Laser-plasma x-ray sources have garnered interest from various communities due to their ability to generate high photon-energies from a small source size. The passive imaging of high energy x-rays and neutrons is also a useful diagnostic in laser-driven fusion capsules as well as laboratory astrophysics experiments which aim to study small samples of transient electron-positron plasmas. Here we study a coded aperture with scatter and partial attenuation included, which we call a ‘CASPA’, and compare them to the more common method of pinhole imaging. As well as discussing the well-known increased throughput of coded apertures, we also show that the decoding algorithm relaxes the need for a thick substrate. We simulate a 511 keV x-ray source through ray-tracing and Geant4 simulations to show how incomplete attenuation of the source by the mask may be less detrimental to imaging using a CASPA than to using a standard pinhole system.

中文翻译：

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带散射和部分衰减的编码光圈，用于高能高分辨率成像

激光等离子体X射线源因能够从较小的源尺寸产生高光子能量而引起了各个社区的关注。高能X射线和中子的被动成像在激光驱动的聚变胶囊以及旨在研究瞬态电子-正电子等离子体的小样本的实验室天体物理学实验中，也是一种有用的诊断方法。在这里，我们研究了包含散射和部分衰减的编码孔径，我们将其称为“ CASPA”，并将其与更常见的针孔成像方法进行比较。除了讨论众所周知的编码孔径增加的吞吐量外，我们还显示了解码算法可以放松对厚基板的需求。