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  • 1
    Electronic Resource
    Electronic Resource
    A model for energetic ion generation in an anode plasma (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3399-3407 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mechanisms for energetic ion generation that could explain the observed ion energies in the anode plasma of a magnetically insulated ion diode [Phys. Rev. A 39, 5842 (1989)], are discussed. It is suggested that strong electric fields that result from large density gradients on few tens of micrometers near the anode cause the ion acceleration. Steady state as well as time-dependent accelerations are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860633
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  • 2
    Electronic Resource
    Electronic Resource
    Space-charge-limited ion flow through an ionizing neutral layer (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3408-3416 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Space-charge-limited ion flow through an ionizing layer of neutral atoms is studied. The ion flow is between two parallel conducting plates (anode and cathode) with an externally applied voltage between them. An expanding layer of neutral atoms is adjacent to the anode surface, extending a finite distance into the anode–cathode gap. All ions originate either from the anode surface or from the ionization of neutrals; electrons originate only from ionization. Electrons are strongly magnetized by an externally applied, time-independent direct current (dc) magnetic field directed across the ion flow. The ions are unmagnetized, all motion being perpendicular to the conducting plates. Two different models of the anode layer were used to analyze this problem: a multifluid steady-state model and a single fluid time-dependent model. From both models it was found that the anode surface becomes shielded after the ion flux from the ionizing layer becomes larger than the space-charge-limited flux of the reduced gap between the neutral layer and cathode. Comparison was made between the time-dependent model and results from magnetically insulated ion beam diode (MID) experiments. Using an initial areal density of neutral hydrogen and carbon equal to the final observed electron areal density, comparison was made between calculated plasma shielding times and upper bounds on the shielding time observed in experiments. It was found that a layer of neutral hydrogen must contain a minimum of 15% carbon (by number density) to explain the rapid electric field screening observed in experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860634
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quasilinear diffusion in stochastic magnetic fields: Reconciliation of drift-orbit modification calculations (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1160-1163 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An apparent difference between two calculations of drift-orbit modifications to the spatial diffusion rate of particles in stochastic magnetic fields is addressed [H. E. Mynick and J. A. Krommes, Phys. Rev. Lett. 43, 1506 (1979); J. R. Myra and P. J. Catto, Phys. Fluids B 4, 176 (1992)]. The calculations are reconciled by noting the relevance of an inequality which was not discussed in these studies. It is shown, both analytically and by Monte Carlo simulation, that the diffusion coefficient can be sensitive to the spectral width of the magnetic turbulence relative to a finite Larmor radius parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860906
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: "A unified theory of tokamak transport via the generalized Balescu–Lenard collision operator'' [Phys. Fluids B 1, 750 (1989)] (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1758-1758 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859212
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  • 5
    Electronic Resource
    Electronic Resource
    A unified theory of tokamak transport via the generalized Balescu–Lenard collision operator (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 750-765 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A unified basis from which to study the transport of tokamaks at low collisionality is provided by specializing the "generalized Balescu–Lenard'' collision operator to toroidal geometry. Explicitly evaluating this operator, ripple, turbulent, and neoclassical transport coefficients are obtained, simply by further specializing the single operator to different particular classes of fluctuation wavelength and mode structure. For each class of fluctuations, the operator possesses a diffusive, test-particle contribution D, and in addition a dynamic drag term F, which makes the operator self-consistent, and whose presence is accordingly essential for the resultant fluxes to possess the appropriate conservation laws and symmetries. These properties, well known for axisymmetric transport, are demonstrated for one type of turbulent transport, chosen for definiteness, by explicit evaluation of both the "anomalous diffusion'' term arising from D, as well as the closely related "anomalous pinch'' term coming from F. The latter term is neglected by test-particle calculations, but is shown to have an important impact on the predicted fluxes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859140
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    MeV ion confinement in the TFTR tokamak (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 1411-1414 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper the confinement of the MeV ions that are created by D–D reactions in the TFTR tokamak [in Plasma Physics and Controlled Nuclear Fusion Research 1988 (IAEA, Vienna, 1989), Vol. 1, p. 27] is described. The ions that escape from the plasma are measured by a new type of detector located just outside the plasma edge. Most measurements made with this detector are consistent with the first-orbit loss of these ions. Exceptions are correlated with strong magnetohydrodynamic activity, and a preliminary explanation is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859565
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Visible-light spectroscopy of pulsed-power plasmas (invited) : 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. 5127-5131 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe the investigations of the plasma behavior in three pulsed-power systems: a magnetically insulated ion diode, and plasma opening switch, and a gas-puffed Z pinch. Recently developed spectroscopic diagnostic techniques allow for measurements with relatively high spectral, temporal, and spatial resolutions. The particle velocity and density distributions within a few tens of microns from the dielectric-anode surface are observed using laser spectroscopy. Fluctuating electric fields in the plasma are inferred from anisotropic Stark broadening. For the plasma opening switch experiment, a novel gaseous plasma source was developed which is mounted inside the high-voltage inner conductor. The properties of this source, together with spectroscopic observations of the electron density and particle velocities of the injected plasma, are described. Emission line intensities during the switch operation are discussed. In the Z-pinch experiment, spectral emission-line profiles of various charge-state ions are studied during the implosion phase. Radial velocity distributions are observed from the line Doppler shifts and widths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143461
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    Paper (German National Licenses)
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