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  • 1
    Electronic Resource
    Electronic Resource
    Comments on "Dispersion relation of a plasma in the periodic magnetic field of a wiggler" [Phys. Plasmas 3, 1773 (1996)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2768-2768 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is argued that the equilibrium state of a wiggler background magnetoplasma corresponds to a zero momentum rather than to a plasma acquiring a non-zero velocity. (AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872398
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  • 2
    Electronic Resource
    Electronic Resource
    High-gain reverse guide field free electron lasers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3865-3870 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron beam trajectories under circularly polarized external wigglers in free electron laser devices with axial guide fields are reconsidered by introducing the self-fields of the electron beam. The competition between the self-fields and the wiggler field plus the action of the guide field are not only responsible for the known positive guide field singularity, but also the new reverse guide field singularity. The physics of the new reverse field singularity relies on the fact that an azimuthal magnetic field uniform in z is able to generate steady-state helical beam orbits just as if it were a transverse wiggler. According to this theory, the handness of the circularly polarized microwave should depend on the guide field configuration. High-gain strong pump equations coupled to these trajectories are used to account for the Massachusetts Institute of Technology reverse guide field results [Phys. Rev. Lett. 67, 3082 (1991)]. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871469
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  • 3
    Electronic Resource
    Electronic Resource
    Force-free field model of ball lightning (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 687-689 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Due to the nature that the force-free magnetic field, whose current carried by the conducting plasma is everywhere parallel to the magnetic field it generates, is the minimum energy configuration under the constraint of magnetic helicity conservation, ball lightning is considered as a self-organized phenomenon with a plasma fireball immersed in a spherical force-free magnetic field. Since this field does not exert force on the plasma, the plasma pressure, by itself, is in equilibrium with the surrounding environment, and the force-free magnetic field can take on any value without affecting the plasma. Due to this second feature, singular solutions of the magnetic field that are otherwise excluded are allowed, which enable a large amount of energy to be stored to sustain the ball lightning. The singularity is truncated only by the physical limit of current density that a plasma can carry. Scaling the customary soccer-size fireball to larger dimensions could account for day and night sightings of luminous objects in the sky. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343511
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  • 4
    Electronic Resource
    Electronic Resource
    Plasma multipole radiation model of sonoluminescence (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3027-3029 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By considering the material at the center of a sonoluminescent bubble in a plasma state, a point source multipole radiation model is proposed to account for the light flash in each acoustic cycle. The photon number N is calculated as a function of the electron plasma temperature. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873589
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  • 5
    Electronic Resource
    Electronic Resource
    Space-charge plasma-circuit instability in cw CO2 laser axial discharge plasmas (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 199-201 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intense voltage spikes of about 10 μs width in high voltage direct current (dc) axial discharges, particularly, in continuous wave (cw) CO2 laser systems, are analyzed by a bound plasma model subject to external circuit constraint. The spikes, whose amplitude grows from cathode to anode, are believed to be a manifestation of the convective space-charge instability of the ion acoustic plasma-circuit mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870919
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  • 6
    Electronic Resource
    Electronic Resource
    Plasma impedance and electron density in a pulsed laser channel (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8269-8273 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The representation of plasma impedance of gas laser discharge and spark gap channels by an inductance–capacitance (Lp−Cp) tank circuit has been useful in describing the frequency response of a pulsed superradiant laser charging circuit. The impedance matching of these plasma channels can lead to resonant narrowing of the laser pulsewidth in superradiant nitrogen lasers. Using fluid equations to model the electron and ion plasmas, the impedance of plasma channels is formulated. This derived impedance supports the phenomenological Lp−Cp tank circuit configuration, and provides the means to calculate the inductance and capacitance in terms of the plasma density and discharge dimensions. Conjugating this model with the pulse width narrowing via plasma impedance matching, the electron density at the very moment of lasing in a superradiant gas laser channel can be estimated by using the measured Lp and Cp. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362466
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  • 7
    Electronic Resource
    Electronic Resource
    Variational and transport properties of high-pressure arc plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2707-2712 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: One-dimensional steady-state transport equations are used to describe the equilibrium state of multiple species cylindrically symmetric arc plasmas. The effects of axial and azimuthal variations are introduced through the boundary conditions at the center. It is shown that the axisymmetric case of m=0 is actually the case of large m being smoothed out by thermal fluctuations where m is the azimuthal mode number. The conservation of mass density flux gives rise to mutual diffusion and a criterion is given to predict which neutral species should concentrate at the center and vice versa. By writing the energy balance equation in the form of action integral, it is clear that the power dissipation is always a minimum, thus proving the Steenbeck's minimum principle. A local thermal equilibrium model is used to obtain the electron density. This model is tested against the experimental results of a helium arc with copper electrodes at atmospheric pressure. The steep positive density gradient of the copper is the consequence of pressure balance with the much higher density helium, and the steepness is directly related to the disparity of the two densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339421
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  • 8
    Electronic Resource
    Electronic Resource
    High gain strong pump free-electron lasers with fast 2π/kw spatial oscillations (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3032-3035 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the high gain strong pump regime, the radiation field amplitude and phase can vary substantially over a wiggler period. Also, due to the periodic transverse motion, the longitudinal electron energy suffers large variations over the same distance. Because of these considerations, the spatial average that leads to the classical one-dimensional free-electron laser equations is not applicable here. Thus the rederived equations suitable for the high gain strong pump regime contain 2π/kw periodic terms. Comparisons with the Electron Laser Facility (ELF) experiments of the Lawrence Livermore National Laboratory [Phys. Rev. Lett. 54, 889 (1985); 57, 2172 (1986); Phys. Rev. A 35, 2184 (1987)] on the operational characteristics including the relative phase of the radiation field are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860689
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  • 9
    Electronic Resource
    Electronic Resource
    Radial eigenmodes of the discrete Alfvén spectrum (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2617-2618 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The eigenfrequencies and eigenmodes of the discrete Alfvén spectrum for a straight tokamak plasma with constant current density profile are solved analytically. The results offer a clear physical insight into the eigenfrequency scaling and mode asymmetry mentioned in earlier works using numerical calculations and a variational technique for a real plasma profile. It is also shown that the ion-cyclotron frequency broadens the spacing of the eigenfrequencies of the ideal magnetohydrodynamic spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865218
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  • 10
    Electronic Resource
    Electronic Resource
    Superradiant free-electron lasers in the high-gain strong pump regime (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3808-3812 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-dependent high-gain free-electron laser equations are generalized to the strong pump regime where fast, 2π/kw, spatial oscillations can no longer be eliminated by spatial averages, and evolution of the radiation phase needs to be taken into account. The equations are solved numerically along the characteristics of the beam and the laser field for superradiant solutions in the strong pump regime using the parameters of the Electron Laser Facility (ELF) of the Lawrence Livermore National Laboratory, [Phys. Rev. Lett. 54, 889 (1985); Nucl. Instrum. Methods A 250, 144 (1986); 285, 217 (1989); Phys. Rev. A 35, 2184 (1987)]. With beam pulses short compared to the wiggler length and long compared to the cooperation length, numerical solutions show that the initial laser fields get amplified to the steady-state level intensity in only a few bucket distances in the slippage region along the beam characteristics. The underlying mechanism for this superradiant gain gradient is due to the amplification of the incoming fields by the electrons prebunched by the earlier outgoing fields. Contrary to the earlier results, no spikes on the laser amplitude is observed in the slippage region. On the other hand, the solutions do show spikes on the relative laser phase. However, it is not clear on the credibility and the significance of these spikes, whether in amplitude or in phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860598
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