Stability Measurements of a Superconductor Cooled By a Two-Dimensional Channel of Helium II
This report presents measurements on the stability of a He II cooled superconductor. The conductor is helically wound in a phenolic coil support and is cooled by a channel of He II which allows for heat transfer in two dimensions. Stability is measured by recovery of the superconducting state following a transient burst of heat. The data also allows one to measure normal zone propagation velocities and temperature profiles at various times. Currents in the conductor range from 0 to 5 kA with background magnetic field ranging from 0 to 11 tesla. Descriptions of stability boundaries are given in terms of maximum energy bursts from which the conductor recovers as a function of transport current, channel size and background field. Comparisons of the data with an analysis of stability in a one-dimensional channel are shown to be useful. This experimental configuration is intended to model some aspects of a superconducting magnetic energy storage system.
KeywordsEnthalpy Helium Epoxy Resis Refrigeration
Unable to display preview. Download preview PDF.
- 1.R. W. Boom et al., “Wisconsin Superconductive Energy Storage Report,” Vol. 1, University of Wisconsin, Madison, Wisconsin (1973).Google Scholar
- 4.L. Dresner, A rapid, semi-empirical method for calculating the stability margins of superconductors cooled with subcooled He-II, (private communication, 1984 ).Google Scholar
- 5.C. Meuris, Experimental study of the stability of a superconductor cooled by a limited volume of superfluid helium, IEEE Trans. Mag. MAG-19(3 ):272 (1983).Google Scholar
- 6.Y. M. Eyssa et al., Two-layer solenoids for superconductive magnetic energy storage (SMES), in: “Advances in Cryogenic Engineering,” Vol. 31, Plenum Press, New York, (1986).Google Scholar
- 7.P. L. Kapitza, The study of heat transfer in Helium II, J. Phys. USSR 4:181 (1941).Google Scholar