Enhancement in the electromagnetic beam-plasma instability due to ion streaming
2012 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 78, 181-187 p.Article in journal (Refereed) Published
We investigate the Weibel instability in counterpropagating electron-ion plasmas with the focus on the ion contribution, considering a realistic mass ratio. A generalized dis- persion relation is derived from relativistic theory by assuming an initially anisotropic temperature, which is represented by a waterbag distribution in momentum space which shows an enhanced growth rate due to the ion response. Two-dimensional particle-in- cell simulations support the theoretical analysis, showing a further amplification of the magnetic field on the ion time scale. The effect of an initially anisotropic temperature is investigated showing that the growth rate is monotonously decreased if the transverse spread is increased. Nevertheless, the presence of ions generates that the instability can develop for significantly higher electron temperatures. Suppression of the oblique mode is also explored by introducing a parallel velocity spread.
Place, publisher, year, edition, pages
Cambridge University Press, 2012. Vol. 78, 181-187 p.
Research subject Physics
IdentifiersURN: urn:nbn:se:umu:diva-52679DOI: 10.1017/S0022377811000559OAI: oai:DiVA.org:umu-52679DiVA: diva2:506378