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Surface finish quality of the outer AXAF mirror pair based on x ray measurements of the VETA-I

机译:基于VETA-I的X射线测量结果,外部AXAF反射镜对的表面光洁度质量

摘要

We employ the X-ray measurements of the VETA-I taken at the X-Ray Calibration Facility (XRCF) of the Marshall Space Flight Center (MSFC) to extract information about the surface finish quality of the outermost pair of AXAF mirrors. The particular measurements we consider are one dimensional scans of the core of the point response function (PRF) (full width half maximum (FWHM) scans), the encircled energy as a function of radius, and one dimensional scans of the wings of the PRF. We discuss briefly our ray trace model which incorporates the numerous effects present in the VETA-I test, such as the finite source distance, the size and shape of the X-ray source, the residual gravitational distortions of the optic, the despace of the VETA-I, and particulate contamination. We show how the data constrain the amplitude of mirror surface deviations for spatial frequencies greater than about 0.1 mm(exp -1). Constraints on the average amplitude of circumferential slope errors are derived as well.
机译:我们采用在马歇尔太空飞行中心(MSFC)的X射线校准设施(XRCF)上进行的VETA-I的X射线测量,以提取有关最外面的一对AXAF反射镜的表面光洁度的信息。我们考虑的特定测量是点响应函数(PRF)核心的一维扫描(全宽半最大值(FWHM)扫描),作为半径函数的环绕能量以及PRF机翼的一维扫描。我们简要讨论了光线跟踪模型,该模型结合了VETA-I测试中存在的多种影响,例如有限的光源距离,X射线源的大小和形状,光学元件的残余重力畸变, VETA-I和微粒污染。我们展示了数据如何限制大于约0.1 mm(exp -1)的空间频率的镜面偏差的幅度。还推导了对周向斜率误差的平均幅度的约束。

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