System design and implementation of the detector assembly for the Astro-H soft x-ray spectrometer

Chiao, Meng P.; Adams, J. S.; Goodwin, P.; Hobson, Clair W.; Kelley, R. L.; Kilbourne, C. A.; McCammon, D.; McGuinness, Daniel S.; Moseley, Samuel J.; Porter, F. S.; Shuman, S.; Watanabe, Tomomi

doi:10.1117/12.2231897

Cited by 10 publications

(8 citation statements)

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“…The CTS was suspended within the structure of the DA (detector assembly) that ran nominally at 1.3 K. Design details of the DA are found in Ref. 8. The CTSL-F closed out the detector enclosure.…”

Section: Componentsmentioning

confidence: 99%

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Design, implementation, and performance of the Astro-H soft x-ray spectrometer aperture assembly and blocking filters

Kilbourne

Adams

Arsenović

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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The calorimeter array of the JAXA Astro-H (renamed Hitomi) soft x-ray spectrometer (SXS) was designed to provide unprecedented spectral resolution of spatially extended cosmic x-ray sources and of all cosmic x-ray sources in the Fe-K band around 6 keV. The properties that made the SXS array a powerful x-ray spectrometer also made it sensitive to photons from the entire electromagnetic band as well as particles. If characterized as a bolometer, it would have had a noise equivalent power of <4 × 10 −18 W∕ðHzÞ 0.5 . Thus, it was imperative to shield the detector from thermal radiation from the instrument and optical and UV photons from the sky. In addition, it was necessary to shield the coldest stages of the instrument from the thermal radiation emanating from the warmer stages. These needs were addressed by a series of five thin-film radiation-blocking filters, anchored to the nested temperature stages, that blocked long-wavelength radiation while minimizing x-ray attenuation. The aperture assembly was a system of barriers, baffles, filter carriers, and filter mounts that supported the filters and inhibited their potential contamination. The three outer filters also had been equipped with thermometers and heaters for decontamination. We present the requirements, design, implementation, and performance of the SXS aperture assembly and blocking filters. © 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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Section: Componentsmentioning

confidence: 99%

“…The alignment of the detector and the CTS and DA apertures is discussed in Ref. 8. The JTB, IVCS-M, and the ApC-SA did not use alignment pins.…”

Section: Integration Into the Dewarmentioning

confidence: 99%

Design, implementation, and performance of the Astro-H soft x-ray spectrometer aperture assembly and blocking filters

Kilbourne

Adams

Arsenović

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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“…The detectors are mounted within their 50-mK heat sink, hereafter called the CTS. The CTS is mechanically supported by a Kevlar assembly from the ∼1.3-K DA 20 and connected thermally to the ADR by flexible thermal foils. A package of four germanium resistance thermometers, used for 50-mK control and temperature monitoring, are integral to the CTS.…”

Section: Cooling System Overviewmentioning

confidence: 99%

Cryogen-free operation of the Soft X-ray Spectrometer instrument

Sneiderman

Shirron

Fujimoto

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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Abstract. The Soft X-ray Spectrometer (SXS) is the first space-based instrument to implement operational redundancy of a sub-Kelvin cooling system. Its cooling system includes a superfluid helium cryostat and five cryocoolers, provided by Japan Aerospace Exploration Agency, and three adiabatic demagnetization refrigerators (ADRs) with four active heat switches, provided by NASA. These elements are configured in one of two ways to control the heat sink of the x-ray microcalorimeter detectors at 50 mK. The "helium mode," the simpler of the two modes, is used while liquid helium is present and uses all five cryocoolers and two ADRs. The first two ADR stages operate together and reject their heat directly to the liquid at ∼1.1 K. In the "cryogen-free mode," for operation after the helium is depleted, the first stage ADR operation is unchanged, the second stage is repurposed to control the empty helium tank at ∼1.5 K, and the third stage transfers heat from the 1.5-K stage to the 4.5-K interface of the Joule-Thomson cooler. The development and verification details of this capability are presented within this paper and offer valuable insights into the challenges, successes, and lessons that can benefit other missions, particularly those employing cryogen-free or hybrid cooling systems. © 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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“…4) in order to aid in planning for future microcalorimeter missions. Details are found in other articles of the same special section for the spacecraft, 1 the overall mission instrument, 2 the sensor and its performance, [8][9][10][11] the mirror and the aperture assembly, 12,13 the cooling chain, 5,14-17 the vibration isolation system, 18 the filter wheel (FW), 4 and the signal processing. 19,20 All data presented here are available in Ref.…”

Section: Introductionmentioning

confidence: 99%

In-orbit operation of the soft x-ray spectrometer onboard the Hitomi satellite

Tsujimoto

Mitsuda

Kelley

et al. 2017

J. Astron. Telesc. Instrum. Syst

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Abstract. We summarize all of the in-orbit operations of the soft x-ray spectrometer (SXS) onboard the ASTRO-H (Hitomi) satellite. The satellite was launched on February 17, 2016, and the communication with the satellite ceased on March 26, 2016. The SXS was still in the commissioning phase, in which the set-ups were progressively changed. This paper is intended to serve as a concise reference of the events in orbit in order to properly interpret the SXS data taken during its short lifetime and as a test case for planning the in-orbit operation for future microcalorimeter missions.

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System design and implementation of the detector assembly for the Astro-H soft x-ray spectrometer

Cited by 10 publications

References 0 publications

Design, implementation, and performance of the Astro-H soft x-ray spectrometer aperture assembly and blocking filters

Design, implementation, and performance of the Astro-H soft x-ray spectrometer aperture assembly and blocking filters

Cryogen-free operation of the Soft X-ray Spectrometer instrument

In-orbit operation of the soft x-ray spectrometer onboard the Hitomi satellite

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