CN109559956A - Electron gun for generating elliptical ribbon-like electron beams - Google Patents
Electron gun for generating elliptical ribbon-like electron beams Download PDFInfo
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- CN109559956A CN109559956A CN201710885217.9A CN201710885217A CN109559956A CN 109559956 A CN109559956 A CN 109559956A CN 201710885217 A CN201710885217 A CN 201710885217A CN 109559956 A CN109559956 A CN 109559956A
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- cathode
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- focusing electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/06—Electron or ion guns
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- Electron Sources, Ion Sources (AREA)
Abstract
The invention belong to it is a kind of with travelling-wave tubes, backward wave tube etc. with applying oval strip beam electron gun, it include: shell and the heating wire being set in the housing, the cathode taps surface of emission is the cathode assembly of plane, the focusing electrode component of the focal aperture containing rectangular pyramid and positioned at shell output port, the anode that its anode hole is oval post holes.The invention as cathode taps and by emission of cathode face will be changed to plane using lanthanum hexaboride, at the same use shaft section for the tetragonous taper hole of rectangle as focal aperture, using oval post holes as anode hole；Thus have structure simple, it is easy to process, the features such as precision is easy to guarantee and device is easy to minimize, production cost is low, the current density height of cathode taps transmitting, the output power height of the current density of the working frequency that can effectively improve device and electronics note and electron gun, long service life.The defects of overcoming background technique, structure is complicated, the current density of electronics note is low and uneven, and the evaporation rate for the cathode that works under the high temperature conditions is high, service life is short.
Description
Technical field
The invention belongs to vacuum electron device field, especially a kind of oval strip beam electron gun, the electron gun is especially fitted
Conjunction and travelling-wave tubes, backward wave tube etc., which are matched, applies.
Background technique
With the development of vacuum electronics technology, when traditional " O " type vacuum electron device is to millimeter wave and more high band
When development, due to the increase of working frequency, the size of device will become smaller and smaller, and processing correspondingly just becomes increasingly to be stranded
It is difficult；In addition, the raising of the current density of such devices is restricted, and power capacity must due to the limitation of space charge effect
It is so restricted, and then the overall performance of device is caused to decline with the raising of working frequency and sharply.Relative to traditional " O "
For type vacuum electron device, ribbon beam vacuum electron device have following clear advantage: one since structure is simple, because
And it processes relatively easy；Secondly due to can with lesser size transmit high current, thus have biggish output power；Its
Three, are conducive to expansion interaction region, to raising vacuum electron device since ribbon-like electron is infused closer to high-frequency structure
Efficiency is advantageous.Ribbon beam vacuum electron device is due to above advantages, in the following high-power, high-frequency and miniaturization
There is apparent advantage in development trend, more and more pay close attention to and study so as to cause people.
Currently, the generation of ribbon-like electron note mainly has direct method and indirect method.Direct method is straight using strip beam electron gun
Raw ribbon-like electron of practicing midwifery is infused, and strip beam electron gun is divided into oval strip beam electron gun and rectangular strip shape note electron gun；Indirect method is
Ribbon-like electron is generated plus asymmetric helical lens using circle note electron gun to infuse.Application No. is 200810224901.3, hair
The patent document of bright entitled " a kind of structure of electron gun for generating elliptical ribbon-like electron beams " discloses a kind of suitable for W (75GHz-110GHz)
The oval strip beam electron gun of wave band Sheet beam klystron, the electron gun include: the cathode of oval cylindrical structure, boring
The focusing electrode of elliptical gradient, external run-track shaped structure, anode head and shell.The electron gun is being used for Sheet beam klystron
Although when, in W-waveband have many advantages, such as high-power output, small in size and compact-sized, exist simultaneously: the one invention
Strip beam electron gun designed using Pierre's Si method, the surface of emission of cathode is spill cylinder, thus works as cathode size
When smaller, the current density of the note of electronics produced by spill cylinder cathode will become uneven；Secondly is to match with spill cylinder cathode
The focusing electrode of set, used elliptical gradient, not only structure is complicated, and the Electronic beam focusing emitted for small size cathode
When, its electronics note edge track will intersect, and laminarity is caused to be deteriorated；Thirdly increase of the with frequency, electron gun ruler
Very little to become smaller, the electron gun is higher to the required precision of the oval taper hole of its emission of cathode face, focusing electrode and anode head, ellipse
The difficulty of processing of circular cone hole is big, is unfavorable for the miniaturization of device and the raising of working frequency；Its such electron gun of four, is usually adopted
Make that cathode, not only the current density that emits is low with barium, tungsten material, such as: the operating temperature of tungsten (W) cathode is 2500K~2700K,
Emission is 0.26~1.5A/cm2；The operating temperature of oxide-coated cathode ((BaSrCa) O) be 900K~
1000K, emission are 0.81~5.0A/cm2；Dipped barium-tungsten cathode (BaO-W) operating temperature is 1000K~1200K,
Emission is 0.33~5.1A/cm2, and such cathode works under the high temperature conditions, and the evaporation rate of cathode is high, makes
It is short with the service life.
