Use of polymer materials for the regenerator of a pulse tube refrigerator

摘要

A pulse tube refrigerator for cooling high-T_c SQUID gradiomcters is currently under deveiopment. For that purpose we are going to substitute all metallic and magnetic parts from the cold-finger. In this contribution we will present new investigations of regenerator materials made of polymers. We achieved minimal temperatures below 50 K and a cooling power of 12 W at 80 K with polymer mesh screens using a metallic coaxial single stage four-valve pulse tube refrigerator . These materials have to meet mechanical requirements in order to get a long-life cryocoolcr.