Abstract

The electron induced processes on tungsten (W) and related materials are of prime importance for the fusion plasma application purposes. W and tungsten based materials have been recommended as the plasma facing components such as walls and divertors in the current fusion devices. We report electron impact total ionization cross sections (TICS) for the W atoms. We also report the direct ionization cross sections for the 4f, 5d, 5p and 6s sub shells of the ground state W. The ionization cross sections have been calculated in the variants of distorted wave approximation (DWA) using Hartree-Fock wavefunctions and distorted potential. We have also calculated ionization cross sections in simpler modified Kim and modified Khare models with scaling laws. Present TICS results have been compared with the other available theoretical results. Reasonable agreement with the existing theoretical results have been obtained for the TICS of W atoms by present distorted wave and BEB approaches. The majority of contribution to the total ionization cross section comes from the direct ionization of 6s and 5d subshells.

Graphic abstract

中文翻译：

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聚变等离子体相关材料的电子诱导电离截面的计算：W原子

摘要

钨（W）和相关材料上的电子感应过程对于聚变等离子体应用目的至关重要。在当前的聚变设备中，已推荐使用钨和钨基材料作为面向等离子体的组件，例如壁和分流器。我们报告了W原子的电子碰撞总电离截面（TICS）。我们还报告了基态W的4f，5d，5p和6s子壳的直接电离横截面。已使用Hartree-Fock波函数和畸变电势在畸变波近似（DWA）变体中计算了电离横截面。我们还用更简单的修改后的Kim模型和修改后的Khare模型（具有缩放定律）计算了电离截面。目前的TICS结果已与其他可用的理论结果进行了比较。利用现有的畸变波和BEB方法，已经获得了与W原子的TICS理论值相符的理论结果。对总电离截面的大部分贡献来自6s和5d子壳的直接电离。

图形摘要