Direct measurement of residual gas effect on the sensitivity in TAMA300
| Autor: | Seiji Kawamura, Daisuke Tatsumi, Koji Arai, Gerhard Heinzel, Ryutaro Takahashi, Shigenori Moriwaki, Mitsuhiro Fukushima, Masaki Ando, Y. Saito, Toshitaka Yamazaki |
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| Rok vydání: | 2002 |
| Předmět: |
Physics
Gravitational-wave observatory business.industry Scattering Vacuum tube chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Laser Noise (electronics) Surfaces Coatings and Films law.invention Interferometry Optics Xenon chemistry law Astronomical interferometer business |
| Zdroj: | Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 20:1237-1241 |
| ISSN: | 1520-8559 0734-2101 |
| DOI: | 10.1116/1.1479360 |
| Popis: | A laser interferometer gravitational wave detector requires an ultrahigh vacuum in the tubes in which the laser beams pass. TAMA300, involves two 300-m vacuum tubes, and is kept at 2×10−6 Pa of vacuum pressure so as to reduce scattering effects due to residual-gas molecules. The sensitivity attained so far is 2×10−18 m/Hz around 1 kHz. By introducing a Xe gas into the entire system of TAMA300, we directly observed the residual-gas effect on the sensitivity. It was found that Xe-gas pressure of 0.03 Pa induces an increase in the mirror displacement noise of 3×10−18 m/Hz. This noise level is consistent with a calculated optical fluctuation of the laser beam due to residual-gas scattering. |
| Databáze: | OpenAIRE |
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