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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.27: Poster
Tuesday, March 29, 2022, 16:00–17:30, P
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 aim to reduce the reliance on ohmic current of plasma discharges. This is done by increasing the bootstrap current (jbs ∝ q∇ p) with manipulation of the safety factor profile q via external actuators. These can be turned on during the plasma ramp-up, which avoids the safety factor dropping below the desired value, compared to the conventional option to wait until the plasma reaches a stationary state. Last year an ASTRA model has been presented that can be used to the develop such a scenario.
The model has been used to analyze a counter-ECCD scenario with a higher current than the validation scenario. Results of this will be shown. An optimizer, working on a simplified model will be used to improve this scenario. It proposes a change, which is then cross-checked in the ASTRA model in an iterative learning approach. Results will be run in the next ASDEX-U campaign.
In this campaign, a system capable of calculating the safety factor profile in real-time will become available. This contribution will discuss, if accuracy and reliability of such scenarios can be improved by using feed-forward control based on q instead of time.
Real-time control of the q-profile based on this tool will be tested.