Flux jumps under time-dependent external conditions

Abstract

Abstract. The paper investigates the influence of the time-dependent external conditions on the stability criterion of the critical state in a hard superconductor with respect to flux jumps. It has been shown that the existence of a non-linear region in the currentvoltage characteristic can result in a significant delay of the onset of the instability. The methods developed in this paper make it possible to define the dependence of the stability criterion on the rate of change of the external parameters (magnetic field, temperature etc). The theoretical results have been compared with the experimental data.

Magnetothermal instabilities in type II superconductors

“…The influence of the time-dependent external conditions on the stability threshold of the critical state for hard type-II superconductors has been studied theoretically by Mints and Rakhmanov [28]. They found a stability criterion of the critical state as a function of the rate of variation of the external magnetic field and the external temperature in hard superconductors.…”