Angular dependence ofE–Jcharacteristics and dissipative properties in Bi-2223/Ag tape

Abstract

We study the angular dependence of E-J characteristics and dissipative properties due to thermal disturbance in the Bi-2223/Ag multifilamentary tape in the low-voltage region. In order to simulate the dissipative properties, we take into account the analytical expressions of the E-J characteristics as a function of temperature, external magnetic field and field direction, which agree well with the experimental data. It is shown that the simulation results of the dissipative properties agree with the experimental data semi-quantitatively. The relationship between the current sharing rate and its contribution to the temperature increase is also discussed, based on the simulation. These results are crucial for high-T c superconducting power application systems with a persistent current mode where even low-power dissipation is detrimental to the performance.

Analysis of Shielding Layers in HTS Cable Taking Account of Spiral Structure

“…Further, we have extended the expression in order to describe the magnetic anisotropy [9]. The detailed expressions are shown as follows:…”

Analysis of shielding property in Bi-2223/Ag multifilamentary tapes with multi-layer arrangement

“…The twisted structure of the tape is not considered in this study. Table 1 shows the specifications of the Bi-2223/Ag multifilamentary tape used for the analysis [4]. The multifilamentary structure of the Bi-2223/Ag tape is modeled as shown in Fig.…”

“…Kiss et al have proposed the percolation depinning model that expresses quantitatively the J-E curves as a function of temperature and magnetic field (we sometimes call the model as Kiss model) [5,6]. Then, we have extended this model for the expression of the magnetic anisotropy by considering the misorientation of the superconducting grains [4]. The J-E relations derived by the extended percolation depinning model are expressed as follows:…”

“…When B c−axis > B self , the curve is expressed by the extended percolation depinning model. dicular magnetic flux density, and defined as follows [4]:…”

“…That is, the extended percolation depinning model that expresses the J-E curves quantitatively for a wide range of the temperature, magnetic field and its direction [4] is introduced for the analysis. The practical structure of the Bi-2223 multifilamentary tape is also taken into account.…”