Frequency dependence of self-field AC losses in Bi-2223/Ag tapes

We have studied the frequency dependence of self-field ac losses in multifilamentary Bi-2223/Ag tapes at 77 K. The losses were measured at the frequencies of 1-400 Hz. The electromagnetic loss measurements were completed by the measurement of the magnetic flux distribution inside the tape due to the...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2000-03, Vol.10 (1), p.1212-1215
Main Authors: Paasi, J., Masti, M., Lehtonen, J., Kalliohaka, T.
Format: Article
Language:English
Subjects:
Applied sciences
Computation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductors
Creep
Creep (materials)
Cuprates superconductors (high tc and insulating parent compounds)
Current measurement
Electromagnetic measurements
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Finite element methods
Flux
FLUXES
FREQUENCY
Frequency dependence
Frequency measurement
High-Tc compounds
Loss measurement
Magnetic flux
Magnetic losses
MATHEMATICAL ANALYSIS
Physics
Silver
Superconducting device characterization, design, and modeling
Superconducting tapes
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TAPE
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have studied the frequency dependence of self-field ac losses in multifilamentary Bi-2223/Ag tapes at 77 K. The losses were measured at the frequencies of 1-400 Hz. The electromagnetic loss measurements were completed by the measurement of the magnetic flux distribution inside the tape due to the ac transport current at different stages of the ac cycle. According to the results the ac losses per cycle at fixed current amplitude are the higher the lower the frequency. The experimental results were compared to numerical ones computed using the finite-element method. The comparison between the experimental and computational results states that the frequency dependence of the losses per cycle is mainly caused by finite values of index n (of the E(J)-characteristics) due to thermally activated flux creep. As a result, the self-field penetrates the deeper into the conductor the lower the frequency, which means higher hysteresis losses per cycle.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.828452