Plasma screening in mid-charged ions observed by K-shell line emission
M. Šmıd, O. Humphries, C. Baehtz, V. Bouffetier, E. Brambrink, T. Burian, V. Cerantola, M. S. Cho, T. E. Cowan, L. Gaus, M. F. Gu, V. Hájková, L. Juha, J. Kaa, … 展开作者
M. Šmıd, O. Humphries, C. Baehtz, V. Bouffetier, E. Brambrink, T. Burian, V. Cerantola, M. S. Cho, T. E. Cowan, L. Gaus, M. F. Gu, V. Hájková, L. Juha, J. Kaa, Z. Konopkova, H. P. Le, M. Makita, X. Pan, T. Preston, A. Schropp, J. P. Schwinkendorf, H. A. Scott, R. Štefanıková, J. Vorberger, W. Wang, U. Zastrau, K. Falk
Dense plasma environment affects the electronic structure of ions via variations of the microscopic electrical fields, also known as plasma screening. This effect can be either estimated by simplified analytical models, or by computationally expensive and to date unverified numerical calculations. We have experimentally quantified plasma screening from the energy shifts of the bound-bound transitions in matter driven by the x-ray free electron laser (XFEL). This was enabled by identification of detailed electronic configurations of the observed Kα, K\b{eta} and Kγ lines. This work paves the way for improving plasma screening models including connected effects like ionization potential depression and continuum lowering, which will advance the understanding of atomic physics in Warm Dense Matter regime.
Nonlinear polarization effects on plasma screening for fusion reactions
Key Laboratory of Beam Technology of the Ministry of Education, and School of Physics and Astronomy, Beijing Normal University（教育部束流技术重点实验室，北京师范大学物理与天文学院）；Institute of Applied Physics and Computational Mathematics（应用物理与计算数学研究所）；Graduate School, China Academy of Engineering Physics（中国工程物理研究院研究生院）；CAPT, HEDPS, and IFSA Collaborative Innovation Center of MoE, Peking University（北京大学、教育部前沿交叉学科研究中心、高能量密度物理中心和IFSA协同创新中心）；Institute of Radiation Technology, Beijing Academy of Science and Technology（北京市科学技术研究院辐射技术研究所）
Plasma screening and configuration interaction effects induced large enhancement on L-shell photoionization cross sections and opacity
National Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics（计算物理国家重点实验室，应用物理与计算数学研究所）；School of Optoelectronics, University of Chinese Academy of Sciences（中国科学院大学光电学院）；School of Mathematics and Physics, Qinghai University（青海大学理学院）；Center for Applied Physics and Technology, HEDPS, Peking University（北京大学高能量密度物理科学与技术研究院应用物理与技术中心）
该研究提出结合等离子体屏蔽和组态相互作用效应改进处理的不透明度模型，解释了铁、铬和镍不透明度相关差异，为太阳内部温度下 L 壳层不透明度测量提供系统解释，推动高能量密度等离子体中相关精确模拟。
