Eiichi Hirose
A5051191621- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Optical Systems and Laser Technology
- High-pressure geophysics and materials
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Optical measurement and interference techniques
- Atomic and Subatomic Physics Research
- Surface Roughness and Optical Measurements
- Cosmology and Gravitation Theories
- Bone Tissue Engineering Materials
- Dental Implant Techniques and Outcomes
- Blind Source Separation Techniques
- Advanced MEMS and NEMS Technologies
- 3D IC and TSV technologies
- Solid State Laser Technologies
- Human Motion and Animation
- Advanced Vision and Imaging
inhbar, Inc. (Japan)
2020-2024
The University of Tokyo
2014-2023
Kavli Institute for the Physics and Mathematics of the Universe
2019-2023
National Astronomical Observatory of Japan
2020
Tokyo Institute of Technology
2019
Institute for Cosmic Ray Research
2014
Syracuse University
2010
Osaka University
1998
Abstract KAGRA is a newly built gravitational-wave telescope, laser interferometer comprising arms with length of 3 km, located in Kamioka, Gifu, Japan. was constructed under the ground and it operated using cryogenic mirrors that help reducing seismic thermal noise. Both technologies are expected to provide directions for future telescopes. In 2019, finished all installations designed configuration, which we call baseline KAGRA. For this occasion, present an overview from various viewpoints...
KAGRA is a newly built gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this series of articles, we present an overview the baseline KAGRA, for which finished installing designed configuration 2019. This article describes method calibration (CAL) used reconstructing signals from detector outputs, as well characterization (DET). We also review physical environmental monitors (PEM) system and geophysics (GIF). Both are...
Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km is installed underground in mine order to be isolated from background seismic vibrations on the surface. This allows us achieve good sensitivity at low frequencies high stability detector. Bare-bones equipment for interferometer first test run was accomplished March April 2016 with rather simple configuration. initial configuration named {\it iKAGRA}. In...
Abstract KAGRA is a newly build gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper, one of series articles featuring KAGRA, we discuss the science targets projects, considering not only baseline (current design) but also its future upgrade candidates (KAGRA+) for near to middle term ($\sim$5 years).
KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It now its final installation phase, which we call bKAGRA (baseline KAGRA), scientific observations expected to begin late 2019. One of the advantages underground location least 200 m below ground surface, brings small seismic motion low frequencies and high stability detector. Another advantage that it cools down sapphire test mass mirrors cryogenic temperatures...
KAGRA, the Japanese interferometric gravitational wave detector currently under construction, will employ sapphire test masses for its cryogenic operation. Sapphire has an advantage in higher thermal conductivity near operating temperature 20 K compared to fused silica used other detectors, but there are some uncertain properties application such as hardness, optical absorption, and birefringence. We introduce design of our recent R results address above properties. Test polish substrate...
We observed the effect of radiation pressure on angular sensing and control system Laser Interferometer Gravitational-Wave Observatory (LIGO) interferometer's core optics at LIGO Hanford Observatory. This is first measurement this in a complete gravitational-wave interferometer. Only one two modes survives with feedback control, because other mode suppressed when gain sufficiently large. developed mathematical model to understand physics system. matches well dynamics that we observe.
Upgrades to improve the sensitivity of gravitational wave detectors enable more frequent detections and precise source parameter estimation. Unlike other advanced interferometric such as Advanced LIGO Virgo, KAGRA requires a different approach for upgrade since it is only detector which employs cryogenic cooling test masses. In this paper, we describe possible upgrades with technologies focusing on bands compare impacts detection compact binary coalescences. We show that either fivefold...
We report the results of a new experimental setup to measure mechanical loss coating layers on thin sapphire disk at cryogenic temperatures. Some authors previously reported that there was no temperature dependence from multilayer tantala/silica disk, both before and after heat treatment, although some reports indicate ${\mathrm{Ta}}_{2}{\mathrm{O}}_{5}$ ${\mathrm{SiO}}_{2}$ annealed $600\text{ }\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ have peaks near 20 K. Since KAGRA---the Japanese...
We report the characterization of superlow-loss optics used in second-generation gravitational-wave detectors currently operation. The sapphire test-mass mirrors KAGRA detector are introduced as an example, but techniques here common to all detectors. In this work, we discuss mainly surface topography obtained by interferometric and optical properties with special setups.
We describe the recent development of cryogenic sapphire mirrors and their seismic attenuation system (SAS) for KAGRA gravitational wave detector. briefly outline current R&D status mirror development. The SAS is under development, we report concept suspension, predict performance based on a mathematical model with without feedback control.
Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities.Since achieving the resonances of arm cavities is most challenging among lock acquisition processes, scheme called length stabilization (ALS) had been employed for cavities.We designed new type ALS, which compatible interferometers having long arms like next generation GW detectors.The features ALS are that control simpler than those previous ones and it...
KAGRA is a new gravitational wave detector which aims to begin joint observation with Advanced LIGO and Virgo from late 2019. Here, we present KAGRA's possible upgrade plans improve the sensitivity in decade ahead. Unlike other state-of-the-art detectors, requires different investigations for since it only employs cryogenic cooling of test mass mirrors. In this paper, on can be realized by changing input laser power, increasing mirror mass, injecting frequency dependent squeezed vacuum are...
The construction of a large-scale cryogenic gravitational wave telescope, KAGRA, has been completed, and four sapphire test masses have installed in cryostat vacuum chambers. Recently, it was observed that substrate used for one the input showed characteristic structure its transmission map due to nonuniformity crystal. We performed an interferometer simulation observe influence using measured transmission/reflection maps. Shot noise increased by 7% at low frequencies 16% high frequencies....
Abstract KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine Japan. It first km-class constructed underground to reduce seismic noise, and use cryogenic cooling of test masses thermal noise. The construction infrastructure house interferometer tunnel, initial phase operation with simple Michelson configuration have been completed. expected 2018, observing runs full are 2020s. basic current status described.
Cooling down test masses to cryogenic temperatures is a way reduce the thermal noise of gravitational wave detectors. Crystalline materials are considered most promising for fabricating and their coatings because excellent optical properties at low temperatures. However, birefringence owing local impurities inhomogeneities in crystal can degrade performance detector. The measurement or mapping over two-dimensional area thus important. This study describes method fast measurements large...
Scattered light in inteferometric gravitational wave detectors needs to be reduced so that it will not harm the actual signals coming from a wave. In this paper, we report on application of theory scattering mirrors interferometric having multilayer coatings their surfaces and compared results with single-surface theories, which are traditionally used field detectors. For first time field, have calculated distributions power-recycling, signal-recycling, beam-splitter KAGRA (a cryogenic...
A vibration isolation system called the Type-Bp used for power recycling mirrors has been developed KAGRA, interferometric gravitational-wave observatory in Japan. suspension of passively isolates an optic from seismic using three main pendulum stages equipped with two vertical systems. compact reaction mass around each allows achieving sufficient damping performance a simple feedback as well ratio. Three systems were installed and proved to satisfy requirements on performance, also...
KAGRA is a 3-km cryogenic interferometric gravitational wave telescope located at an underground site in Japan. In order to achieve its target sensitivity, the relative positions of mirrors interferometer must be finely adjusted with attached actuators. We have developed model simulate length control loops realistic suspension responses and various noises for mirror actuation. Using our model, we designed actuation parameters sufficient force range acquire lock as well all degrees freedom...
We apply the independent component analysis (ICA) to real data from a gravitational wave detector for first time. Specifically we use iKAGRA taken in April 2016, and calculate correlations between strain channel 35 physical environmental channels. Using couple of seismic channels which are found be strongly correlated with strain, perform ICA. Injecting sinusoidal continuous signal channel, find that ICA recovers correct parameters enhanced signal-to-noise ratio, demonstrates usefulness this...
Abstract KAGRA is an underground interferometric gravitational wave detector which currently being commissioned. This relies on high-performance vibration-isolation systems to suspend its key optical components. These suspensions come in four different configurations, of the type-B used for beam splitter and signal recycling mirrors. The suspension comprises payload, three geometric anti-spring filters vertical isolation one inverted pendulum horizontal isolation. payload optic, marionette...
Cooling down test masses to cryogenic temperatures is a way reduce the thermal noise of gravitational wave detectors. Crystalline materials are considered most promising for fabricating and their coatings because excellent optical properties at low temperatures. However, birefringence owing local impurities inhomogeneities in crystal can degrade performance detector. The measurement or mapping over two-dimensional area thus important. This study describes method fast measurements large...
Abstract Recent progress in materials chemistry has resulted the development of several ceramic that are now being used dental implants. The advantages over conventional metallic they do not induce allergic reactions individuals with metal allergies, interfere magnetic resonance imaging, and provide improved esthetics. In addition, some tougher than less brittle. However, despite these advantages, few implant currently approved for use Japan. FY2022, Ministry Health, Labour Welfare Japan...