Abstract
We developed a vibration-free cryocooler system based on a 4 K pulse tube (PT) cryocooler for a cryogenic interferometric gravitational wave detector. In this system, we incorporated a vibration-reduction system that consists of a firm support for the cold head and a rigid cold table thermally linked to the cold stage to reduce both the vibrations of the overall cold head and those of the cold stage. Our cryocooler system reduced the cold-head vibration of the baseline PT cryocooler by over three orders of magnitude, where the vibration level was on the order of \( 10^{ - 9} /f^2 m/\sqrt {Hz}\).
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