Experimental Results on the Development of Superconducting NbTi/Cu-Mn/Cu Wires for Magnet Systems of SIS100 and SIS300 Synchrotrons of FAIR

Experimental prototype wires with low AC losses intended for the use in the magnet systems of the SIS100 and SIS300 synchrotrons of FAIR have been fabricated and investigated. A wide database on J
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and AC losses has been obtained for the wires that have a 3-4 micron filament diameter and a Cu-0.5 % Mn interfilament matrix. Cable samples based on these wires have been fabricated and AC losses have been measured. Recent results are presented for the performance of NbTi/Cu-Mn/Cu wires of new designs with 0.5 mm, 0.79 mm and 0.825 mm in diameter.