TY - JOUR

T1 - A heuristic description of AC losses in superconducting slab with smooth voltage-current characteristics represented by power law

AU - Kajikawa, Kazuhiro

AU - Iwakuma, Masataka

AU - Funaki, K.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - This paper describes the theoretical evaluation of AC losses in the oxide superconductors with smooth transport properties. First, conventional expressions of AC losses are reviewed for the n-value model, in which the local electric field is proportional to the power of local current density. The superconductor under consideration is a slab with infinitely wide faces, to which an external AC magnetic field is applied along the surfaces. It is also assumed that the critical current density and n-value are independent of the magnitude of local magnetic field. As a result of theoretical consideration by combining Maxwell's equations and the n-value model for the voltage-current characteristics, it is pointed out that the loss factor can be determined by only two parameters. Next, a new type of expressions is proposed for the AC loss evaluation, and it is concluded that a discrepancy is less than 17% between analytical and numerical results.

AB - This paper describes the theoretical evaluation of AC losses in the oxide superconductors with smooth transport properties. First, conventional expressions of AC losses are reviewed for the n-value model, in which the local electric field is proportional to the power of local current density. The superconductor under consideration is a slab with infinitely wide faces, to which an external AC magnetic field is applied along the surfaces. It is also assumed that the critical current density and n-value are independent of the magnitude of local magnetic field. As a result of theoretical consideration by combining Maxwell's equations and the n-value model for the voltage-current characteristics, it is pointed out that the loss factor can be determined by only two parameters. Next, a new type of expressions is proposed for the AC loss evaluation, and it is concluded that a discrepancy is less than 17% between analytical and numerical results.

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U2 - 10.1016/S0921-4534(02)01593-9

DO - 10.1016/S0921-4534(02)01593-9

M3 - Article

AN - SCOPUS:17944395716

VL - 378-381

SP - 1097

EP - 1101

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - PART 2

ER -