Abstract
Results of micro-structural, phase and texture analysis of Nb-Ti tapes and results of magnetic flux dynamics fixed by Magneto-Optical Imaging (MOI) method are presented in order to investigate origin and consequences of the anisotropic pinning model proposed, and implemented earlier experimental results including Guided Vortex Motion (GVM) phenomenon.
Highlights
All practically used low-temperature superconducting materials including them with the cubic lattice structure (Nb-Ti alloy, Nb3Sn compound, etc.) demonstrate pronounced anisotropy of the electromagnetic superconducting properties, caused by the directional nature of manufacturing processes which lead to formation of the non-isotropic field of natural or artificial pinning centers and to anisotropic current-carrying capacity [1, 2].The macroscopic electrodynamics of such superconductors with anisotropic pinning was proposed phenomenologically, on the basis of empirical studying of critical Lorentz forces
For thin Nb-50%wt.Ti cold-rolled tapes this formalism allowed to calculate the value of critical Lorentz force for the arbitrary orientation of a magnetic field and transport current, measured by 2D Voltage Current Characteristic method [2], and to explain quantitatively the measured value of the angle between magnetic flux movement direction and the direction of the transport current [3]
In this paper we presented micro-structural, phase and texture analysis of Nb-Ti tapes and results of magnetic flux dynamics fixed by Magneto-Optical Imaging (MOI) method in order to investigate origin and interesting consequences of such a anisotropic pinning
Summary
All practically used low-temperature (conventional) superconducting materials including them with the cubic lattice structure (Nb-Ti alloy, Nb3Sn compound, etc.) demonstrate pronounced anisotropy of the electromagnetic superconducting properties, caused by the directional nature of manufacturing processes (rolling, drawing, etc.) which lead to formation of the non-isotropic field of natural or artificial pinning centers and to anisotropic current-carrying capacity [1, 2]. Force counteraction of system of the pinning centers to driving of a magnetic flux is described by a derivative of this tensor field on coordinates. For thin Nb-50%wt.Ti cold-rolled tapes this formalism allowed to calculate the value of critical Lorentz force for the arbitrary orientation of a magnetic field and transport current, measured by 2D Voltage Current Characteristic method [2], and to explain quantitatively the measured value of the angle between magnetic flux movement direction (and corresponding direction of the electric field induced by this movement) and the direction of the transport current (this is socalled “guided vortex motion” phenomenon - GVM) [3]. In this paper we presented micro-structural, phase and texture analysis of Nb-Ti tapes (both cold-rolled and heat-treated) and results of magnetic flux dynamics fixed by Magneto-Optical Imaging (MOI) method in order to investigate origin and interesting consequences of such a anisotropic pinning
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