scholarly journals Dependence of Critical Current on Voltage Probe Spacing in Superconducting Tape with Multiple Small Cracks and a Large Crack

2019 ◽  
Vol 60 (4) ◽  
pp. 574-582 ◽  
Author(s):  
Shojiro Ochiai ◽  
Hiroshi Okuda ◽  
Noriyuki Fujii
Keyword(s):  
Critical Current ◽  
Large Crack ◽  
Superconducting Tape ◽  
Small Cracks ◽  
Voltage Probe ◽  
Probe Spacing

scholarly journals CRITICAL CURRENT PROPERTIES OF Bi2Sr2Ca1Cu2Ox/Ag SUPERCONDUCTING TAPE

1992 ◽  
Vol 4 (1) ◽  
pp. 34-39,f3
Author(s):  
K. Togano ◽  
H. Kumakura ◽  
H. Kitaguchi ◽  
H. Maeda ◽  
J. Shimoyama ◽  
...  
Keyword(s):  
Critical Current ◽  
Superconducting Tape

Sausaging Mechanism and Effect on Critical Current Density in Bi2223/Ag Superconducting Tape

1997 ◽  
pp. 843-846
Author(s):  
Kazutaka Yamamoto ◽  
Hiroko Onoda ◽  
Yutaka Yamada ◽  
Tsutomu Koizumi ◽  
Takayo Hasegawa ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Tape

scholarly journals Stress/strain Dependence of Critical Current in Zr Reinforced Ag/Bi(2212) Superconducting Tape Externally Reinforced with CuAg.

1998 ◽  
Vol 33 (12) ◽  
pp. 760-765
Author(s):  
Kazumune KATAGIRI ◽  
Koichi KASABA ◽  
Yoshitaka SHOJI ◽  
Masaki ISHIZAKI ◽  
Kazuo WATANABE ◽  
...  
Keyword(s):  
Critical Current ◽  
Stress Strain ◽  
Strain Dependence ◽  
Superconducting Tape

scholarly journals How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2679 ◽  
Author(s):  
Bright Chimezie Robert ◽  
Muhammad Umar Fareed ◽  
Harold Steven Ruiz
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Critical State ◽  
Homogeneous Distribution ◽  
Angular Anisotropy ◽  
Superconducting Tape ◽  
Superconducting Material ◽  
Superconducting Coil

In an attempt to unveil the impact of the material law selection on the numerical modelling and analysis of the electromagnetic properties of superconducting coils, in this paper we compare the four most common approaches to the E-J power laws that serve as a modelling tool for the conductivity properties of the second generation of high-temperature superconducting (2G-HTS) tapes. The material laws considered are: (i) the celebrated E-J critical-state like-model, with constant critical current density and no dependence with the magnetic field; (ii) the classical Kim’s model which introduces an isotropic dependence with the environment magnetic field; (iii) a semi-empirical Kim-like model with an orthonormal field dependence, J c ( B ) , widely used for the modelling of HTS thin films; and (iv) the experimentally measured E–J material law for SuperPower Inc. 2G-HTS tapes, which account for the magneto-angular anisotropy of the in-field critical current density J c ( B ; θ ) , with a derived function similar to Kim’s model but taking into account some microstructural parameters, such as the electron mass anisotropy ratio ( γ ) of the superconducting layer. Particular attention has been given to those physical quantities which within a macroscopic approach can be measured by well-established experimental setups, such as the measurement of the critical current density for each of the turns of the superconducting coil, the resulting distribution of magnetic field, and the curve of hysteretic losses for different amplitudes of an applied alternating transport current at self-field conditions. We demonstrate that although all these superconducting material laws are equally valid from a purely qualitative perspective, the critical state-like model is incapable of predicting the local variation of the critical current density across each of the turns of the superconducting coil, or its non-homogeneous distribution along the width of the superconducting tape. However, depending on the physical quantity of interest and the error tolerance allowed between the numerical predictions and the experimental measurements, in this paper decision criteria are established for different regimes of the applied current, where the suitability of one or another model could be ensured, regardless of whether the actual magneto angular anisotropy properties of the superconducting tape are known.

Sign in / Sign up

Export Citation Format

Share Document