Analysis of a High Efficiency 4K GM Refrigerator Operating at a Lower Pressure Ratio
Conceptual Design of Space Qualified 4K Pulse Tube Cryocooler
Development of a High Efficiency 4K GM Refrigerator
Multilayer Magnetic Regenerators with an Optimum Structure around 4.2K
Performance Dependence of 4K Pulse Tube Cryocooler on Working Pressure