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  • 1985-1989  (25)
  • 1
    Electronic Resource
    Electronic Resource
    Study of Hc enhancement in Co-modified γ-Fe2O3 films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3883-3885 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties and depth profiles of Co-modified γ-Fe2O3 films have been studied. The Hc of these films varies between 0.3 and 2.5 kOe nonmonotonically with Co concentration and depends only slightly on temperature. The non-diffusion-like Co-rich layer that appears underneath the surface of the Fe-oxide films displaying an enhanced Hc has been positively demonstrated to be responsible for the Hc enhancement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338597
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  • 2
    Electronic Resource
    Electronic Resource
    Hot-electron ring formation in tokamak plasmas (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 507-511 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Energetic particles of tokamak plasmas may be preferentially heated by the second harmonic X mode. Their orbits collapse toward the low magnetic field side, where the resonance layer is placed, until the relativistic detuning moves the resonance layer outside the particle orbit. The time evolution of the heating process and the ring structure are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865437
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  • 3
    Electronic Resource
    Electronic Resource
    Consequence of filamentation on stimulated Raman scattering (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 4188-4191 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a plasma with long density scale length, a laser beam breaks up into a number of filaments, each having a size a∼c/ωp. The process of stimulated Raman scattering in these filaments involves a backscattered light wave of radial extent ∼a and a Langmuir wave of extent b∼(aλD)1/2(very-much-less-than)a. The strong localization of the interaction region tends to severely suppress the growth rate. However, the filamentation-induced enhancement of pump intensity opposes this effect. At power densities of a few times 1014 W/cm2 at 1 μ filamentation does not seem to have a strong effect on stimulated Raman scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865710
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  • 4
    Electronic Resource
    Electronic Resource
    Radiation guiding in a free electron laser (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 221-229 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Analytic solutions of radially localized eigenmodes of radiation in Compton regime free electron lasers are obtained to demonstrate the radiation guiding property of the electron beam. The radial width of the radiation field Rs is found to be related to the beam radius Rb by Rs∼Rbp1/6, where p=(c/Rb)3/β0ωp0ω20, in a cold beam approximation. Here β0c, ωp0, and ω0 are the electron quivering velocity resulting from the pump, the equilibrium beam plasma frequency on the beam axis, and the pump wave frequency, respectively, in the electron beam rest frame. Finite temperature effects, curvature effects, and transverse motional effects of the beam are also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859094
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  • 5
    Electronic Resource
    Electronic Resource
    Collisionless electron temperature gradient instability (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 1331-1339 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of electron temperature gradient driven modes in a collisionless plasma with magnetic shear has been studied. Two coupled integral equations for the electrostatic and vector potentials have been solved numerically. The properties of these modes derived on the basis of numerical investigation have been utilized to estimate the anomalous electron transport induced by them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866248
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  • 6
    Electronic Resource
    Electronic Resource
    Half-coalescence ideal magnetohydrodynamic instability of the q=1 magnetic island in tokamaks (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1585-1588 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ideal magnetohydrodynamic instability of a symmetric q=1 magnetic island is studied by using an initial value method for a pressureless cylindrical tokamak plasma. It is shown that the island is unstable to a half-coalescence motion which destroys the up–down symmetry of the magnetic configuration. The mode characteristics are qualitatively similar to those predicted by Bussac et al. [Phys. Lett. 105A, 51 (1984)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864948
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  • 7
    Electronic Resource
    Electronic Resource
    Erratum: "Radiation guiding in a free electron laser'' [Phys. Fluids B 1, 221 (1989)] (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1144-1144 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859211
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  • 8
    Electronic Resource
    Electronic Resource
    Sideband excitation in an electromagnetic wiggler pumped free electron laser (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3799-3803 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A kinetic formalism of sideband excitation at the multiples of bounce and cyclotron frequencies of electrons trapped in the ponderomotive potential well and a guide field is developed. A positive (negative) slope of the distribution function with parallel energy is necessary for the excitation of upper (lower) sidebands of the bounce frequency. The cyclotron harmonic sideband excitation requires large perpendicular energy; the latter, however, tends to lower the growth rate of bounce harmonic sidebands. In either case the growth rate falls off rapidly with the harmonic number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866847
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  • 9
    Electronic Resource
    Electronic Resource
    Modification of lower-hybrid current ramp-up by runaways (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1900-1907 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Runaway effects on lower-hybrid current ramp-up are studied numerically using a two-dimensional Fokker–Planck analysis and a nonlinear circuit equation. Runaway contribution to the inductance is shown to be important in limiting the magnitude of the induced electric field. This tends to reduce the current ramp-up efficiency. However, for a range of ωp/Ω, the anomalous Doppler instability can be excited and the runaway production rate as well as the associated inductance is significantly reduced when that happens. This allows the ramp-up efficiency to be further increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866007
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  • 10
    Electronic Resource
    Electronic Resource
    A simple model for lower-hybrid current drive in tokamaks (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1148-1154 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of scattering by density fluctuations on the single pass lower-hybrid propagation in tokamaks for current drive are analyzed in a cylindrical plasma model with sheared magnetic field. Even for the launched N(parallel) spectrum peaked around 2, the turbulent scattering and propagation in the sheared field significantly modifies the N(parallel) spectrum so that the waves can effectively couple to slower electrons. At low densities, a small amount of the incident energy experiences a large N(parallel) upshift and creates a high-energy electron tail which interacts with the main part of the wave energy. At higher densities, the bulk of the wave energy is shifted in N(parallel) before damping resulting in lower current drive efficiencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865038
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