{"id":"doi:10.1038/s41598-019-46629-3","kind":"article","title":"Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2","authors":["Tengming Shen","Ernesto S. Bosque","Daniel Davis","Jianyi Jiang","Marvis White","Kai Zhang","Hugh C. Higley","Marcos Turqueti","Yibing Huang","Hanping Miao","Ulf Peter Trociewitz","E. E. Hellstrom","Jeff A. Parrell","A. Hunt","S.A. Gourlay","Soren O Prestemon","D. C. Larbalestier"],"author_count":17,"year":2019,"published":"2019-07-15","venue":"Scientific Reports","cited_by":76,"doi":"10.1038/s41598-019-46629-3","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1038/s41598-019-46629-3","archive_url":"https://space-kitty.com/papers/doi:10.1038/s41598-019-46629-3","updated":null,"pmid":"31308414","pmcid":null,"openalex_id":"W2956206921","pdf_url":"https://www.nature.com/articles/s41598-019-46629-3.pdf","abstract":"Abstract High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb 3 Sn, but two challenges have so far been the low engineering critical current density J E , 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 J E up to 950 A/mm 2 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 J E of 1020 A/mm 2 . Different from the unpredictable training performance of Nb-Ti and Nb 3 Sn 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, Nb 3 Sn, 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.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Superconducting Materials and Applications"],"details":null,"provenance":"openalex","attribution":"Abstract of \"Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2\" by Tengming Shen, Ernesto S. Bosque, Daniel Davis et al., https://doi.org/10.1038/s41598-019-46629-3, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified.","topics":[{"slug":"applied-superconductivity","name":"Applied Superconductivity & HTS Magnets","domain_slug":"superconductivity"}],"cited_in_dossiers":[]}