Abstract
IMP (Injection into Microwave Plasma) is a fusion research device which will utilize a superconducting mirror-quadrupole magnet system. The NbTi mirror coils have been built and tested to short sample performance at 60 kG with 104 A/cm2 over-all. Designs of the quadrupole system using NbTi at 8500 A/cm2, or alternatively using Nb3Sn at 13 500 A/cm2, have been examined. Anticipated conductor costs favor NbTi, even though the volume of Nb3Sn is significantly less. However, some details of construction suggest that Nb3Sn would result in easier winding and possibly more reliable operation. Details of these comparisons were given, along with discussions of electrical stability and other technical differences in the two approaches.
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