Parametric excitation of ion density fluctuations in the relativistic beam-plasma interaction

1976 ◽  
Vol 19 (6) ◽  
pp. 849 ◽  
Author(s):  
H. Schamel ◽  
Y. C. Lee ◽  
G. J. Morales
Keyword(s):  
Parametric Excitation ◽  
Density Fluctuations ◽  
Ion Density ◽  
Plasma Interaction ◽  
Relativistic Beam ◽  
Beam Plasma

scholarly journals Ion dynamics in electron beam–plasma interaction: particle-in-cell simulations

2014 ◽  
Vol 32 (8) ◽  
pp. 1025-1033 ◽  
Author(s):  
K. Baumgärtel
Keyword(s):  
Electron Beam ◽  
Langmuir Wave ◽  
Density Fluctuations ◽  
Wave Number ◽  
Random Wave ◽  
Ion Density ◽  
Plasma Interaction ◽  
Particle In Cell ◽  
Beam Plasma ◽  
Electron Beam Plasma

Abstract. Electron beam–plasma interaction including ions is studied by particle-in-cell (PIC) simulations using a one-dimensional, electrostatic code. Evidence for Langmuir wave decay is given for sufficiently energetic beams, as in previous Vlasov–Maxwell simulations. The mechanism for the generation of localized finite-amplitude ion density fluctuations is analyzed. Amplitude modulation due to interference between the beam-generated Langmuir waves causes random wave localization including strong transient spikes in field intensity which create bursty ion density structures via ponderomotive forces. More dense beams may quench the decay instability and generate low-frequency variations dominated by the wave number of the fastest growing Langmuir mode.

Three regimes of relativistic beam - plasma interaction

2013 ◽  
Author(s):  
P. Muggli ◽  
B. Allen ◽  
Y. Fang ◽  
V. Yakimenko ◽  
M. Babzien ◽  
...  
Keyword(s):  
Plasma Interaction ◽  
Relativistic Beam ◽  
Beam Plasma

Generation of electromagnetic radiation in a relativistic beam-plasma interaction

1991 ◽  
Vol 156 (1-2) ◽  
pp. 76-80 ◽  
Author(s):  
M. Shoucri ◽  
P. Bertrand ◽  
A. Ghizzo ◽  
J. Lebas ◽  
T. Johnston ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Plasma Interaction ◽  
Relativistic Beam ◽  
Beam Plasma

scholarly journals Electron beam—plasma interaction in a dusty plasma with excess suprathermal electrons

2011 ◽  
Author(s):  
A. Danehkar ◽  
N. S. Saini ◽  
M. A. Hellberg ◽  
I. Kourakis ◽  
Vladimir Yu. Nosenko ◽  
...  
Keyword(s):  
Electron Beam ◽  
Dusty Plasma ◽  
Plasma Interaction ◽  
Suprathermal Electrons ◽  
Beam Plasma ◽  
Electron Beam Plasma

scholarly journals Electron beam relaxation in inhomogeneous plasmas

2013 ◽  
Vol 31 (8) ◽  
pp. 1379-1385 ◽  
Author(s):  
A. Voshchepynets ◽  
V. Krasnoselskikh
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Electron Beams ◽  
Inhomogeneous Plasma ◽  
Density Fluctuations ◽  
Langmuir Waves ◽  
Wave Trapping ◽  
Beam Plasma ◽  
Beam Plasma Instability ◽  
Accelerated Particles

Abstract. In this work, we studied the effects of background plasma density fluctuations on the relaxation of electron beams. For the study, we assumed that the level of fluctuations was so high that the majority of Langmuir waves generated as a result of beam-plasma instability were trapped inside density depletions. The system can be considered as a good model for describing beam-plasma interactions in the solar wind. Here we show that due to the effect of wave trapping, beam relaxation slows significantly. As a result, the length of relaxation for the electron beam in such an inhomogeneous plasma is much longer than in a homogeneous plasma. Additionally, for sufficiently narrow beams, the process of relaxation is accompanied by transformation of significant part of the beam kinetic energy to energy of accelerated particles. They form the tail of the distribution and can carry up to 50% of the initial beam energy flux.

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