Passive Magnetic Shielding of Stacked Joint-free Superconducting Annular Disks Made of REBCO Tapes

Peng, Yongqiang; Zeng, Zhigang; Zhou, Difan; Zhao, Wenwen; Jia, Zhuoyue; Guo, Yanqun; Bai, Chuanyi; Feng, Feng; Chen, Yangyang; Cai, Chuanbing

doi:10.1007/s10948-021-05894-y

Cited by 5 publications

(2 citation statements)

References 48 publications

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“…These tapes can be used to reduce the amplitude of an external field or to improve the homogeneity of the field component parallel to them [46,47]. Stacked tape annuli can also be created [48] and were recently shown to shield up to 0.67 T at 77 K [49]. The second method is to use coated conductors as naturally short-circuited 'eyeshaped' loops in which persistent currents are induced [50,51].…”

Section: Introductionmentioning

confidence: 99%

Improving the screening ability of high-temperature superconductors by combining disk-shaped bulks and closed-loop coated conductors

Rotheudt,

Brialmont,

Fagnard

et al. 2024

Supercond. Sci. Technol.

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In this work, we demonstrate experimentally the remarkable DC magnetic screening ability of hybrid superconducting screens. The configurations under investigation combine a 30 mm-diameter disk-shaped superconducting bulk, or another with a 10 mm-diameter hole, with different closed superconducting loops made from coated conductors. The loops are placed coaxially with the bulk. The bulk superconductors and the closed-loop coated conductors are made of GdBa2Cu3O7 and the experiments are performed in liquid nitrogen (77 K). The DC and inhomogeneous field to be screened is produced by a bespoke coil and reaches around 100 mT at the location of the superconducting bulk, which is much less than its full-penetration field. By mapping the magnitude of the flux density using a 3-axis cryogenic Hall probe, we show that such a hybrid superconducting screen allows the maximum shielding factor SF above the bulk to be almost doubled. For the best investigated hybrid configuration, the SF reaches ~45 at 2.7 mm above the bulk. In addition, the area of the spatial region for which less than half of the applied field remains (SF > 2) is roughly multiplied by 4 when compared to a situation involving only a disk-shaped bulk. In this work, this region corresponds to a 60 mm-diameter circle. The choice of the loop diameter is found to result from a trade-off between maximum SF and extension of the screened region. Finally, we detail why these hybrid configurations bring such improvements: the key point is that the flux lines generated by the source coil are diverted by the bulk towards a region where the closed-loop coated conductors can oppose the best to them.

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Section: Introductionmentioning

confidence: 99%

Improving the screening ability of high-temperature superconductors by combining disk-shaped bulks and closed-loop coated conductors

Rotheudt,

Brialmont,

Fagnard

et al. 2024

Supercond. Sci. Technol.

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“…Our group showed experimentally [57] that a stack of coated conductor annuli can also act as an efficient magnetic shield. Peng et al [58] reported the 2D-axisymmetric modelling of the magnetic shielding behaviour of stacked coated conductors designed with various diameters, showing the significant potential of such stacks for shielding magnetic fields applied along the axis of the stack. The investigation of the magnetic shielding properties of such shields is now possible thanks to the development of 3D modelling techniques [59][60][61].…”

Section: Introductionmentioning

confidence: 99%

Magnetic shielding up to 0.67 T at 77 K using a stack of high temperature superconducting tape annuli of 26 mm bore

Brialmont

Dular

Wera

et al. 2023

Supercond. Sci. Technol.

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In this work we demonstrate the magnetic shielding ability of a stack of YBa2Cu3O7 (YBCO) tape annuli. The annuli are cut from a 46 mm wide second generation coated conductor deposited on a Ni-5at.%W alloy ferromagnetic substrate. The inner bore of the stacked tapes is 26 mm and the outer diameter is 45 mm. Three samples with different height (24 mm, 14.9 mm, 9.9 mm) are studied. All the experiments are carried out at both room temperature and liquid nitrogen temperature (77 K). The shielding efficiency is investigated when the magnetic field is applied either parallel to the axis of the stack (axial shielding) or perpendicular to it (transverse shielding). Under an axial field, magnetic shielding is found to be effective (SF > 3) up to magnetic flux densities of 0.67 T. The presence of the ferromagnetic substrates is found to have two important consequences. First, the stack of annuli is able to shield transverse flux densities in spite of its layered structure. Second, a finite magnetic shielding effectiveness is demonstrated at room temperature. In order to understand the contribution of the ferromagnetic substrates to the shielding mechanism, we use the experimental field dependence of the magnetic permeability as determined independently from hysteresis loop measurements on the same substrates. A finite-element homogenized model solved with an H-Φ formulation is shown to successfully reproduce the shielding factor of the stack at room temperature and 77 K, both under axial and transverse applied fields. These models are also used to assess the influence of the critical current density and the magnetic permeability on the shielding efficiency. Finally, the results are used to predict the magnetic shielding properties of higher stacks, demonstrating their significant potential to shield axial fields of ∼ 0.93 T (with SF > 10) at 77 K.

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Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli

Dular,

Brialmont,

Vanderbemden

et al. 2024

IEEE Trans. Appl. Supercond.

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Passive Magnetic Shielding of Stacked Joint-free Superconducting Annular Disks Made of REBCO Tapes

Cited by 5 publications

References 48 publications

Improving the screening ability of high-temperature superconductors by combining disk-shaped bulks and closed-loop coated conductors

Improving the screening ability of high-temperature superconductors by combining disk-shaped bulks and closed-loop coated conductors

Magnetic shielding up to 0.67 T at 77 K using a stack of high temperature superconducting tape annuli of 26 mm bore

Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli

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