Abstract
This chapter explores the origin of the vibration in a pulse tube cryocooler system, the vibration reduction method, the achieved performance of cooling power and vibration level, and the progressing test overview. A pulse tube cryocooler system with a quite low vibration level has been developed for a gravitational wave detector. The origin of two types of vibration in a cryocooler system is identified, and a vibration-reduction method has been developed. A thermal link by using bundles of thin pure aluminum wires is applied for the vibration reduction at the cold stages, together with a bellows for vibration reduction at the cold head. The performance of vibration of 50 nm in the Z-direction at the second VR stage, and with a cooling power of 0.4 W at 4.2K and 15 W at 45 K has been achieved by using a 7 kW GM-type compressor. The overall vibration level is also confirmed as being identical with that of the seismic level at Kamioka mine. Results of development and the final performance of a vibration-free cryocooler system have been presented.
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