Experimental investigation of the collective stimulated Brillouin and Raman scattering of multiple laser beams in inertial confinement fusion experiments

Depierreux, S.; Neuville, C.; Tassin, V.; Monteil, M. C.; Masson-Laborde, P. E.; Baccou, C.; Fremerye, P.; Philippe, F.; Seytor, P.; Teychenné, D.; Katz, J.; Bahr, R.; Casanova, M.; Борисенко, Н. Г.; Борисенко, Л. А.; Orekhov, A. S.; Colaïtis, A.; Debayle, A.; Duchateau, Guillaume; Héron, A.; Hüller, S.; Loiseau, P.; Nicolaï, Ph.; Riconda, C.; Tran, G.; Stoeckl, C.; Seka, W.; Tikhonchuk, V. T.; Pesme, D.; Labaune, C.

doi:10.1088/1361-6587/ab5acd

Cited by 12 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then, using Eqs. (12)(13), for the steady-state convective solution, Eqs. (8-10) can be simplified as…”

Section: B Convective Amplification Of the Sp Modesmentioning

confidence: 99%

“…Apart from CBET, the collective stimulated Brillouin scattering (SBS) and the collective stimulated Raman scattering (SRS) of multiple beams with shared daughter waves can also be important, since the temporal growth rate and convective gain are expected to depend on the combined laser intensities. Experimentally, it is observed that the energy amplification factor increases with the number of pump beams and significant scattered light losses are produced in novel backward directions due to the collective coupling [8][9][10][11][12]. Thus the laser-target coupling is significantly impaired.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Collective stimulated Brillouin scattering modes of two crossing laser beams with shared ion acoustic wave

Qiu¹,

Liang²,

Cao³

et al. 2021

Preprint

View full text Add to dashboard Cite

The overlapping of multiple beams is common in inertial confinement fusion (ICF), making the collective stimulated Brillouin scattering (SBS) with shared ion acoustic wave (IAW) potentially important because of the effectively larger laser intensities to drive the instability. In this work, based on a linear kinetic model, an exact analytic solution for the convective amplification of SBS with the shared IAW modes stimulated by two overlapped beams is presented. From this solution, effects of the wavelength difference, crossing angle, polarization states, and finite beam overlapping volume of the two laser beams on the shared IAW modes are studied. It is found that a wavelength difference of several nanometers between the laser beams has negligible effects, except for a very small crossing angle about one degree. However, the crossing angle, beam polarization states, and finite beam overlapping volume can have significant influences on the shared IAW modes.Furthermore, the out-of-plane modes, in which the wavevectors of daughter waves lie in the different planes from the two overlapped beams, is found to be important for certain polarization states and crossing angles of the laser beams with the finite beam overlapping volume. This work is helpful to comprehend and estimate the collective SBS with shared IAW in ICF experiments.

show abstract

“…Then, using Eqs. (12)(13), for the steady-state convective solution, Eqs. (8-10) can be simplified as…”

Section: B Convective Amplification Of the Sp Modesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Collective stimulated Brillouin scattering modes of two crossing laser beams with shared ion acoustic wave

Qiu¹,

Liang²,

Cao³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Despite extensive theoretical investigations in the late 70s [13][14][15], most of the interest has been focused on stimulated Raman back-scattering (SRBS) [5], due to the experimental complexity to measure SRSS and the largest SRS growth rate for the backward geometry. Recently, there has been a renewed interest due to observations of SRSS on several planar experiments [7,8,10,16,17], either from single beam interaction, or by multiple beams [18]. Multi-beam processes happen when the laser beams are sharing a common symmetry axis enabling to drive a shared daughter wave, being either an EPW [19] or a scattered wave [16,17].…”

