Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We developed a method for the estimation of AC loss in superconducting tapes. First we measured the field profiles, <formula formulatype="inline"> <tex>$H(x,H_{a})$</tex></formula>, near the surface of a coated conductor (CC) using the scanning Hall probe method. Here, the x axis was parallel to the in-plane transverse direction of the CC tape and <formula formulatype="inline"> <tex>$H_{a}$</tex></formula> is the external field applied in normal direction with respect to the tape surface. Then from <formula formulatype="inline"> <tex>$H(x,H_{a})$</tex></formula>, we calculated the current profiles, <formula formulatype="inline"><tex>$J(x,H_{a})$</tex></formula>, by the inversion method. From <formula formulatype="inline"><tex>$J(x,H_{a})$</tex></formula> and the corresponding flux densities, we calculated the hysteretic energy losses per cycle, <formula formulatype="inline"><tex>$Q_{M}$</tex></formula>. <formula formulatype="inline"><tex>$H_{a}$</tex></formula> was decreased from <formula formulatype="inline"><tex>$H_{peak}$</tex></formula> to <formula formulatype="inline"> <tex>$-H_{peak}$</tex></formula> stepwise, and the temperatures were 77 K and 72 K. We estimated <formula formulatype="inline"><tex>$Q_{M}$</tex></formula> for various values of <formula formulatype="inline"><tex>$H_{peak}$</tex></formula>. We calculated the dimensionless characteristic function, <formula formulatype="inline"> <tex>$g$</tex></formula>, which are defined by <formula formulatype="inline"> <tex>$Q_{M}/(\mu_{0}I_{c}^{2})$</tex></formula>. Here <formula formulatype="inline"> <tex>$I_{c}$</tex></formula> is the critical current. Our g is similar to the Brandt's theoretical g although the current profile, <formula formulatype="inline"> <tex>$J(x,H_{a})$</tex></formula>, is somewhat different. </para>
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