Ions motion effects on the full unstable spectrum in relativistic electron beam plasma interaction
- ETSI Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real (Spain) and Instituto de Investigaciones Energeticas y Aplicaciones Industriales, Campus Universitario de Ciudad Real, 13071 Ciudad Real (Spain)
A relativistic fluid model is implemented to assess the role of the ions motion in the linear phase of relativistic beam plasma electromagnetic instabilities. The all unstable wave vector spectrum is investigated, allowing us to assess how ion motions modify the competition between every possible instability. Beam densities up to the plasma one are considered. Due to the fluid approach, the temperatures must remain small, i.e., nonrelativistic. In the cold limit, ions motion affect the most unstable mode when the beam gamma factor {gamma}{sub b} > or approx. {alpha}M/mZ{sub i}, {alpha} being the beam to plasma density ratio, Z{sub i} the ion charge, M their mass, and m the electrons. The return current plays an important role by prompting Buneman-type instabilities which remain in the nonrelativistic regime up to high beam densities. Nonrelativistic temperatures only slightly affect these conclusions, except in the diluted beam regime where they can stabilize the Buneman modes.
- OSTI ID:
- 21069944
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 1; Other Information: DOI: 10.1063/1.2828607; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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