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50 mK Continuous Cooling with ADRs Coupled to ³Helium

J. Duval1, N. Luchier1, L. Duband1, A. Sirbi2
1CEA/DSM/INAC/SBT, 38 054 Grenoble Cedex 09, France, 2ESA / ESTEC, Noordjwick, The Netherlands

Abstract

CEA/SBT has well established knowledge and recognized experience in sorption coolers reaching 200 to 300 mK. Combining sorption cooler developments with adiabatic demagnetization refrigerators creates the possibility to reaching temperatures below 50 mK with a limited mass budget (less than 5 kg for a 1 μW cooler). In the framework of an ESA contract we are developing such a cooler for continuous cooling at 50 mK based on this technology. The cycle chosen is described and discussed. Mass and efficiency optimization is being done and a trade-off is presented. Experimental results on a one-shot cooling system reaching a temperature of 30 mK are also shown.