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Proceedings Paper

Soft x-ray transmission of contamination blocking filter for SXI onboard ASTRO-H
Author(s): Takayoshi Kohmura; Kenta Kaneko; Hiroshi Tsunemi; Kiyoshi Hayashida; Ryo Nagino; Shota Inoue; Daiki Uchida; Shuhei Katada; Tadayasu Dotani; Masanobu Ozaki; Hiroshi Tomida; Masashi Kimura; Takeshi Go Tsuru; Shoma Ikeda; Kazunari Yabe; Kento Miyakawa; Masato Andoh; Shintaro Kuwano; Yuta Sato; Kohki Tamasawa; Shoma Tanno; Yuma Yoshino
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Paper Abstract

X-ray CCD operated onboard satellite are contaminated by outgas from organic material used in satellites. This contamination causes a significant reduction in the detection sensitivity of X-ray detectors. In order to prevent such contamination to the Back-Illuminated CCD (BI-CCD) of the Soft X-ray Imager (SXI) onboard ASTRO-H, we have developed a Contamination Blocking Filter (CBF), which consists of ~30nm thick Aluminum and ~200nm thick Polyimide. The CBF is be placed on the top of the CCD camera hood and is required to have a high X-ray transmission in order to take advantage of the high detection efficiency of BI-CCD. We measured the X-ray transmission of three flight candidates of the CBF last October at the SPring-8 and obtained the X-ray transmission of three CBFs in the soft X-ray energy from 0.2 to 1.8 keV which covers the absorption edges around C-K, N-K, O-K, and Al-K including X-ray absorption fine structure (XAFS). In these measurements, we found three CBFs have high X-ray transmission below 2ke V, e.g. ~70% at around 0.5 keV, and determined the thickness of Al and Polyimide to be 220 nm and ~50 nm, respectively. We will calculate the response function of SXI including these results.

Paper Details

Date Published: 31 July 2014
PDF: 8 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445D (31 July 2014); doi: 10.1117/12.2056473
Show Author Affiliations
Takayoshi Kohmura, Tokyo Univ. of Science (Japan)
Kenta Kaneko, Tokyo Univ. of Science (Japan)
RIKEN (Japan)
Hiroshi Tsunemi, Osaka Univ. (Japan)
Kiyoshi Hayashida, Osaka Univ. (Japan)
Ryo Nagino, Osaka Univ. (Japan)
Shota Inoue, Osaka Univ. (Japan)
Daiki Uchida, Osaka Univ. (Japan)
Shuhei Katada, Osaka Univ. (Japan)
Tadayasu Dotani, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Masanobu Ozaki, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Hiroshi Tomida, Japan Aerospace Exploration Agency (Japan)
Masashi Kimura, Japan Aerospace Exploration Agency (Japan)
Takeshi Go Tsuru, Kyoto Univ. (Japan)
Shoma Ikeda, Kogakuin Univ. (Japan)
Kazunari Yabe, Kogakuin Univ. (Japan)
Kento Miyakawa, Kogakuin Univ. (Japan)
Masato Andoh, Tokyo Univ. of Science (Japan)
Shintaro Kuwano, Tokyo Univ. of Science (Japan)
Yuta Sato, Tokyo Univ. of Science (Japan)
Kohki Tamasawa, Tokyo Univ. of Science (Japan)
Shoma Tanno, Tokyo Univ. of Science (Japan)
Yuma Yoshino, Tokyo Univ. of Science (Japan)

Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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