Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 30, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/30/1/014006
Keywords
coated conductors; exfoliation; cable
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Funding
- Department of Energy, Office of High Energy Physics under Small Business Innovation Research (SBIR) Phase I award [DE-SC0013856]
- U.S. Department of Energy (DOE) [DE-SC0013856] Funding Source: U.S. Department of Energy (DOE)
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The second-generation high temperature superconductor (2G HTS) wire is the most promising conductor for high-field magnets such as accelerator dipoles and compact fusion devices. The key element of the wire is a thin Y1Ba2Cu3O7 (YBCO) layer deposited on a flexible metal substrate. The substrate, which becomes incorporated in the 2G conductor, reduces the electrical and mechanical performance of the wire. This is a process that exfoliates the YBCO layer from the substrate while retaining the critical current density of the superconductor. Ten-centimeter long coupons of exfoliated YBCO layers were manufactured, and detailed structural, electrical, and mechanical characterization were reported. After exfoliation, the YBCO layer was supported by a 75 mu m thick stainless steel foil, which makes for a compact, mechanically stronger, and inexpensive conductor. The critical current density of the filaments was measured at both 77 K and 4.2 K. The exfoliated YBCO retained 90% of the original critical current. Similarly, tests in an external magnetic field at 4.2 K confirmed that the pinning strength of the YBCO layer was also retained following exfoliation.
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