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  • 1
    Electronic Resource
    Electronic Resource
    Large-area 200-ps gated microchannel plate detector (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2046-2048 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Results are presented with a 15-mm-wide gated microchannel plate UV and x-ray detector. The active area is part of a 6-Ω transmission line driven by an electronically generated gate pulse. The microchannel plate is coated with CsI allowing tests with a frequency-quadrupoled, high-repetition-rate 1.05-μm laser. Results showing optical gate widths as short as 100 ps are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138785
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of x-ray switching and shuttering techniques (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2168-2170 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Experimental studies have been conducted on the changes in x-ray diffraction properties of crystals under intense subnanosecond laser heating. One beam of the PHOENIX laser system was used to create an intense source of x-ray line radiation. This radiation was, in turn, diffracted from a silicon crystal that was heated with the other beam of the laser. The diffracted radiation was temporally resolved with an x-ray streak camera. The diffracted lines are observed to broaden on a subnanosecond time scale. From the temporal structure of the diffracted radiation, information is derived on the nature of the laser heating process. We show that such interruption of the diffracting process is a potentially useful mechanism for x-ray switching and shuttering. Considerations for the design and construction of such devices are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138719
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Toroidally curved crystal for time-resolved x-ray spectroscopy (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 803-805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A toroidally bent crystal for producing a focused spectrum normal to the line of sight from a laser plasma is described. Experimental results using a pentaerythritol crystal are described which show a brightness gain of 50 over a flat crystal. Improvement in the resolution of dielectronic satellites to the heliumlike 1s2-1s3p, 1s2-1s4p, and 1s2-1s5p lines of silicon is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138178
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Synchronous time-resolved optical and x-ray emission from simultaneous optical and x-ray streak cameras driven by a master ramp generator (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 860-861 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An optical and an x-ray streak camera have been synchronized by driving the deflection plates of both cameras from the same ramp generator. The relative timing of the two cameras was calibrated by running UV light onto the x-ray streak camera. The x-ray streak camera was then used to measure the time of the x-ray emission from a laser plasma with respect to the laser pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138073
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Four-frame gated optical imager with 120-ps resolution (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1457-1460 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article we describe the operation and applications of a framing camera capable of four separate two-dimensional images with each frame having a 120-ps gate width. Fast gating of a single frame is accomplished by using a wafer image intensifier tube in which the cathode is capacitively coupled to an external electrode placed outside of the photocathode of the tube. This electrode is then pulsed relative to the microchannel plate by a narrow (120-ps), high-voltage pulse. Multiple frames are obtained by using multiple gated tubes which share a single bias supply and pulser with relative gate times selected by the cable lengths between the tubes and the pulser. A beam-splitter system has been constructed which produces a separate image for each tube from a single scene. Applications of the framing camera to inertial confinement fusion experiments are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139687
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  • 6
    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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    Paper (German National Licenses)
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  • 7
    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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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of a high-magnification x-ray microscope on Nova (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1852-1852 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have implemented a Wolter-type x-ray optic in a high- (22×) magnification microscope on Nova. We report on the on-line characterization of this system and show results from the several types of experiments performed. The point spread function, contrast transfer function at selected spatial frequencies, x-ray throughput, alignment accuracy, and field of view have all been measured as configured for Nova experiments. Such characterization may be used to remove the degradation introduced by the instrument. 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/10.1063/1.1140085
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Absolute measurements of the equations of state of low-Z materials in the multi-Mbar regime using laser-driven shocks (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1857-1861 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Although high intensity lasers offer the opportunity to explore the equations of state (EOSs) of materials under high energy density conditions, experimental difficulties have limited the application of laser-driven shocks to EOS measurements. However, we have recently performed absolute EOS measurements on the principal Hugoniot of liquid deuterium near one Mbar and of polystyrene from 10 to 40 Mbar. The D2 measurements were made with direct drive; the polystyrene experiments were indirectly driven. The data were sufficiently accurate to differentiate between existing EOS models and were surprising, particularly for D2. The results demonstrate that laser driven shocks can be used effectively to investigate high pressure EOSs. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872362
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    X-ray radiographic imaging of hydrodynamic phenomena in radiation-driven materials—Shock propagation, material compression, and shear flowf| (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1662-1668 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: One- and two-dimensional, time-resolved x-ray radiographic imaging at high photon energy (5–7 keV) is used to study shock propagation, material motion and compression, and the effects of shear flow in solid density samples which are driven by x-ray ablation with the Nova laser. By backlighting the samples with x rays and observing the increase in sample areal density due to shock compression, the trajectories of strong shocks (∼40 Mbars) in flight are directly measured in solid density plastic samples. Doping a section of the samples with high-Z material (Br) provides radiographic contrast, allowing a measurement of the shock-induced particle motion. Instability growth due to shear flow at an interface is investigated by imbedding a metal wire in a cylindrical plastic sample and launching a shock in the axial direction. Time-resolved radiographic measurements are made with either a slit-imager coupled to an x-ray streak camera or a pinhole camera coupled to a gated microchannel plate detector, providing ∼10 μm spatial and ∼100 ps temporal resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870668
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