Vanadium oxide coatings to self-regulate current sharing in high-temperature superconducting cables and magnets

Yang, Zhenghuai; Araujo Martínez, Aurora Cecilia; Muley, Sachin V.; Wang, Xiaorong; Ji, Qing; Anders, André

doi:10.1063/5.0013783

Vanadium oxide coatings to self-regulate current sharing in high-temperature superconducting cables and magnets

Journal Article · Tue Aug 04 00:00:00 EDT 2020 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0013783· OSTI ID:1782160

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Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Harbin Inst. of Technology (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Guanajuato (Mexico)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Wisconsin, Madison, WI (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Leibniz Inst. of Surface Engineering (IOM) (Germany); Leipzig Univ. (Germany)

High-temperature superconductors such as REBa₂Cu₃O_7-δ (REBCO, RE = rare earth) enable high-current cables and high-field magnets. By removing the turn-to-turn insulation in a magnet application, recent experiments demonstrated that REBCO magnets can self-protect against catastrophic damage during a superconducting-to-normal transition (quench), i.e., when the stored magnetic energy rapidly converts to heat. The current can bypass the hot spot during a quench, thereby reducing the localized heat dissipation. The removal of the insulation between turns, however, leads to excessive eddy currents during current ramping, thereby forcing a much-prolonged magnet charging time. To address this issue, we investigate vanadium oxide (VO_x) coatings as a temperature-dependent self-switching medium that automatically manages current sharing. VO_x coatings (with 1.70 ≤ × ≤ to 2.07) were deposited by reactive cathodic arc deposition, initially on insulating glass to determine the electrical properties, and later on commercial REBCO tapes. The coatings are x-ray amorphous but with a short-range crystalline ordering according to Raman spectrometry. The resistivity of VO_x decreased by at least three orders of magnitude when the temperature increased from 80 to 300 K. The coating process is compatible with commercial REBCO tapes as evidenced by the negligible change in the critical current caused by the coating process. Here, the results from current sharing experiments and circuit analysis suggest that the VO_x coating can effectively self-regulate current sharing in REBCO magnets, suppress excessive eddy currents, and enable self-protection during quenches.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1782160

Alternate ID(s):: OSTI ID: 1644711

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 128; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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