Test of an 8.66-T REBCO Insert Coil With Overbanding Radial Build for a 1.3-GHz LTS/HTS NMR Magnet

Qu, Timing; Michael, Philip; Bascuñán, J.; Lécrevisse, Thibault; Guan, Mingzhi; Hahn, Seungyong; Iwasa, Y.

doi:10.1109/tasc.2016.2633626

Cited by 43 publications

(17 citation statements)

References 18 publications

(20 reference statements)

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“…Without reinforcement techniques such as overbanding [25] and co-winding [26], Lorentz force in radially outward direction could cause most threat to the outer turns in a solenoid coil winding. Based on previous models and analyses, we propose the following analytical expression to estimate this component of Lorentz force considering the screening current effect…”

Section: Maximum Radial Lorentz Forcementioning

confidence: 99%

Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis

Yan

Xin

Guan

et al. 2020

Supercond. Sci. Technol.

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Besides screening-current-induced magnetic fields (SCIF), the shielding effect in high-T c coated conductors also has an strong influence on its stress/strain distribution in a coil winding, especially during high-field operations. To demonstrate this phenomenon, a special experimental setup was designed. With an LTS background magnet and a small HTS insert coil, we were able to carry out direct observations on the hoop strains of a 10-mm wide REBCO sample. Measured data was compared against numerical solutions solved by electromagnetic models based on T -A formulation and homogeneous mechanical models, showing good agreements. An analytical expression was proposed to estimate the maximum radial Lorentz force considering the shielding effect. Using the developed numerical models, we further studied the potential effects of two of the mostly investigated methods, which were formerly introduced to reduce SCIF, including multi-filamentary conductors and current sweep reversal (CSR) approach. arXiv:1909.07553v2 [physics.app-ph]

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Section: Maximum Radial Lorentz Forcementioning

confidence: 99%

Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis

Yan

Xin

Guan

et al. 2020

Supercond. Sci. Technol.

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“…A similar phenomenon would happen in REBCO windings. Although several methods for the mechanical stability improvements were proposed [9], [10], it is necessary to clarify the mechanical phenomenon of both REBCO tapes and windings towards further developments of ultra-high magnetic field magnets.…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Simulation of REBCO Tapes Using Particle Methods

Mato

Noguchi

2022

IEEE Trans. Appl. Supercond.

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Ultra-high field superconducting magnets are facing a mechanical degradation problem. On 2017, a world-record high DC magnetic field of 45.5 T was generated by insert no-insulation (NI) Rare-Earth Barium Copper Oxide (REBCO) pancake coils (14.4 T), called "LBC3", and an outsert resistive magnet (31.1 T). Although the experiment showed a high potential of the NI REBCO magnets for ultra-high field generation, the insert NI REBCO pancake coils and the REBCO tapes were plastically deformed. The critical current properties of damaged REBCO tapes were degraded although the Hastelloy substrate of REBCO tapes is stiff and it has a high yield point of approximately 1 GPa. However, the mechanisms of the damaging REBCO tapes are not clarified. Therefore, it is necessary to clarify the mechanical phenomenon of REBCO tapes.In this paper, we model a REBCO tape with a smoothed particle hydrodynamics (SPH) method, which can represent plastic deformation. The SPH simulation is coupled with electromagnetic analysis with a partial element equivalent circuit (PEEC) model which we have previously developed. In the simulation, an external field, which linearly increases to 5 T and then decreases to 0 T, is applied to a short-length REBCO tape. The simulation results show that the REBCO tape largely deforms during the external field excitation and deexcitation.

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“…Superconducting high field magnet plays an important role in scientific instruments, accelerator magnets, nuclear magnetic resonances and energy storage, which always prefer higher magnetic fields [1][2][3][4]. Current superconducting magnets are based on low-temperature superconductors (LTS) like NbTi and Nb3Sn, and their fields are limited to 23.5 T, which is the critical fields of Nb3Sn.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic modelling using T‐A formulation for high‐temperature superconductor (RE)Ba ₂ Cu ₃ O _x high field magnets

Wang

Bai

et al. 2020

High Voltage

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Second generation (2G) high-temperature superconductor (HTS) (RE)Ba 2 Cu 3 O x (REBCO) shows a great potential in building high field magnets beyond 23.5 T. The electromagnetic modelling is vital for the design of HTS magnet, however, this always suffers the challenge of huge computation for high field magnets with large number of turns. This study presents a novel electromagnetic modelling based on T-A formulation for REBCO magnets with thousands of turns. An equivalent turn method is proposed to reduce the number of turns in calculation, so that the computation cost can be reduced significantly, and meanwhile the key electromagnetic behaviour of HTS magnet can be simulated with enough accuracy. The ramping operation of a fully HTS magnet with 12,000 turns are analysed using both the original T-A model with actual turns and improved T-A model with equivalent turns. The two models show a good agreement on the key electromagnetic behaviours of the magnet: distribution of current density, magnetic fields, screen current induced field and magnetisation loss, so that this improved T-A model using equivalent turns is validated. The T-A modelling of REBCO magnet is a powerful tool for the electromagnetic analysis of industry-scale high field magnets.

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Test of an 8.66-T REBCO Insert Coil With Overbanding Radial Build for a 1.3-GHz LTS/HTS NMR Magnet

Cited by 43 publications

References 18 publications

Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis

Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis

Plastic Deformation Simulation of REBCO Tapes Using Particle Methods

Electromagnetic modelling using T‐A formulation for high‐temperature superconductor (RE)Ba ₂ Cu ₃ O _x high field magnets

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Test of an 8.66-T REBCO Insert Coil With Overbanding Radial Build for a 1.3-GHz LTS/HTS NMR Magnet

Cited by 43 publications

References 18 publications

Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis

Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis

Plastic Deformation Simulation of REBCO Tapes Using Particle Methods

Electromagnetic modelling using T‐A formulation for high‐temperature superconductor (RE)Ba 2 Cu 3 O x high field magnets

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Electromagnetic modelling using T‐A formulation for high‐temperature superconductor (RE)Ba ₂ Cu ₃ O _x high field magnets