马赛克晶体仪器函数对X射线汤姆逊散射诊断的影响
Effects of Mosaic Crystal Instrument Functions on X-ray Thomson Scattering Diagnostics
AI总结：
本文研究马赛克HAPG晶体仪器函数在6.7–8.6 keV范围内的高能不对称展宽，发现忽略该不对称性会导致XRTS诊断高估80 eV CH等离子体温度，强调完整IF对准确推断高能量密度系统性质的重要性。
摘要：
马赛克晶体因其高积分反射率，被广泛应用于用于诊断高能量密度系统的光谱仪中。X射线汤姆逊散射（XRTS）已成为这类系统的强大诊断工具，原则上可通过细致平衡直接获取温度等重要性质。然而，测得的XRTS光谱会被光谱仪仪器函数（IF）展宽，若不仔细考虑IF，就可能误判系统状态。本文详细研究了40 μm和100 μm马赛克HAPG晶体的IF，以及展宽在6.7–8.6 keV能量范围内如何随光谱仪位置变化。值得注意的是，我们发现IF形状在高能方向存在强烈不对称性。作为示例，我们考察了IF的不对称性对模拟的80 eV CH等离子体通过XRTS推断温度的影响，发现若使用近似对称的IF，温度可能被高估。因此，我们预期，对完整IF的细致考虑将对通过XRTS在正向建模和无模型方法中推断系统性质产生重要影响。
英文摘要：
Mosaic crystals, with their high integrated reflectivities, are widely-employed in spectrometers used to diagnose high energy density systems. X-ray Thomson scattering (XRTS) has emerged as a powerful diagnostic tool of these systems, providing in principle direct access to important properties such as the temperature via detailed balance. However, the measured XRTS spectrum is broadened by the spectrometer instrument function (IF), and without careful consideration of the IF one risks misdiagnosing system conditions. Here, we consider in detail the IF of 40 $μ$m and 100 $μ$m mosaic HAPG crystals, and how the broadening varies across the spectrometer in an energy range of 6.7-8.6 keV. Notably, we find a strong asymmetry in the shape of the IF towards higher energies. As an example, we consider the effect of the asymmetry in the IF on the temperature inferred via XRTS for simulated 80 eV CH plasmas, and find that the temperature can be overestimated if an approximate symmetric IF is used. We therefore expect a detailed consideration of the full IF will have an important impact on system properties inferred via XRTS in both forward modelling and model-free approaches.
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