Time resolved Thomson scattering measurements of the electron and ion temperatures in a high intensity laser--plasma interaction

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.866443· OSTI ID:5973363

Bernard, J E; Baldis, H A; Villeneuve, D M; Estabrook, K

Time resolved Thomson scattering from thermal plasma fluctuations is used to measure the electron and ion temperatures in the interaction of a short pulse (1 nsec FWHM), high intensity (approx.2 x 10/sup 14/ W/cm/sup 2/) CO/sub 2/ laser beam with a preformed carbon plasma. Time histories of the plasma temperatures with a temporal resolution of approx.150 psec were obtained in a single irradiation/discharge event by streaking the Thomson scattering spectrum. The experimentally measured electron temperature was found to be lower than that predicted by computer simulations. The discrepancy is attributed mainly to a decrease in the inverse bremsstrahlung absorption coefficient at high laser intensities (v/sub osc//v/sub e/>1) .

• Research Organization: Division of Physics, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
• OSTI ID: 5973363
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 30:11; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CARBON
CARBON DIOXIDE LASERS
CORRELATIONS
ELECTRON TEMPERATURE
ELEMENTS
FLUCTUATIONS
GAS LASERS
INELASTIC SCATTERING
ION TEMPERATURE
LASER-PRODUCED PLASMA
LASERS
NONMETALS
PLASMA
PLASMA DIAGNOSTICS
PULSES
RESOLUTION
SCATTERING
SIMULATION
TEMPERATURE EFFECTS
THOMSON SCATTERING
TIME RESOLUTION
TIMING PROPERTIES
VARIATIONS