Electron and ion kinetic effects in the saturation of a driven ion acoustic wave

Riconda, C.; Héron, A.; Pesme, D.; Hüller, S.; Tikhonchuk, V. T.; Detering, F.

doi:10.1063/1.2132272

Cited by 20 publications

(6 citation statements)

References 34 publications

(50 reference statements)

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“…Our collisionless and noiseless (to machine precision) Vlasov simulations are 2D+2V (two configuration space + two velocity space dimensions). The results obtained reveal a picture of IAW decay that is qualitatively different from previous 2D numerical [9][10][11][12][13] and theoretical [12][13][14] treatments where the electrons were not treated as kinetic, reveal decay processes not captured by fully kinetic 1D simulations [15][16][17][18], and allow measurement of linear growth rates not possible in previous fully kinetic 2D/3D simulations [19] due to discrete particle noise.…”

contrasting

confidence: 79%

Longitudinal and Transverse Instability of Ion Acoustic Waves

et al. 2017

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Ion acoustic waves are found to be susceptible to at least two distinct decay processes. Which process dominates depends on the parameters. In the cases examined, the decay channel where daughter modes propagate parallel to the mother mode is found to dominate at larger amplitudes, while the decay channel where the daughter modes propagate at angles to the mother mode dominates at smaller amplitudes. Both decay processes may occur simultaneously and with onset thresholds below those suggested by fluid theory, resulting in the eventual multidimensional collapse of the mother mode to a turbulent state.

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contrasting

confidence: 79%

Longitudinal and Transverse Instability of Ion Acoustic Waves

et al. 2017

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“…Figure 8 shows the comparison of the full-Vlasov simulation (red dots) and the hybrid-Vlasov (blue dots) simulation. It is found that electron kinetic effects will promote the TID process, which is in agreement with earlier results reported in [73,74].…”

Section: Merge Mechanism-growth Of Subharmonics Induced By Tid Instab...supporting

confidence: 92%

Vortex merging in ion phase-space induced by two-ion decay instability

Liu

Wang

et al. 2023

Plasma Phys. Control. Fusion

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We theoretically and numerically study the merger phenomenon of the ion-phase vortex structure in hydrogen plasma. The results indicate that the merging of vortex structures during the nonlinear evolution of ion-acoustic waves mainly owing to two-ion decay (TID) instability. When the daughter ion-acoustic waves of TID grow to be comparable to the fundamental mode, vortex merging will occur. Furthermore, the vortex-merging can abruptly convert the significant energy of the fundamental mode into subharmonic energy to result in saturation for the TID of the fundamental mode. After several vortex-merging processes, the system eventually evolves into a turbulent state. Particularly, the model of the TID growth rate has been improved by considering two additional second-order coupling terms in this paper, which agree with the simulation results much better. Finally, the importance of the electron kinetic effects in the TID process is also presented by comparing between Hybrid-Vlasov and Full-Vlasov simulations.

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“…Both reflectivity images show a drop in reflectivity near the end of the simulation. In both cases a decay of the SBS driven IAW in fractional harmonics of the primary wave [20,24,[71][72][73][74][75][76][77][78][79] takes place and induces SBS saturation. However, the decay modes are not the same for the two cases.…”

Section: Low K Epw λ D -Regimementioning

confidence: 99%

“…One can also observe that the slope of the ω-k diagram is less steep the long plasma case, consistent with an increased value of the ion-acoustic velocity due to electron heating. SBS saturation is also partially related to ion and electron kinetic effects and their interplay with the IAW decay into fractional harmonics [74,75] , and discussed in more detail in recent studies including 1D and 2D simulations [24,[78][79][80] . In fact, there is no fundamental difference between the two cases when analysing the ion phase space.…”

Section: Low K Epw λ D -Regimementioning

confidence: 99%

Raman–Brillouin interplay for inertial confinement fusion relevant laser–plasma interaction

Riconda

Weber

2016

High Pow Laser Sci Eng

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The co-existence of the Raman and Brillouin backscattering instability is an important issue for inertial confinement fusion. The present paper presents extensive one-dimensional (1D) particle-in-cell (PIC) simulations for a wide range of parameters extending and complementing previous findings. PIC simulations show that the scenario of reflectivity evolution and saturation is very sensitive to the temperatures, intensities, size of plasma and boundary conditions employed. The Langmuir decay instability is observed for rather small k epw λ D but has no influence on the saturation of Brillouin backscattering, although there is a clear correlation of Langmuir decay instability modes and ion-fractional decay for certain parameter ranges. Raman backscattering appears at any intensity and temperature but is only a transient phenomenon. In several configurations forward as well as backward Raman scattering is observed. For the intensities considered, I λ 2 o above 10 15 W µm 2 /cm 2 , Raman is always of bursty nature. A particular setup allows the simulation of multi-speckle aspects in which case it is found that Raman is self-limiting due to strong modifications of the distribution function. Kinetic effects are of prime importance for Raman backscattering at high temperatures. No unique scenario for the saturation of Raman scattering or Raman-Brillouin competition does exist. The main effect in the considered parameter range is pump depletion because of large Brillouin backscattering. However, in the low k epw λ D regime the presence of ion-acoustic waves due to the Langmuir decay instability from the Raman created electron plasma waves can seed the ion-fractional decay and affect the Brillouin saturation.

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Electron and ion kinetic effects in the saturation of a driven ion acoustic wave

Cited by 20 publications

References 34 publications

Longitudinal and Transverse Instability of Ion Acoustic Waves

Longitudinal and Transverse Instability of Ion Acoustic Waves

Vortex merging in ion phase-space induced by two-ion decay instability

Raman–Brillouin interplay for inertial confinement fusion relevant laser–plasma interaction

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