阅读说明：本技术 一种一体化带状注聚焦系统 (Focusing system is annotated to integration banding ) 是由 尹鹏程 魏彦玉 徐进 岳玲娜 殷海荣 赵国庆 王文祥 方栓柱 杨瑞超 罗瑾璟 张 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种一体化带状注聚焦系统,包括两个形状相同且镜像配置的一体化极靴和多个磁块；所述一体化极靴上设置有多个均匀分布的栅,成梳状结构；相邻两个栅之间放置磁块,从而使得栅和磁块交错放置；所述磁块充磁方向为沿带状电子注传输方向,在单个一体化极靴中,任意相邻的两个磁块充磁方向都是两两相反。本发明提出的一种一体化带状注聚焦系统,具有易于加工,加工精度高,安装方便。该结构生成的磁场精度比传统聚焦系统更高。并且经过试验对比,该结构实现的电子流通率比传统的带状注聚焦系统高出30％,从而有效提高电子效率、输出功率和降低能量损耗。面对越来越多的带状电子注器件,本发明有较为广泛的应用空间。(The invention discloses an integrated zonal focusing system, which comprises two integrated pole shoes and a plurality of magnetic blocks, wherein the integrated pole shoes are identical in shape and are configured in a mirror image mode; a plurality of grids which are uniformly distributed are arranged on the integrated pole shoe and form a comb-shaped structure; a magnetic block is arranged between two adjacent grids, so that the grids and the magnetic blocks are arranged in a staggered manner; the magnetizing directions of the magnetic blocks are along the transmission direction of the strip-shaped electron beam, and in a single integrated pole shoe, the magnetizing directions of any two adjacent magnetic blocks are opposite to each other. The integrated belt-shaped coke injection and accumulation system provided by the invention is easy to process, high in processing precision and convenient to install. The structure generates a magnetic field with higher accuracy than conventional focusing systems. And through experimental comparison, the electron current-through rate realized by the structure is 30% higher than that of the traditional strip-shaped beam focusing system, so that the electron efficiency and the output power are effectively improved, and the energy loss is reduced. The invention has wider application space in the face of more and more ribbon electron beam devices.)

1. An integrated strip-shaped focusing system is characterized by comprising two integrated pole shoes (1) which have the same shape and are arranged in a mirror image mode and a plurality of magnetic blocks (2);

a plurality of grids (3) which are uniformly distributed are arranged on the integrated pole shoe (1) and form a comb-shaped structure; a magnetic block is arranged between two adjacent grids (3), so that the grids (3) and the magnetic blocks (2) are arranged in a staggered mode;

the magnetizing directions of the magnetic blocks (2) are along the transmission direction of the strip-shaped electron beam, and in the single integrated pole shoe (1), the magnetizing directions of any two adjacent magnetic blocks (2) are opposite to each other.

2. The integrated belt-type focus injection system according to claim 1, wherein the integrated pole shoe (1) has a top thickness t; the integral width of the integrated pole shoe (1) is ix; the gates (3) are periodically distributed gates (3), and the period length of the gates (3) is p; the thickness of the grid (3) is iz; the staggered distance of the grids (3) in the horizontal direction is dx.

3. An integrated belt-type focusing system according to claim 2, characterized in that the bottom and middle of the grid (3) are respectively provided with a pair of protrusions (4), so that the integrated pole shoe (1) is provided with an upper slot and a lower slot which are identical in size; the width of the slot between the grids (3) is mz, and the height is my.

4. An integrated band-type focus injection system according to claim 3, wherein the integrated pole shoes (1) are made of soft magnetic material for guiding the transmission of magnetic field to a specific direction.

5. The integrated belt-shaped focusing system according to claim 4, wherein the magnetic blocks (2) are made of magnetic materials and provide magnetic energy for the integrated pole shoe (1).

6. An integrated zonal focusing system according to claim 5, characterized in that the magnetic blocks (2) are shaped to fit the slots and are rectangular blocks with dimensions mz my ix.

7. The integrated belt-shaped focusing system according to claim 5, wherein the magnetic blocks (2) are permanent magnets.

Technical Field

The invention relates to the technical field of vacuum electronic devices, in particular to an integrated belt-shaped focusing system.

Background

The ribbon-shaped vacuum electronic device is widely applied to the fields of high-resolution radar, high-speed data communication, electronic attack, radio astronomy and the like. Compared with the traditional circular column device, the ribbon beam traveling wave tube, the ribbon beam klystron, the ribbon beam free electron laser and other ribbon beam devices have obvious advantages. In addition, the ribbon beam is thin enough and closer to the surface of the high frequency circuit, thus enabling good coupling with the slow wave structure and having higher energy conversion efficiency. These advantages have stimulated the development of SEB devices. In which, by using SEB, CPI developed an X-band klystron with 5MW output in 2009.

