Abstract: A cryostat for providing temperature regulation, one purpose being measuring physical properties of materials, the cryostat employing a superconducting magnet assembly for generating variable magnetic field in the sample space and a cryogenic cooler for cooling the sample space. The cryogenic cooler chamber configuration provides for efficient heat exchange between different stages of the cryogenic cooler without the need for physical heat links. This construction enables selective delivery of cooling power from the cryogenic cooler to the desired areas within the cryostat without using flexible physical thermal links. A counter flow exchanger and ambient temperature valves facilitate efficient use of the cryogenic cooler stages. The removal of large heat load generated by the superconducting magnet while operating in the sweeping mode is achieved, in part, by employing a solid plate thermal coupling element between the cryogenic cooler chamber and the magnet assembly.

Abstract: There is disclosed a refrigeration apparatus including a cascade heat exchanger and capable of reducing the depth dimension of the apparatus itself without being influenced by the thickness dimension of an insulating material for covering the cascade heat exchanger, so that the apparatus can easily be carried indoors through a usual carrying entrance. In a refrigeration apparatus 1 including a high-temperature-side refrigerant circuit 25 and a low-temperature-side refrigerant-circuit 38, an evaporator 34 of the high-temperature-side refrigerant circuit 25 and a condensing pipe 42 of the low-temperature-side refrigerant circuit 25 constitute a cascade heat exchanger 43, and an evaporation pipe 62 of the low-temperature-side refrigerant circuit 38 is configured to cool a storage chamber 4 constituted in an insulating box body 2 to an extremely low temperature.