Vlasov simulation of Langmuir wave packets

Umeda, Takayuki

doi:10.5194/npg-14-671-2007

Cited by 15 publications

(16 citation statements)

References 31 publications

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“…The saturation of the beam instability has recently been studied in great detail by many authors using PIC and Vlasov simulations [e.g., Kasaba et al ., ; Matsukyio et al ., ; Silin et al ., ; Umeda , ]. The characteristic signatures of the transition from beam instability to a saturated state can be described as follows: Langmuir waves are excited if the velocity of the beam electrons is in resonance with the phase velocity of the waves.…”

Section: Langmuir Oscillations In Plasmas With Plateau Distributionsmentioning

confidence: 99%

Current‐driven Langmuir oscillations and amplitude modulations—Another view on electron beam‐plasma interaction

Sauer

Sydora

2015

JGR Space Physics

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The origin of Langmuir amplitude modulations and harmonic waves observed in the solar wind and in planetary foreshock regions is investigated in beam plasmas where the saturation process of the beam instability is accompanied with the formation of a plateau distribution. This saturated state represents a current which is shown to drive homogeneous electric field oscillations at the plasma frequency. This simple mechanism has been ignored in most numerical studies based on Vlasov or particle-in-cell simulations because of the use of the Poisson equation which is not suitable to describe the mechanism of current drive in plasmas with immobile ions; instead, Ampere's law must be used. A simple fluid description of stable plateau plasmas, coupled with Ampere's law, is applied to illustrate the basic elements of current-driven Langmuir oscillations. If beam-generated Langmuir/electron-acoustic waves with frequencies above or below the plasma frequency are simultaneously present, beating of both wave modes leads to Langmuir amplitude modulations, thus providing an alternative to parametric decay. Furthermore, very important implications of our studies (presented separately) concern the electrostatic and electromagnetic second harmonic generation by nonlinear interaction of Langmuir oscillations with finite wave number modes which are driven by the plateau current as well.

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Section: Langmuir Oscillations In Plasmas With Plateau Distributionsmentioning

confidence: 99%

Current‐driven Langmuir oscillations and amplitude modulations—Another view on electron beam‐plasma interaction

Sauer

Sydora

2015

JGR Space Physics

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“…2005; Baumgärtel, 2013) and electrostatic Vlasov simulations (Umeda, 2006;Silin et al, 2007;Umeda, 2007;Umeda and Ito, 2008;Daldorff et al, 2011;Sauer and Sydora, 2012). Studies which include ion dynamics (in some cases with a reduced proton-to-electron mass ratio) show clearly that the heavy particles indeed contribute to the evolution of the instability.…”

Section: K Baumgärtel: Ion Dynamics In Electron Beam-plasma Interactionmentioning

confidence: 99%

“…Studies which include ion dynamics (in some cases with a reduced proton-to-electron mass ratio) show clearly that the heavy particles indeed contribute to the evolution of the instability. Evidence was given for the classical Langmuir decay instability to occur for sufficiently energetic beams (Umeda, 2007;Umeda and Ito, 2008).…”

Section: K Baumgärtel: Ion Dynamics In Electron Beam-plasma Interactionmentioning

confidence: 99%

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

Baumgärtel

2014

Ann. Geophys.

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Abstract. Electron beam-plasma interaction including ions is studied by particle-in-cell (PIC) simulations using a onedimensional, 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.

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“…Since the development of beam-plasma instability in such a problem requires larger plasma lengths, numerical experiments on the beam injection have been previously limited to either 1D Vlasov [1][2][3] or 2D particle-in-cell (PIC) simulations [4][5][6][7][8]. The more complex case of low-density relativistic beam has been studied only in 1D even in the PIC approach [9].…”

Section: Introductionmentioning

confidence: 99%

Simulations of electromagnetic emissions produced in a thin plasma by a continuously injected electron beam

2016

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In this paper, electromagnetic emissions produced in a thin beam-plasma system are studied using two-dimensional particle-in-cell simulations. For the first time, the problem of emission generation in such a system is considered in the realistic formulation allowing for the continuous injection of a relativistic electron beam through the plasma boundary. Specific attention is given to the thin plasma case in which the transverse plasma size is comparable to the typical wavelength of beam-driven oscillations. Such a case is often implemented in laboratory beam-plasma experiments and has a number of peculiarities. Emission from a thin plasma does not require intermediate generation of electromagnetic plasma eigenmodes, as in the infinite case, and is more similar to the regular antenna radiation. In this work, we determine how efficiently the fundamental and second harmonic emissions can be generated in previously modulated and initially homogeneous plasmas.

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Vlasov simulation of Langmuir wave packets

Cited by 15 publications

References 31 publications

Current‐driven Langmuir oscillations and amplitude modulations—Another view on electron beam‐plasma interaction

Current‐driven Langmuir oscillations and amplitude modulations—Another view on electron beam‐plasma interaction

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

Simulations of electromagnetic emissions produced in a thin plasma by a continuously injected electron beam

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