Miniaturized beam unit module

Abstract

The utility model discloses a miniaturized beam unit module, and belongs to the technical field of electron linear accelerators. A miniaturized beam unit module comprises a magnetron assembly, a microwave system, a circulator assembly, an accelerating tube assembly, a primary collimating cone assembly and a fixed bottom plate. The magnetron assembly, the microwave system, the circulator assembly, the accelerating tube assembly and the primary collimating cone assembly are fixedly mounted on the fixed bottom plate; the magnetron assembly comprises a magnetron, and the magnetron is used for generating microwaves; the accelerating tube assembly comprises an accelerating tube; the microwave system is used for connecting the magnetron and the accelerating tube and feeding microwaves generated by the magnetron into the accelerating tube; the circulator assembly comprises a circulator, a waveguide port of the circulator is higher than a waveguide port of the magnetron, the circulator is arranged in the microwave system, and the circulator is used for isolating microwave power fed back to the magnetron; the position of the magnetron is moved downwards, so that the height of the waveguide port of the magnetron is lower than that of the waveguide port of the four-end circulator, and the purpose of miniaturization of the beam unit module is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electron linear accelerators, and more specifically to a miniaturized beam unit module. Background Art

[0002] Medical accelerators are the most commonly used devices in the field of radiotherapy. Currently, most of the beam unit modules of medical accelerators in the industry adopt an S-band structure. Due to wavelength limitations, the acceleration tube, microwave system, power source and other components are large in size, resulting in a large size and weight for the entire accelerator.

[0003] After searching, the existing patent document with publication number CN114980475A provides an X-band small focus accelerator for nondestructive testing. The accelerating tube of the device adopts an X-band accelerating tube. Compared with the existing S-band accelerating tube, the microwave frequency of the X-band is higher. When the electron beam energy is the same, the volume of the X-band accelerating tube is smaller. Correspondingly, the shielding volume around the accelerating tube is also smaller, achieving the purpose of miniaturizing the accelerator. However, in the above technical solution, the magnetron is directly connected to the waveguide port of the four-end circulator through a straight waveguide. Since the magnetron itself is relatively large, the above connection method will increase the overall height of the device, which is not conducive to the miniaturization of the device.

[0004] In order to miniaturize the linear accelerator, we propose a miniaturized beam unit module. Summary of the invention

[0005] The purpose of the utility model is to provide a miniaturized beam unit module to solve the problems raised in the above background technology.

[0006] The utility model is realized by the following technical solutions:

[0007] A miniaturized beam unit module includes a magnetron assembly, a microwave system, a circulator assembly, an accelerating tube assembly, a primary collimating cone assembly and a fixed base plate;

[0008] The magnetron assembly, microwave system, circulator assembly, accelerating tube assembly and primary collimating cone assembly are all fixedly mounted on a fixed base plate;

[0009] The magnetron assembly comprises a magnetron, and the magnetron is used to generate microwaves;

[0010] The accelerating tube assembly comprises an accelerating tube, and the accelerating tube is used to accelerate the flow velocity of electrons inside the accelerating tube;

[0011] The microwave system is used to connect the magnetron and the accelerating tube, and to feed the microwave generated by the magnetron into the accelerating tube;

[0012] The circulator assembly comprises a circulator, the waveguide opening of the circulator is higher than the waveguide opening of the magnetron, the circulator is arranged in the microwave system, and the circulator is used to isolate the microwave power fed back to the magnetron;

[0013] The primary collimating cone assembly is used to adjust the diffusion direction and range of the X-rays.

[0014] As an optional solution of the technical solution of the present application document, the installation directions of the accelerating tube, the magnetron and the circulator are parallel to each other, and the magnetron and the circulator are respectively installed on both sides of the accelerating tube.

[0015] As an optional solution of the technical solution of the present application document, the microwave system includes a curved waveguide, which is inclined at 45 degrees and is fixedly installed at the waveguide port of the magnetron. The waveguide port of the curved waveguide is at the same height as the waveguide port of the circulator.

[0016] As an optional solution of the technical solution of the present application document, the microwave system also includes a twisted waveguide, the waveguide openings of the twisted waveguide and the curved waveguide are both rectangular, and the twisting angle of the twisted waveguide is 90 degrees.

