Abstract
Electrical Measurements were performed on two high-temperature superconducting coils made by American Superconductor Corporation. One coil measured 24-mm i.d., 59-mm o.d, 50-mm long, and used 85-m long Y-124 tape conductor. The other coil measured 29-mm i.d., 44-mm o.d., 43-mm long, and used 35-m long Bi-2223 tape conductor. We obtained V-I curves from room to helium temperature by using a variable temperature cryostat cooled by helium gas in external fields up to 4 T. Without an external field, the better performing Bi-2223 coil had a critical current, I c , of 14.1 A (2,820 A/cm2 over the conductor) at 4.2 K and 1.8 A (360 A/cm2) at 77 K. At 4 T, the I c was 4.9 A (980 A/cm2) at 4.2 K and 2.0 A (400 A/cm2) at 50 K. Reduced critical current, I c (B)/I c (0) vs. field plots indicated that a single smooth curve could fit all the data up to 50 K. The reduction in critical currents with external fields for the Y-124 coil was more than 80% at i T. For the Bi-2223 coil, it was about 42% at 1 T and about 61% at 4 T.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
S.W. Schwenterly, J.W. Lue, M.S. Lubell, J.N. Luton, and C.H. Joshi, Critical current measurements on Ag/Bi-Pb-Sr-Ca-Cu-O composite coils as a function of temperature and external magnetic field, IEEE Trans. Appl. Supercond. 3 (1): 949 (1993).
Z.L. Wang, J. Brynestad, D.M. Kroeger, Y.R. Sun, J.R. Thompson, and R.K. Williams, Grain-boundary chemistry and weak-link behavior of polycrystalline Y1Ba2Cu4O8, to be published in Phys. Rev. B 48 (1993).
A. Otto, L.J. Masur, J. Gannon, E. Podthurg, D. Daly, G.J. Yurek, and A.P. Malozemoff, Multi-filamentary Bi-2223 composite tapes made by a metallic precursor route, IEEE Trans. Appl. Supercond. 3 (1): 915 (1993).
A.P. Malozemoff, W. Carter, J. Gannon, C. Joshi, P. Miles, M. Minot, D. Parker, G. Riley, and E. Thompson, Progress in the development of bismuth-based high temperature superconducting tapes, Cryogenics, ICMC Supplement, 32: 478 (1992).
J.W. Ekin, D.K. Finnemore, Qiang Li, J. Tenbrink, and W. Carter, Effect of axial strain on the critical current of Ag-sheathed Bi-based superconductors in magnetic fields up to 25 T, Appl. Phys. Lett. 61: 858 (1992).
J.O. Willis, M.P. Maley, P.J. Kung, J.Y. Coulter, D.E. Peterson, P.G. Wahlbock, J.F. Bingert, and D. S. Phillips, Transport and magnetization critical current densities in T1Ba2Ca2Cu3Ox tapes, IEEE Trans. Appl. Supercond. 3 (1): 1219 (1993).
R. Wesche, B. Jakob, and G. Pasztor, Development and performance characteristics of Bi-2212/Ag superconducting wires, IEEE Trans. Appl. Supercond. 3 (l): 927 (1993).
A. Gladun, G. Fuchs, K. Fischer, D. Busch, R. Eujen, and J. Huedepohl, Critical current densities and activation energy of BiPbSrCaCuO tapes, IEEE Trans. Appl. Supercond. 3 (1): 1390 (1993).
C.E. Oberly, C.H. Joshi, A.J. Rodenbush, L.J. Long, and G. Kozlowski, Progress toward megawatt class superconducting generators which operate at greater than 20 Kelvin, to be published in “Advances in Cryogenic Engineering—Materials,” vol. 39, Plenum, New York (1994).
L.J. Masur, American Superconductor Corporation, Westborough, Massachusetts, unpublished research (1993).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1994 Springer Science+Business Media New York
About this chapter
Cite this chapter
Lue, J.W. et al. (1994). Test Results of Two Small, High-Temperature Superconducting Coils. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_43
Download citation
DOI: https://doi.org/10.1007/978-1-4757-9053-5_43
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-9055-9
Online ISBN: 978-1-4757-9053-5
eBook Packages: Springer Book Archive