Spatial distribution of cluster size and density in supersonic jets as targets for intense laser pulses

Journal Article · Fri Aug 01 00:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.023201· OSTI ID:20640074

Dorchies, F; Blasco, F; Caillaud, T; Stevefelt, J; Stenz, C ^[1]; Boldarev, A S; Gasilov, V A ^[2]

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1. CELIA, UMR 5107 CNRS-Universite Bordeaux 1, 33405 Talence, (France)
2. Institute of Mathematical Modeling, Russian Academy of Sciences, Moscow 125047, Russia (Russian Federation)

Clusters were produced as a result of argon gas cooling during expansion through a supersonic nozzle. A two-dimensional model was set up in order to calculate gas expansion and partial condensation into clusters. Calculations were validated by experimental measurements using Mach-Zehnder interferometry and Rayleigh scattering, and performed with two types of nozzles (Laval and conical nozzles). These optical diagnostics together with numerical simulations led to the cluster size and density determination with spatial resolution through the gas and cluster jet. Cluster production was observed to be very sensitive to the nozzle geometry. Homogeneous gas and cluster jets were produced and characterized using conical nozzle geometry, with cluster density about 10{sup 12} per cm{sup 3}. Due to the fast valve-nozzle connecting geometry, shock waves have been observed at the Laval nozzle throat that strongly affected cluster production on the jet axis. Averaged cluster radius was observed to be easily tunable from 180 to 350 Aa by varying the upstream gas pressure P{sub 0} from 20 to 60 bars. A different scaling law, versus P{sub 0}, has been observed for this regime of large cluster, compared to Hagena's predictions for the small cluster regime.

• OSTI ID: 20640074
• Journal Information: Physical Review. A, Vol. 68, Issue 2; Other Information: DOI: 10.1103/PhysRevA.68.023201; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
36 MATERIALS SCIENCE
ARGON
ATOMIC CLUSTERS
COMPUTERIZED SIMULATION
DENSITY
GAS COOLING
GEOMETRY
INTERFEROMETRY
JETS
MACH-ZEHNDER INTERFEROMETER
NOZZLES
PARTICLE SIZE
PULSES
RAYLEIGH SCATTERING
SCALING LAWS
SHOCK WAVES
SPATIAL DISTRIBUTION
SPATIAL RESOLUTION
TWO-DIMENSIONAL CALCULATIONS
VALVES