Bending Strain Sensitivity of Critical Current in REBCO Coated Conductor Winding for Coil Application at 77 K

Leon, Michael B. de; Nisay, Arman Ray; Diaz, Mark Angelo; Shin, Hyung-Seop

doi:10.1109/tasc.2022.3183954

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The REBCO tape is very vulnerable to bending in the edge direction. The edge-wise strain of REBCO tape is typically limited to less than approximately 0.5% [9,10]. In WISE-U conductors, the edge-wise strain of concern is expected to be concentrated in the current lead area, where the radius of curvature may be extremely small.…”

Section: Second Trial Of Energization Test By Improved Current Feeder...mentioning

confidence: 99%

Characteristics and causes of voltage observed at the current feeder of high-temperature superconducting WISE conductor

Narushima,

Garfias-Davalos,

Onodera

et al. 2023

J. Phys.: Conf. Ser.

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The HTS (high-temperature superconducting) conductor is a feasible candidate for constructing magnets for next-generation fusion devices because of its higher critical current in a high magnetic field. A new concept of the HTS-WISE (Wound and Impregnated Stacked Elastic tapes) conductor has been studied aiming to apply the fusion reactor magnet. Here, the WISE-U conductor is composed of stacked thirty REBCO tapes (10 mm width, 65 μm thickness, I c = 370 A @77 K, s.f.) wrapped by a stainless-steel coil tube which is inserted into the metal pipe. The 4 m-long REBCO tapes are folded with a radius of curvature of 35 mm in a hairpin-like structure. A low-melting-point metal U-Alloy 60 whose melting point is 60°C is poured into the pipe for impregnation to make the non-insulation conductor. The REBCO tapes and the current feeder made of oxygen-free copper were also impregnated with the U-Alloy 60 to connect. This fabrication method has the advantage of being easier to fabricate than the technique of connecting each tape using indium foil. The energization test results showed that a maximum current value of 16.9 kA was recorded at B = 5 T and T = 30 K, however, a burnout occurred in the current feeder before the critical current was determined. Then, the improved WISE conductor has been designed and tested which showed a maximum of 19kA was reached in the self-field and 20K. However, burnout still occurred in the current feeder section. In those experiments, the superconducting section has not been damaged at all. If this burnout had been avoided, a higher current-carrying capacity could have been obtained. Identifying the cause of burnout and improving the current feeder is required.

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Section: Second Trial Of Energization Test By Improved Current Feeder...mentioning

confidence: 99%

Characteristics and causes of voltage observed at the current feeder of high-temperature superconducting WISE conductor

Narushima,

Garfias-Davalos,

Onodera

et al. 2023

J. Phys.: Conf. Ser.

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“…For example, using COMSOL models and varying parameters such as the thickness of Hastelloy and copper layers, as well as the width of the tape, a study explored the combined effects of tension and torsion loads on inducing axial strain [8]. In recent studies, specific bending scenarios have been explored, such as the effect of width-wise bending on the permanent I c degradation of ReBCO tapes [9]. However, in coils, some other critical sections with combined bending can be found.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Strain in ReBCO Tapes Under Combined Helical-Hard-Way Bending and Critical Current Measurements

Milanchian,

Haajari,

Lyly

et al. 2024

IEEE Trans. Appl. Supercond.

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In this study, we investigate the mechanical behavior of high-temperature superconducting tapes under combined helical-hard-way bending load. The combined bending scenario is related to a helically wound solenoid where hard-way bending arises due to the connection of the tapes to the current terminals. Similar phenomena can also occur in double pancake coils due to the layer transitions. We have sought simulation methods to assess the associated mechanical strain that may lead to critical current degradation. Experimental measurements involve winding SuperOx 2G ReBCO tapes around formers with varying radii and lead angles to assess the critical current degradation resulting from combined helical-hard-way. The experimental procedure, results, and the utilized ANSYS finite element modeling approaches are presented. The strain distribution across different modeling assumptions is compared, including 2D and 3D tape models, homogenized tape material properties, and simulations accounting all tape layers individually. We evaluated the pros and cons of the presented approaches which are expected to be useful for future detailed analysis of such scenarios.

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Structural analysis of REBCO coated conductors and quasi-isotropic strands under bending using continuum shell element

Peng

Yong

2023

Cryogenics

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Bending Strain Sensitivity of Critical Current in REBCO Coated Conductor Winding for Coil Application at 77 K

Cited by 4 publications

References 19 publications

Characteristics and causes of voltage observed at the current feeder of high-temperature superconducting WISE conductor

Characteristics and causes of voltage observed at the current feeder of high-temperature superconducting WISE conductor

Simulation of Strain in ReBCO Tapes Under Combined Helical-Hard-Way Bending and Critical Current Measurements

Structural analysis of REBCO coated conductors and quasi-isotropic strands under bending using continuum shell element

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