RADIO FREQUENCY ELECTRON ACCELERATOR FOR LOCAL FREQUENCY MODULATION AND FREQUENCY MODULATION METHOD THEREOF

Abstract

A radio frequency electron accelerator structure for local frequency modulation includes an accelerating cavity, a coupling cavity, and a beam hole. The accelerating cavity and the coupling cavity are alternately assembled together, and the beam hole penetrates the accelerating cavity and the coupling cavity. A local cutting area is arranged inside both the accelerating cavity and the coupling cavity. A local frequency modulation method for a radio frequency electron accelerator is further provided. In the frequency modulation stage of the accelerating cavity, the local cutting area of the accelerating cavity is cut. When the feed amount is large, the change of the volume of the cavity is still small, and the generated frequency variation of the cavity is small, which significantly reduces the difficulty of frequency modulation, lowers the accuracy requirements of machine tools at the same time, and decreases the cost of enterprises accordingly.

Claims

1.-8. (canceled)

9. A local frequency modulation method for a radio frequency electron accelerator, wherein, an accelerating cavity component and a coupling cavity component joint together to form the radio frequency electron accelerator; in a machining process, first separating the accelerating cavity component and the coupling cavity component, then performing a cutting on a wall surface of a cavity body of the radio frequency electron accelerator, and finally assembling the accelerating cavity component and the coupling cavity component into a complete accelerating tube; the cutting is divided into a rough turning stage and a frequency modulation stage, and the cutting is performed as follows: (1) overall cutting: wherein the overall cutting is suitable for the rough turning stage; when each wall surface of the radio frequency electron accelerator is cut into a plurality of components meeting specifications according to drawings, integrally cutting an inner surface of the cavity body of the radio frequency electron accelerator to quickly reduce a difference between a current intrinsic frequency and a target intrinsic frequency of the cavity body of the accelerating cavity and leave a machining allowance for the frequency modulation stage; and (2) local cutting: wherein the local cutting is suitable for the frequency modulation stage; only cutting a local cutting area of the cavity body of the radio frequency electron accelerator, to precisely adjust the current intrinsic frequency of the cavity body to reach the target intrinsic frequency or to fall within an allowable error range of the target intrinsic frequency.

10. The local frequency modulation method according to claim 9, wherein, the local cutting adopts a plurality of cutting to ensure a machining accuracy, and a cutting shape is a superimposition of horizontal square areas or vertical square areas, or a superimposition of inclined triangular areas.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings that need to be used in the embodiments are described in detail below. It should be understood that these drawings only show certain embodiments of the present invention, and therefore they should not be regarded as a limitation to the scope of the present invention. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] FIG. 1 is a schematic diagram of the radio frequency electron accelerator structure A for local frequency modulation according to the present invention.

[0030] FIG. 2 is a schematic diagram of the cutting area of the radio frequency electron accelerator structure A for local frequency modulation according to the present invention.

[0031] FIG. 3 is a schematic diagram of the radio frequency electron accelerator structure B for local frequency modulation of the present invention.

[0032] FIG. 4 is an enlarged view of portion C circled in FIG. 3.

[0033] FIG. 5 is a schematic diagram of the overall cutting of the frequency modulation stage according to the prior art.

[0034] FIG. 6 is an enlarged view of portion A circled in FIG. 5.

[0035] FIG. 7 is a schematic diagram showing the structure of the local cutting in the frequency modulation stage according to the present invention.

[0036] FIG. 8 is an enlarged view of portion B circled in FIG. 7.

[0037] FIGS. 9A-9C are schematic diagrams showing a local frequency modulation method for a radio frequency electron accelerator of the present invention with the vertical square area superimposed cutting according to the present invention.

[0038] FIGS. 10A-10C are schematic diagrams showing a local frequency modulation method for a radio frequency electron accelerator with the horizontal square area superimposed cutting according to the present invention.

