CN202633200U - Cathode control bipolar electron gun for standing wave accelerating tube - Google Patents
Cathode control bipolar electron gun for standing wave accelerating tube Download PDFInfo
- Publication number
- CN202633200U CN202633200U CN 201220258524 CN201220258524U CN202633200U CN 202633200 U CN202633200 U CN 202633200U CN 201220258524 CN201220258524 CN 201220258524 CN 201220258524 U CN201220258524 U CN 201220258524U CN 202633200 U CN202633200 U CN 202633200U
- Authority
- CN
- China
- Prior art keywords
- hole
- electron gun
- poles
- cover plate
- wave accelerating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Particle Accelerators (AREA)
Abstract
The utility model provides a cathode control bipolar electron gun for a standing wave accelerating tube. The electron gun comprises a shell, a cathode control component positioned in the shell, and an anode and a cover plate, which are positioned at the two ends of the shell respectively. The cathode control component is a cylinder with a center hole in which a cathode is arranged. A focusing electrode is arranged on the upper part of the cathode control component. A through hole I is formed in the center of the anode, and comprises an upper cylindrical hole and a lower circular truncated cone-shaped hole. A cylindrical through hole II is reserved in the center of the cathode. The cylindrical hole in the through hole I and the through hole II are concentric, and have an equal diameter of 1.8 to 2.2mm. When electron back bombardment is generated, electrons with diameters smaller than that of the cylindrical hole in the through hole I enter the through hole II of the cathode after passing through the anode, so that the cathode can be directly prevented from back bombardment electrons, the back bombardment electrons directly impact on the cover plate at the lower end of the shell, and heat generated by the electron back bombardment is directly dissipated through the cover plate to effectively avoid the influence of the back bombardment electrons on the cathode.
Description
Technical field
The utility model relates to a kind of electron gun, and especially a kind of resident wave accelerating pipe is with cloudy control the two poles of the earth electron gun.
Background technology
In the 6MeV medical electron linear accelerator; Because the restriction in accelerating tube installation site and space; Require the accelerating tube size to be issued to higher energy and output dose requirement in short as far as possible prerequisite, in order to reach this requirement, the measure that can take from the accelerating tube aspect is exactly the accelerating gradient that improves the accelerating tube accelerating structure; Along with accelerating gradient is increasingly high, accelerating tube just is easy to generate the electron back bombardment phenomenon.The power of electron back bombardment mainly concentrates on the cathode center zone; Electron back bombardment can make on the one hand negative electrode work long hours under improper temperature and shorten negative electrode useful life; Simultaneously; Influence the stability of emission current owing to the gun cathode temperature raises, cause the fluctuation of emission current in the accelerating tube course of work, thereby influence the stability of medical accelerator ray index.In resident wave accelerating pipe; Raising along with accelerating gradient; The negative effect that the electron back bombardment problem is caused is more and more obvious, and the electron back bombardment phenomenon is a kind of harmful but phenomenon that can't eliminate fully, only takes optimized Measures to reduce back to bang to play certain effect from the accelerating tube structural design; But along with the raising of accelerating gradient, the electron back bombardment phenomenon can not be eliminated very fully.Existing in prior technology weak point that Here it is.
Summary of the invention
The technical problem that the utility model will solve is exactly not enough to existing in prior technology, and provides a kind of counnter attack Hong resident wave accelerating pipe with cloudy control the two poles of the earth electron gun.
This programme is realized through following technical measures: anode and cover plate that this resident wave accelerating pipe comprises housing, is positioned at the moon control assembly of housing and lays respectively at the housing two ends with cloudy control the two poles of the earth electron gun; Said cloudy control assembly is the cylindrical drum that has centre bore; Be provided with negative electrode in the cylindrical drum, the top of cloudy control assembly is provided with focusing electrode; Wherein, anodes centre is provided with the through hole I, and the through hole I comprises the cylindrical hole on top and the truncated cone-shaped hole of bottom, and the center of negative electrode has columniform through hole II; Concentric and the equal diameters of cylindrical hole in the through hole I and through hole II, the span of its diameter is 1.8～2.2mm.
In order to reach better counnter attack Hong effect, making the cylindrical hole diameter in the above-mentioned through hole I is 2mm, like this; When electron back bombardment; Only let diameter pass through with interior Hong the electron beam that returns, thereby filter a part of electronics of diameter, reduced time Hong amount of electrons greater than 2mm at 2mm.At this moment, the diameter of through hole II also is 2mm.
The binding post that above-mentioned hull outside is provided with the binding post locating ring and links to each other with locating ring; The line pressing bolt that is mated is arranged in the binding post, and through the line pressing bolt anchored filament, this fixed form has been avoided the caducous defective of scolding tin in the welding fixed form; Both simple, safety, firm again.
