X-ray imaging and adaptive optics system for a 13.5nm telescope

S. Kitamoto; Y. Ohkubo; M. Tsujimoto; T. Ogita; K. Saitoh; M. Morii; K. Sudoh; N. Gotoh; Y. Shishido; T. Shibata; E. Takenaka

doi:10.1117/12.733655

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20 September 2007 X-ray imaging and adaptive optics system for a 13.5nm telescope

S. Kitamoto; Y. Ohkubo; M. Tsujimoto; T. Ogita; K. Saitoh; M. Morii; K. Sudoh; N. Gotoh; Y. Shishido; T. Shibata; E. Takenaka

Author Affiliations +

Proceedings Volume 6688, Optics for EUV, X-Ray, and Gamma-Ray Astronomy III; 668817 (2007) https://doi.org/10.1117/12.733655
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

We are developing a normal incident X-ray telescope with an adaptive optics system in order to achieve an unprecedented high-angular-resolution. The primary mirror with a diameter of 80mm is a spherical shape with a focal length of 2000 mm, which was coated by Mo/Si multilayer. The secondary mirror is a deformable mirror with 55 mm diameter, which was also coated by Mo/Si multilayer. Optical lights from a pin-hole were measured by a wave-front sensor and used as a reference for a correction of the deformable mirror. All the components were installed in a vacuum chamber. A closed loop control with the wave front sensor and the deformable mirror was successfully performed in the telescope and we confirmed the correction of the wave front. The rms-deviation of a performed wave front from a target shape during the control was ~30 nm-rms, whereas it without control was more than ~80 nm-rms. A 13.5 nm X-ray from an electron impact X-ray source was imaged on a backside CCD installed on a focal plane. A mesh made by steel was installed in front of the X-ray source, whose pitch and wire-thickness are 500 micro-m and 50 micro-m. The image of this mesh by optical lights from the X-ray generator is detected by the CCD. The current image quality is ~2.4 arc-sec and this was comparable to a diffraction limit of an optical wave length with our 80mm primary mirror.

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S. Kitamoto, Y. Ohkubo, M. Tsujimoto, T. Ogita, K. Saitoh, M. Morii, K. Sudoh, N. Gotoh, Y. Shishido, T. Shibata, and E. Takenaka "X-ray imaging and adaptive optics system for a 13.5nm telescope", Proc. SPIE 6688, Optics for EUV, X-Ray, and Gamma-Ray Astronomy III, 668817 (20 September 2007); https://doi.org/10.1117/12.733655

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