11 October 2004 Evaluation of an ultra-high-precision x-ray optics
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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.
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Shunji Kitamoto, Norimasa Yamamoto, Takayoshi Kohmura, Kazuharu Suga, Hiroyuki Sekiguchi, Youhei Ohkawa, Junichi Kanai, Shigeto Chiba, Junichi Sato, Keisuke Sudo, Takeshi Watanabe, "Evaluation of an ultra-high-precision x-ray optics", Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.550364; https://doi.org/10.1117/12.550364
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