High Performance Bi-2212 Round Wires Made with Recent Powders.

Autor: Jiang J; Applied Superconductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Bradford G; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Hossain SI; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Brown M; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Cooper J; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Miller E; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Huang Y; Bruker OST, Carteret, NJ 07008, USA., Miao H; Bruker OST, Carteret, NJ 07008, USA., Parrell JA; Bruker OST, Carteret, NJ 07008, USA., White M; nGimat LLC, 2436 Over Dr. Lexington, KY 40511, USA., Hunt A; nGimat LLC, 2436 Over Dr. Lexington, KY 40511, USA., Sengupta S; MetaMateria, 870 Kaderly Dr, Columbus, OH 43228, USA., Revur R; MetaMateria, 870 Kaderly Dr, Columbus, OH 43228, USA., Shen T; Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Kametani F; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Trociewitz UP; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Hellstrom EE; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University., Larbalestier DC; Applied Super-conductivity Center, National High Magnetic Laboratory, Tallahassee, FL 32310, USA and also with Florida State University.
Jazyk: angličtina
Zdroj: IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee [IEEE Trans Appl Supercond] 2019 Aug; Vol. 29 (5). Date of Electronic Publication: 2019 Jan 24.
DOI: 10.1109/TASC.2019.2895197
Abstrakt: Multifilamentary Bi 2 Sr 2 CaCu 2 O x (Bi-2212) wire made by the powder-in-tube technique is the only high temperature superconductor made in the round shape preferred by magnet builders. The critical current density ( J C ) of Bi-2212 round wire was improved significantly by the development of overpressure heat treatment in the past few years. Bi-2212 wire is commercially available in multiple architectures and kilometer-long pieces and a very promising conductor for very high field NMR and accelerator magnets. We studied the effects of precursor powder and heat treatment conditions on the superconducting properties and microstructure of recent Bi-2212 wires. Short samples of recent wire with optimized overpressure processing showed J C (4.2 K, 15 T) = 6640 A/mm 2 and J C (4.2 K, 30 T) = 4670 A/mm 2 , which correspond to engineering critical current densities J E (4.2 K, 15 T) = 1320 A/mm 2 and J E (4.2 K, 30 T) = 930 A/mm 2 .
Databáze: MEDLINE
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