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

Brandon, V.; Canaud, B.; Laffite, S.; Temporal, M.; Ramis, R.

doi:10.1051/epjconf/20135903004

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…-This work addresses kinetic effects, including ion species separation, in the hot spot of a set of various targets, using the ion Fokker-Planck code fpion [16,17]. For the sake of definiteness, our calculations will be described in more detail in the following in the case of a direct-drive target designed [18] for shock [19] or standard ignition [20]. It is a marginally igniting spherical capsule of cryogenic deuterium (D) and tritium (T) mixture enclosed in a CH ablator with a low aspect (radius to thickness) ratio, which is to be contrasted with the target studied in [16].…”

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confidence: 99%

Species separation and modification of neutron diagnostics in inertial-confinement fusion

Inglebert

Canaud

Larroche

2014

EPL

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The different behaviours of deuterium (D) and tritium (T) in the hot spot of marginally igniting cryogenic DT inertial-confinement fusion (ICF) targets are investigated with an ion Fokker-Planck model. With respect to an equivalent single-species model, a higher density and a higher temperature are found for T in the stagnation phase of the target implosion. In addition, the stagnating hot spot is found to be less dense but hotter than in the single-species case. As a result, the fusion reaction yield in the hot spot is significantly increased. Fusion neutron diagnostics of the implosion find a larger ion temperature as deduced from DT reactions than from DD reactions, in good agreement with NIF experimental results. ICF target designs should thus definitely take ion-kinetic effects into account.

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confidence: 99%

Species separation and modification of neutron diagnostics in inertial-confinement fusion

Inglebert

Canaud

Larroche

2014

EPL

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“…Here, we will present the symmetry analysis of a shock-ignition proposal [6,7] for the LMJ facility. In this facility, laser beam are organized in six cones around the vertical axis of the chamber, and the proposal considers to use two or four cones to irradiate directly a spherical capsule.…”

Section: Shock Ignition At Lmjmentioning

confidence: 99%

Symmetry issues in Directly Irradiated Targets

Ramis

Temporal

Canaud

et al. 2013

EPJ Web of Conferences

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Abstract. In direct drive Inertial Confinement Fusion (ICF), the typical laser beam to laser beam angle is around 30 • . This fact makes the study of the irradiation symmetry a genuine 3D problem. In this paper we use the three dimensional version of the MULTI hydrocode to assess the symmetry of such ICF implosions. More specifically, we study a shock-ignition proposal for the Laser-Mégajoule facility (LMJ) in which two of the equatorial beam cones are used to implode and precompress a spherical capsule (the "reference" capsule of HiPER project) made of 0.59 mg of pure Deuterium-Tritium mixture. The symmetry of this scheme is analysed and optimized to get a design inside the operating limits of LMJ. The studied configuration has been found essentially axial-symmetric, so that the use of 2D hydrocodes would be appropriate for this specific situation.

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“…A capsule [35] recently designed in the context of the French Laser MegaJoule (LMJ) facility [36,37] is considered. For this specific design it is assumed that the capsule will be directly irradiated [38] by the laser beams.…”

Section: Id Numerical Simulationsmentioning

confidence: 99%

“…A set of numerical simulations are performed with the MULTI-fs 1D radiation hydrodynamics code [32,33], which uses tabulated equations of state (SESAME), thermal heat conduction with flux harmonically limited to 8% and a 3D raytracing treatment of the laser-capsule interaction. A capsule [35] recently designed in the context of the French Laser MegaJoule (LMJ) facility [36,37] is considered. For this specific design it is assumed that the capsule will be directly irradiated [38] by the laser beams.…”

Section: D Numerical Simulationsmentioning

confidence: 99%

Ignition conditions for inertial confinement fusion targets with a nuclear spin-polarized DT fuel

et al. 2012

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The nuclear fusion cross-section is modified when the spins of the interacting nuclei are polarized. In the case of deuterium-tritium it has been theoretically predicted that the nuclear fusion cross-section could be increased by a factor S = 1.5 if all the nuclei were polarized. In inertial confinement fusion this would result in a modification of the required ignition conditions. Using numerical simulations it is found that the required hot-spot temperature and areal density can both be reduced by about 15% for a fully polarized nuclear fuel. Moreover, numerical simulations of a directly driven capsule show that the required laser power and energy to achieve a high gain scale as 5~°6 and S~°A respectively, while the maximum achievable energy gain scales as 5° 9 .

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

Cited by 4 publications

References 12 publications

Species separation and modification of neutron diagnostics in inertial-confinement fusion

Species separation and modification of neutron diagnostics in inertial-confinement fusion

Symmetry issues in Directly Irradiated Targets

Ignition conditions for inertial confinement fusion targets with a nuclear spin-polarized DT fuel

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