München 2019 – wissenschaftliches Programm
P 18.53: Poster
Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax
Impact of edge plasma phenomena on the scintillator pattern of the i-HIBP diagnostic — •Viktoriia Olevskaia1,2, Gregor Birkenmeier1,2, Joaquin Galdon-Quiroga1, Elisabeth Wolfrum1, Ulrich Stroth1,2, and the ASDEX Upgrade Team1 — 1Max Planck Institute for Plasma Physics, Garching 85748, Germany — 2Physik-Department E28, Technical University Munich, 85748 Garching, Germany
The imaging Heavy Ion Beam Probe (i-HIBP) is a new powerful diagnostic based on a neutral heavy ion beam and a scintillator detector, which is currently under construction for the ASDEX Upgrade tokamak. This diagnostic has the potential to detect perturbations of density, poloidal magnetic field, and plasma potential. Potential and magnetic field perturbations cause spatial shifts of the ion trajectories and thus change the shape of the pattern on the scintillator detector, while density perturbations modify the intensity of the scintillator signal. This knowledge allows us to investigate edge instabilities and turbulent flows in magnetically confined plasmas. Simulations using a full-orbit calculating code including beam attenuation effects were conducted to predict the scintillator pattern generated by different physical phenomena like instabilities or a transport barrier which are know to influence plasma edge confinement. To distinguish the different phenomena, their temporal and spatial scales are taken into account. In the presented work, results of perturbation amplitude estimations as well as simulations of the expected scintillator patterns for different phenomena are presented.