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Influence of Ferromagnetic Layer on Critical Current of a Superconducting Wire

100%
Gömöry F., Vojenčiak M., Šouc J., Seiler E.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
605-608
EN
We investigated how a 10-50 μm layer from soft ferromagnetic material, incorporated in the architecture of a composite superconducting tape, could influence the capability of the tape to transport electrical current. Numerical procedure was developed to calculate the local distribution of magnetic field and current in the condition when all the superconductor is carrying its critical current density. It was found that the concentration of magnetic flux in ferromagnetic layers allows to reduce the local value of magnetic flux density felt by the superconductor. In this way, the critical current of the tape in low applied magnetic fields can be improved. This theoretical prediction is confirmed by experimental observation.
2
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Influence of DC Magnetic Field on AC Loss of YBCO Coated Conductor with Ferromagnetic Substrate

100%
Vojenčiak M., Šouc J., Gömöry F., Seiler E.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
359-362
EN
Most of YBCO tape conductors are prepared on a ferromagnetic substrate. The ferromagnetic material is then exposed to the self magnetic field of the superconductor and also to external magnetic field. In AC magnetic field hysteretic and eddy current losses are generated in the substrate. In this work the AC transport loss of an YBCO coated conductor on a ferromagnetic substrate was measured using electromagnetic method. There are two contributions to total loss - a loss in the superconductor and a loss in the substrate. To suppress the hysteretic loss in the substrate, it is possible to saturate it using DC magnetic field. In this regime significant decrease in total loss was observed.
3
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DC Characterization of the Coaxial Superconducting Cable

76%
Šouc J., Gömöry F., Vojenčiak M., Frolek L., Isfort D., Ehrenberg J., Bock J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
375-378
EN
Coaxial cable model with superconducting core and superconducting shield conductor was constructed and tested in DC regime. While the core was already examined in our previous works, in this contribution the detailed study of the superconducting shield conductor in DC conditions is presented. It consists of 16 ReBCO coated tapes with critical current 35 A each connected in parallel. Using shunts with known values placed in series the currents in individual tapes were possible to measure. Distribution of the total cable current into the individual tapes was monitored and its influence on critical current of the cable is discussed.
4
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Growth and Structure of Buffer Layers for High Temperature Superconducting Films

64%
Fröhlich K., Rosová A., Machajdík D., Šouc J., Figueras A., Weiss F., Chenevier B., Snauwaert J.
Acta Physica Polonica A
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1997
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vol. 92
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issue 1
255-258
EN
We have studied thin CeO_{2} buffer layers prepared by aerosol MOCVD on (11̅02) Al_{2}O_{3} substrate at high deposition temperature, T_{d}= 900°C. A texture analysis by X-ray diffraction showed a high degree of epitaxial character of CeO_{2} films. A study of the microstructure by transmission electron microscopy revealed that the CeO_{2} films are in a relaxed state being composed of slightly misoriented blocks surrounded by dislocations. The films are smooth, giving mean square root values of the surface roughness measured by atomic force microscopy up to 1 nm.
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