Ground test results of the micro-vibration interference for the x-ray microcalorimeter onboard XRISM

Takashi Hasebe; Ryuta Imamura; Masahiro Tsujimoto; Hisamitsu Awaki; Meng P. Chiao; Ryuichi Fujimoto; Leslie S. Hartz; Gary A. Sneiderman; Yoh Takei; Susumu Yasuda

doi:10.1117/12.2629782

31 August 2022 Ground test results of the micro-vibration interference for the x-ray microcalorimeter onboard XRISM

Takashi Hasebe, Ryuta Imamura, Masahiro Tsujimoto, Hisamitsu Awaki, Meng P. Chiao, Ryuichi Fujimoto, Leslie S. Hartz, Gary A. Sneiderman, Yoh Takei, Susumu Yasuda

Author Affiliations +

Proceedings Volume 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray; 1218163 (2022) https://doi.org/10.1117/12.2629782
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Resolve is a payload hosting an x-ray microcalorimeter detector operated at 50 mK in the X-Ray Imaging and Spectroscopy Mission (XRISM), which is currently under development by an international collaboration and is planned to be launched in 2023. One of the technical concerns is the micro-vibration interference to the sensitive microcalorimeter detector by the spacecraft bus components. We verified this in a series of the ground tests in 2021–2022, the results of which are reported here. We defined the micro-vibration interface between the spacecraft and the Resolve instrument. In the instrument-level test, we tested the flight-model hardware against the interface level by injecting micro-vibration using vibrators and evaluated the instrument response using the 50 mK stage temperature stability, the ADR magnet current consumption rate, and the detector noise spectra. We found the strong responses when injecting micro-vibration at ∼200, 380, and 610 Hz. In the former two cases, the beat among the injected frequency and the cryocooler frequency harmonics are also observed in the detector noise spectra. In the spacecraft-level test, we measured the acceleration and the instrument responses with and without suspending the entire spacecraft. The reaction wheels and the inertial reference units, two major sources of micro-vibration among the bus components, were operated. We found that the observed Resolve responses are within acceptable levels.

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Takashi Hasebe, Ryuta Imamura, Masahiro Tsujimoto, Hisamitsu Awaki, Meng P. Chiao, Ryuichi Fujimoto, Leslie S. Hartz, Gary A. Sneiderman, Yoh Takei, and Susumu Yasuda "Ground test results of the micro-vibration interference for the x-ray microcalorimeter onboard XRISM", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 1218163 (31 August 2022); https://doi.org/10.1117/12.2629782

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