Oval sheet beam electron gun

A strip injection and electron gun technology, which is applied in the electron/ion gun of the transit time type electron tube, the cathode of the transit time type electron tube, the focusing arrangement of the transit time type electron tube, etc., can solve the problem of low current density and cathode evaporation. High rate, short service life and other problems, to achieve the effect of improving operating frequency, high current density and long service life

CN102522298AInactive Publication Date: 2012-06-27UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-06-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to an oval sheet beam electron gun, which is used with a travelling wave tube, a backward wave tube and the like. The oval sheet beam electron gun comprises a shell, an electric heating wire in the shell, a cathode component, a focusing electrode component and an anode, wherein an emitting surface of a cathode head of the cathode component is a plane, the focusing electrode component comprises a pyramidal focusing hole, and the anode is positioned at an output port of the shell and provided with an anode hole which is a cylindroid hole. The cathode head is made of lanthanum hexaboride, the emitting surface of the cathode head is modified into a plane, a pyramidal hole with a rectangular axial section is used as the focusing hole, and the cylindroid hole is used as the anode hole, so that the oval sheet beam electron gun has the advantages that the oval sheet beam electron gun is simple in structure and convenient in processing, the precision is easy to be guaranteed, devices are easy to be miniaturized, the production cost is low, current emitted by the cathode head is high in density, operation frequency of the devices and current density of electron beams can be improved effectively, the electron gun is high in output efficiency and long in service life, and the like. The defects of complex structure, low current density and unevenness of the electron beams, high evaporativity and short service life of the cathode in operation at high temperature, and the like in the prior art can be overcome.
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Description

technical field

[0001] The invention belongs to the field of vacuum electronic devices, in particular to an elliptical strip-shaped injection electron gun, which is especially suitable for matching with traveling wave tubes, return wave tubes and the like. Background technique

[0002] With the development of vacuum electronic technology, when the traditional "O" type vacuum electronic device develops to millimeter wave and higher wave band, due to the increase of operating frequency, the size of the device will become smaller and smaller, and the processing will change accordingly. In addition, due to the limitation of the space charge effect, the increase of the current density of such devices is restricted, and their power capacity is bound to be limited, which leads to a sharp decline in the overall performance of the device as the operating frequency increases. Compared with the traditional "O" type vacuum electronic devices, the ribbon injection vacuum electronic devic...

Examples

Embodiment Construction

[0011] In this embodiment, the elliptical strip-shaped injection gun that works with the traveling wave tube and the return wave tube in the miniaturized flat-shaped strip-shaped injection device of 140 GHz is taken as an example: the emitting surface of the cathode head 1-1 is an elliptical plane with a thickness of 1.0 mm, The long axis is 3mm long, the short axis is 1mm long, and the material is lanthanum hexaboride (LaB 6 ), the wall thickness of cathode head fixing cylinder 1-2 is 0.2mm, the long axis is 3mm, the short axis is 1mm, the axial length is 3mm, and the material is metal tantalum. 15mm, the material is metal niobium, the outer heat insulation cylinder 1-4 has a wall thickness of 0.2mm, the inner diameter is 5mm, and the axial length is 14mm, the material is metal niobium, and the cathode component fixing seat 1-5 is fixed in a cylindrical shape with a ring plate in this embodiment Seat, ring plate thickness 0.4mm, outer diameter 20mm, cylindrical fixed seat inn...