Analytical method to calculate the quench energy of a superconductor carrying a transport current

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• 作者：Buznikov ; N.A. ; Pukhov ; A.A.
• 关键词：superconductivity ; thermal disturbances ; quench energy
• 刊名：Cryogenics
• 出版年：1996
• 出版时间：July, 1996
• 年：1996
• 卷：36
• 期：7
• 页码：547-553
• 全文大小：642 K

文摘

The dynamics of the normal zone initiated by a local heat pulse in a superconductor carrying a transport current is studied theoretically. An approximate method is considered, from which analytical formulae are obtained for the minimum heat pulse energy E_c required to destroy the superconductivity. The method described allows analytical results for E_c available up to now to be generalized and also new ones to be obtained. Different models of Joule self-heating in a superconductor are considered. Analytical formulae for the dependencies of the quench energy E_c on the current densityj are obtained for one-, two- and three-dimensional heat propagation under adiabatic conditions. The influence of heat transfer to the coolant on the quench energyE_c is discussed. The analytical results are confirmed by a direct numerical simulation of the normal zone dynamics. The results obtained may be of importance for studying the cryostability of both conventional and high-temperature superconductors.