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  • American Institute of Physics (AIP)  (6)
Collection
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Years
  • 1
    Electronic Resource
    Electronic Resource
    Direct-drive laser-fusion experiments with the OMEGA, 60-beam, 〉40 kJ, ultraviolet laser system (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2108-2112 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: OMEGA, a 60-beam, 351 nm, Nd:glass laser with an on-target energy capability of more than 40 kJ, is a flexible facility that can be used for both direct- and indirect-drive targets and is designed to ultimately achieve irradiation uniformity of 1% on direct-drive capsules with shaped laser pulses (dynamic range (approximately-greater-than)400:1). The OMEGA program for the next five years includes plasma physics experiments to investigate laser–matter interaction physics at temperatures, densities, and scale lengths approaching those of direct-drive capsules designed for the 1.8 MJ National Ignition Facility (NIF); experiments to characterize and mitigate the deleterious effects of hydrodynamic instabilities; and implosion experiments with capsules that are hydrodynamically equivalent to high-gain, direct-drive capsules. Details are presented of the OMEGA direct-drive experimental program and initial data from direct-drive implosion experiments that have achieved the highest thermonuclear yield (1014 DT neutrons) and yield efficiency (1% of scientific breakeven) ever attained in laser-fusion experiments. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871662
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  • 2
    Electronic Resource
    Electronic Resource
    Reduction of 3ω0/2 emission from laser-produced plasmas with broad bandwidth, induced spatial incoherence at 0.53 μm (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1479-1484 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the 3ω0/2 emission from laser-irradiated targets at 0.53 μm were made at three angles over a wide range of laser bandwidths with and without induced spatial incoherence (ISI) echelons. The 3ω0/2 emission was found to be correlated with hard x rays but not Raman spectra, suggesting that the 3ω0/2 radiation was due to two-plasmon decay. Reduction of both 3ω0/2 emission and the accompanying hard x rays by ISI required five to ten times larger bandwidths than needed to suppress stimulated Raman scattering and stimulated Brillouin scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859715
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  • 3
    Electronic Resource
    Electronic Resource
    Increased x-ray conversion efficiency from gold plasmas irradiated with spatially and temporally incoherent light (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1496-1500 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The efficiency with which 1.05 μm laser light is converted into x rays with energy less than 1.5 keV in high Z materials (gold) is increased by approximately 20% with the use of spatially and temporally incoherent light when compared to a nominal, high-powered laser beam with an identical average irradiance of 1014 W/cm2. This effect is not a result of increased laser light absorption, laser bandwidth, nor reduced hot electron generation for the incoherent light, but is probably due to the change in the short scale length (∼100 μm) laser light intensity distribution in the target plane. The absolute levels of stimulated scattering and hot electron generation were small in all cases. Incoherent illumination reduced stimulated Brillouin scattering levels from 1.1% to 0.2% and, similarly, hot electron generation was decreased from 0.1% to 0.07%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859717
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  • 4
    Electronic Resource
    Electronic Resource
    Laser interaction in long-scale-length plasmas (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1305-1320 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Absorption of a short-pulse, high-intensity Nd-laser beam (vacuum irradiance of 1014 to 1015 W/cm2) by preformed plasmas of different density scale lengths is investigated. Increased effects of plasma instabilities are found at longer scale lengths. The amount of backscattered light increases with plasma scale length and limits the absorption fraction at the longest scale length. The onset of suprathermal electron production, deduced from observations of energetic (20 to 50 keV) x rays, occurs at lower laser irradiance for longer-scale-length plasmas. A correlation between energetic x rays and 3ω0/2 emission suggests that the suprathermal electrons are produced by a plasma instability at quarter-critical density. At higher intensities there is evidence for severe perturbations of the preformed plasma and for self-focusing of the incident beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865880
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  • 5
    Electronic Resource
    Electronic Resource
    Time-resolved, simultaneous density, temperature, and absorption measurements in dense laser-produced plasmas (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3596-3599 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an optical diagnostic setup which permits simultaneous spatially and temporally resolved measurements of temperature and density from cold, dense laser-produced plasmas. Such information is necessary to investigate the physics of strongly coupled plasmas. The plasma is created in a slab geometry such that the transverse slab dimension is approximately one optical depth of the probing radiation in thickness. To perform the measurements the 2nd harmonic (λ=0.527 μm) of a mode-locked Nd:glass laser (τpulse=300–500 ps) is split into two orthogonally polarized beams. One of the beams measures plasma electron density using polarization wave front interferometry. The other beam uses a set of fast (τ=350 ps) photodiodes to measure single-frequency optical absorption. Plasma electron temperature is determined from time-resolved absolute emission measurements combined with the optical absorption measurements via Kirchoff's law. This technique avoids the difficulties involved in spectroscopic temperature measurements, where the spectral intensities and line profiles are affected by the physics of the cold, dense plasma. A set of timing fiducials allows the entire set of diagnostics to be synchronized in time, while an accurate, self-referenced alignment system assures that all diagnostics sample the same region of plasma volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141577
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  • 6
    Electronic Resource
    Electronic Resource
    Time-resolved, simultaneous density, temperature, and absorption measurements in dense laser-produced plasmas (abstract) : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2985-2985 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an optical diagnostic setup which permits simultaneous spatially and temporally resolved measurements of temperature and density from cold, dense laser-produced plasmas. Such information is necessary to investigate the physics of strongly coupled plasmas. The plasma is created in a slab geometry such that the transverse slab dimension is approximately one optical depth of the probing radiation in thickness. To perform the measurements the 2nd harmonic (λ=0.527 μm) of a mode-locked Nd:glass laser (τpulse=300–500 ps) is split into two orthogonally polarized beams. One of the beams measures plasma electron density using polarization wave front interferometry. The other beam uses a set of fast (τ=350 ps) photodiodes to measure single-frequency optical absorption. Plasma electron temperature is determined from time-resolved absolute emission measurements combined with the optical absorption measurements via Kirchoff's law. This technique avoids the difficulties involved in spectroscopic temperature measurements, where the spectral intensities and line profiles are affected by the physics of the cold, dense plasma. A set of timing fiducials allows the entire set of diagnostics to be synchronized in time, while an accurate, self-referenced alignment system assures that all diagnostics sample the same region of plasma volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141749
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