Development of 4 K pulse tube cryorefrigerators at cryomech Available to Purchase

Cryomech, Inc. has continued the development of two-stage 4 K pulse tube cryorefrigerators. To address the concerns of customers with vibration levels due to the stretching in the tubes, a vibration elimination apparatus reduced the maximum displacement from 25 μm to <3 μm. The PT405, 0.5 W @4 K, was modified into a model PT407, by using the CP970 Compressor Package increasing the input power from 4.7 to 7.2 kW. It provides 0.72 W @4.2 K with 34 W @55 K. A new 4 K model, PT410, has been developed with cooling capacities of 0.83 W @4.2 K with 38 W @45 K for 8.0 kW power input. The PT410 is driven by one CP970 Compressor Package. With changing the flow impedances, the PT410 also can provide 1.05 W @4.2 K and simultaneously 28 W @56 K again for 8.0 kW of input power.