Session 1P - Transport/Numerical Simulations.
POSTER session, Monday morning, November 11
Exhibit Hall - Concourse Level, Adam's Mark
We propose a practical and accurate way to model non-adiabatic effects for the fast passing electrons using a zero-electron-inertia fluid model derived from moments of the drift kinetic equation. (S.E. Parker, L. Chen and W.W. Lee, 3A8, 15th Int. Conf. on the Numerical Simulation of Plasmas, Valley Forge, PA, Sept. 1994.) This is a natural extension of the adiabatic electron model to include effects of electron ExB flow, electron pressure gradient effects (e.g. ømega_*e), and most importantly the electron parallel current, which in turn is used to include electromagnetic perturbations perpendicular to the equilibrium B-field (\delta B_\perp). This model circumvents numerical constraints on k_\parallel v \Delta t, as well as free streaming particle noise. As a first approximation, we will treat all electrons this way, but keep in mind the options of eventually having: 1) a fast passing fluid component and a slow and trapped full dynamics component; or 2) a fast passing fluid component, a slow full dynamics component, and a trapped bounced averaged component. This hybrid model will first be used to study the \beta dependence of heat transport from ITG driven microturbulence modified by \delta B_\perp, but we expect the model to be quite generally applicable, e.g. for studying kinetic effects on MHD modes (including the effects of finite \delta B_\parallel).