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  • 2005-2009  (21)
  • 1985-1989  (31)
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  • 1
    Electronic Resource
    Electronic Resource
    Propagation of wiggler focused relativistic sheet electron beams (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6-11 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A recent design concept for millimeter-wave free-electron lasers [J. Appl. Phys. 60, 521 (1986)] would require the stable propagation of a sheet electron beam through a narrow waveguide channel. Experimental results reported in this article support the feasibility of such a configuration by demonstrating the stable propagation of relativistic sheet electron beams through a narrow waveguide gap (3.2 mm) using focusing by a short-period electromagnet wiggler. 90% of the electron current in a 100-keV sheet electron beam was transmitted through a 5-cm-long channel with peak wiggler fields of 800 G. Almost 80% of a 400-keV beam was similarly confined with a 1600-G wiggler field. The data were consistent with single electron trajectory models, indicating that space-charge effects were minimal. No evidence of beam breakup or filamentation instabilities was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341221
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  • 2
    Electronic Resource
    Electronic Resource
    Spontaneous radiation of an electron beam in a free-electron laser with a quadrupole wiggler (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1584-1590 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A calculation is presented of spontaneous radiation emitted by an electron beam passing through a continuously rotating quadrupole magnetic undulator. It is shown that radiation spectrum emitted in forward direction of beam propagation has four peaks, corresponding to four betatron frequencies. Utilizing the Madey theorem, a stimulated emission is calculated and presented as gain versus frequency curves, for different values of the quadrupole magnetic field. A free-electron laser operating at two or three radiation frequencies with a quadrupole magnetic wiggler is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337295
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  • 3
    Electronic Resource
    Electronic Resource
    Electron orbits in combined rotating quadrupole and dipole magnetic fields (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2634-2637 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The single-particle trajectories of relativistic electrons in a magnetic field configuration which consist of a periodic wiggler field produced by a helical winding of two wires ("dipole'' magnetic field) superimposed on a helical winding of four wires (continuously rotating "quadrupole'' magnetic field) are studied. The orbit equations can be reduced to a system of linear, inhomogeneous differential equations for variables related to transverse velocities. These equations are solved exactly and the stability region for the electron orbits in wide range of the parameters is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336966
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear analyses for optimized short-period-wiggler free-electron laser oscillators (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1453-1459 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Procedures to determine the parameters of optimized (for maximum efficiency) experimental short-period-wiggler free-electron laser (FEL) oscillators are presented. The calculations are based on a normalized set of nonlinear equations which describe a one-dimensional FEL oscillator. Scaling formulas relating the normalized theoretical parameters to dimensional experimental quantities are obtained. The physics of such realistic effects as waveguide dispersion, wiggler field dependence on magnet gap, beam energy spread, and the frequency tunability of tapered wigglers are considered. Finally, specific examples for both tapered and untapered 300-GHz, 1.0-MW FEL oscillators are calculated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342958
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  • 5
    Electronic Resource
    Electronic Resource
    Efficiency optimization for free-electron laser oscillators (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 435-439 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a normalized set of nonlinear equations, which describe a free-electron laser (FEL) oscillator, the efficiency of energy extraction from the electron beam to the radiation can be optimized. The optimum values of this efficiency are presented for (a) an untapered and (b) a tapered wiggler FEL oscillator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859158
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  • 6
    Electronic Resource
    Electronic Resource
    Linear stability of obliquely propagating electromagnetic waves in magnetically insulated gaps (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3851-3857 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A linear stability analysis for obliquely propagating electromagnetic waves in a magnetically insulated planar anode–cathode gap is presented. Previously published work [Phys. Fluids 24, 1821 (1981)] considered propagation perpendicular and parallel to the insulating magnetic field. Here the effect of propagation at oblique angles to the insulating field is considered. In general, growth rates decrease monotonically when the propagation angle becomes more parallel to B, and this effect is more pronounced for shorter-wavelength waves for which analytic asymptotic results are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865768
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  • 7
    Electronic Resource
    Electronic Resource
    Stability of magnetically insulated ion diodes (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1948-1955 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetically insulated ion diodes are examined for instability using analytical and numerical techniques. Two basic sources which drive instability are found: one due to a two-stream-type interaction between electrons and ions and the other due to ion transit time effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864939
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  • 8
    Electronic Resource
    Electronic Resource
    Mode competition and suppression in free electron laser oscillators (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1097-1108 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of single-mode operation of free electron laser (FEL) oscillators is investigated. Two models of an untapered FEL oscillator are considered. The first model is called the klystron model. In the klystron model the FEL interaction occurs at two points: a prebunching point and an energy extraction point. In this model the nonlinear electron dynamics are solvable exactly, leading to a complex delay equation for the wave fields. The stability of single-mode operation can then be determined easily as a function of a single-pass gain, energy mismatch–frequency, and the difference between the group velocity of the radiation and the beam velocity. The second, more realistic model has a distributed interaction region of finite length: Stability of single-mode operation in this device must be determined numerically. The results of the models in the low gain regime are compared and the parameter regimes where stable single-mode operation is possible are determined. It is found that the time to reach a single-mode state can be extremely long.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858980
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  • 9
    Electronic Resource
    Electronic Resource
    Linear theory of a sheet beam free electron laser (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3379-3386 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear theory of a free electron laser based on a sheet beam propagating in a narrow gap is developed. The three-dimensional structure of the radiation field is determined for an infinitely thin sheet beam. Included are the effects of diffraction and space charge. The possibility of diffractive suppression of unwanted modes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866903
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  • 10
    Electronic Resource
    Electronic Resource
    Parametric scaling of the stability of relativistic laminar flow magnetic insulation (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2878-2881 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The short wavelength limit of the magnetron instability of a relativistic sharp boundary electron sheath is examined. For short wavelengths the mode is localized to the sheath edge. This localization leads to a simple relationship (essentially a Lorentz transformation) between the relativistic and nonrelativistic growth rates. This relationship involves only equilibrium quantities evaluated at the sheath edge and explains previously noted trends that have been observed numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865208
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