Abstract
Long term decay of the sextupole field has been observed in accelerator dipole magnets, and this effect has been linked to “flux creep” in the superconductor. To study this problem, the decay of the magnetization of mult if ilamentary conductors of NbTi and Nb-Sn have been measured as a function of time. Measurements show that as a function of lnt 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. Creep rates are found to: (1) scale with filament diameter, (2) change slowly with field, (3) change rapidly as H is backed off from the critical state and (4) is fairly insensitive to temperature for 0.3TC < T < 0.8TC. Results of this investigation are compared to sextupole field decay observed in magnets.
Work done under the auspices of the U. S. Department of Energy
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References
Y. Yeshuran and A. P. Malozemoff, Phvs. Rev. Letts., 60: 2202 (1988).
Y. B. Kim, C. F. Hempstead and A. R. Strand, Phvs. Rev. Letts. 9:306 (1962)
M. R. Beasley, R. Labusch and W. W. Webb, Phvs. Rev., 181:682 (1969).
C. P. Bean, Phvs. Rev. Letts. 8:250 (1962).
P. W. Anderson, Phvs. Rev. Letts. 9:309 (1962).
D. A. Finley, D. A. Edwards, R. W. Hanft, R. Johnson, A. D. Mclnturff, and J. Strait, Proceeding of the 1987 IEEE Particle Accel. Conf., Washington, D.C., 151 (1987).
R. W. Hanft, B. C. Brown, D. A. Herrup, M. J. Lamm, A. D. Mclnturff and M. J. Syphers, IEEE Trans. on Magnetics 25: 1647 (1989).
D. A. Herrup, M. J. Syphers, D. E. Johnson, R. P. Johnson, A. V. Tollestrup, R. W. Hanft, B. C. Brown, M. J. Lamm, M. Kuchnir and A.D. Mclnturff, IEEE Trans. Magnetics 25: 1643 (1989).
W. S. Gilbert, R. F. Althaus, P. J. Barale, R. W. Benjegerdes, M. A. Green, M. I. Green and R. M. Scanlan, IEEE Trans. on Magnetics 25: 1459 (1989).
K. H. Mess and P. Schmüser, DESY report HERA 89–01 (1989).
M. Kuchnir and A. V. Tollestrup, IEEE Trans. on Magnetics 25: 1839 (1989).
Youwen Xu, M. Suenaga, A. R. Moodenbaugh and D. O. Welch, submitted to Phvs. Rev. (1989).
A. K. Ghosh and W. B. Sampson, IEEE Trans. on Magnetics 24: 1145 (1988).
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© 1990 Plenum Press, New York
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Ghosh, A.K., Xu, Y., Suenaga, M. (1990). Flux Creep in Multifilamentary Conductors of NbTi and Nb3Sn. In: Reed, R.P., Fickett, F.R. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 36. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9880-6_4
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DOI: https://doi.org/10.1007/978-1-4613-9880-6_4
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