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Estimation of Newtonian noise from KAGRA cooling system
Rishabh Bajpai, Takayuki Tomaru, Toshikazu Suzuki +3
KAGRA is the first km-scale gravitational wave detector to be constructed underground and employ cryogenics to cool down its test masses. While the underground location provides a…
A laser interferometer accelerometer for vibration sensitive cryogenic experiments
Rishabh Bajpai, Takayuki Tomaru, Kazuhiro Yamamoto +5
Monitoring motion originating from ultra low-temperature cooling systems like cryocoolers is important for vibration sensitive cryogenic experiments like KAGRA. Since no commercial…
Vibration Analysis of KAGRA Cryostat at Cryogenic Temperature
Rishabh Bajpai, Takayuki Tomaru, Nobuhiro Kimura +4
KAGRA uses cryogenics to cool its sapphire test masses down to 20 K to reduce the thermal noise. However, cryocooler vibration and structural resonances of the cryostat couple to t…
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…
An arm length stabilization system for KAGRA and future gravitational-wave detectors
T. Akutsu, M. Ando, K. Arai +198
Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities. Since achieving the resonances of the a…