Hannover 2016 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Poster Session- Helmholtz Graduate School for Plasma Physics

P 5.24: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Modelling of Radial Correlation Doppler Reflectometry using 2D Full Wave Simulations: X- O-mode comparison — •J.R. Pinzon^1,2, T. Happel¹, E. Blanco³, T. Estrada³, P. Hennequin⁴, U. Stroth^1,2, and The ASDEX Upgrade Team¹ — ¹Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching — ²Physik-Department E28, TUM, D-85748 Garching — ³Laboratorio Nacional de Fusion, CIEMAT, 28040 Madrid, Spain. — ⁴Laboratoire de Physique des Plasmas, Ecole Polytechnique, France

The study of plasma turbulence is relevant for the development of a nuclear fusion reactor because it enhances the energy and particle transport in detriment of the confinement. Radial Correlation Doppler Reflectometry (RCDR) is a diagnostic used to study wavenumber (k_⊥) resolved density turbulence in fusion plasmas. Among other quantities, it gives an estimate of the radial correlation length L_r of the density fluctuations. Recent results using simple models and synthetic turbulence have shown that under certain conditions, it can be possible to measure elongation and tilting of the turbulent structures.

RCDR is simulated using a 2D Full Wave code which solves the Maxwell equations in a plasma. Synthetic turbulence, linear density profiles and parameters similar to the experiments are used. The suitability of X- and O-mode for RCDR is assessed, as well as the possibility of measuring L_r, elongation and tilting of the turbulent structures. A comparison with experimental data from the ASDEX Upgrade tokamak is presented, results from X- and O-mode RCDR at different k_⊥ are shown.