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Methods for reducing singly reflected rays on the Wolter-I focusing mirrors of the FOXSI rocket experiment

机译:减少FOXSI火箭实验的Wolter-I聚焦镜上的单反射射线的方法

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摘要

In high energy solar astrophysics, imaging hard X-rays by direct focusing offers higher dynamic range and greater sensitivity compared to past techniques that used indirect imaging. The Focusing Optics X-ray Solar Imager (FOXSI) is a sounding rocket payload that uses seven sets of nested Wolter-Ⅰ figured mirrors together with seven high-sensitivity semiconductor detectors to observe the Sun in hard X-rays through direct focusing. The FOXSI rocket has successfully flown twice and is funded to fly a third time in summer 2018. The Wolter-Ⅰ geometry consists of two consecutive mirrors, one paraboloid and one hyperboloid, that reflect photons at grazing angles. Correctly focused X-rays reflect once per mirror segment. For extended sources, like the Sun, off-axis photons at certain incident angles can reflect on only one mirror and still reach the focal plane, generating a background pattern of singly reflected rays (i.e., ghost rays) that can limit the sensitivity of the observation to faint, focused sources. Understanding and mitigating the impact of the singly reflected rays on the FOXSI optical modules will maximize the instruments' sensitivity to background-limited sources. We present an analysis of the FOXSI singly reflected rays based on ray-tracing simulations and laboratory measurements, as well as the effectiveness of different physical strategies to reduce them.
机译:在高能太阳天体物理学中,与过去使用间接成像的技术相比,通过直接聚焦成像硬X射线可提供更高的动态范围和更高的灵敏度。聚焦光学X射线太阳成像仪(FOXSI)是探空火箭的有效载荷,它使用七套嵌套的Wolter-Ⅰ型数字镜和七个高灵敏度半导体探测器通过直接聚焦在硬X射线中观察太阳。 FOXSI火箭已经成功飞行了两次,并获资助在2018年夏季进行第三次飞行。Wolter-Ⅰ几何结构由两个连续的镜(一个抛物面和一个双曲面)组成,它们在掠射角上反射光子。正确聚焦的X射线在每个镜段反射一次。对于像太阳这样的扩展光源,轴外光子在某些入射角下只能在一个反射镜上反射,并且仍会到达焦平面,从而生成单反射光线(即幻影光线)的背景图案,从而限制了光束的灵敏度。观察到模糊,集中的信息来源。了解并减轻单反射射线对FOXSI光学模块的影响,将使仪器对背景受限光源的灵敏度最大化。我们根据光线追踪模拟和实验室测量结果对FOXSI单反射光线进行了分析,并提出了不同物理策略来减少它们的效果。

著录项

  • 来源
    《Optics for EUV, x-ray, and gamma-ray astronomy VIII》|2017年|103990J.1-103990J.15|共15页
  • 会议地点 San Diego(US)
  • 作者单位

    University of California Berkeley, Space Sciences Laboratory, 7 Gauss way, Berkeley, USA,CA 94720;

    NASA Marshall Space Flight Center, Space Science Office, ZP12, Huntsville, USA, AL 35812;

    University of Minnesota, School of Physics and Astronomy, 116 Church St. SE, Minneapolis,USA, MN 55455;

    NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, USA, MD 20771;

    NASA Marshall Space Flight Center, Space Science Office, ZP12, Huntsville, USA, AL 35812;

    University of California Berkeley, Space Sciences Laboratory, 7 Gauss way, Berkeley, USA,CA 94720;

    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;

    National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;

    University of California Berkeley, Space Sciences Laboratory, 7 Gauss way, Berkeley, USA,CA 94720;

    University of Minnesota, School of Physics and Astronomy, 116 Church St. SE, Minneapolis,USA, MN 55455;

    University of Minnesota, School of Physics and Astronomy, 116 Church St. SE, Minneapolis,USA, MN 55455;

    University of Minnesota, School of Physics and Astronomy, 116 Church St. SE, Minneapolis,USA, MN 55455;

    University of California Berkeley, Space Sciences Laboratory, 7 Gauss way, Berkeley, USA,CA 94720,University of Applied Sciences Northwestern Switzerland, Windisch, Switzerland;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    FOXSI; X-ray telescope; solar; Wolter-Ⅰ optics;

    机译:福克斯X射线望远镜;太阳Wolter-Ⅰ光学;

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