Laser irradiation of disk targets at 0. 53. mu. m wavelength
Journal Article
·
· Phys. Fluids; (United States)
OSTI ID:5905809
Results and analyses are presented for laser irradiation of Be-, CH-, Ti-, and Au-disk targets with 0.53 ..mu..m light in 3--200 J, 600--700 psec pulses, at nominal incident intensities from 3 x 10/sup 13/ to 5 x 10/sup 15/ W/cm/sup 2/. The measured absorptions are higher than observed in similar 1.06 ..mu..m irradiations, and are largely consistent with modeling which shows the importance of inverse-bremsstrahlung and Brillouin scattering. Observed red-shifted back-reflected light shows that Brillouin scattering occurs at low to moderate levels. Backscattering fractions up to 30% were observed in the f/2 focusing lens. The measured fluxes of multi-keV x rays indicate hot-electron fractions of 1% or less, with temperatures of 6 to 20 keV which are consistent with resonance absorption or perhaps 2..omega../sub p/e. Measurements show 30%--50% efficient conversion of absorbed light into sub-keV x rays, with time-, angular-, and spatial-emission distributions which are generally consistent with non-local-thermodynamic-equilibrium modeling using inhibited thermal electron transport.
- Research Organization:
- Lawrence Livermore National Laboratory, Livermore, California 94550
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5905809
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 26:8; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700106 -- Fusion Energy-- Plasma Research-- Plasma Production-- (-1987)
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ABSORPTION
ALKALINE EARTH METALS
AMPLITUDES
BACKSCATTERING
BERYLLIUM
BREMSSTRAHLUNG
BRILLOUIN EFFECT
COHERENT SCATTERING
CONVERSION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY ABSORPTION
ENERGY CONVERSION
GOLD
HYDROCARBONS
IMPLOSIONS
IONIZING RADIATIONS
LASER IMPLOSIONS
LASER-PRODUCED PLASMA
METALS
ORGANIC COMPOUNDS
PLASMA
PULSES
RADIATIONS
RED SHIFT
SCATTERING
TITANIUM
TRANSITION ELEMENTS
X RADIATION
700106 -- Fusion Energy-- Plasma Research-- Plasma Production-- (-1987)
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ABSORPTION
ALKALINE EARTH METALS
AMPLITUDES
BACKSCATTERING
BERYLLIUM
BREMSSTRAHLUNG
BRILLOUIN EFFECT
COHERENT SCATTERING
CONVERSION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY ABSORPTION
ENERGY CONVERSION
GOLD
HYDROCARBONS
IMPLOSIONS
IONIZING RADIATIONS
LASER IMPLOSIONS
LASER-PRODUCED PLASMA
METALS
ORGANIC COMPOUNDS
PLASMA
PULSES
RADIATIONS
RED SHIFT
SCATTERING
TITANIUM
TRANSITION ELEMENTS
X RADIATION