Medical particle accelerator magnet vacuum device

Abstract

The application discloses a medical particle accelerator magnet vacuum device and belongs to the technical field of magnet vacuum devices. The medical particle accelerator magnet vacuum device comprises a vacuum cylinder, a vacuum cavity is formed in the inner side of the vacuum cylinder, and a filtering assembly, an electron acceleration tube, a sealing assembly and a movable focusing assembly are sequentially arranged in the inner side of the vacuum cavity. The application solves the problem that the focusing structure of a common electron linear accelerator is a fixed structure and cannot be moved, so that the diameter of a particle beam cannot be controlled and adjusted by adjusting the position of the focusing structure. Moreover, the existing electron beam observation structure cannot obviously and intuitively observe the electron beam. In the application, part of the magnetic field generated by the focusing electromagnetic coil II interferes with the electron beam in the vacuum cavity through the magnetic permeable groove and the matching groove, so that the electron beam is focused. The relative position of the magnetic field and the electron beam is adjusted by adjusting the relative position of the matching groove and the magnetic permeable groove.

Description

Technical Field

[0001] This invention belongs to the technical field of magnetic vacuum devices, specifically relating to a magnetic vacuum device for a medical particle accelerator. Background Technology

[0002] Medical accelerators are particle accelerator devices used in biomedicine for radiotherapy of tumors. Charged particle accelerators are electromagnetic devices that use artificial methods to accelerate various types of charged particles to higher energies using electric fields of different forms. They are commonly called "particle accelerators" or simply "accelerators". To give charged particles energy, there must be an accelerating electric field. Accelerators are classified into various types according to the different types of accelerated particles, the different forms of accelerating electric fields, and the different trajectories followed by the particle acceleration process. Internationally, electron linear accelerators are the most commonly used in radiotherapy.

[0003] Common electron linear accelerator focusing structures are fixed and cannot move, which makes it impossible to control and adjust the diameter of the particle beam by adjusting the position of the focusing structure. Moreover, existing electron beam observation structures cannot clearly and intuitively observe the shape of the electron beam. Therefore, a medical particle accelerator magnet vacuum device is proposed. Summary of the Invention

[0004] This invention provides a medical particle accelerator magnet vacuum device, which aims to solve the problems of common electron linear accelerators having fixed and immobile focusing structures, making it impossible to control and adjust the particle beam diameter by adjusting the position of the focusing structure. Furthermore, existing electron beam observation structures cannot clearly and intuitively observe the state of the electron beam.

[0005] The present invention provides a medical particle accelerator magnet vacuum device, including a vacuum cylinder, a vacuum chamber is formed on the inner side of the vacuum cylinder, and a filter assembly, an electron accelerator tube, a sealing assembly and a movable focusing assembly are arranged sequentially on the inner side of the vacuum chamber, and a radiation source is arranged in the middle of one end of the inner side of the vacuum chamber.

[0006] The filtration assembly includes two filter discs, two annular magnets, and four absorption discs. Each of the two filter discs has an absorption disc on each side. Each filter disc has a circular groove in the middle. Each filter disc has an annular magnet in the middle of its inner side. Each absorption disc has a through hole in the middle.

[0007] An exhaust pipe is provided on the outer side of one end of the vacuum chamber, and a vacuum machine is provided on one side of the exhaust pipe. The exhaust pipe is n-shaped, and the two ends of the exhaust pipe are located on both sides of the filter assembly.

[0008] An observation mechanism is provided in the middle of the other side of the vacuum cylinder.

[0009] Furthermore, a front end cap is provided at one end of the inner side of the vacuum cylinder, and a channel is opened in the middle of the front end cap.

[0010] By adopting the above scheme, the front cover is used to cover one end of the vacuum chamber.

[0011] Furthermore, a deflection groove is provided at one end of the vacuum cylinder, a deflection plate is hinged to the middle of the inner side of the deflection groove, and a flat permanent magnet is provided on one side of the deflection plate.