However, the greatest difficulty in the development of tape-shaped devices is the focusing of the electron beam. Since the ribbon electron beam itself is not axisymmetric, the space charge field generated by the ribbon electron beam is also non-axisymmetric. The ribbon beam is very difficult to focus by conventional means. For example, it has been found experimentally that a ribbon electron beam breaks and forms multiple filaments after being transported over a distance under the action of a magnetic field in the electron beam transport direction (z direction), which is called a Diocotron instability, or Diocotron instability. In addition, since the channel of most ribbon beam devices is very narrow, the range over which the ribbon electron beam can fluctuate is not large. This further exacerbates the difficulty of focusing. With the increasing demand for high power devices, the need for ribbon focusing is also increasing.

Disclosure of Invention

The technical problems to be solved by the invention are that the existing strip-shaped beam focusing system is complex in structure, inconvenient to install, low in generated magnetic field precision and low in electron circulation rate realized by the existing strip-shaped beam focusing system, and the invention aims to provide an integrated strip-shaped beam focusing system to solve the problems.

The invention is realized by the following technical scheme:

an integrated belt-shaped injection focusing system comprises two integrated pole shoes and a plurality of magnetic blocks, wherein the integrated pole shoes are identical in shape and are configured in a mirror image mode;

a plurality of grids which are uniformly distributed are arranged on the integrated pole shoe and form a comb-shaped structure; a magnetic block is arranged between two adjacent grids, so that the grids and the magnetic blocks are arranged in a staggered manner;

the magnetizing directions of the magnetic blocks are along the transmission direction of the strip-shaped electron beam, and in a single integrated pole shoe, the magnetizing directions of any two adjacent magnetic blocks are opposite to each other.

The magnetic pole shoe mainly comprises an integrated pole shoe and a magnetic block, wherein the integrated pole shoe is made of soft magnetic materials, and the magnetic block is made of magnetic materials. The integrated pole shoe is formed by connecting a plurality of grids (pole shoes), wherein each metal grid is provided with a pair of protrusions (pole shoe feet) at the bottom and in the middle.

Further, the top of the integrated pole shoe has a thickness t; the integral width of the integrated pole shoe is ix; the gates are periodically distributed, and the period length of each gate is p; the thickness of the gate is iz; the grid is staggered by a distance dx in the horizontal direction.

Furthermore, the bottom and the middle of the grid are respectively provided with a pair of protrusions, so that an upper slot and a lower slot which are identical in size exist in the integrated pole shoe; the width of the slot between the grids is mz, and the height is my.

Further, the integrated pole shoe is made of soft magnetic material and is used for guiding the transmission of the magnetic field to a specific direction.

Further, the magnetic block is made of a magnetic material and provides magnetic energy for the integrated pole shoe.

Furthermore, the magnetic blocks are shaped to fit the slots and are rectangular blocks with the size of mz my ix.

Further, the magnetic block is a permanent magnet.

The working principle of the invention is as follows: the magnetized magnetic blocks are inserted into the integrated pole shoes, and then the upper integrated pole shoe and the lower integrated pole shoe act together to jointly generate a magnetic field which is periodically distributed along the electron transmission direction. This magnetic field will act on the ribbon electron beam between the two integrated pole pieces. By the periodic magnetic field generated by the system, the strip-shaped electron beam overcomes the self-generated space charge force, so that the strip-shaped electron beam can be stably transmitted.

The integrated belt-shaped coke injection and accumulation system provided by the invention is easy to process, high in processing precision and convenient to install. The structure generates a magnetic field with higher accuracy than conventional focusing systems. And through experimental comparison, the electron current-through rate that this structure realized is higher than traditional banding focusing system 30% to effectively improve electron efficiency, output and reduce energy loss. The invention has wider application space in the face of more and more ribbon electron beam devices.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the integrated belt-shaped coke injection and accumulation system provided by the embodiment of the invention has the advantages of simple processing and high precision, can be integrally processed by using one blank, does not need additional processing steps, and greatly shortens the processing period. In addition, all the grids are processed at one time, so that the relative position precision between the grids is very high, and the final electron circulation efficiency is greatly improved.

2. The integrated strip focusing system provided by the embodiment of the invention is simple to assemble, and omits a plurality of parts for fixing.

