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Circuits for Traveling-Wave Tubes

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1 Author(s)
J. R. Pierce ; Bell Telephone Laboratories, Inc., New York, N.Y.

The comparison between traveling-wave-tube circuits of different geometries can be facilitated by the use of phase velocity, group velocity, and stored energy as parameters. For a given stored energy per unit length, lowering the group velocity with respect to the phase velocity increases circuit impedance (and, hence, gain), increases attenuation, and narrows the band. A filter-type circuit consisting of pillbox resonators is shown to be much inferior electrically to a helix. Expressions are presented showing the effect of gap length in filter-type circuits consisting of pillbox resonators, and the attenuation is calculated for such circuits.

Published in:

Proceedings of the IRE  (Volume:37 ,  Issue: 5 )