Two-dimensional electron density, temperature, and radial drift profiles of a laser plasma by 266 nm collective Thomson scattering

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143437· OSTI ID:7028110

Cameron, S M; Tracy, M D ^[1]; Estabrook, K G ^[2]; DeGroot, J S ^[3]

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1. Department of Applied Science, University of California, Davis, Davis, California 95616 (United States) Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
3. Department of Applied Science and Plasma Research Group, University of California, Davis, Davis, California 95616 (United States)

Collective Thomson scattering measurements performed at 266 nm on an underdense, long scalelength laser-produced aluminum plasma ({ital n}{sub {ital c}}{similar to}10{sup 21} cm{sup {minus}3}, {ital Z}{similar to}7, {ital T}{sub {ital e}}{ge}50 eV, {ital L}{ge}100 {mu}m) under moderate irradiance conditions (10{sup 11} W/cm{sup 2}) are used to obtain temporally integrated, spatially resolved (30 {mu}m) electron temperature, density, and radial fluid velocity contours. For an ultraviolet diagnostic wavelength, the effects of inverse bremsstrahlung heating perturbations and refractive turning are significantly reduced, allowing high density coronal conditions in the vicinity of one-tenth critical to be investigated. Detailed knowledge of these plasma conditions are fundamental prerequisites for understanding the distributed absorption process within fusion plasmas and for validation of the modeling accuracy of hydrodynamic codes. Fluid equations with classical coefficients should accurately apply to the plasma in these experiments because electron thermal transport is in the Spitzer regime, and the authors report relatively good agreement between the experimental results and two-dimensional LASNEX simulations.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7028110
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:11; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320* -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
700411 -- Inertial Confinement Devices-- (1992-)
ABSORPTION
ALUMINIUM
BREMSSTRAHLUNG
COMPUTER CODES
DATA
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELEMENTS
ENERGY ABSORPTION
EXPERIMENTAL DATA
FLUID MECHANICS
HEATING
HYDRODYNAMICS
INELASTIC SCATTERING
INFORMATION
LASER-PRODUCED PLASMA
MECHANICS
METALS
NUMERICAL DATA
PLASMA
PLASMA DIAGNOSTICS
PLASMA DRIFT
PLASMA HEATING
RADIATIONS
SCATTERING
SORPTION
THOMSON SCATTERING
ULTRAVIOLET RADIATION
VELOCITY