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

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

in Absorptivity / Cyclotrons / Distribution functions / Electron distribution / Electron energy / Emission / Plasma heating / Thomson scattering

2023

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

in Absorptivity / Cyclotrons / Distribution functions / Electron distribution / Electron energy / Emission / Plasma heating / Thomson scattering

2023

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

in Absorptivity / Cyclotrons / Distribution functions / Electron distribution / Electron energy / Emission / Plasma heating / Thomson scattering

2023

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Journal Article

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

Dumont, R.,

Maslov, M.,

Keeling, D.,

Van Eester, D.,

Senni, L.,

Garcia, J.,

Mailloux, J.,

Figini, L.,

Hobirk, J.,

Kappatou, A.,

Giruzzi, G.,

Schmuck, S.,

Orsitto, F.P.,

Mazzi, S.,

Challis, C.,

Garzotti, L.,

Fontana, M.,

Sozzi, C.,

de la Luna, E.,

Lerche, E.,

Maggi, C.,

Rimini, F.,

Frigione, D.

2023

Overview

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 2 nd and the 3 rd 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.

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Publisher

EDP Sciences

Subject

Absorptivity

/ Cyclotrons

/ Distribution functions

/ Electron distribution

/ Electron energy

/ Emission

/ Plasma heating