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AC Susceptibility of the YBa_2Cu_3O_7 Coated Conductor in High Magnetic Fields

100%
Seiler E., Frolek L.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
379-382
EN
The AC susceptibility of the YBa_2Cu_3O_7 coated conductor in the perpendicular applied AC magnetic field was investigated using an inductive experimental setup with a pair of coils connected in opposite. A harmonic homogeneous AC magnetic field was applied perpendicularly to the wide face of the YBa_2Cu_3O_7 coated tape. Together with this AC field, a parallel background DC magnetic field up to 14 T was applied perpendicularly to the tape. The measurements were performed at several constant temperatures in the range 3-50 K. In the region of high background DC fields (8-14 T) no influence of the tape's ferromagnetic substrate was detected, despite of the low measurement temperatures employed. The estimate of the critical current density (j_c) at 20 K and 14 T, based on the position of the imaginary AC susceptibility peak, gives the value j_c=0.53 MA/cm^2.
2
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DC Characterization of the Coaxial Superconducting Cable

61%
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.
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