Abstract
ABSTRACT The effect of the anode aperture in conical flow Pierce guns is investigated by moans of first-order perturbation theory. Expressions are derived for the perturbation of the path, for the change in current density across the cathode and elsewhere across the beam, the loss in perveance, and the change in beam diameter and the focal length associated with the anode lens. The various perturbations are computed for a gun which, according to Pierce's theory, has a perveance of 3·25 × 10−6. Computed perturbations are compared with those obtained by experiment on a gun which was specially constructed to test the theory. There is good agreement between theoretical and experimental data.
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