CN106816349B - A kind of direct current photocathode ultra-fast electron gun - Google Patents
A kind of direct current photocathode ultra-fast electron gun Download PDFInfo
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- CN106816349B CN106816349B CN201710012788.1A CN201710012788A CN106816349B CN 106816349 B CN106816349 B CN 106816349B CN 201710012788 A CN201710012788 A CN 201710012788A CN 106816349 B CN106816349 B CN 106816349B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/026—Eliminating deleterious effects due to thermal effects, electric or magnetic field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/021—Electron guns using a field emission, photo emission, or secondary emission electron source
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/027—Construction of the gun or parts thereof
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Abstract
The present invention provides a kind of photocathode ultra-fast electron gun, wherein, the cathode is axially symmetric structure, including the first cylindrical sides, rounded bottom surface and the first joint face for connecting first cylindrical sides and the rounded bottom surface, the center of the rounded bottom surface has light hole, and the outside of the rounded bottom surface has the circular groove for accommodating metal film, the anode is axially symmetric structure, including circular top surface, second cylindrical sides, circular ring shape bottom surface, and connect the circular top surface and the second joint face of second cylindrical sides, the lower edge of the circular ring shape bottom surface from second cylindrical sides extends radially outwardly, the circle end face center has through hole, first joint face has rounded corners, and second joint face has oval chamfering.
Description
Technical field
The invention belongs to photoinjectors field more particularly to a kind of direct current photocathode ultra-fast electron guns.
Background technology
Photoinjectors are by laser excitation cathode material, and the photoelectron of generation is applied in the height of two interpolar of negative and positive
Pressure accelerates, and a kind of device of sample detection is then carried out with the high energy electron generated.Electron beam has certain energy, certain line
And speed and angle.Due to the presence of Cyberspace repulsive force, electron beam can be broadened during sample is drifted to, and be led
Send a telegraph the reduction of beamlet time resolution.Due to relativistic effect, high energy electron beam can effectively weaken a coulomb broadening effect, separately
Outside, photoelectron abjection cathode also needs to overcome the sucking action of image charge.For the fixed electron beam of space length, electron energy
Higher, the Electron Beam Drift time cycle is shorter, and the time precision of experimental detection is higher.Therefore, gun cathode is added in principle
It is the bigger the better with the voltage on anode, place electric field is accelerated to be the bigger the better.However, excessively high voltage can locally exceed material sheet
The voltage breakdown threshold value of body, makes electron gun discharge, and can not work.Therefore, the DC electronic rifle general work voltage used at present
In 60keV-80keV or so.The ultra-fast electron gun of general higher voltage then needs radio frequency to accelerate to obtain.
Direct current photocathode ultra-fast electron gun obtains very brief electronic impulse using ultraviolet excitation photoelectron.At present, it is domestic
The DC electronic rifle deposited all is to transmit mode of excitation using laser, due to penetration depth very little of the ultraviolet light in metal film
(ten nanometer scales), blocked up metal film will substantially reduce electron yield, this is current transmitted electron rifle solitary electron quantity
The main reason for small；Thinned metal film increases transmission laser intensity, though this can improve electron yield to a certain extent, gold
Belong to film easily to damage, reduce the stability of electron gun.
When electron gun works, electric discharge is had once in a while, and excessive short circuit current flow can not only make electron gun in electric discharge
Ambient electron product may also be influenced into damage by ground wire to work.In addition, the process is often with electromagnetic radiation, it also can be to electricity
Sub- product damages.Therefore, how discharge prevention is improved, is a major issue of electron gun design.