mentioning

confidence: 99%

“…Recently, there has been a renewed interest due to observations of SRSS on several planar experiments [7,8,10,16,17], either from single beam interaction, or by multiple beams [18]. Multi-beam processes happen when the laser beams are sharing a common symmetry axis enabling to drive a shared daughter wave, being either an EPW [19] or a scattered wave [16,17]. These experimental observations have led to the development of a more complete analytical description of the SRSS, accounting for the convective nature (finite spatial amplification while propagating through the resonant region) of the instability near the turning point, in order to explain the SRSS growth in region below the absolute threshold [20].…”

mentioning

confidence: 99%

“…From these spectra, it appears that the scattering is driven by single beam SRSS, as multi-beam process would drive scattered light either in the bisector plan at ϕ ≈ 45°for a shared scattered electromagnetic wave [16,17], or constrained to density n e ≤ 0.12n c for a shared EPW due to the large angle between two neighbouring beams [19]. This was further confirmed by experimentally measuring a two-orders-of-magnitude decrease of the signal in the polar direction when #7 is switched off, and retrieving the overall emission profile in the raytracing simulations from independent beam contribution.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Stimulated Raman Side-Scattering Energetic Importance in Directly Driven Experiment

Glize¹,

Zhao²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

Due to its particular geometry, stimulated Raman side-scattering (SRSS) drives scattered light emission at non-conventional directions, leading to scarce and complex experimental observations. Experimental campaigns at the SG-II UP facility have measured the scattered light driven by SRSS over a wide range of angles, showing an emission at large polar angles, sensitive to the plasma profile and laser polarization. Furthermore, direct comparison with back-scattering measurement has evidenced SRSS as the dominant Raman scattering process in the compression stage, leading to the scattering loss of about 5% of the total laser energy. The predominance of SRSS was confirmed by 2D particle-in-cell simulations, and its angular spread has been corroborated by ray-tracing simulations. The main implication is that a complete characterization of the SRS instability and an accurate measurement of the energy losses require the collection of the scattered light in a broad range of directions. Otherwise, spatially limited measurement could lead to an underestimation of the energetic importance of stimulated Raman scattering.

show abstract

Requirements for a 4ω Thomson scattering system on megajoule scale laser facilities

Depierreux

Tassin

Neuville

et al. 2020

Review of Scientific Instruments

View full text Add to dashboard Cite

With the arrival of megajoule class laser facilities, the features of laser-produced plasmas are evolving toward unprecedented high electron temperatures reached in the environment of a cm-scale indirect-drive Hohlraum for a few tens of nanoseconds. In this context, the need for in situ experimental characterization of the plasma parameters becomes critical in order to test hydrodynamics simulations in these novel conditions. Taking advantage of the progress achieved in the last 40 years, Thomson scattering has become a classic diagnostic in the characterization of laser produced plasmas. However, the many beam configuration of the megajoule scale experiments makes the measurements increasingly complex because the Thomson scattering signals produced by the 351 nm heaters themselves dominate the plasma emission around 263 nm, a wavelength range typically of interest when a 4ω Thomson probe is used. This paper reviews the requirements for and the potential of a 4ω Thomson scattering system to be operated on such 351 nm megajoule scale facilities in order to characterize the hot (Te > 3 keV) plasmas produced in the indirect-drive irradiation of a Hohlraum. It is found that the configuration of the diagnostic could be optimized in order to enable the detection of the ion acoustic resonances over a large domain of plasma parameters. The results for the electron plasma wave resonances are also given.

show abstract

Experimental investigation of the collective stimulated Brillouin and Raman scattering of multiple laser beams in inertial confinement fusion experiments

Abstract: Plasma Physics and Controlled Fusion

Cited by 12 publications

References 38 publications

Collective stimulated Brillouin scattering modes of two crossing laser beams with shared ion acoustic wave

Collective stimulated Brillouin scattering modes of two crossing laser beams with shared ion acoustic wave

Measurement of Stimulated Raman Side-Scattering Energetic Importance in Directly Driven Experiment

Requirements for a 4ω Thomson scattering system on megajoule scale laser facilities

Contact Info

Product

Resources

About