Measurements of the Strain Dependence of Critical Current of Commercial REBCO Tapes at 15 T Between 4.2 and 40 K for High Field Magnets

Pierro, Federica; Delgado, Mario; Chiesa, Luisa; Wang, Xiaorong; Prestemon, Soren O.

doi:10.1109/tasc.2019.2902458

Title: Measurements of the Strain Dependence of Critical Current of Commercial REBCO Tapes at 15 T Between 4.2 and 40 K for High Field Magnets

Journal Article · Fri Mar 01 00:00:00 EST 2019 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2019.2902458· OSTI ID:1510773

^[1]; Delgado, Mario ^[2];

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Tufts Univ., Medford, MA (United States). Mechanical Engineering Dept.
Tufts Univ., Medford, MA (United States). Physics Dept.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Interest for high magnetic fields (>16 T) for applications in high energy physics (HEP) and fusion machines, requires the development of high current cables capable to withstand the large forces, mechanical and electromagnetic, experienced during manufacturing and operations. The critical current (I _c ) of REBCO tapes depends on strain, magnetic fields, and operational temperatures. Understanding how these parameters affect the I _c of the conductor will be critical to develop robust high-current REBCO cables. However, there are limited reports on the strain dependence of I _c , in particular at high fields and elevated temperatures relevant for future high-field compact fusion reactor magnets. We present here I _c of commercial REBCO tapes measured as a function of compressive and tensile strain (between -0.6% and +0.65%) at high magnetic fields (12 and 15 T) and different temperatures (within 4.2-40 K). Results at 4.2 and 20 K showed less than 5% reduction in the normalized I _c at high strain, while a stronger strain dependence was observed at 40 K. Samples tested at 12 T and 4.2 K showed similar strain dependence as 15 T and 4.2 K. In all tested conditions, the tape experienced reversible I _c reduction in both tension and compression. Finite element analysis was used to predict the residual thermal strain accumulated in the REBCO layer prior of testing to account for the effect of the cooldown. A method was also developed to account for the current sharing observed between the sample and the sample holder during the ramp of the current. Our results provide useful input for the development of high-field fusion and HEP magnets using REBCO conductors.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Tufts Univ., Medford, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1510773

Journal Information:: IEEE Transactions on Applied Superconductivity, Vol. 29, Issue 5; ISSN 1051-8223

Publisher:: Institute of Electrical and Electronics Engineers (IEEE)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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Dipole Magnets Above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors Wang, Xiaorong; Gourlay, Stephen A.; Prestemon, Soren O. Instruments, Vol. 3, Issue 4 https://doi.org/10.3390/instruments3040062	journal	November 2019

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Title: Measurements of the Strain Dependence of Critical Current of Commercial REBCO Tapes at 15 T Between 4.2 and 40 K for High Field Magnets

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