Island Stability in Phase Space

A. V. Dudkovskaia, X. Garbet, M. Lesur, H. R. Wilson

Research output: Contribution to journalConference articlepeer-review


Starting with a conventional bump on tail problem, which is equivalent to finding a solution of the Vlasov/Fokker-Planck equation in the presence of the phase space island, we obtain a primary equilibrium state. The stability of this state is investigated as a function of the effective velocity-space drag and diffusion, as well as the width of these phase space islands. The secondary instabilities have been found in a certain range of plasma parameters and wave numbers. Solving the full Vlasov/Fokker-Planck - Poisson system, we obtain the dispersion function, which provides information about the secondary mode onset and allows an estimate of the secondary mode growth rate for different input plasma parameters.

Original languageEnglish
Article number012009
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 23 Nov 2018
Event2018 Joint Varenna-Lausanne International Workshop on the Theory of Fusion Plasmas - Varenna, Italy
Duration: 27 Aug 201831 Aug 2018

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