End near anode in the above-mentioned housing is fixedly connected with argon arc welding flange I, and electron gun welds together through the argon arc welding flange on argon arc welding flange I and the accelerating tube cavity, has guaranteed the air-tightness in the electron gun use.
Above-mentioned argon arc welding flange I is connected with collector through the argon arc welding flange II that is fixedly connected with it; When electron gun does not use, argon arc welding flange I and argon arc welding flange II are welded together, anode and negative electrode are in the vacuum environment; Prevent that anode and negative electrode from placing air oxidized and influence its serviceability for a long time; To make things convenient for the preservation of electron gun, before the use, can test the performance of electron gun through collector.During use, argon arc welding flange I and argon arc welding flange II are separated, and the argon arc welding flange on argon arc welding flange I and the accelerating tube cavity is welded together.
Above-mentioned cover plate is the kovar alloy cover plate, and its thickness is 1.1mm, to strengthen the intensity of electron gun.
The through hole II of above-mentioned negative electrode and the center of cover plate return Hong electronics and directly beat on the cover board through after the through hole II, and the heat that produces in this process can in time dissipate through cover plate.
Above-mentioned negative electrode is the dipped barium-tungsten cathode of diameter in the 6.4-6.5mm scope, under the as far as possible little situation of diameter, enough emission currents is arranged to guarantee negative electrode, thus the structure space of compression of electronic rifle as much as possible.
The upper edge of above-mentioned housing is 36-38mm to the axial distance of the lower edge of cover plate, and the diameter of housing is 33-35mm, makes this electron gun overall dimensions little, and shared space proportion is little, thereby has shortened accelerating pipe length effectively, with convenient perfusion silica gel.
The beneficial effect of this programme can learn that this resident wave accelerating pipe is with in the electron gun of cloudy control the two poles of the earth according to the narration to such scheme, and said cloudy control assembly is the cylindrical drum that has centre bore, is provided with negative electrode in the centre bore, and the top of cloudy control assembly is provided with focusing electrode; Wherein, anodes centre is provided with the through hole I, and the through hole I comprises the cylindrical hole on top and the truncated cone-shaped hole of bottom; The center of negative electrode has columniform through hole II, when this version of through hole I makes the electronics emission, is beneficial to electronics and gets into the through hole I in a large number; And during electron back bombardment; Make electronics touch the end that blocking surface is big, the aperture is little earlier, can filter a part of electronics to the greatest extent, more to reduce back Hong amount of electrons; Concentric and the equal diameters of cylindrical hole in the through hole I and through hole II, the span of its diameter is 1.8～2.2mm.When producing electron back bombardment; Diameter less than the electronics of cylindrical hole in the through hole I through getting into the through hole II of negative electrode behind the anode; Thereby make negative electrode directly avoid back the electronics in Hong past, the electronics in Hong past is directly beaten on the cover plate of housing lower end, the heat that electron bombard produces directly distributes through cover plate; Effectively avoided time Hong the anticathode influence of electronics; Under the prerequisite that does not change the accelerating tube high acceleration gradient, reduce the injury that the electron back bombardment target causes, thereby prolonged the useful life of negative electrode, guaranteed the stability of the output dose and the energy of accelerating tube.This shows that the utility model compared with prior art has substantive distinguishing features and progress, the beneficial effect of its enforcement also is conspicuous.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the structural representation of anode among Fig. 1.
Among the figure, 1 is anode, and 2 are argon arc welding flange II, and 3 are argon arc welding flange I, and 4 is focusing electrode; 5 is negative electrode, and 6 is cloudy control assembly, and 7 is cover plate, and 8 is filament; 9 is housing, and 10 is line pressing bolt, and 11 is binding post, and 12 is the truncated cone-shaped hole; 13 is cylindrical hole, and 14 is collector, and 15 is the through hole II, and 16 is locating ring.
Embodiment
For clearly demonstrating the technical characterstic of this programme, below through embodiment, and combine its accompanying drawing, this programme is set forth.
A kind of resident wave accelerating pipe is with cloudy control the two poles of the earth electron gun; As depicted in figs. 1 and 2, it comprises housing 9, be positioned at the moon control assembly 6 of housing 9 and lay respectively at the anode 1 and the kovar alloy cover plate 7 at housing 9 two ends, and the thickness of cover plate 7 is 1.1mm; Said cloudy control assembly 6 is for having the cylindrical drum of centre bore; Be provided with the dipped barium-tungsten cathode 5 of diameter in the 6.4-6.5mm scope in the centre bore, preferably the diameter of this negative electrode 5 is 6.43mm, and the top of cloudy control assembly 6 is provided with focusing electrode 4; Wherein, anode 1 center is provided with the through hole I, and the through hole I comprises the cylindrical hole 13 on top and the truncated cone-shaped hole 12 of bottom, and the center of negative electrode 5 has columniform through hole II 15, the center of through hole II 15 and cover plate 7; Cylindrical hole 13 in the through hole I and through hole II 15 concentric and equal diameters, the span of its diameter is 1.8～2.2mm, the cylindrical hole 13 in the preferred through hole I and the diameter of through hole II 15 are 2mm.
