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Mainz 2022 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.27: Poster

Dienstag, 29. März 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 Team11Max-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 (jbsqp) 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.

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