Bremen 2017 – wissenschaftliches Programm
P 1.1: Hauptvortrag
Montag, 13. März 2017, 08:30–09:00, HS 2010
Using Fullwave Simulations to Understand the Turbulent Wavenumber Spectrum Measured by Doppler Reflectometry — •Carsten Lechte1, Garrard Conway2, Tobias Görler2, Tim Happel2, Carolin Tröster-Schmid2, and The ASDEX Upgrade Team2 — 1IGVP, Stuttgart University, 70569 Stuttgart, Germany — 2Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
Doppler reflectometry is used to measure the wavenumber spectrum of the turbulent density fluctuations in fusion plasmas. Experimental Doppler spectra and density spectra from turbulence simulations show marked differences in the position and shape of the inertial range of the turbulence.
Fullwave simulations of the reflectometer show the non-linear scattering properties of the plasma at the observed density fluctuation levels and can explain these differences. In addtion, experimental Doppler reflectometry spectra from ASDEX Upgrade show a significant difference between measurements done in X and O mode polarisation, even though the underlying turbulence is the same. Turbulence simulations, together with synthetic turbulence, are used to investigate these properties of the Doppler scattering process.