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A model of non-Maxwellian electron distribution function for the analysis of ECE data in JET discharges

Giruzzi G.; Fontana M.; orsitto F.P.; de la Luna E.; Dumont R.; Figini L.; Maslov M.; Mazzi S.; Schmuck S.; Senni L.; Sozzi C.; Challis C.; Frigione D.; Garcia J.; Garzotti L.; Hobirk J.; Kappatou A.; Keeling D.; Lerche E.; Maggi C.; Mailloux J.; Rimini F.; Van Eester D.

Recent experiments performed in JET at high level of plasma heating, in preparation of, and during the DT campaign have shown significant discrepancies between electron temperature measurements by Thomson Scattering (TS) and Electron Cyclotron Emission (ECE). In order to perform a systematic analysis of this phenomenon, a simple model of bipolar distortion of the electron distribution function has been developed, allowing analytic calculation of the EC emission and absorption coefficients. Extensive comparisons of the modelled ECE spectra (at both the 2nd and the 3rd harmonic extraordinary mode) with experimental measurements display good agreement when bulk electron distribution distortions around 1-2 times the electron thermal velocity are used and prove useful for a first level of analysis of this effect.

ID 478864
DOI 10.1051/epjconf/202327703005
PRODUCT TYPE Conference Proceeding
LAST UPDATE 2023-03-08T16:18:29Z
TITLE Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium