I1-S1 · Comparative studies of nonlinear ITG and ETG dynamics

Zonca, Rowena1)

1) E.N.E.A. Centro Ricerche Energia Frascati

Abstract

It is shown that the ITG-ETG symmetry is nonlinearly broken due to the different response of respectively electrons and ions to Zonal Flows (ZF). ITG is dominated by ITG-ZF nonlinear interactions and turbulence spreading, resulting in size-scaling of the associated turbulent transport. Meanwhile, nonlinear toroidal mode coupling dominates ETG saturation and ETG-ZF interactions enter on the longest nonlinear time scale only. The ETG turbulent transport level is smaller than values of experimental relevance.

 

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