Electron transport in Tore Supra with fast wave electron heating

The hot electron plasmas (T-e> 2T(i)) in Tore Supra (Equipe Tore Supra (pre sented by R. Aymar) in Plasma Physics and Controlled Nuclear Fusion Researc h [Proc. 12th Int. Conf., Nice, 1988 (IAEA, Vienna, 1989), Vol. 1, p. 9]) d riven by fast wave electron heating (FWEH) are analyzed for thermal transpo rt. Both neoclassical and anomalous transport processes are taken into acco unt. The dominant power flow is through the electron channel of anomalous t hermal diffusivity. The electron and ion temperature gradient driven instab ilities are analyzed for a well documented discharge and shown to explain t he diffusivities inferred from the steady state power balance analysis. The discharges are maintained in a quasi-steady state for periods up to 100 gl obal energy replacement times. A large Tore Supra database is tested agains t two models for the turbulent electron thermal conductivity. Good correlat ion is obtained with an updated version of the collisionless skin depth for mula. The electrostatic turbulence-based formula for electron temperature g radient (ETG) mode performs poorly in the core but well in the outer plasma . The electromagnetic turbulence theory based formula for ETG mode is bench marked with the empirical Taroni-Bohm formula derived from Joint European T orus (JET) data. (C) 2000 American Institute of Physics. [S1070-664X(00)042 05-1].