CN2203803Y - Directly-heated linear electron gun - Google Patents
Directly-heated linear electron gun Download PDFInfo
- Publication number
- CN2203803Y CN2203803Y CN 94212892 CN94212892U CN2203803Y CN 2203803 Y CN2203803 Y CN 2203803Y CN 94212892 CN94212892 CN 94212892 CN 94212892 U CN94212892 U CN 94212892U CN 2203803 Y CN2203803 Y CN 2203803Y
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- China
- Prior art keywords
- spring
- electron
- electrode
- bunching
- main cathode
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- 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 - Fee Related
Links
- 229910052573 porcelain Inorganic materials 0.000 claims description 12
- 238000012856 packing Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000010894 electron beam technology Methods 0.000 abstract description 11
- 229910052770 Uranium Inorganic materials 0.000 abstract description 5
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract description 5
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000011900 installation process Methods 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 229910000691 Re alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000011981 development test Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002784 hot electron Substances 0.000 description 1
- DECCZIUVGMLHKQ-UHFFFAOYSA-N rhenium tungsten Chemical compound [W].[Re] DECCZIUVGMLHKQ-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- Electron Sources, Ion Sources (AREA)
Abstract
The utility model discloses a linear electron gun of directly-heated, including the positive pole of electron with higher speed, be located the spotlight utmost point of positive pole below focus electron and establish two parallels in the spotlight utmost point, have the linear negative pole that reverse current passes through each other, two negative poles of saying are the main negative pole that can send the thermoelectron and the supplementary negative pole as conductive loop of arranging for separating from top to bottom respectively, and two negative poles concatenate each other, and main negative pole one end is fixed, and the other end still links there is the spring straightener. The electron gun has good linearity and bunching property of the emitted electron beam, and the cathode installation process is simple and convenient, and can be used as an evaporation source of uranium of the laser separation axis isotope.
Description
The utility model relates to a kind of electron gun, is specifically a kind ofly can send the linear electron bundle, as the directly-heated type linear electron rifle of separation by laser uranium isotope uranium evaporation source.
The U.S., France and Japan and other countries are used the evaporation source of high power e molded lines electron gun as uranium in the laboratory and the pilot plant of atom vapor method separation by laser uranium isotope at present.The flat 2-213036 of Japanese publication patent discloses a kind of line style electron gun, it comprises that at least two parallel have having that backward current passes through to send thermionic negative electrode mutually, are used for focusing on and are emitted thermionic bunching electrode and be used for quickening to be emitted thermionic anode.This electron gun adopts the twin cathode structure, send hot electron simultaneously, and have backward current to pass through in the twin cathode mutually, can eliminate of the influence of negative electrode self-field effectively to the electron beam focusing performance, but realize side by side two cathode filaments lean on the linearity of very recent raising electron beam, two cathode filaments are separated each other, make two negative electrodes form the loop, there is reverse convection current to pass through mutually, eliminate the influence of negative electrode self-field to the electron beam focusing performance, this is to be difficult to realize on the mounting process of cathode filament.
The purpose of this utility model provides a kind of electron beam linearity and good condensing performance sent, the directly-heated type linear electron rifle that the cathode filament mounting process is easy.
The utility model is achieved in that a kind of directly-heated type linear electron rifle, it comprises the anode that accelerated electron is used, being positioned at anode below is used for the bunching electrode of focused electron and is located at two parallel wire the moon plates that have backward current to pass through mutually of bunching electrode, wherein said two filamentary cathodes are respectively arranged apart up and down can send thermionic main cathode and as the auxilliary negative electrode of galvanic circle, main cathode and auxilliary negative electrode are connected in series.
The utility model has the advantages that main and auxiliary negative electrode is arranged apart up and down, be convenient to install respectively connection, have only the main cathode divergent bundle, have favorable linearity, auxilliary negative electrode is connected in series with main cathode, and be parallel to each other, form the galvanic circle, after two negative electrodes insert the filament heating power supply, have backward current to pass through mutually, eliminate of the influence of negative electrode self-field, make the electron beam focusing good the electron beam focusing performance.
Now in conjunction with the accompanying drawings and embodiments the utility model is done specific descriptions:
Fig. 1 is the utility model structural representation;
Fig. 2 is vertical end view of the present utility model.
