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Modeling of long range frequency sweeping for energetic particle modes

Robert Nyqvist (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; B. N. Breizman
Physics of Plasmas (1070-664X). Vol. 20 (2013), 4,
[Artikel, refereegranskad vetenskaplig]

Long range frequency sweeping events are simulated numerically within a one-dimensional, electrostatic bump-on-tail model with fast particle sources and collisions. The numerical solution accounts for fast particle trapping and detrapping in an evolving wave field with a fixed wavelength, and it includes three distinct collisions operators: Drag (dynamical friction on the background electrons), Krook-type collisions, and velocity space diffusion. The effects of particle trapping and diffusion on the evolution of holes and clumps are investigated, and the occurrence of non-monotonic (hooked) frequency sweeping and asymptotically steady holes is discussed. The presented solution constitutes a step towards predictive modeling of frequency sweeping events in more realistic geometries.

Nyckelord: clump pair creation, adiabatic-invariant, tae

Denna post skapades 2013-05-31. Senast ändrad 2015-04-13.
CPL Pubid: 177726


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi (2013-2017)



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