Bochum 2015 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session - Helmholtz Graduate School for Plasma Physics
P 16.18: Poster
Tuesday, March 3, 2015, 16:30–18:30, Foyer Audimax
Application of Radial Correlation Doppler Reflectometry on the ASDEX Upgrade tokamak — •J.R. Pinzón1,2, T. Happel1, P. Hennequin3, U. Stroth1,2, and The ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching — 2Physik-Department E28, TUM, D-85748 Garching — 3Laboratoire de Physique des Plasmas, Ecole Polytechnique, France
Doppler Reflectometry (DR) is a diagnostic used for the characterization of plasma density turbulence in magnetic confinement devices. It allows to measure the perpendicular propagation velocity of density fluctuations and their perpendicular wavenumber spectrum with good spatial resolution. By studying the correlation between signals of two reflectometers probing at different radial positions (Radial Correlation DR), it is possible to evaluate the radial correlation length Lr of the plasma turbulence by scanning the radial separation Δ r.
However, results from analytical calculations and two-dimensional full-wave simulations indicate that the Lr measurement by RCDR is not straightforward and might depend on factors such as plasma velocity, fluctuation amplitudes and probing beam angle. Experimental data from the ASDEX Upgrade tokamak are studied. An assessment of the viability of the use of different signals and analysis methods, including an evaluation of potential caveats, is given.