Estimations of Plasma Position and βp+li/2 from Magnetic Measurements under High-β Conditions in JET-2

Abstract

The MHD equilibria of a high-β plasma are studied by carring out magnetic measurements in JFT-2. Equilibrium configurations agreeing well with the experimental results are obtained by numerical calculations, and β_p, in the NB injection phase is estimated. Using these calculated equilibrium configurations, two methods of estimating R _p and β_p+l _i/2 from magnetic probe signals are also discussed, and the Fourier analysis method is shown to give a more accurate value of R _p and β_p+l _i/2 even under high-β conditions.