Plasma Physics Seminar
Monday, February 11
1153 Mechanical Engineering Building
Speaker: Professor Paolo Ricci, Ecole Polytechnique Fédérale de Lausanne (EPFL)
"Progressive Steps Towards Global Validated Simulation of Edge Plasma Turbulence"
Abstract: The Global Braginskii Solver (GBS) code has been developed to simulate plasma turbulence in edge-relevant conditions. We have initially studied relatively simple configurations of increasing complexity, linear magnetic configurations and simple magnetized toroidal devices. GBS has now reached the capabilities of performing nonlinear self-consistent global three-dimensional simulations of the plasma dynamics in the Scrape-Off Layer (SOL). By solving the drift-reduced Braginskii equations, the code evolves self-consistently the plasma flux from the core, turbulent transport, and the plasma losses to the limiter plates. This gradual approach has allowed gaining a deep understanding of turbulence, from identifying the driving instabilities to estimating the turbulence saturation amplitude. A code validation development project has been conducted side by side with the GBS development and the methodology to carry out experiment-simulation comparison has been applied to quantify the level of agreement between the GBS results and the TORPEX experiment. This work is supported by the Swiss National Science Foundation.