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首页> 外文期刊>Experimental Astronomy >A soft X-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter
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A soft X-ray beam-splitting multilayer optic for the NASA GEMS Bragg Reflection Polarimeter

机译：用于NASA GEMS布拉格反射偏振仪的软X射线分束多层光学器件

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摘要

A soft X-ray, beam-splitting, multilayer optic has been developed for the Bragg Reflection Polarimeter (BRP) on the NASA Gravity and Extreme Magnetism Small Explorer Mission (GEMS). The optic is designed to reflect 0.5 keV X-rays through a (90^{circ }) angle to the BRP detector, and transmit 2–10 keV X-rays to the primary polarimeter. The transmission requirement prevents the use of a thick substrate, so a 2 μm thick polyimide membrane was used. Atomic force microscopy has shown the membrane to possess high spatial frequency roughness less than 0.2 nm rms, permitting adequate X-ray reflectance. A multilayer thin film was especially developed and deposited via magnetron sputtering with reflectance and transmission properties that satisfy the BRP requirements and with near-zero stress. Reflectance and transmission measurements of BRP prototype elements closely match theoretical predictions, both before and after rigorous environmental testing.
机译：已经为NASA重力和超强磁力小型探索者任务（GEMS）的布拉格反射偏振仪（BRP）开发了软X射线分束多层光学器件。光学器件被设计为以0.5 keV的X射线通过（90°）角反射到BRP检测器，并将2–10 keV的X射线透射到主偏振仪。透射要求阻止了使用厚基板，因此使用了2μm厚的聚酰亚胺膜。原子力显微镜已显示该膜具有小于0.2 nm rms的高空间频率粗糙度，从而具有足够的X射线反射率。特别开发并通过磁控溅射沉积多层薄膜，该薄膜具有满足BRP要求和接近零应力的反射率和透射特性。在严格的环境测试之前和之后，BRP原型元素的反射率和透射率测量值都与理论预测非常吻合。

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