TY - JOUR

T1 - Time dependent electric field and E-I curves in Bi-2223 tapes carrying DC currents and exposed to perpendicular AC magnetic fields

AU - Friedman, A.

AU - Lukovsky, G.

AU - Roitberg, V.

AU - Wolfus, Y.

AU - Kopansky, F.

AU - Kalisky, B.

AU - Yeshurun, Y.

PY - 2006/6/1

Y1 - 2006/6/1

N2 - A study of the time-dependent electric field, E(t), and E-I curves of BSCCO/Ag tapes at 77 K is presented. Measurements were performed on tapes carrying DC transport current and exposed to external AC (0-500 G, 4-400 Hz) magnetic fields perpendicular to the broad side of the tape. E-I curves measured at frequencies exceeding 50 Hz and at amplitudes of the AC field below 400 G are well described by power law in the range between 0.1 and 10 νV/cm of the electric field. The results within this domain of parameters are discussed, assuming a narrowing down of the DC current path under the application of a perpendicular AC field. Nearly linear dependency of electric field on transport current was observed at the frequency-amplitude domain below 10 Hz and above 500 G. Using magneto-optical techniques we are able to determine that in this domain the AC magnetic field fully penetrates the tape. Behaviour of E-I curves under these conditions can be elucidated using the dynamic resistance model in conjunction with the assumption that the magnetic field fully penetrates the superconductor.

AB - A study of the time-dependent electric field, E(t), and E-I curves of BSCCO/Ag tapes at 77 K is presented. Measurements were performed on tapes carrying DC transport current and exposed to external AC (0-500 G, 4-400 Hz) magnetic fields perpendicular to the broad side of the tape. E-I curves measured at frequencies exceeding 50 Hz and at amplitudes of the AC field below 400 G are well described by power law in the range between 0.1 and 10 νV/cm of the electric field. The results within this domain of parameters are discussed, assuming a narrowing down of the DC current path under the application of a perpendicular AC field. Nearly linear dependency of electric field on transport current was observed at the frequency-amplitude domain below 10 Hz and above 500 G. Using magneto-optical techniques we are able to determine that in this domain the AC magnetic field fully penetrates the tape. Behaviour of E-I curves under these conditions can be elucidated using the dynamic resistance model in conjunction with the assumption that the magnetic field fully penetrates the superconductor.

UR - http://www.scopus.com/inward/record.url?scp=33746318925&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/43/1/141

DO - 10.1088/1742-6596/43/1/141

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AN - SCOPUS:33746318925

SN - 1742-6588

VL - 43

SP - 572

EP - 575

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 141

ER -