Continued Development of a 10 K Cryogenic Cooler.
Final technical rept. 1 Jun-31 Dec 81,
PHILIPS LABS BRIARCLIFF MANOR NY
Pagination or Media Count:
Development of the design selected for the 10 degree K cryogenic cooler in the Phase I study was continued in this second phase of the program. The configuration arrived at in Phase 1 was a triple-expansion, free-displacer Stirling-cycle refrigerator driven by a linear motor. Vibrations are attenuated with a passive vibration absorber. Electromagnetic noise from the motor is attenuated with layered, high permeability, magnetic shielding. The cooler can meet or better the goals for cooling and power consumption. It can provide 200 mW of cold at 10 degrees K at the maximum allowable input of 250 W, or provide the prescribed 50 mW of cold with less than 100 W of input power. The cooler weight is 35.9 kg for the thermodynamic components, 17 kg for the vibration absorber, and 8.6 kg for the EMI shielding. The design goals for cooldown time and regulation of the cold-tip temperature can be met or bettered. The resulting EMI and vibration levels can not be accurately predicted, but they are expected to exceed the extremely low levels desired. Author
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