A5000586978- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Physics of Superconductivity and Magnetism
- Cosmology and Gravitation Theories
- Radio Frequency Integrated Circuit Design
- Precipitation Measurement and Analysis
- Geophysics and Gravity Measurements
- Superconductivity in MgB2 and Alloys
- Quantum and electron transport phenomena
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Advanced Thermodynamics and Statistical Mechanics
- Adaptive optics and wavefront sensing
- Inertial Sensor and Navigation
- Dark Matter and Cosmic Phenomena
- Microwave Engineering and Waveguides
- Spacecraft Design and Technology
- Gyrotron and Vacuum Electronics Research
- Calibration and Measurement Techniques
- Acoustic Wave Resonator Technologies
- Solar and Space Plasma Dynamics
- Advanced Semiconductor Detectors and Materials
- Particle Detector Development and Performance
Tohoku University
2016-2024
RIKEN Center for Quantum Computing
2022
RIKEN Center for Advanced Photonics
2019-2022
RIKEN
2021
Nitto RIKEN (Japan)
2020
Kyoto University
2019
Saitama University
2019
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...
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,...
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...
The cutting-edge superconducting detector, Microwave Kinetic Inductance Detector（MKID） has been popular in the field of astronomical radio observations such as Cosmic Background（CMB）, star-forming regions, and galaxy surveying. MKID is a resonator-based detector which scalability to exceed O（1,000） pixels one readout line. photon-noise-limited sensitivity can be achieved with hybrid-type consists two materials. arrays are utilized “GroundBIRD” “Tsukuba-KID camera” projects led by Japanese...
GroundBIRD is a ground-based cosmic microwave background (CMB) experiment for observing the polarization pattern imprinted on large angular scales (ℓ > 6 ) from Teide Observatory in Tenerife, Spain. Our primary scientific objective precise measurement of optical depth τ (σ(τ ∼ 0.01) to reionization epoch Universe cross-check systematic effects measurements made by previous experiments. observes wide sky area Northern Hemisphere (∼ 40% full sky) while continuously rotating telescope at high...
Polarized patterns in the cosmic microwave background (CMB) radiation contains rich knowledge for early stage of universe. In particular their odd-parity at large angular scale (> 1°), primordial B-modes, are smoking-gun evidence inflation. The GroundBIRD experiment aims to detect these B-modes with a ground-based apparatus that includes several novel devices: high-speed rotational scan system, cold optics, and kinetic inductance detectors (MKIDs). We plan start observations Canary Islands...
A microwave kinetic inductance detector (MKID) is a cutting-edge superconducting detector, and its principle based on resonator circuit. The transition temperature (Tc) of the MKID an important parameter because various characterization parameters depend it. In this paper, we propose method to measure Tc by changing applied power readout microwaves. small fraction deposited MKID, number quasiparticles in increases with power. Furthermore, quasiparticle lifetime decreases quasiparticles....
Our understanding of physics at very early Universe, as 10 −35 s after the Big Bang, relies on scenario known inflationary cosmology. Inflation predicts a particular polarization pattern in cosmic microwave background, B -mode yet strength such is extremely weak. To search for we are constructing an off-axis rotating telescope to mitigate systematic effects well maximize sky coverage observation. We will discuss present status GroundBIRD telescope.
The cosmic microwave background (CMB) radiation is an afterglow of the Big Bang. It contains crucial keys to understand beginning universe. In particular, odd-parity patterns CMB polarization, B-modes, at more than degree-scale, are best probe detect primordial gravitational waves inflation. GroundBIRD experiment aims this large angular scale from ground. employs novel techniques; a high-speed rotational scanning system (20 revolution-per-minutes) with cold optics below 4K, and kinetic...
Superconducting detectors are a modern technology applied in various fields. The microwave kinetic inductance detector (MKID) is one of the cutting-edge superconducting detectors. It based on principle resonator circuit. A radiation entering MKID breaks Cooper pairs resonator, and intensity detected as variation resonant condition. Therefore, calibration responsivity, i.e., phase with respect to number Cooper-pair (quasiparticles), important. We propose method for responsivity calibration....
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 ($\ang{;30}$) 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...
A microwave kinetic inductance detector (MKID) is a cutting-edge superconducting detector, and its principle based on resonator circuit. The transition temperature (Tc) of the MKID an important parameter because various characterization parameters depend it. In this paper, we propose method to measure Tc by changing applied power readout microwaves. small fraction deposited in MKID, number quasiparticles increases with power. Furthermore, quasiparticle lifetime decreases quasiparticles....