A5027188146- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Physics of Superconductivity and Magnetism
- Dark Matter and Cosmic Phenomena
- Radio Frequency Integrated Circuit Design
- Electromagnetic Compatibility and Measurements
- Superconducting Materials and Applications
- Galaxies: Formation, Evolution, Phenomena
- Fusion materials and technologies
- Adaptive optics and wavefront sensing
- Magnetic confinement fusion research
- Advanced Thermodynamic Systems and Engines
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Antenna Design and Optimization
- Neutrino Physics Research
- Particle Detector Development and Performance
- Advanced Antenna and Metasurface Technologies
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Spacecraft Design and Technology
- Spacecraft and Cryogenic Technologies
- Thermal Radiation and Cooling Technologies
Japan Aerospace Exploration Agency
2020-2024
Institute of Space and Astronautical Science
2020-2024
University of Tsukuba
2024
Tohoku University
2019-2024
Sorbonne Université
2024
European Space Astronomy Centre
2024
École Normale Supérieure
2024
Université Paris Cité
2024
University of California, San Diego
2024
The University of Tokyo
2010-2023
We observed three γ-ray bursts related to thunderclouds in winter using the prototype of anti-neutrino detector PANDA made 360-kg plastic scintillator deployed at Ohi Power Station coastal area Japan Sea. The maximum rate events which deposited energy higher than 3 MeV was (5.5±0.1)×102/s. Monte Carlo simulation showed that electrons with approximately monochromatic falling downwards from altitudes order 100 m roughly produced total spectra bursts. It is supposed secondary cosmic-ray...
LiteBIRD is a next generation satellite aiming for the detection of Cosmic Microwave Background (CMB) B-mode polarization imprinted by primordial gravitational waves generated in era inflationary universe. The science goal to measure tensor-to-scaler ratio r with precision δr < 10<sup>-3</sup>♦, offering us crucial test major large-single-field slow-roll inflation models. planned conduct an all sky survey at sun-earth second Lagrange point (L2) angular resolution about 0.5...
In the field of radiowave detection, enlarging receiver aperture to enhance amount light detected is essential for greater scientific achievements. One challenge in using radio transmittable apertures keeping detectors cool. This because transparency thermal radiation above frequency range increases load. shielding from radiation, a general strategy install filters path between and detectors. However, there difficulty fabricating metal mesh large diameters. It also difficult maintain...
We present the mission design of LiteBIRD, a next generation satellite for study B-mode polarization and inflation from cosmic microwave background radiation (CMB) detection. The science goal LiteBIRD is to measure CMB with sensitivity δr = 0:001, this allows testing major single-field slow-roll models experimentally. instrumental purely driven achieve goal. At earlier stage design, several key specifications, e.g. observing band, optical system, scan strategy, orbit, need be defined in...
Suppression of straylight is one the challenges in optical design a wide-field-of-view telescope. It contaminates weak target signal with radiation from strong sources at angles far observing direction. We evaluated crossed-Dragone telescope, LiteBIRD Low-Frequency Telescope (LFT), which has 18° ×9° field view. measured 1/4-scaled antenna LFT accordingly scaled frequencies 160–200 GHz (corresponding to 40–50 for full-scale LFT), feed center and edges focal plane. To separate components, we...
Abstract Understanding telescope pointing (i.e. line of sight) is important for observing the cosmic microwave background (CMB) and astronomical objects. The Moon a candidate source calibration. Although visible size (30′) larger than that planets, we can frequently observe once month with high signal-to-noise ratio. We developed method performing calibration using observational data from Moon. considered tilts axes as well encoder collimation offsets In addition, evaluated effects...
Mitigating the far sidelobes of a wide-field-of-view telescope is one critical issues for polarization observation cosmic microwave background. Since even small reflections stray light at millimeter-wave absorbers inside may create nonnegligible sidelobes, we have developed method to measure reflectance absorbers, including diffuse reflections. By applying planar near-field measurement enabled two-dimensional diffuse-reflection measurements, in addition characterizing specular reflection. We...
LiteBIRD is a JAXA-led international project aimed to make high sensitivity measurements of the primordial B modes through cosmic microwave background (CMB) polarization observations. The Low-Frequency Telescope (LFT) modified crossed Dragone reflective telescope with 18° × 9° field-of-view across 34-161 GHz. To achieve required observational sensitivity, telescope's sidelobe response must be characterized precision minimize signal contamination systematic effects from galactic...
A precise measurement of Cosmic Microwave Background (CMB) provides us rich information about the universe. In particular, its asymmetric polarization patterns, B-modes, are smoking gun signature inflationary Magnitude B-modes is order 10 nK. Its requires a high sensitive millimeter-wave telescope with large number superconducting detectors on focal plane. Kinetic Inductance Detector (MKID) appropriate detector for this purpose. MKID camera has been developed in cooperation National...
We developed a system that continuously maintains cryocooler for long periods on rotating table. A cryostat holds the is set compressor located ground and supplies high-purity (&gt;99.999%) high-pressure (1.7 MPa) helium gas electricity to cryocooler. The operation of other instruments requires development interface components between combination access holes at center table two rotary joints allows simultaneous circulation gas. provides innovative functions under condition, cooling from...
Abstract We compute the expected sensitivity on measurements of optical depth to reionization for a ground-based experiment at Teide Observatory. simulate polarized partial sky maps GroundBIRD frequencies 145 and 220 GHz. perform fits simulated with our pixel-based likelihood extract reionization. The noise levels polarization are estimated as 110 <?CDATA $\mu {\rm{K}}\,\mathrm{arcmin}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>μ</mml:mi> <mml:mi...
A microwave kinetic inductance detector (MKID) is a cutting-edge superconducting detector. It comprises resonator circuit constructed with film on dielectric substrate. To expand its field of application, it important to establish method suppress the two-level system (TLS) noise that caused by electric fluctuations between two energy states at surface The density can be decreased expanding strip width (S) and gap from ground plane (W) in MKID circuit, allowing suppression TLS noise. However,...