Theoretical and experimental studies are presented on a coaxial cavity with an external focusing mirror and an internal grating of cylindrical or conical shape. Expressions are derived for the amplitudes of the incident wave and of the spatial harmonics. Patterns have been derived for the distributions of radially propagating modes with various numbers of half-waves along the zaxis. Measurements have been made on the slow-wave properties of a cylindrical diffraction grating in the cavity.
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