Abstract
The 45 T hybrid magnet system under construction for the National High Magnetic Field Laboratory will contain three superconducting coils using cable-in-conduit conductor technology. Two of these will use Nb 3Sn wire and will be fabricated by the insulate-wind-react-impregnate technique. Critical issues are the selection of the fabric with which the conductor will be wrapped before winding, removal of the fabric sizing (which may leave carbon residue), suppression of oxygen in the heat-treatment vessel (because of the sensitivity of the Incoloy 908 conduit to cracking due to stress-accelerated grain-boundary oxidation) and full impregnation of the interstices of the windings for good structural and electrical insulation integrity. The challenge in this task is that all requirements must be met simultaneously. We report on the test programme to verify that the selected materials and processes will be successful when applied to fabrication of the final coils.
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