Target physics for the megajoule laser (LMJ)

Holstein, P.A.; Babonneau, D.; Bowen, Christopher R.; Chaland, F.; Cherfils, C.; Dattolo, E.; Depierreux, S.; Galmiche, D.; Gauthier, P.; Giorla, J.; Jadaud, J. P.; Massé, L.; Monteil, M. C.; Poggi, F.; Riazuelo, G.; Seytor, P.; Wagon, F.

doi:10.1088/0029-5515/44/12/s07

Cited by 17 publications

(11 citation statements)

References 10 publications

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“…Energy transfer between laser beams crossing in a plasma is a topic of very high importance for indirect-drive ignition experiments [1][2][3][4] due to its impact on the implosion symmetry of the fuel capsule. [5][6][7][8][9][10][11][12][13][14][15][16] In this process, described as induced Brillouin scattering in Ref.…”

Section: Introductionmentioning

confidence: 99%

Energy transfer between laser beams crossing in ignition hohlraums

et al. 2009

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The full scale modeling of power transfer between laser beams crossing in plasmas is presented. A new model was developed, allowing calculations of the propagation and coupling of pairs of laser beams with their associated plasma wave in three dimensions. The complete set of laser beam smoothing techniques used in ignition experiments is modeled and their effects on crossed-beam energy transfer are investigated. A shift in wavelength between the beams can move the instability in or out of resonance and hence allows tuning of the energy transfer. The effects of energy transfer on the effective beam pointing and on symmetry have been investigated. Several ignition designs have been analyzed and compared, indicating that a wavelength shift of up to 2 Å between cones of beams should be sufficient to control energy transfer in ignition experiments.

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Section: Introductionmentioning

confidence: 99%

Energy transfer between laser beams crossing in ignition hohlraums

et al. 2009

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“…For the regimes of interest where surface tension plays a role, it is not generally necessary to use separate electron and ion temperatures as is done in the more traditional ICF simulation codes [1][2][3][4] . ALE-AMR also does not include sliding interfaces, which are unnecessary in the types of problems being targeted for simulation.…”

Section: Lagrangian Dynamicsmentioning

confidence: 99%

“…A traditional means of modeling plasma in the high energy density regime is through a fluid description with an ALE (Arbitrary Lagrangian Eulerian) methodology, due to the Lagrangian formulation's ability to deal with large displacements and the meshuntangling capabilities of the ALE method. Examples of these codes for inertial confinement fusion (ICF) include CHIC, Lasnex, Hydra, and FCI2 [1][2][3][4] . Generally, in an ALE method, the pure Lagrangian time-advance phase is followed by a remap step.…”

Section: Introductionmentioning

confidence: 99%

Surface tension models for a multi-material ALE code with AMR

et al. 2017

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a b s t r a c tA number of surface tension models have been implemented in a 3D multi-physics multi-material code, ALE-AMR, which combines Arbitrary Lagrangian Eulerian (ALE) hydrodynamics with Adaptive Mesh Refinement (AMR). ALE-AMR is unique in its ability to model hot radiating plasmas, cold fragmenting solids, and most recently, the deformation of molten material. The surface tension models implemented include a diffuse interface approach with special numerical techniques to remove parasitic flow and a height function approach in conjunction with a volume-fraction interface reconstruction package. These surface tension models are benchmarked with a variety of test problems. Based on the results, the height function approach using volume fractions was chosen to simulate droplet dynamics associated with extreme ultraviolet (EUV) lithography.

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“…Unlike Refs. [1][2][3][4], we do not use separate electron and ion temperatures, because in our problems of interest (NIF debris and shrapnel, for example) equilibration is permitted. A possible extension of the code would be to include such effects with a two-temperature model.…”

Section: Lagrangian Dynamicsmentioning

confidence: 99%

Multi-Material ALE with AMR for Modeling Hot Plasmas and Cold Fragmenting Materials

Koniges¹,

Masters²,

Fisher³

et al. 2015

Plasma Sci. Technol.

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We have developed a new 3D multi-physics multi-material code, ALE-AMR, which combines Arbitrary Lagrangian Eulerian (ALE) hydrodynamics with Adaptive Mesh Refinement (AMR) to connect the continuum to the microstructural regimes. The code is unique in its ability to model hot radiating plasmas and cold fragmenting solids. New numerical techniques were developed for many of the physics packages to work efficiently on a dynamically moving and adapting mesh. We use interface reconstruction based on volume fractions of the material components within mixed zones and reconstruct interfaces as needed. This interface reconstruction model is also used for void coalescence and fragmentation. A flexible strength/failure framework allows for pluggable material models, which may require material history arrays to determine the level of accumulated damage or the evolving yield stress in J2 plasticity models. For some applications laser rays are propagating through a virtual composite mesh consisting of the finest resolution representation of the modeled space. A new 2nd order accurate diffusion solver has been implemented for the thermal conduction and radiation transport packages. One application area is the modeling of laser/target effects including debris/shrapnel generation. Other application areas include warm dense matter, EUV lithography, and material wall interactions for fusion devices.

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Target physics for the megajoule laser (LMJ)

Cited by 17 publications

References 10 publications

Energy transfer between laser beams crossing in ignition hohlraums

Energy transfer between laser beams crossing in ignition hohlraums

Surface tension models for a multi-material ALE code with AMR

Multi-Material ALE with AMR for Modeling Hot Plasmas and Cold Fragmenting Materials

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