Thermal transport studies of 351-nm laser-produced plasmas using extreme ultraviolet spectroscopy
Spectra from an extreme ultraviolet (XUV) grazing incidence spectrograph have been used in the study of thermal transport in laser plasmas. These measurements with XUV lines allowed a diagnosis of much lower temperatures in the heating front than had been previously measured. The OMEGA (24-beam, 351-nm) laser system at the University of Rochester was used to produce plasmas from glass microballoons coated with Al or Ti substrates and overcoated with a plastic ablator. Thermal transport was investigated by measuring the intensity of x-ray and XUV lines as a function of the thickness of the plastic overcoat. These measurements were then compared to the 1D hydrodynamic code l-smcapsIl-smcapsa-smcapsc-smcaps. Agreement between the hydrodynamic code and experiment could not be obtained with a reasonable value for the flux limiter ( fless than or equal to0.65). Consistent results were reached if nonuniform irradiation and flux inhibition is assumed. The measured burnthrough depths of around 9 ..mu..m are similar to previous measurements made with x-ray lines at fluxes below 10/sup 15/ W/cm/sup 2/. No evidence of preheat in the heat front was observed.
- Research Organization:
- Laboratory for Plasma and Fusion Energy Studies, University of Maryland, College Park, Maryland 20742
- OSTI ID:
- 5704558
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 63:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of barrier layers in burn-through experiments with 351-nm laser illumination
Effect of laser illumination nonuniformity on the analysis of time-resolved x-ray measurements in uv spherical transport experiments
Related Subjects
ALUMINIUM
LASER-PRODUCED PLASMA
ULTRAVIOLET SPECTRA
EXTREME ULTRAVIOLET RADIATION
PLASMA DIAGNOSTICS
THERMAL CONDUCTION
TITANIUM
MICROSPHERES
X RADIATION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY TRANSFER
HEAT TRANSFER
IONIZING RADIATIONS
METALS
PLASMA
RADIATIONS
SPECTRA
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
700208* - Fusion Power Plant Technology- Inertial Confinement Technology