Abstract:We present a cryogen-free 3 He/ 4 He dilution refrigerator (DR) which was precooled by a 10 K pulse tube refrigerator (PTR), CRYOMECH, model PT805. The PT805 has no rare-earth materials in the second stage regenerator which are very expensive and normally generate oscillating magnetic fields with amplitudes of -20 nT at low temperatures. The challenge for our application was that the base temperature of our PTR was 5.5 K which is -3 K higher than that of a standard 4 K-PTR (-2.5 K). After being precooled by th… Show more
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