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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and 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); https://doi.org/10.1117/12.2056473
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