As shown in Figure 1, a kind of directly-heated type linear electron rifle comprises the anode 1 that accelerated electron is used, be positioned at the bunching electrode 2 of anode 1 below focused electron, be located at that having in the bunching electrode 2 are sent thermionic main cathode 3 and as the auxilliary negative electrode 4 of galvanic circle, main cathode 3 and auxilliary negative electrode 4 are parallel to each other, separate each other, both are connected in series, when the free termination filament heating power supply 5 of main cathode 3 and auxilliary negative electrode 4, article two, negative electrode has backward current to pass through mutually, 2 of anode 1 and bunching electrodes are connected to the accelerating power source 6 of DC high-voltage power supply as electronics, the positive pole of accelerating power source 6 and anode 1 ground connection, negative pole connects bunching electrode 2, makes bunching electrode 2 keep negative high voltage, bunching electrode 2 and main, auxilliary negative electrode 3,4 equipotentials.
As shown in Figure 2, anode 1 is supported on the base plate 36 by metal mainstay 33 and 30.Bunching electrode 2 bottom sides are provided with bunching electrode base plate 22, this base plate 22 is bearing on porcelain insulating post 34 and 31, be respectively equipped with dirtproof cover 32 and 29 outside the porcelain insulating post 34 and 31, also can be provided with packing ring 21,23 at bunching electrode base plate 22 and 32,29 of dirtproof covers, porcelain insulating post 34 and 31 is bearing on the base plate 36.Wherein anode 1, bunching electrode 2, bunching electrode base plate 22 are made metal mainstay 33 and 30, packing ring 21,23 and base plate 36 by molybdenum and are become by copper.Experimental study shows, except the negative electrode self-field to the electron beam focusing performance influential, negative electrode is subjected to thermal stretching under the hot operation state, and negative electrode and bunching electrode relative position can be changed, this variation also will have a strong impact on the linearity and the focusing of electron beam.The negative electrode that sends electronics for solution is subjected to thermal stretching, guarantees that the relative position of main cathode 3 in bunching electrode 2 is constant, and main cathode 3 one ends are fixed, and the other end is connected with a spring stretcher, and the mechanical pulling force that utilizes spring to add is stretching main cathode 3.In the present embodiment, an end of bunching electrode 2 is provided with main cathode support 26 and auxilliary cathode anchor 27, is respectively equipped with filament heating power supply binding post 24 and 25 on the support 26 and 27, is used to connect cathode filament heating power supply 5.Two stands 26,27 is bearing on the base plate 36 by porcelain insulating post 28.The other end of bunching electrode 2 is provided with the fixture block 18 that is connected with bunching electrode 2 insulation, and fixture block 18 two ends are provided with porcelain insulating packing ring 19 and 20, and support 26 and 27, fixture block 18 are made by molybdenum.Main cathode 3 is the tungsten-rhenium alloy silk of φ 1, and auxilliary negative electrode 4 is the pure tungsten bar of φ 3, and main cathode 3 centers to auxilliary negative electrode 4 centre distances are 4mm.Auxilliary negative electrode 4 one ends insulation is passed main cathode support 26 and is connected with its support 27, and the other end is connected with fixture block 18.Main cathode 3 one ends are connected with its support 26, other end slip is passed fixture block 18 and is connected with a spring stretcher, this spring stretcher comprises the support 12 that is located at bunching electrode 2 other ends, with support 12 be slidingly connected the axle 13, axle 13 has block and vertical threaded bore near an end of main cathode 3, the other end has bolt and nut 7, the screw jacket of axle 13 has porcelain tube 10, the porcelain tube 10 outer compression springs 9 that are with, 9 on support 12 and spring, 9 on nut 7 and spring are provided with porcelain packing ring 11 and 8, make spring 9 heat insulation with axle 13, the other end of main cathode 3 is by bolt 14, nut 17, plain washer 15, spring washer 16 is fixed on the axle 13, and support 12 is bearing on the base plate 36 by porcelain insulating post 35.Support 12, axle 13 are made by molybdenum, and compression spring 9 is 70 steel, and line directly be 1.5mm, and internal diameter is 11mm, and drift is 36.5mm, and number of total coils is 8.25 to enclose.The electron gun that main cathode 3 adds the spring stretcher is called spring gun, and spring gun has solved the key issue of the long filament temperature distortion of main cathode, thereby makes beam spot straight, edge clear; The bundle spot width narrows down, and the bundle spot width is not more than 5mm when not adding the spring stretcher, and the electrical power utilance is very low, has added spring stretcher posterior cord spot width less than 2mm, and under equal-wattage, power density improves greatly, reaches 10kw/cm
