Abstract
Investigations of the losses in multifilamentary composite conductors which result from the simultaneous change of the external field B <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</inf> and transport current I are presented. The total loss is best characterized by a maximum normalized transport current i <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> = I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> /I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> (I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> = critical current) and a dimensionless field-change rate <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\beta = \tau\dot{B}_{e}/B_{p}</tex> , where τ is the relaxation time of the coupling current and B <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</inf> is the full-penetration field of a solid superconductor equivalent to the multifilamentary composite. For <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\beta \gsim 1</tex> , the composite conductor behaves like a solid and a saturation effect occurs in the loss. The characteristic feature of the composite appears only for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\beta \lsim 1</tex> . The increase in losses arising from the non-zero transport current theoretically, is not larger than about 30 percent. For practical calculations, the experimental results over a wide range of β and i <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> agree well with the theory.
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