Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2
| Autor: | Hugh Higley, Stephen A. Gourlay, Eric E. Hellstrom, Kai Zhang, Andrew Hunt, Soren Prestemon, Tengming Shen, Ulf P. Trociewitz, Daniel Davis, Marcos Turqueti, Ernesto Bosque, Y. Huang, Marvis White, Jianyi Jiang, Jeffrey A. Parrell, Hanping Miao, David C. Larbalestier |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
cond-mat.supr-con Materials science Thermal runaway lcsh:Medicine Superconducting magnet 03 medical and health sciences 0302 clinical medicine Thermal lcsh:Science physics.acc-ph Superconductivity Rutherford cable Multidisciplinary business.industry lcsh:R Conductor Other Physical Sciences 030104 developmental biology Magnet Optoelectronics lcsh:Q Biochemistry and Cell Biology business Current density 030217 neurology & neurosurgery |
| Zdroj: | Scientific reports, vol 9, iss 1 Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019) |
| ISSN: | 2045-2322 |
| Popis: | High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb3Sn, but two challenges have so far been the low engineering critical current density JE, especially in high-current cables, and the danger of quenches. Most HTS magnets made so far have been made out of REBCO coated conductor. Here we demonstrate stable, reliable and training-quench-free performance of Bi-2212 racetrack coils wound with a Rutherford cable fabricated from wires made with a new precursor powder. These round multifilamentary wires exhibited a record JE up to 950 A/mm2 at 30 T at 4.2 K. These coils carried up to 8.6 kA while generating 3.5 T at 4.2 K at a JE of 1020 A/mm2. Different from the unpredictable training performance of Nb-Ti and Nb3Sn magnets, these Bi-2212 magnets showed no training quenches and entered the flux flow state in a stable manner before thermal runaway and quench occurred. Also different from Nb-Ti, Nb3Sn, and REBCO magnets for which localized thermal runaways occur at unpredictable locations, the quenches of Bi-2212 magnets consistently occurred in the high field regions over a long conductor length. These characteristics make quench detection simple, enabling safe protection, and suggest a new paradigm of constructing quench-predictable superconducting magnets from Bi-2212. |
| Databáze: | OpenAIRE |
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