Thermomagnetic instability evolution along a superconducting wire

TL;DR

This paper investigates the steady state propagation of magnetic perturbations caused by thermomagnetic instability in superconducting wires, revealing propagation velocities that vary with material and conditions.

Contribution

It provides experimental measurements of magnetic perturbation velocities in NbTi and NbZr superconducting wires under specific conditions, highlighting material-dependent differences.

Findings

Propagation velocity in NbTi wire: 2.5-3.5 km/sec

Propagation velocity in NbZr wire: over 9 km/sec

Steady state magnetic perturbation propagation is influenced by thermomagnetic instability

Abstract

Steady state propagation of a magnetic perturbation along a monofilament superconducting wire in circumstances of thermomagnetic instability was investigated. At temperature T=4.2K and magnetic field B=0.5-0.7T the propagation velocity is v = 2.5 - 3.5 km/sec in NbTi wire and this one exceeds a 9 km/sec in NbZr wire.