CN103094019A - Filament used for microcurrent electronic gun - Google Patents
Filament used for microcurrent electronic gun Download PDFInfo
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- CN103094019A CN103094019A CN2013100210240A CN201310021024A CN103094019A CN 103094019 A CN103094019 A CN 103094019A CN 2013100210240 A CN2013100210240 A CN 2013100210240A CN 201310021024 A CN201310021024 A CN 201310021024A CN 103094019 A CN103094019 A CN 103094019A
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- filament
- microcurrent
- diameter
- electronic gun
- electron emission
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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
The present invention relates to a kind of filament, especially a kind of filament for little current electrons rifle belongs to the accelerator gun technical field.
Background technology
At present, the voltage of controlling the electron gun filament two ends is normally adopted in the control of the accelerator scanning line size of producing both at home and abroad, thereby the method that changes the anode electron emission amount realizes.Due to the continuous expansion of accelerator application, require accelerator not only can stablize the little electric current of emission, also want to stablize the size of controlling little electric current.
But preceding method can not be stablized the little electric current of emission below tens microamperes, and because the diameter of filament is larger, surface area is corresponding increase also, and namely the surface of emission of electronics increases.When the filament heating temperature does not reach work function, can not electron emission; When reaching work function, the large tracts of land emission forms large line.And when just reaching work function, because of the smile fluctuation of filament supply, electric current is disturbed, and when electronics is overflowed, intrinsic fluctuation causes emission current extremely unstable.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of filament for little current electrons rifle, the electron emission amount of the control filament of voltage stabilization that can be by adjusting filament two ends, thus realize control to the accelerator line.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of filament for little current electrons rifle, the material of described filament are tungsten, and the middle part diameter diminishes gradually.
Aforesaid filament for little current electrons rifle is characterized in that: the diameter at described filament two ends is 0.15mm-0.2mm, and it is 0.12mm-0.16mm that diameter is the most carefully located at the middle part.
Aforesaid filament for little current electrons rifle is characterized in that: the middle part of described filament is bent into waveform.
Aforesaid filament for little current electrons rifle is characterized in that: the centre position of described filament is bent into most advanced and sophisticated projection.
The invention has the beneficial effects as follows:
1, filament adopts tungsten as raw material, because its emission effciency is low, is conducive to the control of electronic beam current;
2, by reducing the surface area of filament, make electron emission amount reduce by two orders of magnitude;
3, by changing shape and the structure of filament, form middle part and the larger temperature gradient in edge, thereby form and progressively enlarge electron emission area with the increase of glower end voltage, most advanced and sophisticated overshooting shape can form point-like trace emission at first, very easily be accelerated electric field and draw, thereby reach from several microamperes to hundreds of stable in a microampere and the almost control of linearity.
Description of drawings
Fig. 1 is the filament structural representation during bending not that the present invention is used for little current electrons rifle;
Fig. 2 is the structural representation after filament middle part that the present invention is used for little current electrons rifle is bent into waveform;
Fig. 3 is the structural representation after filament middle part that the present invention is used for little current electrons rifle is bent into most advanced and sophisticated projection.
Embodiment
Below in conjunction with Figure of description, the present invention is described further.
As shown in Figure 1, a kind of filament for little current electrons rifle, the material of described filament is tungsten, and the middle part diminishes diameter by polishing gradually, the diameter at described filament two ends is 0.15mm-0.2mm, and it is 0.12mm-0.16mm that diameter is the most carefully located at the middle part, and the length of filament is reduced in original 1/2nd, because the emission effciency of tungsten is low, be conducive to the control of electronic beam current; By reducing the surface area of filament, make electron emission amount reduce by two orders of magnitude; By the polishing to the filament middle part, form middle part and the larger temperature gradient in edge, progressively enlarge electron emission area thereby form with the increase of glower end voltage, be conducive to control the size of electronic beam current.
