[Phys-seminars] 2011-01-11 Condensed Matter Seminar

manassen at bgu.ac.il manassen at bgu.ac.il
Wed Jan 5 15:48:24 IST 2011


Condensed Matter Seminar

  DATE: 11-01-2011

  TIME: 11:30am (Mon)

  PLACE: Physics building (#54) room 207

TITLE: 
AC losses in superconductors

SPEAKER: 
Mr. Marat Spector, Dept. of Physics, BGU

ABSTRACT/COMMENTS:
Study of AC losses in superconducting wires and tapes is usually 
restricted by consideration of applied sinusoidal currents and/or 
magnetic fields. However, currents in electric power systems 
contain a wide variety of harmonics. The currents become strongly 
non-sinusoidal at the operation of converters, non-linear reactors, 
and during transient and overload conditions. We report the results 
of the analysis of the influence of higher harmonics of the current 
and magnetic field on AC losses in superconducting slabs, strips 
and coated conductors. Analytical expressions are obtained in the 
framework of Bean\'s critical state model; the power law 
voltage-current characteristics are treated numerically. It is 
shown that the contribution of higher harmonics to AC losses in 
superconducting elements can be tens times larger than in normal 
metals and the 5% harmonic can increases the losses by up to 20% 
in bulk materials and up to 110 % in normal metal parts of coated 
conductor and by 80% in superconducting layers of a coated conductor .



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