Stability of superconductors against localized disturbances of limited magnitude

Wilson, M.N.; Iwasa, Y.

doi:10.1016/0011-2275(78)90132-7

Cited by 94 publications

(19 citation statements)

References 7 publications

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“…There have been several studies (Wipf and Martinelli 1973, Wilson and Iwasa 1978, Wipf 1979 aimed at relating J, of bulk superconductors to the concept of a minimum propagating zone (MPZ). The MPZ is the minimum length of a normal zone in a superconductor which will thermally propagate and thus quench superconductivity.…”

Section: Le Stability Of Critical Current Densitymentioning

confidence: 99%

Thermal propagation and stability in superconducting films

Kampwirth

Zasadzinski

Ducharme

1983

J. Phys. F: Met. Phys.

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Abstract. Thermal propagation and stable hot spots (normal domains) are studied in various high T, superconducting films (NblSn, Nb, NbN and NbjGe). The prediction of the thermal propagation velocity of the long-standing model of Broom and Rhoderick is verified quantitatively in the regime of its validity. A new energy balance model is shown to give reasonable quantitative agreement of the dependence of the propagation velocity on the length of short normal domains. The steady state (zero velocity) measurements indicate the existence of two distinct situations for films on high thermal conductivity (sapphire) substrates. For low power per unit area the film and substrate have the same temperature, and the thermal properties of the substrate dominate. However, for higher power densities in short hot spots, the coupling is relatively weak and the thermal properties of the film alone are important. Here a connection is made between the critical current stability of superconducting films and a critical hot spot size for thermal propagation. As a result efficient heat removal is shown to dominate the stabilisation of superconducting films. The strong and weak coupling situations also lead to modifications of the models for propagation velocities on sapphire substrates. These models are used to explain quantitatively self-healing of hot spots and a curious switching phenomena in a superconducting film in which a hot spot grows and collapses repeatedly over a very narrow range of current. Finally there is a discussion of the potential use of the thermal propagation model in applications of superconductors, especially switches.

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Section: Le Stability Of Critical Current Densitymentioning

confidence: 99%

Thermal propagation and stability in superconducting films

Kampwirth

Zasadzinski

Ducharme

1983

J. Phys. F: Met. Phys.

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“…Specific results which are of particular interest to the long range MHD magnet program are: * Application of the minimum propagating zone and critical current margin theories in analyzing superconductor stability [21].…”

Section: Resultsmentioning

confidence: 99%

“…When the current is above this limit, the maximum recovery current is directly related to the maximum energy the conductor can absorb and still recover. The unstable equilibrium state corresponding to this energy is called a minimum propagating zone (MPZ), and the theory which treats it is called the minimum propagating zone theory [60B]; [21].…”

Section: Stability Analysis Of High Current Conductorsmentioning

confidence: 99%

MHD magnet technology development program summary, September 1982

Becker¹,

Bobrov²,

Davin³

et al. 1983

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“…Wilson and Iwasa [9] suggested that Wilson's MPZ can evolve from several original disturbances: short ones with high peak temperatures or long ones with moderate temperature rises. Their idea is visualized in Fig.…”

Section: Examplesmentioning

confidence: 99%

“…Their idea is visualized in Fig. 5 according to [9]. In the following, it was necessary to replace T c with T cs in (1), because of the large differences between the operation and critical temperatures of MgB 2 .…”

Section: Examplesmentioning

confidence: 99%