Thresholds and spectra of SBS in plasmas with two species of ions

Kuzora, I. V.; Kozlov, Maxim; McKinstrie, C. J.; Ovchinnikov, K. N.; Silin, V. P.; Uryupin, S. A.; Vagin, K. Yu.

doi:10.1016/s0375-9601(01)00297-3

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…In indirect drive fusion, one employs longer pulses, hence it is important to devise techniques to suppress SBS. In a plasma of heavy ions, this could be accomplished by introducing a small fraction of light ion species that could incur heavy Landau damping in the ion acoustic wave, suppressing the SBS [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Stimulated Brillouin scattering at the second harmonic of a laser in two-ion-species plasma

Yadav¹,

Kaur²,

Tripathi³

2008

Phys. Scr.

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A high power laser (ω 0 , k 0 ), propagating through a two-ion-species plasma, produces oscillatory electron velocity at the second harmonic due to V × B force. This velocity parametrically couples an ion acoustic wave (ω, k) and a scattered electromagnetic wave (ω 1 , k 1 ), where ω 1 = ω − 2ω 0 , k 1 = k − 2k 0 causing second harmonic Brillouin scattering. The growth rate, far above the threshold, scales linearly with laser intensity. It has maximum growth rate slightly tilted to side scattering and vanishes for back scattering. The presence of light ion species introduces linear damping on the ion mode, diminishing the growth rate of the parametric instability.

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Section: Introductionmentioning

confidence: 99%

Stimulated Brillouin scattering at the second harmonic of a laser in two-ion-species plasma

Yadav¹,

Kaur²,

Tripathi³

2008

Phys. Scr.

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“…In addition to ordinary plasmas having positive ions and electrons, there has been a significant interest in two ion species plasmas, as they resemble hohlraum plasmas encountered in indirect drive fusion [10][11][12][13][14][15]. Kirkwood et al [10] have experimentally studied the stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) from a Xe plasma embedded with C 5 H 12 impurities and found that the ion wave damping varies in a well-characterized plasma with the concentration of C 5 H 12 impurity.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that the reflectivity of a laser due to SRS from long scale length hohlraum plasmas depends on the damping of ion-acoustic waves; this dependence was observed particularly in the plasmas with either low or high ionization states. The thresholds of the SBS instability and the nonlinear influence of the driving field on the SBS spectrum have been studied in plasmas with two species of ions [15]. In addition, Satya et al [16] have addressed the problem for a plasma having two ion species and obtained extensive analytical reductions of the low frequency dispersion relation of the field plasma system, including results on the OTSI.…”

Section: Introductionmentioning

confidence: 99%

Effect of negative ions on oscillating two stream instability of a laser driven plasma beat wave in a homogeneous plasma

Kumar¹,

Malik²

2006

Phys. Scr.

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A long wavelength plasma wave is driven by two copropagating lasers with frequencies ωL1 and ωL2 such that ωL1 − ωL2 ≈ ωp. The plasma beat wave (ω0, k0) grows in amplitude and becomes susceptible to oscillating two stream instability, producing a low frequency electrostatic mode (ω,k) and two shorter wavelength Langmuir wave sidebands (ωs,f, ks,f ) with ωs,f = ω ∓ ω0 and ks,f = k ∓ k0 in a plasma having positive ions, negative ions and electrons. It is shown that the growth rate, and the amplitudes and phases of the sidebands are influenced by the density n0n and temperature Tn of the negative ions. The effect of density on the instability is found to be more significant in a plasma that has positive and negative ions of higher temperatures.

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“…The thresholds of the SBS instability and the non-linear influence of the driving field on the SBS spectrum are studied in plasmas with two species of ions [7]. The spectrum of those quasimodes, which define the frequency shift of the scattered radiation in the process of SBS is studied.…”

Section: Introductionmentioning

confidence: 99%

Oscillating Two Stream Instability of a Laser in a Two Ion Species Plasma

et al. 2004

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The oscillating two stream instability (OTSI) of a high amplitude laser or a plasma wave in near-critical density high-Z plasma is influenced by the presence of light ions. A regime of OTSI arises where the low frequency response of electrons and light ions is adiabatic but the heavy ion response is much slower. As a consequence the low frequency mode is not a purely growing mode but has a finite real frequency as well. In the case of a pump, radially localized in a suitable density profile, the growth rate is reduced and the wavelength of the maximally growing mode is enhanced.Ã

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Thresholds and spectra of SBS in plasmas with two species of ions

Cited by 9 publications

References 8 publications

Stimulated Brillouin scattering at the second harmonic of a laser in two-ion-species plasma

Stimulated Brillouin scattering at the second harmonic of a laser in two-ion-species plasma

Effect of negative ions on oscillating two stream instability of a laser driven plasma beat wave in a homogeneous plasma

Oscillating Two Stream Instability of a Laser in a Two Ion Species Plasma

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