Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 6: Helmholtz Graduate School I
P 6.3: Poster
Montag, 13. März 2017, 16:30–18:30, HS Foyer
Low-Z impurity transport studies using CXRS at ASDEX Upgrade — •Cecilia Bruhn1,2, Rachael McDermott1, Alexander Lebschy1,2, Ralph Dux1, Athina Kappatou1, Volodymyr Bobkov1, Roman Ochoukov1, Jakob Ameres2,1, Clemente Angioni1, Marco Cavedon1, Thomas Pütterich1, Eleonora Viezzer3,1, and the Asdex Upgrade Team1 — 1Max-Planck-Insitut für Plasmaphysik, Garching, Germany — 2Technische Universität München, Garching, Germany — 3University of Seville, Seville, Spain
To achieve optimum fusion performance, future fusion reactors need to control the build up of high- and low-Z impurities in the plasma core. Thus, it is important to develop and validate our theoretical understanding of impurity transport. Recent experimental work on this topic at ASDEX Upgrade (AUG) has focused primarily on steady-state profiles, which deliver the ratio of the diffusive and convective transport coefficients. However, from a time dependent density profile the transport coefficients can be separately determined by solving an inverse problem. At AUG, a sinusoidal modulation of the boron density can be achieved by modulating the power from the ion cyclotron resonance frequency (ICRF) antennas. This signal can then be monitored with the charge exchange recombination spectroscopy (CXRS) diagnostics, which can make complete measurements of the boron density profiles with high spatial and temporal resolution. We will present a database of measured transport coefficient profiles, their dependencies on local plasma parameters and a first comparison to neoclassical theory.