Dilution refrigeration device and method

A dilution refrigeration device for achieving temperatures between one and around 100 millikelvin, comprising:

• a working circuit in the form of a loop containing a cycle fluid comprising a mixture of helium-3 (3He) and helium-4 (4He), the working circuit comprising, in series:
• a mixing chamber,
• a boiler,
• a transfer member,
• a first set of pipes fluidically connecting the mixing chamber, boiler, and transfer member, the first set of pipes being configured to transfer cycle fluid from an outlet of the mixing chamber to an inlet of the boiler and from an outlet of the boiler to an inlet of the transfer member, and
• a second set of pipes connecting an outlet of the transfer member to an inlet of the mixing chamber;
• at least a first heat exchanger portion for heat exchange between at least a part of the first set of pipes and the second set of pipes, the first heat exchange portion being situated between the boiler and the mixing chamber;
• at least one cooling member which is in heat exchange with the working circuit and is configured to transfer cold energy to the cycle fluid;
• at least one thermally insulated cold box which contains parts of the dilution refrigeration device at cryogenic temperatures;
• and
• at least one cryogenic pumping member situated within the at least one thermally insulated cold box and integrated in the working circuit, wherein the at least one cryogenic pumping member is further situated between the boiler and the transfer member, wherein the at least one cryogenic pumping member is configured to perform cold compression at a low temperature below 1 K.