Download e-book for kindle: Advances in Cryogenic Engineering Materials : Part A by K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)

By K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)

ISBN-10: 1461398800

ISBN-13: 9781461398806

ISBN-10: 1461398827

ISBN-13: 9781461398820

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To study this problem, the decay of the magnetization of multifilamentary conductors of NbTi and Nb 3 Sn have been measured as a function of time. Measurements show that as a function of Inc this decay cannot always be characterized by a single decay rate. Long time decay rates are sometimes approximately half that which is observed at short times < 1000 secs. STc' Results of this investigation are compared to sextupole field decay observed in magnets. INTRODUCTION In recent years, the problem of flux creep in type II superconductors has attracted attention following the observation of large time dependent magnetization decay in high Tc materia1 1 • However, this decay, which had been observed by early researchers 2 ,3 of type II superconductors did not generate much interest in traditional low Tc superconductors like NbTi, since the effect was small and well understood within the context of the critical state model 4 of critical currents and the Anderson5 theory of flux creep.

The critical current portion of the curve shows a smooth curvature due to random variations In device size. However, to further understand the behaviour of samples such as these, it is necessary to consider the underlying mechanisms of current transfer within multiply-connected weak link networks. The following sections describe a model for the resistive behaviour of such systems and will then show a quantitative comparison between the theoretical results and the experimental data. FLUX VORTEX PINNING ARRAYS The standard model of a weak link network consists of a rectangular network with identical microbridges or other weak links lying between each node.

L. Smith, Nature 320:124 (1986). 6. C. Johnston, H. H. Zachariasen, and V. Viswanathan, Mater. Res. Bull. 8:777 (1973). 7. W. L. E. Bierstedt, Solid State Commun. 17:27 (1975). 8. Z. M. Hermann, Nature 322:55 (1988). 9. W. Rev. B35:411 (1987). 10. J. W. Ashcroft, Phys. B27:5852 (1983). 11. V. L. Ginzburg, Com. Astrophys. & Space Phys. 1:81 (1969). 12. V. L. A. Kirzhnits, Sov. Phys. JETP 20:1346 (1965). 25 FLUX CREEP IN MULTIFILAHENTARY CONDUCTORS OF NbTi and Nb3Sn* A. K. Ghosh, Youwen Xu and M.

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Advances in Cryogenic Engineering Materials : Part A by K. Tachikawa (auth.), R. P. Reed, F. R. Fickett (eds.)

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