Electron tube with reduced secondary emission
AssigneeVarian Associates, Inc.
InventorLouis R. Falce
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Abstract
Secondary electrons emitted from an electron-collecting electrode of a vacuum tube degrade the performance. Emission of high-speed secondaries is reduced by coating the electron-collecting surface with a material of low atomic number. Emission of low-speed secondaries is a less predictable function of the surface material and structure. The invention comprises a coating of aluminum boride or similar substance, which has low secondary emission and is also easy to outgas.
Claims6
An electron tube comprising a copper electrode capable of collecting free electrons, at least a portion of the collecting surface of said electrode being coated with a layer of material of the class consisting of aluminum boride, aluminum carbide and boron carbide.
Dependencies are inferred from the claim text.