Spectroscopic characterization of an ultrashort-pulse-laser-driven Ar cluster target incorporating both Boltzmann and particle-in-cell models

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M. E. Sherrill, J. Abdallah, Jr., and G. Csanak
Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

E. S. Dodd
Applied Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Y. Fukuda, Y. Akahane, M. Aoyama, N. Inoue, H. Ueda, and K. Yamakawa
Advanced Photon Research Center, Japan Energy Research Institute (JAERI), 8-1 Umemidai, Kizu-cho, Souraku-gun, Kyoto 619-0215, Japan

A. Ya. Faenov, A. I. Magunov, T. A. Pikuz, and I. Yu. Skobelev
Multicharged Ions Spectra Data Center of VNIIFTRI, Mendeleevo, Moscow Region 141570, Russia

Received 16 June 2005; revised 21 February 2006; published 19 June 2006

Amodel that solves simultaneously both the electron and atomic kineticswas used to generate a synthetic He and satellite x-rayspectra to characterize a high intensity ultrashort laser driven Arcluster target experiment. In particular, level populations were obtained froma detailed collisional-radiative model where collisional rates were computed froma time varying electron distribution function obtained from the solutionof the zero-dimensional Boltzmann equation. In addition, a particle-in-cell simulationwas used to model the laser interaction with the clustertarget and provided the initial electron energy distribution function (EEDF)for the Boltzmann solver. This study suggests that a highdensity average, N_a_high, of 3.2×10²⁰ cm^–3 was held by the systemfor a time, delta tau , of 5.7 ps, and during this timethe plasma was in a highly nonequilibrium state in boththe EEDF and the ion level populations.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.066404
DOI:	10.1103/PhysRevE.73.066404
PACS:	52.50.Jm; 52.70.La; 52.65.Rr; 36.40.Vz 52.50.Jm Plasma production and heating by laser beams including laser–foil, laser–cluster, etc 52.70.La X-ray and -ray plasma diagnostic measurements 52.65.Rr Particle-in-cell method (plasma simulation) 36.40.Vz Optical properties of atomic and molecular clusters YEAR: 2006
KEYWORDS:	plasma simulation, plasma kinetic theory, plasma collision processes, Boltzmann equation, plasma transport processes

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