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  • 11
    Electronic Resource
    Electronic Resource
    J×B heating by very intense laser light (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 430-432 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plasma heating by the oscillating component of the pondermotive force of a very intense light wave is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865171
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  • 12
    Electronic Resource
    Electronic Resource
    Reply to the comments of Sinha and Gupta (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1512-1512 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a recent Comment, theoretical estimates of the density scale length in a laser-produced plasma were compared with some experimental observations. It is noted that many assumptions of the ideal model are not satisfied for the experiments with 5 nsec pulses of 1.06 μm light. It is also noted that the model predicts a local profile modification near the critical density which can be difficult to resolve in some experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859722
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  • 13
    Electronic Resource
    Electronic Resource
    Erratum: "Narrow Raman spectra: The competition between collisional and Landau damping'' [Phys. Fluids B 1, 2217 (1989)] (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1709-1709 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859589
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  • 14
    Electronic Resource
    Electronic Resource
    Narrow Raman spectra: The competition between collisional and Landau damping (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2217-2223 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Narrow Raman spectra can be produced when the collisional damping rate becomes comparable to the homogeneous growth rate for stimulated Raman scattering (SRS). Landau damping limits the SRS spectrum at short wavelength, and collisional damping can limit it at long wavelength through the variation of the damping rate with plasma density. Data are shown to demonstrate this effect for the first time, from experiments in which constant-intensity pulses of 0.35 μm light irradiated 3 μm thick CH targets at intensities up to 2×1014 W/cm2. The observed spectra have a peak wavelength, spectral width, spectral shape, and shift of the peak in time that are consistent with the anticipated effects of damping. Reduction of the emission from the plasma to near thermal levels at heavily damped frequencies is also demonstrated. In addition, the application of two specific models of SRS to these data is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859037
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  • 15
    Electronic Resource
    Electronic Resource
    Laser-intensity scaling experiments in long-scalelength, laser-produced plasmas (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1795-1802 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental technique is demonstrated that allows variation of the average laser intensity by more than two orders of magnitude while producing much smaller changes in the other parameters that determine the laser–plasma interactions. By irradiating exploding-foil targets with 0.35 μm laser light in flat-topped pulses of variable duration, the high-power Nova laser [Rev. Sci. Instrum. 57, 2101 (1986)] produced plasmas with electron temperatures of order 1 keV and with scale lengths of the (radial and axial) electron-density gradients of order 1000 laser wavelengths. By using a constant target thickness and systematically decreasing the pulse length and spot size as laser intensity increased, the changes in the temperature and in the scale lengths were minimized. The time-resolved spectrum of the Raman-scattered light was used to measure both the electron temperature and the maximum density of the expanding plasmas. In this paper, these measurements are compared to both 1-D models and 2-D simulations. The expected trends of slower burnthrough and lower temperature with lower laser intensity were observed. However, the inferred temperatures are lower and the burnthrough of the target (at high laser intensities) is slower than the modeling predicts. Possible sources of these discrepancies are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866669
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  • 16
    Electronic Resource
    Electronic Resource
    Superthermal electron production from hot underdense plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3825-3831 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very-high-energy electrons of up to an energy of ∼2.3 MeV have been observed to be emitted from the hot underdense exploding thin foil plasmas created by 10.6 μm CO2 laser radiation at intensity levels up to ∼4×1014 W/cm2. As a supplement to the electron measurements the forward and backward scattered light components were also measured. Correlation of these measurements shows that either Raman scattering or the high-temperature version of two-plasmon decay or both, manifesting themselves near the quarter-critical density region, are responsible for the production of a hot (Th∼135 keV) tail of electrons at least up to energies of 1 MeV. There are no indications that the Raman forward scattering (as distinct from Raman backward scattering) at lower densities plays any significant role. These experimental results are consistent with the results from a l 1/2 -dimensional particle-in-cell code simulation with a parabolic density profile resembling the experimental conditions. An apparent anomaly is discussed, which is that hot electrons are produced (both in experiments and simulations) at energies higher than the trapping value appropriate to electron plasma waves whose phase velocity is equal to the matching value (C/(3)1/2) at the turning point for the light of half the laser frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866420
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  • 17
    Electronic Resource
    Electronic Resource
    Time resolved Thomson scattering measurements of the electron and ion temperatures in a high intensity laser–plasma interaction (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3616-3623 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time resolved Thomson scattering from thermal plasma fluctuations is used to measure the electron and ion temperatures in the interaction of a short pulse (1 nsec FWHM), high intensity (∼2×1014 W/cm2) CO2 laser beam with a preformed carbon plasma. Time histories of the plasma temperatures with a temporal resolution of ∼150 psec were obtained in a single irradiation/discharge event by streaking the Thomson scattering spectrum. The experimentally measured electron temperature was found to be lower than that predicted by computer simulations. The discrepancy is attributed mainly to a decrease in the inverse bremsstrahlung absorption coefficient at high laser intensities (vosc/ve〉1) .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866443
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  • 18
    Electronic Resource
    Electronic Resource
    Beat-wave heating with density profile steepening (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3493-3494 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron heating by the beat between 0.53 and 1.06 μm light in a self-consistently steepened density profile is examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865822
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  • 19
    Electronic Resource
    Electronic Resource
    Near-forward scattering of laser lightf| (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2596-2602 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Near-forward scattering of laser light in a plasma, in regimes relevant to future inertial-confinement-fusion (ICF) experiments, has been investigated experimentally. The intensity scaling of stimulated Raman scattering (SRS) forward scattering at one angle was measured from a low-Z plasma. It was found that the intensity threshold and scaling were consistent with convective theory. Forward SRS saturated at a relatively low intensity. In a second experiment using Ti plasmas, absolutely calibrated, time-resolved stimulated Brillouin scattering (SBS) spectra from up to seven different angles were measured simultaneously. It was found that the angular dependence of the scattered energy was qualitatively consistent with convective theory. The spectra provided the first evidence of near-forward SBS. Contrary to previous estimates, near-forward SBS was shown to be more efficient than oblique backscattering and may be an important effect for ICF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860696
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  • 20
    Electronic Resource
    Electronic Resource
    Production of very large, sub-tenth-critical plasmas for laser-fusion research (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2898-2905 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The development of a plasma environment that is appropriate for the study of low-gain processes in laser-fusion plasmas is reported. These plasmas have long scale lengths, low densities, and no quarter-critical or critical-density surfaces. The plasmas were created by two-sided irradiation of CH foils with 15 kJ of 351 nm laser light. When the peak electron density in the plasma had decayed to about 2×1020 cm−3, the parabolic density profile was estimated to have a full width at half-maximum of 3 mm and the electron temperature was estimated to be 1 keV. Probe lasers of different wavelengths were used to measure the peak electron density via stimulated scattering processes and odd half-harmonic generation. Sufficiently accurate modeling of the laser-irradiation conditions led to improved agreement between the experiment and two-dimensional (2-D) computer simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859923
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