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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear pumped XeBr* fluorescence (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1900-1908 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental and theoretical results are presented on the nuclear pumping of XeBr*. Measurements under 10B and 3He pumping showed fluorescence efficiencies of 1%±0.5% for the B-X emission. Detailed time-dependent kinetic modeling was not in agreement, with predicted efficiencies of order 8%–9%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356981
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental and theoretical studies of nuclear generation of ozone from oxygen and oxygen–sulfur hexafluoride mixtures (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1189-1205 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of experimental measurements of the yield of O3 in nuclear-induced O2 and O2-SF6 discharges are reported. The discharges were created by bombardment with energetic particles from the 10B(n,α)7Li reaction. Continuous irradiation at dose rates of 1015–1017 eV cm−3 s−1 and pulsed irradiation (∼10 ms FWHM) at a peak dose rate of ∼1020 eV cm−3 s−1 were conducted. At the lower dose rates, the addition of SF6 generally increased the ozone yield due to the slowing of ozone destruction by negative oxygen and ozone ions. In contrast, at the high dose rates, the ozone concentration decreased due to SF6 suppression of atomic oxygen formation by ion–ion recombination. A numerical model was developed and tested against experimental conditions. This model indicates that the steady-state ozone concentration was limited by the reaction O−3+O3→2O2+O−2 with a rate coefficient of ∼1×10−12 cm3 s−1. In addition to dose rate effects, pressure and temperature effects on ozone production are discussed and methods for increasing the ozone yield are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337364
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  • 3
    Electronic Resource
    Electronic Resource
    e-beam probe potential diagnostic in spherical electrostatic-inertial plasma confinement (SEIC) (abstract) : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4731-4731 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new e-beam probe is developed to study the potential structure inside a SEIC device [G. H. Miley et al., Fusion Technol. 19, 840 (1991)]. The device has a spherical grid negatively biased inside a spherical vacuum chamber. Ions oscillate through the highly transparent grid, forming a single potential well inside the cathode. The potential in turn attracts electrons from ionization of background gas. The measurement of this complex potential profile is the objective of this work. The e-beam probe offers advantages over the e-emitting probes and the laser heterodyne method. It minimizes perturbations (versus a physical probe) and detects smaller charge density variations than possible with laser techniques. The present e-beam probe utilizes a higher voltage and a modified focus compared to the earlier version used by Swanson [Swanson et al., Phys. Fluids 16, 1939 (1973)]. The characteristic e-beam deflection patterns observed are compared to predictions from an impulse approximation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143622
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  • 4
    Electronic Resource
    Electronic Resource
    Potential profile measurements using a collimated proton detector in spherical inertial-electrostatic plasma confinement : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4810-4812 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A collimated proton detector has been developed for spatial resolved proton measurements in inertial-electrostatic plasma confinement (IEC) fusion experiments. These are the first proton measurements used to infer potential well profiles on an IEC device. This paper describes a new technique for investigating the existence of multiple potential wells inside IEC devices. Analysis of the observed proton energy and source profile indicates that (for a 12-mA cathode current, a 30-kV cathode voltage in a 4-mTorr D2 background) predominantly beam-background fusion occurs. Computer simulation suggests that a positive space charge potential approximately half that of the applied voltage is formed inside the cathode. These results establish the first measurement of a positive potential well structure inside an ion-injected IEC device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143844
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  • 5
    Electronic Resource
    Electronic Resource
    Energy gain calculations in Penning fusion systems using a bounce-averaged Fokker–Planck model (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4547-4560 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In spherical Penning fusion devices, a spherical cloud of electrons, confined in a Penning-like trap, creates the ion-confining electrostatic well. Fusion energy gains for these systems have been calculated in optimistic conditions (i.e., spherically uniform electrostatic well, no collisional ion-electron interactions, single ion species) using a bounce-averaged Fokker–Planck (BAFP) model. Results show that steady-state distributions in which the Maxwellian ion population is dominant correspond to lowest ion recirculation powers (and hence highest fusion energy gains). It is also shown that realistic parabolic-like wells result in better energy gains than square wells, particularly at large well depths (〉100 kV). Operating regimes with fusion power to ion input power ratios (Q-value) 〉100 have been identified. The effect of electron losses on the Q-value has been addressed heuristically using a semianalytic model, indicating that large Q-values are still possible provided that electron particle losses are kept small and well depths are large. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310199
