Collisional theory of electrical resistivity in trapped electron regimes

The distribution function is determined numerically for electrons subject to magnetic trapping, electron-electron, and electron-ion collisions, and an electric field large enough to invalidate the Spitzer–Härm (classical) approximation. The electrical resistivity is determined. It is compared with analytical theory for tokamaks, in the limit of large inverse aspect ratio ε, and small drift velocity Vd/Vth. The resistivity is plotted for values of ε and Vd/Vth for which no analytic theory is available.