Development of a multilayer supermirror for hard x-ray telescopes

Yuzuru Tawara; Koujun Yamashita; Hideyo Kunieda; Keisuke Tamura; Akihiro Furuzawa; Kazutoshi Haga; Norio Nakajo; Takashi Okajima; Harumi Takata; Peter J. Serlemitsos; Jack Tueller; Robert Petre; Yang Soong; Kai-Wing Chan; Gyanendra S. Lodha; Yoshiharu Namba; Jin Yu

doi:10.1117/12.331278

19 November 1998 Development of a multilayer supermirror for hard x-ray telescopes

Yuzuru Tawara, Koujun Yamashita, Hideyo Kunieda, Keisuke Tamura, Akihiro Furuzawa, Kazutoshi Haga, Norio Nakajo, Takashi Okajima, Harumi Takata, Peter J. Serlemitsos, Jack Tueller, Robert Petre, Yang Soong, Kai-Wing Chan, Gyanendra S. Lodha, Yoshiharu Namba, Jin Yu

Author Affiliations +

Proceedings Volume 3444, X-Ray Optics, Instruments, and Missions; (1998) https://doi.org/10.1117/12.331278
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

We present a current status of the development of hard x-ray telescope using Pt/C multilayer supermirror. The telescope system is to be made by combining thin foil replication technology for high throughput mirror and multilayer supermirror coating technology for hard x-ray reflection. After the successful multilayer coating on the replica foil mirror, we made the performance demonstration model of this type of telescope, having 20 replica foil supermirrors, 10 primary and 10 secondary reflectors, with focal length of 4.75 m and radius of 100 mm. Pt/C multilayer supermirror structure was designed and optimized to have high and flat reflectivity for x-ray energy from 25 through 40 keV. After some efforts to avoid heat damage of replica foil mirror during the deposition process of multilayer by DC sputtering system, we could establish the fabrication method of supermirror structure on replica foil mirror. Based on the x-ray measurement, we found that this demonstration model showed the half power diameter of 1.9 arcmin for had x-rays and nearly the same reflectivity and energy band width as expected. In this paper, we present the design of graded multilayer as the supermirror, the fabrication and the performance of this demonstration model.

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Yuzuru Tawara, Koujun Yamashita, Hideyo Kunieda, Keisuke Tamura, Akihiro Furuzawa, Kazutoshi Haga, Norio Nakajo, Takashi Okajima, Harumi Takata, Peter J. Serlemitsos, Jack Tueller, Robert Petre, Yang Soong, Kai-Wing Chan, Gyanendra S. Lodha, Yoshiharu Namba, and Jin Yu "Development of a multilayer supermirror for hard x-ray telescopes", Proc. SPIE 3444, X-Ray Optics, Instruments, and Missions, (19 November 1998); https://doi.org/10.1117/12.331278

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