Modeling of long range frequency sweeping for energetic particle modes

Journal Article · Mon Apr 15 04:00:00 EDT 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4799781· OSTI ID:22130417

Nyqvist, R. M. ^[1]; Breizman, B. N. ^[2]

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1. Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Goeteborg (Sweden)
2. Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712 (United States)

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.

• OSTI ID: 22130417
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 20; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COLLISIONS
DIFFUSION
DRAG
ELECTRONS
FRICTION
GEOMETRY
HOLES
NUMERICAL ANALYSIS
NUMERICAL SOLUTION
ONE-DIMENSIONAL CALCULATIONS
PARTICLE SOURCES
PARTICLES
PLASMA
PLASMA INSTABILITY
PLASMA SIMULATION
RADIATION PRESSURE
TRAPPING
VELOCITY