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  • 1
    Electronic Resource
    Electronic Resource
    Helical peniotron backward wave oscillators (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2409-2411 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The performance of peniotron backward wave oscillators which utilize the axis-encircling beam generated by a combined solenoidal and wiggler magnetic field was investigated through computer simulations. The potential advantages of this new configuration are that it is capable of converting both beam longitudinal and transverse energy into radiation and reducing the severity of mode competition. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114563
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  • 2
    Electronic Resource
    Electronic Resource
    Pulsating mode in peniotron backward wave oscillations (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 4094-4098 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A sustainable pulsating mode in peniotron backward wave oscillations can be excited if parameters are properly chosen, such that at some instant of time the reduction in beam energy resulting from the electron–wave interaction is to such an extent that its cyclotron harmonic line intersects with the waveguide dispersion curve in the positive kz region. The generation of the forward traveling self-oscillating mode eliminates the residual backward traveling wave, which is very essential in establishing relaxation oscillation. As a result, the time evolution of the output wave becomes self-pulsating. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870879
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  • 3
    Electronic Resource
    Electronic Resource
    Dependence of efficiency on magnetic field in gyro-backward wave oscillators (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2314-2317 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A gyro-backward wave oscillator with its oscillation frequency close to the waveguide cutoff frequency has been experimentally demonstrated by other investigators to attain near 20% efficiency. Computer simulations have been carried out to elucidate the mechanisms which give rise to this high efficiency regime. The result shows that one of the plausible mechanisms is the resulting large frequency mismatch (detuning) which places the electron bunch in azimuthal phase close to where the maximum electron–wave coupling occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860765
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  • 4
    Electronic Resource
    Electronic Resource
    Stabilization of the absolute instability in cyclotron autoresonance maser amplifiers by a drive wave (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2286-2288 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is demonstrated through computer simulations that a cyclotron autoresonance maser (CARM) amplifier with finite output pulse width operated in a high-order waveguide mode, such as the TE01 mode, is feasible. This is because the absolute instability grows from the initial beam noise fluctuation and takes a certain time interval to become disruptive to the desired amplification process. A drive wave with sufficiently high intensity can further reduce the growth rate of the absolute instability and prolong the stable amplification period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859044
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: "Unified theory and comparative study of cyclotron masers, ion-channel lasers, and free electron lasers'' [Phys. Fluids B 3, 1270 (1991)] (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 3203-3203 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860004
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  • 6
    Electronic Resource
    Electronic Resource
    Competition of electron-cyclotron maser and free-electron laser modes with combined solenoidal and longitudinal wiggler fields (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1348-1351 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A relativistic electron beam with a finite transverse dc momentum (β⊥=1/γ0) passing through a region of combined uniform solenoidal and longitudinal wiggler magnetic fields is observed to convert 25% of its kinetic energy into coherent radiation at frequency ω=γ20(kwV0+Ωc/γ0) if the phase velocity of the generated wave is slightly above the speed of light. In this situation, the bunchings of the slow electron-cyclotron mode and free-electron laser modes with combined solenoidal and longitudinal wiggler fields (lowbitron) are observed to compensate each other, which gives rise to a finite threshold for lowbitron operation. In order to attain high efficiency, the wiggler strength of a lowbitron must substantially exceed the threshold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865699
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear dynamics of the gyrotron traveling wave amplifier (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2403-2408 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mode interactions in the gyrotron traveling wave tube amplifier (gyro-TWT) are examined with particle simulations and compared with experimental observations. Studies focus on the competition between the absolute and convective instabilities. Detailed diagnostics on mode structures, field growth profiles, and evolution of electron distribution in momentum and energy spaces allow an in depth look at the basic physical processes, such as the mechanism of mode competition and suppression. Mutual verifications between the theory and experiment have strengthened understanding of the multimode behavior and added to the predictability of high-power gyro-TWT's.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859610
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  • 8
    Electronic Resource
    Electronic Resource
    Gyrophase-coherent electron cyclotron maser (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3120-3126 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The basic physics of an electron cyclotron maser driven by a coherently gyrophased, helical electron beam in a uniform magnetic field is analyzed. Theoretical predictions of gain enhancement and reduction in different regimes of the cyclotron instability, compared to a gyrotropic cyclotron maser, are verified with computer simulations. A physical explanation is presented for these findings. Beam-to-radiation energy conversion efficiency in the autoresonance regime is studied with computer simulations and compared with that for a gyrotropic beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866968
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  • 9
    Electronic Resource
    Electronic Resource
    Linear theory of an electron cyclotron autoresonance maser with a "phase filter'' (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3116-3119 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear growth rate of an electron cyclotron autoresonance maser (CARM) with a phase filter, constructed by imposing a transverse magnetostatic wiggler, is derived from relativistic kinetic theory. The theoretical results confirm previous findings from computer simulation showing substantial enhancement of the growth rate near the autoresonance condition. This theory provides an additional, more readily accessible tool for designing a novel phase filter-assisted CARM. The mathematical formalism developed to treat the complex electron motion in this device is introduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866967
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  • 10
    Electronic Resource
    Electronic Resource
    Unified theory and comparative study of cyclotron masers, ion-channel lasers, and free electron lasers (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1270-1278 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A unified small-signal amplification theory is developed to compare growth mechanisms responsible for a number of relativistic radiation generators. The theory is formulated from the basis that the electron resonance frequency produced by the external fields of the devices depends on γ−q, where γ is the beam Lorentz factor and q is a constant (q=1 for cyclotron masers, q=1/2 for ion-channel lasers, and q=0 for free electron lasers). It is concluded that for wave amplification, the sign of the electron mismatch frequency is required to be the same as the sign of bunching parameter that is determined by the total bunching both axial and azimuthal; this depends on the q value. The two bunching mechanisms exist, not only in the single electron resonance regime, but also in the collective gain regime. Competition or reinforcement between the two bunching mechanisms is determined by the q value, the electron axial velocity, and the wave phase velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859819
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