Parametric instabilities and their control in advanced interferometer gravitational-wave detectors
A detailed simulation of Advanced LIGO test mass optical cavities shows that parametric instabilities will excite 7 acoustic modes in each fused silica test mass, with parametric gain R up to 7 and only 1 acoustic mode with R approximately 2 for alternative sapphire test masses. Fine-tuning of the t...
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Published in | Physical review letters Vol. 94; no. 12; p. 121102 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.04.2005
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Online Access | Get more information |
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Summary: | A detailed simulation of Advanced LIGO test mass optical cavities shows that parametric instabilities will excite 7 acoustic modes in each fused silica test mass, with parametric gain R up to 7 and only 1 acoustic mode with R approximately 2 for alternative sapphire test masses. Fine-tuning of the test mass radii of curvature causes the instabilities to sweep through various modes with R as high as approximately 2000. Sapphire test mass cavities can be tuned to completely eliminate instabilities using thermal g-factor tuning. In the case of fused silica test mass, instabilities can be minimized but not eliminated. |
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ISSN: | 0031-9007 |
DOI: | 10.1103/PhysRevLett.94.121102 |