Author/Authors :
RS Bhatia، نويسنده , , S.T. Chase، نويسنده , , W.C. Jones، نويسنده , , B.G. Keating، نويسنده , , A.E. Lange، نويسنده , , P.V. Mason، نويسنده , , B.J. Philhour، نويسنده , , G. Sirbi، نويسنده ,
Abstract :
We have designed and built a cryogenic system which uses no expendable liquid cryogens and consists of a three-stage cryocooler together with a three-stage sorption cooler to achieve a base temperature of 239 mK. We achieve a temperature of 250 mK at the expected 0.5 μW loading. The duty cycle of the sorption cooler alone is 93%. The cryogenic system is designed for autonomous cycling and operation, and will be used to cool the detectors and optics on the Polatron instrument to observe the 2.7 K cosmic microwave background.
Keywords :
Infrared detectors , Joule–Thomson coolers , 3He systems , Sorption coolers , Gifford–McMahon