[0017] As an optional solution of the technical solution of the present application document, the microwave system includes a flexible waveguide, and the flexible waveguide is connected between the magnetron and the circulator and between the circulator and the accelerating tube.

[0018] As an optional solution of the technical solution of this application document, the accelerating tube assembly also includes an accelerating tube body protection, and the accelerating tube body protection is divided into an upper and lower part, and the accelerating tube is located between the upper and lower parts of the accelerating tube body protection.

[0019] As an optional solution of the technical solution of this application document, the primary collimating cone assembly includes an accelerating tube target and a primary collimating cone, the accelerating tube target is used to generate X-rays, and the primary collimating cone is used to adjust the diffusion direction and range of the X-rays;

[0020] The accelerating tube target adopts a convex target structure and is installed inside the primary collimating cone.

[0021] As an optional solution of the technical solution of this application document, the circulator adopts a four-terminal circulator.

[0022] As an optional solution of the technical solution of this application document, the accelerating tube is an X-band accelerating tube.

[0023] As an optional solution of the technical solution of this application document, the fixed base plate is made of aluminum.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] 1. The present application achieves the purpose of miniaturizing the beam unit module by moving the magnetron downward so that the waveguide port of the magnetron is lower than the waveguide port of the four-terminal circulator and by adding a 45-degree bend waveguide at the waveguide port of the magnetron to reduce the overall height of the beam unit module.

[0026] 2. The accelerating tube of the present application adopts an X-band structure. Compared with the S-band accelerating tube used in traditional accelerators, the accelerating tube is smaller in size and lighter in weight.

[0027] 3. The present application adds a soft waveguide to the microwave system. By utilizing the ability of the soft waveguide to withstand a certain degree of deformation, part of the installation stress can be eliminated during installation to prevent damage to components such as the magnetron and the accelerating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a miniaturized beam unit module;

[0029] Figure 2 It is a schematic diagram of an accelerating tube assembly of a miniaturized beam unit module;

[0030] Figure 3 It is a schematic diagram of an accelerating tube assembly after removing the top protection of the accelerating tube from a miniaturized beam unit module;

[0031] Figure 4 It is a cross-sectional view of the assembled accelerating tube target and primary collimating cone of a miniaturized beam unit module;

[0032] Figure 5 It is a schematic diagram of the assembly of a microwave system and a four-terminal circulator of a miniaturized beam unit module;

[0033] Figure 6 It is a schematic diagram of a magnetron assembly of a miniaturized beam unit module;

[0034] Figure 7 It is a schematic diagram of a circulator assembly of a miniaturized beam unit module;

[0035] Figure 8 It is a schematic diagram of the primary collimation cone assembly of a miniaturized beam unit module;

[0036] Fig. 9 It is a schematic diagram of the twisted waveguide structure of a miniaturized beam unit module;

[0037] In the figure: 1. magnetron assembly; 2. microwave system; 3. circulator assembly; 4. accelerating tube assembly; 5. primary collimating cone assembly; 6. fixed bottom plate; 7. accelerating tube body protection; 8. accelerating tube; 9. accelerating tube target; 10. primary collimating cone; 11. 45-degree curved waveguide; 12. 90-degree curved waveguide A; 13. flexible waveguide A; 14. 90-degree curved waveguide B; 15. twisted waveguide; 16. 90-degree curved waveguide C; 17. straight waveguide; 18. 90-degree curved waveguide D; 19. 90-degree curved waveguide E; 20. flexible waveguide B; 21. 90-degree curved waveguide F; 22. magnetron; 23. magnetron bracket; 24. circulator; 25. circulator bracket; 27. primary collimating cone bracket. DETAILED DESCRIPTION

[0038] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0039] See also Figure 1 The utility model discloses a miniaturized beam unit module, comprising a magnetron assembly 1, a microwave system 2, a circulator assembly 3, an accelerating tube assembly 4, a primary collimating cone assembly 5, and a fixed bottom plate 6. The fixed bottom plate 6 is made of aluminum to reduce weight. The magnetron assembly 1, the microwave system 2, the circulator assembly 3, the accelerating tube assembly 4, and the primary collimating cone assembly 5 are respectively fixed on the fixed bottom plate 6 through brackets.

