Modeling of long range frequency sweeping for energetic particle modes
Artikel i vetenskaplig tidskrift, 2013

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.

clump pair creation




Robert Nyqvist

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

B. N. Breizman

The University of Texas at Austin

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 20