Results 101 to 110 of about 198 (133)
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Output Characteristics of the Axially Extracted Virtual Cathode Oscillator With a Cathode-Wing
IEEE Transactions on Plasma Science, 2009Having the merits of conceptual simplicity, high-output-power capacity, and wide tuning characteristics, the vircator (virtual cathode oscillator) has been investigated as a high-power microwave (HPM) generator. In axial vircator, the power, frequency, and pulsewidth are all sensitive to the cathode shape, and the frequency depends strongly on the ...
null Ki Baek Song +3 more
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Proceedings International University Conference 'Electronics and Radiophysics of Ultra-High Frequencies' (Cat. No.99EX356), 2003
In a system with a VC the oscillation of the virtual cathode results in parametric excitation of oscillations of the electrons and in phase modulation of the electron flow. In this case, the width of the electron bunch is determined by the space charge field and by the anode transparency.
V.P. Grigoryev, T.V. Koval
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In a system with a VC the oscillation of the virtual cathode results in parametric excitation of oscillations of the electrons and in phase modulation of the electron flow. In this case, the width of the electron bunch is determined by the space charge field and by the anode transparency.
V.P. Grigoryev, T.V. Koval
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Time-frequency analysis of virtual cathode oscillator
2009 IEEE Pulsed Power Conference, 2009Time-frequency analysis has been carried out for microwave radiation from a virtual cathode oscillator. The results have given clear evidence of mode hopping and frequency shifting. The dependence of mode competition on the diode operation parameters is also identified.
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A Radially and Axially Extracted Virtual-Cathode Oscillator (Vircator)
IEEE Transactions on Plasma Science, 1985Experiments are described in which a 5-? 1-MeV pulser drives virtual-cathode systems optimized to emit microwave radiation in the X band. Radiation is extracted both axially in TM modes and radially in TE modes. The threshold for microwave emission is found to be several times the space-charge limited current.
H. Sze +4 more
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Frequency Variation of a Reflex-Triode Virtual Cathode Oscillator
IEEE Transactions on Plasma Science, 2013We present a study of the shot-to-shot variation in frequency of a reflex-triode virtual cathode oscillator with respect to peak diode voltage, current, impedance, and perveance. The typical electron-beam parameters were 185 kV, 7 kA, and 300 ns, with a current density of a few hundreds of amperes per square centimeter. The one-way analysis of variance
Amitava Roy +2 more
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High-Power Microwave Generation by Virtual Cathode Oscillator
IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science, 2005Virtual cathode oscillators (VCO) were studied for high-power microwave (HPM) generation. Different configurations of VCO were compared in diode behavior and microwave output in order to optimize the performance of VCO as an HPM oscillator. The experimental results were also compared with numerical simulation results obtained with particle-in-cell code
Weihua Jiang +4 more
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Dynamics of a virtual cathode oscillator driven by a pinched diode
The Physics of Fluids, 1986A new method is demonstrated for extracting radiation from a virtual cathode oscillator in transverse electric (TE) waveguide modes. The dominant radiation mechanism occurs in the region of the virtual cathode, and is not due to reflexing of electrons. Microwave radiation occurs simultaneously or just after beam pinching in the diode.
H. Sze, J. Benford, W. Woo, B. Harteneck
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Experimental results from a coaxial virtual cathode oscillator
Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference, 2002The coaxial vircator generates microwave radiation by injecting a radial electron beam into a cylinder such that the space-charge limit of the region is exceeded. A virtual cathode forms and oscillates in radial position and amplitude, generating microwaves which are extracted through an attached waveguide with a circular cross-section.
M. Crawford +2 more
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Feasibility Study of Axially- Extracted Virtual Cathode Oscillator
International Journal of Infrared and Millimeter Waves, 2007In this paper, we have analyzed the design parameters of the axially - extracted virtual cathode oscillator, which is high-power microwave source based on the concept of the virtual cathode associated with the intense relativistic electrons beam oscillations in the electrostatic potential well.
G. Singh, M. V. Kartikeyan
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Output analysis of a coaxial virtual cathode oscillator [vircator]
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786), 2004Summary form only given. In this work, a coaxial virtual cathode oscillator (vircator) has been investigated. Horn antennas are widely used in the output of high power microwave tubes. The output characteristics of a vircator circular horn antenna with TM mode operations are studied.
null Ming-Chieh Lin, null Kuo-Hua Huang
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