Detailed 266 nm Thomson scattering measurements of a laser-heated plasma
- Department of Applied Science, University of California, Davis-Livermore and Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- Department of Applied Science and Plasma Research Group, University of California, Davis, California 95616 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Collective Thomson scattering at 266 nm is used to obtain spatially resolved, two-dimensional electron density, temperature, and radial drift profiles of a collisional laser plasma (critical density, {ital n}{sub {ital c}} =1{times}10{sup 21} cm{sup {minus}3}). An ultraviolet diagnostic wavelength minimizes the complicating effects of inverse bremsstrahlung and refractive turning in the coronal region of interest, where electron densities approach {ital n}{sub {ital c}}/10. Laser plasmas of this type are important because they model some of the aspects of the plasmas found in high-gain laser-fusion pellets irradiated by long pulse widths ({ital t}{sub {ital L}}{approx gt}10 nsec), where laser light is absorbed mostly in the corona. The experimental results and LASNEX (Comments Plasma Phys. Controlled Fusion {bold 2}, 51 (1975)) simulations agree within a percent standard deviation of 40% for electron density and 50% for electron temperature and radial drift velocity. Thus it is shown that the hydrodynamics equations with classical coefficients and the numerical approximations in LASNEX are valid models of laser-heated, highly collisional plasmas.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7234342
- Journal Information:
- Physics of Fluids B; (United States), Vol. 4:6; ISSN 0899-8221
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LASER-PRODUCED PLASMA
THOMSON SCATTERING
BREMSSTRAHLUNG
COLLISIONAL PLASMA
ELECTRON DENSITY
ELECTRON TEMPERATURE
LASER FUSION REACTORS
ULTRAVIOLET RADIATION
ELECTROMAGNETIC RADIATION
INELASTIC SCATTERING
PLASMA
RADIATIONS
SCATTERING
THERMONUCLEAR REACTORS
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)