Diffusion and transport in tokamak plasmas

This lecture covers the principles of diffusive transport in tokamak plasmas, including classical and neo-classical diffusion, ambipolar diffusion, and turbulent transport leading to anomalous diffusion. It explains the random walk concept, charge-neutrality effects, and the impact of collisions on diffusive transport. The lecture also delves into the diffusion coefficients, mean squared displacement, and the role of collisions in weakly ionized plasmas. Furthermore, it discusses the fluid model for transport, heat conductivity, and heat exchange between ions and electrons. The presentation concludes with a comparison of classical and neo-classical diffusion, emphasizing the importance of understanding anomalous diffusion and internal transport barriers.