[0039] FIGS. 11A-11C are schematic diagrams showing a local frequency modulation method for a radio frequency electron accelerator with the inclined triangular area superimposed cutting according to the present invention.

[0040] In the figures: 1-accelerating cavity; 2-coupling cavity; 3-coupling hole; 4-beam hole; 5-accelerating cavity component; 6-coupling cavity component; 701-accelerating cavity local cutting area; 702-coupling cavity local cutting area; 8-overall cutting area; 9-first overall cutting area; 10-second overall cutting area; 11-third overall cutting area; 12-first local cutting area; 13-second local cutting area; and 14-third local cutting area.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] In order to explain the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are described below clearly and completely. Obviously, the described embodiments are a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention. Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0042] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once a term is defined in one drawing, it may not be further defined and explained in the subsequent drawings.

Embodiment 1

[0043] As shown in FIG. 1 and FIG. 2, a radio frequency electron accelerator structure for local frequency modulation, includes the accelerating cavity 1, the coupling cavity 2 and the beam hole 4. The accelerating cavity 1 and the coupling cavity 2 are alternately assembled together, and the beam hole 4 penetrates the accelerating cavity 1 and the coupling cavity 2. A local cutting area is arranged inside the accelerating cavity 1 and the coupling cavity 2. The accelerator is provided with the coupling hole 3. As shown in FIG. 1, a notch is left inside both the accelerating cavity and the coupling cavity after local cutting, and the notch is shaped as a rectangular recess.

[0044] The overall structure of the accelerator can be changed according to actual conditions and needs, and its components can also be adjusted. The following two accelerator structures are exemplified to illustrate the specific applications of local cutting.

[0045] Accelerator structure A: as shown in FIG. 1 and FIG. 2, the final structure of the accelerator after local cutting is to form a circular groove in the middle of the accelerating cavity and on the edge of the coupling cavity of the accelerator, respectively. The accelerating cavity 1 and the coupling cavity 2 are formed by the alternate superimposition of the coupling cavity component 6 and the accelerating cavity component 5, that is, the entire accelerator is formed by superimposing the accelerating cavity component 5 and the coupling cavity component 6. A complete coupling cavity contour is provided on the left side of the coupling cavity component 6, and the left side of the coupling cavity component 6 is open. One half of a cavity body of the accelerating cavity is provided on the right side of the coupling cavity component, and the opening surface of the cavity body is configured to face the right side of the accelerating cavity. The other half of the cavity body of the accelerating cavity is provided on the left side of the accelerating cavity component 5, and the opening surface of the cavity body is configured to face the left side of the accelerating cavity. The wall surface of the right side of the accelerating cavity component serves as a closed surface of the coupling cavity.

[0046] The accelerating cavity local cutting area 701 on any one of the coupling cavity component and the accelerating cavity component is limited to an area shaped as a ring configured to have a cross section of a 1×1 mm square. The ring is located on the joint plane of the accelerating cavity component 5 and the coupling cavity component 6. The inner diameter of the ring is equal to the inner diameter of the cavity body of the accelerating cavity. The cutting area in the accelerating cavity is located in the middle of the accelerating cavity, on the joint plane of the accelerating cavity component 5 and the coupling cavity component 6. Additionally, the machining position is on the edges of after the splitting of the accelerating cavity component 5 and the coupling cavity component 6.

[0047] The accelerating cavity local cutting area is located on the coupling cavity component 6 and the accelerating cavity component 5, respectively, and a starting plane is a plane where the coupling cavity component 6 and the accelerating cavity component 5 joint together to form the accelerating cavity. The accelerating cavity local cutting area on the coupling cavity component 6 and the accelerating cavity component 5 integrally forms an annular area of 2×1 mm.

