= 30 eV. A reduction in the plasma temperature has been observed with the increasing H neutral injection. The ionization and Charge-exchange (CX) power loss increase almost linearly with the increasing H neutral density, which induce a reduction in the plasma temperature. During H seeding, Ar and Ne are seeded simultaneously to observe the influence of Ar and Ne on the electron and ion energy loss mechanism. In this study, the fraction of impurity density to upstream plasma density (n z/n i) is used to be 10%. A comparison between Ar and Ne shows that Ar is effective on the electron cooling. The radiation power loss of Ar is found to be higher than that of Ne. The radiation cooling effect and CX loss significantly reduces the electron and ion temperature, respectively. A slight influence of Ar and Ne seeding on the ion energy loss terms has been observed. The electron energy loss terms increase significantly during impurity gas Ar and Ne seeding. These outcomes represent the impact of gas seeding for reducing the plasma energy on the divertor target plates.