Breaking and Turbulent Transition in Ion Acoustic Waves

Judice, Charles N.; Decker, J.; Stern, R. A.

doi:10.1103/physrevlett.30.267

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The PIC simulations corresponding to these experiments suggest that strong SBS can grow in the n e < 0.05 n c region and suppress SRS and TPD in the higher density region [34] The inward movement of the pump-depletion front can be explained by the IAW-breaking in SBS. An IAW would break when the ion quiver velocity (v quiver ) is close to the wave's phase velocity (c s ), as v quiver ≈ c s [35,36]. There are two IAW modes in a CH plasma: a fast mode and a slow mode.…”

mentioning

confidence: 99%

Pump-Depletion Dynamics and Saturation of Stimulated Brillouin Scattering in Shock Ignition Relevant Experiments

Zhang,

Li,

Krauland

et al. 2019

Preprint

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As an alternative inertial confinement fusion scheme with predicted high energy gain and more robust designs, shock ignition requires a strong converging shock driven by a shaped pulse with a high-intensity spike at the end to ignite a pre-compressed fusion capsule. Understanding nonlinear laser-plasma instabilities in shock ignition conditions is crucial to assess and improve the laser-shock energy coupling. Recent experiments conducted on the OMEGA-EP laser facility have for the first time demonstrated that such instabilities can ∼100% deplete the first 0.5 ns of the high-intensity laser pump. Analysis of the observed laser-generated blast wave suggests that this pump-depletion starts at 0.01-0.02 critical density and progresses to 0.1-0.2 critical density. This pump-depletion is also confirmed by the time-resolved stimulated Raman backscattering spectra. The dynamics of the pump-depletion can be explained by the breaking of ion-acoustic waves in stimulated Brillouin scattering. Such strong pump-depletion would inhibit the collisional laser energy absorption but may benefit the generation of hot electrons with moderate temperatures for electron shock ignition [Shang et al.

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mentioning

confidence: 99%

Pump-Depletion Dynamics and Saturation of Stimulated Brillouin Scattering in Shock Ignition Relevant Experiments

Zhang,

Li,

Krauland

et al. 2019

Preprint

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“…We have shown that the IAW can be formed at the time w » ), the amplitude of the IAW will be amplified enormously and the nonlinear effect becomes dominant. The nonlinear effect makes the phase velocity at the peak of the IAW greater than that at the trough of the IAW (Judice et al 1973;Forslund et al 1979;Rosenau 1988). Consequently, the IAW becomes steeper gradually, and an IASW is excited finally as shown in Figure 4(b) (Popel et al 1995;Shah & Saeed 2009;Kakad et al 2013;Lotekar et al 2017).…”

Section: Ion Acoustic Shock Wave Formation and Ion Accelerationmentioning

confidence: 98%

Ion Acoustic Shock Wave Formation and Ion Acceleration in the Interactions of Pair Jets with Electron–ion Plasmas

Huang

Weng

Wang

et al. 2022

ApJ

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Astrophysical jets are ubiquitous in the universe and often associated with compact objects, and their interactions with the ambient medium not only dissipate their own energy but also provide ideal circumstances for particle acceleration. By means of theoretical analysis and particle-in-cell simulations, here we study the ion acoustic shock wave (IASW) formation and consequent ion acceleration when electron–positron (e − e +) jets are injected into ambient electron–ion plasmas. It is found that the Buneman instability can be excited first, which induces the formation of an ion acoustic wave (IAW). As the amplitude of the IAW increases, its waveform is steepened and subsequently an IASW is formed. Some ions in the ambient plasmas will be reflected when they encounter the IASW, and thus can be accelerated to form an energetic ion beam. For an initial e − e + jet with the Lorentz factor γ 0 = 100 and the ion–electron mass ratio m i /m e = 1836, the ions can be accelerated up to 580 MeV. This study deepens our understanding of the fireball model of gamma-ray bursts, the shock model of pulsar wind nebulae, the origin of cosmic rays, and other related astrophysical processes.

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Section: Cp XX = 4ire[n 0 Exv(ecp/k B T E ) -J" M F(xut)du] (7b)mentioning

confidence: 99%

“…14 Such behavior is beyond the scope of the KdV equation and will be reported elsewhere. 15 We acknowledge useful discussions with J. F. Decker, G. Schmidt, and R. A. Stern regarding ion acoustic waves, and with R. H. Hardin and R. J. Mason regarding computational methods.We could equally well have considered the experi-mentally more easily realizable boundary-value problem, v(0,t) =e(oo 0 /k 0 ) cos o) 0 f . For weak nonlinearity and dispersion, they are equivalent.…”

mentioning

confidence: 99%

Recurrence of Nonlinear Ion Acoustic Waves

Tappert¹,

Judice²

1972

Phys. Rev. Lett.

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TIHE ~FIG. 4 # Magnetic moment, and particle motion along mirror field when electric field is resonant, flute, and moderate amplitude, e

-IQ 9 the system is essentially linear. For such an implied change in phase-space topology the particle is almost always forced to cross singular surfaces during one mirror transit and thereby scatter appreciably in a number of transit times. Figure 4 illustrates this well as the field configuration and initial particle phases are identical to those of Fig. 3, except that in Fig. 4 the potential

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Breaking and Turbulent Transition in Ion Acoustic Waves

Cited by 9 publications

References 16 publications

Pump-Depletion Dynamics and Saturation of Stimulated Brillouin Scattering in Shock Ignition Relevant Experiments

Pump-Depletion Dynamics and Saturation of Stimulated Brillouin Scattering in Shock Ignition Relevant Experiments

Ion Acoustic Shock Wave Formation and Ion Acceleration in the Interactions of Pair Jets with Electron–ion Plasmas

Recurrence of Nonlinear Ion Acoustic Waves

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