scholarly journals MAGNETIZED PLASMA PARAMETRIC RESONANCE IN NON-MONOCHROMATIC PUMP-WAVE

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-557-C7-558
Author(s):  
Yu. M. Aliev ◽  
O. M. Gradov ◽  
V. Stefan
Keyword(s):  
Parametric Resonance ◽  
Pump Wave ◽  
Magnetized Plasma

Scattering of electromagnetic waves by anomalous fluctuations of a magnetized plasma

1990 ◽  
Vol 43 (2) ◽  
pp. 165-172 ◽  
Author(s):  
V. N. Pavlenko ◽  
V. G. Panchenko
Keyword(s):  
Cross Section ◽  
Electromagnetic Waves ◽  
Pump Wave ◽  
Density Fluctuations ◽  
Scattering Cross Section ◽  
Magnetized Plasma ◽  
Lower Hybrid ◽  
Scattering Cross ◽  
Parametric Decay ◽  
Ion Acoustic

Fluctuations and scattering of transverse electromagnetic waves by density fluctuations in a magnetized plasma in the presence of parametric decay of the pump wave are investigated. The spectral density of electron-density fluctuations is calculated. It is shown that the differential scattering cross-section has sharp maxima at the ion-acoustic and lower-hybrid frequencies when parametric decay of the lower-hybrid pump wave occurs. We note that scattering at the ion-acoustic frequency is dominant. When the pump-wave amplitude tends to the threshold strength of the electric field the scattering cross-section increases anomalously, i.e. there is critical opalescence.

Stimulated Raman backscattering in a magnetized plasma

1978 ◽  
Vol 19 (2) ◽  
pp. 313-324 ◽  
Author(s):  
Joseph E. Willett ◽  
Behrooz Maraghechi
Keyword(s):  
Cold Plasma ◽  
Pump Wave ◽  
Electron Plasma ◽  
Magnetized Plasma ◽  
Threshold Power ◽  
Pump Frequency ◽  
Electron Plasma Wave ◽  
Parametric Decay ◽  
Electromagnetic Pump ◽  
Stimulated Raman Backscattering

The parametric decay of an intense electromagnetic (pump) wave into a back-scattered electromagnetic wave and an electron plasma wave is considered. The dispersion relation for a homogeneous magnetized plasma in the presence of the pump wave is developed in the cold-plasma approximation with the pump frequency large compared to the cyclotron and plasma frequencies. Formulae are derived for the growth rate γ and threshold power PT associated with the instability. The effects of the magnitude and direction of the static magnetic field on γ and PT are studied numerically.

Decay instability of cirularly polarized waves into cirularly polarized and Langmuir waves in a magnetized plasma

1974 ◽  
Vol 11 (1) ◽  
pp. 99-109 ◽  
Author(s):  
Kai Fong Lee
Keyword(s):  
Pump Wave ◽  
Parametric Instability ◽  
Perturbation Expansion ◽  
Langmuir Wave ◽  
Magnetized Plasma ◽  
Multiple Time ◽  
Langmuir Waves ◽  
Left Hand ◽  
Electromagnetic Pump ◽  
Polarized Waves

A study is made of a parametric instability in a magnetized plasma in which an electromagnetic pump wave of either right- or left-hand circular polarization decays into a Langmuir wave and another circularly polarized wave, all with wave vectors colinear with the external magnetic field. The analysis is based on a multiple-time-scale perturbation expansion of the fluid equations, incorporating the effects of temperature, collisions, and the spatial variation of the pump wave. The threshold values of the pump field intensity required for instability and the growth rates above threshold are calculated.

Theory of parametric resonance in a current carrying magnetized plasma

1979 ◽  
Vol 22 (6) ◽  
pp. 1154 ◽  
Author(s):  
Yu. M. Aliev ◽  
V. Stefan
Keyword(s):  
Parametric Resonance ◽  
Magnetized Plasma ◽  
A Current

Applications of the wave kinetic approach: from laser wakefields to drift wave turbulence

2010 ◽  
Vol 76 (6) ◽  
pp. 903-914 ◽  
Author(s):  
R. M. G. M. TRINES ◽  
R. BINGHAM ◽  
L. O. SILVA ◽  
J. T. MENDONÇA ◽  
P. K. SHUKLA ◽  
...  
Keyword(s):  
Pump Wave ◽  
Random Phase ◽  
Zonal Flow ◽  
Magnetized Plasma ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave ◽  
Alternative Approach ◽  
Photon Acceleration ◽  
Flow Turbulence

