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  • American Institute of Physics (AIP)  (9,958)
  • American Physical Society (APS)
  • MDPI Publishing
  • 2010-2014
  • 1995-1999
  • 1990-1994  (9,958)
  • 1985-1989
  • 1994  (9,958)
Collection
Publisher
Years
  • 2010-2014
  • 1995-1999
  • 1990-1994  (9,958)
  • 1985-1989
Year
  • 1
    Electronic Resource
    Electronic Resource
    Multiple double layers in a glow discharge (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2441-2447 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of visible layered structures that develop at the anodic zone of a constricted glow discharge is reported. They are composed of several tridimensional double layers with axial symmetry enclosing different plasma coronas. The dependence of the number and size of plasma shells with the conditions of the discharge is discussed, as well as the nature of these double layers. The experimental results evidence the effect of the distribution of neutrals in the volume of the discharge for the development of double layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870572
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  • 2
    Electronic Resource
    Electronic Resource
    Fast decay of plasma return currents due to whistler waves (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2480-2487 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolution of the return current induced by a charged particle beam in a magnetized plasma is studied. The beam current is perpendicular to the background magnetic field. The return current is shown to depart from the beam along the background magnetic field with a whistler rather than a diffusion or an Alfvén velocity. In a plasma bounded by two conductors the return current oscillates with the whistler period. Analytical expressions for the evolution of the magnetic field and of the plasma return current are derived for a beam with a finite width and with various rise time dependences. When the whistler time is shorter than the rise time of the beam current, the plasma return current does not grow beyond the whistler time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870576
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  • 3
    Electronic Resource
    Electronic Resource
    Relaxation of a nonideal magnetohydrodynamic plasma in a cylindrical column (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2525-2530 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The time evolution of a nonideal magnetohydrodynamic (MHD) plasma is investigated. An approach for the reduction of the nonlinear vector MHD equations for a current carrying plasma with a strong longitudinal external magnetic field to a set of scalar partial differential equations is supposed. Analytical time-dependent solutions of the nonlinear resistive and dissipative MHD equations for a cylindrical plasma column are presented. It is shown that the internal magnetic field and the velocity have different damping times and that in the asymptotic limit t→∞ the plasma slowly relaxes toward the static equilibrium state. Analytical reduced MHD solutions describing slowly evolving states in tokamaks are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870580
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  • 4
    Electronic Resource
    Electronic Resource
    Plasma kinetic effects in stochastic helical field (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2566-2573 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The kinetic equation for a plasma in a stochastic electromagnetic helical field is constructed and studied. The kinetic equation contains an additional term, proportional to the helicity. The evolution of the main moments of the distribution function is considered. A solution describing the evolution of the distribution function for arbitrary initial conditions is found and possible consequences of presence of the helicity term are discussed. A model example is considered when a single-momentum electron beam with an inhomogeneous velocity profile creates a new particle flow in the transverse direction, so that the resulting flow also possesses the helicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870584
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  • 5
    Electronic Resource
    Electronic Resource
    Monte Carlo approach to collisional transport (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2603-2613 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A linearized discretization approach is proposed for the numerical investigation of the gyrokinetic equation describing the dynamics of a strongly rotating plasma in a toroidally axisymmetric configuration. The discretization scheme allows the numerical evaluation of the neoclassical transport matrix in terms of a suitably discretized distribution function. A basic feature of the discretization scheme here developed is that it permits the introduction of Monte Carlo collision operators to advance in time the gyrokinetic state of a suitable set of test particles. Such operators, which apply to general non-normal gyrokinetic coordinates, are constructed in such a way as to conserve exactly the collisional invariants. A fundamental consequence is that the neoclassical transport coefficients determined in this way fulfill exactly both Onsager's symmetry relations and the condition of strict ambipolarity for the particle-flux transport coefficients. Such properties are proven to be satisfied independently of the number of test particles used in the discretization scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870587
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  • 6
    Electronic Resource
    Electronic Resource
    Far field sheaths from waves in the ion cyclotron range of frequencies (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2890-2900 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental evidence suggests that unabsorbed wave energy in ion cyclotron range of frequency fast wave (FW) experiments can result in deleterious edge interactions. A model describing the formation of far field sheaths due to FW interaction with material surfaces is presented. Near conductors that do not conform to flux surfaces, an incoming FW causes the generation of a slow wave (SW) component. The E(parallel) of the SW drives an RF sheath, in a manner similar to what has been previously discussed for antenna (near field) sheaths. To assess the importance of the proposed mechanism, a heuristic scaling model of the resultant sheath voltage V is developed and compared with a numerical code. The model illustrates the important dependencies of V on the single pass absorption, edge density, FW frequency, FW cutoff location, and limiter/wall geometries and yields qualitative agreement with the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870529
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  • 7
    Electronic Resource
    Electronic Resource
    Generalized electron fluid equations in the presence of laser irradiation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3003-3007 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Generalized fluid models have become increasingly popular for incorporating kinetic effects in hydrodynamic studies of laser–plasma interactions. However, their transport coefficients depend on the source of the thermal perturbation, which leads to difficulties, since both inverse-bremsstrahlung heating and pdV work drive these perturbations. Treating these sources separately using a model with two energy equations is proposed. Tested against electron Fokker–Planck simulations, this model reproduces both Landau damping of ion-sound waves and the correct response to inverse bremsstrahlung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870540
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  • 8
    Electronic Resource
    Electronic Resource
    On the ideal initial value problem for the neutral sheet (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3053-3058 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ideal initial value problem for the neutral sheet is considered, with the emphasis on fieldwise-independent, infinitesimal velocity disturbances. It is shown analytically that cross-field velocity perturbations persist, and that they also set up fieldwise magnetic disturbances that grow algebraically in time. When these disturbances attain finite amplitude they should distort the neutral sheet configuration, and hence they could provide an alternative route by which magnetic reconnection can become turbulent. Some supporting numerical simulations, performed at large Lundquist numbers, are then described. In an Appendix the analysis is extended to include fieldwise-dependent disturbances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870497
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  • 9
    Electronic Resource
    Electronic Resource
    Starting oscillation conditions for gyrotron backward wave oscillators (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3093-3099 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized linear theory that allows for mismatched boundary conditions was used in determining the starting oscillation conditions for gyrotron backward wave oscillators (gyro-BWO). The results reveal that the gyro-BWO interaction is normally caused by the interference between a constant-amplitude backward wave and a decaying backward wave. The latter becomes a forward-growing wave if the operating frequency is close to the waveguide cutoff frequency. The starting oscillation length for a reflection-type gyro-BWO is shorter than that of a matched-type gyro-BWO. The mismatch has more of an effect upon the onset of a gyro-BWO, which is operated close to the cutoff frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870500
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  • 10
    Electronic Resource
    Electronic Resource
    Stability of bootstrap current-driven magnetic islands in stellarators (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 3135-3137 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of magnetic island producing perturbations due to fluctuations in the bootstrap current in stellarator configuration is examined. The stability criterion depends on the sign of the derivative of the rotational transform, the pressure gradient, and the direction of the equilibrium bootstrap current, which is determined by the structure of ||B||. It is found that quasihelically symmetric stellarator configurations with p'/ι'〈0 are unstable to the formation of bootstrap current-driven magnetic islands. The stability of conventional stellarator configurations depends upon the field structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870505
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