Adapting a commercial integrated circuit 3-axis Hall sensor for measurements at low temperatures: Mapping the three components of B in superconducting applications

Rotheudt, N.; Fagnard, J.-F.; Harmeling, P.; Vanderbemden, P.

doi:10.1016/j.cryogenics.2023.103693

Cited by 1 publication

(1 citation statement)

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“…The inhomogeneous flux density produced by the source coil in the absence of superconducting screen was measured to characterise its main features. For measuring simultaneously the distribution of the three components of ⃗ B, we use a bespoke 3-axis cryogenic Hall probe that we designed in a previous work [63] attached to a xyz micro-displacement system. The xyz displacement system consists of three independent motorised stages able to move the Hall probe in a volume of 300 mm × 300 mm × 200 mm (OSMS33-300(XY) and OSMS26-200(Z); Optosigma).…”

Section: Experimental Set-upmentioning

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: Experimental Set-upmentioning

confidence: 99%