Victor Meerovich and Vladimir Sokolovsky

Victor Meerovich and Vladimir Sokolovsky
Experimental Study of Electromagnetic Properties of Superconductors
• Losses in time-varying magnetic fields
• Penetration of magnetic fields into superconductors
• Transition from superconducting to resistive state
• Stability of superconducting state
• Magnetic levitation based on superconductors
• Study of new superconducting materials
for technical application
DC Power supply
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Pulse
Generator
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Levitating chess fabricated by our group
for an international exhibition
Trigger
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Data
Acquisition
Card
Amplifier
SC sample
V
Liquid nitrogen
Experimental set-up for study of superconductor
response to short current pulses
Prospects for applied superconductivity
Losses in superconductors under time-varying magnetic
fields
Design of “coated” conductor
Two types of losses:
Hysteresis loss in the superconducting layer
Eddy current loss in the substrate and silver layers.
Origin of Losses in Superconductors
Magnetic field penetrates a superconductor in the form of vortices, each
vortex contains a quantum of magnetic flux:
f0 = h/2e = 2.07.10-15 Tm2
h is the Plank constant; e is the electron charge.
Interaction of a vortex with current I
Vortex structure:
Motion of a vortex in a superconductor