Measurements of parametric instabilities at laser intensities relevant to strong shock generation

Cristoforetti, G.; Antonelli, L.; Atzeni, S.; Baffigi, F.; Barbato, F.; Batani, D.; Boutoux, G.; Colaïtis, A.; Dostál, J.; Dudžák, R.; Juha, L.; Koester, P.; Marocchino, A.; Mancelli, D.; Nicolaï, Ph.; Renner, O.; Santos, J. J.; Schiavi, A.; Škorić, Miloš M.; Šmíd, Michal; Straka, P.; Gizzi, L. A.

doi:10.1063/1.5006021

Cited by 27 publications

(29 citation statements)

References 80 publications

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“…In this way, Landau damping limits the BRS growth to higher densities when plasma temperature is large. This feature agrees with the shift of the BRS peak region from 0.12 to 0.18 , obtained by comparing the results in shots at irradiation [30] , where maximum plasma temperature was 2–2.5 keV, with the ones obtained in the present work.…”

Section: Reflectivity Backward- and Side-stimulated Raman Scatteringsupporting

confidence: 93%

“…As already discussed in Ref. [30], this is made possible by the increase of the density scalelength of the plasma at late times, which compensates the fall of laser intensity.…”

Section: Timing Of Tpd and Srs Instabilitiesmentioning

confidence: 87%

“…The laser energy of enabled irradiation of a plasma with scalelength , at a maximum laser intensity of . Experimental data yielded a detailed description of the extent and timing of parametric instabilities [29, 30] , in particular of SRS, and enabled us to establish a correlation with the measured HE energy distribution.…”

Section: Introductionmentioning

confidence: 99%

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Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Cristoforetti¹,

Antonelli

Mancelli

et al. 2019

High Pow Laser Sci Eng

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Laser–plasma interaction (LPI) at intensities $10^{15}{-}10^{16}~\text{W}\cdot \text{cm}^{-2}$ is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes of high-energy nonthermal electrons. Such a regime is of paramount importance for inertial confinement fusion (ICF) and in particular for the shock ignition scheme. In this paper we report on an experiment carried out at the Prague Asterix Laser System (PALS) facility to investigate the extent and time history of stimulated Raman scattering (SRS) and two-plasmon decay (TPD) instabilities, driven by the interaction of an infrared laser pulse at an intensity ${\sim}1.2\times 10^{16}~\text{W}\cdot \text{cm}^{-2}$ with a ${\sim}100~\unicode[STIX]{x03BC}\text{m}$ scalelength plasma produced from irradiation of a flat plastic target. The laser pulse duration (300 ps) and the high value of plasma temperature ( ${\sim}4~\text{keV}$ ) expected from hydrodynamic simulations make these results interesting for a deeper understanding of LPI in shock ignition conditions. Experimental results show that absolute TPD/SRS, driven at a quarter of the critical density, and convective SRS, driven at lower plasma densities, are well separated in time, with absolute instabilities driven at early times of interaction and convective backward SRS emerging at the laser peak and persisting all over the tail of the pulse. Side-scattering SRS, driven at low plasma densities, is also clearly observed. Experimental results are compared to fully kinetic large-scale, two-dimensional simulations. Particle-in-cell results, beyond reproducing the framework delineated by the experimental measurements, reveal the importance of filamentation instability in ruling the onset of SRS and stimulated Brillouin scattering instabilities and confirm the crucial role of collisionless absorption in the LPI energy balance.

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Section: Reflectivity Backward- and Side-stimulated Raman Scatteringsupporting

confidence: 93%

“…As already discussed in Ref. [30], this is made possible by the increase of the density scalelength of the plasma at late times, which compensates the fall of laser intensity.…”

Section: Timing Of Tpd and Srs Instabilitiesmentioning

confidence: 87%

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Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Cristoforetti¹,

Antonelli

Mancelli

et al. 2019

High Pow Laser Sci Eng

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“…In the shock ignition scheme 12 the fuel is ignited from a central hot spot heated by a strong spherically convergent shock. The laser intensities required to launch this shock exceed the threshold of parametric instabilities (such as stimulated Raman scattering (SRS) or two–plasmon decay), which couple a significant fraction of the laser energy to hot electrons 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of suprathermal electrons inside a laser accelerated plasma via highly-resolved K⍺-emission

et al. 2019

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Suprathermal electrons are routinely generated in high-intensity laser produced plasmas via instabilities driven by non-linear laser-plasma interaction. Their accurate characterization is crucial for the performance of inertial confinement fusion as well as for performing experiments in laboratory astrophysics and in general high-energy-density physics. Here, we present studies of non-thermal atomic states excited by suprathermal electrons in kJ-ns-laser produced plasmas. Highly spatially and spectrally resolved X-ray emission from the laser-deflected part of the warm dense Cu foil visualized the hot electrons. A multi-scale two-dimensional hydrodynamic simulation including non-linear laser-plasma interactions and hot electron propagation has provided an input for ab initio non-thermal atomic simulations. The analysis revealed a significant delay between the maximum of laser pulse and presence of suprathermal electrons. Agreement between spectroscopic signatures and simulations demonstrates that combination of advanced high-resolution X-ray spectroscopy and non-thermal atomic physics offers a promising method to characterize suprathermal electrons inside the solid density matter.

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“…In order to produce such a strong shock, the laser intensity must reach values of 10 15 − 10 16 W/cm 2 . It is wellknown 2 , that in this interaction regime parametric instabilities such as Stimulated Raman Scattering (SRS) [3][4][5][6] , Two Plasmon Decay (TPD) 5, 7 and Stimulated Brillouin Scattering (SBS) 8,9 are driven in the long scalelength plasma generated during the compression phase.…”

Section: Introductionmentioning

confidence: 99%

Bremsstrahlung cannon design for shock ignition relevant regime

Koester

Baffigi

Cristoforetti

et al. 2021

Review of Scientific Instruments

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We report on the optimization of a BremsStrahlung Cannon (BSC) design for the investigation of laser-driven fast electron populations in a shock ignition relevant experimental campaign at the Laser Megajoule-PETawatt Aquitaine Laser facility. In this regime with laser intensities of 1015 W/cm2–1016 W/cm2, fast electrons with energies ≤100 keV are expected to be generated through Stimulated Raman Scattering (SRS) and Two Plasmon Decay (TPD) instabilities. The main purpose of the BSC in our experiment is to identify the contribution to x-ray emission from bremsstrahlung of fast electrons originating from SRS and TPD, with expected temperatures of 40 keV and 95 keV, respectively. Data analysis and reconstruction of the distributions of x-ray photons incident on the BSC are described.

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Measurements of parametric instabilities at laser intensities relevant to strong shock generation

Cited by 27 publications

References 80 publications

Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

Characterization of suprathermal electrons inside a laser accelerated plasma via highly-resolved K⍺-emission

Bremsstrahlung cannon design for shock ignition relevant regime

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