Abstract
Nb+25% Zr wires of several sizes and critical current densities were placed in a longitudinal magnetic field at 4.2°K, and persistent eddy currents were induced in them by changing the magnetic field strength. In the absence of any transport current it was found that a decay of these stored currents started at one point in the wire would propagate along the wire length. Decay was generally initiated by small pulses of heat, but would also start spontaneously under certain conditions. The velocity of propagation ranged from 105 to 106 cm/sec depending upon the wire and field strength during the experiment. Analysis of the flux change within the wire suggests an electromagnetically controlled propagation mechanism.
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