Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session 3
P 16.15: Poster
Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof
Scale-Resolved Multi-Field Experimental Investigation of Turbulence for the Validation of Gyrokinetic Simulations — •Klara Höfler1,2, Tim Happel2, Pascale Hennequin3, Pedro Molina Cabrera4, Tobias Görler2, Elisee Trier2, Ulrich Stroth1,2, and the ASDEX Upgrade Team2 — 1Physik Department TUM, E28, Garching, Germany — 2Max Planck Institut für Plasmaphysik, Garching, Germany — 3Laboratoire de Physique des Plasmas, Ecole Polytechnique, Palaiseau, France — 4MIT Plasma Science and Fusion Center, Cambridge, Massachusets, USA
Turbulence directly deteriorates the performance of fusion plasmas by causing significant particle and heat transport. The corresponding density and temperature fluctuations are measured on the ASDEX Upgrade tokamak via Doppler reflectometry, poloidal correlation reflectometry and a correlation electron cyclotron emission diagnostic. A long history of gyrokinetic validations showed a good agreement between individual experimental quantities and simulations. This contribution presents a plasma scenario designed for measurements of a large variety of turbulence quantitites at the same radial position and provides a powerful foundation for validation of codes. Detailed studies of density fluctuations such as wavenumber spectra, correlation lenghts radial and perpendicular to the confining magnetic field, turbulence decay times, the perpendicular velocity and spectra of perpendicular plasma flows are shown together with simulations done with the gyrokinetic code GENE. Particular emphasis is put on poloidally resolved perpendicular velocity measurements done with Doppler reflectometry.