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P: Fachverband Plasmaphysik
P 15: Magnetic Confinement V & Helmholtz Graduate School V
P 15.2: Talk
Thursday, September 2, 2021, 17:00–17:25, H5
Investigation of increased core ion temperatures in high-beta advanced scenarios in ASDEX Upgrade — •Maximilian Reisner1, Jörg Stober1, Alessandro Di Siena2, Rainer Fischer1, Andreas Burckhart1, Alexander Bock1, Emiliano Fable1, Rachael McDermott1, Alejandro Bañon Navarro1, and the ASDEX Upgrade Team3 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München, Germany — 2UT Austin, 201 E 24th St, Austin, Texas, USA — 3See the author list of H. Meyer et al, Nucl. Fusion 59, 112014 (2019)
Non-inductive advanced scenarios are a possible way for future nuclear fusion power plants based on the tokamak design to run in non-pulsed operation. In these scenarios, the ohmic current is replaced by externally driven currents and the intrinsic bootstrap-current. Since the bootstrap-current is produced in the presence of pressure gradients, internal transport barriers or regions of reduced turbulent transport are favourable to such scenarios. Such local reductions in transport have been observed in non-inductive ASDEX Upgrade discharges. There are several parameters that are thought to be connected to local reductions of transport in the plasma core, such as the ExB-shear, the magnetic shear and the fast ion pressure. In this contribution, results of experiments conducted in the Tokamak ASDEX Upgrade will be presented, which aim to study the individual contributions of these parameters to the observed reductions in transport. These experimental findings are backed up by simulations using the quasilinear transport model TGLF and the gyrokinetic code GENE.