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New 3He/4He refrigerator

✍ Scribed by G. Dall'Oglio; L. Pizzo; L. Piccirillo; L. Martinis

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
217 KB
Volume
31
Category
Article
ISSN
0011-2275

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✦ Synopsis

The sensitivity increase in bolometers obtained by operating temperatures of 1 K (helium-4) and 0.3 K (helium-3), with respect to standard bolometers cooled at pumped 4He temperature, represents in infrared and submillimetric astronomy a remarkable step forward in applications both on large ground telescopes and on stratospheric balloons. The characteristics are introduced of a double stage refrigerator (4He/3He) which allows a temperature of nearly 300 mK to be reached, starting from a temperature of 4.2 K. No moving parts and external links are involved, except for the electric leads, so as to exploit only the condensation and cryosorption cycles of 4He and 3He, without pumping on the main 4He bath.

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