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  • 1
    Electronic Resource
    Electronic Resource
    Demonstration of a 10 kW average power 94 GHz gyroklystron amplifier (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4405-4409 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The experimental demonstration of a high average power W-band (75–110 GHz) gyroklystron amplifier is reported. The gyroklystron has produced 118 AW peak output power and 29.5% electronic efficiency in the TE011 mode using a 66.7 kV, 6 A electron beam at 0.2% rf duty factor. At this operating point, the instantaneous full width at half-maximum (FWHM) bandwidth is 600 MHz. At 11% rf duty factor, the gyroklystron has produced up to 10.1 kW average power at 33% electronic efficiency with a 66 kV, 4.15 A electron beam. This represents world record performance for an amplifier at this frequency. At the 10.1 kW average power operating point, the FWHM bandwidth is 420 MHz. At higher magnetic fields and lower beam voltages, larger bandwidths can be achieved at the expense of peak and average output power. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873726
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling and design of millimeter wave gyroklystrons : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2233-2240 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of high power, high efficiency Ka-band and W-band gyroklystron experiments has been conducted recently at the Naval Research Laboratory (NRL). Stagger tuning of the cavities for bandwidth enhancement is commonly used in the conventional multicavity klystrons. The desired stagger tuning is usually achieved via mechanical tuning of the individual cavities. However, in the millimeter wave regime, particularly, in the case of the high average power operation, it is desirable to be able to achieve the required stagger tuning by design. The NRL gyroklystron experiments explored the tradeoffs between power, bandwidth, efficiency, and gain to study the effects of large stagger tuning in millimeter wave without resorting to mechanical tuning of the cavities. Both, Ka-band and W-band, experiments demonstrated a record power-bandwidth product. The success of the experiments was due in large part to a battery of improved large-signal, stability, and cold test codes employed in the modeling and design stage. Theoretical models that provide the basis for these design simulation tools and the design methodology will be presented. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873476
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  • 3
    Electronic Resource
    Electronic Resource
    Marginal singularities, almost invariant sets, and small perturbations of chaotic dynamical systems (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 1 (1991), S. 347-356 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For a class of piecewise monotone locally noncontracting maps f:X→X with small "traps'' Yε⊆X (diam(Yε)≤ε), the existence of smooth conditionally f-invariant measures με are proved, corresponding to a limit as n→∞ conditional probabilities that fn+1x∈X(backward-slash)Yε if x,fx,...,fnx∈X(backward-slash)Yε and the point x is chosen at random. Also proven is the convergence of με to smooth f-invariant measures as ε→0. By means of this construction, the numerical phenomenon of the convergence of histograms of trajectories of maps with marginal singularities to densities of nonfinite smooth invariant measures in the computer modeling was investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.165846
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  • 4
    Electronic Resource
    Electronic Resource
    A photoacoustic joulemeter for millimeter wave radiation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 166-171 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel calorimeter for millimeter wave radiation based on the photoacoustic effect has been investigated. Single pulses from a 3-μs, 1-MW gyrotron operating between 135 and 150 GHz were measured. The joulemeter has both a slow time response (〈500 Hz), due to gas expansion, and a fast time response ((approximately-greater-than)500 Hz), due to acoustic modes of the resonator and windows. The slow time response, which was more suitable for power and energy measurements, was compared with a calibrated thermopile detector and was found to be linear over the range of 0.15–3 J, with an error of less than ±5% near 3 J. The calorimeter was also tested with modes having different power distributions in space; the response was found to be independent of spatial power distribution. The joulemeter is a simple, rugged device that can be used in transmission or absorption mode. Use in transmission mode is attractive for basic research on high-power microwave sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142950
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