Recombination of open- f -shell tungsten ions
Recombination of open- f -shell tungsten ions
复制标题
开 F 壳钨离子的重组
DOI：
10.1088/1361-6455/aa547d
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Krantz C
中科院分区：
文献类型：
--
作者：
Krantz C
我们回顾了实验和理论的努力，旨在详细了解电子与高电荷的钨离子的复合，其特征在于一个开放的4f子壳层。高电荷态钨在类似ITER的托卡马克实验中作为等离子体污染物出现，在那里它作为不需要的冷却剂。在等离子体中的电荷态种群的建模需要可靠的热速率系数的电荷变化的电子碰撞。具有开放4f子壳层的中等电荷钨物种的电子复合特别具有挑战性，难以可靠地计算。已经进行了多环实验，在高能量分辨率和良好理解的系统学产生的复合速率系数。显着的偏差相比，简化，但普遍的，计算模型已被发现。一类新的从头算数值计算已经开发，提供了可靠的预测这些离子的总等离子体复合速率系数。
We review experimental and theoretical efforts aimed at a detailed understanding of the recombination of electrons with highly charged tungsten ions characterised by an open 4f sub-shell. Highly charged tungsten occurs as a plasma contaminant in ITER-like tokamak experiments, where it acts as an unwanted cooling agent. Modelling of the charge state populations in a plasma requires reliable thermal rate coefficients for charge-changing electron collisions. The electron recombination of medium-charged tungsten species with open 4f sub-shells is especially challenging to compute reliably. Storage-ring experiments have been conducted that yielded recombination rate coefficients at high energy resolution and well-understood systematics. Significant deviations compared to simplified, but prevalent, computational models have been found. A new class of ab initio numerical calculations has been developed that provides reliable predictions of the total plasma recombination rate coefficients for these ions.