Abstract Double stage pulse tube crycoolers (PTC) capable of lifting about 0.5W of cooling power at 4K are commercially available. Single stage 3He and 3He sorption coolers have been developed for both ground and space applications. A precooling temperature below 2.5K is required to operate a sorption cooler efficiently. This is commonly achieved with a pumped liquid 3He bath. However for some applications (for example bolometers cooling in astrophysics) the vibrations induced by the pumping system are problematic. In addition the fraction of liquid lost during the bath pump down significantly affects the bath hold time. To overcome this difficulty, a double stage (4He/3He) sorption cooler has been developed by CEA/SBT that can be operated either from an atmospheric 3He bath or from a 4K PTC, and which provides temperature down to 260 mK. This paper presents the performance obtained with such a double stage sorption cooler using a 4 K CRYOMECH PT405 Pulse tube for precooling. A similar approach is under development with a dilution fridge being coupled with a 4K pulse tube.
Sub-Kelvin Mechanical Coolers
Cryocoolers 12 ; 669-673
2003-01-01
5 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
British Library Conference Proceedings | 2003
|Sub-Kelvin Sorption Coolers for Space Application
Springer Verlag | 2002
|Sub-Kelvin Sorption Coolers for Space Application
British Library Conference Proceedings | 2001
|