As shown in Figure 2, the middle part of filament is bent into waveform, and its crooked degree can suitably be adjusted according to the length of filament, thereby makes the electron emission amount of filament easier to be controlled.
As shown in Figure 3, the centre position of filament is bent into most advanced and sophisticated projection, and most advanced and sophisticated overshooting shape can form point-like trace emission at first, very easily is accelerated electric field and draws, thereby reach from several microamperes to hundreds of stable in a microampere and the almost control of linearity.
In sum, a kind of filament for little current electrons rifle provided by the invention, the electron emission amount of the control filament of voltage stabilization that can be by adjusting filament two ends, thus realize control to the accelerator line.
Above demonstration and described basic principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is by appending claims and equivalent circle thereof.
Claims (4)
1. filament that is used for little current electrons rifle, it is characterized in that: the material of described filament is tungsten, and the middle part diameter diminishes gradually.
2. the filament for little current electrons rifle according to claim 1 is characterized in that: the diameter at described filament two ends is 0.15mm-0.2mm, and it is 0.12mm-0.16mm that diameter is the most carefully located at the middle part.
3. the filament for little current electrons rifle according to claim 1 and 2, it is characterized in that: the middle part of described filament is bent into waveform.
4. the filament for little current electrons rifle according to claim 1 and 2, it is characterized in that: the centre position of described filament is bent into most advanced and sophisticated projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100210240A CN103094019A (en) | 2013-01-21 | 2013-01-21 | Filament used for microcurrent electronic gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100210240A CN103094019A (en) | 2013-01-21 | 2013-01-21 | Filament used for microcurrent electronic gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103094019A true CN103094019A (en) | 2013-05-08 |
Family
ID=48206469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100210240A Pending CN103094019A (en) | 2013-01-21 | 2013-01-21 | Filament used for microcurrent electronic gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103094019A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106449341A (en) * | 2016-11-01 | 2017-02-22 | 桂林狮达机电技术工程有限公司 | Electronic gun filament heating current automatic tuning method based on constant grid bias voltage |
| CN113990729A (en) * | 2021-10-28 | 2022-01-28 | 郑州航空工业管理学院 | Quasi-macroscopic cold field emission electron gun and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4220889A (en) * | 1978-03-01 | 1980-09-02 | Commissariat A L'energie Atomique | Cathode for an electron gun |
| US4473771A (en) * | 1980-06-20 | 1984-09-25 | Universite Laval | Thermionic emitter for electron microscopy |
| CN1503309A (en) * | 2002-11-14 | 2004-06-09 | ���µ����ʽ���� | Predicting the lifetime of a filament in an ion source device |
-
2013
- 2013-01-21 CN CN2013100210240A patent/CN103094019A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4220889A (en) * | 1978-03-01 | 1980-09-02 | Commissariat A L'energie Atomique | Cathode for an electron gun |
| US4473771A (en) * | 1980-06-20 | 1984-09-25 | Universite Laval | Thermionic emitter for electron microscopy |
| CN1503309A (en) * | 2002-11-14 | 2004-06-09 | ���µ����ʽ���� | Predicting the lifetime of a filament in an ion source device |
Non-Patent Citations (1)
| Title |
|---|
| 程宏昌 等: "《微通道板(MCP)电子清刷用电子枪的设计》", 《应用光学》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106449341A (en) * | 2016-11-01 | 2017-02-22 | 桂林狮达机电技术工程有限公司 | Electronic gun filament heating current automatic tuning method based on constant grid bias voltage |
| CN113990729A (en) * | 2021-10-28 | 2022-01-28 | 郑州航空工业管理学院 | Quasi-macroscopic cold field emission electron gun and manufacturing method thereof |
| CN113990729B (en) * | 2021-10-28 | 2023-06-06 | 郑州航空工业管理学院 | Quasi-macroscopic cold field emission electron gun and manufacturing method thereof |
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Application publication date: 20130508 |