Experimental investigation of the two-plasmon decay instability in a CO/sub 2/-laser-produced plasma
Journal Article
·
· Phys. Fluids; (United States)
OSTI ID:6022713
The two-plasmon decay instability in a CO/sub 2/-laser-irradiated gas jet target is investigated by a variety of diagnostic techniques. Growth rates and wavenumber spectrum measured by picosecond resolution Thomson scattering of probe ruby laser light are found to be in agreement with linear theory. The instability is saturated by coupling to ion-acoustic fluctuations of twice the wavenumber of the fastest growing wave and is quenched by radial profile modification caused by decay wave ponderomotive forces. The instability is seen to reappear at periodic intervals. The number of hot electrons measured with an electron spectrometer scales exponentially with the duration of the instability, and the energy distribution is seen to evolve from a one-dimensional (1-D) to a three-dimensional (3-D) Maxwellian, indicating the importance of space-charge potentials. Finally, the observed (3/2)..omega../sub 0/ radiation is shown to be consistent with scattering of CO/sub 2/-laser radiation of two-plasmon decay fluctuations.
- Research Organization:
- Department of Physics, University of British Columbia, Vancouver, British Columbia V6T 2A6
- OSTI ID:
- 6022713
- Journal Information:
- Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:5; ISSN PFLDA
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Sun Dec 06 23:00:00 EST 1981
· Phys. Rev. Lett.; (United States)
·
OSTI ID:5834840
Measurement of growth rates, saturation, and decay of two-plasmon decay waves in a CO/sub 2/-laser--irradiated plasma
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·
Mon Oct 01 00:00:00 EDT 1984
· Phys. Rev. Lett.; (United States)
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Multiframe interferometric study of a laser irradiated plasma in the presence of the two plasmon decay instability
Journal Article
·
Thu Feb 28 23:00:00 EST 1991
· Physics of Fluids B; (USA)
·
OSTI ID:5903883
Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
700107* -- Fusion Energy-- Plasma Research-- Instabilities
CARBON DIOXIDE LASERS
COUPLING
FLUIDS
GAS LASERS
GASES
INELASTIC SCATTERING
INSTABILITY
INSTABILITY GROWTH RATES
ION ACOUSTIC WAVES
ION WAVES
JETS
LASER-PRODUCED PLASMA
LASERS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
PLASMONS
QUASI PARTICLES
RUBY LASERS
SATURATION
SCATTERING
SOLID STATE LASERS
THOMSON SCATTERING
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
700107* -- Fusion Energy-- Plasma Research-- Instabilities
CARBON DIOXIDE LASERS
COUPLING
FLUIDS
GAS LASERS
GASES
INELASTIC SCATTERING
INSTABILITY
INSTABILITY GROWTH RATES
ION ACOUSTIC WAVES
ION WAVES
JETS
LASER-PRODUCED PLASMA
LASERS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PLASMA WAVES
PLASMONS
QUASI PARTICLES
RUBY LASERS
SATURATION
SCATTERING
SOLID STATE LASERS
THOMSON SCATTERING