Eddy current measurement on a noncircular model shell

Toroidal eddy current density is measured on a 1/7 model of the aluminum shell (vacuum vessel) of the R-tokamak in order to confirm experimentally the computation done by eddy current analysis computer code EDDYTOR 6. Parallel and perpendicular components of magnetic induction measured with four sets of magnetic probes near the internal and external surfaces of the model shell are expanded in Fourier series of the poloidal angle of the shell. The eddy current density is determined from the measured components based on Ampère's law. Acceptable agreement is found between measurement and computation.