Stability of a length of cable-in-conduit conductor submitted to a rapidly changing field

The authors present a stability experiment on a NbTi triplet in conduit conductor, 10 m long. This cable was cooled with helium forced flow. An inductive heating system allows deposition of large heat quantities over the whole length of the conductor. In one experiment, the AC losses of the conductor were calibrated by measuring the dissipated energy in a superfluid helium bath, for different magnetic field variations and pulse durations. In another experiment, with supercritical helium, the minimum energy needed to quench the conductor in relation to the transport current, for a given external magnetic field and given refrigeration conditions, will be studied. The results of the first experiment are given, and the second experiment is described.<
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