Aspects of self-similarity of the filamentation instability
2007 (English)In: 34th European Physical Society Conference on Plasma Physics,2007, Warsaw: European Physical Society , 2007, P2.080- p.Conference paper (Refereed)
The filamentation instability (FI) is an aperiodically growing instability driven by counterpropagating electron beams. Its ability to generate magnetic fields is important for the energetic plasmas in gamma ray burst jets and inertial confinement fusion plasmas. The FI has been examined both analytically and with particle-in-cell (PIC) simulations. We perform PIC simulations and follow the FI through its nonlinear saturation. The power spectrum of the flow-aligned current component is self-similar during the linear phase. We show that the perpendicular current distribution is self-similar during the nonlinear evolution and that the filament size increases linearly with time. We demonstrate that, at least for warm plasmas, the current filaments can't be described by simple flux tubes. Instead, the filaments merge by magnetic reconnection to form larger, partially overlapping current sheets. In the filament overlap region the electrons are accelerated.
Place, publisher, year, edition, pages
Warsaw: European Physical Society , 2007. P2.080- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-38880Local ID: 46030OAI: oai:DiVA.org:liu-38880DiVA: diva2:259729