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Title: Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm 2

Abstract

High-temperature superconductors (HTS) could enable high-field magnets stronger than is possible with Nb-Ti and Nb 3Sn, 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 3Sn 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 3Sn, 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 safemore » protection, and suggest a new paradigm of constructing quench-predictable superconducting magnets from Bi-2212.« less

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [4];  [1];  [1];  [1];  [5];  [5];  [2];  [2];  [5];  [4];  [1];  [1]; ORCiD logo [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Florida State Univ., Tallahassee, FL (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Florida State Univ., Tallahassee, FL (United States)
  4. nGimat LLC, Lexington, KY (United States)
  5. Bruker OST LLC, Carteret, NJ (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1559235
Grant/Contract Number:  
AC02-05CH11231; SC0010421; SC0009705
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Shen, Tengming, Bosque, Ernesto, Davis, Daniel, Jiang, Jianyi, White, Marvis, Zhang, Kai, Higley, Hugh, Turqueti, Marcos, Huang, Yibing, Miao, Hanping, Trociewitz, Ulf, Hellstrom, Eric, Parrell, Jeffrey, Hunt, Andrew, Gourlay, Stephen, Prestemon, Soren, and Larbalestier, David. Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2. United States: N. p., 2019. Web. doi:10.1038/s41598-019-46629-3.
Shen, Tengming, Bosque, Ernesto, Davis, Daniel, Jiang, Jianyi, White, Marvis, Zhang, Kai, Higley, Hugh, Turqueti, Marcos, Huang, Yibing, Miao, Hanping, Trociewitz, Ulf, Hellstrom, Eric, Parrell, Jeffrey, Hunt, Andrew, Gourlay, Stephen, Prestemon, Soren, & Larbalestier, David. Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2. United States. doi:10.1038/s41598-019-46629-3.
Shen, Tengming, Bosque, Ernesto, Davis, Daniel, Jiang, Jianyi, White, Marvis, Zhang, Kai, Higley, Hugh, Turqueti, Marcos, Huang, Yibing, Miao, Hanping, Trociewitz, Ulf, Hellstrom, Eric, Parrell, Jeffrey, Hunt, Andrew, Gourlay, Stephen, Prestemon, Soren, and Larbalestier, David. Mon . "Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2". United States. doi:10.1038/s41598-019-46629-3. https://www.osti.gov/servlets/purl/1559235.
@article{osti_1559235,
title = {Stable, predictable and training-free operation of superconducting Bi-2212 Rutherford cable racetrack coils at the wire current density of 1000 A/mm2},
author = {Shen, Tengming and Bosque, Ernesto and Davis, Daniel and Jiang, Jianyi and White, Marvis and Zhang, Kai and Higley, Hugh and Turqueti, Marcos and Huang, Yibing and Miao, Hanping and Trociewitz, Ulf and Hellstrom, Eric and Parrell, Jeffrey and Hunt, Andrew and Gourlay, Stephen and Prestemon, Soren and Larbalestier, David},
abstractNote = {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.},
doi = {10.1038/s41598-019-46629-3},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {7}
}

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