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SMuK 2021 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Poster I

P 5.19: Poster

Dienstag, 31. August 2021, 14:00–16:00, P

Development of a model based early heating advanced scenario for ASDEX-Upgrade — •Raphael Schramm, Alexander Bock, Maximilian Reisner, Jörg Stober, Hartmut Zohm, and The ASDEX Upgrade Team — Max-Planck Institut für Plasmaphysik, Garching, Germany

Advanced Tokamak scenarios offer improved stability, confinement and pulse length compared to standard scenarios due to an increase of the plasma’s bootstrap current (jbsqp). They are accessed by manipulating the safety factor profile q through external actuators, which can be applied during the current ramp-up (early heating), or after an equilibrium is reached (late heating). The former allows for a longer discharge and more varied current distributions, but due to the volatility of the early plasma, creating such a scenario experimentally, with feed-forward control usually takes a lot of trial and error.

To combat this, a model, capable of predicting the plasma response to actuator changes with reasonable accuracy and a run-time of only a few minutes, has been developed in the transport code ASTRA. It includes Gyro-Bohm based core transport, edge transport according to a recently developed scaling law as well as the L/H-transition based on the heating power at the separatrix. Multiple fitting factors have been scaled according to a set of reference discharges and a good agreement between simulation and experiment has been achieved.

Using this model, an advanced scenario with early heating and an elevated q-profile has been developed and successfully tested at ASDEX-Upgrade.

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