Two-Stage Pulse Tube Cryocoolers for 4 K and 10 K Operation

Abstract

Cryomech has developed large capacity two-stage pulse tube cryocoolers for 4 K and 10 K applications. Both cold heads employ a double-inlet configuration in a compact design. The 4 K model, the PT410, uses rare earth materials in the second stage regenerator. It was improved to provide 1.07W at 4.2 K and 40W at 40.5 K, simultaneously, while consuming 8 kW of electrical power. The 10 K model, the PT810, was developed by modifying the PT410, by using only the lead spheres in the 2nd-stage regenerator. It has 4W at 10 K and 42W at 45 K, simultaneously, and consumes the same electrical power of 8 kW. All the two-stage pulse tubes have been designed to provide a meantime between maintenance {\textrangle} 5 years.