Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams
High-energy laser beams interacting with flowing plasmas can produce a plasma response that leads to deflection of the beam, beam bending. Such beams have usually a speckle structure generated by optical smoothing techniques that reduce the spatial and temporal coherence in the laser field pattern....
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Académie des sciences
2024-11-01
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| Series: | Comptes Rendus. Physique |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.200/ |
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| author | Hüller, S. Ludwig, J. D. T. Rose, H. A. Bruulsema, C. Farmer, W. Michel, P. Milder, A. L. Swadling, G. F. Rozmus, W. |
| author_facet | Hüller, S. Ludwig, J. D. T. Rose, H. A. Bruulsema, C. Farmer, W. Michel, P. Milder, A. L. Swadling, G. F. Rozmus, W. |
| author_sort | Hüller, S. |
| collection | DOAJ |
| description | High-energy laser beams interacting with flowing plasmas can produce a plasma response that leads to deflection of the beam, beam bending. Such beams have usually a speckle structure generated by optical smoothing techniques that reduce the spatial and temporal coherence in the laser field pattern. The cumulative plasma response from laser speckles slows down the velocity of the incoming flow by momentum conservation. For slightly super-sonic flow the cumulative plasma response to the ponderomotive force exerted by the beam speckle ensemble is the strongest, such that slowing down the flow to subsonic velocities leads eventually to the generation of a shock around the cross section of the beam. This scenario has been predicted theoretically and is confirmed here by our hydrodynamic simulations in two dimensions with speckled beams and in one dimension with a reduced model. The conditions of shock generation are given in terms of the ponderomotive pressure, speckle size and the flow velocity. The nonlinear properties of the shocks are analyzed using Rankine–Hugoniot relations. According to linear theory, temporally smoothed laser beams exhibit a higher threshold for shock generation. Numerical simulations with beams that are smoothed by spectral dispersion compare well with the linear theory results, diverging from those produced by beams with only a random phase plates in the nonlinear regime. The conditions necessary for shock generation and their effects on the laser plasma coupling in inertial confinement fusion (ICF) experiments are also discussed. |
| format | Article |
| id | doaj-art-3022030b669449e8b8af8c73353fbe72 |
| institution | Kabale University |
| issn | 1878-1535 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Physique |
| spelling | doaj-art-3022030b669449e8b8af8c73353fbe722025-02-07T13:53:46ZengAcadémie des sciencesComptes Rendus. Physique1878-15352024-11-0125G135336510.5802/crphys.20010.5802/crphys.200Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beamsHüller, S.0https://orcid.org/0000-0002-2812-9485Ludwig, J. D. T.1https://orcid.org/0000-0002-3247-605XRose, H. A.2https://orcid.org/0000-0003-2931-7960Bruulsema, C.3https://orcid.org/0000-0002-2879-3730Farmer, W.4https://orcid.org/0000-0001-6758-220XMichel, P.5https://orcid.org/0000-0002-7584-7420Milder, A. L.6https://orcid.org/0000-0002-9988-6109Swadling, G. F.7https://orcid.org/0000-0001-8370-8837Rozmus, W.8https://orcid.org/0009-0009-2660-3727Centre de Physique Théorique CPHT, CNRS UMR 7644, Ecole polytechnique, Insitut Polytechnique Paris, 91128 Palaiseau Cedex, FranceLawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USALos Alamos National Laboratory, Los Alamos, New Mexico, USA 87545Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USALawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USALawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USADepartment of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E1Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USADepartment of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E1High-energy laser beams interacting with flowing plasmas can produce a plasma response that leads to deflection of the beam, beam bending. Such beams have usually a speckle structure generated by optical smoothing techniques that reduce the spatial and temporal coherence in the laser field pattern. The cumulative plasma response from laser speckles slows down the velocity of the incoming flow by momentum conservation. For slightly super-sonic flow the cumulative plasma response to the ponderomotive force exerted by the beam speckle ensemble is the strongest, such that slowing down the flow to subsonic velocities leads eventually to the generation of a shock around the cross section of the beam. This scenario has been predicted theoretically and is confirmed here by our hydrodynamic simulations in two dimensions with speckled beams and in one dimension with a reduced model. The conditions of shock generation are given in terms of the ponderomotive pressure, speckle size and the flow velocity. The nonlinear properties of the shocks are analyzed using Rankine–Hugoniot relations. According to linear theory, temporally smoothed laser beams exhibit a higher threshold for shock generation. Numerical simulations with beams that are smoothed by spectral dispersion compare well with the linear theory results, diverging from those produced by beams with only a random phase plates in the nonlinear regime. The conditions necessary for shock generation and their effects on the laser plasma coupling in inertial confinement fusion (ICF) experiments are also discussed.https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.200/laser shocklaser plasma interactionoptically smoothed laser beams |
| spellingShingle | Hüller, S. Ludwig, J. D. T. Rose, H. A. Bruulsema, C. Farmer, W. Michel, P. Milder, A. L. Swadling, G. F. Rozmus, W. Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams Comptes Rendus. Physique laser shock laser plasma interaction optically smoothed laser beams |
| title | Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams |
| title_full | Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams |
| title_fullStr | Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams |
| title_full_unstemmed | Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams |
| title_short | Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams |
| title_sort | modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized icf scale laser beams |
| topic | laser shock laser plasma interaction optically smoothed laser beams |
| url | https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.200/ |
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