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• W2000341600 endingPage "015011" @default.
• W2000341600 startingPage "015011" @default.
• W2000341600 abstract "Properties of the plasma and beam flow produced by tufted carbon fiber cathodes in a diode powered by a ∼500 kV, ∼400 ns pulse are investigated. Under electric fields of 230–260 kV cm−1, the electron current density was in the range 210–280 A cm−2, and particularly at the diode gap of 20 mm, a maximum beam power density of about 120 MW cm−2 was obtained. It was found that space-charge-limited current exhibited an evolution behavior as the accelerating pulse proceeded. There exists a direct relation between the movement of plasma within the diode and the evolution of space-charge-limited current. Initially in the accelerating pulse, the application of strong electric fields caused the emission sites to explode, forming cathode flares or plasma spots, and in this stage the space-charge-limited current was approximately described by a multiple-needle cathode model. As the pulse proceeded, these plasma spots merged and expanded towards the anode, thus increasing the emission area and shortening the diode gap, and the corresponding space-charge-limited current followed a planar cathode model. Finally, the space-charge-limited current is developed from a unipolar flow into a bipolar flow as a result of the appearance of anode plasma. In spite of the nonuniform distribution of cathode plasma, the cross-sectional uniformity of the extracted electron beam is satisfactory. The plasma expansion within the diode is found to be a major factor in the diode perveance growth and instability. These results show that these types of cathodes can offer promising applications for high-power microwave tubes." @default.
• W2000341600 created "2016-06-24" @default.
• W2000341600 creator A5012663782 @default.
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• W2000341600 date "2008-12-05" @default.
• W2000341600 modified "2023-10-18" @default.
• W2000341600 title "Plasma-induced evolution behavior of space-charge-limited current for multiple-needle cathodes" @default.
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• W2000341600 doi "https://doi.org/10.1088/0963-0252/18/1/015011" @default.
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