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Characteristics of diode perveance and vircator output under various anode-cathode gap distances

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12 Author(s)
Eun Ha Choi ; Dept. of Electrophys., Kwangwoon Univ., Seoul, South Korea ; Myung Chull Choi ; Sung Hyuk Choi ; Kie Back Song
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When an electron beam is generated from a cathode, an electrode sheath plasma is also generated. Hence, the perveance of the diode is varied and changes the diode output characteristics. In our pulsed-power system "Chundoong," the perveance characteristics have been experimentally investigated, from which the sheath-plasma expansion speed has been measured to be about 3 cm/μs inside the diode. It is shown that the sheath-plasma expansion inside the diode gives the influence on the electron-beam current density. The vircator microwave output has been shown to be sensitively dependent on the anode-cathode (A-K) gap distance. The highest microwave power occurs at the initial A-K gap distance d=4 mm with peak power of 200 MW and a frequency of about 5.5 GHz in this experiment.

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Plasma Science, IEEE Transactions on  (Volume:30 ,  Issue: 5 )