PIC simulations of relativistic electron flows: The fastest-growing mixed mode and the electromagnetic finite grid instability
2007 (English)In: 34th European Physical Society Conference on Plasma Physics,2007, Warsaw: European Physical Society , 2007, P2.078- p.Conference paper (Refereed)
Instabilities driven by two electron beams that stream at the relativistic relative velocity vb are important as a plasma thermalization and magnetic field generation mechanism in astrophysics and in inertial confinement fusion. The time-evolution of such instabilities, which are subdivided into the two-stream, mixed mode and filamentation (beam-Weibel) instability, is multi-dimensional and nonlinear and the instabilities are usually modelled with particle-in-cell (PIC) simulations. We examine the wave spectrum we obtain, if both beams have a density ratio 9 and (1-vb^2/c^2)^(-1/2)=4. The mixed mode dominates and grows fastest for highly relativistic vb. An electromagnetic finite grid instability is shown to generate artificial magnetic fields, imposing a simulation constraint.
Place, publisher, year, edition, pages
Warsaw: European Physical Society , 2007. P2.078- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-38878Local ID: 46028OAI: oai:DiVA.org:liu-38878DiVA: diva2:259727