TY - JOUR
T1 - Field dependence of the critical current and its relation to the anisotropy of BSCCO conductors and coils
AU - Weijers, H. W.
AU - Ten Haken, B.
AU - Ten Kate, H. H.J.
AU - Schwartz, J.
N1 - Funding Information:
Manuscript received October 4, 2004. This research is supported in part by the NSF and the State of Florida under cooperative grant DMR 0084173. H. W. Weijers is with the National High Magnetic Field Laboratory, Tallahassee, FL 32310 USA (e-mail: [email protected]). B. ten Haken and H. H. J. ten Kate are with the Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands (e-mail: [email protected]; [email protected]). J. Schwartz is with the National High Magnetic Field Laboratory, Tallahassee, Fl 32310 USA. He is also with the Dept. of ME, FAMU-FSU College of Engineering, Tallahassee, FL 32310 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/TASC.2005.847650
PY - 2005/6
Y1 - 2005/6
N2 - The design of HTS magnets is often based on the properties of a number of short samples that are presumed to be representative of the conductor to be used. Variability in conductor properties and inhomogeneity in the magnetic field distribution within the magnets, coupled with conductor anisotropy, provide a significant challenge to accurately predict the field dependence of the magnet critical current. This work is based on measured superconducting properties of Bi-2212 and Bi-2223 conductors at 4.2 K in parallel and perpendicular magnetic fields up to 33 T. Properties of double pancake units and stacks, from the same or similar conductor batches, are presented, based on measurements at self-field and in applied co-axial background magnetic fields up to 19 T. Modeling of this data is based on short sample properties in perpendicular field; the average grain misalignment is used as the parameter to quantify the anisotropy. Correlations and discrepancies between the measured data and models based on short sample data are discussed for Bi-2212 and Bi-2223 conductors.
AB - The design of HTS magnets is often based on the properties of a number of short samples that are presumed to be representative of the conductor to be used. Variability in conductor properties and inhomogeneity in the magnetic field distribution within the magnets, coupled with conductor anisotropy, provide a significant challenge to accurately predict the field dependence of the magnet critical current. This work is based on measured superconducting properties of Bi-2212 and Bi-2223 conductors at 4.2 K in parallel and perpendicular magnetic fields up to 33 T. Properties of double pancake units and stacks, from the same or similar conductor batches, are presented, based on measurements at self-field and in applied co-axial background magnetic fields up to 19 T. Modeling of this data is based on short sample properties in perpendicular field; the average grain misalignment is used as the parameter to quantify the anisotropy. Correlations and discrepancies between the measured data and models based on short sample data are discussed for Bi-2212 and Bi-2223 conductors.
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U2 - 10.1109/TASC.2005.847650
DO - 10.1109/TASC.2005.847650
M3 - Article
AN - SCOPUS:22144437341
SN - 1051-8223
VL - 15
SP - 2558
EP - 2561
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2 PART III
ER -