Abstract: A remote cooling system of super-conducting magnets uses a closed cycle auxiliary flow circuit in a cryogenic cooling system. The super-conducting magnet is connected to the cryogenic cooling system via a flexible interface. This flexible interface has a rigid insert on its distal end and may be connected to a cryostat on its proximal side. The rigid end may be inserted in a mating cryogenic interface at the super-conducting magnet. The closed cycle auxiliary flow circuit allows the cryogenic cooled magnet to operate at its designed magnetic field strength and can keep the magnet operational at cryogenic temperatures for extended periods of time since no cryogenic fluid needs to be replenished. Such a system can have test samples raised to room temperature to make sample changes without any need to warm up the magnet. This makes sample change time and experiment turnaround time significantly shorter, and significantly increases productivity.

Abstract: A remote cooling system of super-conducting magnets uses a closed cycle auxiliary flow circuit in a cryogenic cooling system. The super-conducting magnet is connected to the cryogenic cooling system via a flexible interface. This flexible interface has a rigid insert on its distal end and may be connected to a cryostat on its proximal side. The rigid end may be inserted in a mating cryogenic interface at the super-conducting magnet. The closed cycle auxiliary flow circuit allows the cryogenic cooled magnet to operate at its designed magnetic field strength and can keep the magnet operational at cryogenic temperatures for extended periods of time since no cryogenic fluid needs to be replenished. Such a system can have test samples raised to room temperature to make sample changes without any need to warm up the magnet. This makes sample change time and experiment turnaround time significantly shorter, and significantly increases productivity.

Abstract: A closed cycle cryocooler is thermally connected to an elongated, cup-shaped sample well and cools down the sample well. Gaseous helium at a relatively low pressure is introduced into the sample well so that, as the sample well is cooled by the cryocooler, the gas in the sample well is also cooled. A sample is attached to a sample stick assembly which is then lowered into the sample well where the sample is cooled by the cooled gas to carryout experiments at low temperature. The sample stick assembly is mechanically attached to the spectrometer magnets and a flexible rubber bellows connects the sample stick assembly to the sample well so that vibration generated by the cryocooler is not transferred to the sample.

Abstract: A system for cryogenic cooling of a remote cooling target comprising a cryogenic cooling device and a flexible cold fluid discharge interface, said flexible cold fluid discharge interface further comprising a flexible outer hose, a flexible middle recirculation line, a flexible inner hose, a flexible cryogen supply line, a first annular vacuum insulating area disposed between said flexible outer hose and said middle recirculation line, and a second annular vacuum insulating area disposed between said flexible inner hose and said flexible supply line. Said outer flexible hose, first evacuated annular segment, recirculation line, inner hose, second evacuated annular segment and supply line are arranged substantially concentrically.

Abstract: A system for cryogenic cooling of a remote cooling target comprising a cryogenic cooling device and a flexible cold fluid discharge interface, said flexible cold fluid discharge interface further comprising a flexible outer hose, a flexible middle recirculation line, a flexible inner hose, a flexible cryogen supply line, a first annular vacuum insulating area disposed between said flexible outer hose and said middle recirculation line, and a second annular vacuum insulating area disposed between said flexible inner hose and said flexible supply line. Said outer flexible hose, first evacuated annular segment, recirculation line, inner hose, second evacuated annular segment and supply line are arranged substantially concentrically.

Abstract: A closed cycle cryocooler system for cooling a sample includes a cryocooler that receives helium gas and provides a cooled helium gas, a flexible interface that receives the cooled helium gas and provides the cooled helium gas to a rigid stinger assembly configured and arranged to provide the cooled helium gas to a cryostat. The flexible interface may include a first gas flow path that routes gas to the rigid stinger assembly, and a second gas flow path receives return gas from the rigid stinger.

Abstract: In an electron paramagnetic resonance spectrometer, a closed cycle cryocooler is used to cool gaseous helium, which is then circulated around a sample to cool the sample by direct convection. Since the sample is not mechanically connected to the refrigerator, no vibrations are transmitted from the refrigerator to the sample and the sample can be quickly removed and replaced. The cooled helium can be passed through a Joule-Thomson expansion device before circulating the cooled helium around the sample to further cool the helium. In addition, a vacuum pump can be connected to the helium outlet after circulating the cooled helium around the sample to increase the pressure differential across the Joule-Thomson expansion device and further cool the helium. In order to raise the temperature of the cooled helium, a heater can be placed about the cooled helium line upstream from the sample.

