电子束离子阱与先进光源模拟天体物理过程的理论研究

项目名称： 电子束离子阱与先进光源模拟天体物理过程的理论研究

项目编号： No.11273032

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 梁贵云

作者单位： 中国科学院国家天文台

项目金额： 100万元

中文摘要： 利用高分辨光谱的天体观测数据，天体物理学家加深了对碰撞主导的炽热天体等离子体加热机制的了解（如类星冕、击波加热、Flare加热等），以及致密天体（Vela X-1）吸积盘的环境及吸积物理过程。但模型与观测间的差异使天体物理学家思考这种用于天体高分辨光谱分析模型的可靠性。电子束离子阱基于其独有的特性（等离子体电子密度与天体环境完全相符）成为验证天体光谱分析模型的良好实验平台，并用于模拟炽热等离子体环境揭示天体中的物理过程。地面先进光源（宽能带）的相继投入使用，比如自由电子激光和同步辐射源。为模拟致密天体中的光离化等离子体提供了一种可能性。本项目从理论上，研究高通量的自由电子激光光源辐照电子束离子阱所产生的低密度、低离化等离子体中相关物理问题。比如光离化等离子体时，各离化态离子的演化；获取高质量光谱的实验物理条件；X-射线光谱随各物理参数变化；并与天体和实验观测比较揭示天体环境和物理问题。

中文关键词： 电子束离子阱；先进光源；光谱分析模型与诊断；原子数据库；光电离

英文摘要： By using observation data for astrophysical objects with high spectral-resolution, astrophysicists have a better unsderstanding for the heating mechanism of hot plasmas dominated by collisions than before (for example, stellar conoral-like, shock-wave heating, flare heating and so on), as well as the environment of accretion disk and accreting physics of dense objects (Vela X-1). However, astrophysicists have to consider the reliability of theoretical models used for spectroscopy with high resolution of astorphysical objects because of existing differences between models and observations. Electron beam ion trap is a perfect platform in laboratory for benchmarks of spectroscopic models due to its particular characteristics (generated plasmas with electron densities to be consistent with that in astrophysical cases). Moreover, it is used to simulate hot plasmas to reveal physical processes in astrophysical objects. With the setup and in operation of worldwide advanced light sources (broadband of energy), for example, free-electron laser and synchrotron radiation sources, it is possible to simulate the photoionized plasmas in dense objects. In this work, we will investigate those relavant physics when free-electron laser sources with high brightness irradiating low-dense and low-charged plasmas generated by electro

英文关键词： Electron beam ion trap；Advanced light source；spectroscopic analysis model and diagnostic；Atomic database；Photoionized