Application of the continuous wavelet transform to the fluctuations and electric field analysis in the H-1 heliac

We apply the continuous wavelet transform (CWT) and a CWT spectral techniqu e to the analysis of the time-resolved fluctuation-driven particle flux in the H-1 heliac. The results confirm that in some cases the outward radial f lux reverses its direction. In addition, time-resolved frequency spectra of fluctuation signals obtained by CWT show that the dominant frequency compo nent as a function of time closely follows changes in the radial electric f ield. This suggests that the V-ExB drift velocity dominates the poloidal ph ase velocity of the fluctuations in the laboratory frame, in which case the time-resolved frequency can be used to characterize the radial electric fi eld. (C) 2001 American Institute of Physics.