Experimental and Simulation Studies of New Configuration of Virtual Cathode Oscillator

Jiang, Weihua; Shimada, N.; Prasad, Sudhakar; Yatsui, Kiyoshi

doi:10.1109/tps.2004.823979

Cited by 66 publications

(54 citation statements)

References 12 publications

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“…9 While there are various other types of vircators, a method has also been studied for increasing oscillation efficiency by increasing the interaction between the electron beam and electromagnetic waves using a resonator or double anode. 10 In this article, we verified the effectiveness of a double-anode vircator (see Figure 2D).…”

Section: Introductionmentioning

confidence: 58%

High Power Microwave Generation by Double-Anode Virtual Cathode Oscillator

et al. 2019

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The virtual cathode oscillator (vircator) is one of the promising devices to oscillate high-power microwaves. Simplicity and high-power capability are advantages. However, the low efficiency and frequency stability are serious problems. In this article, we dealt double anode to strengthen the microwave interactions. The measurement result shows that the output of the virtual cathode oscillator can be progress by using the double-anode. K E Y W O R D Sdouble-anode, feedback, high-power microwave, virtual cathode oscillator Electr Eng Jpn. 2020;210:11-18.

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Section: Introductionmentioning

confidence: 58%

High Power Microwave Generation by Double-Anode Virtual Cathode Oscillator

et al. 2019

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“…The electron beams coming from the two cathodes first form two independent virtual cathodes in the resonant cavity. The two virtual cathodes gradually interact with each other and finally become phase locked to oscillate coherently [4]. As a consequence, TM 010 mode of the resonant cavity is excited strongly.…”

Section: Simulation Study Of the Vircatormentioning

confidence: 99%

Characterization of Cesium Iodide-Coated Carbon-Fiber Aluminum Cathode for an <inline-formula> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula>-Band High-Efficiency Vircator

Cai

et al. 2015

IEEE Trans. Plasma Sci.

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Carbon-fiber-aluminum (CFA) cathode is characterized to generate high-power microwave (HPM) from a high-efficiency three-cavity virtual-cathode oscillator (vircator). Plasma expansion velocity associated with the cesium iodide (CsI)-coated CFA cathode is determined in the experiment. It is found that the stationary plasma expansion velocity is diminished by CsI-coating to about 3 cm/µs when driving by a 300-kV electrical pulse. Particle-in-cell (PIC) simulations indicate that the proposed vircator is capable of generating 550-MW S-band HPM at a central frequency of 2.1 GHz, when the diode voltage and current are 420 kV and 9.2 kA, respectively. The corresponding power conversion efficiency is as high as 14%. The generated HPM is with the TE 10 mode of rectangular waveguide, which can give rise to an on-axis radiation pattern without requiring mode converter.Index Terms-Carbon fiber, high-power microwave (HPM), plasma expansion, vircator, virtual cathode oscillator (VCO).

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“…While a magnetic field has been found to aid efficiency by barring the reflected electrons from the diode region in an axially emitted VIRCATOR [27], the presence of a resonant cavity [8] or a reflector at an optimum distance [15], [16] has led to an increase in efficiency in case of the coaxial VIRCATOR.…”

Section: Modification Of the Axial Vircatormentioning

confidence: 99%

Efficiency Enhancement of the Axial VIRCATOR

Biswas

Kumar

2007

IEEE Trans. Plasma Sci.

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We present in this paper the particle-in-cell simulation results of a modified axial virtual cathode oscillator having a metallic drum of radius R 1 placed coaxially inside the drift tube at a distance D 1 from the foil anode. The enlarged parameter space permits control of the current transmitted to the collection plate, the net diode current, and the size of the electromagnetic emission and extraction regions. The geometry allows lowfrequency radiation as well as high-frequency microwaves to leak out from the extraction region. The microwave content in the total electromagnetic power is found to be maximum when the drum is sufficiently close to the anode but far enough to allow the formation of a virtual cathode and permit a large emission region. The microwave power and efficiency also depend sensitively on the radius of the metallic drum. As the drum radius increases, the diode current and cutoff-frequency for transverse-magnetic (TM) modes increase while the extraction window shrinks in size. For parameter values studied, a peak locally time-averaged (over several periods) microwave power of 210 MW was obtained using a square voltage pulse of 250 kV at an efficiency of 7% while the peak-period averaged power was found to be 275 MW. In the absence of the drum, the peak locally time-averaged microwave power obtained was 93 MW at an efficiency of 3.3%.Index Terms-Microwave, open drift tube, particle-in-cell (PIC), virtual cathode oscillator (VIRCATOR).

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Experimental and Simulation Studies of New Configuration of Virtual Cathode Oscillator

Cited by 66 publications

References 12 publications

High Power Microwave Generation by Double-Anode Virtual Cathode Oscillator

High Power Microwave Generation by Double-Anode Virtual Cathode Oscillator

Characterization of Cesium Iodide-Coated Carbon-Fiber Aluminum Cathode for an <inline-formula> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula>-Band High-Efficiency Vircator

Efficiency Enhancement of the Axial VIRCATOR

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