München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 7: Helmholtz Graduate School II - Magnetic Confinement I

P 7.4: Vortrag

Montag, 18. März 2019, 17:50–18:15, HS 21

Investigation of enhanced transport due to magnetic perturbations — •Nils Leuthold1,2, Wolfgang Suttrop1, Matthias Willensdorfer1, Marco Cavedon1, Mike Dunne1, Luis Gil3, Tim Happel1, Andrew Kirk4, Jose Vicente3, the ASDEX Upgrade Team5, and the EUROfusion MST1 Team61Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 2Ludwig-Maximilian-Universität, München, Germany — 3Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, Portugal — 4CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK — 5See the author list "H. Meyer et al 2019 Nucl. Fusion (in preparation)" — 6See the author list "H. Meyer et al 2017 Nucl. Fusion 57 102014"

Since Edge Localized Modes have the potential to damage the first wall in a tokamak, magnetic perturbations are currently investigated as a tool to mitigate or suppress them. At low collisionalities relevant for future fusion devices, magnetic perturbations also cause an enhancement of outward particle and heat transport.

The influence of this so called 'pump-out' effect on the temperature and density of the plasma is shown. Also, first insights into its driving mechanism are discussed. No significant increase of neoclassical transport due to field penetration to resonant magnetic surfaces at the pedestal top has been observed. However, broadband density fluctuations can be measured in the plasma edge. Their toroidal asymmetry is seen in scans of the surface corrugation of the perturbed 3D equilibrium.

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