Thermal propagation of normal zone with increasing temperature level in helium-cooled and high temperature superconductors

✍ Scribed by Yu.M. Lvovsky

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 960 KB
• Volume: 30
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(90)90272-e

✦ Synopsis

Normal zone propagation is investigated above the maximum equilibrium current I*, where a superconductor has no stable state in the normal region. This monostable thermal wave is shown to have constant front velocity although its crest grows infinitely with time. Various monostable regimes are analysed by numerical simulation of zone propagation both in heliumcooled and in high T c superconductors (HTSC), and the velocity-current dependences are obtained. Unlike in HTSC, transition to monostable propagation in helium-cooled superconductors is accompanied by jump in velocity at I = I*. A constant coefficient model for HTSC is presented which gives analytical expressions for monostable zone velocity. Over a wide range of currents the velocity is given by universal formula dependent on normal substrate

properties only. The effect of transient heat transfer is analysed.