Numerical Analysis of REBCO High-Temperature Superconducting (HTS) Coils Based on Screening Effect

Shi, Shijie; Liang, R.

doi:10.1007/s10948-022-06392-5

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…In such high magnetic field applications there are high electromechanical forces and thus a concern for mechanical failure, particularly the degradation of REBCO coils. In addition, the screening current-induced field (SCIF) [24] as well as the anisotropic and inhomogeneous [25] nature of REBCO tape together connive to complicate the mechanics of deformation significantly. Therefore, it is important to develop a numerical tool to quickly and efficiently analyze the distribution of stress and strain in high-field REBCO coils.…”

Section: Introductionmentioning

confidence: 99%

Modelling the mechanics of 32 T REBCO superconductor magnet using numerical simulation

Srivastava,

Pardo

2024

Supercond. Sci. Technol.

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High temperature REBCO superconducting tapes are very promising for high-fieldmagnets. With high magnetic field application there are high electro-mechanical forces, and thusconcern for mechanical damage. Due to the presence of large screening currents and compositestructure of the tape, the mechanical design of these magnets are not straight forward. In addition,many contemporary designs use insulated winding. In this work we develop a novel two-dimensionalaxisymmetric finite element tool programmed in MATLAB that assumes the displacement field withinlinear elastic range. The stack of pancakes and a large number of REBCO tape turns are approximatedas an an-isotropic bulk hollow cylinder. Our results agree with uni-axial stress experiments inliterature, validating the bulk approximation. Here, we study the following configuration. Thecurrent is first ramp up to below the critical current and we calculate the screening currents and theforces that they cause using the MEMEP model. This electromagnetic model can now take insulatedmagnets into account. As a case study 32 T REBCO superconductor magnet is simulated numerically.We have done complete mechanical analysis of the magnet by including the axial and shear mechanicalquantities for each pancake unlike previous work where only radial and circumferential quantities arefocused. Effect on mechanical quantities without screening current is also calculated and compared.It is shown that including screening current induced field strongly affect the mechanical quantities,specially the shear stress. The latter might be the critical quantity for certain magnet configurations.Additionally, in order to overcome high stresses, a stiff over banding of different material is consideredand numerically modelled which significantly reduces the mechanical stresses. The FE based modeldeveloped is efficient to calculate the mechanical behaviour of any general superconductor magnetand its devices.

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Section: Introductionmentioning

confidence: 99%

Modelling the mechanics of 32 T REBCO superconductor magnet using numerical simulation

Srivastava,

Pardo

2024

Supercond. Sci. Technol.

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“…If one of these parameters exceeds critical values established by experimental measurements, the superconducting state disappears. Shi and Liang [11] present a comparative analysis of anisotropy both in its own field and in perpendicular and parallel magnetic fields. Therefore, in superconducting wires, the current densities are not uniformly distributed because of the screening currents that affect them.…”

Section: Introductionmentioning

confidence: 99%

Design and Numerical Study of Magnetic Energy Storage in Toroidal Superconducting Magnets Made of YBCO and BSCCO

Jubleanu,

Cazacu

2023

Magnetochemistry

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The superconducting magnet energy storage (SMES) has become an increasingly popular device with the development of renewable energy sources. The power fluctuations they produce in energy systems must be compensated with the help of storage devices. A toroidal SMES magnet with large capacity is a tendency for storage energy because it has great energy density and low stray field. A key component in the creation of these superconducting magnets is the material from which they are made. The present work describes a comparative numerical analysis with finite element method, of energy storage in a toroidal modular superconducting coil using two types of superconducting material with different properties bismuth strontium calcium copper oxide (BSCCO) and yttrium barium copper oxide (YBCO). Regarding the design of the modular torus, it was obtained that for a 1.25 times increase of the critical current for the BSCCO superconducting material compared with YBCO, the dimensions of the BSCCO torus were reduced by 7% considering the same stored energy. Also, following a numerical parametric analysis, it resulted that, in order to maximize the amount of energy stored, the thickness of the torus modules must be as small as possible, without exceeding the critical current. Another numerical analysis showed that the energy stored is maximum when the major radius of the torus is minimum, i.e., for a torus as compact as possible.

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Numerical Analysis of REBCO High-Temperature Superconducting (HTS) Coils Based on Screening Effect

Cited by 2 publications

References 29 publications

Modelling the mechanics of 32 T REBCO superconductor magnet using numerical simulation

Modelling the mechanics of 32 T REBCO superconductor magnet using numerical simulation

Design and Numerical Study of Magnetic Energy Storage in Toroidal Superconducting Magnets Made of YBCO and BSCCO

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