High count rate effects in event processing for XRISM/Resolve x-ray microcalorimeter

Misaki Mizumoto; Masahiro Tsujimoto; Renata S. Cumbee; Megan E. Eckart; Yoshitaka Ishisaki; Caroline A. Kilbourne; Edmund Hodges-Kluck; Maurice A. Leutenegger; Frederick S. Porter; Makoto Sawada; Yoh Takei; Yuusuke Uchida; Shin'ya Yamada

doi:10.1117/12.2628784

31 August 2022 High count rate effects in event processing for XRISM/Resolve x-ray microcalorimeter

Misaki Mizumoto, Masahiro Tsujimoto, Renata S. Cumbee, Megan E. Eckart, Yoshitaka Ishisaki, Caroline A. Kilbourne, Edmund Hodges-Kluck, Maurice A. Leutenegger, Frederick S. Porter, Makoto Sawada, Yoh Takei, Yuusuke Uchida, Shin'ya Yamada

Author Affiliations +

Proceedings Volume 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray; 121815Z (2022) https://doi.org/10.1117/12.2628784
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The spectroscopic performance of x-ray instruments can be affected at high count rates. The effects and mitigation in the optical chain, such as x-ray attenuation filters or de-focusing mirrors, are widely discussed, but those in the signal chain are not. Using the Resolve x-ray microcalorimeter onboard the XRISM satellite, we discuss the effects observed during high count rate measurements and how these can be modeled. We focus on three instrumental effects that impact performance at high count rate: CPU limit, pile up, and electrical cross talk. High count rate data were obtained during ground testing using the flight model instrument and a calibration xray source. A simulated observation of GX 13+1 is presented to illustrate how to estimate these effects based on these models for observation planning. The impact of these effects on high count rate observations is discussed.

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Misaki Mizumoto, Masahiro Tsujimoto, Renata S. Cumbee, Megan E. Eckart, Yoshitaka Ishisaki, Caroline A. Kilbourne, Edmund Hodges-Kluck, Maurice A. Leutenegger, Frederick S. Porter, Makoto Sawada, Yoh Takei, Yuusuke Uchida, and Shin'ya Yamada "High count rate effects in event processing for XRISM/Resolve x-ray microcalorimeter", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 121815Z (31 August 2022); https://doi.org/10.1117/12.2628784

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