Non-Maxwellian electron distributions in time-dependent simulations of low-Z materials illuminated by a high-intensity X-ray laser
| Autor: | Philippe Zeitoun, Pedro Velarde, Alberto G. de la Varga, Agustín González, David Portillo, François de Gaufridy, Manuel Cotelo, Alfonso Barbas |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Free electron model Nuclear and High Energy Physics Radiation Bremsstrahlung Electron Photoionization 7. Clean energy 01 natural sciences X-ray laser Autoionization Physics::Plasma Physics Ionization 0103 physical sciences Energía Nuclear Atomic physics 010306 general physics 010303 astronomy & astrophysics Collisional excitation |
| Zdroj: | High Energy Density Physics, ISSN 1574-1818, 2013-09, Vol. 9, No. 3 High Energy Density Physics Archivo Digital UPM Universidad Politécnica de Madrid |
| Popis: | The interaction of high intensity X-ray lasers with matter is modeled. A collisional-radiative time-dependent module is implemented to study radiation transport in matter from ultrashort and ultraintense X-ray bursts. Inverse bremsstrahlung absorption by free electrons, electron conduction or hydrodynamic effects are not considered. The collisional-radiative system is coupled with the electron distribution evolution treated with a Fokker-Planck approach with additional inelastic terms. The model includes spontaneous emission, resonant photoabsorption, collisional excitation and de-excitation, radiative recombination, photoionization, collisional ionization, three-body recombination, autoionization and dielectronic capture. It is found that for high densities, but still below solid, collisions play an important role and thermalization times are not short enough to ensure a thermal electron distribution. At these densities Maxwellian and non-Maxwellian electron distribution models yield substantial differences in collisional rates, modifying the atomic population dynamics. |
| Databáze: | OpenAIRE |
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