3. According to the integrated strip-shaped focusing system provided by the embodiment of the invention, the magnetic blocks can be inserted into the integrated pole shoe from left and right and cannot be ejected, and the magnetic blocks do not need to be fixed by additional parts.

4. According to the integrated strip-shaped focusing system provided by the embodiment of the invention, the magnetic leakage is low, and the upper parts of all the grids are connected together, so that a magnetic induction line loop is formed. The magnetic field that should leak back into the system along the upper part greatly reduces the magnetic field leakage.

5. According to the integrated strip-shaped focusing system provided by the embodiment of the invention, the magnetic blocks can be inserted into the integrated pole shoe from left and right, and cannot be ejected, and the magnetic blocks do not need to be fixed by extra parts.

6. The integrated strip-shaped focusing system provided by the embodiment of the invention is easy to debug, firstly, because each integrated pole shoe is provided with two magnetic block slots, different magnetized pole shoes can be inserted for debugging in the debugging process, and the debugging effect is greatly improved.

7. The integrated strip beam focusing system provided by the embodiment of the invention is suitable for millimeter wave terahertz strip beam devices, and can provide high-quality electron beam circulation for the devices, so that the electron efficiency and the output power are improved, and the problems of current interception, tube wall heating and the like are reduced.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural diagram of an integrated ribbon beam focusing system provided by the present invention;

FIG. 2 is a schematic view of an integrated pole piece grid structure of the present invention;

FIG. 3 is a schematic view of the parameters of the integrated pole piece grid side structure of the present invention;

FIG. 4 is a schematic view of structural parameters of the bottom surface of the integrated pole piece grid of the present invention;

FIG. 5 is a schematic diagram of the structural parameters of the magnetic block of the present invention;

FIG. 6 is a graph of the axial magnetic field generated by the integrated zonal focusing system provided by the present invention;

fig. 7 is a diagram illustrating the focusing effect of the magnetic field generated by the integrated band-shaped focusing system on the electron beam.

Reference numbers and corresponding part names in the drawings:

1-integrated pole shoe, 2-magnetic block, 3-grid and 4-protrusion.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.

Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.

Examples

As shown in fig. 1, an integrated belt-shaped focusing system provided by an embodiment of the present invention includes an integrated pole shoe 1 and a magnetic block 2. In a complete integrated PCM system, comprises an upper integrated pole shoe, a lower integrated pole shoe and a magnetic block 2. The upper integrated pole shoe and the lower integrated pole shoe are completely the same and are of a comb-shaped structure. The integrated pole shoe is made of soft magnetic materials, and the integrated pole shoe can be made of iron, permalloy or silicon steel and the like. In a single integrated pole shoe, the magnetizing directions of all two adjacent magnetic blocks are opposite to each other. The size of the magnetic block is completely the same as that of the slot in the pole shoe.

As shown in fig. 2, the bottom and the middle of the grid 3 are respectively provided with a pair of protrusions 4, so that an upper slot and a lower slot are formed in the integrated pole shoe 1; the two slots are of identical dimensions.

As shown in fig. 3 and 4, the integrated pole piece top has a thickness t. The integral width of the integrated pole shoe is ix. The width and height of the slots between the grids are mz and my, respectively. The period length of the gate is p. The thickness of the gate is iz. The grid is staggered by a distance dx in the horizontal direction.

As shown in fig. 5, the magnetic block is a rectangular block and made of magnetic material, and the magnetic block may be samarium-cobalt magnet, ru-fe-b magnet, or the like. The magnetic blocks are directly inserted into the integrated pole shoe, the size of the magnetic blocks is completely the same as that of the slots, and the size of the magnetic blocks is mz my ix.

The working principle of the invention is as follows: the magnetized magnetic blocks are inserted into the integrated pole shoes, and then the upper integrated pole shoe and the lower integrated pole shoe act together to jointly generate a magnetic field which is periodically distributed along the electron transmission direction. This magnetic field will act on the ribbon electron beam between the two integrated pole pieces. By the periodic magnetic field generated by the system, the strip-shaped electron beam overcomes the self-generated space charge force, so that the strip-shaped electron beam can be stably transmitted.

As shown in fig. 6, fig. 6 is a graph of an axial magnetic field generated by the integrated zonal focusing system provided by the present invention;

as shown in fig. 7, fig. 7 is a diagram illustrating the focusing effect of the magnetic field generated by the integrated strip focusing system on the electron beam according to the present invention.

And performing magnetic field simulation and particle tracking simulation on the magnetic field by using CST. The final IPCM system produced a periodic magnetic field with a peak value of 0.21 Tesla. And the focusing of a ribbon electron beam of 17kV voltage and 0.2A current is achieved.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.