EPJ Web Conf.
Volume 277, 202321st Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC21)
|Number of page(s)||6|
|Published online||23 February 2023|
A model of non-Maxwellian electron distribution function for the analysis of ECE data in JET discharges
CEA, IRFM F-13108 Saint Paul-lez-Durance, France
2 United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK
3 ENEA Department Fusion and Technology for Nuclear Safety, C R Frascati, 00044 Frascati, Italy
4 National Fusion Laboratory, CIEMAT, Madrid, Spain
5 Istituto per la Scienza e Tecnologia dei Plasmi, CNR, 20125 Milano, Italy
6 EPFL, Swiss Plasma Center, CH-1015 Lausanne, Switzerland
7 Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany
8 Laboratory for Plasma Physics, LPP-ERM/KMS, Brussels, Belgium
* Corresponding author: firstname.lastname@example.org
a See J Mailloux et al., Nucl. Fusion 62, 042026 (2022)
Published online: 23 February 2023
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.
© The Authors, published by EDP Sciences, 2023
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