Development of the soft x-ray imager (SXI) for ASTRO-H

Hayashida, Kentaro; Tsunemi, H.; Tsuru, Takeshi Go; Dotani, Tadayasu; Nakajima, Hiroshi; Anabuki, Naohisa; Ozaki, Masanobu; Natsukari, Chikara; Hiraga, Junko S.; Tomida, H.; Kohmura, Takayoshi; Murakami, Hiroshi; Mori, Koji; Yamauchi, M.; Hatsukade, Isamu; Bamba, Aya; Uchida, Hiroyuki; Nobukawa, Masayoshi; Ueda, Shutaro; Fujinaga, Takahisa; Matsuta, Keiko; Ohnishi, Teruaki; Doty, J.

doi:10.1117/12.893400

Cited by 4 publications

(4 citation statements)

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“…We developed a P-channel BI CCD for the SXI, Pch-NeXT4, in collaboration with Hamamatsu Photonics K.K. [4,5] ("NeXT" is the former project name of the Astro-H satellite). The Pch-NeXT4 is a frame transfer type CCD with an imaging area of 30.72 mm square.…”

Section: P-channel Ccd Used In This Experimentsmentioning

confidence: 99%

“…Recently, a new type of P-channel CCD has become available with a thick depletion layer of a few hundred µm [3]. We employ the new P-channel CCD for Soft X-ray Imager (SXI) [4,5], a new CCD camera onboard the upcoming Astro-H satellite [6]. Using the P-channel CCD as a BI device with a depletion layer thickness of 200 µm, high detection efficiency for both hard and soft X-ray photons can be achieved.…”

Section: Introductionmentioning

confidence: 99%

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Proton radiation damage experiment on P-Channel CCD for an X-ray CCD camera onboard the ASTRO-H satellite

Mori

Nishioka

Ohura

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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24We report on a proton radiation damage experiment on P-channel CCD newly developed for an X-ray CCD camera onboard the Astro-H satellite.The device was exposed up to 10 9 protons cm −2 at 6.7 MeV. The charge transfer inefficiency (CTI) was measured as a function of radiation dose. In comparison with the CTI currently measured in the CCD camera onboard the Suzaku satellite for 6 years, we confirmed that the new type of P-channelPreprint submitted to Nuclear Physics B June 25, 2013 CCD is radiation tolerant enough for space use. We also confirmed that a charge-injection technique and lowering the operating temperature efficiently work to reduce the CTI for our device. A comparison with other P-channel CCD experiments is also discussed.

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Section: P-channel Ccd Used In This Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proton radiation damage experiment on P-Channel CCD for an X-ray CCD camera onboard the ASTRO-H satellite

Mori

Nishioka

Ohura

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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“…The Soft X-ray Imager (SXI) [3][4][5][6][7][8][9] is an imaging spectrometer aboard Hitomi covering the energy range between 0.4 and 12 keV. X-rays are focused by the Wolter type I mirror optics, the Soft X-ray Telescope (SXT-I), 10 with a focal length of 5.6 m. An array of x-ray charge-coupled devices (CCDs) covers a large field of view (FoV) of 38 0 × 38 0 .…”

Section: Introductionmentioning

confidence: 99%

“…Hitomi, 1,2 formerly known as ASTRO-H, is the sixth Japanese X-ray astronomy satellite, which was launched on February 17, 2016 aboard an H-IIA rocket from JAXA's Tanegashima Space Center. The Soft X-ray Imager (SXI) [3][4][5][6][7][8][9] is an imaging spectrometer aboard Hitomi covering the energy range between 0.4 keV and 12 keV. X-rays are focused by the Wolter type I mirror optics, the Soft X-ray Telescope (SXT-I), 10 with a focal length of 5.6 m. An array of X-ray charge-coupled devices (CCDs) covers a large field-of-view (FoV) of 38 ′ × 38 ′ .…”

Section: Introductionmentioning

confidence: 99%

Soft X-ray Imager aboard Hitomi (ASTRO-H)

Tanaka¹,

Uchida²,

Nakajima

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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Abstract. The Soft X-ray Imager (SXI) is an imaging spectrometer using charge-coupled devices (CCDs) aboard the Hitomi x-ray observatory. The SXI sensor has four CCDs with an imaging area size of 31 mm × 31 mm arranged in a 2 × 2 array. Combined with the x-ray mirror, the Soft X-ray Telescope, the SXI detects x-rays between 0.4 and 12 keV and covers a 38 0 × 38 0 field of view. The CCDs are P-channel fully depleted, back-illumination type with a depletion layer thickness of 200 μm. Low operation temperature down to −120°C as well as charge injection is employed to reduce the charge transfer inefficiency (CTI) of the CCDs. The functionality and performance of the SXI are verified in on-ground tests. The energy resolution measured is 161 to 170 eV in full width at half maximum for 5.9-keV x-rays. In the tests, we found that the CTI of some regions is significantly higher. A method is developed to properly treat the position-dependent CTI. Another problem we found is pinholes in the Al coating on the incident surface of the CCDs for optical light blocking. The Al thickness of the contamination blocking filter is increased to sufficiently block optical light. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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