Low-Level Saturation of Brillouin Backscattering due to Cavity Formation in High-Intensity Laser-Plasma Interaction

Weber, S.; Riconda, C.; Tikhonchuk, V. T.

doi:10.1103/physrevlett.94.055005

Cited by 48 publications

(33 citation statements)

References 14 publications

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“…The total electric field acting locally on the atoms might therefore differ substantially from the laser field in vacuum. Depending on laser parameters, the density fluctuations driven by the parametric processes attain values far above the thermal fluctuations, can be of the order of magnitude of the original plasma density and even attain the critical density value in the case of an originally undercritical density [29]. The field, density and possibly the temperature fluctuations concomitant with the creation of suprathermal electrons and ions may strongly affect the energy levels distribution and transitions probabilities in the perturbed plasma.…”

Section: Impact Of Laser-plasma Interaction On Distribution Of Electrmentioning

confidence: 96%

“…10 The preformed plasma profile and parameters required as an input for the PIC simulations were provided by the CHIC code [23]. The hydrodynamic simulations show little variation of the temperature across the profile; in any case, our previous experience with the PIC simulations indicates that the dominant parameter influencing the interaction physics is the maximum density [29]. Indeed, Fig.…”

Section: Impact Of Laser-plasma Interaction On Distribution Of Electrmentioning

confidence: 99%

“…It is well known that laser-plasma interaction changes the local electric field intensity and affects the plasma properties. Collective processes such as stimulated Raman (SRS) and Brillouin (SBS) backscattering excite high-frequency plasma oscillations and low-frequency ion-plasma oscillations, respectively [29]. These parametric instabilities are responsible for backscattering of the incident laser intensity, leading to a superposition of two electric fields.…”

Section: Impact Of Laser-plasma Interaction On Distribution Of Electrmentioning

confidence: 99%

See 2 more Smart Citations

Signature of externally introduced laser fields in X-ray emission of multicharged ions

Renner

Sauvan²,

Dalimier

et al. 2009

High Energy Density Physics

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Section: Impact Of Laser-plasma Interaction On Distribution Of Electrmentioning

confidence: 96%

Section: Impact Of Laser-plasma Interaction On Distribution Of Electrmentioning

confidence: 99%

Section: Impact Of Laser-plasma Interaction On Distribution Of Electrmentioning

confidence: 99%

See 1 more Smart Citation

Signature of externally introduced laser fields in X-ray emission of multicharged ions

Renner

Sauvan²,

Dalimier

et al. 2009

High Energy Density Physics

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“…[1][2][3][4][5] In 1D simulations of SBBS, the inclusion of kinetic electrons has made a difference in the saturation of SBBS. 16,17 Rambo, Wilks, and Kruer undertook hybrid simulations (fluid electrons and particle-in-cell ions) of SBBS including ion-ion collisions in one spatial dimension. 18 They observed that collisions affect the ions resonant with the SBBS ion waves so as to inhibit the flattening of the ion velocity distribution function due to trapping and thermalize the ion wave energy and the hot ion tail into the bulk ion velocity distribution.…”

Section: Introductionmentioning

confidence: 99%

Effects of ion-ion collisions and inhomogeneity in two-dimensional kinetic ion simulations of stimulated Brillouin backscattering

et al. 2006

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Langdon, and E.A. Williams, Phys. Plasmas 4, 956 (1997)] hybrid code (kinetic particle ions and Boltzmann fluid electrons) have been used to investigate the saturation of stimulated Brillouin backscatter (SBBS) instability including the effects of ion-ion collisions and inhomogeneity. Ion-ion collisions tend to increase ion-wave dissipation, which decreases the gain exponent for stimulated Brillouin backscattering; and the peak Brillouin backscatter reflectivities tend to decrease with increasing collisionality in the simulations. Two types of Langevin-operator, ion-ion collision models were implemented in the simulations. In both models used the collisions are functions of the local ion temperature and density, but the collisions have no velocity dependence in the first model. In the second model, the collisions are also functions of the energy of the ion that is being scattered so as to represent a Fokker-Planck collision operator. Collisions decorrelate the ions from the acoustic waves in SBS, which disrupts ion trapping in the acoustic wave. Nevertheless, ion trapping leading to a hot ion tail and two-dimensional physics that allows the SBS ion waves to nonlinearly scatter remain robust saturation mechanisms for SBBS in a high-gain limit over a range of ion collisionality. SBS 2 backscatter in the presence of a spatially nonuniform plasma flow is also investigated.Simulations show that depending on the sign of the spatial gradient of the flow relative to the backscatter, ion trapping effects that produce a nonlinear frequency shift can enhance (auto-resonance) or decrease (anti-auto-resonance) reflectivities in agreement with theoretical arguments. PACS: 52.38.-r 52.65.Rr 3

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“…Intensities above the incident intensities are possible as the backscattered pulse is bursty and can undergo amplification, i.e., it takes up energy from the still ongoing incident laser pulse. This phenomenon is known for both, SRS [60] and SBS [61][62][63] . As expected, as the electron temperature T e increases SRS decreases.…”

Section: Boundary Conditions and Their Possible Physical Interpretationmentioning

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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Low-Level Saturation of Brillouin Backscattering due to Cavity Formation in High-Intensity Laser-Plasma Interaction

Cited by 48 publications

References 14 publications

Signature of externally introduced laser fields in X-ray emission of multicharged ions

Signature of externally introduced laser fields in X-ray emission of multicharged ions

Effects of ion-ion collisions and inhomogeneity in two-dimensional kinetic ion simulations of stimulated Brillouin backscattering

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

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