Coupling between electron plasma waves in laser–plasma interactions

Everett, Matthew J.; Lal, Amit K.; Clayton, C. E.; Mori, W. B.; Joshi, C.; Johnston, T. W.

doi:10.1063/1.871678

Cited by 8 publications

(9 citation statements)

References 10 publications

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“…Summarizing these results, we conclude that the presence of the satellite enhances the growth of RFS in the simulation, and thus the growth of the (RFS-driven) plasma wave. The RFS enhancement also leads to RBS suppression, in agreement with results by Everett et al [28,29], thus preventing heavy beam loading of the laser wake and leading to an even larger wake amplitude. Both effects ultimately lead to an increase in the yield of high-energy electrons, rendering the Stokes satellite a very effective, experimentally feasible way to stimulate fast-electron production.…”

Section: Effect Of Rfssupporting

confidence: 90%

“…This method has specifically been employed to isolate the effect of RBS on high-energy electron production. The second is RFS seeding of the pulse, which has been inspired by the notion that stimulation of RFS growth leads to a decrease in RBS through the mode coupling between the RBS and RFS Langmuir waves [28,29]. In addition, such stimulation will lead to a larger amplitude laser wake that will be less influenced by RBS-induced beam loading.…”

Section: Effect Of Raman Scattering On Electron Yieldmentioning

confidence: 99%

“…Everett et al [28,29] have presented numerical and experimental results on how a fast phase velocity plasma wave can suppress a slow plasma wave, as well as a theoretical explanation in which the amplitudes of the waves are assumed to be slowly varying compared with the plasma period. In the linear regime, the amplitude δn s /n 0 of the normalized density perturbation of the slow (e.g.…”

Section: Effect Of Raman Scattering On Electron Yieldmentioning

confidence: 99%

“…We have also performed benchmarks to reproduce results on RFS stimulation in beat-wave experiments [24], RFS stimulation through direct RFS seeding [30], and suppression of RBS by RFS in beat-wave experiments [28,29], all obtained in the linear regime. Simulations have been performed with a 0 = 0.2 for the RFS seeding case and a 0 = 0.1 for both pulses in the beat-wave case.…”

Section: Simulation Setupmentioning

confidence: 99%

See 3 more Smart Citations

On the effect of laser and plasma parameters on stimulated Raman scattering and fast-electron generation

Trines¹,

Kamp²,

Schep³

et al. 2005

J. Plasma Phys.

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The effect of Raman instabilities on the production of fast electrons in laser-plasma interaction has been investigated for laser intensities well above the electron trapping threshold. The results of one-dimensional particle-in-cell simulations show that in this regime the presence of Raman backscattering (RBS) hampers fast-electron production, and that its suppression increases the yield of high-energy electrons (>15 MeV). Such suppression has been realized either through deletion of all backscattered radiation from the simulations or through direct stimulation of Raman forward scattering (RFS). An increased high-energy electron yield has been observed for both methods. In addition, the influence of various laser and plasma parameters on the production of highly energetic electrons has been investigated. Specifically, the effects of plasma density ramps, skews in the temporal envelopes of the laser pulses, and laser frequency chirp (both pulse-length preserving and bandwidth preserving) have been examined. For each parameter, its influence on the yield of high-energy electrons can be explained from the way it affects the balance between RBS and RFS excitation in laser-plasma interaction.

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Section: Effect Of Rfssupporting

confidence: 90%

Section: Effect Of Raman Scattering On Electron Yieldmentioning

confidence: 99%

Section: Effect Of Raman Scattering On Electron Yieldmentioning

confidence: 99%

Section: Simulation Setupmentioning

confidence: 99%

See 2 more Smart Citations

On the effect of laser and plasma parameters on stimulated Raman scattering and fast-electron generation

Trines¹,

Kamp²,

Schep³

et al. 2005

J. Plasma Phys.

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“…This method has specifically been employed to isolate the effect of RBS on high-energy electron production. The second is RFS seeding of the pulse, which has been inspired by the notion that stimulation of RFS growth leads to a decrease in RBS through mode coupling between the RBS and RFS Langmuir waves [16,17]. In addition, such stimulation will lead to a larger-amplitude laser wake that will be less influenced by RBS-induced beam loading.…”

mentioning

confidence: 99%

Enhancement of high-energy electron generation through suppression of Raman backscattering

et al. 2004

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The effect of Raman backscattering (RBS) on high-energy electron generation in laser-plasma interaction has been investigated for laser intensities well above the wave breaking and electron trapping threshold. One-dimensional particle-in-cell simulations show that suppression of RBS increases the high-energy electron yield in this regime. RBS-induced heating causes heavy beam loading and damping of the laser wake. Its suppression leads to higher wake amplitudes and higher particle energies. RBS suppression through direct stimulation of Raman forward scatter is demonstrated. The implications for high-energy electron production through laser-plasma interaction are discussed.Introduction. -Several recent experiments (see [1,2] and references therein) on the interaction of intense laser pulses with underdense plasmas have demonstrated the production of energetic electrons in the self-modulated regime of the laser wakefield accelerator (LWFA) with accelerating gradients in excess of 100 GV/m. The resulting electron bunches are characterized by high charge (up to 10 nC), sub-ps duration, and an exponential energy distribution which extends out to hundreds of MeV. Applications of these bunches include injectors to secondary accelerators [3], short-pulse radiation sources [4], short-lived radio-isotope production [5], and fast-ignition fusion [6].Raman forward (RFS) and backward (RBS) scattering are laser-plasma instabilities that govern the self-trapping and acceleration dynamics in the self-modulated LWFA. According to basic Raman scattering theory [7], RBS is a three-wave interaction, in which the incoming laser light (carrier frequency ω 0 , wave number k 0 , peak amplitude E 0 = (m e ω 0 c/e)a 0 ) decays into a backscattered electromagnetic (EM) wave (ω 0 − ω p , −(k 0 − k p )) and a slow Langmuir wave (ω p , 2k 0 − k p ). Here, ω p = n 0 e 2 /(ε 0 m e ), k p = ω p /c, and n 0 is the unperturbed plasma electron density. The Langmuir wave phase velocity is approximately ω p c/(2ω 0 ) c for an

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Toward more robust ignition of inertial fusion targets

et al. 2023

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Following the 3.15 MJ fusion milestone at the National Ignition Facility, the further development of inertial confinement fusion, both as a source for future electricity generation and for high-energy-density physics applications, requires the development of more robust ignition concepts at current laser facility energy scales. This can potentially be achieved by auxiliary heating the hotspot of low convergence wetted foam implosions where hydrodynamic and parametric instabilities are minimized. This paper presents the first multi-dimensional Vlasov–Maxwell and particle-in-cell simulations to model this collisionless interaction, only recently made possible by access to the largest modern supercomputers. The key parameter of interest is the maximum fraction of energy that can be extracted from the electron beams into the hotspot plasma. The simulations indicate that significant coupling efficiencies are achieved over a wide range of beam parameters and spatial configurations. The implications for experimental tests on the National Ignition Facility are discussed.

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Coupling between electron plasma waves in laser–plasma interactions

Cited by 8 publications

References 10 publications

On the effect of laser and plasma parameters on stimulated Raman scattering and fast-electron generation

On the effect of laser and plasma parameters on stimulated Raman scattering and fast-electron generation

Enhancement of high-energy electron generation through suppression of Raman backscattering

Toward more robust ignition of inertial fusion targets

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