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We report design details of the whole assembly of a compact and continuousnuclear demagnetization refrigerator (CNDR) with two PrNi$_5$ nuclear stages,which can keep temperature below 1 mK continuously, and test results of a newthermal contact method for the PrNi$_5$ stage using Zn soldering rather than Cdsoldering. By measuring a residual electrical resistance of a short test piece,the thermal contact resistivity between the PrNi$_5$ rod and an Ag wiresthermal link was estimated as $1.8\pm0.1 \times 10^{-4}T^{-1}~\rm{Km^2W^{-1}}$. Based on this value and 2D numerical and 1D analyticalthermal simulations, the largest possible temperature gradient throughout thenuclear stage was calculated to be negligibly small ($\leq$ 2 %) at 1 mK undera 10 nW heat leak, the expected cooling power of the CNDR.

Construction of Continuous Magnetic Cooling Apparatus with Zinc Soldered PrNi$_5$ Nuclear Stages