Abstract

A dilution refrigerator with two mixing chambers is described. When compared with a dilution refrigerator with only one mixing chamber the temperature range is extended to lower temperatures. The temperature reduction factor can be up to a factor 2.8. The results of an experiment are reported in which a magnetic temperature of 5.5 mK was obtained in the continuous mode and 3.5 mK in the single cycle mode, using a dilution refrigerator that reaches 13 mK in the continuous mode with one mixing chamber.

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