title: Validation of a turbulent Kelvin-Helmholtz shear layer model using a high-energy-density OMEGA laser experiment.
abstract: Following the successful demonstration of an OMEGA laser-driven platform for generating and studying nearly two-dimensional unstable plasma shear layers [Hurricane et al., Phys. Plasmas 16, 056305 (2009); Harding et al., Phys. Rev. Lett. 103, 045005 (2009)], this Letter reports on the first quantitative measurement of turbulent mixing in a high-energy-density plasma. As a blast wave moves parallel to an unperturbed interface between a low-density foam and a high-density plastic, baroclinic vorticity is deposited at the interface and a Kelvin-Helmholtz instability-driven turbulent mixing layer is created in the postshock flow due to surface roughness. The spatial scale and density profile of the turbulent layer are diagnosed using x-ray radiography with sufficiently small uncertainty so that the data can be used to ~0.17 μm) in the postshock plasma flow are consistent with an "inertial subrange," within which a Kolmogorov turbulent energy cascade can be active. An illustration of comparing the data set with the predictions of a two-equation turbulence model in the ares radiation hydrodynamics code is also presented.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA. hurricane1@llnl.gov
authors.forename: O A
authors.initials: OA
authors.lastname: Hurricane
authors.forename: V A
authors.initials: VA
authors.lastname: Smalyuk
authors.forename: K
authors.initials: K
authors.lastname: Raman
authors.forename: O
authors.initials: O
authors.lastname: Schilling
authors.forename: J F
authors.initials: JF
authors.lastname: Hansen
authors.forename: G
authors.initials: G
authors.lastname: Langstaff
authors.forename: D
authors.initials: D
authors.lastname: Martinez
authors.forename: H-S
authors.initials: HS
authors.lastname: Park
authors.forename: B A
authors.initials: BA
authors.lastname: Remington
authors.forename: H F
authors.initials: HF
authors.lastname: Robey
authors.forename: J A
authors.initials: JA
authors.lastname: Greenough
authors.forename: R
authors.initials: R
authors.lastname: Wallace
authors.forename: C A
authors.initials: CA
authors.lastname: Di Stefano
authors.forename: R P
authors.initials: RP
authors.lastname: Drake
authors.forename: D
authors.initials: D
authors.lastname: Marion
authors.forename: C M
authors.initials: CM
authors.lastname: Krauland
authors.forename: C C
authors.initials: CC
authors.lastname: Kuranz