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Adiabatic Description of Long Range Frequency Sweeping

Robert Nyqvist (Institutionen för rymd- och geovetenskap, Icke-linjär elektrodynamik) ; Matthew Lilley (Institutionen för rymd- och geovetenskap, Icke-linjär elektrodynamik) ; B.N. Breizman
12th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems / 5th IAEA Technical Meeting on Theory of Plasma Wave Instabilities. Austin, Texas, USA, 05-11 september, 2011 (0029-5515). Vol. 52 (2012), 9,
[Konferensbidrag, refereegranskat]

A theoretical framework is developed to describe long range frequency sweeping events in the 1D electrostatic bump-on-tail model with fast particle sources and collisions. The model includes three collision operators (Krook, drag (dynamical friction) and velocity space diffusion), and allows for a general shape of the fast particle distribution function. The behaviour of phase space holes and clumps is analysed in the absence of diffusion, and the effect of particle trapping due to separatrix expansion is discussed. With a fast particle distribution function whose slope decays above the resonant phase velocity, hooked frequency sweeping is found for holes in the presence of drag collisions alone.



Denna post skapades 2012-01-17. Senast ändrad 2014-09-02.
CPL Pubid: 153257

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Icke-linjär elektrodynamik (2010-2012)

Ämnesområden

Icke-linjär dynamik, kaos

Chalmers infrastruktur