Progress in understanding the role of hot electrons for the shock ignition approach to inertial confinement fusion

Batani, D.; Antonelli, L.; Barbato, F.; Boutoux, G.; Colaïtis, A.; Feugeas, J.‐L.; Folpini, Giulia; Mancelli, D.; Nicolaï, Ph.; Santos, J. J.; Trela, J.; Tikhonchuk, V. T.; Badziak, J.; Chodukowski, T.; Jakubowska, K.; Kalinowska, Z.; Pisarczyk, T.; Rosiński, M.; Sawicka, Magdalena; Baffigi, F.; Cristoforetti, G.; D’Amato, Francesco; Koester, P.; Gizzi, L. A.; Viciani, Silvia; Atzeni, S.; Schiavi, A.; Škorić, Miloš M.; Gus'kov, Sergei Yu; Honrubia, J. J.; Limpouch, J.; Klimo, O.; Skála, J.; Gu, Y. J.; Krouský, E.; Renner, O.; Šmíd, Michal; Weber, S.; Dudžák, R.; Krůs, M.; Ullschmied, J.

doi:10.1088/1741-4326/aaf0ed

Cited by 29 publications

(14 citation statements)

References 52 publications

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“…The laser beam profile and intensity distribution in the focal spot were characterized with calorimetric measurements of an attenuated beam. The spot profile was fit to a Gaussian function with e radius of , and the energy encircled within the focal spot was carefully measured 38 . The maximum on-axis laser intensity, calculated using the measured laser temporal profile and spatial distribution, was found to be .…”

Section: Methodsmentioning

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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Section: Methodsmentioning

confidence: 99%

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

et al. 2019

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“…To date, only a few experiments on LPI at SI-relevant intensities have been carried out in moderate kilojouleclass laser facilities, as for example at OMEGA [2,3,21] , LULI [22,23] and PALS [24][25][26] . Due to the lower available energy, typical SI interaction conditions were relaxed, typically resulting in colder (∼1-2 keV) or in shorter (L = n e /(dn e /d x) ∼ 100 µm) inhomogeneous plasmas or otherwise in shorter laser pulses.…”

Section: Introductionmentioning

confidence: 99%

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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“…This paper presents results of laser–plasma interaction studies in the domain of high irradiances and at normal incidence of the laser on a planar inhomogeneous expanding plasma. The theoretical and numerical analysis is related to the experiment [8] performed on the PALS laser system in Prague [9] . The laser delivers up to 700 J in a 350 ps pulse at a wavelength of .…”

Section: Introductionmentioning

confidence: 99%

Collective absorption of laser radiation in plasma at sub-relativistic intensities

Klimo

Nicolaï

et al. 2019

High Pow Laser Sci Eng

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Processes of laser energy absorption and electron heating in an expanding plasma in the range of irradiances $I\unicode[STIX]{x1D706}^{2}=10^{15}{-}10^{16}~\text{W}\,\cdot \,\unicode[STIX]{x03BC}\text{m}^{2}/\text{cm}^{2}$ are studied with the aid of kinetic simulations. The results show a strong reflection due to stimulated Brillouin scattering and a significant collisionless absorption related to stimulated Raman scattering near and below the quarter critical density. Also presented are parametric decay instability and resonant excitation of plasma waves near the critical density. All these processes result in the excitation of high-amplitude electron plasma waves and electron acceleration. The spectrum of scattered radiation is significantly modified by secondary parametric processes, which provide information on the spatial localization of nonlinear absorption and hot electron characteristics. The considered domain of laser and plasma parameters is relevant for the shock ignition scheme of inertial confinement fusion.

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Progress in understanding the role of hot electrons for the shock ignition approach to inertial confinement fusion

Cited by 29 publications

References 52 publications

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

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

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

Collective absorption of laser radiation in plasma at sub-relativistic intensities

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