Curriculum Vitaes
Profile Information
- Affiliation
- Aerospace Project Research Associate, Department of Space Astronomy and Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Degree
- Doctor of Philosophy(Mar, 2023, The University of Tokyo)
- Researcher number
- 10980948
- ORCID ID
https://orcid.org/0000-0001-9823-1920- J-GLOBAL ID
- 202001020525555639
- researchmap Member ID
- R000014175
Research History
2Papers
25-
Applied Optics, 64(14) 4050-4050, May 8, 2025 Peer-reviewedLiteBIRD is a JAXA-led international project aimed at measuring the cosmic microwave background (CMB) polarization with high sensitivity to detect polarization B modes. This detection would provide evidence of inflation. LiteBIRD will observe the full sky for three years at the L2 Lagrange point of the Earth–Sun system across 34–448 GHz and is expected to launch in the Japanese fiscal year of 2032. The Low-Frequency Telescope (LFT) will observe in the 34–161 GHz range implementing a modified crossed Dragone (MCD) reflective optical design optimized for high optical performance across a wide 18∘×9∘ field of view (FOV). In this paper, we report the LFT optical design details including its optimization and optical performance assessed using optical simulations. The MCD design consists of a paraboloidal primary and a hyperboloidal secondary reflector with polynomial correction terms up to seventh order, achieving Strehl ratios ≥0.97 at 161 GHz across the FOV. The Mueller QU (UQ) cross-polarization response is ≤−26.9dB at 34 GHz. The simulated beam sizes are <78′ at 34 GHz. The simulated sidelobe response for the direct and diffuse triple reflection sidelobes is estimated to be <−57dB and for the focused triple reflection sidelobe <−37dB at 34 GHz. The LFT optical design satisfies all the optical requirements and specifications for the project and is compatible with the LiteBIRD science goals.
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Journal of Cosmology and Astroparticle Physics, 2024(12) 036-036, Dec 1, 2024 Peer-reviewedAbstract 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 LiteBIRD, 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 LiteBIRD's standard configuration yields good performance on the metrics we studied. We also present Falcons.jl, a fast spacecraft scanning simulator that we developed to investigate this scanning parameter space.
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Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 209-209, Aug 23, 2024
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Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 82-82, Aug 23, 2024
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Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 207-207, Aug 23, 2024 Lead author
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Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 124-124, Aug 16, 2024
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Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 120-120, Aug 16, 2024
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Applied Optics, Aug 8, 2024 Peer-reviewed
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Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 13092, 2024
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ASTRONOMY & ASTROPHYSICS, 676, Aug, 2023 Peer-reviewed
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Journal of Astronomical Telescopes, Instruments, and Systems, 9(02), Apr 19, 2023 Peer-reviewed
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Journal of Astronomical Telescopes, Instruments, and Systems, 9(02), Apr 12, 2023 Peer-reviewedLead author
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Journal of Low Temperature Physics, 211(5-6) 384-397, Dec 2, 2022 Peer-reviewed
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Progress of Theoretical and Experimental Physics, 2023(4), Nov 21, 2022 Peer-reviewed
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Journal of Low Temperature Physics, 209(3-4) 396-408, Sep 5, 2022 Peer-reviewed
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Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 12180, Aug 27, 2022 Lead author
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Journal of Cosmology and Astroparticle Physics, 2022(4), Apr, 2022 Peer-reviewed
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Journal of Low Temperature Physics, 199(3-4) 1107-1117, May 1, 2020 Peer-reviewed
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Journal of Low Temperature Physics, 199(1-2) 339-347, Apr, 2020 Peer-reviewed
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Proceedings of SPIE - The International Society for Optical Engineering, 11443, 2020
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Proceedings of SPIE - The International Society for Optical Engineering, 11443, 2020
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Proceedings of SPIE - The International Society for Optical Engineering, 11453, 2020
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Proceedings of SPIE - The International Society for Optical Engineering, 11453, 2020
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IEEE Transactions on Terahertz Science and Technology, 9(6) 598-605, Nov, 2019 Peer-reviewedLead author
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Proceedings of SPIE - The International Society for Optical Engineering, 10698, 2018
Major Misc.
12Major Presentations
10-
CMB B-mode - NEXT, Jan 29, 2025 Invited
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CMB-CAL 2024 @Bicocca, Nov 6, 2024 Invited
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2022 URSI-Japan Radio Science Meeting, Sep 2, 2022
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SPIE Astronomical Telescopes + Instrumentation 2022, Jul 18, 2022
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SPIE Astronomical Telescopes + Instrumentation 2020, Dec 14, 2020
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CMB Systematics and Calibration Focus Workshop, Dec 2, 2020 Invited
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30th International Symposium on Space Terahertz Technology, Apr 15, 2019
Research Projects
3-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2024 - Mar, 2028
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Jun, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2023