重元素高电荷态离子内壳层激发共振复合过程是研究超强电磁场条件下基础物理的极好载体；重元素离子共振复合强度系数也是聚变等离子体研究所亟需的重要原子物理参数。本项目充分利用电子束离子阱装置对离子电荷态的可控性，通过依次增加重元素离子L壳层电子数的方法，系统地研究离子与电子碰撞产生的内壳层激发双电子复合过程，以此研究多电子效应对碰撞强度、离子能级结构的影响。研究结果将为多体动力学理论的完善提供系统的实验数据，检验描写原子体系的基础理论在极端强场下的适用性。同时，本项目研究内容的选择，也针对聚变等离子体研究的需求，提供关键原子参数，例如其中对钨的研究，包含对应如ITER堆运行时芯部等离子体温度下的主要钨离子电荷态，其共振截面数据有助于建模研究ITER芯部等离子体热辐射效应。

Inner-shell electron excitation resonant recombination process in highly charged heavy ion is of vital for fundamental physics in extremely strong electromagnetic field. The resonant recombination strength is also needed for fusion plasma research. In this project, we are going to make systematic studies of electron ion collisions of heavy ions with different number of L-electrons, using the excellent charge state adjusting ability of the electron beam ion trap. We are going to study the resonant strengths, resonant energies and stabilization photon spectra of dielectronic recombinations. The results will provide systematic experimental data for testing and improving many body theory, and for testing the atomic theory in extremely strong electromagnetic field. The studies in this project will also provide accurate atomic data for fusion plasma modelling. For instance, the selected tungsten charge states covers the main range in core plasma of ITER. The results from this study will be useful for the modelling of radiation cooling of ITER core plasma.