In addition; The kovar alloy binding post 11 that housing 9 arranged outside have kovar alloy binding post locating ring 16 and link to each other with locating ring 16; The line pressing bolt 10 that is mated is arranged in the binding post 11, and antianode is connected to negative high voltage during use, negative electrode 5 outer rings around filament 8 be negative electrode 5 heating; So that negative electrode 5 ability normal transmission electronics, this fixed form has been avoided the caducous defective of scolding tin in the welding fixed form.
End near anode 1 in the housing 9 is fixedly connected with kovar alloy argon arc welding flange I 3, and argon arc welding flange I 3 is connected with collector 14 through the kovar alloy argon arc welding flange II 2 that is fixedly connected with it.When electron gun does not use, argon arc welding flange I 3 and argon arc welding flange II 2 are welded together, just anode 1 is in the vacuum environment with negative electrode 5 all the time, prevents that anode 1 and negative electrode 5 from placing air for a long time and oxidized, is beneficial to the preservation of electron gun; Before the use, can test through the performance of 14 pairs of electron guns of collector.When electron gun uses; With cutting tool argon arc welding flange I 3 and argon arc welding flange II were opened in 2 minutes; And this argon arc welding flange I 3 and argon arc welding flange on the accelerating tube cavity welded together; Electron gun is connected with cavity in the accelerating tube through anode 1, has both guaranteed the vacuum-tightness in accelerating tube cavity and the electron gun housing 9, can guarantee the concentricity of electron gun and accelerating tube cavity again.
The radiuses, the radius of curvature of negative electrode 5, the focusing electrode 4 of electron gun etc. of through hole I that the electronics of this electron gun from the outer electrode to the electron gun annotated radius, the anode 1 of smallest cross-sectional radius, emitter cathodes 5 all adopt the CAD method design; Calculate and optimization through accurate, whole electron gun structure is compact, and the upper edge of housing 9 is 36-38mm to the axial distance (being the height of electron gun) of the lower edge of cover plate 7; Be preferably 38mm; The diameter of housing 9 is 33-35mm, is preferably 35mm, annotates the waist radius and is not more than 0.5mm; Negative electrode 5 emission J ≈ 1.5A/cm2, total perveance is 0.3uP.The electron gun overall dimensions is little, and shared space proportion is little, thereby has shortened accelerating pipe length effectively, with convenient perfusion high pressure silica gel.The electron beam laminarity that this electron gun produces is good, and range is long, and the electronic beam current emission is stable.
When negative electrode 5 emitting electrons, electronics gets into the accelerating tube cavity through anode 1, and the truncated cone-shaped hole 12 in the through hole I of anode 1 is beneficial to a large amount of electronics gatherings and gets in the cylindrical hole 13; When producing the electron back bombardment phenomenon; Electronics at first touches the cylindrical hole 13 in the through hole I of anode 1; Because cylindrical hole 13 is big than the blocking surface in truncated cone-shaped hole 12, the aperture is little; So anode 1 can filter the electronics of diameter greater than the diameter of its cylindrical hole 13, thereby reduced time Hong amount of electrons effectively.Because the through hole II 15 of negative electrode 5 and the center of cover plate 7; So returning Hong electronics can directly beat on cover plate 7; The heat that produces in this process directly dissipates through cover plate 7, works long hours under improper temperature and influences its performance and useful life to prevent negative electrode 5.
Can pass through existing techniques in realizing without the technical characterictic of describing in the utility model, repeat no more at this.
Claims (10)
1. a resident wave accelerating pipe is with cloudy control the two poles of the earth electron gun; It comprises housing, be positioned at the moon control assembly of housing and lay respectively at the anode and the cover plate at housing two ends; It is characterized in that: said cloudy control assembly is the cylindrical drum that has centre bore; Be provided with negative electrode in the cylindrical drum, the top of cloudy control assembly is provided with focusing electrode; Wherein, anodes centre is provided with the through hole I, and the through hole I comprises the cylindrical hole on top and the truncated cone-shaped hole of bottom, and the center of negative electrode has columniform through hole II; Concentric and the equal diameters of cylindrical hole in the through hole I and through hole II, the span of its diameter is 1.8～2.2mm.
2. resident wave accelerating pipe according to claim 1 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: the cylindrical hole in the said through hole I and the diameter of through hole II are 2mm.
3. resident wave accelerating pipe according to claim 1 and 2 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: the binding post that said hull outside is provided with the binding post locating ring and links to each other with locating ring has the line pressing bolt that is mated in the binding post.