[0040] See also Figure 2-Figure 3 The accelerating tube assembly 4 includes an accelerating tube 8 and an accelerating tube body protection 7. The accelerating tube 8 adopts an X-band structure. Compared with the S-band accelerating tube adopted by the traditional accelerator, the accelerating tube is smaller in size and lighter in weight. The accelerating tube body protection 7 is made of lead and is designed according to the size of the accelerating tube 8. It is divided into two layers, the upper and lower layers. The accelerating tube 8 can be installed inside, so there is no need to add other tube body protections.

[0041] See also Figure 4 The primary collimator cone assembly 5 includes an accelerating tube target 9 and a primary collimator cone 10. In order to reduce the volume and weight of the primary collimator cone 10, the accelerating tube target 9 is specially designed and adopts a convex target structure. At the same time, the primary collimator cone 10 is specially designed according to the size of the accelerating tube target 9. The accelerating tube target 9 can be installed inside the primary collimator cone 10. With this structure, the volume and weight of the primary collimator cone can be greatly reduced.

[0042] See also Figure 5The magnetron assembly 1 includes a magnetron 22 and a magnetron support 23, and the circulator assembly 3 includes a circulator 24 and a circulator support 25; in this embodiment, the circulator 24 adopts a four-end circulator; due to the size of the magnetron 22 and the four-end circulator 24 and the position of the waveguide port, the four-end circulator 24 and the magnetron 22 are both placed in parallel with the accelerating tube 8, but since the magnetron 22 itself is relatively large, if the height is the same as the waveguide port of the four-end circulator 24, the overall height of the beam unit module will increase. Therefore, the height of the magnetron 22 is lower than that of the four-end circulator 24 in the design, and the overall height of the beam unit module is reduced by adding a 45-degree curved waveguide 11 at the waveguide port of the magnetron 22.

[0043] In addition, the waveguide flange used in the X-band structure is WR112. The waveguide port of the flange is a rectangular structure, which is divided into a long side and a short side. When assembling the microwave system, the waveguide ports must be completely overlapped without misalignment, that is, the long side overlaps with the long side, and the short side overlaps with the short side. In this beam unit module, although the waveguide port of the magnetron 22 after the 45-degree bend waveguide 11 and the waveguide port of the four-end circulator 24 are highly consistent, the long side and the short side are exactly 90 degrees apart. Therefore, the structure of the twisted waveguide 15 is used at this position. The structure of the twisted waveguide 15 is to rotate the position of the long side and the short side of the waveguide port by 90 degrees, so that the waveguide port of the magnetron 22 and the waveguide port of the four-end circulator 24 overlap without misalignment. At the same time, for the convenience of assembly, soft waveguides A13 and B20 are added to the microwave system. The soft waveguides can withstand a certain degree of deformation, and can eliminate part of the installation stress during installation to prevent damage to the magnetron 22, the accelerating tube 8 and other components.

[0044] In this beam unit module, in order to make the layout of the entire accelerator more compact, a twist waveguide 15 and multiple curved waveguides are used; the 45-degree curved waveguide 11 is connected to the magnetron 22, and is connected to the four-end circulator 24 through the 90-degree curved waveguide A12, the soft waveguide A13, the 90-degree curved waveguide B14, the twist waveguide 15, and the 90-degree curved waveguide C16. The three and four ports of the four-end circulator 24 are respectively equipped with a water load and a dry load. The two ports of the four-end circulator 24 are connected to the accelerating tube 8 through the straight waveguide 17, the 90-degree curved waveguide D18, the 90-degree curved waveguide E19, the soft waveguide B20, and the 90-degree curved waveguide F21.

[0045] See also Figure 6 The magnetron 22 is mounted on a magnetron support 23, and the magnetron support 23 is mounted on a fixed base plate 6. Figure 7 , the circulator 24 is mounted on the circulator bracket 25, and the circulator bracket 25 is mounted on the fixed base plate 6. Figure 8The primary collimator cone 10 is mounted on the primary collimator cone bracket 27, and the primary collimator cone bracket 27 is mounted on the fixed base plate 6. In order to reduce the overall weight of the beam unit module, the magnetron bracket 23, the circulator bracket 25, and the primary collimator cone bracket 27 are all made of aluminum.

