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Coated conductor에서 magneto-optical image와 scanning hall probe를 이용한 flux profile의 측정 및 분석
이효연,곽기성,이준규,유재은,염도준,Lee, H.Y.,Kwak, K.S.,Rhyee, J.K.,Yoo, J.,Youm, D. 한국초전도학회 2010 Progress in superconductivity Vol.11 No.2
The magnetic flux profiles in SmBCO and YBCO coated conductors(CC) in the presence of the external field were comparatively investigated by magneto-optic image and scanning hall probe measurements. The current distributions calculated by using the inversion method from measured field profiles show that the decrease of current densities near the edges of SmBCO CC is more significant than those of YBCO CC. Through the comparison of the numerical analysis based on Kim's critical state model and the Brandt and Indenbom's solution, we found that this feature is related to their different field dependant properties of the critical current densities.
곽기성,이효연,이준규,염도준,유재은,한영희,박병준,Kwak, K.S.,Lee, H.Y.,Rhee, J.K.,Youm, D.,Yoo, J.,Han, Y.H.,Park, B.J. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.13 No.3
In this paper, we used E-J constitutive law and H-formulation to calculate magnetic field profile, current density, and magnetization of high temperature superconductor (HTS) placed in time varying applied magnetic field. Finite element method (FEM)-based software, Comsol Multiphysics 3.5a, was employed to simulate 2-dimensional model of a superconducting thin strip. The numerical results based on Kim's critical state model were compared with the case of strip in a perpendicular field in the Brandt's paper as well as experimental data observed by Scanning Hall Probe and SQUID.