Tokamak type thermonuclear device

Purpose: To facilitate the measurement for eddy current on a vacuum container by the measurement of the eddy current from plasma current and voltage and current for poroidal magnetic field coils. Constitution: In a tokamak device, current transformer coil voltage and vertical magnetic field coil voltage as control inputs are measured by a voltage detector. Plasma current, current transformer coil current and vertical magnetic field coil current as a part of the status amounts in the tokamak device are measured by a current detector. In an eddy current measuring device, a secondary observer is constituted to determine the uniform component and the double pole component of the eddy current. The eddy current measuring device comprises multipriers, an integrator and adders to output the measured values for the eddy current. (Yoshino, Y.)