Bi-2212 Round Wire Development for High Field Applications
- 6 September 2013
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
- Vol. 24 (3), 1-5
- https://doi.org/10.1109/tasc.2013.2281063
Abstract
Oxford Superconducting Technology continuously improves Bi-2212 round wire performance because this product has a unique property for ultra high-field magnet ( 25 T) applications. Our recent results on improving the engineering current density by filament densification and reducing trace carbon and hydrogen contamination are presented. The swaging, isostatic pressing, and over-pressure heat treatment processes have been demonstrated to effectively increase the Bi-2212 filament mass density in the final wire and results in high performance over long wire length. Engineering current density values exceeding 550 A/mm2 at 4.2 K, 15 T have been achieved on 1-m-long barrel samples. Several configurations have been developed to meet different operating current requirements with optimum filament size ( ~ 15 micron) on critical current density, Jc. The round wire has also been twisted down to 12 mm in twist pitch length without performance degradation.Keywords
Funding Information
- DOE-HEP
- CDP
- VHSMC
- SBIR
- DOE
- NSF
This publication has 18 references indexed in Scilit:
- Role of internal gases and creep of Ag in controlling the critical current density of Ag-sheathed Bi2Sr2CaCu2Ox wiresJournal of Applied Physics, 2013
- Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wiresSuperconductor Science and Technology, 2013
- Development of Bi-2212 round wires for high field magnet applicationsAIP Conference Proceedings, 2012
- Doubled critical current density in Bi-2212 round wires by reduction of the residual bubble densitySuperconductor Science and Technology, 2011
- Evidence for long range movement of Bi-2212 within the filament bundle on melting and its significant effect onJcSuperconductor Science and Technology, 2011
- Bubble formation within filaments of melt-processed Bi2212 wires and its strongly negative effect on the critical current densitySuperconductor Science and Technology, 2011
- The Development of High Field Magnets Utilizing Bi-2212 Wind & React Insert CoilsIEEE Transactions on Applied Superconductivity, 2010
- MICROSTRUCTURE AND Jc IMPROVEMENTS IN MULTIFILAMENTARY Bi-2212∕Ag WIRES FOR HIGH FIELD MAGNET APPLICATIONSAIP Conference Proceedings, 2008
- Studies of Precursor Composition Effect on Jc in Bi-2212/Ag Wires and TapesAIP Conference Proceedings, 2006
- Study of powder density, Ag:superconductor ratio, and microhardness of BSCCO-2212 Ag-sheathed wires and tapes during wire drawing and rollingIEEE Transactions on Applied Superconductivity, 1995