SMuK 2023 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Magnetic Confinement IV/HEPP VI
P 14.5: Vortrag
Donnerstag, 23. März 2023, 12:45–13:10, CHE/0091
Model based optimization of Advanced Tokamak scenarios — •Raphael Schramm1, Alexander Bock1, Emiliano Fable1, Jörg Stober1, Simon van Mulders2, Maximilian Reisner1, Hartmut Zohm1, and the ASDEX Upgrade Team1 — 1Max-Planck Institut für Plasmaphysik, Garching, Germany — 2École Polytechnique Fédérale de Lausanne, Switzerland
Advanced Tokamak scenarios increase the plasma safety factor (q) profile via external actuators in order to increase the bootstrap current, thereby reducing the inductive current fraction. In order to avoid an intermittent drop in q the actuators need to be applied already during the current ramp-up. A model in the transport code ASTRA, capable of predicitvely designing such a scenario by calculating temperature and q profiles based on the actuator setup has been developed and validated on AUG.
A scenario, considerably different from the validation case has been analyzed. In order to increase magnetohydrodynamic stability, the q-profile has been optimized. This is done by using an optimizer, running on simpler model to propose changes, which are then double-checked in the ASTRA model. Effects of the plasma current on stability and the performance of different setups have been explored. Results of the last AUG campaign will be shown.
The model can also be applied on different devices with minor changes. Results for JET, based on data from previous shots will be shown. Using the model to design a scenario to show the flux-pumping phenomenon on a larger device for the first time is planned.