[0048] The coupling cavity local cutting area 702 is limited to an area shaped as a ring configured to have a cross section of a 0.5×0.5 mm square. The ring is is located on the edge of the coupling cavity of the coupling cavity component 6, parallel to the joint plane of the accelerating cavity component 5 and the coupling cavity component 6. The inner diameter of the ring is equal to the inner diameter of the cavity body of the coupling cavity. In other words, the ring is located on the coupling cavity component, a starting plane is a plane where the accelerating cavity component and the coupling cavity component joint together to form the coupling cavity, and the inner diameter of the ring is equal to the inner diameter of the cavity body of the coupling cavity.

[0049] A matching ladder is provided on two ends of the accelerating cavity component 5 and the coupling cavity component 6 to facilitate the installation of the accelerating cavity component 5 and the coupling cavity component 6.

[0050] Accelerator structure B: as shown in FIG. 3 and FIG. 4, the final structure of the accelerator after local cutting is to form a circular groove on the edge of the accelerating cavity and the edge of the coupling cavity of the accelerator, respectively. The accelerating cavity and the coupling cavity are formed by the interval superimposition of the accelerating cavity component and the coupling cavity component. The accelerating cavity component is provided with a complete accelerating cavity, and the coupling cavity component is provided with a complete coupling cavity.

[0051] The accelerating cavity local cutting area 701 is limited to an area shaped as a ring configured to have a cross section of a 1×1 mm square, the ring extends from the joint plane of the accelerating cavity component and the coupling cavity component to the accelerating cavity, and the inner diameter of the ring is equal to the inner diameter of the cavity body of the accelerating cavity.

[0052] The coupling cavity local cutting area 702 is limited to an area shaped as a ring configured to have a cross section of a 0.5×0.5 mm square, and the ring extends from the joint plane of the accelerating cavity component and the coupling cavity component to the coupling cavity. In other words, the ring is located on the coupling cavity component, and a starting plane is a plane where the coupling cavity component and the accelerating cavity component joint together to form the coupling cavity. The inner diameter of the ring is equal to the inner diameter of the cavity body of the coupling cavity.

[0053] As shown in FIG. 5 and FIG. 6, the traditional method of adjusting the intrinsic frequency of the cavity body of the accelerating cavity of the electron accelerator to be greater than the target value is to increase the inner diameter R, i.e., the inner diameter R of the cavity body, by cutting the inner wall of the cavity body of the accelerating cavity. Because the area of the wall surface of the cavity body of the accelerating cavity involved in the cutting portion is relatively large, even a small amount of cutting will cause the volume of the cavity body of the accelerating cavity to change greatly. Thus, it is easy to cause the intrinsic frequency of the cavity body of the accelerating cavity to decrease during the adjusting process, and it is difficult to control the data, and the required machining accuracy is also very high. The operation is to successively cut the first overall cutting area 9, the second overall cutting area 10, and the third overall cutting area 11. This cutting process includes the rough turning stage and the frequency modulation stage of the accelerator in the prior art.

[0054] As shown in FIG. 7 and FIG. 8, the local frequency modulation method for the accelerator in the present invention is designed based on the radio frequency electron accelerator structure for local frequency modulation. Of course, the above-mentioned two accelerator structures are only two arrangement manners of the local cutting position designed according to the configuration of the accelerator. The general idea is to arrange the local cutting area on the edge of the part to facilitate processing, which is designed according to practical needs. Theoretically, the local cutting area can be arranged inside each cavity body. Since the cavity body of the accelerating cavity is formed by the cooperation of the accelerating cavity component 55 and the coupling cavity component 66, it is very convenient to perform cutting, polishing, and other operations on the wall surfaces of the upper and lower ends of the cavity body of the accelerating cavity component 55 and the coupling cavity component 66, and only a small area need to be cut. When the feed amount is large, the change in the volume of the cavity body of the accelerating cavity is small, so that the change in the intrinsic frequency of the cavity change is small. Therefore, it is easy to control the data, and the required machining accuracy are also reduced.

