Erlangen 2026 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.22: Poster

Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal

Towards photonic radiometry: Electron Temperature and Density profiles from broadband ECE spectra — •Taurino Reichert¹, Dmitry Moseev¹, Sergiy Ponomarenko¹, Vessen Vasilev², Ruwan Udayanga², Peter Andrekson², Annina Moser³, and Benedikt Baeuerle³ — ¹Max Planck Institut für Plasmaphysik, Greifswald, Germany — ²Chalmers University of Technology, Göteborg, Sweden — ³Polariton Technologies AG, Adliswil, Switzerland

The trend towards higher magnetic fields in future fusion experiments adds complexity to the design of heterodyne Electron Cyclotron Emission (ECE) radiometers used for measurement of electron temperature (T_e) profiles. The evaluation of a single ECE harmonic might require the acquisition of a broadband signal, effectively calling for multi stage systems or multiple separate radiometers. This work outlines the development of a proof-of-concept single stage broadband radiometer at W7-X. Here, ECE spectra between 140 GHz to 220 GHz will be acquired through up-conversion to the Short Wavelength Infrared (SWIR) range around 1550 nm using a plasmonic Mach-Zehnder-Modulator (MZM). The optical signals will be evaluated with a SWIR spectrometer. T_e profiles are directly obtained from the optically thick second harmonic X-mode (X2) while n_e profiles are reconstructed from the optically thin third harmonic X-mode (X3) using the ray-tracing code TRAVIS. The diagnostic is expected to yield ECE spectra with a frequency resolution of 1 GHz. The time resolution is yet to be found, aiming at a range between 1 ms to 10 ms.

Keywords: Electron Cyclotron Emission; broadband radiometer; Mach Zehnder Modulator; Temperature profiles; Density profiles