Development of a Low Vibration Throttle Cycle Cooler
Cryocoolers with low vibration are desirable in a number of applications including X-ray detectors, superconducting filters, and SQUID magnetometers. Throttle cycle coolers are attractive for these applications because they operate with very low vibration. The continuing pursuit toward higher detector resolution has made it desirable to push the throttle cycle cooler to lower vibration levels.
The largest reduction in cold end vibration is achieved through development of a new throttling mechanism. Further reductions are realized through redesign of the cold tip support, heat exchanger, and heat exchanger supports. In addition to hardware changes, the composition of the mixed refrigerant is shown to affect the magnitude of vibration.
Vibration under 1 kHz is reduced below that of the standard cooler by 350 percent and by an order of magnitude in the axial and radial directions respectively. Cold tip vibration is shown to be lower than that of Gifford-McMahon coolers but somewhat higher than that of boiling liquid nitrogen. Reaction forces at the cooler interface are more than an order of magnitude lower than those of Stirling coolers and at least a factor of 4 below those of a pulse tube expander.
KeywordsHeat Exchanger Pulse Tube Interface Force Acceleration Spectrum Radial Vibration
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