Absolute rate coefficients for the recombination of open f-shell tungsten ions

Absolute rate coefficients for the recombination of open f-shell tungsten ions
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开式 f 壳层钨离子重组的绝对速率系数

DOI:
10.1088/1742-6596/488/1/012051
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发表时间:
2014
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
S. Schippers
S. Schippers
中科院分区:
--
文献类型:
--
作者:
C. Krantz;K. Spruck;N. R. Badnell;A. Becker;D. Bernhardt;M. Grieser;M. Hahn;O. Novotný;R. Repnow;D. W. Savin;A. Wolf;A. Müller;S. Schippers

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我们在重离子储存环中直接测量了W 18 ~ W 21 ~+范围内钨的四种电荷态的绝对复合速率系数。我们发现,丰富的原子精细结构的开放f-壳层导致非常高的共振增强的复合率在能量低于~ 50 eV。即使在与聚变等离子体相关的较高能量域中,这也导致复合速率系数比常用的ADAS复合速率数据库预测的高出四倍以上。除了实验测量外,我们还使用Autostructure进行了理论计算。对于W 20+,这些预测的等离子体复合速率系数,同意更好地与测量比ADAS模型,但仍然无法重现详细的实验数据。
We have carried out direct measurements of the absolute recombination rate coefficients of four charge states of tungsten in the range from W 18+ to W 21+ in a heavy ion storage ring. We find that the rich atomic fine structure of the open f-shell leads to very high resonant enhancement of the recombination rate at energies below~ 50 eV. Even in the higher energy domain relevant to fusion plasma this leads to a recombination rate coefficient that is more than four times higher than predicted by the commonly used ADAS database of recombination rates. In addition to the experimental measurements we have carried out theoretical calculations using Autostructure. For W 20+ these predict a plasma recombination rate coefficient that agrees much better with the measurement than the ADAS model but still fail to reproduce the experimental data in detail.
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