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Intensity distribution of the x ray source for the AXAF VETA-I mirror test

机译:AXAF VETA-I反射镜测试的X射线源强度分布

摘要

The X-ray generator for the AXAF VETA-I mirror test is an electron impact X-ray source with various anode materials. The source sizes of different anodes and their intensity distributions were measured with a pinhole camera before the VETA-I test. The pinhole camera consists of a 30 micrometers diameter pinhole for imaging the source and a Microchannel Plate Imaging Detector with 25 micrometers FWHM spatial resolution for detecting and recording the image. The camera has a magnification factor of 8.79, which enables measuring the detailed spatial structure of the source. The spot size, the intensity distribution, and the flux level of each source were measured with different operating parameters. During the VETA-I test, microscope pictures were taken for each used anode immediately after it was brought out of the source chamber. The source sizes and the intensity distribution structures are clearly shown in the pictures. They are compared and agree with the results from the pinhole camera measurements. This paper presents the results of the above measurements. The results show that under operating conditions characteristic of the VETA-I test, all the source sizes have a FWHM of less than 0.45 mm. For a source of this size at 528 meters away, the angular size to VETA is less than 0.17 arcsec which is small compared to the on ground VETA angular resolution (0.5 arcsec, required and 0.22 arcsec, measured). Even so, the results show the intensity distributions of the sources have complicated structures. These results were crucial for the VETA data analysis and for obtaining the on ground and predicted in orbit VETA Point Response Function.
机译:用于AXAF VETA-I镜面测试的X射线发生器是具有各种阳极材料的电子撞击X射线源。在VETA-I测试之前,使用针孔照相机测量了不同阳极的光源尺寸及其强度分布。针孔照相机由直径为30微米的针孔(用于对源成像)和具有25微米FWHM空间分辨率的微通道板成像检测器(用于检测和记录图像)组成。摄像机的放大倍数为8.79,可以测量光源的详细空间结构。使用不同的操作参数测量每个光源的光斑大小,强度分布和通量水平。在VETA-I测试期间,将每个用过的阳极从源室中取出后,立即为其拍摄了显微镜照片。图片中清楚地显示了光源尺寸和强度分布结构。将它们进行比较,并与针孔相机测量的结果一致。本文介绍了上述测量的结果。结果表明,在VETA-I测试所特有的工作条件下,所有光源尺寸的FWHM均小于0.45 mm。对于在528米外的这种大小的源,与VETA的角度大小小于0.17 arcsec,与在地面上的VETA角分辨率(所需的0.5 arcsec和测量的0.22 arcsec)相比较小。即使如此,结果仍表明源的强度分布具有复杂的结构。这些结果对于VETA数据分析以及获得地面和轨道VETA点响应函数中的预测至关重要。

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