Persistent Current-induced Harmonics(may be a problem in Nb3Sn magnets, if nothing is done)

Garber, Ghosh and Sampson (BNL)

Persistent current induced magnetization :

Nb3Sn, with the technology under use now, is expected to generate persistent current-induced harmonics

which are a factor of 10-100 worse than those measured in Nb-Ti magnets. In addiction,

a snap-back problem is observed when the acceleration starts after injection at steady state (constant field).

Measured sextupole

harmonic in Nb-Ti magnet

Measured sextupole

harmonic in Nb3Sn magnet

Measured magnetization

Exploring the unusual options for the major cost savings while improving the performance.

Magnet/machine designs to accommodate challenging superconductors.

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