Composite Matrix Regenerators for 10K Cryocoolers

This project will fabricate and test composite matrix regenerators (CMRs) for use in the temperature regime below 20 K. High capacity rare earth compounds and high conductivity pure metallic components are combined to provide adequate capacity at low temperature with good heat transfer. The innovative channel geometry is conducive to high thermal effectiveness with low viscous losses. A specific goal is to achieve faster thermal response in the regenerator bed than previously achieved with bed rare earth compounds, enabling higher cryocooler frequency, power, and efficiency. Phase I effort will focus on materials development and thermal testing at relevant temperatures. Thermal penetration, pressure drop, and debris generation will be monitored. The potential benefits for multistage Stirling cryocoolers will be assessed with available Stirling modeling codes. Phase II would develop a prototype CMR having rapid response and high thermal effectiveness near 10 K for testing in a mechanical cryocooler.