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The demagnetization effect of a single-layered superconducting coil made of a cylindrical multifilamentary wire on its eddy-current loss is studied for the case of ac magnetic fields parallel to the coil axis. An expression for an effective demagnetization coefficient of the wire is obtained by taking account of the interaction among turns of the coil. It is shown from this expression that the magnitude of the eddy-current loss increases remarkably with the distance between neighboring turns of the coil. The experimental loss values of the wires wound into various kinds of coils are within 20% of the theoretical values.
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Sumiyoshi et al. (1980) studied this question.
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