Low-frequency cavity oscillation driven by detuned current modulation

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:51843

Uhm, H S ^[1]

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1. Naval Surface Warfare Center, Silver Spring, MD (United States)

A theoretical model of cavity excitation driven by a modulated electron beam is developed in connection with application to relativistic klystron amplifiers. Based on an equivalent circuit representation of a cavity impedance, the equations which govern the phase and amplitude of the excitation voltage appearing on the cavity opening are obtained in terms of time t and current modulation strength. Several points are noteworthy from the theoretical analysis. First, amplitude and phase shift of the induced voltage indicate a damping oscillation, whose frequency is proportional to the mismatch {vert_bar}{Delta}{omega}{vert_bar} between the modulation frequency {omega} and the cavity resonance frequency {omega}{sub 0}. Second, rise time of the cavity excitation amplitude decreases as the value of the frequency mismatch increases. Third, for a large value of the frequency mismatch {vert_bar}{Delta}{omega}{vert_bar}, the power transfer from the modulated beam to the cavity occurs at the beginning of the beam pulse. Finally, it is observed that the absolute amount of energy delivered from the beam to the cavity decreases drastically as the frequency mismatch increases.

• OSTI ID: 51843
• Report Number(s): CONF-940142--; ISBN 0-8194-1449-2
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BEAM PROFILES
CAVITY RESONATORS
ELECTRIC POTENTIAL
ENERGY TRANSFER
KLYSTRONS
MATHEMATICAL MODELS
THEORETICAL DATA