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

Tsujimoto, Masahiro; Mitsuda, Kazuhisa; Kelley, R. L.; Herder, Jan-Willem A. den; Bialas, Thomas G.; Boyce, K. R.; Chiao, Meng P.; Vries, C. P. de; DiPirro, Michael; Eckart, Megan E.; Ezoe, Yuichiro; Fujimoto, R.; Hoshino, Akio; Ishikawa, Kumi; Ishisaki, Yoshitaka; Kilbourne, C. A.; Koyama, Shu; Leutenegger, Maurice A.; Masters, Candace; Mitsuishi, Ikuyuki; Noda, Hirofumi; Okajima, Takashi; Okamoto, Atsushi; Porter, F. S.; Sato, Kosuke; Sato, Yukiyo; Savinell, Joseph C.; Sawada, Makoto; Seta, Hiromi; Shirron, Peter; Sneiderman, Gary A.; Takei, Yoh; Tamagawa, Toru; Tashiro, M.; Watanabe, Tomomi; Yamada, S.; Yamasaki, Noriko Y.; Yatsu, Yoichi

doi:10.1117/1.jatis.4.1.011205

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…The SXS was commissioned shortly after launch and began making astronomical measurements 4 just days into the mission. 5 The instrument performed as expected until the untimely loss of the mission on March 26, 2016. The SXS microcalorimeter array 6 consisted of ion-implanted silicon thermistors and HgTe thermalizing x-ray absorbers that operate at a heat-sink temperature of 50 mK. Because of this low operating temperature, the optical path of the SXS included a set of five thin-film aluminized polyimide filters anchored to nested temperature stages.…”

Section: Introductionmentioning

confidence: 72%

“…We intended to open the gate valve at the end of the commissioning phase, ∼40 days into the mission, when the spacecraft outgassing rate was predicted to have been low enough to avoid contamination of the dewar optical blocking filters. 5 The x-ray transmission of the Be Table 3 Absorber measurement summary. The absorbers are beveled such that the front surface is slightly larger than the back surface.…”

Section: Gate Valve Beryllium Windowmentioning

confidence: 99%

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Ground calibration of the Astro-H (Hitomi) soft x-ray spectrometer

Eckart

Adams

Boyce

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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Ground calibration of the Astro-H (Hitomi) soft x-ray spectrometer," J. Astron. Telesc.Abstract. The Astro-H (Hitomi) Soft X-ray Spectrometer (SXS) was a pioneering imaging x-ray spectrometer with 5 eV energy resolution at 6 keV. The instrument used a microcalorimeter array at the focus of a highthroughput soft x-ray telescope to enable high-resolution nondispersive spectroscopy in the soft x-ray waveband (0.3 to 12 keV). We present the suite of ground calibration measurements acquired from 2012 to 2015, including characterization of the detector system, anti-coincidence detector, optical blocking filters, and filter-wheel filters. The calibration of the 36-pixel silicon thermistor microcalorimeter array includes parameterizations of the energy gain scale and line-spread function for each event grade over a range of instrument operating conditions, as well as quantum efficiency measurements. The x-ray transmission of the set of five Al/polyimide thin-film optical blocking filters mounted inside the SXS dewar has been modeled based on measurements at synchrotron beamlines, including with high spectral resolution at the C, N, O, and Al K-edges. In addition, we present the x-ray transmission of the dewar gate valve and of the filters mounted on the SXS filter wheel (external to the dewar), including beryllium, polyimide, and neutral density filters.

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Section: Introductionmentioning

confidence: 72%

Section: Gate Valve Beryllium Windowmentioning

confidence: 99%

Ground calibration of the Astro-H (Hitomi) soft x-ray spectrometer

Eckart

Adams

Boyce

et al. 2018

J. Astron. Telesc. Instrum. Syst.

Self Cite

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“…The shape of the Bremsstrahlung is a little different, but depends quite a bit on the exact match of the accelerating voltage (supposed to be 11. 3 kV, but which has some margin of error (about ±0.3 kV) for the measurements). In addition, the decrease of SDD efficiency due to the limited thickness of the silicon of the detector has not been taken into account.…”

Section: Model Validationmentioning

confidence: 94%

Simulating Modulated X-ray calibration Sources for future X-ray missions, using GEANT4

Vries

Fioretti

Herder

et al. 2018

Preprint

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The XIFU X-ray spectrometer instrument on the future Athena mission needs X-ray calibration sources to calibrate the gains of the individual detector pixels. For this purpose, electronically controlled Modulated X-ray Sources (MXS) are proposed, similar to the calibrations sources used on the Hitomi spacecraft and which will also fly on its successor, XARM. Here we present a simulation package based on the particle transport GEANT4 toolkit. Using this package, we compute the results for different targets and window configurations for the MXS's. The simulations expose the trade-offs to be made to select the optimum source configuration for the Athena/XIFU and XARM/Resolve spectrometer instruments.

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“…The SXS was still in the commissioning phase when Hitomi lost attitude control. The in-orbit operation of the SXS, including the operations of the power system, cooling system, and signal acquisition system, was a complete success [51]. For the cooling system to run detectors at 50 mK, the cooling chain worked successfully as mentioned above, and cooling is performed by the ADR and the temperature is kept within a few µ Kelvin by Proportional-Integral-Differential (PID) control in orbit [9].…”

Section: Gain Correction and Line Spread Functionmentioning

confidence: 99%

Space Educational Program of the Tokyo University of Science: A Trial for Space Education

Sato

Kimura

Ueno

et al. 2019

AEROSPACE TECHNOLOGY JAPAN

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In 2015, Tokyo University of Science (TUS) started the TUS Space Educational Program (T-SEP). This program includes not only lectures on space science and technology but also hands-on trainings with onboard equipment and projectbased learning utilizing parabolic microgravity flight and CANSAT. During such project-based learning process, students learn the complete process involved in space missions, such as mission design, implementation, project management, and operations regarding various constraints. Such learning is very effective for acquiring individual knowledge of space science and technology and also acquiring skills required for space missions. The first author of this paper was one of the first T-SEP students in 2015 and one of the best examples of the impact of this program. In addition, he continues to participate as a mentor to support T-SEP. This paper outlines T-SEP results since 2015 from the viewpoint of a mentor having experience as one of the first students.

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

Cited by 7 publications

References 24 publications

Ground calibration of the Astro-H (Hitomi) soft x-ray spectrometer

Ground calibration of the Astro-H (Hitomi) soft x-ray spectrometer

Simulating Modulated X-ray calibration Sources for future X-ray missions, using GEANT4

Space Educational Program of the Tokyo University of Science: A Trial for Space Education

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