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

Fabián Erasmo Peña Arellano*, Takanori Sekiguchi, Yoshinori Fujii, Ryutaro Takahashi, Mark Barton, Naoatsu Hirata, Ayaka Shoda, Joris Van Heijningen, Raffaele Flaminio, Riccardo DeSalvo, Koki Okutumi, Tomotada Akutsu, Yoichi Aso, Hideharu Ishizaki, Naoko Ohishi, Kazuhiro Yamamoto, Takashi Uchiyama, Osamu Miyakawa, Masahiro Kamiizumi, Akiteru TakamoriEttore Majorana, Kazuhiro Agatsuma, Eric Hennes, Jo Van Den Brand, Alessandro Bertolini

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

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.

Original languageEnglish
Article number034501
JournalReview of Scientific Instruments
Volume87
Issue number3
DOIs
Publication statusPublished - 1 Mar 2016

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