CN201348979Y - Electron gun structure for linear accelerator - Google Patents
Electron gun structure for linear accelerator Download PDFInfo
- Publication number
- CN201348979Y CN201348979Y CNU2008201804787U CN200820180478U CN201348979Y CN 201348979 Y CN201348979 Y CN 201348979Y CN U2008201804787 U CNU2008201804787 U CN U2008201804787U CN 200820180478 U CN200820180478 U CN 200820180478U CN 201348979 Y CN201348979 Y CN 201348979Y
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- electron gun
- linear accelerator
- cathode
- negative electrode
- center
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Abstract
The utility model relates to an electron gun for a linear accelerator, belonging to the field of medical appliances. The electron gun comprises a cathode control component provided with a projectile cathode, an electron gun shell, an anode positioned above the cathode and a cover plate positioned under the cathode; wherein the projectile cathode is a cylinder having a concave surface on the top and a through hole in the center, and the concave surface on the top is a hollow impregnated barium-tungsten coating layer cathode; and a control grid electrode is arranged above the cathode. The electron gun has long service life and the parameters are in accordance with the requirements of the linear accelerator for the electron gun in the medical facilities.
Description
Technical field
The utility model belongs to medical instruments field, specially refers to the electron gun structure that is used for medical standing wave linac.
Background technology
Medical standing wave linac is the core component that is used for the desirable radiotherapy apparatus of production for treating deep tumor.The medical standing wave linac that domestic radiotherapy apparatus uses depends on mostly from external import.Domestic have few scientific research institutions also to introduce and develop linear accelerator, but the problem that inevitably has the electron back bombardment negative electrode because of linear accelerator, electronics directly bombards on the cathode surface, cause the temperature of cathode surface to raise, cause the active material of emission to evaporate in a large number, shorten cathode life greatly.Thereby feed through to linear accelerator useful life, make the radiotherapy apparatus cisco unity malfunction, need often to change whole linear accelerator.The work of hospital is impacted increase with use cost.Therefore the life-span of the electron gun of linear accelerator is the key factor that influences the accelerator life-span.
Summary of the invention
Technical problem to be solved in the utility model is, the negative electrode that uses at prior art cathetus accelerator gun is unable to bear electron back bombardment, reduction of service life, in order to overcome this drawback, will redesign a kind of electron gun that can tolerate electron back bombardment, the purpose of this utility model provides a kind of electron gun structure that is used for linear accelerator, the both anti-electron back bombardment of this electron gun, and electronics is annotated and radio-frequency field interaction efficiency height, is easy to change.
The technical scheme that the utility model technical solution problem adopts is, the electron gun that a kind of linear accelerator is used, include emitter cathodes at interior the moon control assembly, electron gun shell, be positioned at the anode above the negative electrode and be positioned at cover plate below the negative electrode, it is characterized in that, described emitter cathodes is that a top is the cylindrical drum that concave shape, center are a through hole shape, be hollow dipping barium tungsten overlay film layer negative electrode on its top concave surface, this negative electrode top is provided with the control grid.
Wherein the relative position of the shape of the curvature of the diameter of emitter cathodes, concave surface, control utmost point shape, anode and each electrode calculates through data and formula in the test of electronics notes trace simulation and obtains.
In order to improve the intensity of electronic gun cover plate, the thickness of cover plate increases to 1mm by 0.6mm.
The utility model compared with prior art, changed the structure of overlay film barium dipped cathode, in the middle of negative electrode, opened a through hole, make back Hong most of electronics directly not bombard on the cathode surface, beat on the cover plate of electron gun but pass negative electrode, the heat that electron bombard produces distributes by the cover plate of electron gun.Avoided a large amount of and returned Hong electron bombard to negative electrode, made the negative electrode intensification and cathode life is reduced.The hollow cathode mid portion does not have the electronics emission, and electron beam is through after focusing on, and the electron density at edge is greater than the electron density at center.When radio-frequency field and electron beam positive energy exchange, so the peripheral electron interaction of main and electron beam is for the electron beam of same total current, the efficient height of the electron beam of hollow cathode and the mutual effect of radio-frequency field.Curvature, control utmost point shape, the shape of anode and the accurate calculating and the optimization of relative position process of each electrode by anticathode diameter, cathode surface, the laminarity of the electron beam that is produced by electron gun is good, range is long, and the distance of annotating to electronics from the center of cathode surface with a tight waist is not less than 22mm.Annotate the waist radius and be not more than 0.69mm.Total perveance is 0.41 μ P.The long service life of the design's electron gun, parameter meet linear accelerator requirement to electron gun in Medical Devices.
Description of drawings
Fig. 1 is used for the electron gun structure schematic diagram of linear accelerator for the utility model.
