Existence of Metastable Kinetic Modes

C. Nguyen, H. Lütjens, X. Garbet, V. Grandgirard, and M. Lesur
Phys. Rev. Lett. 105, 205002 – Published 9 November 2010

Abstract

The nonlinear evolution of resonantly driven systems, such as suprathermal particle driven modes in magnetically confined plasmas, is shown to strongly depend on the existence and nature of an underlying damping mechanism. When background resonant damping is present, subcritical states can take place. In particular, purely nonlinear steady-state regimes are found, whose destabilization threshold and saturation levels are calculated and validated using numerical simulations. This nonlinear behavior can be of relevance for acoustic modes in magnetically confined plasmas.

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  • Received 2 May 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.205002

© 2010 The American Physical Society

Authors & Affiliations

C. Nguyen* and H. Lütjens

  • Centre de Physique Théorique, CNRS-Ecole Polytechnique, Palaiseau, France

X. Garbet and V. Grandgirard

  • CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France

M. Lesur

  • JAEA, Higashi-Ueno 6-9-3, Taitou, Tokyo, 110-0015, Japan

  • *christine.nguyen@cpht.polytechnique.fr

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Vol. 105, Iss. 20 — 12 November 2010

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