Round Conductor With Low AC Loss Made From High-Temperature Superconducting Tapes

Gömöry, Fedor; Šouc, J; Vojenčiak, M.; Solovyov, Mykola

doi:10.1109/tasc.2014.2376189

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…Meanwhile, this kind of composite conductors could enhance mechanical stability of a magnet system to some degree due to the use of high-strength metal. What is more, researches show that CORC-made coil produces lower losses at AC current amplitudes approaching the critical current [1].…”

Section: Seleted and Design Of Conductorsmentioning

confidence: 97%

Mechanical properties of HTS Magnet for a 5MJ SMES using coated conductor on round core

Guo

Wang

Zhu

et al. 2015

2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

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Conductor on round core (CORC) cable which was prepared by stacking in parallel High Temperature Superconductor (HTS) tapes with helical layout on a flexible round former. Based on configuration of CORC cable, this paper presents a HTS Magnet for a 5 MJ class Superconducting Magnetic Energy Storage (SMES) magnet. Mechanical properties due to the stress by Lorentz force must be evaluated for the stable operation of the magnet in large magnets. This paper mainly analyses the hoop strain of the magnet caused by Lorentz force. According to the analysis results, a method to strengthen structures of CORC cable was put forward after it was simulated by finite element method (FEM).

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Section: Seleted and Design Of Conductorsmentioning

confidence: 97%

Mechanical properties of HTS Magnet for a 5MJ SMES using coated conductor on round core

Guo

Wang

Zhu

et al. 2015

2015 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)

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“…Figure 6 shows SEM micrographs of the REBCO surfaces after tape bending with lay angles of α = 25 • , 30 , 52 • and 60 • with the former diameters d = 2, 3 and 4 mm used for each lay angle. The lay angles were chosen according to parameters that make sense for the CORC/CORT cable design [3,7,14]. The image captions in figure 6 also include percentage information about the critical current degradation.…”

Section: Microstructural Characterisation Of Rebco Surface After Tape...mentioning

confidence: 99%

“…high-field magnets [3][4][5] and power systems [6,7], that require assembling the tapes into a cable able to carry the required currents. The three most used cable configurations are: (a) twisted-stacked tape cable [8,9], (b) Roebel assembled coated conductor cable [10,11] and (c) conductor wound on round core (CORC) or tube (CORT) [6,[12][13][14]. The design of the CORC/CORT cable consists of helically wound CC tapes on a cylindrical former, providing the technological advantage of cable flexibility and sufficient tape transposition.…”

Section: Introductionmentioning

confidence: 99%

Effect of off-axis bending on microstructural and transport properties of coated conductor tape

Ries¹,

Gömöry²,

Mosat³

et al. 2022

Supercond. Sci. Technol.

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In this work, the changes of microstructural and DC transport properties of coated conductor tape, deformed in helical form during manufacturing of a round cable, were studied. Superconducting layer experienced both outward (“OUT”) and inward (“IN”) bending with respect to the round core (rod) at various lay angles and former diameters. The microstructure of the REBCO surface was observed by using SEM. Direct transport measurements in liquid nitrogen were used to investigate the influence of bending parameters on DC transport properties. In “OUT” configuration, the cracks on the REBCO surface were formed at diameter of 9 mm and less at lay angle of 45°. The critical current of the tape started to degrade at diameter of 10 mm and less. The investigation showed that the cracks are formed in direction following the rod axis. In “IN” configuration, the measurements were performed at lay angles: 25°, 30°, 38°, 45°, 52° and 60°. The highest critical current retention and the lowest damage on the REBCO layer were observed at a lay angle of 30°, in particular: the critical current visibly degraded at diameter as small as 3 mm, and defects were visibly observed at diameter of 2 mm. At higher lay angles than 30°, the critical current degraded sooner (at higher diameters) and increased density of defects in the form of “protrusion lines” was observed. We found that protrusion lines followed preferential cleavage direction in approx. 80° to the tape length, independently on the lay angle used. By using a lower lay angle than 30°, the critical current degraded sooner, although no protrusion lines were observed, but the cracks were formed at the tape edges. For both bending configurations, the lower former diameters led to higher density of defects on the REBCO surfaces accompanied by degradation of superconducting properties.

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“…At present, there are various forms of HTS conductors, such as twisted stacked-tape cable [3,4], quasi-isotropic strand [5][6][7], ROEBEL Assembled Coated Conductors [8,9], conductors in tube [1], Cross Conductor [10], soldered stacked-square [11][12][13] and conductor on round core (CORC) [14]. The CORC has some advantages in higher current carrying capability [15,16] and lower AC loss [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

HTS conductor coil by in-situ winding technology for large-scale high-field magnet

Gao,

Shi,

Yang

et al. 2023

Supercond. Sci. Technol.

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High temperature superconducting (HTS) conductors have become important candidates to be used in large-scale high-field magnets, owing to its high critical current density as well as good mechanical properties. At present, there are various forms of HTS conductors proposed. In this work, we reported the fabrication of the REBCO HTS coil using in-situ winding technology. The six-layer coil with a diameter of 410 mm achieved a total current of 2562 A, and generated a central magnetic field of 7.8 mT at 77 K. The stress, deformation, and defect caused during conventional winding procedure could be significantly decreased using in-situ winding technology, indicating it has great potential for the large-scale high-field magnets in next-generation fusion reactors.

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Round Conductor With Low AC Loss Made From High-Temperature Superconducting Tapes

Cited by 13 publications

References 14 publications

Mechanical properties of HTS Magnet for a 5MJ SMES using coated conductor on round core

Mechanical properties of HTS Magnet for a 5MJ SMES using coated conductor on round core

Effect of off-axis bending on microstructural and transport properties of coated conductor tape

HTS conductor coil by in-situ winding technology for large-scale high-field magnet

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