Stability of Internally Cooled Superconductors
Interest has been shown in the cooling of composite superconductors by dense-fluid phase helium at pressures in excess of the critical pressure (2.26 atm). The fluid is circulated internally in a hollow superconductor to take advantage of the high-heat transfer rates characteristic of flowing dense-phase helium. In addition, refrigeration may be supplied to the magnet by a sealed cooling system integral with the cryostat. Tests on samples of this type of conductor will be made at the Stanford Linear Accelerator Center and at Brookhaven National Laboratories. It has been suggested that this scheme will allow high current densities to be obtained in larger coils without the necessity for a liquid helium tank encasing the complete coil. The greater structural integrity of a tight wound coil design would produce obvious advantages in bracing the coil against mechanical stresses induced by the current and magnetic field.
KeywordsHeat Transfer Coefficient Normal Region Critical Length Normal Zone Upstream Edge
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