Abstract
The quench propagation in superconductors with changing current I(t) and/or placed into varying magnetic field B(t) is studied. The perturbations induced by I/spl dot/,B/spl dot/ may result in the thermomagnetical instability at quench current I/sub q/(I/spl dot/,B/spl dot/)<I/sub s/, where I/sub s/ is the critical current. It is shown that the interaction between the instability and the propagating normal zone leads to the acceleration of normal zone. The quench propagation velocity v increases sharply and the quench energy e/sub c/ tends to zero at I/spl sim/I/sub q/ or with increase of I/spl dot/,B/spl dot/. The effects of current sharing and the nonuniformities of superconductor on quench process are discussed. Analytical dependencies of v and e/sub c/ on I/spl dot/,B/spl dot/ are found and compared with the experiments.<<ETX>>
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