内壳层固体密度Mg X射线Laser碰撞效应的模拟
Simulations of Collisional Effects in an Inner-Shell Solid-Density Mg X-Ray Laser
摘要：
内壳层$α$ X射线激光器是利用自由电子激光器（FEL）的强X射线输出泵浦气体、固体和液体靶而产生的。对于气体靶，激光依赖于K壳层核孔的产生，与通过俄歇衰变填充相比，其时间尺度短。在固体和液体密度系统的情况下，碰撞效应也将是重要的，不仅影响人口，而且线宽，这两者都影响整体增益的程度，及其持续时间。然而，到目前为止，这种碰撞效应还没有得到广泛的研究。我们在这里提出的初始模拟使用CCFLY代码的内壳层激光固体密度镁，在那里我们自洽处理的影响，传入的自由电子激光辐射和原子动力学的镁系统，包括辐射，俄歇，碰撞效应。我们发现，激光跃迁的较低状态的碰撞布居和线的加宽的组合排除了所有的激光，但K $α$的初始冷系统。即使假设瞬时打开的自由电子激光泵，我们发现在固体系统中的增益的持续时间是亚飞秒。
英文摘要：
Inner-shell K$α$ x-ray lasers have been created by pumping gaseous, solid, and liquid targets with the intense x-ray output of free-electron-lasers (FELs). For gaseous targets lasing relies on the creation of K-shell core-holes on a time-scale short compared with filling via Auger decay. In the case of solid and liquid density systems, collisional effects will also be important, affecting not only populations, but also line-widths, both of which impact the degree of overall gain, and its duration. However, to date such collisional effects have not been extensively studied. We present here initial simulations using the CCFLY code of inner-shell lasing in solid density Mg, where we self-consistently treat the effects of the incoming FEL radiation and the atomic kinetics of the Mg system, including radiative, Auger, and collisional effects. We find that the combination of collisional population of the lower states of the lasing transitions and broadening of the lines precludes lasing on all but the K$α$ of the initially cold system. Even assuming instantaneous turning on of the FEL pump, we find the duration of the gain in the solid system to be sub-femtosecond.
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