Effect of a heat exchange between turns of a winding pack on cool down mode of forced-cooled S/C magnets (for ITER)

• Published in: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Vol. 28; no. 1; pp. 240 - 243
• Main Authors: Volkov, A.F., Kalinin, V.V., Krivchenkov, Y.M., Panin, A.G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: United States IEEE 01-01-1992
• Subjects: 420400 > Engineering > Heat Transfer & Fluid Flow; 665412 > Superconducting Devices > (1992-); 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 700450 > Fusion Technology > Blankets & Cooling Systems > (1992-); CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONVECTION; Dielectrics and electrical insulation; ELECTRICAL EQUIPMENT; ELECTROMAGNETS; ENERGY TRANSFER; ENGINEERING; FLUID MECHANICS; FORCED CONVECTION; HEAT TRANSFER; Inductors; Magnetic analysis; MAGNETS; MASS TRANSFER; MECHANICS; Steel; STRESSES; SUPERCONDUCTING COILS; SUPERCONDUCTING DEVICES 700430 > Fusion Technology > Magnet Coils & Fields > (1992-); SUPERCONDUCTING MAGNETS; Temperature; THERMAL STRESSES; THERMODYNAMICS; THERMONUCLEAR REACTORS; Toroidal magnetic fields
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.119855

Results of thermal and stress analysis show that the cool-down scenario with linear helium inlet temperature decrease rate of 2 K/hour is believed to be realistic for the ITER (International Thermonuclear Experimental Reactor) magnet system. Under this helium inlet condition the coil cool-down time can be reduced to 150 hours. The equivalent stress in the TFC (toroidal field coil) case and in the superconductor's jacket does not exceed allowable stress for the steel used. As for the electrical insulation of the winding pack, glass-fiber-reinforced epoxy can be used on the condition that its allowable stress normal to the laminae direction is not less than 140 MPa. According to the thermal analysis, the heat exchange between the winding pack turns and pancakes can strongly affect the coil cool-down only for the magnet with both layers of the double pancakes connected in series.< >