Observation of molecular assisted recombination via negative ions formation in a divertor plasma simulator, TPDSHEET-IV
Observation of molecular assisted recombination via negative ions formation in a divertor plasma simulator, TPDSHEET-IV
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在偏滤器等离子体模拟器 TPDSHEET-IV 中通过负离子形成观察分子辅助重组
DOI：
10.1016/s0022-3115(02)01535-0
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发表时间：
2003
影响因子：
3.1
通讯作者：
K. Takayama
中科院分区：
文献类型：
--
作者：
A. Tonegawa;M. Ono;Yasushi Morihira;H. Ogawa;T. Shibuya;K. Kawamura;K. Takayama
在线性等离子体模拟器中观察到负离子形成的分子辅助重组（MAR）。少量氢气被吹入氢等离子体中，极大地降低了目标的热流密度，并迅速增加了等离子体周长氢原子负离子nH−的密度，而传统的辐射和三体复合过程则消失了。nH−定位于有电子存在的外区（ne ~ 5×1017m−3,Te=3 - 5 eV）。nH−的峰值为1.2×1017m−3，外区nH−/ ne2的比值高达20%以上。这些结果可以通过考虑分离等离子体中MAR的负离子和正离子之间的相互中和来很好地解释。
Molecular assisted recombination (MAR) via negative ions formation has been observed in a linear plasma simulator. A small amount of hydrogen gas puffed into a hydrogen plasma strongly reduced the heat flux to the target and rapidly increased the density of negative ions of hydrogen atom, nH−, in the circumference of the plasma, while the conventional radiative and three-body recombination processes disappeared. nH−is localized in the outer region where electrons exist (ne∼5×1017m−3, Te=3–5 eV). The peak value of nH−is 1.2×1017m−3and the ratio of nH−/nein the outer region goes up to over 20%. These results can be well explained by taking the mutual neutralization between the negative and positive ions of MAR in the detached plasma into account.