Characterization of the room temperature payload prototype for the cryogenic interferometric gravitational wave detector KAGRA

KAGRA is a cryogenic interferometric gravitational wave detector currently under construction in the Kamioka mine in Japan. Besides the cryogenic test masses, KAGRA will also rely on room temperature optics which will hang at the bottom of vibration isolation chains. The payload of each chain compri...

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Bibliographic Details
Published in:Review of scientific instruments 2016-03, Vol.87 (3), p.034501-034501
Main Authors: Peña Arellano, Fabián Erasmo, Sekiguchi, Takanori, Fujii, Yoshinori, Takahashi, Ryutaro, Barton, Mark, Hirata, Naoatsu, Shoda, Ayaka, van Heijningen, Joris, Flaminio, Raffaele, DeSalvo, Riccardo, Okutumi, Koki, Akutsu, Tomotada, Aso, Yoichi, Ishizaki, Hideharu, Ohishi, Naoko, Yamamoto, Kazuhiro, Uchiyama, Takashi, Miyakawa, Osamu, Kamiizumi, Masahiro, Takamori, Akiteru, Majorana, Ettore, Agatsuma, Kazuhiro, Hennes, Eric, van den Brand, Jo, Bertolini, Alessandro
Format: Article
Language:English
Subjects:
Chains
Feedback
Gravitation
Gravitational waves
Interferometry
Mechanical components
Room temperature
Scientific apparatus & instruments
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Summary:KAGRA is a cryogenic interferometric gravitational wave detector currently under construction in the Kamioka mine in Japan. Besides the cryogenic test masses, KAGRA will also rely on room temperature optics which will hang at the bottom of vibration isolation chains. The payload of each chain comprises an optic, a system to align it, and an active feedback system to damp the resonant motion of the suspension itself. This article describes the performance of a payload prototype that was assembled and tested in vacuum at the TAMA300 site at the NAOJ in Mitaka, Tokyo. We describe the mechanical components of the payload prototype and their functionality. A description of the active components of the feedback system and their capabilities is also given. The performance of the active system is illustrated by measuring the quality factors of some of the resonances of the suspension. Finally, the alignment capabilities offered by the payload are reported.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4942909