Greifswald 2024 – scientific programme
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P: Fachverband Plasmaphysik
P 25: Poster III
P 25.11: Poster
Thursday, February 29, 2024, 16:30–18:30, ELP 6: Foyer
Development of real-time control scheme for power exhaust via impurity seeding in Wendelstein 7-X — •Anastasios Tsikouras1,3, Felix Reimold3, Gabriele Partesotti3, Matthijs van Berkel2, Jesse T.W. Koenders1,2, Victoria Winters3, Valeria Perseo3, Daihong Zhang3, Marco de Baar1,2, and W7-X Team3 — 1Eindhoven University of Technology, Eindhoven, Netherlands — 2DIFFER, Eindhoven, Netherlands — 3Max Planck Institute of Plasma Physics, Greifswald, Germany
In Wendelstein 7-X (W7-X) real-time control of operational parameters is crucial for the performance of the stellarator. The radiated power is such an operational parameter that can be controlled with injection of gaseous impurities (seeding). This contribution identifies the seeding-radiation dynamics, from the latest W7-X experiments, and optimizes controller parameters for specific operating conditions.
In W7-X, bolometers are used for calculating the total radiated power, which is assessed for control purposes. First, the seeding-radiation response is identified and modelled, by analysing square wave seeding pulses. Then simulations on the dynamics models, show the response of the system and its limits. An error of less than 1% in under 200 milliseconds in tracking a unit step reference is possible for optimized controller parameters, whereas different operational conditions require different control parameters to achieve optimal performance in terms of tracking accuracy and speed. Finally, we outline proposals for the input signal in perturbative experiments to accurately identify the W7-X radiation dynamics in future experiments.
Keywords: W7-X; control; system identification; plasma dynamics