Research Project code：0250002109
Update date：Feb. 12, 2003
Research on X-ray optical system using parallel X-ray source of Space Research Institute
2000 - 2000
The Space Research Institute has been engaged in the evaluation of characteristics of various X-ray optical systems such as X-ray telescope for satellite use. In the fiscal 2000, the evaluation was focused on the characteristic of a directly incident inverted telescope that is designed in conformity with carbon K emission line (44 angstrom). The telescope employs the Cassegrain system composed of a main spherical mirror of 20 cm diameter and a sub-mirror of calibrated aspherical type. By putting its focus on an X-ray generator, we can set up a wide parallel X-ray radiation source. The parallelism was found sufficient as expected, but scattering at the mirror plane was found intense. Irradiation to the actual telescope showed that the obtained center of the focused image was sharp and reflected the image core of the telescope very well, but in the outer area of the mirror more than three arc minute, large tailing by scattering was observed. If the evaluation is limited to the measurement at the core of the focused image, the telescope is sufficiently practical. The major target of the measurement in the fiscal 2000 is the test on characteristics of a hard X-ray telescope for use in a balloon experiment (InFOC micro-S Plan, reported in P. 38, by Tahara (Nagoya Univ.)). This optical system has the same diameter as that of the X-ray telescope for use in "ASTRO-E", with 8 m focal length. The measurement of the telescope characteristics with the currently used system for 4.5 m to 4.75 m focal length needs to adopt a system of slower movement of the detector than that of the telescope.
Ministry with control over the research ：
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Ministry of Education, Culture, Sports, Science and Technology