Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement I - Helmholtz Graduate School III
P 7.2: Vortrag
Dienstag, 6. März 2018, 11:00–11:25, A 0.112
Core boron transport studies at ASDEX Upgrade — •Cecilia Bruhn1,2, Rachael McDermott1, Clemente Angioni1, Pierre Manas1, Alexander Lebschy1,2, Volodymyr Bobkov1, Roman Ochoukov1, Jakob Ameres2,1, Athina Kappatou1, Marco Cavedon1, Ralph Dux1, and the ASDEX Upgrade Team1 — 1Max Planck-Institut für Plasmaphysik, Garching, Germany — 2Technische Universität München, Garching, Germany
To achieve optimum fusion performance, future fusion reactors need to control the build up of both high- and low-Z impurities in the plasma core. At ASDEX Upgrade, a novel method of studying the boron transport has been developed and is being used to validate the theoretical understanding as well as the mechanisms behind low-Z impurity transport. This method utilizes the fact that a modulation of the power from the ion cyclotron resonance frequency antennae induces a modulation of the boron density, which can be measured with the charge exchange recombination spectroscopy diagnostics. This method allows D and v to be separately determined and it has been applied to a wide variety of plasma discharges. From this, a database of transport coefficients has been assembled. This database and how the transport coefficients depend on the local plasma parameters will be presented in this contribution as well as an in-depth comparison to theory. For the bulk of the database, there is quantitative agreement between the measured and the predicted theoretical diffusion coefficients. However, in all cases the convection is predicted to be more inward than is measured. These results and possible explanations will be discussed.