Transient behavior of cavity excitation driven by a modulated electron beam

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870784· OSTI ID:6691872

Uhm, H S ^[1]

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1. Naval Surface Warfare Center, 10901 New Hampshire Avenue, White Oak, Silver Spring, Maryland 20903-5640 (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 [ital 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: 6691872
• Journal Information: Physics of Plasmas; (United States), Journal Name: Physics of Plasmas; (United States) Vol. 1:4; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
AMPLIFIERS
BEAMS
CAVITIES
ELECTRON BEAMS
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
EXCITATION
KLYSTRONS
LEPTON BEAMS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
PARTICLE BEAMS
PHASE SHIFT
PLASMA
RELATIVISTIC PLASMA
TRANSIENTS