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Identification of Noise-Associated Glitches in KAGRA O3GK with Hveto
T. Akutsu, M. Ando, M. Aoumi +148
Transient noise ("glitches") in gravitational wave detectors can mimic or obscure true signals, significantly reducing detection sensitivity. Identifying and excluding glitch-conta…
Control Scheme for Polarization Circulation Speed Meter Using a Dual-Retardation Waveplate
Yohei Nishino, Tomotada Akutsu, Yoichi Aso +1
In interferometric gravitational wave detectors, quantum radiation pressure noise, which is a back action of the measurement, will limit their sensitivities at low frequencies. Spe…
Input optics systems of the KAGRA detector during O3GK
T. Akutsu, M. Ando, K. Arai +246
KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with…
Overview of KAGRA : KAGRA science
KAGRA Collaboration, T. Akutsu, M. Ando +240
KAGRA is a newly build gravitational-wave observatory, a laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper in the series of KAGRA-featured a…
KAGRA: 2.5 Generation Interferometric Gravitational Wave Detector
T. Akutsu, M. Ando, K. Arai +188
The recent detections of gravitational waves (GWs) reported by LIGO/Virgo collaborations have made significant impact on physics and astronomy. A global network of GW detectors wil…
Molecular adsorbed layer formation on cooled mirrors and its impacts on cryogenic gravitational wave telescopes
Kunihiko Hasegawa, Tomotada Akutsu, Nobuhiro Kimura +5
Cryogenic mirrors have been introduced to the KAGRA gravitational wave telescope in Japan, and are also planned to be used in next-generation gravitational wave telescopes to furth…
Construction of KAGRA: an Underground Gravitational Wave Observatory
T. Akutsu, M. Ando, S. Araki +222
Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km detector is installed underground in a m…
The status of KAGRA underground cryogenic gravitational wave telescope
KAGRA Collaboration, T. Akutsu, M. Ando +146
KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to…
Current status of the CLIO project
K Yamamoto, T Uchiyama, S Miyoki +27
CLIO (Cryogenic Laser Interferometer Observatory) is a Japanese gravitational wave detector project. One of the main purposes of CLIO is to demonstrate thermal-noise suppression by…
Current status of Japanese detectors
Daisuke Tatsumi, Ryutaro Takahashi, Koji Arai +29
Current status of TAMA and CLIO detectors in Japan is reported in this article. These two interferometric gravitational-wave detectors are being developed for the large cryogenic g…
Measurement of the mechanical loss of a cooled reflective coating for gravitational wave detection
Kazuhiro Yamamoto, Shinji Miyoki, Takashi Uchiyama +13
We have measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam sputtered SiO and TaO) in cooled mirrors. The loss was nearly independent o…
Thermal lensing in cryogenic sapphire substrates
Takayuki Tomaru, Toshikazu Suzuki, Shinji Miyoki +6
We report the reduction of the thermal lensing in cryogenic sapphire mirrors, which is planed to be used in the Large scale Cryogenic Gravitational wave Telescope (LCGT) project. W…
Mechanical quality factor of a sapphire fiber at cryogenic temperatures
T. Uchiyama, T. Tomaru, D. Tatsumi +6
A mechanical quality factor of was obtained for the 199 Hz bending vibrational mode in a monocrystalline sapphire fiber at 6 K. Consequently, we confirm that pe…