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  • 1
    Electronic Resource
    Electronic Resource
    A passive method to trap an electron beam in a stellatron accelerator (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1151-1157 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An electron beam can be trapped in a stellatron accelerator with a passive technique by dissipating the energy associated with the poloidal displacement of the beam from its equilibrium position. If the net force on the beam is directed toward the minor center of the vacuum chamber, the beam will spiral toward its equilibrium position. The beam dissipates energy by charging and discharging a conductor that is grounded through a resistor. Numerical solutions in the paraxial approximation illustrate this capture effect, with parameters that show a large enough effect to trap a beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347296
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  • 2
    Electronic Resource
    Electronic Resource
    The Nike KrF laser facility: Performance and initial target experiments (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2098-2107 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Krypton-fluoride (KrF) lasers are of interest to laser fusion because they have both the large bandwidth capability ((approximately-greater-than)THz) desired for rapid beam smoothing and the short laser wavelength (1/4 μm) needed for good laser–target coupling. Nike is a recently completed 56-beam KrF laser and target facility at the Naval Research Laboratory. Because of its bandwidth of 1 THz FWHM (full width at half-maximum), Nike produces more uniform focal distributions than any other high-energy ultraviolet laser. Nike was designed to study the hydrodynamic instability of ablatively accelerated planar targets. First results show that Nike has spatially uniform ablation pressures (Δp/p〈2%). Targets have been accelerated for distances sufficient to study hydrodynamic instability while maintaining good planarity. In this review we present the performance of the Nike laser in producing uniform illumination, and its performance in correspondingly uniform acceleration of targets. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871661
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  • 3
    Electronic Resource
    Electronic Resource
    Transition of a tokamak plasma from a state with low- to high-poloidal beta (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 4119-4122 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A non-flux-conserving transition of tokamak plasma from a state with low-poloidal beta to a state with high-poloidal beta is reported, using data obtained from the Columbia high-beta tokamak machine [Nucl. Fusion 25, 1109 (1985)]. The plasma survives the transition without any low-mode number kink instability or disruption, possibly because of an increasing plasma safety factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865755
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  • 4
    Electronic Resource
    Electronic Resource
    Plasma formation and equilibrium in a high β tokamak (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2527-2537 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation and equilibrium of a high β tokamak in the Columbia High Beta Tokamak (HBT) (Plasma Physics and Controlled Nuclear Fusion Research 1986, in press) is documented using magnetic probes as the principle diagnostic. The formation from a toriodal field stabilized Z pinch is simulated with 2-D resistive magnetohydrodynamic (MHD) equations. From the measurement of the magnetic field by high-impedence internal magnetic probes, the poloidal flux, toroidal current, and safety factor are calculated. In addition, the plasma position and cross-sectional shape are determined. The tokamak has a major radius of about 0.24 m, a minor radius of about 0.05 m, and a toroidal current density of about 106 A/m2. The high β tokamak plasma is observed to have an outward shift in major radius of both the magnetic center and the peak of the toroidal current density. The magnetic center moves inward in major radius after 20–30 μsec, presumably because the plasma maintains major radial equilibrium as its pressure decreases because of the radiation of impurity atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866091
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of glass fluorescers used to measure a pulsed ultraviolet image at F/2 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1993-1998 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We built and characterized an instrument to measure the output profile of a pulsed KrF laser. The laser beam is focused onto a ∼1-mm-thick fluorescer, and the resulting fluorescence is imaged by a charge coupled device (CCD) camera. We tested 21 materials for efficiency, linearity, and fidelity. The best material is Schott BG-26 color filter glass. It has acceptable linearity for a fluence of 50 mJ/cm2, and a spatial resolution of ∼50 μm with a laser convergence angle of 30° (F/2), when the fluorescence is imaged with F/3 optics. We present a list of the materials tested and comparisons of profiles measured by using the fluorescer and by direct recording with a CCD camera. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1353195
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  • 6
    Electronic Resource
    Electronic Resource
    The NIKE KrF laser fusion facility (1991)
    Springer
    Journal of fusion energy 10 (1991), S. 301-303 
    Details
    ISSN: 1572-9591
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract NIKE is a second generation high power KrF laser now under construction at the Naval Research Laboratory. The project is a collaborative effort between NRL and Los Alamos National Laboratory. NIKE is designed to deliver more than 2 kJ of energy to target in a 600-μm focal spot and a 4-ns pulse duration. Echelon free induced spatial incoherence (ISI) will be used to produce uniform target illumination. Flat targets will be ablatively accelerated to study both Rayleigh-Taylor and parametric instabilities. These results will have direct implications to direct-drive inertial confinement fusion for commercial energy applications. Reliable operation of a high power KrF laser is also an important goal of the NIKE laser, with the objective of 1000 target shots per year. This would be an important step in the development of the KrF laser as an ICF driver. NIKE is cheduled to begin target experiments in early 1994. If successful, these experiments will provide a technical basis to proceed with construction of an ignition facility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052128
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