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  • Trapped electron mode driven electron heat transport in JET: experimental investigation and gyro-kinetic theory validation
    Bonanomi, Nicola ...
    PAPER Trapped electron mode driven electron heat transport in JET: experimental investigation and gyro-kinetic theory validation N. Bonanomi1,2, P. Mantica1, G. Szepesi1,6, N. Hawkes6, E. Lerche3, P. ... Migliano4, A. Peeters4, C. Sozzi1, M. Tsalas5,6, D. Van Eester3Show full author list Published 24 September 2015 % © 2015 EURATOM Nuclear Fusion, Volume 55, Number 11 Article PDF Figures References Citations 231 Total downloads Cited by 1 articles Turn on MathJax Share this article Article information Abstract The main purpose of this work is to study the dependence of trapped electron modes (TEM) threshold and of electron stiffness on the most relevant plasma parameters. Dedicated transport experiments based on heat flux scans and Te modulation have been performed in JET in TEM dominated plasmas with pure ICRH electron heating and a numerical study using gyrokinetic simulations has been performed with the code GKW. Using multilinear regressions on the experimental data, the stabilizing effect of magnetic shear predicted by theory for our plasma parameters is confirmed while no significant effect of safety factor was found. Good quantitative agreement is found between the TEM thresholds found in the experiments and calculated with linear GKW simulations. Non-linear simulations have given further confirmation of the threshold values and allowed comparison with the values of stiffness found experimentally. Perturbative studies using RF power modulation indicate the existence of an inward convective term for the electron heat flux. Adding NBI power, ion temperature gradient (ITG) modes become dominant and a reduction of $|\nabla {{T}_{e}}|/{{T}_{e}}$ with respect to pure ICRH, TEM dominant discharges has been experimentally observed, in spite of increased total electron power. Possible explanations are discussed.
    Source: Nuclear fusion. - ISSN 0029-5515 (Iss. 11, Vol. 55, 2015, 113016)
    Type of material - article, component part
    Publish date - 2015
    Language - english
    COBISS.SI-ID - 30187047
    DOI

source: Nuclear fusion. - ISSN 0029-5515 (Iss. 11, Vol. 55, 2015, 113016)
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