title: Beyond the gain exponent: Effect of damping, scale length, and speckle length on stimulated scatter.
abstract: Three-dimensional wave propagation simulations and experiments show that the gain exponent, an often used metric to assess the likelihood of stimulated Brillouin scatter, is insufficient and must be augmented with another parameter, Nr, the ratio of the resonance length, Lres, to the laser speckle length. The damping rate of ion acoustic waves, ν, and thus Lres, which is proportional to ν, are easily varied with plasma species composition, e.g., by varying the ratio of hydrogen and carbon ions. As Nr decreases, stimulated Brillouin scattering increases despite the same gain exponent.
authors: Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors: R L
authors: RL
authors: Berger
authors: Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors: L J
authors: LJ
authors: Suter
authors: Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors: L
authors: L
authors: Divol
authors: Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors: R A
authors: RA
authors: London
authors: Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors: T
authors: T
authors: Chapman
authors: Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA.
authors: D H
authors: DH
authors: Froula
authors: Lawrence Livermore National Laboratory, University of California, P.O. Box 808, Livermore, California 94551, USA.
authors: N B
authors: NB
authors: Meezan
authors: ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrae 1, 64291 Darmstadt, Germany.
authors: P
authors: P
authors: Neumayer
authors: SLAC National Accelerator Laboratory, 2575 Sand Hill Road, MS 72 Menlo Park, California 94025, USA.
authors: S H
authors: SH
authors: Glenzer