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Proceedings Paper

Evaluation of an ultra-high-precision x-ray optics
Author(s): Shunji Kitamoto; Norimasa Yamamoto; Takayoshi Kohmura; Kazuharu Suga; Hiroyuki Sekiguchi; Youhei Ohkawa; Junichi Kanai; Shigeto Chiba; Junichi Sato; Keisuke Sudo; Takeshi Watanabe
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Paper Abstract

We are developing an ultra high precision soft X-ray telescope. The design of the telescope is a normal incident one for 13.5nm band using Mo/Si multilayers. Two ideas are introduced. One is the optical measurement system in order to monitor the precision of the optics system. The other is the adaptive optics system with a deformable mirror. Using an X-ray-optical separation filter, we can always monitor the deformation of the optics by optical light. With this information, we can control the deformable mirror to compensate the system distortion as a closed loop system. The telescope system is now integrating and checking by optical light. The shape of the primary mirror is an off-axis paraboloid with a focal length of 2m and an effective diameter of 80mm. This primary mirror was coated by Mo/Si multilayers. The reflectivity of the primary mirror at 13.5nm was ranging from 30 to 50 %. The secondary mirror is a basically flat mirror but actually an deformable mirror with 31 piezo-actuators. The detector is now a wave front sensor (shack-hartmann type). The closed loop control has been performed and factor of 2.4 improvement of the wave front shape has been performed comparing to the un-control case.

Paper Details

Date Published: 11 October 2004
PDF: 8 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.550364
Show Author Affiliations
Shunji Kitamoto, Rikkyo Univ. (Japan)
Norimasa Yamamoto, Rikkyo Univ. (Japan)
Takayoshi Kohmura, Rikkyo Univ. (Japan)
Kogakuin Univ. (Japan)
Kazuharu Suga, Rikkyo Univ. (Japan)
Hiroyuki Sekiguchi, Rikkyo Univ. (Japan)
Youhei Ohkawa, Rikkyo Univ. (Japan)
Junichi Kanai, Rikkyo Univ. (Japan)
Shigeto Chiba, Rikkyo Univ. (Japan)
Junichi Sato, Rikkyo Univ. (Japan)
Keisuke Sudo, Rikkyo Univ. (Japan)
Takeshi Watanabe, Rikkyo Univ. (Japan)

Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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