Means and method for suppressing oscillations in electron guns
AssigneeVarian Associates, Inc.
InventorsGeorge V. Miram, Gordon T. Hunter
Life of this patent
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Abstract
A method and apparatus for preventing oscillations in high-current electron guns. Spurious oscillations frequently occur as a result of interaction of the electron stream with the fields of resonant modes of the gun structure. The resonant impedances of the modes are lowered by damping with lossy dielectric or resistive materials which are suited to the high temperature and vacuum environment of electron guns. The lossy materials are located in places shielded from high electric fields applied to the gun. Lossy dielectric materials which are D.C. insulators may be used as insulating supports for gun electrodes.
Claims7
An electron gun comprising a plurality of electrodes shaped to generate a stream of electrons and direct said stream emergent from said gun, support means positioning said electrodes said support means including a member of direct current dielectric material forming an insulating support between two of said electrodes for maintaining a fixed spaced relationship therebetween, said material presenting high loss at radio frequencies so as to reduce the resonant impedance of at least one electromagnetic mode of said electrodes and said support means, said mode comprising fields interacting with the electron stream.
Dependencies are inferred from the claim text.