Evaluation of Conductor Sheath Alloys for a Forced-Flow Nb3Sn Superconducting Magnet Coil for the Large Coil Program
The Westinghouse-Airco superconducting toroidal magnet design for the Large Coil Program (LCP) employs forced-flow, supercritical liquid helium to cool the niobium-tin superconducting windings. This requires that the conductor sheath, and in particular the longitudinal seam weld that closes the sheath over the bundled conductor during manufacture, be absolutely leak tight. Normal operating stresses in the sheath are approximately 240 MPa; however, during a fault condition the local stresses can approach 1035 MPa.
KeywordsFracture Toughness Weld Metal Fusion Zone Delta Ferrite Weld Fusion Zone
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