Filament used for microcurrent electronic gun

An electron gun and micro-current technology, applied in the filament field, can solve problems such as unstable emission current and achieve low emission efficiency

Inactive Publication Date: 2013-05-08
CGN DASHENG ELECTRON ACCELERATOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, when the work function is just reached, the current is disturbed due to the slight fluctuation of the filament power supply, and the inherent fluctuation when the electrons escape causes the emission current to be extremely unstable.

Method used

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  • Filament used for microcurrent electronic gun
  • Filament used for microcurrent electronic gun
  • Filament used for microcurrent electronic gun

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Experimental program
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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, a filament for a micro-current electron gun, the material of the filament is tungsten, and the diameter of the middle part is gradually reduced by grinding, the diameter of the two ends of the filament is 0.15mm-0.2mm, and the diameter of the thinnest part of the middle part is 0.12mm-0.16mm, reducing the length of the filament to less than half of the original, because the emission efficiency of tungsten is low, which is beneficial to the control of the electron beam current; by reducing the surface area of ​​the filament, the electron emission can be reduced by two orders of magnitude ; By grinding the middle of the filament, a larger temperature gradient between the middle and the edge is formed, thereby gradually expanding the electron emission area with the increase of the filament terminal voltage, which is beneficial to control ...

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Abstract

The invention discloses a filament used for a microcurrent electronic gun. The filament is made of tungsten, the diameter of the middle of the filament gradually lessens, the diameter of two ends of the filament is 0.15mm-0.2mm, and the diameter of the thinnest position of the middle of the filament is 0.12mm-0.16mm. The filament used for the microcurrent electronic gun solves the problem that beam current size of the microcurrent electronic gun cannot be accurately controlled in the prior art, and enables electron emission quantity to be reduced of two order of magnitudes through decreasing of the superficial area of the filament. Through changing of the shape and structure of the filament, large temperature gradients of the middle portion and edges are formed, and thus an electron emission area is gradually enlarged along with the increase of voltage of a filament end. A tip protuberance shape can form the earliest punctiform trace emission which is quite easy to educe out by an accelerating field, and thus stable and nearly linear control from a few microamps to hundreds of microamps is achieved.

Description

technical field [0001] The invention relates to a filament, in particular to a filament used for a micro-current electron gun, and belongs to the technical field of accelerator electron guns. Background technique [0002] At present, the control of the scanning beam current of accelerators produced at home and abroad is usually achieved by controlling the voltage at both ends of the filament of the electron gun, thereby changing the amount of electrons emitted by the anode. Due to the continuous expansion of the application field of the accelerator, it is required that the accelerator can not only emit micro-current stably, but also control the magnitude of the micro-current stably. [0003] However, the aforementioned method cannot stably emit a microcurrent of less than tens of microamperes, because the diameter of the filament is larger, and the surface area is correspondingly increased, that is, the emission surface of electrons is increased. When the heating temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/16
Inventor 胡志荣
Owner CGN DASHENG ELECTRON ACCELERATOR TECH
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