Self-Regulation Dynamics of Drift Wave-Zonal Flow Turbulence in a Linear Magnetized Plasma

The Low-Frequency Zonal Flow is studied experimentally with the Langmuir probe arrays in a linear magnetized plasma device. In a weakly developed drift turbulence, the 3D mode characteristics of $m\simeq{n}\simeq0, k_r\simeq0.16 cm^{-1}$ and a very near-zero mode frequency are obtained through spectrum analysis ,indicating the feature of zonal flow. The three-wave coupling between ZF and AT is shown through bispectrum analysis. Furthermore, the self-regulation dynamics are studied in such a drift wave-zonal flow (DW-ZF) turbulence through changing axial magnetic field, accompanying with the change of turbelence energy. Finally, the shearing effect of the DW by the ZF is also examined.