基于重离子冷却储存环的类铍氩离子电子碰撞电离实验研究

电子碰撞电离是最基本的电子-离子碰撞反应通道之一，主导着等离子体环境中的电离平衡和能级布居。实验上，高精度的电子碰撞电离截面不仅是检验电子-离子碰撞理论模型和计算方法的可靠基准，同时也可以作为等离子体建模、诊断电子温度、解释天文观测光谱的有效输入参数。配备有电子冷却器的重离子冷却储存环是开展高精度电子-离子碰撞反应实验研究的理想平台，电子冷却器不仅可以大幅提高离子束流品质，同时可以精确调制碰撞能量，为获得高精度电子碰撞电离截面提供了保障。本项目拟利用兰州重离子加速器重离子冷却储存环CSRe开展类铍氩离子的电子碰撞电离实验研究，获得高精度的电子碰撞电离截面，为天体物理和聚变科学提供高精度的原子物理数据，同时为检验最新的理论提供可靠的实验基准。本项目的开展将促进原子物理与天体物理和聚变科学等学科之间交叉，通过实验与理论计算的紧密结合，做出有特色的研究工作。

Electron impact ionization (EII) is one of the fundamental electron-ion collision processes, which dominates the ionization balance and level distribution in a plasma. Accurate experimental EII cross sections can serve as a benchmark for the theoretical models and computational methods. In addition, accurate data are also widely required as input parameters in plasma modeling and diagnostic as well as in interpreting the astrophysical observed spectra. Storage ring equipped with an electron cooler can serve as an ideal platform for such kind of electron-ion collision studies. The electron beam can not only be used to improve the ion beam quality through electron cooling, but also can be used as an electron target with tunable energies. This project intends to carry out the electron impact ionization experiment with Be-like Ar ions at the heavy-ion cooler storage ring CSRe, at the Institute of Modern Physics in Lanzhou. The obtained cross sections with high accuracy and high precision can be regarded as reliable atomic data for astrophysics and fusion science. The state-of-the-art atomic codes can also be tested with the measured experimental benchmark. The development of the project will facilitate the interplay between atomic physics and astrophysics as well as the fusion science and the distinctive progress will be made through the close cooperation between the experimental measurement and the theoretical calculations.