| 摘要 |
FIELD: electricity.SUBSTANCE: in an assembly of an electrovacuum instrument with a field-emission cathode, which is arranged inside a vacuum cover, includes at least one cell including a control electrode with potential U, which is arranged on a dielectric plate, on which there formed in series is a dielectric layer and an emitter layer with potential U, which form a multilayer field-emission structure, and an opposite plate with an anode having potential U, the cell includes an additional control electrode with potential U, which is separated from the emitter with the dielectric layer, and a protective electrode with potential U, which is separated from the additional control electrode with the dielectric layer, a system of capacitors of electric field intensity in the form of nanosized structures from conducting and/or dielectric material, which are located on the emitter surface free from the dielectric layer, with that, the control electrode is located outside the multilayer field-emission structure, potentials in the emission mode meet the system of set ratios, and space between control electrodes and anodes is a zone for formation of an electron stream and its transport from emitters to anodes.EFFECT: protection of emitters against ion bombardment owing to eliminating focusing of ions on the point of emitters, providing interception of ions and improving the structure of the formed flow of field electrons.3 cl, 5 dwg |
