Results of accelerometer monitor in the ground testing of Resolve x-ray microcalorimeter instrument onboard XRISM

Imamura, Ryuta; Tsujimoto, Masahiro; Awaki, Hisamitsu; Chiao, Meng P.; Fujimoto, R.; Ishisaki, Yoshitaka; Kelley, R. L.; Kilbourne, C. A.; Porter, F. S.; Sawada, Makoto; Sneiderman, Gary A.; Takei, Yoh; Yamada, S.

doi:10.1117/12.2629773

Cited by 2 publications

(9 citation statements)

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“…The former two frequencies are of particular interest as they match with the 4’th and 7’th harmonics of the JTC drive frequency, at which peculiar responses in the detector noise spectra were observed during the JTC frequency tuning in different experiments 11 , 12 . We did not observe such responses in other JTC harmonics.…”

Section: Resultsmentioning

confidence: 64%

“…We speculate that the instrument has a resonance at these frequencies in cold stages, where the two harmonic lines of the JTC and STC are mixed and amplified non-linearly to redistribute some power into the beat frequency at <20 Hz. They were found to be dissipated somehow into heat at the cold stage, as the beat frequency noise was not observed when the detector bias was off to be insensitive to heat 11 , 12 . The elevated levels of Trms and dIADR/dt is considered to be related to these resonances.…”

Section: Resultsmentioning

confidence: 94%

“…It has an improved design that includes a launch-lock mechanism and has better dumping performance 10 . The micro-vibration interference by the cryocoolers to the detector is discussed in a separate paper 11 , 12 …”

Section: Introductionmentioning

confidence: 99%

“…10 The micro-vibration interference by the cryocoolers to the detector is discussed in a separate paper. 11,12 In addition to the cryocoolers in the instrument, the spacecraft also hosts potential microvibration sources, such as reaction wheels (RWs) and inertial reference units (IRU), in the attitude control system. In the case of SXS, these components exhibited some hints of microvibration interference during the spacecraft test.…”

Section: Introductionmentioning

confidence: 99%

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Ground test results of the microvibration interference for the x-ray microcalorimeter onboard x-ray imaging and spectroscopy mission

Hasebe

Tsujimoto

Awaki

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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.Resolve is a payload hosting an x-ray microcalorimeter detector operated at 50 mK in the x-ray imaging and spectroscopy mission. It is currently under development as part of an international collaboration and is planned to be launched in 2023. A primary technical concern is the microvibration interference in the sensitive microcalorimeter detector caused by the spacecraft bus components. We conducted a series of verification tests in 2021 to 2022 on the ground, the results of which are reported here. We defined the microvibration interface between the spacecraft and the Resolve instrument. In the instrument-level test, the flight-model hardware was tested against the interface level by injecting it with microvibrations and evaluating the instrument response using the 50 mK stage temperature stability, adiabatic demagnetization refrigerator magnet current consumption rate, and detector noise spectra. We found strong responses when injecting microvibration at ∼200, 380, and 610 Hz. In the former two cases, the beat between the injected frequency and cryocooler frequency harmonics were observed in the detector noise spectra. In the spacecraft-level test, the acceleration and instrument responses were measured with and without suspension of the entire spacecraft. The reaction wheels (RWs) and inertial reference units (IRUs), two major sources of microvibration among the bus components, were operated. In conclusion, the observed responses of Resolve are within the acceptable levels in the nominal operational range of the RWs and IRUs. There is no evidence that the resultant energy resolution degradation is beyond the current allocation of noise budget.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ground test results of the microvibration interference for the x-ray microcalorimeter onboard x-ray imaging and spectroscopy mission

Hasebe

Tsujimoto

Awaki

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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“…Data of nominal bias without MTQ operation (green) is shown for comparison. The 150 and 156 Hz lines are, respectively, the third harmonic of the commercial AC and a cryocooler drive 24 , 25 . (b) Time-domain data of the drive voltage (blue) and response of the microcalorimeter for pixel 9 (orange), 27 (green), and the anti-co (red) during the 20% (solid) and 80% (dashed) duty drive.…”

Section: Magnetic Emimentioning

confidence: 99%

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

Kurihara

Tsujimoto

Eckart

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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.Electromagnetic interference (EMI) for low-temperature detectors is a serious concern in many missions. We investigate the EMI caused by the spacecraft components to the x-ray microcalorimeter of the Resolve instrument onboard the x-ray imaging and spectroscopy mission, which is currently under development by an international collaboration and is planned to be launched in 2023. We focus on the EMI from (a) the low-frequency magnetic field generated by the magnetic torquers (MTQ) used for the spacecraft attitude control and (b) the radio-frequency (RF) electromagnetic field generated by the S and X band antennas used for communication between the spacecraft and the ground stations. We executed a series of ground tests both at the instrument and spacecraft levels using the flight-model hardware in 2021–2022 in a JAXA facility in Tsukuba. We also conducted electromagnetic simulations partially using the Fugaku high-performance computing facility. The MTQs were found to couple with the microcalorimeter, which we speculate through pick-ups of low-frequency magnetic field and further capacitive coupling. There is no evidence that the resultant energy resolution degradation is beyond the current allocation of noise budget. The RF communication system was found to leave no significant effect. We present the result of the tests and simulation in this article.

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Results of accelerometer monitor in the ground testing of Resolve x-ray microcalorimeter instrument onboard XRISM

Cited by 2 publications

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Ground test results of the microvibration interference for the x-ray microcalorimeter onboard x-ray imaging and spectroscopy mission

Ground test results of the microvibration interference for the x-ray microcalorimeter onboard x-ray imaging and spectroscopy mission

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

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