Göttingen 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.54: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Design system identification input or the dynamics of the radiated power in Wendelstein 7-X — •Anastasios Tsikouras, Felix Reimold, Maciej Krytzowiak, and Georg Schlisio — Max Planck Institute IPP, Greifswald, Germany

Heat dissipation from the plasma is critical for safe long-pulse operation and reactor-relevant scenarios in all magnetic confinement fusion devices. Impurity seeding in the edge region of the plasma dissipates a portion of its power in all directions by radiation. This action leads in reduced heat loads carried in the last plasma layer in contact with materials, as well as reduced plasma edge temperature. Efficient control of this radiated power necessitates a feedback control system. In Wendelstein 7-X stellarator we aim to design such a feedback system. The seeding actuator is a fast piezo-electric valve [1]. The recently operating divertor bolometry system will provide the radiated power signal. An effective controller requires identifying the dynamics of the investigated plant. This means how the output reacts to different input signals. The success of this identification depends highly on the input signal. For this purpose, we design a multisinusoidal input signal to excite the plant. We excite chosen frequencies within specified limits and perform system identification. The experimental time and the time constants of our system dictate these limits. Preliminary results show moderate but noticeable excitation of the system, with the quality evaluated by the coherence function. This function provides quantitative assessment of the excitation on a 0 to 1 scale. [1] Griener et al. Rev. Sci. Instrum. 88, 033509 (2017

Keywords: control; system identification; w7x; radiated power