At the present time, NbsSn is the best superconductor candidate for the realization of high field magnets (>10-11 teslas). However its implementation remains delicate because of the great brittleness of material after the heat treatment necessary to form the NbsSn compounds. The conventional insulation for NbsSn wind & react coils requires performing, after the heat treatment, a vacuum resin impregnation, which adds to the cost and raises failure risk. We propose a one-step innovating ceramic insulation deposited directly on the un-reacted conducting cable. The conducting cable is wound according to conventional techniques and, after the heat treatment necessary to the form the NbsSn, we obtain a coil having a mechanical cohesion, while maintaining a proper conductor positioning and a suitable electric insulation. We will have studied the electric properties of superconducting cable isolated at the room temperature and at 4.2 K.
If Nb 3 Sn is the best superconductor candidate for the realization of high field magnets (for 10-11 Tesla), its implementation remains delicate because of the great brittleness of material after the heat treatment necessary for the formation of Nb 3 Sn compounds. The conventional insulation for Nb 3 SnWind & React coils requires performing, after the heat treatment, a vacuum resin impregnation, which adds to the cost and raises failure risk.We have proposed a one-step innovating ceramic insulation deposited directly on the un-reacted cable. After the heat treatment, we obtain a coil having a mechanical cohesion, while maintaining a proper conductor positioning and a suitable electric insulation.We have shown that using this insulation in a coil manufacturing process does not affect the electrical properties of the Nb 3 Sn wires. A solenoid of small dimensions (9 20 turns on an internal diameter of 22 mm) has produced a magnetic field of 3.8 T at 740 A. It was tested with success in high external magnetic fields: the quench limits have been imposed by the strand and the insulation was not damaged.
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