Magnetic Characterization of MgB2 Bulk Superconductor for Magnetic Field Mitigation Solutions

Gozzelino, Laura; Minetti, B.; Gerbaldo, Roberto; Ghigo, Gianluca; Laviano, Francesco; Lopardo, G.; Plapcianu, C.; Agostino, Angelo; Cagliero, Stefano; Truccato, Marco; Zilberti, Luca; Mezzetti, Enrica

doi:10.1007/s10948-010-0993-4

Cited by 13 publications

(13 citation statements)

References 21 publications

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“…In the experiment we used disk-shaped MgB 2 samples placed on the axis of a solenoid producing a constant field B 0 as in [20]. Therefore, in order to reproduce the experimental results, in the model we can assume a cylindrical symmetry for the magnetic field B.…”

Section: The Modelmentioning

confidence: 99%

Screening magnetic fields by superconductors: A simple model

Caputo

Gozzelino

Laviano

et al. 2013

Journal of Applied Physics

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We introduce a simple approach to evaluate the magnetic field distribution around superconducting samples, based on the London equations; the elementary variable is the vector potential. This procedure has no adjustable parameters, only the sample geometry and the London length, λ, determine the solution. The calculated field reproduces quantitatively the measured induction field above MgB2 disks of different diameters, at 20K and for applied fields lower than 0.4T. The model can be applied if the flux line penetration inside the sample can be neglected when calculating the induction field distribution outside the superconductor. Finally we show on a cup-shape geometry how one can design a magnetic shield satisfying a specific constraint. arXiv:1308.2204v1 [cond-mat.supr-con]

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Section: The Modelmentioning

confidence: 99%

Screening magnetic fields by superconductors: A simple model

Caputo

Gozzelino

Laviano

et al. 2013

Journal of Applied Physics

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“…The equations have to be solved with the boundary (Dirichlet) conditions at infinity: 0, = A (9) and 0, = φ (10) that have been implemented by using a Jacobian transformation for sending the outer surface of a spherical shell to infinity [38]. The geometry studied in the present work is a hollow cylinder of finite height with two slits made in a vertical plane along a diameter.…”

Section: Modelmentioning

confidence: 99%

“…They can be used either at liquid nitrogen temperature (77 K) -at which magnetic shielding occurs up to a few tens of mT -or at low temperature (10 K and below) where shielding of magnetic fields in excess of 1 tesla was demonstrated recently [8,9]. Several materials are candidates for efficient magnetic screens, including MgB 2 [8,10], YBa 2 Cu 3 O 7 [3,11] or Bi-based compounds [12][13][14][15]. The basic shape for studying magnetic shielding is a hollow cylinder of typically of 2-5 cm diameter and 5-20 cm height.…”

Section: Introductionmentioning

confidence: 99%

Magnetic shielding properties of a superconducting hollow cylinder containing slits: modelling and experiment

Fagnard

Elschner

Hobl

et al. 2012

Supercond. Sci. Technol.

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This paper deals with the magnetic properties of bulk high temperature superconducting cylinders used as magnetic shields. We investigate, both numerically and experimentally, the magnetic properties of a hollow cylinder with two axial slits which cut the cylinder in equal halves. Finite Element Method (FEM) modelling has been used with a threedimensional geometry to help us in understanding how the superconducting currents flow in such a cut cylinder and therefore how the magnetic shielding properties are affected, depending on the magnetic field orientation. Modelling results show that the slits block the shielding currents flow and act as an "entrance channel" for the magnetic flux lines. The contribution of the slits to the total flux density that enters the cylinder is studied through the angle formed between the applied field and the internal field. The modelled data agree nicely with magnetic shielding properties measured on a bulk Bi-2212 hollow cylinder at 77 K. The results demonstrate that the magnetic flux penetration in such a geometry can be modelled successfully using only two parameters of the superconductor (constant J c and n value), which were determined from magnetic measurements on the plain cylinder.

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“…Since the discovery of its superconducting properties [ 1 ], MgB 2 has attracted a lot of interest both from the theoretical [ 2 , 3 , 4 ], and from the practical point of view, with many applications that have been explored and sometimes commercially developed and delivered to the market [ 5 , 6 , 7 , 8 , 9 , 10 ]. Preparation methods for this material span a large variety of different techniques [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ], and among them the Reactive Liquid Infiltration (RLI) method has proved to be suitable to produce objects with complex shapes, high density and good superconducting characteristics [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Activity of MgB2 Powders Produced via Reactive Liquid Infiltration Method

et al. 2021

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We report for the first time on the antimicrobial activity of MgB2 powders produced via the Reactive Liquid Infiltration (RLI) process. Samples with MgB2 wt.% ranging from 2% to 99% were obtained and characterized, observing different levels of grain aggregation and of impurity phases. Their antimicrobial activity was tested against Staphylococcus aureus ATCC BAA 1026, Enterococcus faecalis ATCC 29212, Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853, and Candida albicans ATCC 10231. A general correlation is observed between the antibacterial activity and the MgB2 wt.%, but the sample microstructure also appears to be very important. RLI-MgB2 powders show better performances compared to commercial powders against microbial strains in the planktonic form, and their activity against biofilms is also very similar.

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Magnetic Characterization of MgB2 Bulk Superconductor for Magnetic Field Mitigation Solutions

Cited by 13 publications

References 21 publications

Screening magnetic fields by superconductors: A simple model

Screening magnetic fields by superconductors: A simple model

Magnetic shielding properties of a superconducting hollow cylinder containing slits: modelling and experiment

Antimicrobial Activity of MgB2 Powders Produced via Reactive Liquid Infiltration Method

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