Abstract
As the impedance of the foilless diode for a relativistic backward wave oscillator and the transmission line of the high-current accelerator are mismatching, a method is brought forward to study the voltage and current transient process of the foilless diode by analyzing the voltage and current wave reflection and superposition. In addition, by theoretical analysis, particle-in-cell numerical simulations and experiment based on the SINUS-881 accelerator, the effects of periodic oscillations of growth rate in the high-voltage pulse's rising edge applying to the diode from the Tesla-type accelerator and the time when the cathode begins to emit on transient process are discussed. In addition, the characteristics of rising edges of voltage and current are meticulously discerned.
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