Near mid-radius of a spherical tokamak the inverse aspect ratio is

PHYSICS · Subjective · Fermi University Physics · Plasma Physics · Kinetic theory, collisions and transport · Kinetic theory, collisions and transport

Plasma Physics, Ch Transport across and along the field: ambipolar, classical, neoclassical and anomalous

Problem

Near mid-radius of a spherical tokamak the inverse aspect ratio is ϵ=0.40\epsilon = 0.40, the safety factor is q=3.0q = 3.0, the local ion Larmor radius is rLi=2.0 mmr_{Li} = 2.0\,\mathrm{mm}, and the local ion collision time is τi=5.0×10−4 s\tau_i = 5.0\times10^{-4}\,\mathrm{s}. Estimate the neoclassical ion heat diffusivity in the banana regime, using χineo∼q2ϵ−3/2rLi2τi.\chi_i^{\rm neo} \sim q^2\epsilon^{-3/2}\frac{r_{Li}^2}{\tau_i}.

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