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Proceedings Paper

Measuring the EUV and optical transmission of optical blocking layer for x-ray CCD camera
Author(s): Takayoshi Kohmura; Kohei Kawai; Tatsuo Watanabe; Taiki Ogawa; Shoma Ikeda; Kaoru Ushiyama; Kenta Kaneko; Shunji Kitamoto; Hiroshi Murakami; Eri Takenaka; Kenta Nagasaki; Keiichi Higashi; Masaki Yoshida; Hiroshi Tsunemi; Kiyoshi Hayashida; Naohisa Anabuki; Hiroshi Nakajima; Rui Sakaguchi; Kazuo Shigeyama; Shutaro Ueda; Takeshi Go Tsuru; Tadayasu Dotani; Masanobu Ozaki; Aya Bamba; Junko S. Hiraga; Koji Mori
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Paper Abstract

We have developed a new back-illuminated (BI) CCD which has an Optical Blocking Layer (OBL) directly coating its X-ray illumination surface with Aluminum-Polyimide-Aluminum instead of Optical Blocking Filter (OBF). OBL is composed of a thin polyimide layer sandwiched by two Al layers. Polyimide and Al has a capability to cut EUV and optical light, respectively. The X-ray CCD is affected by large doses of extreme ultraviolet (EUV) radiation from Earth sun-lit atmosphere (airglow) in orbit as well as the optical light. In order to evaluate the performance of the EUV-attenuating polyimide of the OBL, we measured the EUV transmission of both the OBL and the OBF at energies between 15-72 eV by utilizing a beam line located at the Photon Factory in High Energy Accelerator Research Organization (KEK-PF). We obtained the EUV transmission to be 3% at 41 eV which is the same as the expected transmission from the designed thickness of the polyimide layer. We also found no significant change of the EUV transmission of polyimide over the nine month interval spanned by out two experiments. We also measured the optical transmission of the OBL at wavelengths between 500-900Å to evaluate the performance of the Al that attenuates optical light, and found the optical transmission to be less than 4×10-5.

Paper Details

Date Published: 29 July 2010
PDF: 8 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77323D (29 July 2010); doi: 10.1117/12.856767
Show Author Affiliations
Takayoshi Kohmura, Kogakuin Univ. (Japan)
Kohei Kawai, Kogakuin Univ. (Japan)
Tatsuo Watanabe, Kogakuin Univ. (Japan)
Taiki Ogawa, Kogakuin Univ. (Japan)
Shoma Ikeda, Kogakuin Univ. (Japan)
Kaoru Ushiyama, Kogakuin Univ. (Japan)
Kenta Kaneko, Kogakuin Univ. (Japan)
Shunji Kitamoto, Rikkyo Univ. (Japan)
Hiroshi Murakami, Rikkyo Univ. (Japan)
Eri Takenaka, Rikkyo Univ. (Japan)
Kenta Nagasaki, Rikkyo Univ. (Japan)
Keiichi Higashi, Rikkyo Univ. (Japan)
Masaki Yoshida, Rikkyo Univ. (Japan)
Hiroshi Tsunemi, Osaka Univ. (Japan)
Kiyoshi Hayashida, Osaka Univ. (Japan)
Naohisa Anabuki, Osaka Univ. (Japan)
Hiroshi Nakajima, Osaka Univ. (Japan)
Rui Sakaguchi, Osaka Univ. (Japan)
Kazuo Shigeyama, Osaka Univ. (Japan)
Shutaro Ueda, Osaka Univ. (Japan)
Takeshi Go Tsuru, Kyoto Univ. (Japan)
Tadayasu Dotani, Institute of Space and Aeronautical Science (Japan)
Masanobu Ozaki, Institute of Space and Aeronautical Science (Japan)
Aya Bamba, Institute of Space and Aeronautical Science (Japan)
Junko S. Hiraga, The Univ. of Tokyo (Japan)
Koji Mori, Univ. of Miyazaki (Japan)


Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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