A high capacity completely closed-cycle 250 mK 3He refrigeration system based on a pulse tube cooler

We present the design of a completely closed-cycle refrigeration system. The system consists of four stages; the first two, 40.5 and 2.7 K, are provided by a pulse tube cooler, the third and fourth stages by helium adsorption refrigerators. The adsorption refrigerators use 4He and 3He with base temp...

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Veröffentlicht in:	Cryogenics (Guildford) 2004-09, Vol.44 (9), p.611-616
Hauptverfasser:	Devlin, M.J, Dicker, S.R, Klein, J, Supanich, M.P
Format:	Artikel
Sprache:	eng
Schlagworte:	3He adsorption refrigerator Applied sciences Cryogen-free Cryogenics Energy Energy. Thermal use of fuels Exact sciences and technology Pulse tube cooler Refrigerating engineering Refrigerating engineering. Cryogenics. Food conservation Techniques. Materials
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Beschreibung
Zusammenfassung:	We present the design of a completely closed-cycle refrigeration system. The system consists of four stages; the first two, 40.5 and 2.7 K, are provided by a pulse tube cooler, the third and fourth stages by helium adsorption refrigerators. The adsorption refrigerators use 4He and 3He with base temperatures of 700 and 250 mK, respectively. Performance tests including some with the cooler rotated from the vertical showed that with a load of 15 μK, a temperature below 286 mK can be maintained for 72 h.
ISSN:	0011-2275 1879-2235
DOI:	10.1016/j.cryogenics.2004.03.001