The content of the invention
Therefore, it is an object of the invention to overcome above-mentioned prior art the defects of, provides a kind of photocathode ultra-fast electron gun,
Including cathode, the anode shape construction determined by electric field program analog result, so as to which traditional photoinjectors are stablized work
It is improved as voltage to 100kV；For ensure electric field be symmetrically and evenly distributed with launching electronics beam diameter used to quality it is special same
Axis fixed form；Reflective mode operation of the increased electron gun under laser pumping for raising solitary electron yield；And even
It is connected to the high voltage power supply of the cathode, discharge prevention, switching.Wherein,
The cathode is axially symmetric structure, including the first cylindrical sides, rounded bottom surface and connection first cylinder
Shape side and the first joint face of the rounded bottom surface, the center of the rounded bottom surface have light hole and the circular base
The outside in face has the circular groove for accommodating metal film,
The anode is axially symmetric structure, including circular top surface, the second cylindrical sides, circular ring shape bottom surface and connection
Second joint face of the circle top surface and second cylindrical sides, the circular ring shape bottom surface is from second cylindrical side
The lower edge in face extends radially outwardly, and the circle end face center has through hole.
Wherein, according to computer program electric Field Optimization analog result, under the electron gun requirement of this kind of structure, described first connects
Junction has rounded corners, and the radius of the rounded corners is greater than or equal to the rounded bottom surface of the cathode and the circle of the anode
The distance between shape top surface, second joint face have oval chamfering, and the long axis of the ellipse chamfering is greater than or equal to
The distance between circular top surface of the rounded bottom surface of the cathode and the anode.According to electron beam computer program analog result,
It is required that electric field is symmetrical, the electron gun has the mounting structure of special guarantee coaxial-symmetrical
Photocathode ultra-fast electron gun according to the present invention, it is preferable that further include the cathode substructure of the fixed cathode.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that tool on the inside of the openend of first cylindrical sides
There is protruding portion, the cathode substructure is the hollow cylinder of one end open one end closing, and the open end of the hollow cylinder has energy
Enough card slots engaged with the protruding portion, the center of the blind end of the hollow cylinder have light hole.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that further include the hollow disk of the fixed anode.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that the face where the outermost edge of the hollow disk is
Cambered surface.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that the circle of the rounded bottom surface of the cathode and the anode
The distance between shape top surface is 8mm.
Photocathode ultra-fast electron gun according to the present invention, further includes lasing light emitter, for the metal film to be excited to generate electronics.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that the circle that the laser of the lasing light emitter transmitting passes through cathode
The center light hole of shape bottom surface reaches the metal film.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that further include speculum, the speculum is by the laser
The laser reflection of source transmitting by the through hole of the anode and reaches the metal film.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that the inside of the circular top surface of the anode has groove,
The through hole of the anode is arranged in the groove.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that there is the magnetic shield panel of perforate at the top of the electron gun.
Photocathode ultra-fast electron gun according to the present invention, it is preferable that connect between the high voltage power supply and gun cathode
Big resistance, resistance value are 1/10th to 1 percent of system resistance value before series connection.
The chamfer design of the photocathode ultra-fast electron gun of the present invention eliminates point discharge that may be present, prevents surface office
Portion's electric field increase, makes traditional photoinjectors stable operating voltage be promoted to 100kV, the special structure of electron gun and fixation
Mode ensure that electric fields uniform is symmetrically distributed, and shield external interference, it is ensured that the symmetrical quality of the electron beam of generation, separately
Outside, the thickness of the metal film of the electron gun of reflective-mode can reach micron to millimeter magnitude, overcome current transmitted electron rifle
The problem of solitary electron quantity is small improves the stability of electron gun.Ultimately providing a kind of anode and cathode can be steady in 100kV or so
Fixed work, electric field are symmetrically and evenly distributed, and solitary electron yield can reach the photocathode ultra-fast electron gun of million magnitudes.
