双电子复合(DR)过程是一个重要的电子－离子非弹性碰撞过程，精确的DR截面和速率系数是实验室高温等离子体中研究等离子体电离平衡和光谱分析的重要参量。钨由于其优良的物理化学性质而被选作ITER 面向材料。深入研究钨离子的DR过程及光谱性质有助于在磁约束核聚变等离子体中监测和控制钨离子杂质流、优化等离子体性能，也有助于理解复杂结构重离子中的电子关联效应、级联效应。本项目拟利用相对论理论方法，考虑初态能级boltzmann分布，内壳层电子激发，双电子激发态退激发的级联效应，组态相互作用，开展复杂结构钨离子的开4d、4f壳层的双电子复合过程及光谱特性的研究。分析各类效应的贡献，同时寻找可用于参数诊断的禁戒线，并进行DR伴线修正，为聚变等离子体光谱模拟以及温度和密度诊断提供参考。

Dielectronic recombination (DR) is a important atomic pro- cess in electron-ion collisions. Accurate DR cross sections and rate coefficients are essential for studying the ionization balance of highly ionized ions in hot plasmas.Tungsten (W) was chosen for the armor material of plasma facing component of ITER due to its high melting point thermal conductivity, its low tritium retention and erosion rate under plasma loading. Investigations on the DR process and spectrum properties of tungsten are helpful for monitoring and controlling the tungsten impurity influx in the fusion plasma and optimizing the plasma performance. It is also helpful to understand the electron correlation and cascade effects in high Z ions with complex structure.The multiconfiguration Dirac-Fock and relativistic configuration interaction method are used to investigate the initial state level boltzmann distribution, inner-shell electron excitation and cascade effect of doubly excited state for tungsten ions with complex structure. DR process and radiative transition for open 4d/4f shell are investigated. Forbidden transitions are also investigated, it are useful Plasma diagnostics. Furthermore, the accurate atomic data of W ions will be obtained which is helpful for the fusion plasma diagnostics.