Magneto-Optical Investigation of the Critical State in Coated Conductors: Peculiarities of the Magnetic Field Distribution and the Determination of the Critical Current Density

2016 ◽  
Vol 26 (3) ◽  
pp. 1-5
Author(s):  
Maxim Osipov ◽  
Alexey Primenko ◽  
Igor Rudnev
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Field Distribution ◽  
Current Density ◽  
Critical State ◽  
Coated Conductors ◽  
Optical Investigation ◽  
The Magnetic Field

The Critical Current Density and the Curvature of the Magnetic Field in Epitaxial YBaCuO Films

1992 ◽  
Vol 170 (2) ◽  
pp. 549-562 ◽  
Author(s):  
D. Glatzer ◽  
A. Forkl ◽  
H. Theuss ◽  
H. U. Habermeier ◽  
H. Kronmüller
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
The Magnetic Field

Effect of microstructure on the magnetic-field dependence of the local critical current density inYBa2Cu3O7−δsuperconductors

1992 ◽  
Vol 46 (17) ◽  
pp. 10986-10996 ◽  
Author(s):  
L. M. Fisher ◽  
V. S. Gorbachev ◽  
N. V. Il’in ◽  
N. M. Makarov ◽  
I. F. Voloshin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Field Dependence ◽  
Current Density ◽  
Magnetic Field Dependence ◽  
The Magnetic Field ◽  
Effect Of Microstructure

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.

Intragrain Critical Current Density Estimated from the Magnetic Field in FieldOriented YBa2Cu3Ox Polycrystals

1994 ◽  
pp. 559-562
Author(s):  
Yuko Yokoyama ◽  
Tomoya Kubo ◽  
Yoshihiko Nakagawa ◽  
Masaithi Umeda ◽  
Yoshishige Suzuki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
The Magnetic Field
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