Embodiment
With reference to Fig. 1, represent the described electron gun structure schematic diagram that is used for linear accelerator, cloudy control assembly 1 among the figure, it comprises a cylindrical drum that is the through hole shape, be hollow dipping barium tungsten overlay film layer negative electrode 1-1 on its top concave surface, this negative electrode top is provided with control grid 1-2, adopts the dipped barium-tungsten cathode of Φ 7.2mm in this assembly, be provided with the through hole of 1 Φ 2.5mm in cathode center, through hole is the bottom from the cathode emission surface to negative electrode.Cloudy control assembly 1, anode 3 are assembled together by electron gun shell 2 precisions.The central through hole of cloudy control assembly 1 directly and the center of electron gun bottom 4.Behind good this bottom 4 of welding, whole accelerator gun links to each other with the cavity of accelerator by anode, has guaranteed the concentricity of electron gun and cavity.Be connected together by argon arc toe on the electron gun shell 2 and the argon arc welding side weld on the accelerating tube cavity then, guaranteed the vacuum-tightness of housing.This rifle structure has just become the core component of linear accelerator Medical Devices.
Claims (4)
1, the electron gun used of a kind of linear accelerator, include emitter cathodes at interior the moon control assembly, electron gun shell, be positioned at the anode above the negative electrode and be positioned at cover plate below the negative electrode, it is characterized in that, described emitter cathodes is that a top is the cylindrical drum that concave shape, center are a through hole shape, be hollow dipping barium tungsten overlay film layer negative electrode on its top concave surface, this negative electrode top is provided with the control grid.
2, a kind of linear accelerator electron gun that is used for according to claim 1 is characterized in that, the emitter cathodes in the described cloudy control assembly is the dipped barium-tungsten cathode that adopts Φ 7.2mm, is provided with the through hole of 1 Φ 2.5mm in cathode center.
3, a kind of linear accelerator electron gun that is used for according to claim 1 is characterized in that, the central through hole of cloudy control assembly directly and the center of electron gun bottom.
4, a kind of electron gun that is used for linear accelerator according to claim 1 is characterized in that, the annexation of described electron gun and linear accelerator is by the anode location, guarantees the concentricity with the linear accelerator cavity; Connect by argon arc toe on the electron gun shell and the argon arc welding side weld on the accelerating tube cavity, guarantee the vacuum-tightness of housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201804787U CN201348979Y (en) | 2008-12-03 | 2008-12-03 | Electron gun structure for linear accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201804787U CN201348979Y (en) | 2008-12-03 | 2008-12-03 | Electron gun structure for linear accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201348979Y true CN201348979Y (en) | 2009-11-18 |
Family
ID=41368446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201804787U Expired - Fee Related CN201348979Y (en) | 2008-12-03 | 2008-12-03 | Electron gun structure for linear accelerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201348979Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928278A (en) * | 2014-03-14 | 2014-07-16 | 大连交通大学 | High energy electronic gun |
| CN105225917A (en) * | 2014-11-19 | 2016-01-06 | 北京航空航天大学 | A kind of ion trap device and method reducing the pollution of straight type gun cathode |
| CN105657952A (en) * | 2015-12-16 | 2016-06-08 | 舟山雷大电子科技有限公司 | Electron linear accelerator diode electron gun with replaceable cathode |
| CN105762053A (en) * | 2016-04-20 | 2016-07-13 | 沈阳伊贝姆科技有限公司 | Plasma source of electrons and ions |
| CN108766858A (en) * | 2018-08-07 | 2018-11-06 | 核工业理化工程研究院 | The positioning device and electron gun of column electron gun with high temperature cathode |
| CN112735933A (en) * | 2019-10-28 | 2021-04-30 | 新日本无线株式会社 | Electron gun and method for manufacturing electron gun |
| CN113078039A (en) * | 2021-03-30 | 2021-07-06 | 上海联影医疗科技股份有限公司 | Electron gun device and medical linear accelerator |
-
2008
- 2008-12-03 CN CNU2008201804787U patent/CN201348979Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928278A (en) * | 2014-03-14 | 2014-07-16 | 大连交通大学 | High energy electronic gun |
| CN105225917A (en) * | 2014-11-19 | 2016-01-06 | 北京航空航天大学 | A kind of ion trap device and method reducing the pollution of straight type gun cathode |
| CN105657952A (en) * | 2015-12-16 | 2016-06-08 | 舟山雷大电子科技有限公司 | Electron linear accelerator diode electron gun with replaceable cathode |
| CN105657952B (en) * | 2015-12-16 | 2018-04-03 | 舟山雷大电子科技有限公司 | A kind of replaceable electron linear accelerator diode gun of negative electrode |
| CN105762053A (en) * | 2016-04-20 | 2016-07-13 | 沈阳伊贝姆科技有限公司 | Plasma source of electrons and ions |
| CN105762053B (en) * | 2016-04-20 | 2018-08-14 | 沈阳伊贝姆科技有限公司 | Plasma source of electrons and ions |
| CN108766858A (en) * | 2018-08-07 | 2018-11-06 | 核工业理化工程研究院 | The positioning device and electron gun of column electron gun with high temperature cathode |
| CN112735933A (en) * | 2019-10-28 | 2021-04-30 | 新日本无线株式会社 | Electron gun and method for manufacturing electron gun |
| CN113078039A (en) * | 2021-03-30 | 2021-07-06 | 上海联影医疗科技股份有限公司 | Electron gun device and medical linear accelerator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091118 Termination date: 20131203 |