4. resident wave accelerating pipe according to claim 1 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: the end near anode in the said housing is fixedly connected with argon arc welding flange I.
5. resident wave accelerating pipe according to claim 4 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: said argon arc welding flange I is connected with collector through the argon arc welding flange II that is fixedly connected with it.
6. resident wave accelerating pipe according to claim 4 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: said cover plate is the kovar alloy cover plate, and its thickness is 1.1mm.
7. resident wave accelerating pipe according to claim 1 is characterized in that: the through hole II of said negative electrode and the center of cover plate with cloudy control the two poles of the earth electron gun.
8. resident wave accelerating pipe according to claim 1 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: said negative electrode is the dipped barium-tungsten cathode of diameter in the 6.4-6.5mm scope.
9. resident wave accelerating pipe according to claim 1 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: the upper edge of said housing is 36-38mm to the axial distance of the lower edge of cover plate.
10. resident wave accelerating pipe according to claim 1 is with cloudy control the two poles of the earth electron gun, and it is characterized in that: the diameter of said housing is 33-35mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258524 CN202633200U (en) | 2012-06-04 | 2012-06-04 | Cathode control bipolar electron gun for standing wave accelerating tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220258524 CN202633200U (en) | 2012-06-04 | 2012-06-04 | Cathode control bipolar electron gun for standing wave accelerating tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202633200U true CN202633200U (en) | 2012-12-26 |
Family
ID=47386361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220258524 Expired - Lifetime CN202633200U (en) | 2012-06-04 | 2012-06-04 | Cathode control bipolar electron gun for standing wave accelerating tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202633200U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US10950407B2 (en) | 2019-06-12 | 2021-03-16 | New Japan Radio Co., Ltd. | Electron gun |
| GB2590457A (en) * | 2019-12-19 | 2021-06-30 | Elekta ltd | Radiotherapy device |
| US11437214B2 (en) | 2019-10-28 | 2022-09-06 | New Japan Radio Co., Ltd. | Electron gun and manufacturing method therefor |
-
2012
- 2012-06-04 CN CN 201220258524 patent/CN202633200U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US10950407B2 (en) | 2019-06-12 | 2021-03-16 | New Japan Radio Co., Ltd. | Electron gun |
| US11437214B2 (en) | 2019-10-28 | 2022-09-06 | New Japan Radio Co., Ltd. | Electron gun and manufacturing method therefor |
| GB2590457A (en) * | 2019-12-19 | 2021-06-30 | Elekta ltd | Radiotherapy device |
| GB2590457B (en) * | 2019-12-19 | 2023-10-11 | Elekta ltd | Radiotherapy device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202633200U (en) | Cathode control bipolar electron gun for standing wave accelerating tube | |
| CN101521135B (en) | Grid-control nanocarbon cathode field emission X-ray pipe | |
| CN205793593U (en) | Micro logging neutron tube | |
| WO2010002610A3 (en) | Thermionic emitter designed to control electron beam current profile in two dimensions | |
| TW200501191A (en) | X-ray source employing a compact electron beam accelerator | |
| CN107768218A (en) | A kind of low energy high current grided electron gun | |
| CN201348979Y (en) | Electron gun structure for linear accelerator | |
| CN202857121U (en) | Grid-control electronic gun applicable to linear accelerator | |
| CN201378580Y (en) | Gate-controlled carbon nano-cathode field emission X-ray tube | |
| CN202634872U (en) | 6MeV single-photon medical low-energy standing wave accelerating tube | |
| CN110072325A (en) | A kind of high current ion high voltage static accelerating tube | |
| CN103413745B (en) | A kind of grid-control cold cathode X-ray tube | |
| CN106373844B (en) | Collector porcelain cylinder on multi-level depressurization collector and the collector for including the porcelain cylinder | |
| CN110534388A (en) | A kind of cathode optical texture of miniature micro- focal spot x-ray tube | |
| CN202634871U (en) | 6MeV single-photon medical low-energy accelerating tube | |
| CN201138653Y (en) | Bimodule multi-pouring travelling-wave tube grid controlled electronic gun | |
| CN202888118U (en) | Rod control electronic gun structure used for dual mode travelling wave tube | |
| CN212230388U (en) | High dose yield circumferential irradiation ray tube | |
| CN105414732B (en) | More cathode electronics gun apparatus | |
| CN103839739B (en) | Cathode electron source | |
| CN204516717U (en) | A kind of grid-control cold cathode X-ray tube | |
| CN201032623Y (en) | X-ray tubes | |
| CN102711359A (en) | Single-photon 6MeV medical low-energy standing-wave accelerating tube | |
| CN209418459U (en) | Ion averager electron source | |
| CN103000479B (en) | Novel electronic gun |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |