title: Observation of saturation of energy transfer between copropagating beams in a flowing plasma.
abstract: Experiments demonstrate energy and power transfer between copropagating, same frequency, beams crossing at a small angle in a plasma with a Mach 1 flow. The process is interpreted as amplification of the low intensity probe beam by the stimulated scatter of the high intensity pump beam. The observed probe amplification increases slowly with pump intensity and decreases with probe intensity, indicative of saturation limiting the energy and power transfer due to ion-wave nonlinearities and localized pump depletion. The results are consistent with numerical modeling including ion-wave nonlinearities.
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA.
authors.forename: R K
authors.initials: RK
authors.lastname: Kirkwood
authors.forename: J D
authors.initials: JD
authors.lastname: Moody
authors.forename: A B
authors.initials: AB
authors.lastname: Langdon
authors.forename: B I
authors.initials: BI
authors.lastname: Cohen
authors.forename: E A
authors.initials: EA
authors.lastname: Williams
authors.forename: M R
authors.initials: MR
authors.lastname: Dorr
authors.forename: J A
authors.initials: JA
authors.lastname: Hittinger
authors.forename: R
authors.initials: R
authors.lastname: Berger
authors.forename: P E
authors.initials: PE
authors.lastname: Young
authors.forename: L J
authors.initials: LJ
authors.lastname: Suter
authors.forename: L
authors.initials: L
authors.lastname: Divol
authors.forename: S H
authors.initials: SH
authors.lastname: Glenzer
authors.forename: O L
authors.initials: OL
authors.lastname: Landen
authors.forename: W
authors.initials: W
authors.lastname: Seka