Shock generation comparison with planar and hemispherical targets in shock ignition relevant experiment

Baton, S. D.; Bel, E. Le; Brygoo, S.; Ribeyre, X.; Rousseaux, C.; Breil, J.; Kœnig, M.; Batani, D.; Raffestin, D.

doi:10.1063/1.4989525

Cited by 10 publications

(9 citation statements)

References 35 publications

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“…SI with megajoule lasers would have the coronal plasma with a scale length L n ∼ 300-500 µm and electron temperature T e > 3 keV. Particle-in-cell (PIC) simulations with SI high intensity and large plasmas have shown >50% SBS reflectivity [14][15][16], which is not seen in small-scale simulations [17][18][19] or in experiments [20][21][22][23][24][25][26][27]. Some experiments have observed a burst of SBS at the beginning of the laser spike [20,22,23,25].…”

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confidence: 99%

“…Particle-in-cell (PIC) simulations with SI high intensity and large plasmas have shown >50% SBS reflectivity [14][15][16], which is not seen in small-scale simulations [17][18][19] or in experiments [20][21][22][23][24][25][26][27]. Some experiments have observed a burst of SBS at the beginning of the laser spike [20,22,23,25]. However, those experiments were limited by either small plasma scale-lengths (L n < 170 µm) or low laser intensity (∼ 10 14 -10 15 W/cm 2 ).…”

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confidence: 99%

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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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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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“…The first option is beneficial for shock ignition, while the second one is deleterious. For the moment, experiments in a planar geometry did not succeed in generating shock with amplitude larger than 120 Mbar because of limited laser energy and large lateral losses [18]. By contrast, a strong shock excitation has been demonstrated on the Omega facility in a spherical geometry [19]: by using tightly focused laser beams without temporal smoothing the authors succeeded in exciting a shock with amplitude exceeding 300 Mbar on the surface of a solid spherical target.…”

Section: Inertial Fusion Energy Research In Europementioning

confidence: 99%

Progress and opportunities for inertial fusion energy in Europe

Tikhonchuk

2020

Phil. Trans. R. Soc. A.

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In this paper, I consider the motivations, recent results and perspectives for the inertial confinement fusion (ICF) studies in Europe. The European approach is based on the direct drive scheme with a preference for the central ignition boosted by a strong shock. Compared to other schemes, shock ignition offers a higher gain needed for the design of a future commercial reactor and relatively simple and technological targets, but implies a more complicated physics of laser–target interaction, energy transport and ignition. European scientists are studying physics issues of shock ignition schemes related to the target design, laser plasma interaction and implosion by the code developments and conducting experiments in collaboration with US and Japanese physicists, providing access to their installations Omega and Gekko XII. The ICF research in Europe can be further developed only if European scientists acquire their own academic laser research facility specifically dedicated to controlled fusion energy and going beyond ignition to the physical, technical, technological and operational problems related to the future fusion power plant. Recent results show significant progress in our understanding and simulation capabilities of the laser plasma interaction and implosion physics and in our understanding of material behaviour under strong mechanical, thermal and radiation loads. In addition, growing awareness of environmental issues has attracted more public attention to this problem and commissioning at ELI Beamlines the first high-energy laser facility with a high repetition rate opens the opportunity for qualitatively innovative experiments. These achievements are building elements for a new international project for inertial fusion energy in Europe. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 1)’.

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“…[11] Furthermore, recent experiments have been performed on the SI approach that demonstrates the possibility of achieving high energy gain. [12,13] Principle and modelling of SI have been widely reviewed by Atzeni et al, [5] Batani et al, [6] and Atzeni. [14] The benefit of SI relies on the low implosion velocity (u imp ≈ 200-300 km/s) [8] in the compression stage, which enhances the energy gain, G, (G ∝ (1∕u 2 imp )), and significantly reduces the growth of hydrodynamic nonlinearities such as Rayleigh-Taylor instability (RTI) [15] in the ablation front.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of shock ignition target in order to stop generated hot electrons within the cold fuel

Pourhosseini

Ghasemizad

Rezaei

et al. 2021

Contributions to Plasma Physics

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Generation of hot electrons (HEs) within ignitor pulse interaction with pre-compressed fuel is an important challenge in the shock ignition approach.Target optimization in order to prevent the destructive effects of HE is the main goal of the present work. In the first stage, the spectrum of electron energy generated during the interaction of ignitor pulse at different widths with the HiPER pre-compressed target has been estimated by applying particle simulation tool. Then, by changing the thickness of the cold fuel in the range of 185-225 μm, the corresponding areal densities are calculated using 1D hydrodynamic simulations. Finally, in order to assess the energy fusion yield, the iso-gain curves are obtained for different ignitor time windows as well as target thicknesses. Simulation results indicate that by decreasing the baseline, target thickness leads to a 17-70% increase in the fuel areal density. Subsequently, it has been demonstrated that by properly adjusting the parameters of ignitor pulse launch time and its width and employing a target with areal density high enough to stop the HEs, energy gain above 140 can be achieved. Optimal areas for shell thickness and ignitor time window are identified.

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Shock generation comparison with planar and hemispherical targets in shock ignition relevant experiment

Cited by 10 publications

References 35 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

Progress and opportunities for inertial fusion energy in Europe

Optimal design of shock ignition target in order to stop generated hot electrons within the cold fuel

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