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When the electron beam is generated from the cathode, the electrode sheath plasma is also generated, and hence the perveance of diode is being vaned to change 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 found to he an about 3 c d~s inside the diode. It is shown inside the diode that the sheath plasma expansion gives the influence on the electron beam current density.~ The Vircator microwave output has been shown to he dependent especially on A-K gap distance of which initial 4 mm in A-K gap distance' is found to he optimized for maximum power.

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