https://doi.org/10.1140/epjd/e2014-50240-2
Regular Article
Bicoherence analysis of streamer dynamics induced by trapped ion modes*
1
LMFA, École Centrale de Lyon, Université de Lyon,
69134
Ecully,
France
2
CEA, IRFM, 13108
Saint-Paul-Lez-Durance,
France
3
Institut Jean Lamour-UMR 7168, Université de la
Lorraine, 54506
Nancy,
France
a e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
25
March
2014
Received in final form:
25
August
2014
Published online:
8
January
2015
Abstract
High order spectral analyses have recently attracted a great deal of attention in the context of experimental studies for magnetic fusion. Among these techniques, bicoherence analysis plays an important role as it allows distinguishing between spontaneously excited waves and waves that arise from a coupling between different modes linked to specific physical mechanisms. Here, we describe and apply bicoherence analysis to kinetic simulations performed with reduced “bounce-averaged gyrokinetic” code, in order to investigate the nonlinear dynamics of trapped ion modes. This analysis shows a nonlinear wave coupling process linked to the formation of convective cells, thus furthers our understanding of the nonlinear energy transfer between turbulence structures in tokamaks.
Contribution to the Topical Issue “Theory and Applications of the Vlasov Equation”, edited by Francesco Pegoraro, Francesco Califano, Giovanni Manfredi and Philip J. Morrison.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2015
