Turbulent transport regimes in the tokamak boundary and operational limits

What is it about?

Understanding turbulent transport in the tokamak plasma boundary is an essential step towards the design and the operation of future fusion power plants. Two-fluid, global, electromagnetic turbulence simulations are used here to identify the main parameters controlling turbulent transport in the tokamak boundary and to delineate an electromagnetic phase space of edge turbulence.

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Photo by DeepMind on Unsplash

Photo by DeepMind on Unsplash

Why is it important?

We identify four turbulent transport regimes as well as the main parameters controlling turbulence in these regimes. Analytical scaling laws describing the various regime transitions are derived and associated with the H-mode density limit, the L-mode density limit and the β-limit. Very good agreement is found between the analytical scaling laws and the results of turbulence simulations.