Analysis of cavity excitation driven by a modulated electron beam in Klystrode

Summary form only given. In this paper we present a theoretical model and MAGIC PIC analysis of the cavity excitation in Klystrode driven by a modulated electron beam, which was based on the circuit representation. Several points are noteworthy from numerical calculation and MAGIC PIC simulation. First, the amplitude and phase shift of the induced voltage indicate a damping oscillation. The oscillation frequency is proportional to the frequency mismatch. Second, the rise time of the normalized amplitude and transferred power increases with increasing value of the current rise time. Third, the rise time of the amplitude and transferred power decreases as the absolute value of the frequency detune parameter increases. For a large value of the frequency detune parameter, the power transfer from the modulated beam to the cavity occurs at the beginning of the beam pulse. The absolute total energy delivered from the beam to the cavity decreases drastically as the frequency mismatch increases.