Soft x-ray imager (SXI) onboard ASTRO-H

Tsunemi, H.; Hayashida, Kentaro; Tsuru, Takeshi Go; Dotani, Tadayasu; Hiraga, Junko S.; Anabuki, Naohisa; Bamba, Aya; Hatsukade, Isamu; Kohmura, Takayoshi; Mori, Koichi; Murakami, Hiroshi; Nakajima, Hiroshi; Uchida, Hiroyuki; Yamauchi, M.

doi:10.1117/12.856087

Cited by 19 publications

(14 citation statements)

References 18 publications

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“…After the EOB extension, we started commissioning the filter wheel electronics (FWE), which was the last SXS subsystem to be powered. The filter wheel was rotated on day 30 in order to provide X-ray illumination of the whole array by 55 Fe sources. The resulting calibration data set was used to refine the gain scales and measure the energy resolutions of the individual pixels.…”

Section: -mentioning

confidence: 99%

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The ASTRO-H (Hitomi) x-ray astronomy satellite

et al. 2016

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The Hitomi (ASTRO-H) mission is the sixth Japanese X-ray astronomy satellite developed by a large international collaboration, including Japan, USA, Canada, and Europe. The mission aimed to provide the highest energy resolution ever achieved at E > 2 keV, using a microcalorimeter instrument, and to cover a wide energy range spanning four decades in energy from soft X-rays to gamma-rays. After a successful launch on 2016 February 17, the spacecraft lost its function on 2016 March 26, but the commissioning phase for about a month provided valuable information on the on-board instruments and the spacecraft

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Section: -mentioning

confidence: 99%

“…The soft X-ray imaging system is consisted of an imaging mirror, the Soft X-ray Telescope (SXT-I), and a CCD camera, the Soft X-ray Imager (SXI), as well as the cooling system. [52][53][54][55][56][57] Fig. 7 (left) shows a photograph of the SXI detector.…”

Section: Soft X-ray Imagermentioning

confidence: 99%

The ASTRO-H (Hitomi) x-ray astronomy satellite

et al. 2016

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“…The first term represents the effective output signal S(z) of ADC while the second one is the residual quantization noise. According to (2), in the time domain, s(n) is the convolution of v in (n) and the filter's impulse response h(n). Given the modulator's inputs during the post phase are always 0, the filter's decimation output of every conversion becomes…”

Section: B Decimation Filtermentioning

confidence: 99%

“…Therefore, X-ray CCDs have a good reputation in modern astronomical observation and high-energy particle detection due to their excellent spatial resolution and sufficient energy resolution [1]. They have been successfully utilized in recent astronomical satellites such as the missions of ASTRO-H from Japan [2], CLASS from India [3], and HXMT from China [4].…”

Section: Introductionmentioning

confidence: 99%

A Fully Integrated 0.055% INL X-ray CCD Readout ASIC with Incremental <inline-formula> <tex-math notation="LaTeX">$\Delta \Sigma {\text{ADC}}$</tex-math> </inline-formula>

Wang

Cao

et al. 2016

IEEE Trans. Nucl. Sci.

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A fully integrated 100 kHz X-ray charge coupled device (CCD) readout application specific integrated circuit (ASIC) employing delta sigma (ΔΣ) digitization is presented. To achieve high linearity with small chip size and low power consumption, the correlated double sampling (CDS) is realized by the ΣΔADC instead of the analog front end (AFE) as in conventional CCD readout circuits. Besides, the proposed decimation filter features simple structure and eases the integration. The chip is fabricated in 0.35 µm CMOS technology and the measured integral nonlinearity (INL) throughout the input dynamic range of ASIC is 0.055% with 35.1 ± 0.3 µV input referred noise. A CCD detection system is built and tested with the sensitivity of CCD being 4 µV/e − . The integration test results show that the readout noise is 11.8 e − at 100 kHz readout pixel rate and the achieved energy spectrum resolution is 168 eV ± 4.7 eV (Full Width at Half Maximum: FWHM) at 5.9 keV.Index Terms-ASIC, CCD readout, incremental ΣΔADC, low noise.

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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%

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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Soft x-ray imager (SXI) onboard ASTRO-H

Cited by 19 publications

References 18 publications

The ASTRO-H (Hitomi) x-ray astronomy satellite

The ASTRO-H (Hitomi) x-ray astronomy satellite

A Fully Integrated 0.055% INL X-ray CCD Readout ASIC with Incremental <inline-formula> <tex-math notation="LaTeX">$\Delta \Sigma {\text{ADC}}$</tex-math> </inline-formula>

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

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