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N. Kasuya, S. Nishimura, M. Yagi, K. Itoh, S.-I. Itoh and N. Ohyabu
Development of Turbulence Diagnostics on Three-Dimensional Fields Obtained by Numerical Simulations in Magnetically Confined Plasmas
Date of publication:
22 IAEA Fusion Energy Conference, THC/P4-15
It is important to clarify the role of turbulent structures on anomalous transport in fusion plasmas. We have been developing a turbulence diagnostic simulator to promote collaboration between numerical simulations and experiments by progressing the e-science. For the study of structural formation in helical plasmas, the spatio-temporal data of turbulent fields are generated by global simulation using a reduced MHD model describing drift-interchange instability. Numerical diagnostics simulating turbulence diagnostics in experiments, such as a heavy ion beam probe and phase contrast imaging, are carried out on the time series data for quantitative comparison. Next, elemental processes of mode couplings are studied in detail in the simple cylindrical configuration. Three kinds of turbulent structures, i.e., zonal flow, streamer, solitary vortex, have been obtained in the nonlinear simulation of the resistive drift wave turbulence, and spectral analyses show the characteristic feature of each structure. The analyses provide a test to verify the appropriateness of spatial resolution, and give quantitative interpretation of observed signals, which deepen our physical understanding of self-sustained structural formation mechanism.
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