Energy gain scale calibration of the XRISM Resolve microcalorimeter spectrometer: ground calibration results and on orbit comparison

The Resolve instrument aboard the X-ray Imaging and Spectroscopy Mission (XRISM) is a 36-pixel microcalorimeter spectrometer that provides non-dispersive spectroscopy with 5 eV spectral resolution in the soft x-ray waveband. Resolve has a requirement to provide absolute energy-scale calibration of ± 2 eV from 0.3–12 keV. In this manuscript we describe our ground calibration strategy and results of a subset of the ground calibration campaigns, including a discussion of improvements in the energy scale ground calibration compared to Hitomi’s. These improvements include calibration of the low-energy band below 4 keV with the instrument in the flight dewar and the dewar aperture door open, which was not performed for Hitomi, and thorough measurements over an extended high-energy waveband to 22 keV. We also developed an improved technique for gain calibration of ‘mid-res’ secondary events, which have suppressed gain due to proximity to a preceding x-ray event (18-70 ms) on the same pixel. We provide an assessment of how well these pre-launch gain scales correct on-orbit data and discuss approaches for updating the gain curves. Energy-scale calibration approaches for future space-based instruments, including the X-ray Integral Field Unit (X-IFU) on Athena and the microcalorimeter spectrometer proposed for the Line Emission Mapper (LEM), have heritage in the calibration of XRISM. We briefly comment on lessons learned from Resolve calibration that are relevant for these future instruments.

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Published
2024-08-21
DOI
https://doi.org/10.1117/12.3019276
Citations
13
Primary Topic
Superconducting and THz Device Technology
Type
article
Field-Weighted Citation Impact
4.31

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Energy gain scale calibration of the XRISM Resolve microcalorimeter spectrometer: ground calibration results and on orbit comparison

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13 citations
Superconducting and THz Device Technology
4.31
article

Energy gain scale calibration of the XRISM Resolve microcalorimeter spectrometer: ground calibration results and on orbit comparison

Yoh Takei, Rob Wolfs, Kosuke Sato, R. F. Shipman, Ryuichi Fujimoto, Gary A. Sneiderman, Megan E. Eckart, Renata Cumbee, Steven J. Kenyon, Gregory V. Brown, Masahiro Tsujimoto, Michael Loewenstein, Chintan Shah, Maurice A. Leutenegger, F. S. Porter, Natalie Hell, C. P. de Vries, Makoto Sawada, Misaki Mizumoto, Yoshitaka Ishisaki, Shunji Kitamoto, S. Yamada, Caroline A. Kilbourne, M. C. Witthoeft, Meng P. Chiao, Richard L. Kelley, Tomomi Watanabe, Tahir Yaqoob, Thomas Lockard, Akio Hoshino, Edward W. Magee
article en
13 citations

Abstract

The Resolve instrument aboard the X-ray Imaging and Spectroscopy Mission (XRISM) is a 36-pixel microcalorimeter spectrometer that provides non-dispersive spectroscopy with 5 eV spectral resolution in the soft x-ray waveband. Resolve has a requirement to provide absolute energy-scale calibration of ± 2 eV from 0.3–12 keV. In this manuscript we describe our ground calibration strategy and results of a subset of the ground calibration campaigns, including a discussion of improvements in the energy scale ground calibration compared to Hitomi’s. These improvements include calibration of the low-energy band below 4 keV with the instrument in the flight dewar and the dewar aperture door open, which was not performed for Hitomi, and thorough measurements over an extended high-energy waveband to 22 keV. We also developed an improved technique for gain calibration of ‘mid-res’ secondary events, which have suppressed gain due to proximity to a preceding x-ray event (18-70 ms) on the same pixel. We provide an assessment of how well these pre-launch gain scales correct on-orbit data and discuss approaches for updating the gain curves. Energy-scale calibration approaches for future space-based instruments, including the X-ray Integral Field Unit (X-IFU) on Athena and the microcalorimeter spectrometer proposed for the Line Emission Mapper (LEM), have heritage in the calibration of XRISM. We briefly comment on lessons learned from Resolve calibration that are relevant for these future instruments.

Lawrence Livermore National Laboratory (US), Goddard Space Flight Center (US), Rikkyo University (JP), University of Teacher Education Fukuoka (JP), Japan Aerospace Exploration Agency (JP), Institute of Space and Astronautical Science (JP), Space Research Organisation Netherlands (NL), University of Maryland, College Park (US), Tokyo Metropolitan University (JP), Saitama University (JP)
U.S. Department of Energy, National Aeronautics and Space Administration, Goddard Space Flight Center, Japan Society for the Promotion of Science, Lawrence Livermore National Laboratory
Affordable and clean energy
Openalex Percentile: Top 6%
Superconducting and THz Device Technology
4.31
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