New design concept of supermirror for hard x-ray telescope

Keisuke Tamura; Hideo Kitou; Koujun Yamashita; Yuzuru Tawara; Yasushi Ogasaka; Takashi Okajima; Satoshi Ichimaru; Arifumi Gotou; Ken'ichi Nomoto

doi:10.1117/12.448488

14 November 2001 New design concept of supermirror for hard x-ray telescope

Keisuke Tamura, Hideo Kitou, Koujun Yamashita, Yuzuru Tawara, Yasushi Ogasaka, Takashi Okajima, Satoshi Ichimaru, Arifumi Gotou, Ken'ichi Nomoto

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Proceedings Volume 4501, X-Ray Mirrors, Crystals, and Multilayers; (2001) https://doi.org/10.1117/12.448488
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

We studied about new design of supermirror and inerfacial roughness for the X-ray telescope above 40 keV. We have developed hard X-ray telescope above 10 keV using platinum-carbon multilayer supermirror. In our balloon borne experiment, named InFOC(mu) S launched in this June, the supermirror expand the upper-limit of energy band of X-ray telescope up to 40 keV. We are trying to improve supermirror design to have energy band up to 70 keV. In previous design, the absorption of upper layers and lower-limit of layer thickness prevent us to extend the energy band. In this paper, we optimize design parameters of supermirror and use second Bragg peak, and we obtained high reflectivity up to 70 keV. We studied about interfacial roughness of platinum-carbon multilayer to design the supermirror, because the interfacial roughness is very serious problem such high energy region. In many cases, simple Debye-Waller factor can't represent measured reflectivity. We introduced two different roughness for Pt/C and C/Pt interfaces. This model well fit the data and make us possible to design the supermirrors.

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Keisuke Tamura, Hideo Kitou, Koujun Yamashita, Yuzuru Tawara, Yasushi Ogasaka, Takashi Okajima, Satoshi Ichimaru, Arifumi Gotou, and Ken'ichi Nomoto "New design concept of supermirror for hard x-ray telescope", Proc. SPIE 4501, X-Ray Mirrors, Crystals, and Multilayers, (14 November 2001); https://doi.org/10.1117/12.448488

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KEYWORDS

Reflectivity

X-ray telescopes

Optical instrument design

X-rays

Hard x-rays

Data modeling

Telescopes

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