A Method to Estimate the Necessary Twist Pitch in Multi-filamentary Superconductors

Lindau, Sandra Madeleine; Magnusson, Niklas; Taxt, Henning

doi:10.1088/1742-6596/507/2/022016

Cited by 1 publication

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“…These sample lengths can be converted to equivalent twist pitches. Consider figure 1, the area enclosed by the current loop in the twisted conductor is about one third (or more precisely one over π) of the loop of a corresponding non-twisted conductor with sample length equal to L of the twisted conductor [22]. Hence, an equivalent twist pitch becomes three times the sample length, and consequently the equivalent twist pitches in this study become 9, 12, 21, 36, 87 and 150 mm.…”

Section: Mgb 2 Samplesmentioning

confidence: 82%

Coupling currents and hysteresis losses in MgB₂superconductors

Magnusson¹,

Lindau²,

Taxt³

et al. 2014

Supercond. Sci. Technol.

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MgB 2 multi-filamentary superconductors are widely considered for use in dc applications. To expand the possible application range to ac apparatuses, the development of a low ac loss wire is needed. This development involves several steps, and a solid understanding of the loss mechanisms is important to optimize that process as well as for evaluating dc wires exposed to current or magnetic field ripple. In this study we discuss the coupling currents and their influence on hysteresis loss as well as on coupling current loss. We give a phenomenological explanation of the origin and behaviour of the coupling currents and describe the loss patterns for hysteresis loss and coupling current loss separately. Finally, we interpret measured AC losses in an MgB 2 wire cut into different lengths representing different twist pitches. Under certain circumstances short sample lengths are shown to give inaccurate measurement results. On the other hand, short sample lengths of non-twisted wires can be used to estimate the twist pitch necessary to electromagnetically decouple the superconducting filaments.

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Section: Mgb 2 Samplesmentioning

confidence: 82%