Development and Test of$rm Nb_3rm Sn rm Cos(theta)$Magnets Based on RRP and PIT Strands

As part of the High Field Magnet program at Fermilab three cos(Theta) magnets-two mirror dipole magnets utilizing RRP cable and one dipole magnet utilizing PIT cable-have been designed, fabricated and tested recently. Both mirror magnets with RRP strands only reached ~50-60% of their estimated critical current limit. The PIT conductor based dipole however reached its critical current limit producing over 10 T magnetic field in the bore of the magnet. This paper describes the parameters of superconducting strands and cable, the details of magnet design and fabrication procedure, and reports the results