highlight / actuality
A small cryo-refrigerator dedicated to space missions reached temperatures lower than 4.2K (liquid helium) in our laboratory for the first time. This is the world record using helium 4 and some improvements are still expected with helium 3.
One of the key parts of this cryo-refrigerator is the porous media called the regenerator which stores the energy of the working gas. In order to enhance its storage capacity, we developed new structures with specific heat anomalies in the 4K - 20K temperature range (cf. Fig.) and we put them in the regenerator. Starting from 20K, we reached an ultimate temperature near 3.8K and the system is able to produce 15mW at 4.5K.
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.