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# Cross-field demagnetization of stacks of tapes: 3D modelling and measurements

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### Abstract

Stacks of superconducting tapes can trap much higher magnetic fields than conventional magnets. This makes them very promising for motors and generators. However, ripple magnetic fields in these machines present a cross-field component that demagnetizes the stacks. At present, there is no quantitative agreement between measurements and modeling, mainly due to the need of a 3D model that takes the real micron-thick superconducting layer into account. This article presents 3D modeling and measurements of cross-field demagnetization in stacks of up to 5 tapes and initial magnetization modeling of stacks of up to 15 tapes. 3D modeling of the cross-field demagnetization shows that the critical current density, $$J_c$$, in the $$c$$-axis does not play a role in cross-field demagnetization. When taking the measured anisotropic magnetic field dependence of $$J_c$$ into account, calculations agree with measurements with less than 4 \% deviation. Then, our 3D numerical methods can realistically predict cross-field demagnetization. Due to the force-free configuration of part of the current density, $$J$$, in the stack, better agreement with experiments will require measurement of the $$J_c$$ anisotropy for the whole solid angle range, including $$J$$ parallel to the magnetic field.

### Most cited references13

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### Dynamic testing and characterization of advanced materials in a new experiment at CERN HiRadMat facility

(2018)
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### High power density superconducting rotating machines—development status and technology roadmap

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### Author and article information

###### Journal
26 September 2019
###### Article
1909.12129