Damping system for torsion modes of mirror isolation filters in TAMA300

Y. Arase*, R. Takahashi, K. Arai, D. Tatsumi, Mitsuhiro Fukushima, T. Yamazaki, Masa Katsu Fujimoto, K. Agatsuma, N. Nakagawa

*この研究の対応する著者

研究成果査読

抄録

The seismic attenuation system (SAS) in TAMA300 consists of a three-legged inverted pendulum and mirror isolation filters in order to provide a high level of seismic isolation. However, the mirror isolation filters have torsion modes with long decay time which disturb the interferometer operation for about half an hour if they get excited. In order to damp the torsion modes of the filters, we constructed a digital damping system using reflective photosensors with a large linear range. This system was installed to all of four SASs. By damping of the target torsion modes, the effective quality factors of the torsion modes are reduced to less than 10 or to unmeasurable level. This system is expected to reduce the inoperative period by the torsion mode excitation, and thus will contribute to improve the duty time of the gravitational wave detector.

本文言語English
論文番号012027
ジャーナルJournal of Physics: Conference Series
122
DOI
出版ステータスPublished - 2008
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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