高电荷态Ar离子K壳层高阶双电子伴线研究

Dielectronic satellite is crucial in high energy density and astrophysical physics. Specially, the neglect of high order dielectronic satellite of the trace element (usually argon) will mislead the temperature and density diagnostics in the inertial confusion fusion (ICF) experiment. However, there are few experimental studies on high order dielectronic satellite of argon, which embarrass the diagnostic accuracy severely. The goal of this work is to study the high-order dielectronic satellite of H- and He-like argon ions channel-specifically. The experiments will be carried out on Electron Beam Ion Trap (EBIT) facility. The electron beam energy will be optimized to create the interested doubly excited state. A crystal spectrometer with high resolution and a Ge detector will be applied to record the experimental spectrum. Dielectronic-resonance strengths will be measured relative to the cross section for non-resonant radiative electron capture. The experimental results of the high-n satellite lines will be used to compare with the theoretical calculations and to investigate their contributions to the relevant parent lines. This work will be of great benefit to the accuracy of the plasma diagnostics and the development of the related research fields.

双电子伴线在高能量密度和天体物理等离子体状态研究中扮演着重要的角色，尤其是在惯性约束聚变等离子体精密诊断中，Ar离子高阶双电子伴线会同时改变共振线的形状和强度，忽略这些伴线将会严重影响电子温度和密度的诊断精度。然而，诊断模型中通常只考虑了低阶(n=2,3)双电子伴线的贡献，对高阶伴线及其对共振线影响的细致研究工作非常少，这严重制约了诊断精密化水平的提高。本项目拟在电子束离子阱(EBIT)装置上，通过细致优化和精确控制电子束能量，采用高分辨光谱测量技术，开展类He和类H Ar离子K壳层高阶双电子伴线的细致研究，获取不同跃迁通道双电子伴线光谱实验数据和谱线位置、共振强度等相关原子参数信息，校验理论模型，研究高阶双电子伴线对共振线强度和谱线形状的影响。本研究将有助于进一步推进等离子体状态诊断的精密化，在高能量密度和天体物理等领域得到广泛的应用。

在高能量密度和天体物理等离子体中，示踪元素X射线光谱是诊断电子温度与密度的重要方法。双电子伴线在该诊断中扮演着重要的角色，Ar离子高阶双电子伴线会同时改变共振线的形状和强度，忽略这些伴线将会严重影响诊断精度。然而，在惯性约束聚变中，诊断模型中通常只考虑了低阶(n=2,3)双电子伴线的贡献，对高阶伴线细致研究工作非常少，这严重制约了诊断精密化水平的提高。本项目在电子束离子阱(EBIT)装置上，开展类Heb线的高阶双电子伴线（KMn，n=2-5）的实验研究，获取双电子伴线实验数据，并提取出共振强度等原子参数，为校验理论模型、提高诊断精度提供了实验依据。本研究将有助于进一步推进等离子体状态诊断的精密化，促进高能量密度和天体物理有等领域的发展。