Macroscopic laser–plasma interaction under strong non-local transport conditions for coupled matter and radiation
| Autor: | Jan Nikl, Milan Kuchařík, S. Weber, J. Limpouch, M. Holec, Michal Zeman |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Mechanics Plasma Laser 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas law.invention Nuclear Energy and Engineering Thermal radiation law Macroscopic scale 0103 physical sciences Radiative transfer lcsh:QC770-798 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Electrical and Electronic Engineering Diffusion (business) 010306 general physics Absorption (electromagnetic radiation) Inertial confinement fusion |
| Zdroj: | Matter and Radiation at Extremes, Vol 3, Iss 3, Pp 110-126 (2018) Matter and Radiation at Extremes |
| Popis: | Reliable simulations of laser–target interaction on the macroscopic scale are burdened by the fact that the energy transport is very often non-local. This means that the mean-free-path of the transported species is larger than the local gradient scale lengths and transport can be no longer considered diffusive. Kinetic simulations are not a feasible option due to tremendous computational demands, limited validity of the collisional operators and inaccurate treatment of thermal radiation. This is the point where hydrodynamic codes with non-local radiation and electron heat transport based on first principles emerge. The simulation code PETE (Plasma Euler and Transport Equations) combines both of them with a laser absorption method based on the Helmholtz equation and a radiation diffusion scheme presented in this article. In the case of modelling ablation processes it can be observed that both, thermal and radiative, transport processes are strongly non-local for laser intensities of 1013W/cm2 and above. In this paper simulations for various laser intensities and different ablator materials are presented, where the non-local and diffusive treatments of radiation transport are compared. Significant discrepancies are observed, supporting importance of non-local transport for inertial confinement fusion related studies as well as for pre-pulse generated plasma in ultra-high intensity laser–target interaction. Keywords: Inertial confinement fusion, Laser–plasma interaction, Radiation hydrodynamics, Transport theory, PACS Codes: 52.65.Kj, 52.57.-z, 52.50.Jm, 52.35.Tc, 52.25.Dg, 52.25.Fi, 44.40.+a, 47.70.Mc, 52.38.Dx, 52.38.Mf, 42.25.Bs, 52.25.Os |
| Databáze: | OpenAIRE |
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