Active damping performance of the KAGRA seismic attenuation system prototype

11th Edoardo Amaldi Conference on Gravitational Waves

Fujii, Yoshinori^1 ; Sekiguchi, Takanori^2 ; Takahashi, Ryutaro^3 ; Aso, Yoichi^3 ; Barton, Mark^3 ; Arellano, Fabián Erasmo Pena^3 ; Shoda, Ayaka^3 ; Akutsu, Tomotada^3 ; Miyakawa, Osamu^2 ; Kamiizumi, Masahiro^2 ; Ishizaki, Hideharu^3 ; Tatsumi, Daisuke^3 ; Hirata, Naoatsu^3 ; Hayama, Kazuhiro^4 ; Okutomi, Koki^3 ; Miyamoto, Takahiro^2 ; Ishizuka, Hideki^2 ; Desalvo, Riccardo^5 ; Flaminio, Raffaele^3

Department of Astronomy, University of Tokyo, Bunkyo, Tokyo

113-0033, Japan^1

Institute for Cosmic Ray Research, Kashiwanoha, Kashiwa-shi, Chiba

277-8582, Japan^2

National Astronomical Obsevatory of Japan, Osawa, Mitaka-shi, Tokyo

181-8588, Japan^3

Osaka City University, Sumiyoshi-ku Sugimoto, Osaka-shi, Osaka

558-8585, Japan^4

University of Sannio, Corso Garibaldi 107, Benevento

82100, Italy^5

关键词: Frequency response tests;    Lock acquisition;    Long term stability;    Mechanical resonance;    Seismic attenuation;    Signal recycling;    System prototype;    Vibration isolations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/716/1/012022/pdf
DOI  :  10.1088/1742-6596/716/1/012022

来源: IOP

【 摘 要 】

The Large-scale Cryogenic Gravitational wave Telescope (formerly LCGT now KAGRA) is presently under construction in Japan. This May we assembled a prototype of the seismic attenuation system (SAS) for the beam splitter and the signal recycling mirrors of KAGRA, which we call Type-B SAS, and evaluated its performance at NAOJ (Mitaka, Toyko). We investigated its frequency response, active damping performance, vibration isolation performance and long-term stability both in and out of vacuum. From the frequency response test and the active damping performance test, we confirmed that the SAS worked as we designed and that all mechanical resonances which could disturb lock acquisition and observation are damped within 1 minute, which is required for KAGRA, by the active controls.