[0055] The present invention provides a local frequency modulation method for a radio frequency electron accelerator. The accelerating cavity component 5 and the coupling cavity component 6 joint together to form the accelerator. In the machining process, the accelerating cavity component 5 and the coupling cavity component 6 are first separated, and then a cutting is performed on a wall surface of a cavity body that is formed by the accelerating cavity component 5 and the coupling cavity component 6, and finally the accelerating cavity component 5 and the coupling cavity component 6 are assembled into a complete accelerating tube. The cutting is divided into a rough turning stage and a frequency modulation stage, and the cutting is performed as follows.

[0056] (1) Overall cutting: suitable for the rough turning stage. When each wall surface of the accelerator that is formed by the accelerating cavity component 5 and the coupling cavity component 6 is cut into a plurality of components meeting the specifications according to drawings, an inner surface of the cavity body of the accelerator is integrally cut to quickly reduce a difference between a current intrinsic frequency and a target intrinsic frequency of the cavity body of the accelerating cavity and leave the machining allowance for the frequency modulation stage. In FIG. 8, the overall cutting area 8 represents the cutting position at the rough turning stage.

[0057] (2) Local cutting: suitable for the frequency modulation stage. The local cutting area of the cavity body of the accelerator that is formed by the accelerating cavity component 5 and the coupling cavity component 6 is only cut to precisely adjust the current intrinsic frequency of the cavity body to reach the target intrinsic frequency or to fall within an allowable error range of the target intrinsic frequency. In FIG. 8, the accelerating cavity local cutting area 701 and the coupling cavity local cutting area 702 represent the cutting positions at the frequency modulation stage.

[0058] The local cutting adopts a plurality of cutting to ensure the machining accuracy, and the cutting shape is the superimposition of horizontal or vertical square areas, or the superimposition of inclined triangular areas. There is no specific shape for cutting in the local cutting area, as long as the volume of the cavity body can be changed by cutting, but for the convenience of machining and the calculation and control for the volume of the cutting, it is necessary to optimize the current cutting method to develop a more convenient machining method. The machining method adopts the successive superimposition. When machining the local cutting area of the part, the shape of each machining adopts the superimposition of a rectangle, or an inverted triangle to realize the controllable calculation of the volume of the cutting. FIGS. 9A-9C show the superimposition of vertical rectangular cutting. FIGS. 10A-10C show the superimposition of horizontal rectangular cutting. FIGS. 11A-11C shows the superimposition of chamfering operations, namely the superimposition of triangular cutting. The shaded areas indicate the first local cutting area 12, the second local cutting area 13, and the third local cutting area 14 successively.

[0059] In the description of the present invention, it should be understood that the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner/inside”, “outer/outside”, “clockwise”, “counterclockwise”, and other orientations or positional relationships are based on the orientations or positional relationships shown in the figures, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the pointed device or element must have a specific orientation, or must be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation to the present invention.

[0060] In the description of the present invention, unless otherwise clearly specified and defined, “mount”, “connect to each other”, “connect”, “fix”, and other terms should be understood broadly. For example, the term “connect” can be understood as, fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, direct connection, indirect connection through an intermediate media, internal communication of the two elements, or interaction between the two elements. For those having ordinarily skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific situations.

[0061] In the present invention, unless otherwise clearly specified and defined, the first feature “on” or “under” the second feature can include direct contact of the first and second features, and can also include contact of the first and second through another feature therebetween instead of the direct contact. Moreover, the first feature “above” and “on” the second feature includes the first feature directly above and diagonally above the second feature, or simply means that the first feature has a higher level than the second feature. The first feature “under” the second feature includes the first feature directly under and diagonally under the second feature, or simply means that the first feature has a lower level than the second feature.

[0062] The above is only the preferred embodiments of the present invention. It should be pointed out that the above preferred embodiments shall not be regarded as a limitation on the present invention, and the scope of protection of the present invention shall be subject to the scope defined in the claims. For those skilled in the art, several improvements and refinements can be made without departing from the spirit and scope of the present invention, and such improvements and refinements shall also fall within the protection scope of the present invention.