Measurement of density turbulence and broadband magnetic fluctuations on ASDEX

Significant but distinct changes in the fluctuation spectra have been observed in the various operating regimes of ASDEX. When comparing the behaviour of the density and magnetic field fluctuations it should be kept in mind that the two diagnostics have different spatial weighting functions, defined by the scattering volume in the former case and by the distance from the probe and the mode number m in the latter case. Further experiments will be needed before a comparison with proposed theoretical models for the fluctuations and their propagation mechanism inside the plasma can be made. (orig.)