Development of a sub-mK Continuous Nuclear Demagnetization Refrigerator

David Schmoranzer (1) , Rasul Gazizulin (1) , Sébastien Triqueneaux (2) , Eddy Collin (1) , Andrew Fefferman (1)

1 NEEL - UBT - Ultra-basses températures
2 NEEL - Cryo - Cryogénie

We present the development of a two-stage PrNi$_5$ continuous demagnetization refrigerator at the Institut Nel/CNRS and numerical simulations of its performance. The thermal model used in the simulations is discussed in detail including the likely sources of heating. We demonstrate the effects of the critical thermal links including superconducting heat switches as well as the heat conductivity of the PrNi$_5$ , accounting for the dependence of cooling power on the PrNi$_5$ rod diameter. Our simulations show that if care is taken to minimize the thermal resistance between the nuclear stages, a sample temperature of 1 mK can be maintained under a 20-nW heat load.

Mots clés: Ultra-low temperatures; Adiabatic nuclear demagnetization; PrNi$_5$; Continuous refrigeration techniques

Domaines: Instrumentations et Détecteurs [physics.ins-det]; Physique Générale [physics.gen-ph]

David Schmoranzer, Rasul Gazizulin, Sébastien Triqueneaux, Eddy Collin, Andrew Fefferman. Development of a sub-mK Continuous Nuclear Demagnetization Refrigerator. Journal of Low Temperature Physics, 2019, 196 (1-2), pp.261-267. ⟨10.1007/s10909-018-02128-9⟩. ⟨hal-01886040⟩