Asp, E.

Horton, W.

J.-H., Kim

Porte, L.

Infoscience - École polytechnique fédérale de Lausanne

Electron transport analysis in TCVW. Horton, J.-H. KimInstitute for Fusion Studies, University of Texas at AustinE. AspCRPP-EPFL, Association Euratom-Confe´de´ration SwisseWe have investigated the turbulent electron transport in the four currentH-mode phases of the TCV discharge 29892 with high-power ECH heating.On ion inertial length scale, we break down the dynamics into collisionlesswave, collisional drift wave and trapped electron mode(TEM) (Horton, Phys.Fluids 19, 711, 1976). The transition from drift wave to trapped electronmode is observed in our calculations, and the electron temperature gradientdestabilizes the TEM. We find that at the mid-radius, the TEM growth rateare strongly dependent on the collisionality whereas at the outer region, nocollisionality dependence is observed. we also analyze the ETG transportwith well-known theory based χe-models. Finally we show quasi-2D pseudospectrum simulations for several (r, t) points and time slices for the TEMmodel and the ETG model. Comparison suggests that the ETG mode is abetter candidate for the electron transport in the TCV discharge.1

Electron transport analysis in TCV

http://infoscience.epfl.ch/record/124728/files/078818601.pdf

Electron transport analysis in TCV

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Infoscience - École polytechnique fédérale de Lausanne