Hobbs L M R, Brant S, Brent K, Hoarty D, Bentley C
AWE Plc, Aldermaston, Reading RG4 7PR, United Kingdom.
Rev Sci Instrum. 2020 Mar 1;91(3):033107. doi: 10.1063/1.5139706.
Over the past few years, work has been conducted at AWE to accurately characterize x-ray diffraction crystals to allow for absolute measurements of x-ray emission for our Orion opacity campaigns. Diffraction crystals are used in spectrometers on Orion to record the dispersed spectral features emitted by the laser produced plasma to obtain a measurement of the plasma conditions. Previously, based on a Manson x-ray source, our calibration system struggled to attain a high signal at the low energies required in calibration for the use of aluminum as a tracer for higher atomic number experiments. Here, we present data from the newly commissioned CTX400 x-ray source, a twin anode water cooled system, showing it to be a bright source even for ∼1 keV energies. Rocking curve measurements for three of the most commonly used crystals, namely, pentaerythritol, cesium acid phthalate, and germanium, are presented for both convex and flat forms.
在过去几年中，原子武器研究机构开展了相关工作，以精确表征X射线衍射晶体，从而在我们的猎户座不透明度实验中实现对X射线发射的绝对测量。衍射晶体用于猎户座光谱仪中，记录激光产生的等离子体发射的分散光谱特征，以获得等离子体条件的测量值。此前，基于曼森X射线源，我们的校准系统在以铝作为更高原子序数实验的示踪剂进行校准时所需的低能量下，难以获得高信号。在此，我们展示了新投入使用的CTX400 X射线源（一种双阳极水冷系统）的数据，表明即使在约1千电子伏特能量下，它也是一个明亮的光源。给出了三种最常用晶体（即季戊四醇、邻苯二甲酸氢铯和锗）凸面和平板形式的摇摆曲线测量结果。
