Electron beam generator comprising an electron emitting device adapted to emit an electron beam when heated to an elevated temperature, wherein the electron emitting device comprises a filament having a spiral portion.

The present invention generally relates to systems and methods for generating controllable beam of electrons using a hollow-cathode triode electron gun that substantially mitigate impact of back-streaming electrons. In one embodiment, a triode hollow-cathode electron gun is configured to provide electrons and substantially mitigates the impact of back-streaming electrons. The triode hollow-cathode electron gun includes a hollow cathode, a heating filament, an anode, a control grid, a shadow grid and a sleeve mechanically coupled to the hollow-cathode. The sleeve is substantially centered on the axis of the triode hollow-cathode electron gun and configured to maintain shape and trajectory of emitted beams of electrons.

The present invention generally relates to systems and methods for generating controllable beam of electrons using a hollow-cathode triode electron gun that substantially mitigate impact of back-streaming electrons. In one embodiment, a triode hollow-cathode electron gun is configured to provide electrons and substantially mitigates the impact of back-streaming electrons. The triode hollow-cathode electron gun includes a hollow cathode, a heating filament, an anode, a control grid, a shadow grid and a sleeve mechanically coupled to the hollow-cathode. The sleeve is substantially centered on the axis of the triode hollow-cathode electron gun and configured to maintain shape and trajectory of emitted beams of electrons.

A filament assembly can include: a button having a planar emitter region with one or more apertures extending from an emission surface of the planar emitter region to an internal surface opposite of the emission surface; an inlet electrical lead coupled to the button at a first side; an outlet electrical lead coupled to the button at a second side opposite of the first side; and a low work function object positioned adjacent to the internal surface of the planar emitter region and retained to the button. The planar emitter region can include a plurality of apertures. The low work function object can include a porous ceramic material having the barium, and may have a polished external surface. An electron gun can include the filament assembly. An additive manufacturing system can include the electron gun having the filament assembly.

An electron beam projector with a linear thermal cathode (7) for electron beam heating consists of a beam guide (1) which comprises a deflecting electromagnetic system (2) and accommodates an accelerating anode (3) fixed on it by a posts (10), where anode is connected by a high-voltage insulators (4) through a cathode plate (5) to a cathode assembly (6), that includes the linear thermal cathode (7) fastened in a cathode holders (8), and a focusing electrode (9). The accelerating anode (3) comprises a plate (11) rigidly fastened to it for hermetical separation of the cathode (7) and the beam guide (1) parts of the projector, wherein the common optical axis of a cathode assembly (6) and the accelerating anode (3) is deflected from a beam guide optical axis by an angle a that is equal to 1030.

An electron beam projector with a linear thermal cathode (7) for electron beam heating consists of a beam guide (1) which comprises a deflecting electromagnetic system (2) and accommodates an accelerating anode (3) fixed on it by a posts (10), where anode is connected by a high-voltage insulators (4) through a cathode plate (5) to a cathode assembly (6), that includes the linear thermal cathode (7) fastened in a cathode holders (8), and a focusing electrode (9). The accelerating anode (3) comprises a plate (11) rigidly fastened to it for hermetical separation of the cathode (7) and the beam guide (1) parts of the projector, wherein the common optical axis of a cathode assembly (6) and the accelerating anode (3) is deflected from a beam guide optical axis by an angle a that is equal to 1030.

The present disclosure relates to a manufacturing method for an electron emitting device using a graphite adhesive material. A method of preparing paste for forming a cathode of an electron emitting device includes: mixing and dispersing a nanomaterial for electron emission and a graphite filler in a solvent; drying a mixed solution in which the nanomaterial and the graphite filler are mixed; and preparing paste by mixing a graphite binder with the dried mixture.

The present disclosure relates to a manufacturing method for an electron emitting device using a graphite adhesive material. A method of preparing paste for forming a cathode of an electron emitting device includes: mixing and dispersing a nanomaterial for electron emission and a graphite filler in a solvent; drying a mixed solution in which the nanomaterial and the graphite filler are mixed; and preparing paste by mixing a graphite binder with the dried mixture.

Electron beam generator comprising an electron emitting device adapted to emit an electron beam when heated to an elevated temperature, wherein the electron emitting device comprises a filament having a spiral portion.

Electron beam generator comprising an electron emitting device adapted to emit an electron beam when heated to an elevated temperature, wherein the electron emitting device comprises a filament having a spiral portion.