Magnetic Fluctuations in Castor Tokamak

Measurements of the radial magnetic field fluctuations, B̅_r, have been performed with two sets of movable radial magnetic probes which are toroidally spaced in one set and poloidally spaced in the other set. The root mean square values (RMS) of the time derivative of the radial magnetic field fluctuations, dB̅_r/dt, have been obtained. Correlation coefficients are computed. Wavenumber-frequency spectra are also computed for different radial positions.