Magnetic Shielding Above 1 T at 20 K With Bulk, Large Grain YBCO Tubes Made by Buffer-Aided Top Seeded Melt Growth

Wera, Laurent; Fagnard, Jean-François; Kumar, N. Devendra; Shi, Yunhua; Vanderheyden, Benoît; Vanderbemden, Philippe

doi:10.1109/tasc.2016.2633301

Cited by 24 publications

(31 citation statements)

References 36 publications

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“…These shields were obtained by carving fully machinable MgB 2 cylinders, fabricated by spark plasma sintering of BN-added MgB 2 powders [48,49]. We chose the working temperature of 30 K because it guarantees a negligible flux-jump occurrence, thus allowing the J c calculation [49], joined with still noteworthy shielding properties (by way of example, the cup shielding performances are still comparable with those found at 20 K on a YBa 2 Cu 3 O 7 cup with similar aspect ratio [8]).…”

Section: Materials Propertiesmentioning

confidence: 99%

“…This requirement is met with good results in a number of applications by superconducting (SC) devices. Recently, tested solutions have included both active (i.e., a set of coils fed with appropriate currents [6]) and passive layouts (i.e., a simple superconducting cavity [7][8][9]). The latter ones, which exploit the intrinsic property of the SC materials, can be assembled using SC bulks [10][11][12] and/or SC coated conductors/tapes [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Performance Analysis of MgB2 and Hybrid Magnetic Shields

et al. 2022

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Superconductors are strategic materials for the fabrication of magnetic shields, and within this class, MgB2 has been proven to be a very promising option. However, a successful approach to produce devices with high shielding ability also requires the availability of suitable simulation tools guiding the optimization process. In this paper, we report on a 3D numerical model based on a vector potential (A)-formulation, exploited to investigate the properties of superconducting (SC) shielding structures with cylindrical symmetry and an aspect ratio of height to diameter approaching one. To this aim, we first explored the viability of this model by solving a benchmark problem and comparing the computation outputs with those obtained with the most used approach based on the H-formulation. This comparison evidenced the full agreement of the computation outcomes as well as the much better performance of the model based on the A-formulation in terms of computation time. Relying on this result, the latter model was exploited to predict the shielding properties of open and single capped MgB2 tubes with and without the superimposition of a ferromagnetic (FM) shield. This investigation highlighted that the addition of the FM shell is very efficient in increasing the shielding factors of the SC screen when the applied magnetic field is tilted with respect to the shield axis. This effect is already significant at low tilt angles and allows compensating the strong decrease in the shielding ability that affects the short tubular SC screens when the external field is applied out of their axis.

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Section: Materials Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling and Performance Analysis of MgB2 and Hybrid Magnetic Shields

et al. 2022

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“…for mu-metal shields µ 0 M sat ∼ 0.7 T [6]). They can therefore operate at much higher flux densities [7][8][9][10][11][12]. This characteristic is a key element in the context of large scale superconducting devices generating flux densities of several teslas, e.g.…”

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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“…However, sometimes it is better to use single domain REBCO superconducting rings, because the superconducting rings can not only be used as REBCO bulks, but they also have another particular property, such as solenoid-coil-like permanent magnet with high magnetic flux density and magnetic shielding tubes [24][25][26][27][28][29][30][31][32], which can provide an ultralow or nearly zero magnetic field environment for special applications. So it is important to fabricate superconducting rings with good superconducting property.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and properties of single domain GdBCO superconducting rings by a buffer aided Gd+011 TSIG method

Yang¹,

Yang²,

Chen³

2017

Supercond. Sci. Technol.

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Single domain REBCO bulk superconductors can be fabricated by both the top-seeded melt texture growth process and the top-seeded infiltration and growth (TSIG) process. The buffer pellet technique used in these two methods has been demonstrated to act as an efficient seed and to aid the growth of the REBCO bulk superconductors. In this paper, we combined the Gd+011 TSIG method and buffer pellet technique together to fabricate single domain REBCO superconducting rings without any machining and obvious shrinkage of the final ring, which shows a satisfactory trapped field and very good magnetic shielding at the same time. It is found that (1) a single domain GdBCO ring, with inner diameter of 10 mm and outer diameter of 32 mm, has been fabricated by this method successfully. (2) The trapped field (0.32 T, 77 K) and maximum levitation force (80.1 N, 77 K) of the single domain GdBCO ring are nearly the same as the trapped field (0.33 T, 77 K) and maximum levitation force (80.2 N, 77 K) of the single domain GdBCO bulk with the same diameter and thickness, but the uniformity of trapped field is much better for the single domain GdBCO ring. (3) The single domain GdBCO ring shows very good magnetic shielding property, the magnetic flux density shielded by the superconducting ring is up to 0.40 T at 77 K, which is much higher than that of reported samples. The results indicate that the buffer aided Gd+011 TSIG method can provide an important way to fabricate high quality single domain REBCO superconducting rings directly.

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Magnetic Shielding Above 1 T at 20 K With Bulk, Large Grain YBCO Tubes Made by Buffer-Aided Top Seeded Melt Growth

Cited by 24 publications

References 36 publications

Modelling and Performance Analysis of MgB2 and Hybrid Magnetic Shields

Modelling and Performance Analysis of MgB2 and Hybrid Magnetic Shields

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

Fabrication and properties of single domain GdBCO superconducting rings by a buffer aided Gd+011 TSIG method

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