| Popis: |
A self-consistent theory of finite-${\ensuremath{\beta}}_{e}$ universal-mode turbulence is developed. Saturation results from resonance broadening of the electron response due to magnetic shear. Electron diffusion, for ${\ensuremath{\beta}}_{e}g\frac{{m}_{e}}{{m}_{i}}$, is due to the magnetic part of the fluctuations. The diffusion coefficient, $D=0.1 {[\frac{{T}_{e}}{({T}_{i}+{T}_{e})}]}^{4}(\frac{{m}_{e}}{{m}_{i}{\ensuremath{\beta}}_{e}}){(\frac{{L}_{s}}{{L}_{n}})}^{2}\frac{{v}_{i}{{\ensuremath{\rho}}_{i}}^{2}}{{L}_{n}}$, scales inversely with density, is independent of magnetic field, and is in excellent quantitative agreement with observations on the Alcator tokamak. |
