Abstract
The critical current densities of coated conductor samples are limited by the presence of low-angle grain boundaries. These boundaries provide an obstacle to current flow, which is determined by their misorientation angle. The superconducting layer of a coated conductor tape may be considered as a network of grains linked together by grain boundaries through which the supercurrent must pass. Such a network has been investigated using a two-dimensional grain model. The three-dimensional orientations of grains in the superconducting network can be assigned randomly based on information obtained from EBSD and x-ray texture measurements. By assigning critical current values to boundaries based on their calculated misorientation, the overall J{sub c} of macroscopic modelled samples can then be calculated. This paper demonstrates how such a technique is applied using a small-scale, idealized sample grain structure in an applied magnetic field. The onset of dissipation at the critical current may be viewed in terms of the flow of the magnetic flux across the sample along high-angle grain boundaries when the critical current is first exceeded. Through such a consideration, the model may be further used to predict the current-voltage characteristic of the coated conductor sample around the superconducting transition. (author)
Rutter, N A;
[1]
IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]. E-mail: ruttern@ornl.gov;
Glowacki, B A;
[1]
IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]
- Department of Materials Science, University of Cambridge, Cambridge (United Kingdom)
Citation Formats
Rutter, N A, IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]. E-mail: ruttern@ornl.gov, Glowacki, B A, and IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)].
Modelling the V-I characteristic of coated conductors.
United Kingdom: N. p.,
2001.
Web.
doi:10.1088/0953-2048/14/9/309.
Rutter, N A, IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]. E-mail: ruttern@ornl.gov, Glowacki, B A, & IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)].
Modelling the V-I characteristic of coated conductors.
United Kingdom.
https://doi.org/10.1088/0953-2048/14/9/309
Rutter, N A, IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]. E-mail: ruttern@ornl.gov, Glowacki, B A, and IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)].
2001.
"Modelling the V-I characteristic of coated conductors."
United Kingdom.
https://doi.org/10.1088/0953-2048/14/9/309.
@misc{etde_20189060,
title = {Modelling the V-I characteristic of coated conductors}
author = {Rutter, N A, IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]. E-mail: ruttern@ornl.gov, Glowacki, B A, and IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]}
abstractNote = {The critical current densities of coated conductor samples are limited by the presence of low-angle grain boundaries. These boundaries provide an obstacle to current flow, which is determined by their misorientation angle. The superconducting layer of a coated conductor tape may be considered as a network of grains linked together by grain boundaries through which the supercurrent must pass. Such a network has been investigated using a two-dimensional grain model. The three-dimensional orientations of grains in the superconducting network can be assigned randomly based on information obtained from EBSD and x-ray texture measurements. By assigning critical current values to boundaries based on their calculated misorientation, the overall J{sub c} of macroscopic modelled samples can then be calculated. This paper demonstrates how such a technique is applied using a small-scale, idealized sample grain structure in an applied magnetic field. The onset of dissipation at the critical current may be viewed in terms of the flow of the magnetic flux across the sample along high-angle grain boundaries when the critical current is first exceeded. Through such a consideration, the model may be further used to predict the current-voltage characteristic of the coated conductor sample around the superconducting transition. (author)}
doi = {10.1088/0953-2048/14/9/309}
journal = []
issue = {9}
volume = {14}
journal type = {AC}
place = {United Kingdom}
year = {2001}
month = {Sep}
}
title = {Modelling the V-I characteristic of coated conductors}
author = {Rutter, N A, IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]. E-mail: ruttern@ornl.gov, Glowacki, B A, and IRC in Superconductivity, Cavendish Laboratory, Cambridge (United Kingdom)]}
abstractNote = {The critical current densities of coated conductor samples are limited by the presence of low-angle grain boundaries. These boundaries provide an obstacle to current flow, which is determined by their misorientation angle. The superconducting layer of a coated conductor tape may be considered as a network of grains linked together by grain boundaries through which the supercurrent must pass. Such a network has been investigated using a two-dimensional grain model. The three-dimensional orientations of grains in the superconducting network can be assigned randomly based on information obtained from EBSD and x-ray texture measurements. By assigning critical current values to boundaries based on their calculated misorientation, the overall J{sub c} of macroscopic modelled samples can then be calculated. This paper demonstrates how such a technique is applied using a small-scale, idealized sample grain structure in an applied magnetic field. The onset of dissipation at the critical current may be viewed in terms of the flow of the magnetic flux across the sample along high-angle grain boundaries when the critical current is first exceeded. Through such a consideration, the model may be further used to predict the current-voltage characteristic of the coated conductor sample around the superconducting transition. (author)}
doi = {10.1088/0953-2048/14/9/309}
journal = []
issue = {9}
volume = {14}
journal type = {AC}
place = {United Kingdom}
year = {2001}
month = {Sep}
}