Summary of the invention
The purpose of the present invention is for defect existing for background technique, a kind of electron gun for generating elliptical ribbon-like electron beams of Curve guide impeller, to reach
To while the high-output power for ensuring electron gun, simplify its structure, be effectively reduced difficulty of processing and production cost, realize device
The current density of part miniaturization, the working frequency for effectively improving device and electronics note, and extend the service life etc. of electron gun
Purpose.
Solution of the invention is emission of cathode face to be changed to plane, simultaneously using axis section in basis of background technology
Face be rectangle tetragonous taper hole as on focusing electrode focal aperture, using oval post holes as anode hole；To ensure electronics
The uniform current density of note and on the basis of improving the current density of electronics note, simplify its structure, difficulty of processing is effectively reduced and
Production cost realizes device miniaturization, improves the working frequency of electron gun, prolong its service life；And using with more forceful electric power
Flow the lanthanum hexaboride (LaB of emissivities6) density of its current emission is improved as the cathode of electron gun；The present invention is i.e. with this
Realize its goal of the invention.Therefore electron gun for generating elliptical ribbon-like electron beams of the present invention includes shell and the heating wire being set in the housing, band yin
The cathode assembly of cartridge, focusing electrode component and the anode with anode hole positioned at shell output port, key are band cathode taps
Cathode assembly further include cathode taps fixed cylinder, connector sleeve and cathode assembly fixing seat equipped with inside and outside heat insulation cylinder, and cathode taps
It is plane for Elliptic Cylinder, its surface of emission；Focusing electrode component includes focusing electrode and its fixed cylinder, focusing electrode group equipped with focal aperture
Part fixing seat, wherein focal aperture is the tetragonous taper hole that shaft section is in rectangle；The anode with anode hole, its anode hole are ellipse
Post holes；Cathode taps in cathode assembly are integrally welded with cathode taps fixed cylinder and pass through connector sleeve and cathode assembly fixing seat
Be fastened together with shell, focusing electrode be secured to cylinder welding after, be fastened together by focusing electrode component fixing seat and shell,
And anode is then fastenedly connected with the output port of shell integrally, heating wire anode connect with the connecting plate being fixed on shell,
And it is connect by the connecting plate with external power.
The cathode taps are Elliptic Cylinder, and the surface of emission (front end face) is plane and, ellipse vertical with electron gun central axes
The thick 0.5-1.5mm of cylinder, long axis 2.5-4.5mm, short axle 0.8-1.2mm, material are lanthanum hexaboride (LaB6).It is described poly-
Jiao Kongwei shaft section is in the tetragonous taper hole of rectangle, and the inclination angle in the tetragonous wide face of taper hole is 25 ° -35 °, leptoprosopy inclination angle is 55 ° -65 °.Institute
Anode hole is stated as oval post holes, the long axis of oval post holes is 2.7-4.7mm, short axle 1-1.4mm.
The present invention is due to using lanthanum hexaboride (LaB6) be used as cathode taps and emission of cathode face will be changed to plane, simultaneously
Use shaft section for the tetragonous taper hole of rectangle as on focusing electrode focal aperture, using oval post holes as anode hole, thus have
Have that structure is simple, easy to process, precision is easy to guarantee and device is easy to minimize, production cost is low, the electric current of cathode taps transmitting
The output power of density height, the current density of the working frequency that can effectively improve device and electronics note and electron gun is high, uses
The features such as service life is long.
Detailed description of the invention
Fig. 1 is the oval strip beam electron gun structure of the present invention and specific embodiment structural schematic diagram (cross-sectional view)；
Fig. 2 is plan view (A-A cross-sectional view).
In figure: 1-1. cathode taps, 1-2. cathode taps fixed cylinder, heat insulation cylinder, 1-4. outer heat insulation cylinder, 1-5. cathode sets in 1-3.
Part fixing seat, 2-1. focusing electrode, 2-2. focusing electrode fixed cylinder, 2-3. focusing electrode component fixing seat, 3-1. (electron gun) anode, 3-
(2. electron gun) anode fixing seat, 4-1. heating wire, 4-2. heating wire connecting plate, 5. shells.
