Suppression of stimulated brillouin scattering by increased landau damping in multiple-ion-species hohlraum plasmas.
We demonstrate that multiple-ion-species plasmas greatly reduce stimulated Brillouin scattering (SBS) in high-electron temperature inertial confinement fusion hohlraums. Landau damping is increased by adding hydrogen to a CO(2) gas filled hohlraum. We find that the SBS reflectivity decreases monotonically with increasing hydrogen fraction from 18% to 3% with a simultaneous increase of laser beam transmission. Detailed simulations with a 3D laser-plasma interaction code are in agreement with the experimentally observed reduction in backscattered light.
Neumayer
P
P
L-399, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
Berger
R L
RL
Divol
L
L
Froula
D H
DH
London
R A
RA
Macgowan
B J
BJ
Meezan
N B
NB
Ross
J S
JS
Sorce
C
C
Suter
L J
LJ
Glenzer
S H
SH