The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains
Bulk, single grain RE-Ba-Cu-O (where RE = rare earth or yttrium) [(RE)BCO] high temperature superconductors could potentially be used to generate stable magnetic fields for magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR). In these applications, however, the homogeneity of the m...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
IOP Publishing
2022
|
| _version_ | 1826308713563029504 |
|---|---|
| author | Shi, Y Mousavi, T Dennis, AR Ainslie, MD Speller, SC Grovenor, CRH Durrell, JH Cardwell, DA |
| author_facet | Shi, Y Mousavi, T Dennis, AR Ainslie, MD Speller, SC Grovenor, CRH Durrell, JH Cardwell, DA |
| author_sort | Shi, Y |
| collection | OXFORD |
| description | Bulk, single grain RE-Ba-Cu-O (where RE = rare earth or yttrium) [(RE)BCO] high temperature superconductors could potentially be used to generate stable magnetic fields for magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR). In these applications, however, the homogeneity of the magnetic field is of critical importance. As a result, the spatial distribution of critical current density, J c, within the bulk single grain and the effects of the magnetisation process, which are primary drivers of the uniformity of the achievable trapped magnetic field, are fundamental to assessing the performance of these technologically important materials. This paper reports the systematic measurement of the distribution of J c-B at 77 K over a vertical cross-section of a single grain along a facet line and through the seed crystal [(110)-F] at 20 positions within a 20 mm diameter Gd-Ba-Cu-O sample in an attempt to understand and assess the distribution of J c along this microstructural feature. A comparison of the data within the whole vertical plane across the seed measured along the a or b direction within the [(100)-a] plane shows that J c-B at 77 K at the facet line is more than 10% higher for applied fields between 0.2 T and 2.5 T. The effect of the J c-B relationship of the facet line on the overall trapped field measured in an individual bulk sample was investigated by measuring the magnitudes of trapped fields and their contour maps for sections cut from four single grain samples of GdBCO-Ag at different sizes and shapes parallel to the ab-plane from the top to the bottom of the bulk sample. Based on the results reported here, we demonstrate a method to achieve more uniform trapped fields through an optimal arrangement of an assembly of sections of individual GdBCO single grains. |
| first_indexed | 2024-03-07T07:23:26Z |
| format | Journal article |
| id | oxford-uuid:ce5e130c-3e62-42a6-bdbc-24fe010084e8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:23:26Z |
| publishDate | 2022 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:ce5e130c-3e62-42a6-bdbc-24fe010084e82022-11-02T07:50:18ZThe effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grainsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ce5e130c-3e62-42a6-bdbc-24fe010084e8EnglishSymplectic ElementsIOP Publishing2022Shi, YMousavi, TDennis, ARAinslie, MDSpeller, SCGrovenor, CRHDurrell, JHCardwell, DABulk, single grain RE-Ba-Cu-O (where RE = rare earth or yttrium) [(RE)BCO] high temperature superconductors could potentially be used to generate stable magnetic fields for magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR). In these applications, however, the homogeneity of the magnetic field is of critical importance. As a result, the spatial distribution of critical current density, J c, within the bulk single grain and the effects of the magnetisation process, which are primary drivers of the uniformity of the achievable trapped magnetic field, are fundamental to assessing the performance of these technologically important materials. This paper reports the systematic measurement of the distribution of J c-B at 77 K over a vertical cross-section of a single grain along a facet line and through the seed crystal [(110)-F] at 20 positions within a 20 mm diameter Gd-Ba-Cu-O sample in an attempt to understand and assess the distribution of J c along this microstructural feature. A comparison of the data within the whole vertical plane across the seed measured along the a or b direction within the [(100)-a] plane shows that J c-B at 77 K at the facet line is more than 10% higher for applied fields between 0.2 T and 2.5 T. The effect of the J c-B relationship of the facet line on the overall trapped field measured in an individual bulk sample was investigated by measuring the magnitudes of trapped fields and their contour maps for sections cut from four single grain samples of GdBCO-Ag at different sizes and shapes parallel to the ab-plane from the top to the bottom of the bulk sample. Based on the results reported here, we demonstrate a method to achieve more uniform trapped fields through an optimal arrangement of an assembly of sections of individual GdBCO single grains. |
| spellingShingle | Shi, Y Mousavi, T Dennis, AR Ainslie, MD Speller, SC Grovenor, CRH Durrell, JH Cardwell, DA The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains |
| title | The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains |
| title_full | The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains |
| title_fullStr | The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains |
| title_full_unstemmed | The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains |
| title_short | The effect of facet lines on critical current density and trapped field in bulk RE-Ba-Cu-O single grains |
| title_sort | effect of facet lines on critical current density and trapped field in bulk re ba cu o single grains |
| work_keys_str_mv | AT shiy theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT mousavit theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT dennisar theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT ainsliemd theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT spellersc theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT grovenorcrh theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT durrelljh theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT cardwellda theeffectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT shiy effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT mousavit effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT dennisar effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT ainsliemd effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT spellersc effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT grovenorcrh effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT durrelljh effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains AT cardwellda effectoffacetlinesoncriticalcurrentdensityandtrappedfieldinbulkrebacuosinglegrains |