[0046] When the miniaturized beam unit module in this patent is used, the magnetron 22 is used as a power source to output high-power microwaves, which are finally fed into the accelerating tube 8 through the microwave system 2 and the circulator 24. The high-power microwaves are accelerated inside the accelerating tube to finally produce rays for target shooting, which are led out by the primary collimating cone 10 for treatment. This beam unit module has a compact structure, a small shape, and a light weight. It can be used not only in traditional medical accelerators, but also in accelerators such as intraoperative radiotherapy and mobile radiotherapy.

Claims

1. A miniaturized beam unit module, characterized in that: It comprises a magnetron assembly (1), a microwave system (2), a circulator assembly (3), an accelerating tube assembly (4), a primary collimating cone assembly (5) and a fixed base plate (6); The magnetron assembly (1), the microwave system (2), the circulator assembly (3), the accelerating tube assembly (4) and the primary collimating cone assembly (5) are all fixedly mounted on a fixed base plate (6); The magnetron assembly (1) comprises a magnetron (22), and the magnetron (22) is used to generate microwaves; The accelerating tube assembly (4) comprises an accelerating tube (8), and the accelerating tube (8) is used to accelerate the flow rate of electrons inside the accelerating tube; The microwave system (2) is used to connect the magnetron (22) and the accelerating tube (8), and is used to feed the microwaves generated by the magnetron (22) into the accelerating tube (8); The circulator assembly (3) comprises a circulator (24), the waveguide opening of the circulator (24) is higher than the waveguide opening of the magnetron (22), the circulator (24) is arranged in the microwave system (2), and the circulator (24) is used to isolate the microwave power fed back to the magnetron (22); The primary collimating cone assembly (5) is used to adjust the diffusion direction and range of X-rays.

2. The miniaturized beam unit module according to claim 1, characterized in that: The installation directions of the accelerating tube (8), the magnetron (22) and the circulator (24) are parallel to each other, and the magnetron (22) and the circulator (24) are respectively installed on both sides of the accelerating tube (8).

3. The miniaturized beam unit module according to claim 1, characterized in that: The microwave system (2) comprises a curved waveguide (11), the curved waveguide (11) is inclined at 45 degrees, the curved waveguide (11) is fixedly installed at the waveguide opening of the magnetron (22), and the waveguide opening of the curved waveguide (11) and the waveguide opening of the circulator (24) are located at the same height.

4. The miniaturized beam unit module according to claim 2, characterized in that: The microwave system (2) further comprises a twisted waveguide (15), wherein the waveguide openings of the twisted waveguide (15) and the curved waveguide (11) are both rectangular, and the twist angle of the twisted waveguide (15) is 90 degrees.

5. The miniaturized beam unit module according to claim 1, characterized in that: The microwave system (2) comprises a flexible waveguide, wherein the flexible waveguide is connected between the magnetron (22) and the circulator (24) and between the circulator (24) and the accelerating tube (8).

6. The miniaturized beam unit module according to claim 1, characterized in that: The accelerating tube assembly (4) further comprises an accelerating tube body protection (7), wherein the accelerating tube body protection (7) is divided into an upper and a lower part, and the accelerating tube (8) is located between the upper and lower parts of the accelerating tube body protection (7).

7. The miniaturized beam unit module according to claim 1, characterized in that: The primary collimating cone assembly (5) comprises an accelerating tube target (9) and a primary collimating cone (10), wherein the accelerating tube target (9) is used to generate X-rays, and the primary collimating cone (10) is used to adjust the diffusion direction and range of the X-rays; The accelerating tube target (9) adopts a convex target structure, and the accelerating tube target (9) is installed inside the primary collimating cone (10).

8. The miniaturized beam unit module according to claim 1, characterized in that: The circulator (24) is a four-end circulator.

9. The miniaturized beam unit module according to claim 1, characterized in that: The accelerating tube (8) is an X-band accelerating tube.

10. The miniaturized beam unit module according to claim 1, characterized in that: The fixed bottom plate (6) is made of aluminum.

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