Shibata R, Ishida M, Kunieda H, Endo T, Honda H, Misaki K, Ishida J, Imamura K, Hidaka Y, Maeda M, Tawara Y, Ogasaka Y, Furuzawa A, Watanabe M, Terashima Y, Yoshioka T, Okajima T, Yamashita K, Serlemitsos P J, Soong Y, Chan K W
Appl Opt. 2001 Aug 1;40(22):3762-83. doi: 10.1364/ao.40.003762.
X-ray characterization measurements of the x-ray telescope (XRT) onboard the Astro-E satellite were carried out at the Institute of Space and Astronautical Science (Japan) x-ray beam facility by means of a raster scan with a narrow x-ray pencil beam. The on-axis half-power diameter (HPD) was evaluated to be 1.8?-2.2?, irrespective of the x-ray energy. The on-axis effective areas of the XRTs for x-ray imaging spectrometers (XISs) were approximately 440, 320, 240, and 170 cm(2) at energies of 1.49, 4.51, 8.04, and 9.44 keV, respectively. Those of the x-ray spectrometer (XRS) were larger by 5-10%. The replication method introduced for reflector production significantly improved the imaging capability of the Advanced Satellite for Cosmology and Astrophyics (ASCA) XRT, whose HPD is ~3.6?. The increase in the effective area by a factor of 1.5-2.5, depending upon the x-ray energy, compared with that of the ASCA, was brought about by mechanical scale up and longer focal lengths. The off-axis HPDs were almost the same as those obtained on the optical axis. The field of view is defined as the off-axis angle at which the effective area becomes half of the on-axis value. The diameter of the field of view was ~19? at 1.49 keV, decreasing with increasing x-ray energy, and became ~13? at 9.44 keV. The intensity of stray light and the distribution of this kind of light on the focal plane were measured at the large off-axis angles 30? and 60?. In the entire XIS field of view (25.4 mm x 25.4 mm), the intensity of the stray light caused by a pointlike x-ray source became at most 1% of the same pointlike source that was on the optical axis.
利用窄X射线笔形束光栅扫描，在日本宇宙航空科学研究所的X射线束设施中对“朱雀”卫星搭载的X射线望远镜（XRT）进行了X射线特性测量。无论X射线能量如何，轴上半功率直径（HPD）评估为1.8″-2.2″。对于X射线成像光谱仪（XIS）的XRT，在1.49、4.51、8.04和9.44 keV能量下的轴上有效面积分别约为440、320、240和170 cm²。X射线光谱仪（XRS）的有效面积大5%-10%。引入的反射器制造复制方法显著提高了宇宙和天体物理学高级卫星（ASCA）XRT的成像能力，其HPD约为3.6″。与ASCA相比，有效面积根据X射线能量增加了1.5-2.5倍，这是通过机械放大和更长的焦距实现的。离轴HPD与在光轴上获得的几乎相同。视场定义为有效面积变为轴上值一半时的离轴角。在1.49 keV时视场直径约为19″，随X射线能量增加而减小，在9.44 keV时变为约13″。在30°和60°的大离轴角下测量了杂散光强度及其在焦平面上的分布。在整个XIS视场（25.4 mm×25.4 mm）中，点状X射线源产生的杂散光强度最多为光轴上同一点状源的1%。
