Publications (15)
Cryogenic suspension design for a kilometer-scale gravitational-wave detector
Takafumi Ushiba, Tomotada Akutsu, Yoichi Aso +43
We report the mirror suspension design for Large-scale Cryogenic Gravitational wave Telescope, KAGRA, during bKAGRA Phase 1. Mirror thermal noise is one of the fundamental noises f…
Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses
Masaki Ando, Koji Arai, Youichi Aso +19
We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses fo…
Thermal-noise-limited underground interferometer CLIO
Kazuhiro Agatsuma, Koji Arai, Masa-Katsu Fujimoto +12
We report on the current status of CLIO (Cryogenic Laser Interferometer Observatory), which is a prototype interferometer for LCGT (Large Scale Cryogenic Gravitational-Wave Telesco…
TOrsion-Bar Antenna: A Ground-Based Detector for Low-Frequency Gravity Gradient Measurement
Satoru Takano, Tomofumi Shimoda, Yuka Oshima +12
The Torsion-Bar Antenna (TOBA) is a torsion pendulum-based gravitational detector developed to observe gravitational waves in frequencies between 1 mHz and 10 Hz. The low resonant…
Reduction of thermal fluctuations in a cryogenic laser interferometric gravitational wave detector
Takashi Uchiyama, Shinji Miyoki, Souichi Telada +14
The thermal fluctuation of mirror surfaces is the fundamental limitation for interferometric gravitational wave (GW) detectors. Here, we experimentally demonstrate for the first ti…
Direct Measurement of Thermal Fluctuation of High-Q Pendulum
Kazuhiro Agatsuma, Takashi Uchiyama, Kazuhiro Yamamoto +6
We achieved for the first time a direct measurement of the thermal fluctuation of a pendulum in an off-resonant region using a laser interferometric gravitational wave detector. Th…
Effect of energy deposited by cosmic-ray particles on interferometric gravitational wave detectors
Kazuhiro Yamamoto, Hideaki Hayakawa, Atsushi Okada +7
We investigated the noise of interferometric gravitational wave detectors due to heat energy deposited by cosmic-ray particles. We derived a general formula that describes the resp…
Cryogenic measurement of the optical absorption coefficient in sapphire crystals at 1.064(micro)m for the Large-scale Cryogenic Gravitational wave Telescope
Takayuki Tomaru, Takashi Uchiyama, Daisuke Tatsumi +6
We have applied laser calorimetry to the measurement of optical absorption in mono-crystalline sapphire at cryogenic temperatures. Sapphire is a promising candidate for the mirror…
Statistical Estimation and Correction of Model-Measurement Bias in Time-Dependent Correction Factors of KAGRA
Shingo Hido, Takahiro Yamamoto, Dan Chen +2
Calibration of gravitational-wave detectors reconstructs the strain h(t) from the detector output, and bias and uncertainty in this reconstruction directly affect downstream analys…
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…
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…
Statistical-Uncertainty-Driven Selection of Evaluation Frequency for Time-Dependent Sensing Calibration: A Demonstration with KAGRA Data
Shingo Hido, Takahiro Yamamoto, Dan Chen +2
Accurate calibration of the gravitational-wave strain h(t) is essential for both detection and astrophysical inference. In operating detectors, slow temporal variations in the sens…
Conduction Effect of Thermal Radiation in a Metal Shield Pipe in a Cryostat for a Cryogenic Interferometric Gravitational Wave Detector
Takayuki Tomaru, Masao Tokunari, Kazuaki Kuroda +13
A large heat load caused by thermal radiation through a metal shield pipe was observed in a cooling test of a cryostat for a prototype of a cryogenic interferometric gravitational…
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…
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…