| Preprint | |
| Report number | arXiv:1305.1269 |
| Title | A transformative superconducting magnet technology for fields well above 30 T using isotropic round wire multifilament $Bi_2Sr_2CaCu_2O_{8-x}$ conductor |
| Author(s) | Larbalestier, D.C. (Natl. High Mag. Field Lab.) ; Jiang, J. (Natl. High Mag. Field Lab.) ; Trociewitz, U.P. (Natl. High Mag. Field Lab.) ; Kametani, F. (Natl. High Mag. Field Lab.) ; Scheuerlein, C. (CERN) ; Dalban-Canassy, M. (Natl. High Mag. Field Lab.) ; Matras, M. (Natl. High Mag. Field Lab.) ; Chen, P. (Natl. High Mag. Field Lab.) ; Craig, N.C. (Natl. High Mag. Field Lab.) ; Lee, P.J. (Natl. High Mag. Field Lab.) ; Hellstrom, E.E. (Natl. High Mag. Field Lab.) |
| Publication | 2013 |
| Imprint | 2013-05-06 |
| Number of pages | 14 |
| Note | 14 pages including 6 figures |
| Subject category | cond-mat.supr-con ; cond-mat.supr-con ; Physics in General |
| Abstract | We report here that magnetic fields of almost 34 T, far above the upper 24 T limit of Nb3Sn, can be generated using a multifilament round wire conductor made of the high temperature cuprate superconductor Bi2Sr2CaCu2O8-x (Bi-2212). A remarkable attribute of this Bi-2212 conductor is that it does not exhibit macroscopic texture and contains many high angle grain boundaries but nevertheless attains very high superconducting critical current densities Jc of 2500 A/mm2 at 20 T and 4.2 K. This Bi-2212 conductor does not possess the extreme texture that high Jc coated conductors of REBa2Cu3O7-x (REBCO) require, avoiding also its high aspect ratio, large superconducting anisotropy and the inherent sensitivity to defects of a single filament conductor. Bi-2212 wires can be wound or cabled into almost any type of superconducting magnet and will be especially valuable for very high field NMR magnets beyond the present 1 GHz proton resonance limit of Nb3Sn technology. This demonstration that grain boundary limits to high Jc can be practically overcome suggests the huge value of a renewed focus on grain boundary properties in non-ideal geometries, especially with the goal of translating the lessons of this Bi-2212 conductor into fabrication of multifilament round wire REBCO or Fe-based superconductors. |
| Other source | Inspire |
| Copyright/License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Zapis kreiran 2015-03-25, zadnja izmjena 2022-03-17
