CN207217459U - A kind of photocathode protection - Google Patents
A kind of photocathode protection Download PDFInfo
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- CN207217459U CN207217459U CN201721052488.8U CN201721052488U CN207217459U CN 207217459 U CN207217459 U CN 207217459U CN 201721052488 U CN201721052488 U CN 201721052488U CN 207217459 U CN207217459 U CN 207217459U
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- cavity
- cylindrical cavity
- coaxial
- coupling aperture
- coaxial cavity
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Abstract
The utility model discloses a kind of photocathode protection, including the first cylindrical cavity, the second cylindrical cavity, coaxial cavity, annulus hole, rectangular waveguide, coupling aperture, hollow disc and cut-off waveguide, wherein the second cylindrical cavity is connected with the first cylindrical cavity and coaxial cavity respectively, second cylindrical cavity end carries cut-off waveguide, and coaxial cavity is connected realization coupling by coupling aperture with rectangular waveguide.The utility model is compact-sized, microwave power coupling aperture is moved into coaxial cavity one end by cylindrical cavity side, keeps the rotational symmetry of cylindrical cavity, is avoided because asymmetry coupling aperture produces multipole fields, so that with beam emittance is reduced, the good result of quality of beam is improved.
Description
Technical field
It the utility model is related to accelerator field, more particularly to a kind of photocathode protection.
Background technology
Photocathode protection is mainly the electron source for producing high-quality, is internationally recognized following high-quality electron source
Generation device, be advanced light source, free-electron laser, THz source and based on high-quality electronic beam current system candidate electricity
Component.It is to produce electronics by laser bombardment photocathode, in the presence of microwave field, accelerates to draw electronic beam current.Conventional light
Negative electrode microwave electron gun, microwave power open coupling aperture by cylindrical cavity side, in cylindrical cavity internal motivation microwave field.Due to perforate
The asymmetry of position, multipole fields are easily encouraged inside cylindrical cavity.In the presence of multipole fields, beam emittance increases, beam
Family status matter reduces.
The utility model provides a kind of photocathode protection, solves coupling aperture position of opening and destroys cylindrical cavity rotation
The problem of symmetry.
Utility model content
In view of the shortcomings of the prior art, the utility model provides a kind of photocathode protection, solves coupling aperture and opens
The problem of cylindrical cavity rotational symmetry, is destroyed in hole site.
To achieve these goals, the technical scheme in the invention for solving the technical problem is：
A kind of photocathode protection, including the first cylindrical cavity, the second cylindrical cavity, coaxial cavity, annulus hole, square wave
Lead, coupling aperture, hollow disc and cut-off waveguide, wherein the first cylindrical cavity and the second cylindrical cavity are connected by hollow disc,
Two cylindrical cavity ends carry cut-off waveguide, and the second cylindrical cavity is connected with coaxial cavity, and coaxial cavity passes through coupling aperture and rectangular waveguide phase
Even, coaxial cavity be connected by annulus hole with the second cylindrical cavity forms resonator, and one end is connected with coupling aperture, realize rectangular waveguide and
Coaxial cavity couples.
Wherein, the coaxial cavity and the second cylindrical cavity composition resonator, are connected by annulus hole, wherein outside annulus hole inwall
Footpath is connected with coaxial cavity wall internal diameter, and annulus hole inwall internal diameter and the second cylinder cavity wall external diameter are connected.
Wherein, the annulus hole is located at the center of coaxial cavity length, and annulus hole is located in the second cylinder cavity length
Heart position.
Wherein, the coaxial cavity is connected by coupling aperture with rectangular waveguide, the side end face inwall of coupling aperture one and coaxial cavity one
Hold inwall coplanar.
The beneficial effects of the utility model：The utility model is compact-sized, by microwave power coupling aperture by cylindrical cavity side
Coaxial cavity one end is moved to, keeps the rotational symmetry of cylindrical cavity, avoids because asymmetry coupling aperture produces multipole fields, makes
Must have reduces beam emittance, improves the good result of quality of beam.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is diagrammatic cross-section of the present utility model.
Mark meaning is in Fig. 2：101 be rectangular waveguide, and 102 be coupling aperture, and 103 be coaxial cavity, and 104 be annulus hole, 105
It is cut-off waveguide for the first cylindrical cavity, 106,107 be the second cylindrical cavity, and 108 be hollow disc.
Embodiment
Illustrate the utility model is further described below in conjunction with the accompanying drawings：
As shown in Figure 2：A kind of photocathode protection, including coaxial cavity 103, annulus hole 104, the first cylindrical cavity 105,
Hollow disc 108, the second cylindrical cavity 107, cut-off waveguide 106, rectangular waveguide 101 and coupling aperture 102.
First cylindrical cavity 105 and the second cylindrical cavity 107 are connected by hollow disc 108, wherein the end of the second cylindrical cavity 107
With cut-off waveguide 106, the second cylindrical cavity 107 is connected with coaxial cavity 103, and coaxial cavity 103 passes through coupling aperture 102 and rectangular waveguide
101 are connected, and coaxial cavity 103 is connected composition resonator, one end and the phase of coupling aperture 102 by annulus hole 104 with the second cylindrical cavity 107
Even, realize that rectangular waveguide 101 couples with coaxial cavity 103.
The cylindrical cavity 107 of coaxial cavity 103 and second forms resonator, is connected by annulus hole 104, in annulus hole 104
Wall external diameter is connected with the inwall internal diameter of coaxial cavity 103, and the inwall internal diameter of annulus hole 104 and the inwall external diameter of the second cylindrical cavity 107 are connected, circle
Annular distance 104 is located at the center of the length of coaxial cavity 103, and annulus hole 104 is located at the center of the length of the second cylindrical cavity 107.
The coaxial cavity 103 is connected by coupling aperture 102 with rectangular waveguide 101, the side end face inwall of coupling aperture 102 1 with it is same
One end inwall of axocoel 103 is coplanar.
In summary, the utility model provides a kind of photocathode protection, maintains the rotational symmetry of cylindrical cavity
Property, asymmetric coupling aperture excitation multipole fields are avoided, reduce the emittance of electron beam source, improve quality of beam, electronic beam current is stable
Property is good.
General principle, principal character and advantage of the present utility model has been shown and described above.The technology people of the industry
For member it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification is explanation
Principle of the present utility model, on the premise of the spirit and scope of the utility model is not departed from, the utility model also has various changes
Change and improve, these changes and improvements will be fallen into claimed the scope of the utility model.The requires of the utility model is protected
Scope is by appended claims and its equivalent circle.
Claims (4)
1. a kind of photocathode protection, including the first cylindrical cavity, the second cylindrical cavity, coaxial cavity, annulus hole, rectangular waveguide,
Coupling aperture, hollow disc and cut-off waveguide, wherein the first cylindrical cavity and the second cylindrical cavity are connected by hollow disc, the second circle
Post chamber end carries cut-off waveguide, and the second cylindrical cavity is connected with coaxial cavity, and coaxial cavity is connected by coupling aperture with rectangular waveguide, its
It is characterised by：Coaxial cavity is connected composition resonator by annulus hole with the second cylindrical cavity, and one end is connected with coupling aperture, realizes rectangle
Waveguide couples with coaxial cavity.
A kind of 2. photocathode protection according to claim 1, it is characterised in that：The coaxial cavity and the second cylinder
Chamber forms resonator, is connected by annulus hole, wherein annulus hole inwall external diameter is connected with coaxial cavity wall internal diameter, annulus hole inwall
Internal diameter and the second cylinder cavity wall external diameter are connected.
A kind of 3. photocathode protection according to claim 2, it is characterised in that：The annulus hole is located at coaxial cavity
The center of length, annulus hole are located at the center of the second cylinder cavity length.
A kind of 4. photocathode protection according to claim 1, it is characterised in that：The coaxial cavity passes through coupling aperture
It is connected with rectangular waveguide, the side end face inwall of coupling aperture one and coaxial cavity one end inwall are coplanar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721052488.8U CN207217459U (en) | 2017-08-22 | 2017-08-22 | A kind of photocathode protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721052488.8U CN207217459U (en) | 2017-08-22 | 2017-08-22 | A kind of photocathode protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207217459U true CN207217459U (en) | 2018-04-10 |
Family
ID=61816137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721052488.8U Active CN207217459U (en) | 2017-08-22 | 2017-08-22 | A kind of photocathode protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207217459U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769017A (en) * | 2020-07-10 | 2020-10-13 | 清华大学 | Photocathode microwave electron gun |
-
2017
- 2017-08-22 CN CN201721052488.8U patent/CN207217459U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769017A (en) * | 2020-07-10 | 2020-10-13 | 清华大学 | Photocathode microwave electron gun |
| CN111769017B (en) * | 2020-07-10 | 2021-05-14 | 清华大学 | Photocathode microwave electron gun |
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