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 -