document: Vacuum-compatible vibration isolation stack for an interferometric gravitational wave detector TAMA300 Interferometric gravitational wave detectors require a large degree of vibration isolation . For this purpose , a multilayer stack constructed of rubber and metal blocks is suitable , because it provides isolation in all degrees of freedom at once . In TAMA300 , a 300 m interferometer in Japan , long-term dimensional stability and compatibility with an ultrahigh vacuum environment of about 10/sup -6 / Pa are also required . To keep the interferometer at its operating point despite ground strain and thermal drift of the isolation system , a thermal actuator was introduced . To prevent the high outgassing rate of the rubber from spoiling the vacuum , the rubber blocks were enclosed by gas-tight bellows . Using these techniques , we have successfully developed a three-layer stack which has a vibration isolation ratio of more than 10/sup 3 / at 300 Hz with control of drift and enough vacuum compatibility
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