Title :
Numerical simulation of contactless method for measuring critical current density-relation between flux flow in whole volume and onset of third harmonics
Author :
Kamitami, A. ; Saitoh, Ayumu ; Ikuno, Soichiro
Author_Institution :
Dept. of Informatics, Yamagata Univ., Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
A numerical code for analysing the time evolution of the shielding current density has been developed by using the element-free Galerkin method and the backward Euler method. The magnetic field generated by the shielding current density is calculated by use of the code and its time sequence data are analyzed by means of the discrete Fourier transform. The results of computations show that, if the frequency of the applied magnetic field exceeds a certain limit, the rapid onset of the third harmonics indicates the flux flow in the almost whole volume of the superconductor.
Keywords :
Galerkin method; Newton method; critical current density (superconductivity); discrete Fourier transforms; finite element analysis; flux flow; harmonic generation; superconducting magnets; Euler method; Galerkin method; contactless method; critical current density measurement; discrete Fourier transform; finite element method; flux flow; magnetic field; numerical code; numerical simulation; shielding current density; superconductor; third harmonics; time evolution; time sequence data; Critical current; Current density; Current measurement; Density measurement; Fluid flow measurement; Magnetic analysis; Magnetic field measurement; Magnetic shielding; Numerical simulation; Volume measurement; Finite element method; Galerkin method; Newton method; high-temperature superconductors; spectral analysis;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.831031
