Suppression of Stimulated Brillouin Scattering by Increased Landau Damping in Multiple-Ion-Species Hohlraum Plasmas

2008 ◽  
Vol 100 (10) ◽  
Author(s):  
P. Neumayer ◽  
R. L. Berger ◽  
L. Divol ◽  
D. H. Froula ◽  
R. A. London ◽  
...  
Keyword(s):  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Landau Damping ◽  
Stimulated Brillouin ◽  
Ion Species

Stimulated Brillouin scattering of an electromagnetic wave in a magnetoactive dissipative multi-ion-species plasma

1995 ◽  
Vol 53 (2) ◽  
pp. 127-133 ◽  
Author(s):  
M. Bose
Keyword(s):  
Growth Rate ◽  
Electromagnetic Wave ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Negative Ions ◽  
Stimulated Brillouin Scattering ◽  
Magnetized Plasma ◽  
Ion Acoustic Waves ◽  
Stimulated Brillouin ◽  
Ion Species

Stimulated Brillouin scattering of an electromagnetic wave is investigated analytically in a dissipative magnetized plasma in the presence of negative ions. With an increase in the number of negative ions (maintaining quasi-neutrality), it is found that the growth rate of ion-acoustic waves decreases very slowly up to 50% concentration (i.e. half of the total ionic contribution) of negative ions. Further increase in the number density of negative ions beyond 50% results in a sharp fall in growth rate.

scholarly journals Suppression of stimulated Brillouin scattering in laser beam hot spots

2009 ◽  
Vol 27 (4) ◽  
pp. 619-627 ◽  
Author(s):  
R.P. Sharma ◽  
Prerana Sharma ◽  
Shivani Rajput ◽  
A.K. Bhardwaj
Keyword(s):  
Laser Beam ◽  
Brillouin Scattering ◽  
Collisionless Plasma ◽  
Stimulated Brillouin Scattering ◽  
Landau Damping ◽  
Beam Radius ◽  
Plasma Parameters ◽  
Power Flux ◽  
Ion Acoustic Wave ◽  
Stimulated Brillouin

AbstractIn this article, filamentation of a high power laser beam in hot collisionless plasma is investigated considering the ponderomotive nonlinearity. We have studied the effect of self focusing (filamentation) of the laser beam on the localization of ion acoustic wave (IAW) and on stimulated Brillouin scattering (SBS) process. The nonlinear coupling between the laser beam and IAW results in the modification of the Eigen frequency of IAW; consequently, enhanced Landau damping of IAW and a modified mismatch factor in SBS process occur. Due to enhanced Landau damping, there is a reduction in the intensity of IAW wave, and the SBS process gets suppressed. For the typical laser plasma parameters: the laser power flux = 1016 W/cm2, laser beam radius (r0) = 12 µm, n/ncr = 0.11, and (Te/Ti) = 10, the SBS reflectivity is found to be suppressed approximately by 10%.

Dependence of stimulated Brillouin scattering on laser intensity, laserfnumber, and ion species in hohlraum plasmas

1996 ◽  
Vol 53 (3) ◽  
pp. 2747-2750 ◽  
Author(s):  
Juan C. Fernández ◽  
J. A. Cobble ◽  
B. H. Failor ◽  
W. W. Hsing ◽  
H. A. Rose ◽  
...  
Keyword(s):  
Laser Intensity ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Stimulated Brillouin ◽  
Ion Species
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