Modelling Magnetic Fields and Shielding Efficiency in Superconductive Integrated Circuits

Bakolo, Rodwell S.; Staden, Ruben van; Febvre, Pascal; Fourie, Coenrad J.

doi:10.1007/s10948-016-3806-6

Cited by 4 publications

(1 citation statement)

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“…Kvitkovic et al also described the application of a planar magnetic shield to decrease the noise in the measurements of the magnetic eld 20 . Magnetic shields made of superconducting tapes were applied to increase the operating magnetic eld of superconductive integrated circuits 21 and the eciency of contactless power transfer 22 . Using the shielding eect of the superconductors it is possible to create a magnetic cloak 23 .…”

Section: Introductionmentioning

confidence: 99%

Improvement of the homogeneity of magnetic field by the attenuation of a selected component with an open superconducting shield made of commercial tapes

Kulikov

Kozlowski

Drobin

2019

Journal of Applied Physics

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Homogeneous magnetic fields are needed in many applications. The resolution of medical imaging techniques depends on the quality of the magnetic field, as does the efficiency of electron cooling systems used at particle accelerators. Current methods of improving homogeneity require complex arrangements of magnet windings. In this work, the application of commercial superconducting tapes for this purpose is analyzed experimentally and numerically. The shielding effect exhibited by the superconductors can be used to control the shape of the magnetic field. An open magnetic shield made of superconducting tapes is able to nullify the radial component of a solenoidal magnetic field, forming the long region of the homogeneous magnetic field. To form a shield, the superconducting tapes are wound on a former. Then, it is positioned coaxially inside an electromagnet. The measurements are performed in the DC magnetic field and at zero-field cooling conditions. A numerical model is developed to further analyze the magnetic field. New simplifications and proper constraints allow the use of an axial symmetry despite relatively complex geometry of the shields. Results from the simplified model and obtained experimentally are consistent. The decrease of radial component of the magnetic field and the significant improvement of its homogeneity are observed in a shielded region. The decrease of shielding quality with the increase of an applied magnetic field is observed. Empirical formulas describing the dependence of shielding quality on the geometry and the critical current of the shield are developed.

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Section: Introductionmentioning

confidence: 99%