Volume 74, Number 6, June 2006
|Page(s)||1027 - 1031|
|Section||Physics of gases, plasmas and electric discharges|
|Published online||10 May 2006|
Oblique electromagnetic instabilities for an ultra relativistic electron beam passing through a plasma
ETSI Industriales, Universidad de Castilla-La Mancha - 13071 Ciudad Real, Spain
Accepted: 13 April 2006
We present an investigation of the electromagnetic instabilities which are triggered when an ultra relativistic electron beam passes through a plasma. The linear growth rate is computed for every direction of propagation of the unstable modes, and temperatures are modelled using simple waterbag distribution functions. The ultra relativistic unstable spectrum is located around a very narrow band centered on a critical angle whose value is given analytically. The growth rate of modes propagating in this direction decreases like .
PACS: 52.35.Qz – Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.) / 52.40.Mj – Particle beam interactions in plasmas / 52.35.Hr – Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid)
© EDP Sciences, 2006
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