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首页> 外文期刊>Bulletin of the American Physical Society >APS -59th Annual Meeting of the APS Division of Plasma Physics - Event - X-ray Spectropolarimetry of Z-pinch Plasmas with a Single-Crystal Technique
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APS -59th Annual Meeting of the APS Division of Plasma Physics - Event - X-ray Spectropolarimetry of Z-pinch Plasmas with a Single-Crystal Technique

机译：APS-等离子体物理APS部门第59届年会-事件-单晶技术对Z夹层等离子体进行X射线能谱分析

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When directed beams of energetic electrons exist in a plasma the resulting x-rays emitted by the plasma can be partially polarized. This makes plasma x-ray polarization spectroscopy, spectropolarimetry, useful for revealing information about the anisotropy of the electron velocity distribution. X-ray spectropolarimetry has indeed been used for this in both space and laboratory plasmas. X-ray polarization measurements are typically performed employing two crystals, both at a 45extdegree Bragg angle. A single-crystal spectropolarimeter can replace two crystal schemes by utilizing two matching sets of internal planes for polarization-splitting. The polarization-splitting planes diffract the incident x-rays into two directions that are perpendicular to each other and the incident beam as well, so the two sets of diffracted x-rays are linearly polarized perpendicularly to each other. An X-cut quartz crystal with surface along the [11-20] planes and a paired set of [10-10] planes in polarization-splitting orientation is now being used on aluminum z-pinches at the University of Nevada, Reno. Past x-ray polarization measurements have been reserved for point-like sources. Recently a slotted collimating aperture has been used to maintain the required geometry for polarization-splitting enabling the spectropolarimetry of extended sources. The design of a single-crystal x-ray spectropolarimeter and experimental results will be presented.
机译：当等离子体中存在高能电子的定向射束时，由等离子体发射的所得x射线可以部分极化。这使得等离子体X射线极化光谱法，光谱极化法可用于揭示有关电子速度分布各向异性的信息。 X射线光谱极化法确实已在空间和实验室等离子体中用于此目的。 X射线偏振测量通常使用两个晶体，两个晶体的布拉格角均为45extdegree。单晶光谱仪可以通过利用两组匹配的内部平面进行偏振分离来替代两种晶体方案。偏振分离平面将入射的x射线衍射到彼此垂直的两个方向上，并且也使入射光束衍射，因此两组衍射的x射线彼此垂直地线性偏振。内华达大学里诺分校的铝Z形夹上正在使用一种X切割石英晶体，该晶体的表面沿[11-20]平面，成对的[10-10]平面在极化分裂方向上。过去的X射线偏振测量已保留给点状源。最近，开槽的准直孔已用于维持偏振分离所需的几何形状，从而实现扩展光源的光谱偏振法。将介绍单晶X射线光谱仪的设计和实验结果。

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