31 July 2014 Soft x-ray transmission of contamination blocking filter for SXI onboard ASTRO-H
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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.
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Takayoshi Kohmura, Takayoshi Kohmura, Kenta Kaneko, Kenta Kaneko, Hiroshi Tsunemi, Hiroshi Tsunemi, Kiyoshi Hayashida, Kiyoshi Hayashida, Ryo Nagino, Ryo Nagino, Shota Inoue, Shota Inoue, Daiki Uchida, Daiki Uchida, Shuhei Katada, Shuhei Katada, Tadayasu Dotani, Tadayasu Dotani, Masanobu Ozaki, Masanobu Ozaki, Hiroshi Tomida, Hiroshi Tomida, Masashi Kimura, Masashi Kimura, Takeshi Go Tsuru, Takeshi Go Tsuru, Shoma Ikeda, Shoma Ikeda, Kazunari Yabe, Kazunari Yabe, Kento Miyakawa, Kento Miyakawa, Masato Andoh, Masato Andoh, Shintaro Kuwano, Shintaro Kuwano, Yuta Sato, Yuta Sato, Kohki Tamasawa, Kohki Tamasawa, Shoma Tanno, Shoma Tanno, Yuma Yoshino, Yuma Yoshino, } "Soft x-ray transmission of contamination blocking filter for SXI onboard ASTRO-H", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445D (31 July 2014); doi: 10.1117/12.2056473; https://doi.org/10.1117/12.2056473
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