Jena 2013 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 21: Plasma- Wand- Wechselwirkung

P 21.2: Vortrag

Donnerstag, 28. Februar 2013, 17:00–17:15, HS 3

Redirection of impurity migration by increased ExB drift due to stochastic field lines — •Ruth Laengner, Oliver Schmitz, Andreas Kirschner, Sebastijan Brezinsek, Akadi Kreter, Sören Möller, Marko Laengner, Ulrich Samm, and and the TEXTOR Team — Institute of Energy and Climate Research - Plasma Physics, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, Partner in the Trilateral Euregio Cluster, Jülich, Germany

Resonant Magnetic Perturbations (RMPs) are one method for the control of the transport mechanisms in the plasma edge of fusion devices. Dedicated experiments for the investigation of material transport in such a perturbed boundary were performed at the tokamak TEXTOR. Spectroscopic measurements of light emission during the experiment and post mortem analysis with Nuclear Reaction Analysis (NRA) were employed. The light emission of low ionized carbon showed a tilt in 90 degrees during RMP application compared to the unperturbed case. However, former experiments show a rise in the radial electric field (E_r) and in consequence a larger E_rxB drift due to field line stochasticity induced by the RMPs. The quantitative change in E_r is capable to cause the observed effect in agreements with model predictions. NRA revealed a less pronounced tilt in the re-deposition pattern, which can be explained by the presence of neutrals being re-deposited. To verify the E_rxB drift as possible reason for the ion transport the impurity transport code ERO was used.