A thermosiphon cooling system is presented. One embodiment of the thermosiphon cooling system includes a reservoir having a first portion configured to store a liquid coolant. The thermosiphon cooling system also includes a tubing unit coupled to the reservoir and disposed adjacent to at least one superconducting unit to be cooled and configured to receive the liquid coolant from the first portion of the reservoir, and circulate the received liquid coolant within the tubing unit to dissipate heat generated by the at least one superconducting unit. The received liquid coolant is circulated within the tubing unit by varying a density of the received liquid coolant at different portions of the tubing unit.

An evaporative cooling apparatus may include a heat transfer module having a vapor passage in fluid communication with a liquid refrigerant in a first container and a heat absorbing module having a drawing liquid selected to absorb the liquid refrigerant in the second container. The heat absorbing module also has a vapor chamber in the drawing fluid that receives vapor generated during evaporation of the liquid refrigerant. The vapor chamber has a selectively permeable membrane that: (i) transports the vapor to the drawing liquid, and (ii) blocks flow of the drawing fluid into the vapor chamber. The refrigerant may be liquid water, the vapor chamber may include a selectively permeable membrane having a pore size between 1 nm and 200 nm, and the drawing fluid may be glycerol.

A means and a method to cool down an MRI magnet, in a cryostat that is designed for a maximum pressure of about 0.2 MPa, are described which use cold helium output from a Brayton cycle refrigerator at a pressure of about 0.8 MPa to exchange heat with helium in the MRI cryostat in a coupling heat exchanger that is located removeably in or proximate the neck tube of the MRI cryostat. A circulator drives helium from the MRI cryostat through the coupling heat exchanger.

Provided is an ultra-low-temperature device that enables the cold head of a refrigeration device to be coupled in a detachable manner so as to be capable of highly efficient heat transfer with respect to an object being cooled, while effectively suppressing the infiltration of heat into the object being cooled. This ultra-low-temperature device is equipped with: a cooled object container (16); a cold head insertion unit (18) having a cylindrical part (32) and a base part (34); a thermal coupling formation part (60) forming a thermal coupling part between the low-temperature end (28) of the cold head (26) and the base part (34); and a heat switch (70) provided between the base part (34) and the cooled object (12). The thermal coupling formation part (60) has refrigeration-device side recesses and protrusions (61, 62) and insertion-unit-side recesses and protrusions (63, 64), with the thermal coupling part being formed by the freezing of a gaseous heat transfer medium in the gaps (66) between these recesses and protrusions. The heat switch (70) has an insertion-unit-side heat switch element provided on the base part (34), and a cooled-body-side switch element, and the transfer of heat is enabled or prevented on the basis of whether the switch elements are in contact or are separated from each other.

A liquefier includes a Dewar having a storage portion and a neck portion extending therefrom. A hermetically isolated liquefaction chamber is disposed within the neck of the Dewar. One or more control components including a temperature and pressure sensor are coupled to a CPU and disposed within the liquefaction chamber for dynamic control of liquefaction conditions. A gas flow control is coupled to the CPU for regulating an input gas flow into the liquefaction chamber. A volume surrounding the liquefaction chamber may be adapted to provide a counter-flow heat exchange. These and other features provide improved liquefaction efficiency among other benefits.

A gas-flow cryostat adapted for dynamic temperature regulation using a fluid level sensor; the cryostat further including one or more heaters coupled to various components of the cryostat. As fluid evaporates from a liquid cryogen evaporation reservoir within the cryostat, the fluid level sensor and a feedback control unit are adapted to monitor and dynamically control the level of evaporating cryogen by regulating the heaters. Accordingly, the cryostat is adapted to dynamically control temperature about a specimen region within the cryostat. The cryostat can be used in various applications, including analytical laboratory equipment for measuring various physical properties of samples. Temperature sensors are further incorporated for added control and optimization of the cryostat.

A cryogen vessel port arrangement for a magnetic resonance imaging (MRI) system has a port for guiding cryogen into a cryogen vessel. The port has a siphon tube, a siphon cone, which is in flow connection with the siphon tube, and a pipe with an inlet opening and an outlet opening. The inlet opening is configured for connecting it with a coldhead sock and the outlet opening is in flow connection with the port and the siphon cone. The port has a port component that has a flow channel with a first opening configured for connecting it with a service siphon, a second opening in flow connection with the siphon cone, and a third opening in flow connection with the outlet opening of the pipe.

The present disclosure relates to a superconducting magnet apparatus including a cryogenic cooler and a cooler chamber accommodating the cooler. At least one protrusion is provided on one of the outer surface of the cryogenic cooler and the inner surface of the cooler chamber, and a holding groove is provided in the other one thereof. The protrusion is inserted in the holding groove, thereby stably maintaining a state in which the cryogenic cooler is installed in the cooler chamber through the holding groove and protrusion.

A cryogenic cooling system that includes a cooled plate thermally coupled to a cryogenic refrigerator, a target assembly that includes a target refrigerator configured to achieve a lower base temperature than the cryogenic refrigerator, and a heat switch assembly with one or more gas gap heat switches. The heat switch assembly has a first end thermally coupled to the cooled plate and a second end thermally coupled to the target assembly. A sorption pump is configured to control thermal conductivity across the heat switch assembly based on the temperature of the sorption pump. The sorption pump is thermally coupled to the cryogenic refrigerator by a thermal link extending from the cooled plate to the heat switch assembly, with the sorption pump positioned along the thermal link between the cooled plate and the heat switch assembly.

A method is provided for precooling a cryostat having a hollow cold head turret into which a neck tube protrudes and connects an object to be cooled to the exterior of the cryostat, wherein a cold head having a cold head stage for cooling a cryogenic working medium may be introduced into the neck tube. During a condensation operation the cryogenic working medium flows through a heat pipe into an evaporator chamber which is thermally conductively connected to the object to be cooled. During a precooling phase a precisely fitting, thermally conductive short circuit block is inserted through the neck tube into the heat pipe to provide thermal conduction between the object to be cooled and a cooling device The short circuit block is removed from the heat pipe after the target temperature is reached, and heat is subsequently transmitted through the heat pipe during a condensation operation.