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Efficiency enhancement of coupled-cavity TWT's through cavity resonance taperingThe paper examines efficiency enhancement of coupled-cavity traveling-wave tube (TWT) through cavity resonance tapering. Beam-wave resynchronization through circuit velocity reduction is used for TWT efficiency enhancement, with circuit velocity reduction in coupled cavity TWT's accomplished through period tapering. However, the amount of the latter is limited by the stability considerations, so that beyond a critical value of velocity reduction, the tube may be subject to zero drive oscillations originating in the velocity taper region. The coupled-cavity resonance tapering allows the velocity reduction to continue beyond the limit of stable period tapering, and it is accomplished by a gradual reduction in the cavity resonance frequency, with the period and the circuit bandwidth unchanged. The advantages of cavity resonance tapering vs period tapering are discussed, and test data are presented with the results of large-signal computer calculations. It is shown that cavity resonance tapering can produce efficiencies as period tapering without incurring the same risk of lower band-edge oscillations.
Document ID
19800029730
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Connolly, D. J.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1979
Publication Information
Publication: IEEE Transactions on Electron Devices
Volume: ED-26
Subject Category
Electronics And Electrical Engineering
Accession Number
80A13900
Distribution Limits
Public
Copyright
Other

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