Curriculum Vitaes
Profile Information
- Affiliation
- Institute of Space and Astronautical Science, Japan Aerospace Exploration AgencyGraduate School of Science Department of Astronomy, The University of Tokyo
- J-GLOBAL ID
- 200901049964309113
- researchmap Member ID
- 5000001980
- External link
Research Interests
5Research Areas
2Research History
1-
Oct, 2017 - Present
Major Papers
152-
Applied Optics, Aug 8, 2024
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Journal of Astronomical Telescopes, Instruments, and Systems, 9(02), Apr 19, 2023
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Journal of Astronomical Telescopes, Instruments, and Systems, 9(02), Apr 12, 2023
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Progress of Theoretical and Experimental Physics, 2023(4), Nov 21, 2022Abstract LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as a strategic large-class (L-class) mission, with an expected launch in the late 2020s using JAXA’s H3 rocket. LiteBIRD is planned to orbit the Sun–Earth Lagrangian point L2, where it will map the cosmic microwave background polarization over the entire sky for three years, with three telescopes in 15 frequency bands between 34 and 448 GHz, to achieve an unprecedented total sensitivity of $2.2\, \mu$K-arcmin, with a typical angular resolution of 0.5○ at 100 GHz. The primary scientific objective of LiteBIRD is to search for the signal from cosmic inflation, either making a discovery or ruling out well-motivated inflationary models. The measurements of LiteBIRD will also provide us with insight into the quantum nature of gravity and other new physics beyond the standard models of particle physics and cosmology. We provide an overview of the LiteBIRD project, including scientific objectives, mission and system requirements, operation concept, spacecraft and payload module design, expected scientific outcomes, potential design extensions, and synergies with other projects.
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Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, Aug 27, 2022
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Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, Aug 27, 2022
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SPACE TELESCOPES AND INSTRUMENTATION 2022: OPTICAL, INFRARED, AND MILLIMETER WAVE, 12180, 2022
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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-reviewed
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Journal of Astronomical Telescopes, Instruments, and Systems, 5(4), Oct 1, 2019 Peer-reviewed
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Proceedings of SPIE - The International Society for Optical Engineering, 10698, 2018 Peer-reviewed
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IEEE Transactions on Applied Superconductivity, 25(3), Jun 1, 2015 Peer-reviewed
Misc.
215-
日本物理学会講演概要集(CD-ROM), 79(2), 2024
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日本物理学会講演概要集(CD-ROM), 79(2), 2024
Presentations
78-
電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, Jan 23, 2014
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Technical report of IEICE. SCE, Jan 16, 2014Microwave Kinetic Inductance Detector (MKID) camera has been developed at National Astronomical Observatory of Japan for millimeter-wave and terahertz astronomy. MKID composed of superconducting resonators can sense a number of quasi-particles which incident photons above the gap energy generate by breaking Cooper pairs. A bi-layer MKID such as Al/Nb is attractive because the gap energy or the threshold frequency is easily changed due to proximity effect. It is quite useful for space observatory or a remote site such as the Antarctica where power consumption of cryocoolers is severely limited. We report high quality resonators of bi-layer (Al/Nb) MKIDs fabricated by liftoff technique. And we found temperature dependence of bi -layer MKID quality factor showed different behavior as Al or Nb monolayer.
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Technical report of IEICE. SCE, Jan 16, 2014We propose a hypothesis that there are a few numbers of quasiparticle states inside the energy gap and analyze the surface resistance and the Q-values of a resonator of superconductor using the hypothesis. The conventional Mattis-Bardeen theory is extended by introducing the complex number of the superconducting gap energy, which well predicts the magnitude of the quasiparticle density of states inside the energy gap. Using the extended Mattis-Bardeen theory, the surface resistance of superconductors and the Q-value of superconducting resonators are calculated. It is shown that simulated temperature dependence of the surface resistance and Q-value of a superconductor agree very well with the experimental results. It is also demonstrated that the calculated residual quasiparticle number of a superconducting resonator using the density of states, which is obtained from the fitting of a dc I-V curve of SIS tunnel junction, quantitatively agrees with the measured one.
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Proceedings of SPIE - The International Society for Optical Engineering, Jan 1, 2014© 2014 SPIE. We have been developing a lens-integrated superconducting camera for millimeter and submillimeter astronomy. High-purity silicon (Si) is suitable for the lens array of the Microwave Kinetic Inductance Detector (MKID) camera due to the high refractive index and the low dielectric loss at low temperature. The camera is antenna-coupled Al coplanar waveguides on a Si substrate. Thus the lens and the device are made of the same material. We report a fabrication method of 721 pixel Si lens array with anti-reflection coating. The Si lens array was fabricated with an ultra-precision cutting machine. It uses TiAlN coated carbide end mills attached with a high-speed spindle. The shape accuracy was less than 50 μm peak-to-valley and the surface roughness was Ra 1.8 μm. The mixed epoxy was used as anti-reflection coating to adjust the refractive index. It was shaved to make the thickness of 185 μm for 220 GHz. Narrow grooves were made between the lenses to prevent cracking due to different thermal expansion coefficients of Si and the epoxy. The surface roughness of the anti-reflection coating was Ra 2.4 ∼ 4.2 μm.
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日本物理学会講演概要集, Mar 5, 2012
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Technical report of IEICE. SANE, Jun 19, 2008The ALMA (Atacama Large Millimeter Submillimeter Array) is an international project by Europe, North America, and Japan, which is constructing large millimeter and submillimeter array at an altitude of 〜5000m on Atacama desert in northern Chile. The array consisted of 80 high surface accuracy antennae with 12m or 7m diameter extends 14km to achieve 0.01 arc second resolution. Atmospheric windows from 30GHz to 900GHz are covered by 10 frequency bands. We present submillimeter cartridge-type superconducting low noise receivers dictated for ultimate sensitivity. The sensitivity of ALMA is two orders of magnitude larger than those of existing millimeter arrays. The partial operation of ALMA will be started from 2010 and the full operation will be started from 2012.
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Technical report of IEICE. SANE, Jun 18, 2004The ALMA (Atacama Large Millimeter Submillimeter Array) is an international project by Europe, North America, and Japan, which is constructing large millimeter and submillimeter array at an altitude of 〜5000 m on Atacama desert in northern Chile. The array consisted of 80 high surface accuracy antennae with 12 m or 7 m diameter extends 14 km to achieve 0.01 arc second resolution. Atmospheric windows from 30 GHz to 900 GHz are covered by 10 frequency bands. We present ALMA instruments dictated for ultimate sensitivity, especially cartridge-type superconducting low noise receivers and photonic local oscillator system. The sensitivity of ALMA is two orders of magnitude larger than those of existing millimeter arrays. The partial operation of ALMA will be started from the end of 2007 and the full operation will be started from 2012.
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Proceedings of the IEICE General Conference, Mar 8, 2004
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Meeting abstracts of the Physical Society of Japan, Mar 3, 2004
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IEICE technical report. Antennas and propagation, Jan 16, 2004This paper aims to introduce a submillimeter-wave horn antenna designed by the authors which possesses high gain, very low loss and very low cross-polarisation within a very wide range of frequencies. It is a well-known fact that corrugated horn antennae radiate with symmetry pattern and very low cross-polarized field [1]. It is for this reason that corrugated horn antennae have chosen to design low loss horn antennae for radio-astronomical telescopes. However, the circular horn could not perform good just created corrugations inside of their flares [2]. Especially, it have been difficult to design the feed horns for radio-astronomical telescopes because they are required to possess very low loss. This paper presents a new submillimeter-wave corrugated horn antenna designed by the authors inserting an unique mode-transform section between a feed circular waveguide and a flare of a corrugated horn antenna.
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Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, Sep 20, 1993
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Abstracts of the meeting of the Physical Society of Japan. Annual meeting, Mar 16, 1993
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春の分科会講演予稿集, Mar 11, 1991
Teaching Experience
2-
Oct, 2022 - Jan, 2023High energy astrophysics (The University of Tokyo)
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Jul, 2020 - Aug, 2020Space astronomy (sokendai)
Research Projects
9-
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, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2021
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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, 2015 - Mar, 2020
Industrial Property Rights
3Social Activities
1● 指導学生等の数
1-
Fiscal Year2021年度(FY2021)Doctoral program1Master’s program1Internship students9
● 指導学生の表彰・受賞
1-
Student NameHayato TAKAKURAStudent affiliation東京大学AwardB-mode from spaceDate2019-12-5
● 専任大学名
1-
Affiliation (university)東京大学（University of Tokyo)
