Measurements of plasma potential and electron temperature fluctuation in alow-temperature magnetized plasma

Measurements of fluctuations of plasma potential and electron temperature i n a toroidal magnetized plasma is carried out by applying a cylindrical pro be with insulating end plugs oriented parallel to the B-field in conjunctio n with another cylindrical probe oriented perpendicularly. Coherency and cr oss-phase between (V) over tilde (f) and (T) over tilde (e) are estimated, and typically have values close to 0.6 and pi respectively. Power-law spect ra are found for frequencies well above the poloidal rotation frequency wit h spectral index typically around 4.0 for (V) over tilde (f) and around 2.5 for (T) over tilde (e). The density gradient is above the threshold for fl ute interchange instability, and the results are consistent with theory and global numerical simulations of this plasma.