Physics of laser-plasma interaction for shock ignition of fusion reactions

Tikhonchuk, V. T.; Colaïtis, A.; Vallet, A.; Aisa, E. Llor; Duchateau, Guillaume; Nicolaï, Ph.; Ribeyre, X.

doi:10.1088/0741-3335/58/1/014018

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…Each of the processes involved in the compression of an ICF shell or in the shock modification by HEs fluxes can be studied separately 3,12,19,22,23 . However, the analysis of mutual effects requires an integrated tool designed for hydrodynamic scales.…”

Section: Introductionmentioning

confidence: 99%

Influence of laser induced hot electrons on the threshold for shock ignition of fusion reactions

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Influence of laser induced hot electrons on the threshold for shock ignition of fusion reactions

et al. 2016

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“…( 13)) and ponderomotive effects depend on the relative critical intensity, it is appropriate to normalize intensity to the corresponding critical intensity, that is, u = I s /I 0c for HARMONY and u = I s /I 3b 0c for PCGO. iv) According to latter point, HARMONY results cover the range of u = [2,5]. Given a larger speckle statistics, one PCGO realization cannot reproduce all the results.…”

Section: Comparison To Pcgo Random Methods and Electromagnetic Simula...mentioning

confidence: 86%

“…This is the case of I /I 0c = 2.5, which covers the interval u = I s /I 3b 0c = [0.1, 5]. Figure 10 shows the logarithm of the speckle abundance as a function of the intensity range u = [2,5] for three cases: HARMONY I /I 0c = 0.5 (blue line), PCGO semi-determinsitic method (dotted red line) and random method (dashed black line) with I /I 0c = 2.5. Compared to the HARMONY results, the random algorithm (dashed black line) allows to recover the lowintensity speckle abundance but fails to follow the HAR-MONY trend in the high tail due to a low intensity cut-off.…”

Section: Comparison To Pcgo Random Methods and Electromagnetic Simula...mentioning

confidence: 99%

Self-focusing of a spatially modulated beam within the paraxial complex geometrical optics framework in low-density plasmas

Ruocco¹,

Duchateau²,

Tikhonchuk³

2021

Plasma Phys. Control. Fusion

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Accurate modelling of ponderomotive laser self-focusing may represent a key for the success of inertial confinement fusion, especially within the shock ignition approach. From a numerical point of view, implementation of a paraxial complex geometrical optics (PCGO) method has improved the performance of the hydrodynamics code CHIC, but (1) overestimating ponderomotive speckle self-focusing in reduced two-dimensional geometry, and (2) not accounting for speckle intensity statistics. The first issue was addressed in our previous work (Ruocco et al 2019 Plasma Phys. Control. Fusion 61 115009). Based on those results, here we propose a novel PCGO scheme for modelling spatially modulated laser beams by (1) creating Gaussian speckles, and (2) emulating the realistic speckle intensity statistics. Self-focusing of spatially modulated beams in a homogeneous stationary plasma with this method is studied. This investigation evidences that plasma smoothing does not reduce the speckle intensity enhancement at long time scales when the average beam intensity is twice above the speckle critical intensity. Comparison against electromagnetic simulations confirms that this approach improves the description of self-focusing of high-intensity speckles within the PCGO model.

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“…In order to improve the conventional laser fusion performance, [1,2] shock ignition (SI) [3] has been proposed in the base of driving spherically converging shock wave. [4][5][6] In addition to exploring the underlying physics of SI, [6][7][8] preliminary experiments have been also tested by Theobald et al [9] and Radha et al [10] and in OMEGA facility. [11] Furthermore, recent experiments have been performed on the SI approach that demonstrates the possibility of achieving high energy gain.…”

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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Physics of laser-plasma interaction for shock ignition of fusion reactions

Cited by 9 publications

References 32 publications

Influence of laser induced hot electrons on the threshold for shock ignition of fusion reactions

Influence of laser induced hot electrons on the threshold for shock ignition of fusion reactions

Self-focusing of a spatially modulated beam within the paraxial complex geometrical optics framework in low-density plasmas

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

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