Cryogenic system plays a vital role in the development of magnet technology. Especially for superconducting magnet，it would be in more widespread use now if it were not for the problems associated with the cryocoolers or cryostats required to cool down those superconducting devices or facilities.
For a variety of high-Tc superconducting magnet applications such as energy storage, generators...
A 4.8-m-long cryostat has been developed to cool a pair of 1.9-m-long planar superconducting undulator magnets (SCUs). The final design and the thermal model of this cryocooler-cooled LHe-based cryostat has been completed. The cryostat is fabricated and a preliminary cool-down test has been performed. This paper presents a comparison between measured and calculated thermal performance of the...
NIMS has started design of a magnetic refrigerator to cool quantum computers. As well known, quantum computer is bringing a revolution to the world of super computers. In general, 3He-4He dilution refrigerators are used to cool the quantum computers at operating temperature below 100mK. However, dilution refrigerator uses a lot of helium 3, that is very expensive these days. On the other hand,...
A HTS conductors test facility can be inserted in a 19.5 T @200 mm bore resistive magnet and operating temperature ranges from 4.5 K to 50 K with current up to 100 KA is under design. A superconducting transformer with a 200 A primary winding composed of immersion cooled NbTI conductors and a 100 kA secondary winding composed of force-flow cooled CICC as the current supply for HTS sample....
In order to meet the normal operation of HECRAL (Hybrid superconducting Electron Cyclotron Resonance ion source with Advance in Lanzhou) superconducting magnet, a cryostat in the form of immersed in liquid helium was designed, which integrated two two-stage GM cryocoolers, helium tank, thermal shield, outer dewar, suspension structures, maintenance tower, binary current leads, corresponding...
Recently, energy production and cooling technology using hydrogen has been developed worldwide. In particular, the ortho-para conversion process, which was a problem in hydrogen liquefaction, was overcome through the development of catalysts. Hydrogen has been an attractive material as a refrigerant due to its low liquefaction point and high thermal conductivity. In superconducting...
The Fermilab horizontal test stand previously used for testing the LHC inner triplet quadrupoles has been upgraded to test cryo-assemblies for the HL-LHC upgrade. The test requirements of these new cryo-assemblies required additional capabilities of the test stand cryogenic system, including controlled cool-down and warm-up, helium recovery after a quench, and operation at higher pressures. ...
As the use of renewable energy increases in the future, hydrogen production is predicted to increase significantly. As the amount of hydrogen used increases, it is more cost-effective to transport in liquid hydrogen state than to transport in high pressure gas form. So, the more liquid hydrogen is used, the greater the opportunity for the high-temperature superconducting coil to cool the...
A refrigerant circulation cooling system for a HTS (High Temperature Superconducting) coil shows better cooling performance than a heat conduction cooling system when the distance between a cryo-cooler and the HTS coil becomes large because the temperature gradient between the coil and the cryo-cooler becomes small. By combining this excellent cooling system with magnetic refrigeration...
As an industrial application of the high-temperature superconducting coils (HTS coils), for example, an induction heating device that rotates a metal in a DC magnetic field by a superconducting coil have been studied. For that purpose, when operating the HTS coils, it is necessary to remove the heat from the coils and keep those at about 50K or less. In addition, assuming application to...
Abstract : To cool the superconducting magnets of compact synchrotron, a forced flow cooling system based on GM/J-T concept with cooling capacity of 10 watts at 4.5K is researched. The cooling system consists of heat exchanger, precooling system, J-T valve and forced flow cooling tank. In refrigeration process, high pressure helium is cooled by the heat exchanger and precooling system, and...
In the superconducting magnet system, which is the core equipment of the fusion experimental device, a large number of measuring equipment are installed in the system for the operation and monitoring of the system. Although each measuring equipment is inspected and repaired during the maintenance period of the experimental device, there is a concern that trouble may occur in the measuring...
