A5102791993- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Radio Frequency Integrated Circuit Design
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Superconductivity in MgB2 and Alloys
- Quantum Chromodynamics and Particle Interactions
- Radiation Detection and Scintillator Technologies
- Advanced Frequency and Time Standards
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Thermal Radiation and Cooling Technologies
- Astronomical Observations and Instrumentation
- Gyrotron and Vacuum Electronics Research
- Precipitation Measurement and Analysis
- Adaptive optics and wavefront sensing
- Endoplasmic Reticulum Stress and Disease
Tohoku University
2014-2024
Instituto de Astrofísica de Canarias
2024
RIKEN Center for Advanced Photonics
2015-2023
National Institute of Information and Communications Technology
2022-2023
RIKEN
2013-2021
Okayama University
1999-2020
Nitto RIKEN (Japan)
2016-2020
Saitama University
2019
Kyoto University
2019
Nippon Soken (Japan)
2015-2018
LiteBIRD [Lite (Light) satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection] is a small to map microwave (CMB) radiation over full sky at large angular scales with unprecedented precision. Cosmological inflation, which leading hypothesis resolve problems in Big Bang theory, predicts that primordial gravitational waves were created during inflationary era. Measurements CMB are known as best probe detect waves. The working group authorized...
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...
Non-steroidal anti-inflammatory drugs (NSAIDs) show chemopreventive effects; however, the precise molecular mechanism of these effects is still unclear. On other hand, expression proteins that form tight junctions (TJs) (such as claudins) in clinically isolated tumors frequently altered relative to normal tissue. We previously reported NSAIDs upregulate claudin-4 and this upregulation contributes NSAID-dependent inhibition both migration activity anchorage-independent growth cancer cells. In...
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...
We report superconducting nanostrip single-photon detectors (SNSPDs) with dielectric multilayer cavities (DMCs) for a 2-µm wavelength. designed DMC composed of periodic SiO2/Si bilayers. Simulation results finite element analysis showed that the optical absorptance NbTiN nanostrips on exceeded 95% at 2 µm. fabricated SNSPDs an active area 30 µm × µm, which was sufficiently large to couple single-mode fiber The were evaluated using sorption-based cryocooler controlled temperature. carefully...
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 have prepared superconducting resonators using high-quality Nb thin films with RRR = 48 and studied their resonance characteristics in detail. It was observed that the measured internal quality factor Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</sub> reached as high 4×10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> , which might be highest value obtained among film ever reported. is demonstrated temperature dependence of...
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,...
GroundBIRD is a millimeter-wave telescope to observe the polarization patterns of cosmic microwave background (CMB). The target science topics are primordial gravitational waves from inflation and reionization optical depth. Therefore, this designed achieve highest sensitivity at large angular scales, ℓ = 6 - 300. For wide sky observations (~40% full-sky), scanning high rotation speed (120°/s) important remove atmospheric fluctuations. Microwave kinetic inductance detector (MKID) utilized...
We present our recent development of superconducting detectors for measurements cosmic microwave background. have fabricated antenna-coupled tunnel junctions (STJs). Two different types STJs been fabricated: the parallel-connected twin junction and microstrip. Both made Nb Al successfully detected 80 GHz millimeter wave radiation with photon-assisted tunneling. also developed kinetic inductance (MKIDs). The MKIDs offer us high multiplexing factors a single readout line using frequency-domain...
Microwave kinetic inductance detectors (MKIDs) are promising for THz direct detector arrays of large size, particularly with simple frequency-division multiplexing. Purple Mountain Observatory is developing a terahertz superconducting imaging array (TeSIA) the DATE5 telescope to be constructed at Dome A, Antarctica. Here we report on development prototype TeSIA, namely an $$8\times 8$$ CPW MKID 0.35 THz. The resonance frequencies MKIDs span 4–5.575 GHz band interval 25 MHz. Each integrated...