Electron thermal diffusivity due to the electron temperature gradient mode.
Charge neutrality breaks down in the short wavelength toroidal electron temperature gradient mode. In contrast to the ion temperature gradient mode, the wave number normalized by the Debye wave number, k/k(De), appears as a natural scale parameter, rather than the finite Larmor radius parameter k( perpendicular )rho(e). The growth rate and consequent mixing length estimate yields an electron thermal diffusivity large enough to be relevant to tokamaks.
Hirose
A
A
Plasma Physics Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2.