Turbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas

TitleTurbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas
Publication TypeJournal Article
Year of Publication2018
AuthorsN. Bonanomi, P. Mantica, A. Di Siena, E. Delabie, C. Giroud, T. Johnson, E. Lerche, S. Menmuir, M. Tsalas, D. Van Eester, JET Contributors
JournalNuclear Fusion
Volume58
Issue5
Pagination056025
Abstract

The first experimental demonstration that fast ion induced stabilization of thermal turbulent transport takes place also at low values of plasma toroidal rotation has been obtained in JET ILW (ITER-like wall) L-mode plasmas with high ( 3 He)-D ICRH (ion cyclotron resonance heating) power. A reduction of the gyro-Bohm normalized ion heat flux and higher values of the normalized ion temperature gradient have been observed at high ICRH power and low NBI (neutral beam injection) power and plasma rotation. Gyrokinetic simulations indicate that ITG (ion temperature gradient) turbulence stabilization induced by the presence of high-energetic 3 He ions is the key mechanism in order to explain the experimental observations. Two main mechanisms have been identified to be responsible for the turbulence stabilization: a linear electrostatic wave-fast particle resonance mechanism and a nonlinear electromagnetic mechanism. The dependence of the stabilization on the 3 He distribution function has also been studied.

DOI10.1088/1741-4326/aab733
Division

FP

Department

TP

PIDf281dab493139098fb7e4825444ddd5b
Alternate TitleNucl. Fusion
LabelOA
Attachment: 

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