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Proceedings Paper

Development of balloonborne hard x-ray telescopes using a multilayer supermirror
Author(s): Keisuke Tamura; Koujun Yamashita; Hideyo Kunieda; Yuzuru Tawara; Akihiro Furuzawa; Kazutoshi Haga; Gyanendra S. Lodha; Norio Nakajo; Norihiko Nakamura; Takashi Okajima; Osamu Tsuda; Peter J. Serlemitsos; Jack Tueller; Robert Petre; Yasushi Ogasaka; Yang Soong; Kai-Wing Chan
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Paper Abstract

We present new results in the development of high throughput hard x-ray telescopes with multilayer supermirror coatings. Basic techniques to make the supermirror are at first developed in deposition of constant d spacing multilayers. The reflector of multilayer on the float glass achieves high reflectivity, limited by the surface roughness of substrate, while, we need more improvement in getting comparable reflectivity of multilayers on the replica foil. We put the mask just in front of sample, it reduced the nonuniformity of the thickness less than 2%. In order to maximize the effective area and field of view, we have optimized the supermirror parameters; d spacing, number of layer pairs, and thickness ratio of heavy and light element. Multiblock method is introduced to design the supermirror, and it gives high reflectivity of approximately 30% in the 25 - 40 keV band. A test supermirror sputtered on a glass sample exhibits reasonable reflectivities of about 20 - 30%. We designed a telescope system with 45 cm diameter, 20 cm mirror length in two stage, and focal length of 8 m. The effective area of four such telescopes is 320 cm2 for the x rays between 25 and 40 keV. We plan the application of this type of telescope to the balloon experiment named InFOC(mu) S to reveal hard x-ray images of clusters of galaxies or supernova remnants.

Paper Details

Date Published: 11 July 1997
PDF: 8 pages
Proc. SPIE 3113, Grazing Incidence and Multilayer X-Ray Optical Systems, (11 July 1997); doi: 10.1117/12.278858
Show Author Affiliations
Keisuke Tamura, Nagoya Univ. (Japan)
Koujun Yamashita, Nagoya Univ. (Japan)
Hideyo Kunieda, Nagoya Univ. (Japan)
Yuzuru Tawara, Nagoya Univ. (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Kazutoshi Haga, Nagoya Univ. (Japan)
Gyanendra S. Lodha, Nagoya Univ. (India)
Norio Nakajo, Nagoya Univ. (Japan)
Norihiko Nakamura, Nagoya Univ. (Japan)
Takashi Okajima, Nagoya Univ. (United States)
Osamu Tsuda, Nagoya Univ. (Japan)
Peter J. Serlemitsos, NASA Goddard Space Flight Ctr. (United States)
Jack Tueller, NASA Goddard Space Flight Ctr. (United States)
Robert Petre, NASA Goddard Space Flight Ctr. (United States)
Yasushi Ogasaka, NASA Goddard Space Flight Ctr. (Japan)
Yang Soong, NASA Goddard Space Flight Ctr. (United States)
Kai-Wing Chan, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 3113:
Grazing Incidence and Multilayer X-Ray Optical Systems
Richard B. Hoover; Arthur B. C. Walker, Editor(s)

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