2013
DOI: 10.1016/j.hedp.2013.05.010
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Non-Maxwellian electron distributions in time-dependent simulations of low-Z materials illuminated by a high-intensity X-ray laser

Abstract: The interaction of high intensity X-ray lasers with matter is modeled. A collisional-radiative timedependent 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 sponta… Show more

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Cited by 21 publications
(16 citation statements)
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“…Evolving a nonthermal free electron distribution that is fully self-consistent with all of the atomic processes is beyond the scope of this article. Instead, we approximate the temporal evolution of the hot electron distribution to be in broad agreement with other studies [63,64]. As the change in electron density is minimal, the spectra are insensitive to the ionization potential depression model that is used [19,35,36].…”
Section: Resultssupporting
confidence: 52%
“…Evolving a nonthermal free electron distribution that is fully self-consistent with all of the atomic processes is beyond the scope of this article. Instead, we approximate the temporal evolution of the hot electron distribution to be in broad agreement with other studies [63,64]. As the change in electron density is minimal, the spectra are insensitive to the ionization potential depression model that is used [19,35,36].…”
Section: Resultssupporting
confidence: 52%
“…Moreover, our results are for solid-density Al, which has a six-times higher atomic density, for which thermalization times should be even shorter. Perhaps surprisingly, the effect of nonthermal electrons in the distribution was also seen to initially lower the observed rates of impact ionization 36 . The reason for this is that in the instant thermalization approximation, all the absorbed energies that do not go into ionization contribute directly to the temperature, whereas for nonthermal distributions some of that energy is syphoned off to the high-energy electrons, leading to a cooler thermal electron component.…”
Section: Discussionmentioning
confidence: 89%
“…36. At the highest densities at which they performed their calculations, of 10 22 atoms cm À 3 , the authors report a persistent presence of nonthermal Auger and photoelectrons during the entire duration of the pulse.…”
Section: Discussionmentioning
confidence: 92%
“…Recently, a Fokker-Planck treatment of non-thermal electrons was implemented into an atomic kinetics calculation to model more comprehensively the free-electron relaxation dynamics in a neon plasma irradiated by an Xray FEL 38 . Calculations using the same model, but conducted for an Al plasma at solid density 39 , show results which are consistent with the overall plasma evolution presented above using our somewhat simpler model.…”
Section: Auger Heating and Instantaneous Thermalizationmentioning
confidence: 99%