UW-CPTC 07-5 Paleoclassical Electron Heat Transport Model

The paleoclassical model for radial electron heat transport in tokamak plasmas has been developed in a number of papers over the past few years. In order to facilitate numerical evaluation of it in plasma transport codes, this report summarizes its parameters, formulas and limits in particular regimes. A hierarchy of levels of the paleoclassical model are specified for interpretive (1) and predictive (2) transport codes: A) basic electron heat diffusivity χ e , B) effective power balance χ ePB, C) internal transport barriers around low order rational surfaces, and D) different radial transport operator 〈∇· q e 〉 that naturally embodies heat pinch effects. The approximations and limitations of the model are also discussed. Finally, possible future extensions of the paleoclassical model to other plasma transport processes, particularly density transport, and separatrix regions of divertor plasmas are discussed. ∗[email protected]; www.cae.wisc.edu/~callen