Description of the drawings
Embodiments of the present invention is further illustrated referring to the drawings, wherein：
Fig. 1 is the exploded perspective view according to the electron gun of the embodiment of the present invention；
Fig. 2 is the section view along the central axis AA ' of Fig. 1 electron guns according to embodiments of the present invention intercepted；
Fig. 3 A and 3B are respectively the back side and the front perspective view of the cathode of the electron gun of the embodiment of the present invention；
Fig. 4 is to be regarded along the section of the cathode of the central axis AA ' of Fig. 1 electron guns according to embodiments of the present invention intercepted
Figure；
Fig. 5 A and 5B are respectively the front and back three-dimensional view of cathode substructure according to embodiments of the present invention；
Fig. 6 A and 6B are respectively the back side and the front perspective view of the anode of electron gun according to embodiments of the present invention；
Fig. 7 is to be regarded along the section of the cathode of the central axis AA ' of Fig. 1 electron guns according to embodiments of the present invention intercepted
Figure；
Fig. 8 A and 8B are respectively the front and back three-dimensional view of hollow disk according to embodiments of the present invention；
Fig. 9 is the section view along the central axis AA ' of Fig. 1 hollow disks according to embodiments of the present invention intercepted.
Specific embodiment
In order to make the purpose of the present invention, technical solution and advantage are more clearly understood, and pass through below in conjunction with attached drawing specific real
Applying example, the present invention is described in more detail, wherein, in various figures, identical reference numeral represents identical component.It should
Work as understanding, the specific embodiments described herein are merely illustrative of the present invention, is not intended to limit the present invention.
Fig. 1 is the exploded perspective view according to the electron gun of the embodiment of the present invention.Fig. 2 is the central axis AA ' along Fig. 1
The section view of the electron gun of the embodiment according to Fig. 1 of interception.Along the direction of propagation of incident laser, electron gun mainly wraps successively
Include incident sapphire window 10, electron gun pedestal 9, ceramics pole 8, cathode substructure 7, cathode 6, eyeglass 5, hollow disk 4,3 and of anode
Magnetic field shielding plate 1, above-mentioned component combination are fixed on electron-gun mount 2 afterwards.
Fig. 3 A and 3B are respectively the back side and the front perspective view of the cathode 6 of the electron gun of the embodiment of Fig. 1, herein
In, " front " refers to the face of face incoming laser beam 36, and " back side " refers to back to the face of incoming laser beam 36.Fig. 4 is along Fig. 1
Central axis AA ' interception the embodiment of the present invention electron gun cathode 6 section view, the view of Fig. 4 is shown in Fig. 2
What the cathode 6 in view was rotated by 90 ° counterclockwise.With reference to Fig. 3 A, 3B and 4 as can be seen that cathode 6 is " small bell " shape, tool
There is axially symmetric structure, including cylindrical sides W6a, rounded bottom surface W6bAnd connecting cylinder shape side W6aWith rounded bottom surface W6bCompany
Junction W6c.Wherein, the rounded bottom surface W6bRadius for 18mm, center has a light hole 21, outside have depth for 1mm,
Radius is the circular groove 20 of 12.7mm, and for accommodating quartz plate 5, the metal film of nanometer scale thickness is coated on quartz plate 5,
In the embodiment, in order to place quartz plate 5, the rounded bottom surface W of cathode 66bRadius at least above the radius of quartz plate 5, and be
It is convenient for taking out quartz plate 5 from groove 20, four apertures is set also around center light hole 21.Quartz plate uses conductive silver
Glue sticks jail with cathode, ensures that the metal film on surface and cathode are conductive.In addition, the cylindrical sides W6aOpenend on the inside of have
Four protruding portions, are formed as small column 22；The joint face W6cFor arc surface, chamfer radius 13mm.Such cathode is set
Meter comes from that computer simulation optimizes as a result, making cathode in the electron gun structure size claimed range, obtains surface field optimization,
W6cLocate surface field maximum and be no more than 12keV/mm, the internal field for preventing cathode surface is excessive, eliminates that may be present
Point discharge.It should be understood readily by those skilled in this art, quartz plate 5 is used for supported metal membrane, it can also select others can
The material for penetrating incident laser, such as sapphire etc..
As shown in Figure 5 A and 5B, Fig. 5 A and 5B are respectively the back side of the cathode substructure of the embodiment of the present invention and front solid
View.Cathode substructure 7 is the hollow cylinder of one end open one end closing, and there are four L-shaped card slot 23, corresponding cathodes 6 for open end
Four small columns 22 of inside are fixed on cathode by the way that small column 22 to be screwed into card slot 23 and engage cathode 6 with card slot 23
On pedestal 7.The blind end center of cathode substructure 7 has circular light hole 25 (referring to Fig. 2, not shown in Fig. 5 A), while has four
A through hole around circular light hole 25, for cathode substructure 7 to be fixed on ceramics pole 8.Ceramics pole 8 is fixed by bolt 30
In on electron gun pedestal 9.
Fig. 6 A and 6B are respectively the back side of the anode 3 of the electron gun of the embodiment of the present invention and front perspective view, Fig. 7 are
The section view of the anode 3 of the electron gun of the embodiment of the present invention intercepted along the central axis AA ' of Fig. 1, the view of Fig. 7 is Fig. 2
View in anode 3 be rotated by 90 ° counterclockwise.With reference to Fig. 6 A, 6B and 7 as can be seen that anode 3 is " straw hat " shape,
Also there is axially symmetric structure, including circular top surface W3a, cylindrical sides W3b, circular ring shape bottom surface W3cAnd the circular top surface W of connection3a
With cylindrical sides W3bJoint face W3d, wherein, the circular ring shape bottom surface W3cFrom the cylindrical sides W3bLower edge radially
Extend outwardly, the circle top surface W3aRadius be 8mm, circular top surface W3aCenter have diameter 2mm through hole 19, it is described
Joint face W3dFor cambered surface, there is oval chamfering, the elliptical long axis is 10mm, short axle 4mm, the circular ring shape bottom surface
W3cIt is upper that there is circular hole, for the anode 3 to be fixed on hollow disk 4.Such anode design is computer simulation optimization
As a result, making anode in the electron gun structure size claimed range, surface field optimization, W are obtained3dLocate surface field maximum not
More than 13.5keV/mm, it is therefore prevented that the internal field of anode surface is excessive, eliminates point discharge that may be present.
In this embodiment, using hollow 4 fixed anode 3 of disk.Fig. 8 A and 8B are respectively front and the back of the body of hollow disk 4
Face three-dimensional view, Fig. 9 are along the section view of the central axis AA ' of Fig. 1 hollow disks 4 intercepted, and the view of Fig. 9 is also Fig. 2
View in hollow disk 4 be rotated by 90 ° counterclockwise.It is illustrated with reference to Fig. 8 A, 8B and 9, the surface of hollow disk 4
For smooth flat, the radius (inside radius) of medium pore (is more than the circular top surface W of anode 3 for 18mm3aRadius), hollow disk
The radius (outer radius) of circle where 4 outermost edges is 75mm, in addition, the face where 4 outermost edge of hollow disk is cambered surface, tool
There is the chamfering of radius 5mm, chamfering surface electric field maximum is 4keV/mm, it is therefore prevented that the internal field of disc surfaces is excessive, eliminates
Possible point discharge.There is threaded hole at the back side of hollow disk 4, referring to Fig. 2, passes through the circular ring shape of anode 3 by means of bolt 17
Anode 3 and hollow disk 4 are fixed together (in Fig. 2 by the threaded hole of the close medium pore of circular hole and hollow disk 4 on bottom surface
In a bolt 17 is only shown, symmetrical the other three is not shown), passed through by means of bolt 16 on electron-gun mount 2
Hole and hollow disk 4 hollow disk 4 is fixed on electron-gun mount 2 close to outer peripheral threaded hole (only show in fig. 2
One bolt 16, symmetrical the other three are not shown).
Inventor carries out simulative optimization for the design of above-mentioned cathode, anode and hollow disk using computer, makes in the electricity
In sub- rifle structure size claimed range, each parts surface electric field is optimized, and less than the breakdown threshold of vacuum electric field, effect is better than
Conditional electronic rifle.Meanwhile in order to which further optimizing surface electric field is distributed, ensure surface smoothness, to cathode, anode and open circles
Panel surface carries out mechanical rough polishing, manually electrobrightening, essence throwing, high vacuum cleaning, and the smoothness on surface is made to reach micron dimension.
In the assembling process of the electron gun of the embodiment, cathode 6 is screwed into card slot 23 simultaneously using by its inside small column 22
It engages and is fixed on cathode substructure 7 with card slot 23.Without using in cathode W6aInside and cathode substructure top outer processing screw thread,
And then cathode substructure is screwed into the fixed form in cathode.The circular top surface W of anode 33aWith cylindrical sides W3bThrough open circles
The center of disk 4, the circular ring shape bottom surface W of anode 33cOn circular hole blending bolt 17 of aliging with the threaded hole at hollow 4 back side of disk it is solid
Determine (referring to Fig. 2).Without using the W on the outside of anode respectively3bScrew thread is processed in open circles center hole, anode is twisted by screw thread
Enter the fixed form of hollow disk.Both the above is without using screw fixation method, the reason is that screw fixation method can reduce sun
Pole-face W3aWith cathode surface W6bThe depth of parallelism, while the distance between two surfaces can not accurately maintain.In this embodiment,
Electron-gun mount 2 is hollowed out to obtain by block of metal, without using welding, is ensured verticality, is further ensured that anode surface W3aWith cathode
Surface W6bThe depth of parallelism.Anode surface W3aWith cathode surface W6bThe depth of parallelism guarantee, be in order to prevent due to cathode and anode table
Non-uniform electric of the face due to not parallel and between being allowed to, causes internal field excessive, and symmetry reduces, and influences electric field to right
The acceleration effect of electronics, electron beam inside distributed mass reduce, and influence experimental precision.Electron-gun mount 2 is fixed by bolt 32
On electron gun pedestal 9.Entire fixed form ensure that the depth of parallelism of cathode and anode surface, anode and cathode surface distance it is accurate
Degree, the concentricity of electron gun all parts.Entire design is analyzed by mechanics optimization, it is ensured that component uniform force.
In addition, referring to Fig. 2, in this embodiment, cathode 6 is connected with high voltage power supply 29.In order to avoid high voltage power supply 29 connects
Fashionable that excessive stresses are generated to each component of cathode, high pressure access connecting component uses special designing.Connecting component is generally spherical,
So as to eliminate point discharge, reduce local electric field strength.Referring to attached Fig. 1 and 2,12,13 two hemisphere to be mutually matched
Shape coupling part, episphere coupling part 13 are connected to high voltage power supply by conducting wire 14, and lower semisphere coupling part 12 passes through conducting wire
11 are connected to cathode substructure 7.Conducting wire 11 and 14 is screwed into lower semisphere coupling part 12 by fastening screw 27 respectively and connects with episphere
The threaded hole of 13 sides of socket part point.Before conducting wire 11 and 14 is fastened, lower semisphere coupling part 12 and episphere coupling part 13
Assembly can move freely, stress is not generated to cathode.
In the electron gun of the present invention, all fixed components (such as bolt or screw rod etc.) are all built-in or the back of the body is hidden, so as to
Prevent local gap electric field electric discharge phenomena.
As shown in the figures 1 and 2, in this embodiment, the distance between cathode 6 and anode 3 are 8mm, this is corresponding 100kV electricity
The preferred design of sub- rifle.It will be appreciated by those skilled in the art that required electron gun carrying voltage is different, cathode 6 and anode 3
The distance between can be adjusted correspondingly.The present inventor is found through experiments that, in the design of the present invention, cathode 6 and sun
The chamfer radius of the joint face of pole 3 are not limited to above-mentioned occurrence, as long as the radius of the rounded corners of cathode 6 is more than 6 He of cathode
The distance between anode 3, the long axis of the oval chamfering of anode 3 are more than the distance between cathode 6 and anode 3, just can be well
Point discharge is eliminated, so as to prevent that internal field is excessive.In addition, as the joint face W of anode 33dDuring with rounded corners, point is eliminated
The effect of end electric discharge can be more preferable.
Referring to attached drawing 2, in an embodiment of the present invention, electron gun tool is there are two types of operating mode, so as to ensure that electronics produces
Volume.
Transmission mode：The laser 36 that first laser source is sent is by sapphire window 10, the through hole into inside ceramics pole 8
31, then by cathode substructure light hole 25 and cathode center light hole 21 (being not shown referring to Fig. 4, Fig. 2), inject cathode slots
Quartz plate 5 at 20 simultaneously excites the metallic film on 5 surface of quartz plate to generate electronics, and generated electronics is applied in cathode and sun
Electric field acceleration between pole is simultaneously projected from electron gun.
Reflective-mode：The electron gun further includes speculum 38, and speculum 38 is away from 6 outer surface center vertical range of cathode
The lateral separation of 6 outer surface center of cathode (speculum 38 shown in Fig. 2 with) be 250mm, and horizontal distance (hang down by lateral separation
The upward distance of Nogata) it is adjustable, the direction of the light of the central through hole 19 of anode 3 is reflected into for changing speculum 38, is protected simultaneously
Card does not stop the electron beam from the outgoing of central through hole 19 of anode 3.In a reflective mode enabling, 37 quilt of laser that second laser source is sent
Speculum 38 reflects, and by magnetic screen light hole 35, anodes centre's through hole 19, is finally incident to the metal foil on 5 surface of quartz plate
Film excites electronics.In this embodiment, in order to ensure that reflective-mode works normally, the diameter of magnetic screen light hole 35 is at least
8mm, in addition, in order to which laser is made to be smoothly through the central through hole 19 of anode 3, in the circular top surface W of anode 33aInside set
The groove 18 of central through hole 19 is surrounded, as shown in Fig. 6 A and 7,18 long 14mm of groove, width 2mm, depth 2mm, those skilled in the art
It is appreciated that the size and shape of groove 18 are not limited to this.The electron gun of reflective-mode overcomes current transmitted electron rifle list
The problem of quantum count that generates electricity is small improves the stability of electron gun.For the electron gun of reflective-mode, the thickness of metal film can be with
Reach micron to millimeter magnitude, therefore, the quartz plate 5 of supported metal membrane can be not required in this case.
Referring to attached Fig. 1 and 2, in an embodiment of the present invention, all components use weak magnetic stainless steel inside electron gun, from
And improve diamagnetic performance.Due to the special designing of electron-gun mount of the present invention and the presence of anode fixed disc, electron gun
Present semi-closed state, while support back side magnetic field shielding plate 1 presence, electron gun is made effectively can to prevent external magnetic field from doing
It disturbs, is further ensured that the steady-working state of electron gun.The present inventor is had found by optimizing to calculate, to ensure that outgoing electron beam is steady
Qualitative, 29 output pulsation of voltage source voltage is no more than 0.1%.Series limiting resistor 28 between electron gun and voltage source, resistance
It is worth for 1/10th to 1 percent of system resistance value before series connection.By this current-limiting resistance, prevent unexpectedly electric discharge to periphery electricity
The destruction of sub- equipment.Due to the presence of protection mechanism, in electron gun warm, using controllable weak discharge process to negative and positive
Pole surface is polished and clears up, and a kind of anode and cathode surface polishing and method for cleaning are added for the type electron gun.
Although the present invention has been described by means of preferred embodiments, the present invention is not limited to described here
Embodiment, further include made various changes and variation without departing from the present invention.
Claims (11)
1. a kind of photocathode ultra-fast electron gun, including cathode, anode and the high voltage power supply for being connected to the cathode, wherein,
The cathode is axially symmetric structure, including the first cylindrical sides, rounded bottom surface and connection first cylindrical side
Face and the first joint face of the rounded bottom surface, the center of the rounded bottom surface have light hole and the rounded bottom surface
Outside has the circular groove for accommodating metal film,
The anode is axially symmetric structure, including described in circular top surface, the second cylindrical sides, circular ring shape bottom surface and connection
Second joint face of circular top surface and second cylindrical sides, the circular ring shape bottom surface is from second cylindrical sides
Lower edge extends radially outwardly, and the circle end face center has through hole,
Wherein, first joint face has rounded corners, and the radius of the rounded corners is greater than or equal to the circle of the cathode
The distance between circular top surface of shape bottom surface and the anode, second joint face have oval chamfering, the ellipse
The long axis of chamfering is greater than or equal to the distance between the rounded bottom surface of the cathode and the circular top surface of the anode.
2. photocathode ultra-fast electron gun according to claim 1 further includes the cathode substructure of the fixed cathode.
3. photocathode ultra-fast electron gun according to claim 2, wherein, on the inside of the openend of first cylindrical sides
With protruding portion, the cathode substructure is the hollow cylinder of one end open one end closing, and the open end of the hollow cylinder has
The card slot that can be engaged with the protruding portion, the center of the blind end of the hollow cylinder have light hole.
4. photocathode ultra-fast electron gun according to claim 1 further includes the hollow disk of the fixed anode.
5. photocathode ultra-fast electron gun according to claim 4, wherein, the face where the outermost edge of the hollow disk
For cambered surface.
6. photocathode ultra-fast electron gun according to claim 1, wherein, the rounded bottom surface of the cathode and the anode
The distance between circular top surface is 8mm.
7. the photocathode ultra-fast electron gun according to any one of claim 1-6, further includes lasing light emitter, described for exciting
Metal film generates electronics.
8. photocathode ultra-fast electron gun according to claim 7, wherein, the laser of the lasing light emitter transmitting passes through cathode
The center light hole of rounded bottom surface reaches the metal film.
9. photocathode ultra-fast electron gun according to claim 7, speculum is further included, the speculum is by the lasing light emitter
The laser reflection of transmitting is by the through hole of the anode and reaches the metal film.
10. photocathode ultra-fast electron gun according to claim 9, wherein, the inside of the circular top surface of the anode has
Groove, the through hole of the anode are arranged in the groove.
11. photocathode ultra-fast electron gun according to claim 1, current limliting is connected between the high voltage power supply and the cathode
Resistance, 1/10th to 1 percent of the resistance value of the resistance value of the current-limiting resistance between the cathode and the anode.
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| CN107359098B (en) * | 2017-08-22 | 2023-06-16 | 中国科学技术大学 | Photocathode microwave electron gun |
| CN111490437A (en) * | 2019-04-15 | 2020-08-04 | 中国科学院物理研究所 | Device and method for inducing frequency-controllable microwave radiation by utilizing action of laser and antenna target |
| CN110890256B (en) * | 2019-11-26 | 2021-07-27 | 华中科技大学 | Non-magnetic femtosecond electron source device with adjustable convergence angle |
| CN111540662B (en) * | 2020-05-08 | 2023-04-11 | 中国工程物理研究院流体物理研究所 | Ultrahigh voltage direct current electron gun suitable for ultrafast electron diffraction technology |
| CN112563098B (en) * | 2021-01-10 | 2023-06-09 | 赣南师范大学 | Direct current photocathode ultrafast electron gun with immersed electrostatic lens |
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| US6476340B1 (en) * | 1999-04-14 | 2002-11-05 | The Boc Group, Inc. | Electron beam gun with grounded shield to prevent arc-down and gas bleed to protect the filament |
| CN102592929B (en) * | 2011-01-18 | 2015-01-14 | 华东师范大学 | Electron gun device for generating high-brightness femtosecond electronic pulse |
| CN103852479A (en) * | 2014-02-12 | 2014-06-11 | 中国科学院物理研究所 | Light emitting cathode testing system for exploring efficient light cathode material |
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