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P: Fachverband Plasmaphysik

P 25: Poster Session- Theory and Modelling

P 25.3: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Theory-based modeling of ohmic confinement parameters and impurity transport — •Ivan Erofeev, Emiliano Fable, and Clemente Angioni — Max-Planck-Institut für Plasmaphysik, Garching b. München, Deutschland

In L-mode Ohmic plasmas a transition between linear (LOC) and saturated (SOC) confinement regimes has been regularly observed as the density is raised. It is believed to be caused by a shift of the dominant turbulent mode from TEM to ITG. In some tokamaks, this is also accompanied by a flip in core plasma toroidal rotation direction from co- to counter-current. The value of the density at which this transition occurs was shown to depend on such basic regime parameters as the toroidal field and plasma current, as well as many others. In this work this dependence is studied using the ASTRA transport modeling system, extended with TGLF and NEO codes as modules. Other aspects of LOC-SOC transition including simulated turbulent mode spectra are shown. Another part of the work presented is dedicated to the modeling of the evolution of an impurity blob (on the example of Li pellet) as it penetrates the confinement region in typical deuterium plasma. One of the goals of this whole work is to validate the TGLF code against experiment in LOC-SOC relevance in the first part and on the impurity transport side in the second part, with the aim to arrive to full simulations including plasma rotation.