Accuracy of the equivalent circuit model using a fixed beam impedance for klystron gain cavities

Most small-signal calculations of the modulation in a klystron's gain cavity use an equivalent circuit which includes a fixed beam impedance. Comparing this calculation to the gain calculated self-consistently, we note there are appreciable errors in both the calculated amplitude and phase of t...

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Bibliographic Details
Published in:IEEE transactions on plasma science 1998-12, Vol.26 (6), p.1745-1749
Main Authors: Carlsten, B.E., Ferguson, P., Sprehn, D.
Format: Article
Language:English
Subjects:
Amplitude modulation
Applied sciences
Cavity resonators
Circuit simulation
Electronic tubes, masers
Electronics
Equivalent circuits
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Impedance
Klystrons
Laser optical systems: design and operation
Microwave tubes (eg, klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
Numerical analysis
Numerical simulation
Optical modulation
Optics
Phase modulation
Physics
Plasma
Resonators, cavities, amplifiers, arrays, and rings
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Summary:Most small-signal calculations of the modulation in a klystron's gain cavity use an equivalent circuit which includes a fixed beam impedance. Comparing this calculation to the gain calculated self-consistently, we note there are appreciable errors in both the calculated amplitude and phase of the cavity's modulation. These errors may lead to large accumulated errors in determining either the tube's small-signal or large-signal gain. Both techniques are used in a comparison with an existing S-band klystron.
ISSN:0093-3813
1939-9375
DOI:10.1109/27.747895