Catalytic mechanism of divertor plasma recombination provided by hydrocarbon impurities
Catalytic mechanism of divertor plasma recombination provided by hydrocarbon impurities
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DOI：
10.1063/1.1316082
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发表时间：
2000-10
影响因子：
2.2
通讯作者：
R. Janev;T. Kato;J. G. Wang
中科院分区：
文献类型：
--
作者：
R. Janev;T. Kato;J. G. Wang
结果表明，当碳氢分子CxHy存在于偏滤器等离子体中时，在低于6-8 eV的温度下，它为体积等离子体的复合提供了强有力的催化机制。其机理是基于与CxHy的质子电荷交换和随后的CxHy+与等离子体电子的复合，而其催化性能来自于在每个电荷交换-解离复合循环中同时产生新的碳氢分子Cx‘Hy’。CH4、C2H6和C3H8分子的等离子体复合效率比基于氢分子的类似离子转换-解离复合机理的效率分别高出约10、30和40倍。偏滤器分子气体中2.5%的C3H8对偏滤器等离子体复合的影响与偏滤器中分子氢的全部含量相同。
It is shown that the hydrocarbon molecules CxHy, when present in a divertor plasma, provide a powerful catalytic mechanism for volume plasma recombination at temperatures below 6–8 eV. The mechanism is based on the proton charge exchange with CxHy and the subsequent recombination of CxHy+ with plasma electrons, while its catalytic property derives from the simultaneous creation of new hydrocarbon molecules Cx′Hy′ in each charge exchange–dissociative recombination cycle. The plasma recombining efficiency of CH4, C2H6, and C3H8 molecules is for a factor of about 10, 30, and 40 higher than the efficiency of the similar ion conversion–dissociative recombination mechanism based on the molecule hydrogen. A 2.5% of C3H8 in the divertor molecular gas has the same effect on divertor plasma recombination as the entire content of molecular hydrogen in the divertor.