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  • 6
    Electronic Resource
    Electronic Resource
    Quasilinear diffusion modeling of the alpha-loss-cone instability in a tandem-mirror reactor (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2040-2049 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The anisotropic loss-cone distribution of fusion-born alpha particles in a mirror system is capable of destabilizing low-frequency plasma waves. A one-and-one-half-dimensional quasilinear diffusion model is developed to study the nonlinear evolution of the alpha distribution function resulting from enhanced diffusion in velocity space and radial position driven by the unstable Alfvén wave. It is found that pitch-angle scattering of the resonant alphas into the loss cone causes significant losses while radial losses are negligible for a reactor-size plasma. For a typical tandem-mirror reactor, the alpha plasma heating is greatly reduced and ignition in the central cell cannot be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859068
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  • 7
    Electronic Resource
    Electronic Resource
    Coulomb scattering between Maxwellian plasma and monoenergetic beam (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1049-1060 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The use of the theory of generalized function to solve the linearized Fokker–Planck equation for certain special cases is illustrated. As an example, an infinitely extended fusion plasma is considered where the lost particles are continuously refueled by injection of monoenergetic particles perpendicular to the magnetic field lines. The stationary velocity distribution of the injected particles during scattering with a Maxwellian background plasma is calculated. A local solution is presented for the case where the density of the non-Maxwellian component of the distribution is less than ∼10% of the total. Resulting plots of the velocity distribution are presented and the extension of the technique to other situations discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865903
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  • 8
    Electronic Resource
    Electronic Resource
    Alpha loss-cone Alfvén-wave instabilities in a sharp-boundary model of a tandem-mirror central cell (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1656-1672 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Alfvén waves of a cylindrical, sharp-boundary plasma, which models the plasma in a tandem-mirror central cell, have been analyzed for instabilities driven by the loss cone of the alpha-particle distribution function. Improved methods for treating the waves, the distribution function, and the instability have been developed and used. The many normal modes of the cylindrical plasma can be found reliably. The diffusion-front method for calculation of the distribution function allows accurate and rapid computation of instability growth rates and marginal-stability boundaries. Present tandem-mirror reactor designs have densities and temperatures that lead to instability. Consequences of the instability should be assessed by studying the quasilinear evolution of the alpha particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866704
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  • 9
    Electronic Resource
    Electronic Resource
    Tertiary fusion neutron diagnostic for density-radius product and stability of inertial confinement fusion (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 610-615 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The fluence of high-energy (〉14 MeV) "secondary'' neutrons, produced in D–T reactions involving suprathermal fuel ions created by elastic scattering with 14-MeV "primary'' neutrons, yields information about the fuel density-radius product (ρR) and the hydrodynamic stability of inertial-confinement fusion (ICF) targets. The suprathermal ions, produced in proportion to the fuel ρR, create secondary neutrons with energies ≤30 MeV when fusing with a thermal ion. The ratio of secondary to primary neutrons determines the mean fuel ρR. Since secondary neutrons, which are mainly formed near the fuel tamper interface with energies 〉24 MeV, are radially directed, the detection of their angular distribution provides a unique measurement of the deviation from spherical geometry of the fuel ρR. Valid for fuel ρR〉0.1 g/cm2 and D–T yield above 1014, this diagnostic would be valuable in upcoming ICF experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139842
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  • 10
    Electronic Resource
    Electronic Resource
    Fiber sensor neutron streak camera for ICF diagnostics (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1746-1748 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We propose a new neutron streak camera design for ICF burn studies. It uses a fiber-optic sensor so that the camera itself can be removed from the target chamber. The sensor element is based on the decreased optical transmission (darkening) of a fiber optics doped with fissile material during neutron irradiation. The velocity spread of the neutron pulse requires positioning of any neutron sensor within 5 cm from the target in order to resolve the burn dynamics. A major advantage over other designs is that sensitive and costly components are removed from the intense radiation field. Estimates of minimum yield requirements, darkening time response, and overall temporal resolution are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139169
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