Collective stimulated Brillouin backscatter

Details Collective stimulated Brillouin backscatter Collective stimulated Brillouin backscatter

2007-10-02

arxiv.org/abs/0710.0634v1

Physics

Plasma Physics

4 pages, 3 figures

Scientific paper

We develop the statistical theory of the stimulated Brillouin backscatter (BSBS) instability of a spatially and temporally partially incoherent laser beam for laser fusion relevant plasma. We find a new regime of BSBS which has a much larger threshold than the classical threshold of a coherent beam in long-scale-length laser fusion plasma. Instability is collective because it does not depend on the dynamics of isolated speckles of laser intensity, but rather depends on averaged beam intensity. We identify convective and absolute instability regimes. Well above the incoherent threshold the coherent instability growth rate is recovered. The threshold of convective instability is inside the typical parameter region of National Ignition Facility (NIF) designs although current NIF bandwidth is not large enough to insure dominance of collective instability and suggests lower instability threshold due to speckle contribution. In contrast, we estimate that the bandwidth of KrF-laser-based fusion systems would be large enough.

Affiliated with

Also associated with

No associations

Rating

Collective stimulated Brillouin backscatter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Collective stimulated Brillouin backscatter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Collective stimulated Brillouin backscatter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-285056