Screening current rotation effects: SCIF and strain in REBCO magnets

Bond, D.K; Bird, M.D.; Dixon, I.R.; Painter, T.A.; Lü, Jun; Kim, K L; Walsh, R. P.; Grilli, Francesco

doi:10.1088/1361-6668/ac1525

Cited by 55 publications

(56 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was suggested in [23,29] that the deformation of a thin tape in a dry-wound coil could in turn change its angle with respect to the magnetic field. This should be more prominent where the radial field is much smaller than the axial field, which is the case in our study.…”

Section: Tilting Angle and Strain Dependent Jcmentioning

confidence: 99%

“…It was suggested by Li et al [20] that tilting of the superconducting tape could affect the magnetization process, particularly with a high axial-field to radial-field ratio. A report on the SCIF in the 32 T high-field magnet by NHMFL [29] suggests that the discrepancy between simulations and measurements could be reduced by incorporating the tilting angles in the electromagnetic model.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Screening-current-induced mechanical strains in REBCO insert coils

Yan

Song

Xin

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

In recent years, remarkable progresses have been made in the R&D efforts for high temperature superconducting (HTS) high-field magnets. The screening-current-induced magnetic field and mechanical stress/strain in rare-earth barium-copper-oxide (REBCO) coils are raising growing concerns. This paper presents experimental and theoretical analyses on the effects of screening-current-induced mechanical strains in a REBCO insert setup without transport currents. Strain measurements on two REBCO coils, with and without over-banding structures, were carried out in an low temperature superconducting (LTS) background field magnet. Electromagnetic-mechanical models were developed, coupling the tilting angles of the superconducting tapes and the strain dependency of the critical current. The discrete-coupled model with turn-to-turn contacts, the discrete-sequential model and the block model were implemented and compared against the measured hoop strains. Combining experimental data with simulation models, it is shown that moderate over-banding structures are effective in providing reinforcements for the superconductors. A new method of edge-bonding was proposed and tested, which could reduce hoop strains in low applied fields but failed in higher fields. This work could be useful for the design and analysis of future high-field REBCO magnets.

show abstract

Section: Tilting Angle and Strain Dependent Jcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Screening-current-induced mechanical strains in REBCO insert coils

Yan

Song

Xin

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Yan studies screening-current-induced mechanical strains in HTS insert coils [31,32]. The effect of the changing rotation angle of the conductor on the electromagnetic and stress state is investigated [33]. An elastoplastic mechanical model is used to study the corresponding mechanical responses during the quench propagation [34].…”

Section: Introductionmentioning

confidence: 99%

An electromagnetic-thermal-mechanical analysis model for high temperature superconducting magnets

Yang¹,

Ren²,

Xu³

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

High temperature superconducting magnet is the core component of superconducting power device, and its stability is the key factor that restricts the safe operation of superconducting power devices. In order to accurately and effectively evaluate the stability of superconducting magnets during operation, an electromagnetic-thermal-mechanical numerical simulation method for high temperature superconducting magnets is studied in this paper. Based on the model, the 150kJ SMES magnet as case is studied, the magnetic field and current density distribution are solved during the operation of the 150 kJ magnet, and its temperature rise, AC loss and stress analysis of the magnet are achieved. In addition, this work further analyses the critical current declination degree of superconducting tapes in the 150kJ HTS magnet under multi-field coupling, the dangerous region in operation is obtained and suggestions are put forward to avoid quench. The electromagnetic-thermal-mechanical model may provide an appropriate stability assessment with rapid and real-time calculations for HTS magnets.

show abstract

“…The influence of deformation of the HTS coil on the critical current density and electromagnetic field distribution is neglected in the uncoupled model. Kolb-Bond et al and Yan et al proposed the coupled electromagnetic-mechanical model, which takes into account the effect of mechanical strain [42,43]. In the coupled model, the electromagnetic field distribution and mechanical deformation of HTS coil can be calculated simultaneously, meaning the interaction of the electromagnetic and mechanical responses can be considered.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic-mechanical coupling analysis of high-temperature superconducting racetrack coil

Yu,

Niu,

Yong

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The second-generation high-temperature superconducting (HTS) coated conductor has been recognized as one of the most promising materialsfor high field magnets due to its superior electromagnetic and mechanical performances. HTS racetrack coils wound with the coated conductors are an extensively used configuration in engineering applications, such as HTS machines and high-speed maglevs. In this paper, in order to analyze the electromagnetic and mechanical behaviors of HTS racetrack coils, a 3D coupled electromagnetic-mechanical model is used to consider the effect of coil deformation and the strain dependence of critical current. The effectiveness of the coupled model is validated by comparing the numerical results with experimental data in the literature. A numerical simulation of a 3D HTS racetrack coil subjected to an external electromagnetic field is carried out using coupled and uncoupled models. The results indicate that the structure deformation can reduce the penetration depth of the screening current, and the hoop stress and strain are mainly concentrated on the circular part of the racetrack coil. Afterwards, the influences of various parameters on the electromagnetic and mechanical responses of the HTS racetrack coil are also investigated.

show abstract

Screening current rotation effects: SCIF and strain in REBCO magnets

Cited by 55 publications

References 26 publications

Screening-current-induced mechanical strains in REBCO insert coils

Screening-current-induced mechanical strains in REBCO insert coils

An electromagnetic-thermal-mechanical analysis model for high temperature superconducting magnets

Electromagnetic-mechanical coupling analysis of high-temperature superconducting racetrack coil

Contact Info

Product

Resources

About