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  • 1
    Electronic Resource
    Electronic Resource
    High-speed gated x-ray imagers (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1793-1796 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Single- and multiframe gated x-ray images with time resolution as fast as 150 ps are described. These systems are based on the gating of microchannel plates in a stripline configuration. The gating voltage comes from the avalanche breakdown of a reverse biased p–n junction producing high-power voltage pulses as short as 70 ps. Results from single- and four-frame x-ray cameras used on Nova are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140115
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  • 2
    Electronic Resource
    Electronic Resource
    Gated x-ray pinhole camera for time-resolved 2-D images of laser-driven targets (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1850-1850 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the operation of a multiframe x-ray pinhole camera with time resolutions on the order of 200 ps. This diagnostic provides complementary information to that obtained with a conventional x-ray streak camera. We will describe the characterization of the instrument, obtained optically and electronically, and show x-ray data obtained from laser fusion experiments. This work was performed under the auspices of the U. S. DOE by the Lawrence Livermore National Laboratory under Contract No. W-7405-ENG-48.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140081
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  • 3
    Electronic Resource
    Electronic Resource
    Time-resolved x-ray line intensities for diagnostics of laser-produced plasmas (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 844-844 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a streaked crystal spectrograph for time-resolving x-ray lines from laser-produced plasmas. The spectrograph combines an ellipsoidally curved crystal and x-ray streak camera to optimize spectral coverage and resolution, even though the instrument is located a meter from the source. The instrument has been used at Novette to measure S lines doped in concentrations of 4% in the center of CH foils. Time histories of the temperature and density of the CH plasma have been derived from relative intensities of the S lines. Details of the experiment and analysis will be presented along with the instrument design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138061
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of absorption and Brillouin sidescattering from planar plasmas produced by 0.53 μm laser light (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1295-1300 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of the absorption and scattering of laser light by planar, laser-produced plasmas is reported. Up to 4 kJ of 0.53 μm laser light irradiated thick, gold targets in 1 nsec pulses at intensities up to 4×1015 W/cm2. The absorption was determined from measurements of the scattered light by an array of about 100 detectors. Stimulated Brillouin sidescattering, identified by the angular distribution and spectrum of the scattered light, exceeded 10% of the laser energy for intensities above 1015 W/cm2. The observations are compared to those of previously reported experiments. It is suggested that a combination of collisional absorption, enhanced backscattering, and convective sidescattering produces the observed dependence on laser intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858953
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  • 5
    Electronic Resource
    Electronic Resource
    Reply to the comments of Simon and Short (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1342-1343 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In their comment, Simon and Short argue that their enhanced plasma wave model remains a possible explanation of the data reported in a previous paper [Phys. Fluids 31, 3130 (1988)]. While their clarifications of this model do invalidate the single, numerical argument used in that paper to reject it, a number of reasons remain to be skeptical of this model. In the present reply, these reasons are summarized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858965
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  • 6
    Electronic Resource
    Electronic Resource
    Hydrodynamic expansion of exploding-foil targets irradiated by 0.53 μm laser light (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1089-1096 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experiment is reported in which several diagnostics were used to study the hydrodynamic expansion of exploding-foil targets. The CH targets, 1–3 μm thick, were irradiated with 3–4 kJ of 0.53 μm laser light in 1 nsec pulses. The electron density was diagnosed using the transmission and scattering of light at the laser frequency, the scattering of light at 3/2 of the laser frequency, the spectrum of Raman-scattered light, the x-ray spectrum from doped targets, and the image of the ultraviolet bremsstrahlung emission from the plasma. The measurements were consistent with one another, but generally were not consistent with two-dimensional computer simulations. The targets burned through later and took longer after burnthrough to reach quarter-critical density than predicted. This discrepancy may be a consequence of excessive profile steepening caused by the local, heat-transport model used in the simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858979
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  • 7
    Electronic Resource
    Electronic Resource
    Broadening of interfacial solitary waves (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2486-2490 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Progressing interfacial gravity waves are considered for two fluids of differing densities confined in a channel of finite vertical extent and infinite horizontal extent. An integrodifferential equation for the unknown shape of the interface is derived. This equation is discretized and the resulting algebraic equations are solved using Newton's method. It is found that, for a range of heights and densities of the two fluids, the system supports a branch of solitary waves. Progression along the branch produces a broadening of the wave. With increased broadening both the amplitude and the wave speed approach limiting values. The results are in good agreement with analytical studies and indicate the existence of internal surges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866602
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  • 8
    Electronic Resource
    Electronic Resource
    Studies of Raman scattering from overdense targets irradiated by several kilojoules of 0.53 μm laser light (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3130-3142 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper a study of stimulated Raman scattering (SRS) from relatively planar plasmas irradiated with short-wavelength (0.53 μm) laser light is reported. The Novette Laser Facility [Laser Part. Beams 3, 173 (1985)] produced several kilojoules of light in 1 nsec, which allowed it to irradiate a large spot with enough intensity to produce significant Raman scattering. These experiments measured the fluence, angular distribution, spectrum, and timing of the Raman light, as a function of the average laser intensity. Reductions in the Raman fluence at low laser intensity are attributed to collisional damping. The measured SRS fluence was larger than that predicted from convective amplification of bremsstrahlung noise, as calculated using the average properties of the laser beam and the plasma. Possible contributions to the observed scattering from enhanced noise, Raman scattering within filaments, and the absolute Raman instability at density extrema are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866970
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  • 9
    Electronic Resource
    Electronic Resource
    The limiting configuration of interfacial gravity waves (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 372-375 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Progressive gravity waves at the interface between two unbounded fluids are considered. The flow in each fluid is taken to be potential flow. The problem is converted into a set of integrodifferential equations, reduced to a set of algebraic equations by discretization, and solved by Newton's method together with parameter variation. Meiron and Saffman's [J. Fluid Mech. 129, 213 (1983)] calculations showing the existence of overhanging waves are confirmed. However, the present calculations do not support Saffman and Yuen's [J. Fluid Mech. 123, 459 (1982)] conjecture that the waves are geometrically limited (i.e., that solutions exist until the interface intersects itself). It is proposed that along a solution branch starting with sinusoidal waves of small amplitude, one reaches solutions with vertical streamlines and then overhanging waves. Continuing on this branch, one returns to nonoverhanging waves and then back toward a wave with vertical streamlines. It is suggested that this succession of patterns and accompanying oscillation in wave characteristics is repeated indefinitely. Graphs of the results are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865721
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  • 10
    Electronic Resource
    Electronic Resource
    Small internal waves in two-fluid systems (1989)
    Springer
    Archive for rational mechanics and analysis 108 (1989), S. 111-139 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract This paper treats travelling waves in a heterogeneous, inviscid, non-diffusive fluid bounded between two horizontal boundaries. The fluid has two incompressible components of different, but constant density and is acted on by gravity. The flow is steady when viewed in a moving reference frame and gives rise to a quasilinear elliptic problem with an eigenvalue parameter related to the wave speed. The small amplitude solutions are analyzed using a dynamical systems approach. A center manifold reduction in combination with a conserved quantity for the flow is used to parametrise all ‘small’ solutions of the full elliptic system in terms of solutions of an autonomous first order ordinary differential equation for a principal component of the wave amplitude. The result is a characterization of all small waves, irrotational in each fluid, near the critical speed for the system. They are: solitary waves; surges connecting distinct conjugate flows at extreme ends of the channel; conjugate flows; and periodic waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053459
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