横向渐变多层膜反射镜在软X射线偏振测量中的应用
The Use of Laterally Graded Multilayer Mirrors for Soft X-ray Polarimetry
摘要：
我们提出了持续发展的横向梯度多层膜反射镜（LGML）的望远镜设计能够测量线性X射线偏振在一个广泛的光谱带。多层涂层镜用作布鲁斯特角的布拉格反射器。通过与光谱仪的色散匹配，可以利用高多层反射率并在整个0.2-0.8 keV频带上实现超过50%的调制因子。在偏振测量束线开发的第二阶段，我们证明了该系统在0.525 keV下提供100%偏振X射线（Marshall等人，2013）。在这里，我们提出的结果，从我们的发展，其中LGML是用于在源和横向操纵，以选择和从各种源阳极的发射线的X射线。然后，光束线将提供在0.15-0.70 keV波段测试偏振计组件的能力。我们还提出了一个亚轨道火箭实验，旨在检测一个活动星系核的偏振水平优于10%的计划。
英文摘要：
We present continued development of laterally graded multilayer mirrors (LGMLs) for a telescope design capable of measuring linear X-ray polarization over a broad spectral band. The multilayer-coated mirrors are used as Bragg reflectors at the Brewster angle. By matching to the dispersion of a spectrometer, one may take advantage of high multilayer reflectivities and achieve modulation factors over 50% over the entire 0.2-0.8 keV band. In Phase II of the polarimetry beam-line development, we demonstrated that the system provides 100% polarized X-rays at 0.525 keV (Marshall et al. 2013). Here, we present results from phase III of our development, where a LGML is used at the source and laterally manipulated in order to select and polarize X-rays from emission lines for a variety of source anodes. The beamline will then provide the capability to test polarimeter components across the 0.15-0.70 keV band. We also present plans for a suborbital rocket experiment designed to detect a polarization level of better than 10% for an active galactic nucleus.
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