Erlangen 2026 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.74: Poster

Thursday, March 19, 2026, 13:45–15:45, Redoutensaal

ECRH power deposition measurements using ECE radiometers at W7-X — •Vaishnavi Murugesan, Matthias Hirsch, Gavin Weir, Torsten Stange, Juan Fernando Guerrero Arnaiz, Melina Arvanitou, Neha Chaudhary, Robert C Wolf, and the W7-X Team — Max Planck Institute for Plasma Physics

Electron Cyclotron Resonance Heating (ECRH) is a prominent heating scheme in many modern fusion devices. The narrow deposition width of ECRH makes it an effective tool for plasma profile shaping and turbulence control. The experimental validation of said narrow power deposition, however, has proved to be challenging, limited by the diagnostic capabilities and heat diffusion. ECRH modulation and switching experiments offer a unique way of deriving power deposition profiles in magnetically confined plasmas. ECRH modulation initiates perturbations in local electron temperature (Te) that are observed as an immediate response in the Electron Cyclotron Emission (ECE) signals. The instantaneous response of the ECE channels probing the magnetic flux surfaces in the vicinity of heating is used to derive power deposition profiles. This work presents narrow ECRH power deposition profiles measured using standalone calibrated ECE radiometers at Wendelstein 7-X (W7-X). Experimental results are discussed alongside mathematically derived ray-tracing profiles for plasma discharges from the experimental campaign 2.3 at W7-X.

Keywords: Electron Cyclotron Emission; Wendelstein 7- X; Electron Cyclotron Resonance Heating; Ray Tracing