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Aspects of self-similarity of the filamentation instability
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.
Institute of Theoretical Physics IV Ruhr-University Bochum.
Institute of Theoretical Physics IV Ruhr-University Bochum.
School of Cosmic Physics Dublin Institute for Advanced Studies.
2007 (English)In: 34th European Physical Society Conference on Plasma Physics,2007, Warsaw: European Physical Society , 2007, P2.080- p.Conference paper (Refereed)
Abstract [en]

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.
Keyword [en]
plasma physics
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-38880Local ID: 46030OAI: diva2:259729
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-01-04

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Dieckmann, Mark E
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Visual Information Technology and Applications (VITA)The Institute of Technology
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