DOE OSTI · 3014605
In-flight performance of the XRISM/Resolve detector system
Abstract
The Resolve instrument was launched on board the XRISM observatory in early September 2023. The Resolve spectrometer is based on a high-sensitivity X-ray calorimeter detector system (DS) that has been successfully deployed in many ground and sub-orbital spectrometers. However, the Resolve instrument is the first long-term implementation in space. The instrument will provide essential diagnostics for nearly every class of X-ray emitting objects, from galactic supernova remnants to the outskirts of galaxy clusters, without degradation for spatially extended objects. The Resolve DS consists of a 36-pixel microcalorimeter array operated at a heat sink temperature of 50 mK. In pre-flight testing, the DS demonstrated a resolving power of better than 1300 at 6 keV with a simultaneous bandpass from below 0.3 keV to above 12 keV and a timing precision better than 100μs. An anti-coincidence detector placed directly behind the microcalorimeter array effectively suppresses background. The detector energy-resolution budget included terms for interference from the Resolve cooling system and the spacecraft. Additional terms for energy-scale stability, on-orbit effects, and use of mid-grade events were also included, predicting an end-of-life, on-orbit performance for high- and mid-resolution grade events that meet the requirement of 7 eV FWHM at 6 keV. Here, we discuss the actual on-orbit performance of the Resolve DS and compare this with the performance in pre-flight testing, on-orbit predictions, and the almost identical Hitomi/SXS instrument. We will also discuss the on-orbit gain stability, an assessment of on-orbit interference, and measurements of the on-orbit background.
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Porter, Frederick Scott [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Kilbourne, Caroline A. [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Chiao, Meng P. [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Cumbee, Renata S. [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Eckart, Megan E. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)], Fujimoto, Ryuichi [Japan Aerospace Exploration Agency, Tokyo (Japan)], Ishisaki, Yoshitaka [Tokyo Metropolitan University (Japan)], Kanemaru, Yoshiaki [Japan Aerospace Exploration Agency, Tokyo (Japan)], Kelley, Richard L. [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Leutenegger, Maurice Andrew [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Maeda, Yoshitomo [Japan Aerospace Exploration Agency, Tokyo (Japan)], Mizumoto, Misaki [University of Teacher Education Fukuoka (UETF) (Japan)], Sato, Kosuke [Saitama University (Japan)], Sawada, Makoto [Rikkyo University, Tokyo (Japan)], Sneiderman, Gary A. [NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)], Takei, Yoh [Japan Aerospace Exploration Agency, Tokyo (Japan)], Tsujimoto, Masahiro [Japan Aerospace Exploration Agency, Tokyo (Japan)], Uchida, Yuusuke [Tokyo University of Science (Japan)], Watanabe, Tomomi [BAE Systems, Inc., Falls Church, VA (United States)], Yamada, Shin'ya [Rikkyo University, Tokyo (Japan)]. 2025-10-06. In-flight performance of the XRISM/Resolve detector system. https://doi.org/10.1117/1.jatis.11.4.042016
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