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ST166 - A New Numerical Approach to Fnd Current Distribution and AC Losses in Coaxial Assembly of Twisted HTS Tapes in Single Layer Arrangement

A New Numerical Approach to Find Current Distribution and AC Losses
in Coaxial Assembly of Twisted HTS Tapes in Single Layer Arrangement

Majid Siahrang1, Frédéric Sirois1, Francesco Grilli2,
Slobodan Babic1 and Simon Brault1

1École Polytechnique de Montréal, Montréal, QC, H3C 3A7, Canada
2Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1,
D-76344 Eggenstein-Leopoldshafen, Germany

Email: [email protected]

ABSTRACT - This paper presents a novel technique for evaluating AC losses and current distribution in single layer assemblies of coaxially wound thin conductors, such as YBCO coated conductors. The proposed approach takes into account the twisted geometry of the individual superconducting tapes by considering the integral relation between the magnetic vector potential and the current density in the tapes (Biot- Savartformula). The integrals are solved numerically and semi-analytically, and the results are used to generate a discretized system of equations based on the magnetic flux diffusion equation (eddy current problem). The latter is solved using an effcient time transient solver (DASPK). It is assumed that, due to the helical symmetry of the problem, it is suffcient to solve for the current distribution in half of a single tapecross-section, even if many tapes are present, which allows a drastic reduction of the 3-D problem to asimple 1-D domain. The method was used to evaluate the AC losses of a HTS cable made of coated conductors, and it was observed that for a given radius of the former and number of tapes, twisted tapes with smaller pitch have lower AC losses.

IEEE/CSC & ESAS EUROPEAN SUPERCONDUCTIVITY NEWS FORUM (ESNF), No. 11, January 2010
Published in Journal of Physics Conf. Series (SuST234, 022034 (2010)