Analysis of the electromagnetic waves in an overmoded finite length slow wave structure

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Date
1995-04Author
Amin, Rahul
Ogura, K.
Kitamura, H.
Minami, K.
Watanabe, T.
Carmel, Y.
Main, W.
Weaver, J.
Destler, William
Granatstein, V.
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Show full item recordAbstract
The electromagnetic fields of the higher order axial
resonant modes in a slow wave structure are analyzed and found
to have considerably different characteristics from those of the
conventional fundamental mode. Here, the reflections at both
ends produce axial resonant modes corresponding to axisymmetric
transverse magnetic (TM) modes. The period of field
modulation of some of the higher order axial modes is shorter
than that of the usual mode in a cylindrical waveguide, which
could be of practical interest for higher power, higher frequency
operation of backward wave oscillators. A perturbation technique
is used to ascertain the field distribution inside the resonant
cavity, and the numerical results thus obtained are compared
to some experimental data.
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