Communication Dans Un Congrès Année : 2012

Subcritical Growth of Coherent Phase-Space Structures

Résumé

In the presence of wave dissipation, phase-space structures emerge in nonlinear Vlasov dynamics. A new theory gives a simple relation between the growth of these coherent structures and wave energy. The structures can drive the wave by direct momentum exchange, which explains the existence of nonlinear instabilities in both barely unstable and linearly stable (subcritical) regimes. When dissipation is modeled by a linear term in the field equation, simple expressions of a single hole growth rate and of the initial perturbation threshold are in agreement with numerical simulations.

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hal-04969377 , version 1 (27-02-2025)

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Maxime Lesur, P.H. Diamond. Subcritical Growth of Coherent Phase-Space Structures. IAEA Fusion Energy Conference, International Atomic Energy Agency, Vienna (Austria), Oct 2012, San Diego (CA), France. ⟨hal-04969377⟩
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