A Simplified Model of the Field Dependence for HTS Conductor on Round Core (CORC) Cables

Shen, Boyang; Chen, Xiaoyuan; Fu, Lin; Zhang, Mingshun; Chen, Yu; Sheng, Jie; Huang, Zhen; Wang, Wei; Zhai, Yujia; Yuan, Yupeng; Soomro, Wafa Ali; Guo, Youguang; Bian, Xingming; Liu, Hongwei; Öztürk, Yavuz; Tian, Mengyuan; Hao, Luning; Hu, Jintao; Wei, Haigening; Shah, Adil; Patel, Ismail; Yang, Jiabin; Coombs, Tim

doi:10.1109/tasc.2021.3089117

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…The T-A formulation [37][38][39][40][41] assumes the superconducting layer as a thin thickness-free superconducting layer. The current and magnetic fields are calculated by coupling T and A.…”

Section: T-a Formulationmentioning

confidence: 99%

Effect of winding methods: transport AC losses in CORC coils

Zhao

Gao²,

Wu³

et al. 2022

Supercond. Sci. Technol.

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AC losses undoubtedly increase the burden on the cooling system and affect the overall performance of HTS cables. Therefore, AC losses in HTS cables are important design factors for large-scale HTS equipments. Extensive research has been conducted on straight, densely wound conductors. However, AC losses of bending/circular conductors have not been sufficiently studied. In this article, the transport AC losses in a circular HTS conductor coil bended by a conductor on round core (CORC) type cable were investigated using experiments and numerical simulations. The effect of different winding methods was also studied. First, the modeling method of the three-dimensional simulation and the experimental procedures were presented. The simulation results of the straight densely wound conductor (SDWC) and circular densely wound coil (CDWC) were compared with the corresponding experimental results. Finally, the winding method for the CDWC was optimized using both the simulation and experimental approaches. Both the experiments and simulations showed that reducing the tape-to-tape frontal area was able to decrease the transport AC loss, and the results show that the optimum winding angle of the HTS CORC coil was 24.15°. Overall, the modeling and experiments provide useful optimization strategies for designing winding structures of high-performance CORC coils/magnets.

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Section: T-a Formulationmentioning

confidence: 99%

Effect of winding methods: transport AC losses in CORC coils

Zhao

Gao²,

Wu³

et al. 2022

Supercond. Sci. Technol.

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“…The effects of the spiral angle of tapes on losses have been reported [39,40]. In order to enhance the reliability of the simulations, 3D numerical models [41][42][43][44][45][46][47] and multiscale approaches [48,49] were developed to solve the asymmetric and large-scale structures. The losses of the CORC cables given by 3D models [43,[50][51][52] have been verified by experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of electromagnetic behavior in CORC cable based on a modified H−ϕ formulation

Shan

Wang²,

Yong³

et al. 2023

Supercond. Sci. Technol.

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AC losses have an important effect on the stable operation of high temperature superconductors (HTSs). The researchers have proposed many formulations to estimate the AC losses based on finite element method (FEM), such as T-A formulation, H formulation and H-Φ formulation. In order to simulate the complicated multi-layer conductor on round core (CORC) cable with transport current, the modified H-Φ formulation is proposed to calculate AC losses in complicated HTS structures in this paper. The formulation is verified by comparing the calculation results with the existing formulations and experiments, which is easy to be implemented and has faster computation speed. The electromagnetic behaviors of CORC cables and the helical coil wounded by a 3-layer CORC cable are investigated with the modified H-Φ formulation. The numerical results show the non-uniformity of the losses and currents in the different layers of CORC cable. What’s more, the effects of the external magnetic field on the distribution of the transport current are also discussed.

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“…Another crucial aspects for the CORC ® is the proper computation of the current distribution among tapes and the possible re-distribution due to external disturbance. Some simplified approaches simulate the current distribution on CORC ® by an equivalent network model [23] or represent the 2D cross-section of cables where the helical structure is neglected [24]- [27]. However, due to the peculiar geometry, those simplifications do not allow to properly reproduce the actual cable behavior and the accurate evaluation of losses, which mostly occur on CORC ® edges [28], [29].…”

Section: Introductionmentioning

confidence: 99%

A New Coupled Electrodynamic T – A and Thermal Model for the Critical Current Characterization of High-Temperature Superconducting Tapes and Cables

Viarengo,

Brouwer,

Ferracin

et al. 2023

IEEE Access

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Future collider accelerators will rely on high-temperature superconductors reaching high field up to 20 T and above. Among the existing high-temperature superconducting materials, the Rare-earth Barium Copper Oxide (ReBCO ) tapes arranged according to the Conductor-on-Round-Core (CORC ® ) concept could be a viable solution to wound accelerator magnets such as Cosine Canted Theta (CCT) magnets. Dedicated experimental characterization of the critical current to quantify the degradation due to the winding process and operating conditions should proceed in parallel to the development of numerical models capable to reproduce and, in perspective, predict the cable performance. This paper presents the development of a new multi-physics model for a CORC ® wound with ReBCO tapes together with its validation. The T − A formulation has been used leveraging the high aspect ratio of tapes, suitably coupled with a conduction thermal model which for the first time properly accounts for the cable convective cooling. The model developed in this work can accurately simulate the thermal, electric and magnetic behaviors and the current sharing among tapes by using a set of self-consistent boundary conditions adopted for the first time in this kind of simulations. The model is verified and benchmarked against other well-established formulations on a set of test cases. The comparison of the computed V − I characteristic of the straight cable to available experimental data shows that the main physics features of the cable are well captured by the model, including performance degradation due to cable tapering at the terminations.INDEX TERMS Numerical models, CORC ® cables, critical current, multiphysics model, high-temperature superconductors,hybrid formulation.

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A Simplified Model of the Field Dependence for HTS Conductor on Round Core (CORC) Cables

Cited by 9 publications

References 14 publications

Effect of winding methods: transport AC losses in CORC coils

Effect of winding methods: transport AC losses in CORC coils

Numerical simulations of electromagnetic behavior in CORC cable based on a modified H−ϕ formulation

A New Coupled Electrodynamic T – A and Thermal Model for the Critical Current Characterization of High-Temperature Superconducting Tapes and Cables

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