Most Electron Heat Transport Is Not Anomalous; It Is a Paleoclassical Process in Toroidal Plasmas

It is hypothesized that radial electron heat transport in magnetically confined toroidal plasmas results from paleoclassical Coulomb collision processes (parallel electron heat conduction and magnetic field diffusion). In such plasmas the electron temperature is equilibrated along magnetic field lines a long length L ( poloidal periodicity length πR₀q), which is the minimum of the electron collision length and an effective field line length. Thus, diffusing field lines induce a radial electron heat diffusivity M≡L/(πR₀q)~101 times the magnetic field diffusivity η/μ₀νₑ(c/ωₚ)².