AbstractNonlinear wave-driven processes in plasmas are normally described by either a monochromatic pump wave that couples to other monochromatic waves, or as a random phase wave coupling to other random phase waves. An alternative approach involves a random or broadband pump coupling to monochromatic and/or coherent structures in the plasma. This approach can be implemented through the wave-kinetic model. In this model, the incoming pump wave is described by either a bunch (for coherent waves) or a sea (for random phase waves) of quasi-particles. This approach has been applied to both photon acceleration in laser wakefields and drift wave turbulence in magnetized plasma edge configurations. Numerical simulations have been compared to experiments, varying from photon acceleration to drift mode-zonal flow turbulence, and good qualitative correspondences have been found in all cases.

scholarly journals Parametric Instabilities in a Magnetized Plasma

1982 ◽  
Vol 35 (4) ◽  
pp. 409
Author(s):  
Bhimsen K Shivamoggi
Keyword(s):  
Magnetic Field ◽  
Pump Wave ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
Magnetized Plasma ◽  
Stimulated Scattering ◽  
Electromagnetic Pump ◽  
Background Magnetic Field ◽  
Parametric Instabilities ◽  
Stimulated Brillouin

This paper makes a study of stimulated Raman scattering and stimulated Brillouin scattering of an incident electromagnetic pump wave in a magnetized plasma. The background magnetic field is taken to be parallel to the pump electric field. The growth rates of the two stimulated-scattering instabilities are found to be reduced in the presence of the background magnetic field.

Enhanced fluctuations in a magnetized plasma due to the presence of an electromagnetic wave

1976 ◽  
Vol 16 (1) ◽  
pp. 37-45 ◽  
Author(s):  
J. Larsson ◽  
L. Stenflo ◽  
R. Tegeback
Keyword(s):  
Electromagnetic Wave ◽  
Electric Field ◽  
Pump Wave ◽  
Finite Amplitude ◽  
Magnetized Plasma ◽  
Fluctuation Spectrum ◽  
Field Fluctuation

We calculate the electric field fluctuation spectrum in a magnetized plasma considering the influence of a finite amplitude pump wave.

Influence of an upper-hybrid pump on temperature relaxation processes in a magnetized plasma

2008 ◽  
Vol 74 (1) ◽  
pp. 47-51
Author(s):  
V. N. PAVLENKO ◽  
V. G. PANCHENKO
Keyword(s):  
Acoustic Waves ◽  
Pump Wave ◽  
Magnetized Plasma ◽  
Relaxation Processes ◽  
Plasma Parameters ◽  
Ion Acoustic Waves ◽  
Turbulent Fluctuations ◽  
Inverse Relaxation Time ◽  
Temperature Relaxation ◽  
Convective Cells

AbstractBy means of kinetic fluctuation theory, the relaxation process between the electron and ion temperatures in a magnetized homogeneous plasma is considered. The cases when the external upper-hybrid pump wave excites modified convective cells and ion-acoustic waves are analysed. The inverse relaxation time in the regime where the turbulent fluctuations are developed is calculated for these cases and its dependence on the pump wave and plasma parameters is deduced.

Scattering of electromagnetic waves in a magnetized plasma with an HF pump

2002 ◽  
Vol 67 (5) ◽  
pp. 309-320 ◽  
Author(s):  
V. N. PAVLENKO ◽  
V. G. PANCHENKO ◽  
S. A. NAZARENKO
Keyword(s):  
Cross Sections ◽  
Electromagnetic Waves ◽  
Pump Wave ◽  
Parametric Instability ◽  
Density Fluctuations ◽  
Magnetized Plasma ◽  
Lower Hybrid ◽  
Ion Temperature ◽  
Temperature Anisotropy ◽  
Transverse Electromagnetic

The scattering of transverse electromagnetic waves by turbulent density fluctuations in a magnetized plasma in the presence of external pump fields is investigated. The case where a lower-hybrid pump wave decays into daughter and ion-cyclotron waves in a plasma with ion-temperature anisotropy is considered. The situation where an upper-hybrid pump wave parametrically excites modified convective cells and electron drift waves is also analyzed. The differential scattering cross-sections in the region above the parametric instability thresholds for these three cases are calculated.

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