Laser program development at CEL-V: overview of recent experimental results

Buresi, E.; Coutant, J.; Dautray, Robert; Decroisette, M.; Duborgel, B.; Guillaneux, P.; Launspach, J.; Nelson, Peter G.; Patou, C.; Reisse, Jacques; Watteau, J.P.

doi:10.1017/s0263034600002214

Cited by 59 publications

(33 citation statements)

References 15 publications

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“…CH ablator thickness and drive power are initially given by Rocket-effect formulae [2] for an implosion velocity of 310 km/s and assuming full ablation of CH. Calculations are then performed using the one-dimensional (1D) Lagrangian radiation-hydrodynamics code FCI1 [10]. Laser pulse shapes are initially defined to achieve implosion velocities around 310 km/s for each design and Table 1. follow a Kidder-like law [11] to minimize entropy during the whole compression phase.…”

Section: Direct-drive Baseline Designsmentioning

confidence: 99%

Systematic analysis of direct-drive baseline designs for shock ignition with the Laser MégaJoule

Brandon

Canaud

Laffite

et al. 2013

EPJ Web of Conferences

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Abstract. We present direct-drive target design studies for the laser mégajoule using two distinct initial aspect ratios (A = 34 and A = 5). Laser pulse shapes are optimized by a random walk method and drive power variations are used to cover a wide variety of implosion velocities between 260 km/s and 365 km/s. For selected implosion velocities and for each initial aspect ratio, scaled-target families are built in order to find self-ignition threshold. High-gain shock ignition is also investigated in the context of Laser MégaJoule for marginally igniting targets below their own self-ignition threshold.

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Section: Direct-drive Baseline Designsmentioning

confidence: 99%

Systematic analysis of direct-drive baseline designs for shock ignition with the Laser MégaJoule

Brandon

Canaud

Laffite

et al. 2013

EPJ Web of Conferences

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“…We then consider shock ignition of each target done by adding a timed laser spike. Calculations are done with the multi-dimensional Lagrangian radiation-hydrodynamics code FCI2 [18] in 1D.…”

Section: D-analysis Of Direct-drive Shock Ignition For Lmjmentioning

confidence: 99%

Direct-drive shock-ignition for the Laser MégaJoule

Canaud

Brandon

Laffite

et al. 2013

EPJ Web of Conferences

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Abstract. We present a review of direct-drive shock ignition studies done as an alternative for the Laser MégaJoule (LMJ). One and two dimensional systematic analyses of HiPER-like shock-ignited target designs are performed for the fuel assembly irradiation uniformity using the whole LMJ configuration or a part of the facility, and for the uniformity of the ignitor spike. High-gain shock-ignition is shown to be possible with intensity of each quad less than 10 15 W/cm 2 but low modes asymmetries displace the power required in the ignitor spike towards higher powers. Shock-ignition of Direct-Drive Double-Shell non-cryogenic targets is also addressed.

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“…The time-dependant multi-keV powers measured by DMX and calculated with the two-dimensional radiative code FCI2 [10] are given in Figure 1. The waveforms are plotted in arbitrary units and show a reasonably good qualitative agreement between measurements and simulation results.…”

Section: Multi-kev Waveforms and Emission Zonesmentioning

confidence: 99%

Multi-keV x-ray sources from metal-lined cylindrical hohlraums

et al. 2012

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Abstract. In 2009 a series of metal-lined hohlraums were tested on the Omega laser facility. The main aims of the campaign were to improve our understanding of the multi-keV energy production and our capability to numerically reproduce the measured conversion efficiencies (CE's). Two studies have been primarily planned: the effect of the metallic plasma mean ionization states and that of hydrodynamics. Six targets were experimented for which the metallic materials (titanium, copper, germanium), the cavity diameter, and the irradiation energy were varied. Here we compare experimental and calculated results. The numerical simulations are performed with the 2D hydro-radiative code FCI2. For all the cavities, the measured multikeV x-ray powers versus time are qualitatively well reproduced by the simulations, indicating that hohlraum hydrodynamics seems to be well calculated. But we have an underestimation by a factor of ∼2 for the calculated CEs versus experimental values for titanium and copper hohlraums. By contrast there is a good agreement between measurements and calculations for the germanium hohlraum. To explain these results, we have calculated off-line integrated emissivities for couples of ( , Te) values contributing to the multi-keV production with several non-local-thermal-equilibrium (NLTE) atomic physics models.

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Laser program development at CEL-V: overview of recent experimental results

Cited by 59 publications

References 15 publications

Systematic analysis of direct-drive baseline designs for shock ignition with the Laser MégaJoule

Systematic analysis of direct-drive baseline designs for shock ignition with the Laser MégaJoule

Direct-drive shock-ignition for the Laser MégaJoule

Multi-keV x-ray sources from metal-lined cylindrical hohlraums

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