Transient ionization in plasmas produced by point-like irradiation of solid Al targets

Year: 2003

Authors: Gizzi LA., Cecchetti CA, Galimberti M., Giulietti A, Giulietti D., Labate L., Laville S., Tomassini P.

Autors Affiliation: CNR, Intens Laser Irradiat Lab IPCF, Area Ric, I-56124 Pisa, Italy;
Univ Pisa, Dipartimento Fis, Pisa, Italy;
INFM, Pisa, Italy;
Univ Bologna, Dipartmento Fis, Bologna, Italy

Abstract: 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.


Volume: 10 (12)      Pages from: 4601  to: 4604

KeyWords: laser-produced plasmas; X-ray emission; spectroscopy; resolution; dynamics
DOI: 10.1063/1.1624603

Citations: 5
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