Partial and total dielectronic recombination rate coefficients for W55+ to W38+
Partial and total dielectronic recombination rate coefficients for W55+ to W38+
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DOI：
10.1088/1361-6455/aa6a3c
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
S. Preval;N. Badnell;M. O’Mullane
中科院分区：
文献类型：
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作者：
S. Preval;N. Badnell;M. O’Mullane
双电子复合（DR）是磁约束聚变等离子体中W中低电荷态离子的主要复合方式。完整的，最终状态解决的部分iscrystal W DR速率系数数据是需要详细的碰撞辐射建模等离子体在准备即将到来的聚变实验ITER。为了实现这一要求，我们继续钨项目，提出我们的计算钨离子W 55 +到W 38 +。根据我们之前对W 73 +到W 56 +的计算，我们使用碰撞包自结构来计算中间耦合（IC）和组态平均（CA）中所有相关核心激发的部分和总DR速率系数，使用κ平均相对论波函数。辐射复合率系数也计算用于评估电离分数的目的。与其他作者的DR率系数比较，在峰丰度处的一致性在7%~ 19%之间，验证了我们方法的可靠性。比较IC和CA计算的部分DR速率系数在峰值丰度温度下的差异因子为102，突出了相对论构型混合的重要性。使用我们的复合速率系数数据计算的电离分数与Pütterich等人（2008 Plasma Phys. Control. Fusion 50 085016）。这些差异归因于前者用于计算其数据的平均原子方法的缺陷。
Dielectronic recombination (DR) is the dominant mode of recombination in magnetically confined fusion plasmas for intermediate to low-charged ions of W. Complete, final-state resolved partial isonuclear W DR rate coefficient data is required for detailed collisional-radiative modelling for such plasmas in preparation for the upcoming fusion experiment ITER. To realise this requirement, we continue The Tungsten Project by presenting our calculations for tungsten ions W 55 + to W 38 + . As per our prior calculations for W 73 + to W 56 + , we use the collision package autostructure to calculate partial and total DR rate coefficients for all relevant core-excitations in intermediate coupling (IC) and configuration average (CA) using κ-averaged relativistic wavefunctions. Radiative recombination rate coefficients are also calculated for the purpose of evaluating ionisation fractions. Comparison of our DR rate coefficients for W 46 + with other authors yields agreement to within 7%–19% at peak abundance verifying the reliability of our method. Comparison of partial DR rate coefficients calculated in IC and CA yield differences of a factor ∼ 2 at peak abundance temperature, highlighting the importance of relativistic configuration mixing. Large differences are observed between ionisation fractions calculated using our recombination rate coefficient data and that of Pütterich et al (2008 Plasma Phys. Control. Fusion 50 085016). These differences are attributed to deficiencies in the average-atom method used by the former to calculate their data.