References of "Lousberg, Grégory"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailMagnetic properties of drilled bulk high-temperature superconductors filled with a ferromagnetic powder
Lousberg, Grégory; Fagnard, Jean-François ULg; Chaud, Xavier et al

in Superconductor Science and Technology (2011), 24

It is shown that filling the holes of a drilled bulk high-temperature superconductor (HTS) with a soft ferromagnetic powder enhances its trapping properties. The magnetic properties of the trapped field ... [more ▼]

It is shown that filling the holes of a drilled bulk high-temperature superconductor (HTS) with a soft ferromagnetic powder enhances its trapping properties. The magnetic properties of the trapped field magnet are characterized by Hall probe mapping and magnetization measurements. This analysis is completed by a numerical model based on a 3D finite-element method where the conductivity of the superconducting material is described by a power law while the permeability of the ferromagnetic material is fixed to a given value and is considered uniform. Numerical results support the experimental observations. In particular, they confirm the increase of trapped flux that is observed with Hall probe mapping after impregnation. [less ▲]

Detailed reference viewed: 114 (50 ULg)
See detailImproving the performance of trapped field magnets made of drilled bulk high-temperature superconductors by filling the holes with a soft ferromagnetic material.
Lousberg, Grégory; Fagnard, Jean-François ULg; Ausloos, Marcel ULg et al

Conference (2010, August)

The field trapped in a drilled bulk high-temperature superconductor (HTS) is shown to be enhanced when the holes are filled with a powder of a soft ferromagnetic material. Characterizations based on Hall ... [more ▼]

The field trapped in a drilled bulk high-temperature superconductor (HTS) is shown to be enhanced when the holes are filled with a powder of a soft ferromagnetic material. Characterizations based on Hall probe mapping and magnetization measurements are used and show an increase of the trapped magnetic field after impregnation. These results are examined with the help of a 3D finite element model, where the ferromagnet material has a simplified, linear, constitutive law in order to keep a manageable number of mesh nodes. Although such an approach is a first-order approximation, it already confirms the experimental observation and indicates a maximum increase of the magnetic flux of 40 %. [less ▲]

Detailed reference viewed: 10 (2 ULg)
See detailModeling high-temperature superconductors containing an array of holes
Vanderheyden, Benoît ULg; Lousberg, Grégory; Ausloos, Marcel ULg et al

Conference (2010, May 07)

We have recently implemented a finite-element model for the penetration of the magnetic flux inside a bulk superconductor containing an array of holes (thin-wall superconductor), with the help of the open ... [more ▼]

We have recently implemented a finite-element model for the penetration of the magnetic flux inside a bulk superconductor containing an array of holes (thin-wall superconductor), with the help of the open-source code GetDp. In this talk, I introduce the A-phi formulation used, with edge elements and spanning tree gauges. I explain how a time-iterative method allows one to make calculations with fewer time steps, and compare the obtained results with those derived by the Brandt method. [less ▲]

Detailed reference viewed: 11 (2 ULg)
See detailMeasurement and modeling of macroscopic ferromagnetic/high-Tc superconductor hybrid structures: applications to drilled bulk HTS with ferromagnetic materials inserted inside the holes.
Lousberg, Gregory; Regnier, J.-H.; Ausloos, M et al

Poster (2008, August)

Hybrid ferromagnetic/high-Tc superconductors (F/S) structures are realized by inserting iron cylinders inside the macroscopic columnar holes of drilled bulk high-Tc superconductors. The ferromagnetic ... [more ▼]

Hybrid ferromagnetic/high-Tc superconductors (F/S) structures are realized by inserting iron cylinders inside the macroscopic columnar holes of drilled bulk high-Tc superconductors. The ferromagnetic material, with its tendency to concentrate the magnetic flux lines, modifies the magnetic properties of HTS that are characterized by a repulsion of the flux lines. In particular, the trapped field distribution of hybrid F/S results from a trade-off between the opposite magnetic properties of both materials. With the help of a 3-axis Hall probe mapping experiment, we characterize both vertical and transverse components of the trapped magnetic field. The distribution of the magnetic field trapped in the neighborhood of a hole inside which a ferromagnetic material is inserted is further investigated by high-resolution magneto-optic images. Experimental results are discussed with the help of a 3D finite-element model of hybrid F/S structure. [less ▲]

Detailed reference viewed: 20 (6 ULg)