V. E. Keilin, I. A. Kovalev, S. L. Kruglov, D. I. Shutova, V. I. Shcherbakov, “Considerable increase in the thermomagnetic stability of multifilament superconductors internally doped by large-heat-capacity substances”, Zhurnal Tekhnicheskoi Fiziki, 2010, Volume 80, Issue 2,Pages <nobr>155

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Considerable increase in the thermomagnetic stability of multifilament superconductors internally doped by large-heat-capacity substances

V. E. Keilin, I. A. Kovalev, S. L. Kruglov, D. I. Shutova, V. I. Shcherbakov

Russian Research Centre "Kurchatov Institute", Moscow

Abstract: It is demonstrated that the thermomagnetic stability of composite superconductors can be considerably increased by introducing into them a small quantity of a material with an extremely high specific heat at low temperatures. Measurements show that the criterion of “adiabatic” stability for a (Nb$_3$Sn + 7 vol.% PrB$_6$) wire is 70% higher than for a reference Nb$_3$Sn wire (at 4.2 K, the specific heat of the doped sample is seven times higher than that of the reference sample). For a (NbTi + 5vol.% Gd$_2$O$_2$S) sample, the specific heat of which at 4.2 K is nine times higher than that of a reference NbTi wire, this increase in stability is as small as 10% (because the characteristic thermal time in the transverse direction is much longer than the time of the magnetic flux jump development).

Received: 14.07.2009