HXMT机载X射线偏振仪
X-ray polarimetry on-board HXMT
摘要：
微像素气体探测器的发展，能够图像的光电子在气体中产生的轨道，使得有可能执行偏振的X射线天体源的掠入射X射线望远镜的焦点。HXMT是中国航天局利用Phoswich探测器直接解调技术探测硬X射线天空的一项任务。由于HXMT的一小部分时间将用于专门指向特定的源，它可以在适当的额外资源下拥有一对X射线望远镜，每个望远镜在焦平面上都有一个光电X射线偏振计（EXP 2，高效X射线光电偏振计）。我们提出的望远镜和焦平面仪器的设计，并讨论了这种仪器的性能来检测的程度和角度的线偏振的一些代表性的来源。尽管资源有限，拟议的仪器可以代表X射线偏振测量的突破。
英文摘要：
The development of micropixel gas detectors, capable to image tracks produced in a gas by photoelectrons, makes possible to perform polarimetry of X-ray celestial sources in the focus of grazing incidence X-ray telescopes. HXMT is a mission by the Chinese Space Agency aimed to survey the Hard X-ray Sky with Phoswich detectors, by exploitation of the direct demodulation technique. Since a fraction of the HXMT time will be spent on dedicated pointing of particular sources, it could host, with moderate additional resources a pair of X-ray telescopes, each with a photoelectric X-ray polarimeter (EXP2, Efficient X-ray Photoelectric Polarimeter) in the focal plane. We present the design of the telescopes and the focal plane instrumentation and discuss the performance of this instrument to detect the degree and angle of linear polarization of some representative sources. Notwithstanding the limited resources, the proposed instrument can represent a breakthrough in X-ray Polarimetry.
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