Time-resolved x-ray spectroscopy has been used to investigate ionization dynamics of a micrometer-sized nanosecond laser-plasma during the plasma start-up phase. Experimental results are modeled using two-dimensional hydrodynamic simulations and time-dependent collisional-radiative calculations. The study clearly shows that, due to the rapid expansion cooling, x-ray emission originates predominantly from a well-localized plasma region characterized by rapidly evolving hydrodynamic conditions. In this region, ionization dynamics is found to depart substantially from the steady-state regime. The measurements provide clear evidence of this transient ionization regime showing good agreement with the time-dependent calculations. (C) 2003 American Institute of Physics.
|Autori interni:||GIULIETTI, DANILO|
|Autori:||Gizzi LA; Cecchetti CA; Galimberti M; Giulietti A; Giulietti D; Labate L; Laville S; Tomassini P|
|Titolo:||Transient ionization in plasmas produced by point-like irradiation of solid Al targets|
|Anno del prodotto:||2003|
|Digital Object Identifier (DOI):||10.1063/1.1624603|
|Appare nelle tipologie:||1.1 Articolo in rivista|