Multifilamentary MgB2 wires development for superconducting magnets

C. E. SOBRERO; M. T. MALACHEVSKY; A. C. SERQUIS

Buenos Aires

Conferencia; Lt 27; 2014

MgB2 has become a commercially attractive material for technological application due to its suitable superconducting properties. In this work grade 2 Titanium has been used as sheath material and several single and multifilamentary wires have been prepared using the Powder in Tube method with two variants: Ex situ and In situ. Several thermomechanical treatments were investigated in order to obtain an optimized wire. Once the fabrication method for the multifilamentary wires is optimized, several meters will be drawn to assemble a demonstration coil by the react-and-wind method. Bending tests must be performed on multifilamentary wires to determine the minimal radius that can be achieved with the coiltoavoid a significant degradation of the superconducting properties. Preliminary studies indicate that multifilamentary wires have a better performance in bending as they have a more favorable metal/superconductor ratio allowing for the fabrication of a smaller coil. Once the wire had been winded, the coil will be impregnated with epoxy resin with a low thermal expansion coefficient before measuring the magnetic field generated at the central zone. The properties of these superconducting cables may be suitable for low cost small magnets applications within cryocoolers, such as research lab measurements.