Cryogenic refrigeration device

A cryogenic refrigeration device comprising:

• an enclosure delimiting a vacuum-sealed volume closed by a cover;
• a cryogenic cooler mounted through the cover and having a first end located outside the enclosure and a second end located inside the enclosure, the cryogenic cooler being configured to supply cold at the second end;
• and
• at least two thermally conductive plates distributed in a distribution direction in the enclosure and forming thermal stages,
• wherein at least some of the plates are configured to be cooled by the cryogenic cooler to respective predetermined temperatures which decrease in the distribution direction,
• wherein at least one of the plates is connected to a thermal shield forming a volume which encloses at least one following plate,
• wherein the cryogenic cooler is configured to use a cold source of liquefied cycle fluid, the cooling power of the cryogenic cooler being stored and/or produced at a first end of the cryogenic cooler, at least some of the plates being cooled by the cycle fluid via a set of heat exchangers in heat exchange with said at least some of the plates and with a flow of the cycle fluid which transfers the cooling power from the first end to the second end of the cryogenic refrigerator.