Abstract: In an electron paramagnetic resonance spectrometer, a closed cycle cryocooler is used to cool gaseous helium, which is then circulated around a sample to cool the sample by direct convection. Since the sample is not mechanically connected to the refrigerator, no vibrations are transmitted from the refrigerator to the sample and the sample can be quickly removed and replaced. The cooled helium can be passed through a Joule-Thomson expansion device before circulating the cooled helium around the sample to further cool the helium. In addition, a vacuum pump can be connected to the helium outlet after circulating the cooled helium around the sample to increase the pressure differential across the Joule-Thomson expansion device and further cool the helium. In order to raise the temperature of the cooled helium, a heater can be placed about the cooled helium line upstream from the sample.

Abstract: A closed cycle cryocooler is thermally connected to an elongated, cup-shaped sample well and cools down the sample well. Gaseous helium at a relatively low pressure is introduced into the sample well so that, as the sample well is cooled by the cryocooler, the gas in the sample well is also cooled. A sample is attached to a sample stick assembly which is then lowered into the sample well where the sample is cooled by the cooled gas to carryout experiments at low temperature. The sample stick assembly is mechanically attached to the spectrometer magnets and a flexible rubber bellows connects the sample stick assembly to the sample well so that vibration generated by the cryocooler is not transferred to the sample.

Abstract: In an electron paramagnetic resonance spectrometer, a closed cycle cryocooler is used to cool gaseous helium, which is then circulated around a sample to cool the sample by direct convection. Since the sample is not mechanically connected to the refrigerator, no vibrations are transmitted from the refrigerator to the sample and the sample can be quickly removed and replaced. The cooled helium can be passed through a Joule-Thomson expansion device before circulating the cooled helium around the sample to further cool the helium. In addition, a vacuum pump can be connected to the helium outlet after circulating the cooled helium around the sample to increase the pressure differential across the Joule-Thomson expansion device and further cool the helium. In order to raise the temperature of the cooled helium, a heater can be placed about the cooled helium line upstream from the sample.

Abstract: A cryostat includes a thermal interface located at a first end and a cryocooler located at a second end. A thermal link has a thermal connector thermally linking the thermal interface and the cryocooler below a critical temperature. The thermal link is separated from one of the thermal interface and the cryocooler above the critical temperature. A method of operating the cryostat is also disclosed.

Abstract: A closed cycle refrigeration system in conjunction with specific mixed or multiple component refrigerant fluids to produce temperatures in the range of 230° K to 70° K. The mixed component refrigerant can be blended from flammable or a non-flammable fluid components based upon the arrangement of the refrigeration equipment and the overall performance requirements for the system. A compressor, an after cooler, an oil separator, filter/dryer, heat exchanger, a throttle device with fixed orifice and an evaporator are arranged in a manner to improve system performance with refrigeration of the present invention or prior art refrigerants. Replaceable additional modules for oil filtration and moisture filtration can be part of the system.

Abstract: A closed cycle refrigeration system in conjunction with specific mixed or multiple component refrigerant fluids to produce temperatures in the range of 230° K to 70° K. The mixed component refrigerant can be blended from flammable or a non-flammable fluid components based upon the arrangement of the refrigeration equipment and the overall performance requirements for the system. A compressor, an after cooler, an oil separator, filter/dryer, heat exchanger, a throttle device with fixed orifice and an evaporator are arranged in a manner to improve system performance with refrigeration of the present invention or prior art refrigerants. Replaceable additional modules for oil filtration and moisture filtration can be part of the system.

Abstract: A closed cycle cryogenic refrigerating system with a fixed restrictor operates with a compressor inlet pressure in a range of 0.1 Mpa to 0.4 Mpa and compressor discharge pressure in a range of 1.5 Mpa and 2.5 Mpa. A basic cryogenic refrigerant mixture is used to which is added approximately 3% to 25% of helium, hydrogen and/or neon. A ratio of refrigerant density at the inlet of the fixed restrictor between steady-state operation and operation at the beginning of cool-down is in an approximate range of 7 to 17. Relatively rapid cool-down is achieved and evaporator temperature is maintained in an approximate range of 70K to 120K.