2, improved the utilance of electrical power greatly.Development test is further illustrated in that the negative electrode degree of depth and bunching electrode width are two most important, the most responsive parameters in the many structural parameters of electron gun.Under identical cathode filament temperature, the negative electrode degree of depth (distances at bunching electrode 2 surfaces to main cathode 3 centers) increases, the shielding action of bunching electrode antianode electric field is strengthened, driving electric field (referring to be penetrated into the anode electric field of cathode surface) weakens, thereby cause cathode surface emission and total beam to descend, negative electrode obviously weakens to the electric field of pack polar region simultaneously, the aspect makes bunching electrode that line active force and action time are increased again in addition, add weakening of space charge effect, the converging action to electron beam is strengthened.The bunching electrode width increases, make on the one hand negative electrode more " exposure " in anode electric field, driving electric field increases, thereby make cathode emission current density, total beam and space charge effect increase, aspect bunching area internal electric field strengthens in addition, and bunching electrode disperses electron beam to weakening to some extent the action time of the converging action power of electronics with space charge effect more, so it is very important selecting the suitable negative electrode degree of depth and bunching electrode width, in the present embodiment, negative electrode degree of depth h=1.8mm, bunching electrode width d=3.4mm, all the other parameters, as bunching electrode Zhiyang anode-cathode distance, anode width, anode thickness etc. are also insensitive, the influence of halved tie shape is little, anode 1 thickness is 1mm in the present embodiment, and anode width is 3.9mm, and bunching electrode 2 to 1 distance of anode is 2mm.
Claims (3)
1, a kind of directly-heated type linear electron rifle, it comprises the anode (1) that accelerated electron is used, the bunching electrode (2) that is positioned at anode (1) below focused electron be located at bunching electrode (2) two filamentary cathode (3), (4) parallel, that have backward current to pass through mutually, it is characterized in that said two filamentary cathodes (3) and (4) are respectively the main cathode that can send electronics (3) arranged apart up and down and as the auxilliary negative electrode (4) of galvanic circle, main cathode (3) and auxilliary negative electrode (4) are connected in series.
2, according to the said a kind of directly-heated type linear electron rifle of claim 1, an end that it is characterized in that main cathode (3) is fixed on the set support (26) of bunching electrode (2) one ends, the other end is connected with the spring stretcher, this spring stretcher comprises the support (12) that is located at bunching electrode (2) other end, with support (12) be slidingly connected the axle (13), axle (13) has block and vertical threaded bore near an end of main cathode (3), the other end has screw rod, nut (7), the screw jacket of axle (13) has porcelain tube (10), the outer compression spring (9) that is with of porcelain tube (10), support (12) and spring (9), be equipped with porcelain packing ring (11) and (8) between nut (7) and spring (9), the other end of main cathode (3) is by bolt (14), nut (17), plain washer (15), spring washer (16) is fixed on the axle (13), and support (12) is bearing on the base plate (36) by insulated column (35).
3,, it is characterized in that the distance at said bunching electrode (2) surface to main cathode (3) center, i.e. negative electrode degree of depth h=1.8mm, bunching electrode width d=3.4mm according to claim 1 or 2 said a kind of directly-heated type linear electron rifles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94212892 CN2203803Y (en) | 1994-06-03 | 1994-06-03 | Directly-heated linear electron gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94212892 CN2203803Y (en) | 1994-06-03 | 1994-06-03 | Directly-heated linear electron gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2203803Y true CN2203803Y (en) | 1995-07-19 |
Family
ID=33829609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94212892 Expired - Fee Related CN2203803Y (en) | 1994-06-03 | 1994-06-03 | Directly-heated linear electron gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2203803Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103839739A (en) * | 2012-11-26 | 2014-06-04 | 上海联影医疗科技有限公司 | Cathode electron source |
| 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 |
| CN112074926A (en) * | 2018-05-29 | 2020-12-11 | 科磊股份有限公司 | Space charge insensitive electron gun design |
-
1994
- 1994-06-03 CN CN 94212892 patent/CN2203803Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103839739A (en) * | 2012-11-26 | 2014-06-04 | 上海联影医疗科技有限公司 | Cathode electron source |
| CN112074926A (en) * | 2018-05-29 | 2020-12-11 | 科磊股份有限公司 | Space charge insensitive electron gun design |
| CN112074926B (en) * | 2018-05-29 | 2024-05-07 | 科磊股份有限公司 | Space charge insensitive electron gun design |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |