CN215183844U - Terahertz electron gun - Google Patents
Terahertz electron gun Download PDFInfo
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- CN215183844U CN215183844U CN202121102036.2U CN202121102036U CN215183844U CN 215183844 U CN215183844 U CN 215183844U CN 202121102036 U CN202121102036 U CN 202121102036U CN 215183844 U CN215183844 U CN 215183844U
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Abstract
The utility model discloses a terahertz electron gun, which comprises a tip cathode (1), a cavity cathode end plate (2), a cavity (3), a cavity outlet end plate (4) and a beam hole (5); the tip cathode (1) and the cavity cathode end plate (2) are of an integral structure, in the inner area of the cavity (3), the field intensity of the position is the highest field intensity position in the cavity (3), and the surface of the tip cathode (1) emits electrons under the action of a strong electric field; the cavity cathode end plate (2), the cavity (3) and the cavity outlet end plate (4) are independent elements respectively and are connected to form a whole; the beam current hole (5) is arranged at the center of the cavity outlet end plate (4) and used for leading out beam current. The utility model discloses a simple structure is compact, easily processing, and is easily practical. The electron gun is simple and compact in structure, the terahertz field is established in the cavity, when the amplitude of the electric field exceeds the field emission condition, electrons are emitted from the surface of the cathode, ultrashort femtosecond pulse beams are generated, and the problem of pulse jitter is solved.
Description
Technical Field
The utility model relates to an accelerator field especially relates to a terahertz electron gun now.
Background
The cathode used for electron gun to generate electron source mainly includes hot cathode, photocathode and field emission cathode, among them the traditional field emission cathode emits electrons under the action of strong electrostatic field (GV/m), the pulse beam width depends on the pulse width of electrostatic high voltage. For a terahertz waveband accelerator, the requirement of the pulse width of a beam group is less than one hundred femtoseconds, the jitter is less than 10 femtoseconds, and the traditional voltage pulse width and photocathode driving laser cannot meet the requirement.
SUMMERY OF THE UTILITY MODEL
The utility model provides a terahertz electron gun has solved the problem of terahertz wave band accelerator electron source to prior art's not enough.
In order to achieve the above object, the present invention provides a technical solution for solving the technical problem:
a terahertz electron gun comprises a tip cathode 1, a cavity cathode end plate 2, a cavity 3, a cavity outlet end plate 4 and beam holes 5. The tip cathode 1 is of unitary construction with the chamber cathode end plate 2, in the region inside the chamber 3. The field intensity is the highest field intensity inside the cavity 3, and the surface of the tip cathode 1 emits electrons under the action of a strong electric field; the cavity cathode end plate 2, the cavity 3 and the cavity outlet end plate 4 are independent elements respectively and are connected to form a whole. And the beam current hole 5 is arranged in the center of the cavity outlet end plate and used for leading out beam current.
Further, a terahertz field is established in the cavity, when the amplitude of the electric field exceeds a field emission condition, electrons are emitted from the surface of the cathode, and when the amplitude of the electric field does not meet the field emission condition, no electrons are emitted, so that a pulse beam is formed.
Further, the top of the tip cathode 1 is a circular arc, and the joint of the tip cathode 1 and the cavity cathode end plate 2 is a chamfer.
Furthermore, the top of the tip cathode 1 is a circular arc, and the joint of the tip cathode 1 and the cavity cathode end plate 2 is an included angle.
Further, the terahertz electron gun is used for generating femtosecond pulse electron beams.
The advantages and positive effects are as follows:
the utility model has the advantages that: the utility model discloses a simple structure is compact, easily processing, and is easily practical. The electron gun is simple and compact in structure, the terahertz field is established in the cavity, when the amplitude of the electric field exceeds the field emission condition, electrons are emitted from the surface of the cathode, ultrashort femtosecond pulse beams are generated, and the problem of pulse jitter is solved.
Drawings
Fig. 1 is a schematic structural diagram of a terahertz electron gun according to embodiment 1 of the present invention;
fig. 2 is the utility model discloses embodiment 2 terahertz electron gun's schematic structure.
In the figure: 1 is a tip cathode, 2 is a cavity cathode end plate, 3 is a cavity, 4 is a cavity outlet end plate, and 5 is a beam-flow hole.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The following examples are only for explaining the present invention, and the scope of the present invention should include all the contents of the claims, and all the contents of the claims of the present invention can be fully realized by those skilled in the art through the description of the following examples.
Example 1
As shown in fig. 1: a terahertz electron gun comprises a tip cathode 1, a cavity cathode end plate 2, a cavity 3, a cavity outlet end plate 4 and beam holes 5. The top of the tip cathode 1 is a circular arc, and the joint of the tip cathode 1 and the cavity cathode end plate 2 is a chamfer.
The tip cathode 1 and the cavity cathode end plate 2 are of an integral structure, do not need to be welded, and are arranged in the inner area of the cavity 3. The field intensity is the highest field intensity inside the cavity 3, and the surface of the tip cathode 1 emits electrons under the action of a strong electric field.
The cavity cathode end plate 2, the cavity 3 and the cavity outlet end plate 4 are independent elements respectively and are connected to form a whole. A terahertz field is established in the cavity 3, when the amplitude of the electric field exceeds the field emission condition, electrons are emitted from the surface of the cathode, and when the amplitude of the electric field does not meet the field emission condition, no electrons are emitted to form a pulse beam.
And the beam current hole 5 is arranged in the center of the outlet end plate of the cavity 3 and used for leading out beam current.
Example 2
As shown in fig. 2, in the terahertz electron gun, the top of a tip cathode 1 is a circular arc, an included angle is formed at the joint of the tip cathode 1 and a cavity cathode end plate 2, and the structure of the rest part is the same as that of embodiment 1.
To sum up, the utility model provides a terahertz electron gun for produce femto second level pulse electron beam.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A terahertz electron gun is characterized by comprising a tip cathode (1), a cavity cathode end plate (2), a cavity (3), a cavity outlet end plate (4) and beam holes (5);
the tip cathode (1) and the cavity cathode end plate (2) are of an integral structure, in the inner area of the cavity (3), the field intensity of the position is the highest field intensity position in the cavity (3), and the surface of the tip cathode (1) emits electrons under the action of a strong electric field;
the cavity cathode end plate (2), the cavity (3) and the cavity outlet end plate (4) are independent elements respectively and are connected to form a whole; the beam current hole (5) is arranged at the center of the cavity outlet end plate (4) and used for leading out beam current.
2. The electron gun according to claim 1, characterized in that the top of the tip cathode (1) is a circular arc and the junction with the cavity cathode end plate (2) is a chamfer.
3. The electron gun according to claim 1, characterized in that the top of the tip cathode (1) is a circular arc and the junction with the cavity cathode end plate (2) is an angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121102036.2U CN215183844U (en) | 2021-05-21 | 2021-05-21 | Terahertz electron gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121102036.2U CN215183844U (en) | 2021-05-21 | 2021-05-21 | Terahertz electron gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215183844U true CN215183844U (en) | 2021-12-14 |
Family
ID=79374530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121102036.2U Active CN215183844U (en) | 2021-05-21 | 2021-05-21 | Terahertz electron gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215183844U (en) |
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2021
- 2021-05-21 CN CN202121102036.2U patent/CN215183844U/en active Active
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