Raman and two-plasmon decay instabilities in a magnetized plasma

Journal Article · Thu Nov 01 04:00:00 EST 1984 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864577· OSTI ID:6156006

Barr, H C; Boyd, T J.M.; Gardner, L R.T.; Rankin, R

The effects of a magnetic field on the Raman and two-plasmon decay instabilities are studied in the region of the quarter-critical density of laser produced plasmas where both are coincident. Two-plasmon decay of the incident extraordinary wave into two upper-hybrid waves may now occur in the direction of propagation of the incident radiation driven by the electrostatic component of the extraordinary mode. Maximum growth rates of both the Raman and two-plasmon decay instabilities are increased by the magnetic field. For the two-plasmon decay, the frequency shift from ..omega../sub 0//2, where ..omega../sub 0/ is the frequency of the incident radiation, is increased by the magnetic field by amounts which can exceed the thermal shift. This magnetic shift derives from the electromagnetic correction to the dispersion relation of upper-hybrid waves and, consequently, is not found in an electrostatic approximation. For the Raman instability at the reflection point of the scattered extraordinary wave, the red shift of the back-scattered radiation due to the plasma temperature is reduced by any magnetic field present and can be changed to a blue shift if the field is large enough.

• Research Organization: University of Wales, UCNW, Bangor, Wales
• OSTI ID: 6156006
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 27:11; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
COHERENT SCATTERING
DISPERSION RELATIONS
ELECTROMAGNETIC RADIATION
INSTABILITY
INSTABILITY GROWTH RATES
LASER-PRODUCED PLASMA
MAGNETIC FIELDS
MAGNETIZATION
PARAMETRIC INSTABILITIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATIONS
RAMAN EFFECT
RED SHIFT
SCATTERING
SPECTRAL SHIFT