Observation of turbulence energy transfer in a cylindrical laboratory plasma device

Abstract

We report the experimental results on the turbulence energy transfer in a cylindrical laboratory plasma based on the data obtained by a set of quadruple Langmuir probe on Zheda plasma experiment device. The turbulence energy transfer is directly embodied in the alternating change in the fluctuation amplitudes between the low frequency turbulence at ∼0.1–0.2 kHz and the drift wave (DW) turbulence at ∼1–2 kHz. The estimation of the radial electric field and the bispectral analysis of the experiments suggest that the DW turbulence gains the energy from the low frequency turbulence with the magnetic field increase. The energy transport due to the interaction between the low frequency turbulence and the DW turbulence is a possible reason to drive the turbulence energy transfer associated with the magnetic field increase in the laboratory plasma.

Investigation of electromagnetic fluctuations in a magnetically screened high beta plasma

“…Within these devices, various phenomena such as observations of DW turbulence alongside shearing effects have been made, leading to investigations into the nonlinear energy transfer between E × B shear flow and DW turbulence. To effectively capture and simulate the dynamics of the DW-shear flow system, various plasma models have been used for CSDX and PANTA [6,12,13]. Employing numerical simulations using the BOUT code, nonlinear zonal flows have been generated in the presence of a finite density gradient, exhibiting a favorable qualitative and reasonably accurate agreement with LAPD plasma turbulence [14].…”

Identification of trapping finer-scale fluctuations in a solitary vortex in linear magnetized plasma

“…Consequently, research has been advanced in fundamental linear magnetized plasmas. For instance, investigations into the intrinsic nature of drift waves [7], transitions from drift wave to turbulence [8], direct observations of zonal flow generation [9], and interactions between drift wave and zonal flows [10][11][12][13] have been conducted.…”