Experimental evaluation of a single stage superfluid stirling refrigeratorusing a large plastic recuperator

This paper describes the low and high temperature experimental performance of the second single stage superfluid Stirling refrigerator (SSR) to use a plastic recuperator. This SSR has a total interval volume of 96.6 cm(3) and uses a Kapton recuperator which hers 12.10 cm(3) devoted to recuperative h eat transfer. Operating from a high temperature of 1.0 K and with 1.5% and 3.0% He-3-He-4 mixtures, this SSR achieves a low temperature of 291 mK and delivers net cooling powers of 3705 mu W at 750 mK, 977 mu W at 500 mK, and 409 mu W at 400 mK. Cooling power versus cold piston temperature for vario us frequencies of operation and for two piston stroke configurations are al so provided These results ave non-dimensionalized and compared to the Schmi dt model of a regenerative Stirling refrigerator and the adiabatic model of a recuperative Stirling refrigerator. The SSR was also operated from high temperatures between 1.0 K and 2.0 K. This SSR achieves low temperatures of 412 mK, 620 mK, 1.069 K, and 1.459 K operating from high temperatures of 1 .2 K, 1.4 K, 1.6 K, and 1.8 K respectively. This high temperature performan ce is compared to the theoretical performance of the SSR using a phonon-rot on gas model.