Evaluation of Critical Current for REBCO Coated Conductor Under Various Tensile Strains and Magnetic Field Angles

Ishizuka, Kouji; Oguro, Hidetoshi

doi:10.1109/tasc.2022.3176250

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…To fulfill the complex operating conditions of high-field magnets, researchers have proposed several kinds of cable and CICC design concepts [5][6][7][8] to maximize current carrying capacity, allow sufficient cooling, and provide enough mechanical support. HTS materials are brittle and stress/strain sensitive [9][10][11][12], which means that the cables, conductors and magnets need to be designed and constructed in such a way that the REBCO tapes are not subjected to excessive stress/strain conditions during manufacture, cool down and operation. To verify the availability of applying the proposed design concepts and developed manufacturing technologies, cables [13][14][15][16], insert coils [17][18][19] and CICC specimens [12][13][14][15][16][17][18][19][20][21][22] were manufactured and tested at low temperature and in different background magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Performance test of REBCO CICC sub-cables with 10 kA current under 20 T background field

Jin,

Zhou,

Fang

et al. 2023

Supercond. Sci. Technol.

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Although the commercially manufactured REBCO tapes exhibit a strong potential to enable future fusion magnets operation with a magnetic field above 15 T, design and development of highly stable cable in conduit conductor (CICC) technology is very important to achieve their practical application. To find a good solution for this demand, Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP) proposed two kinds of CICC design concepts, which are both manufactured from a sub-cable formed by winding the REBCO tapes spirally around a stainless steel spiral tube. As part of the on-going activities to develop REBCO CICC, two sections of sub-cable specimens were manufactured and bended to U-shape for testing under magnetic fields up to 20 T. The sub-cable specimens having 30 commercial 4 mm wide REBCO tapes features around 10 kA at 4.2 K and background magnetic field up to 20 T, which also shows a stable operation under electromagnetic (EM) load of around 200 kN/m, above 150 kN/m required by the designed CICC sub-cable. However, the calculated Ic of the other specimen degraded from 8.8 kA to 8.5 kA when cycling with an EM load of around 160 kN/m. The lower calculated n-value at 77 K and self-field as well as the observed imprints on the disassembled tape edges suggested that there should be some defects generated in the cable during cabling, bending to the sample holder or operation with high EM and thermal loads. These results exhibit the potential and feasibility of using the HFRC sub-cable for high field fusion magnet. But winding parameters need to be optimized to make sure safe operation in a more complex condition in Tokamak, especially if using tapes same as that used for the sample-B. Moreover, much more rigorous requirements should be listed for coil manufacturing processes without producing any defect in the tapes.

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Section: Introductionmentioning

confidence: 99%

Performance test of REBCO CICC sub-cables with 10 kA current under 20 T background field

Jin,

Zhou,

Fang

et al. 2023

Supercond. Sci. Technol.

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“…The layered structure and weak-link behaviour of REBCO [2] has driven the technological triumph of commercial tapes that include quasi-single crystals that are kilometres in length [3]. However, early experiments on REBCO [4], [5], as well as more recent measurements on detwinned tapes [6], have shown strongly anisotropic strain Manuscript receipt and acceptance dates will be inserted here. This work was supported by the Engineering and Physical Sciences Research Council grant number EP/L01663X/1.…”

Section: Introductionmentioning

confidence: 99%

Resistivity Measurements of the Strain, Temperature and Angular Dependence of the Upper Critical Field of REBCO Tapes up to 8 T

Gillard,

Raine,

Hampshire

2023

IEEE Trans. Appl. Supercond.

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The design and operation of a miniature strainboard for measuring the resistivity of high temperature superconducting tapes as a function of uniaxial strain (ϵ) are described. It was used inside a Physical Property Measurement System (PPMS) that provides access to high fields, variable temperature, and a rotator that can vary the angle of the sample with respect to the field. Resistivity measurements made using the strain-board over the strain range 0% to −1.1% in-field are presented for a REBCO (REBa2Cu3O7, RE: Rare-earth element) tape from SuperPower with artificial pinning centres (APC). Values of the upper critical field (Bc2) were extracted from the resistivity data. We found that although the temperature and angular dependence of Bc2 were similar to that found in previous studies using ac susceptibility measurements (i.e. the temperature index, n = 1.2 , the anisotropy constant, γ = 1.4 and the interlayer spacing s = 12 Å), the upper critical field we found was almost strain independent and therefore quite different. We explain these results by considering the bimodal behaviour of REBCO under strain that is found in single crystal data, and the large parallel shunt the strain-board provided in the measurements. In our resistivity measurements, Bc2 is determined by a small percolative supercurrent that preferentially flows through material with the highest critical parameters. Conversely, resistivity measurements at high currents, or ac susceptibility measurements, characterise the material with average or low critical parameters from the broad distribution of critical parameters produced in REBCO tapes under strain.

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Evaluation of Critical Current for REBCO Coated Conductor Under Various Tensile Strains and Magnetic Field Angles

Cited by 2 publications

References 8 publications

Performance test of REBCO CICC sub-cables with 10 kA current under 20 T background field

Performance test of REBCO CICC sub-cables with 10 kA current under 20 T background field

Resistivity Measurements of the Strain, Temperature and Angular Dependence of the Upper Critical Field of REBCO Tapes up to 8 T

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