Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions
| Autor: | Arnab Kar, P. B. Radha, Guillaume Duchateau, J. Carroll-Nellenback, Suxing Hu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Microphysics FOS: Physical sciences Dielectric Photoionization Mechanics Computational Physics (physics.comp-ph) Laser 01 natural sciences Physics - Plasma Physics 010305 fluids & plasmas law.invention Plasma Physics (physics.plasm-ph) Speckle pattern Impact ionization Planar law 0103 physical sciences Electron temperature 010306 general physics Physics - Computational Physics |
| Zdroj: | Physical Review E. 101 |
| ISSN: | 2470-0053 2470-0045 |
| Popis: | A microphysics model to describe the photoionization and impact ionization processes in dielectric ablator materials like plastic has been implemented into the one-dimensional hydrodynamic code LILAC for planar and spherical targets. At present, the initial plasma formation during the early stages of a laser drive is modeled in an ad hoc manner, until the formation of a critical surface. Implementation of the physics-based models predicts higher values of electron temperature and pressure than the ad hoc model. Moreover, the numerical predictions are consistent with previous experimental observations of the shine-through mechanism in plastic ablators. For planar targets, a decompression of the rear end of the target was observed that is similar to recent experiments. An application of this model is to understand the laser-imprint mechanism that is caused by nonuniform laser irradiation due to a single beam speckle. |
| Databáze: | OpenAIRE |
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