Turbulence Diagnostic Simulator for Analyzing Structural Formation in Magnetically Confined Plasmas

Turbulent structures affect the level of anomalous transport, and their formation mechanism is one of the crucial issues in the fusion plasmas. The structural formation mechanism in cylindrical plasmas is discussed in detail to identify the bifurcation phenomena of the turbulent structure. A three-field reduced MHD model was extended to describe the resistive drift wave turbulence, and a zonal flow and a poloidally localized turbulent structure, which has the typical temporal scale of the streamer, are formed selectively by nonlinear couplings of unstable modes. We carried out analyses to simulate the measurement with electrostatic probes, and find out the characteristic features of the turbulent states. This is the first step for integrated comparison between experiments and numerical simulations by using a long series of three-dimensional turbulence data to understand the global transport phenomena.