TY - JOUR
T1 - High field insert coils from Bi-2212/Ag round wires
AU - Miao, Hanping
AU - Marken, Kenneth R.
AU - Meinesz, Maarten
AU - Czabaj, Boleslaw
AU - Hong, Seung
AU - Twin, Andrew
AU - Noonan, Paul
AU - Trociewitz, Ulf P.
AU - Schwartz, Justin
N1 - Funding Information:
Manuscript received August 28, 2006. A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by NSF Cooperative Agreement DMR-0084173, by the State of Florida, and by the DOE. A portion of this work was funded by DOE Financial Assistance Award DE-FC36-02GO11103. H. Miao, M. Meinesz, B. Czabaj, and S. Hong are with Oxford Instruments, Superconducting Technology, Carteret, NJ 07008 USA (e-mail: [email protected]). K. R. Marken is now with Los Alamos National Laboratory, Los Alamos, NM 87545 USA. A. Twin and P. Noonan are with Oxford Instruments NanoScience, Oxford-shire OX29 4TL, U.K. U. P. Trociewitz and J. Schwartz are with the National High Magnetic Field Laboratory, Tallahassee, FL 32310 USA. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2007.898999
PY - 2007/6
Y1 - 2007/6
N2 - Bi-2212/Ag round wire is a promising and practical material for extending high field superconducting magnets beyond the limits of Nb3Sn. Efforts to develop superconducting magnets in the 25 to 30 T range include fabrication and test of practical size insert coils using this wire. Recent studies have focused on improvements in wire performance, wire insulation, and coil fabrication for wind-and-react coils. Continued improvements in the engineering critical current density (JE) and the critical current density (Jc) performance have been achieved by optimizing the starting precursor composition, and the heat treatments. The highest J E of 1580 A/mm2 at 4.2 K, 0 T and 420 A/mm2 at 4.2 K, 31 T were obtained in 0.81 mm wire. In particular, significant progress on braided insulation has been made for enabling a robust procedure for wind-and-react Bi-2212 solenoid coils. Performance of three of these coils has been measured in background fields up to 19 T, showing good prospects for high field magnet application of this conductor.
AB - Bi-2212/Ag round wire is a promising and practical material for extending high field superconducting magnets beyond the limits of Nb3Sn. Efforts to develop superconducting magnets in the 25 to 30 T range include fabrication and test of practical size insert coils using this wire. Recent studies have focused on improvements in wire performance, wire insulation, and coil fabrication for wind-and-react coils. Continued improvements in the engineering critical current density (JE) and the critical current density (Jc) performance have been achieved by optimizing the starting precursor composition, and the heat treatments. The highest J E of 1580 A/mm2 at 4.2 K, 0 T and 420 A/mm2 at 4.2 K, 31 T were obtained in 0.81 mm wire. In particular, significant progress on braided insulation has been made for enabling a robust procedure for wind-and-react Bi-2212 solenoid coils. Performance of three of these coils has been measured in background fields up to 19 T, showing good prospects for high field magnet application of this conductor.
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U2 - 10.1109/TASC.2007.898999
DO - 10.1109/TASC.2007.898999
M3 - Article
AN - SCOPUS:34547461693
SN - 1051-8223
VL - 17
SP - 2262
EP - 2265
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 2
ER -