Abstract
The quench current of a superconducting magnet, Iq, is the current at which a thermal runaway occurs. In trained LTS magnets Iq can be estimated from a short sample critical current, Ic, due to a steep electric field (E)–current density (J) characteristic. Anisotropy and the slanted E(J)-characteristic make the situation more complicated in HTS magnets. Furthermore, the Iq of a conduction-cooled magnet depends strongly on the geometry of the thermal interface. Several criteria, such as the average electric field of 0.1 μV cm−1 and the maximum electric field of 1 μV cm−1 have been suggested for Iq of an HTS magnet. However, in order to determine Iq accurately a detailed stability analysis is required. In this paper different Iq criteria for conduction-cooled HTS magnets are computationally compared at the operation temperatures of 4.2, 20 and 77 K. Computations are based on the Ic data measured with a Bi-2223/Ag tape. 150 different solenoidal magnets having the wire length of 2, 5 and 10 km have been studied. The effect of the thermal interface geometry on Iq has also been investigated. Rules of thumb for the quick estimation of Iq at the given operation temperature are suggested.
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