Profile Information
- Affiliation
- Assistant Professor, Institute of Space and Astronautical Science, Department of Space Astronomy and Astrophysics, Japan Aerospace Exploration Agency
- Degree
- Ph. D(Jul, 2012, The University of Tokyo)
- Researcher number
- 20751176
- ORCID ID
https://orcid.org/0000-0002-5902-2672
- J-GLOBAL ID
- 201901005927826680
- researchmap Member ID
- B000348585
宇宙素粒子物理学が専門です。現在はCMB偏光観測を行う衛星実験LiteBIRDの研究開発をしています。
宇宙初期の物理学、特にインフレーションやダークマターなどに興味があります。
Research Interests
6Research History
5-
Apr, 2020 - May, 2020
-
Apr, 2017 - Mar, 2020
-
Apr, 2014 - Mar, 2017
Papers
55-
Journal of Cosmology and Astroparticle Physics, Dec 1, 2024<jats:title>Abstract</jats:title> <jats:p>Large angular scale surveys in the absence of atmosphere are essential for measuring the primordial B-mode power spectrum of the Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders of magnitude fainter than the temperature anisotropies of the CMB, in-flight calibration of the instruments and active suppression of systematic effects are crucial. We investigate the effect of changing the parameters of the scanning strategy on the in-flight calibration effectiveness, the suppression of the systematic effects themselves, and the ability to distinguish systematic effects by null-tests. Next-generation missions such as <jats:italic>LiteBIRD</jats:italic>, modulated by a Half-Wave Plate (HWP), will be able to observe polarisation using a single detector, eliminating the need to combine several detectors to measure polarisation, as done in many previous experiments and hence avoiding the consequent systematic effects. While the HWP is expected to suppress many systematic effects, some of them will remain. We use an analytical approach to comprehensively address the mitigation of these systematic effects and identify the characteristics of scanning strategies that are the most effective for implementing a variety of calibration strategies in the multi-dimensional space of common spacecraft scan parameters. We verify that <jats:italic>LiteBIRD</jats:italic>'s <jats:italic>standard configuration</jats:italic> yields good performance on the metrics we studied. We also present <jats:monospace>Falcons.jl</jats:monospace>, a fast spacecraft scanning simulator that we developed to investigate this scanning parameter space.</jats:p>
-
Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 82-82, Aug 23, 2024
-
Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 207-207, Aug 23, 2024
-
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, Aug 16, 2024
-
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 124-124, Aug 16, 2024
Misc.
50-
日本物理学会講演概要集(CD-ROM), 79(2), 2024
-
Ground test results of the electromagnetic interference for the x-ray microcalorimeter onboard XRISMSPACE TELESCOPES AND INSTRUMENTATION 2022: ULTRAVIOLET TO GAMMA RAY, 12181, Mar 2, 2023Electromagnetic 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 (XRISM), 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.
-
日本物理学会講演概要集(CD-ROM), 78(1), 2023
-
日本物理学会講演概要集(CD-ROM), 78(2), 2023
Major Presentations
92-
SPIE Astronomical Telescopes + Instrumentation, 2022, Jul, 2022
Research Projects
11-
科学研究費助成事業, 日本学術振興会, Apr, 2023 - Mar, 2028
-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2024 - Mar, 2027
-
科学研究費助成事業 挑戦的研究(萌芽), 日本学術振興会, Jul, 2020 - Mar, 2023
-
科学研究費助成事業 挑戦的研究(開拓), 日本学術振興会, Jun, 2019 - Mar, 2023
-
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Japan Society for the Promotion of Science, Jun, 2018 - Mar, 2023