Observation of the Parametric Two-Ion Decay Instability with Thomson Scattering

Niemann, C.; Glenzer, S. H.; Knight, J.; Divol, L.; Williams, E. A.; Gregori, G.; Cohen, B. I.; Constantin, Carmen; Froula, D. H.; Montgomery, D. S.; Johnson, R. P.

doi:10.1103/physrevlett.93.045004

Cited by 49 publications

(18 citation statements)

References 13 publications

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“…These simulations results and those reported in Refs. 1 and 2 support recent experimental observations of the importance of ion trapping effects 19,20 and the two-ion-wave decay 21,22 associated with SBS.…”

Section: Introductionsupporting

confidence: 74%

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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Section: Introductionsupporting

confidence: 74%

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

et al. 2006

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“…Future interaction studies with probe beams at both 2ω and 3ω will use this new target platfrom to determine the limitations on electron temperature, density, and intensity for efficient beam propagation [21]. Further studies with this target platform are directed to differentiate between hydrodynamic models and the importance of magnetic fields through measurements of the spatial temperature gradients parallel and perpendicular to the hohlraum axis using imaging Thomson scattering techniques [22].…”

Section: Discussionmentioning

confidence: 99%

Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies

et al. 2006

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Accurate measurements of the plasma conditions in laser-produced high-temperature plasmas have been achieved using the recently activated 4ω Thomson-scattering diagnostic at the Omega Laser Facility. These diagnostic measurements were performed in a new hohlraum target platform that will be used to study laser-plasma interaction in a strongly damped regime comparable to those occurring in indirect drive inertial confinement fusion plasmas. The Thomson-scattering spectra show the collective ion-acoustic features that fit the theory for two ion species plasmas allowing us to accurately and independently determine both the electron and ion temperatures.The electron temperature was found to range from 2 keV to 4 keV as the total heater beam energy deposited into the hohlraum was increased from 8 kJ to 17 kJ. The results are compared to 2D hydrodynamic simulations using flux limited diffusion and nonlocal heat flux models. The target platform presented provides a novel test bed to investigate laser-plasma interaction physics in the strongly damped backscatter regime.

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“…2 The perturbation of the hydrodynamic flow caused by SBS momentum deposition can also be regarded as a special case of harmonic generation. 7,8 Particle trapping, and the socalled wave breaking, can play a significant role in determining the saturation level of the ion-acoustic fluctuations. 5 The so-called subharmonic decay-or two ion decay-by which the SBS driven IAW gives rise to longer-wavelength ion-acoustic waves, could also be an important saturation mechanism, because it transfers the SBS driven IAW energy into a spectral domain where the IAW cannot interact with the transverse waves, thus playing the role of an effective IAW damping.…”

Section: Introductionmentioning

confidence: 99%

Parametric instability of a driven ion-acoustic wave

2005

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Articles you may be interested inStability analysis for two-dimensional ion-acoustic waves in quantum plasmas Phys. Plasmas 21, 052107 (2014); 10.1063/1.4875987 Planar and non-planar dust ion-acoustic solitary waves in a quantum dusty electronegative plasma Phys. Plasmas 19, 033706 (2012); 10.1063/1.3688901 The parametric decay of dust ion acoustic waves in non-uniform quantum dusty magnetoplasmas Phys. Plasmas 18, 063705 (2011); 10.1063/1.3595235 Linear and nonlinear ion-acoustic waves in very dense magnetized plasmas Phys. Plasmas 15, 082303 (2008); 10.1063/1.2965496 Linear and nonlinear ion-acoustic waves in an unmagnetized electron-positron-ion quantum plasmaThe stability of a driven coherent ion-acoustic wave ͑IAW͒ with regard to its decay into longer wavelengths is investigated. The effects of harmonic generation and wave dispersion are taken into account. The driver frequency and wave number do not necessarily satisfy the linear ion-acoustic wave dispersion relation, allowing a frequency mismatch between the driver frequency and the plasma linear-response frequency. The stability analysis is generally shown to involve a seven wave coupling in which the fundamental and the second-harmonic components of the equilibrium IAW couple to a low-frequency daughter wave and to their Stokes and anti-Stokes satellites. The general dispersion relation corresponding to this seven wave coupling is derived and solved numerically in three-dimensional geometry. A variety of branches of instabilities is found to appear. In order to classify these branches, an approximate dispersion relation is derived, corresponding to the Korteweg-de-Vries limit for the plasma low-frequency nonlinear behavior. This approximate dispersion relation makes it possible to obtain approximate expressions for the growth rate of each branch. The occurrence of each type of instability is discussed as a function of the sign and size of the frequency mismatch. The special case of one-dimensional geometry is also considered, making it possible to investigate the results of one-dimensional numerical simulations.

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Observation of the Parametric Two-Ion Decay Instability with Thomson Scattering

Cited by 49 publications

References 13 publications

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

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

Thomson-scattering measurements of high electron temperature hohlraum plasmas for laser-plasma interaction studies

Parametric instability of a driven ion-acoustic wave

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