Diagnostics of plasma produced by femtosecond laser pulse impact upon a target with an internal nanostructure

Journal Article · Wed Dec 15 00:00:00 EST 2010 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X10130283· OSTI ID:21443314

Skobelev, I Yu; Faenov, A Ya; Gasilov, S V; Pikuz, T A; Pikuz, S A ^[1]; Magunov, A I ^[2]; Boldarev, A S; Gasilov, V A ^[3]

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1. Russian Academy of Sciences, Joint Institute for High Temperatures (Russian Federation)
2. Russian Academy of Sciences, Prokhorov Institute of General Physics (Russian Federation)
3. Russian Academy of Sciences, Institute of Mathematical Modeling (Russian Federation)

X-ray diagnostics of the interaction of femtosecond laser pulses with intensities of 10{sup 16}-10{sup 18} W/cm{sup 2} with CO{sub 2} clusters and frozen nanosize water particles is carried out. The stage of cluster expansion and the formation of a plasma channel, which governs the parameters of the formed X-ray radiation source and accelerated ion flows, is studied. The measurements are based on recording spatially resolved X-ray spectra of H- and He-like oxygen ions. Utilization of Rydberg transitions for spectra diagnostics makes it possible to determine plasma parameters on a time scale of t {approx} 10 ps after the beginning of a femtosecond pulse. The role of the rear edge of the laser pulse in sustaining the plasma temperature at a level of {approx}100 eV in the stage of a nonadiabatic cluster expansion is shown. The analysis of the profiles and relative intensities of spectral lines allows one to determine the temperature and density of plasma electrons and distinguish the populations of 'thermal' ions and ions that are accelerated up to energies of a few tens of kiloelectronvolts. It is shown that the use of solid clusters made of frozen nanoscale water droplets as targets leads to a substantial increase in the number of fast He-like ions. In this case, however, the efficiency of acceleration of H-like ions does not increase, because the time of their ionization in plasma exceeds the time of cluster expansion.

• OSTI ID: 21443314
• Journal Information: Plasma Physics Reports, Vol. 36, Issue 13; Other Information: DOI: 10.1134/S1063780X10130283; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CARBON DIOXIDE
CLUSTER EXPANSION
DROPLETS
ELECTRON DENSITY
ELECTRON TEMPERATURE
INTERACTIONS
ION TEMPERATURE
IONIZATION
LASER RADIATION
NANOSTRUCTURES
PLASMA
PLASMA DIAGNOSTICS
SOLID CLUSTERS
WATER
X RADIATION
X-RAY SPECTRA
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
RADIATIONS
SERIES EXPANSION
SPECTRA