Specific embodiment
Present embodiment is with the travelling-wave tubes in the plate ribbon beam device of miniaturization with 140GHz, backward wave tube auxiliary work
Oval strip beam electron gun for: the cathode taps 1-1 surface of emission be elliptic plane, thickness 1.0mm, long axial length 3mm, the long 1mm of short axle,
Material is lanthanum hexaboride (LaB6), cathode taps fixed cylinder 1-2 wall thickness 0.2mm, long axis 3mm, short axle 1mm, axial long 3mm, material
For metal tantalum, interior heat insulation cylinder 1-3 wall thickness 0.4mm, internal diameter 3mm, axial long 15mm, material are metal niobium, outer heat insulation cylinder 1-4 wall thickness
0.2mm, internal diameter 5mm, axial long 14mm, material are metal niobium, and cathode assembly fixing seat 1-5 present embodiment is using ring plate
Tubular fixing seat, ring flat-plate thickness 0.4mm, outer diameter 20mm, tubular fixing seat internal diameter 8.8mm, axial high 2mm, material are metal niobium；It is poly-
Burnt pole 2-1 radius 5mm, thickness 1mm, the long 3.2mm of tetragonous taper hole inner end rectangular opening, width 1.2mm, the wide face inclination angle of focusing electrode be 30 °, it is narrow
Face inclination angle is 60 °, material is metal molybdenum, and focusing electrode fixed cylinder 2-2 wall thickness 0.4mm, internal diameter 8mm, axial long 14mm, material are gold
Belong to molybdenum, focusing electrode component fixing seat 2-3 present embodiment also uses the tubular fixing seat of ring plate, ring flat-plate thickness 0.4mm, outer diameter
20mm, tubular fixing seat internal diameter 8.8mm, material are metal niobium；(electron gun) anode 3-1 radius 5mm, thickness 1mm, middle part cylindroid
The long axis 3.2mm of anode hole, short axle 1.2mm, material are stainless steel, (electron gun) anode fixing seat 3-2 ring flat-plate thickness 0.2mm, outer
Diameter 23mm, tubular fixing seat internal diameter 20mm, material are kovar alloy, the internal orifice end of present embodiment anode hole and cathode taps 1-1
The distance between surface of emission is 6mm, and heating wire 4-1 power 15W, its cathode are connect with cathode taps 1-1, anode is connect with heating wire
Plate 4-2 connection, 5 internal diameter 15mm of shell, outer diameter 20mm, axial long 30mm, material are 95 insulating ceramics of aluminium oxide.
Present embodiment is tested through simulation run: anode voltage is 20kV, cathode operating temperature is 1800K~2000K
When, cathode taps 1-1 emission is about 12.7A/cm2, line focus pole 2-1 compression, obtaining beam current is 300mA,
It is 90A/cm that electronics, which infuses at waist the electronics note density (along at axial cross section minimum),2, oval electronics note long axis and short axle are divided
It Wei not 3mm and 0.14mm, the i.e. long axis of electronics note and short axle ratio about 21.
Claims (4)
1. a kind of electron gun for generating elliptical ribbon-like electron beams, including shell and the heating wire being set in the housing, the cathode assembly with cathode taps,
Focusing electrode component and the anode with anode hole positioned at shell output port, it is characterised in that the cathode assembly with cathode taps also wraps
Cathode taps fixed cylinder is included, connector sleeve and cathode assembly fixing seat equipped with inside and outside heat insulation cylinder, and cathode taps are Elliptic Cylinder, it
The surface of emission is plane；Focusing electrode component includes the focusing electrode and its fixed cylinder, focusing electrode component fixing seat for being equipped with focal aperture, wherein
Focal aperture is the tetragonous taper hole that shaft section is in rectangle；The anode with anode hole, its anode hole are oval post holes；Cathode assembly
In cathode taps and cathode taps fixed cylinder it is integrally welded and be tightened to one with shell by connector sleeve and cathode assembly fixing seat
Body, focusing electrode be secured to cylinder welding after, be fastened together by focusing electrode component fixing seat and shell, and anode then with shell
Output port be fastenedly connected integrally, heating wire anode connect with the connecting plate being fixed on shell and passes through the connecting plate
It is connect with external power.
2. by electron gun for generating elliptical ribbon-like electron beams described in claim 1, it is characterised in that the cathode taps are Elliptic Cylinder, its transmitting
Face is plane and, thick 0.5-1.5mm, long axis 2.5-4.5mm, the short axle 0.8- of Elliptic Cylinder vertical with electron gun central axes
1.2mm, material are lanthanum hexaboride.
3. by electron gun for generating elliptical ribbon-like electron beams described in claim 1, it is characterised in that the focal aperture is shaft section in rectangle
Tetragonous taper hole, the inclination angle in the tetragonous wide face of taper hole is 25 ° -35 °, leptoprosopy inclination angle is 55 ° -65 °.
4. by electron gun for generating elliptical ribbon-like electron beams described in claim 1, it is characterised in that the anode hole is oval post holes, oval
The long axis of post holes is 2.7-4.7mm, short axle 1-1.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710885217.9A CN109559956A (en) | 2017-09-26 | 2017-09-26 | Electron gun for generating elliptical ribbon-like electron beams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710885217.9A CN109559956A (en) | 2017-09-26 | 2017-09-26 | Electron gun for generating elliptical ribbon-like electron beams |
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| Publication Number | Publication Date |
|---|---|
| CN109559956A true CN109559956A (en) | 2019-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710885217.9A Pending CN109559956A (en) | 2017-09-26 | 2017-09-26 | Electron gun for generating elliptical ribbon-like electron beams |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114678241A (en) * | 2020-12-24 | 2022-06-28 | 中国电子科技集团公司第十二研究所 | Insulating support piece for electron gun and electron gun |
-
2017
- 2017-09-26 CN CN201710885217.9A patent/CN109559956A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114678241A (en) * | 2020-12-24 | 2022-06-28 | 中国电子科技集团公司第十二研究所 | Insulating support piece for electron gun and electron gun |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190402 |
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| WD01 | Invention patent application deemed withdrawn after publication |