[0012] By adopting the above scheme, the deflection plate can be used to adjust the direction of the electron beam.

[0013] Furthermore, the sealing assembly includes a sealing disc, an absorption disc, a sealing disc, an accelerating coil, a discharge groove, and an aperture. The sealing disc is disposed at one end of the inner side of the vacuum chamber. A sealing disc is disposed at each end of the sealing disc. A through groove is formed in the middle of the sealing disc. An accelerating coil is disposed around the circumference of the through groove. A discharge groove is formed in the middle of the sealing disc. An aperture is installed on one side of the inner side of the discharge groove. An absorption disc is disposed on each side of one of the sealing discs. An absorption disc is disposed on the side of the other sealing disc near the sealing disc.

[0014] By adopting the above scheme, the sealing component keeps the inside of the vacuum chamber under vacuum, thereby greatly reducing the obstruction and kinetic energy loss of the electron beam. The electron beam is emitted through the sealing component, and the magnetic field of the accelerating coil accelerates the electrons to a certain extent. The absorption disk can absorb discrete particles.

[0015] Furthermore, both the accelerating coil and the annular magnet are annular permanent magnets, and the materials of the enclosed disk, the absorption disk, and the filter disk are all copper.

[0016] By employing the above method, copper can shield and block electromagnetic fields as well as absorb particles.

[0017] Furthermore, the observation mechanism includes a gate, a fluorescent coating, a sealing cylinder, an observation cylinder one, a glass column, a light reflector, and an observation cylinder two. A stepper motor is installed inside the vacuum cylinder, and the rotating rod of the stepper motor is connected to the gate. The gate is located between the annular magnet one and the electron accelerator tube, in the middle of the inner side of the vacuum cavity. A fluorescent coating is installed on one side of the gate. A sealing cylinder is inserted into the middle of one side of the vacuum cylinder. An observation cylinder one is inserted into the inner side of the sealing cylinder. One end of the observation cylinder one is bent at 90 degrees. The shape of the observation cylinder one is L-shaped. An observation cylinder two is installed at the end of the observation cylinder one away from the vacuum cylinder. The central axis of the observation cylinder two is perpendicular to the central axis of one end of the observation cylinder one. An observation lens is installed inside one end of the observation cylinder two. Two parallel light reflectors are installed inside the end of the observation cylinder one away from the vacuum cylinder. The light reflectors are at a 45-degree angle to the horizontal plane. A glass column is installed inside the end of the light reflectors located in the vacuum cavity.

[0018] By adopting the above scheme, the rotation of the gate makes the outer side of the fluorescent coating form a 45-degree angle with the axis of the vacuum cylinder. The particles hit the surface of the fluorescent coating and emit light. The observation mechanism can analyze the electron beam by observing the shape and brightness of the light spot on the fluorescent coating. The light emitted by the light spot on the fluorescent coating enters the inner cavity of the first observation cylinder, and then enters the inner side of the second observation cylinder after being reflected by two light reflectors, and finally reaches the observation lens for observation.

[0019] Furthermore, the movable focusing assembly includes a servo cylinder, a movable collar, a coil cavity, and a second focusing electromagnetic coil. A mating groove is formed at one end of the inner side of the vacuum cavity. A glass tube is inserted into the inner side of the vacuum cavity, with the outer side of the glass tube located inside the mating groove. A movable collar is fitted onto the outer side of the vacuum cylinder. A coil cavity is located inside the movable collar, and a second focusing electromagnetic coil is located inside the coil cavity. An annular shell is installed on one side of the coil cavity. A servo cylinder is fixedly connected to the outer side of one end of the vacuum cylinder. The movable end of the servo cylinder is fixedly connected to one end of the movable collar. A magnetically permeable groove is formed at one end of the inner side of the coil cavity. An annular plug is inserted into the inner side of the magnetically permeable groove. The magnetically permeable groove corresponds to the mating groove, and their relative positions are variable.

[0020] By adopting the above scheme, part of the magnetic field generated by the second focusing electromagnetic coil interferes with the electron beam in the vacuum cavity through the magnetic permeable groove and the matching groove, thereby focusing the electron beam. By adjusting the relative position of the matching groove and the magnetic permeable groove, the relative position of the magnetic field and the electron beam can be adjusted, thereby continuously adjusting the focusing position of the electron beam and thus adjusting the diameter of the electron beam.

[0021] Furthermore, a baffle seat is provided at the connection between the exhaust pipe and the vacuum chamber, and a filter plate is provided on one side of the baffle seat. The baffle seat is a cuboid with a U-shaped groove on one side.

[0022] By adopting the above solution, the bending structure of the baffle seat can prevent particles from directly entering the inside of the exhaust pipe.

[0023] Furthermore, a fixed magnetic lens is provided on the outer side of the vacuum cylinder, and a focusing electromagnetic coil is provided on the inner side of the fixed magnetic lens, with the fixed magnetic lens corresponding to the sealing disc.

[0024] By adopting the above scheme, the focusing electromagnetic coil can adjust the magnetic field as needed to increase the speed of electrons in the particle beam, allowing electrons to pass through the aperture more effectively.

[0025] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects:

[0026] 1. In this invention, by using the active focusing component, part of the magnetic field generated by the second focusing electromagnetic coil interferes with the electron beam in the vacuum cavity through the magnetic permeable groove and the mating groove, so that the electron beam is focused. By adjusting the relative position of the mating groove and the magnetic permeable groove, the relative position of the magnetic field and the electron beam can be adjusted, thereby continuously adjusting the position where the electron beam is focused, and thus adjusting the diameter of the electron beam.

[0027] 2. In this invention, through observation tube one, observation lens, observation tube two, fluorescent coating and light reflector, the rotation of the gate makes the outer side of the fluorescent coating form an angle of 45 degrees with the axis of the vacuum tube. Particles hit the surface of the fluorescent coating and generate light emission. The observation mechanism can analyze the electron beam by observing the shape, size and brightness of the light spot on the fluorescent coating. The light emitted from the light spot on the fluorescent coating enters the inner cavity of observation tube one, and then enters the inner side of observation tube two after being reflected by two light reflectors, and finally reaches the observation lens for observation. This observation method is more obvious and intuitive.

[0028] 3. In this invention, the inner side of the vacuum chamber is kept vacuum by the sealing component, thereby greatly reducing the obstruction and kinetic energy loss of the electron beam. The electron beam is emitted through the sealing component, and the magnetic field of the accelerating coil accelerates the electrons to a certain extent. The absorption disk can absorb discrete particles, preventing discrete particles from reaching the outside of the vacuum chamber and hitting the human body, causing damage.

[0029] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 This is a cross-sectional view of the front of the present invention;

[0032] Figure 2 For the present invention Figure 1 A partially enlarged structural diagram of part A in the middle;

[0033] Figure 3 For the present invention Figure 1 A partially enlarged structural diagram of section B;

[0034] Figure 4 For the present invention Figure 1 A magnified schematic diagram of part C in the middle section;

[0035] Figure 5 For the present invention Figure 1 A partially enlarged structural diagram of section D;

[0036] Figure 6 This is a schematic diagram of the overall structure of the filter disc of the present invention;

[0037] Figure 7 This is a schematic diagram of the overall structure of the partition seat of the present invention.

[0038] Reference numerals: 1. Vacuum cylinder; 2. Vacuum chamber; 3. Radiation source; 4. Filter plate; 5. Ring magnet I; 6. Sealed cylinder; 7. Observation cylinder I; 8. Observation lens; 9. Observation cylinder II; 10. Electron accelerator tube; 11. Sealed plate; 12. Front end cover; 13. Deflection plate; 14. Deflection groove; 15. Absorption plate; 16. Through hole I; 17. Exhaust pipe; 18. Vacuum machine; 19. Baffle seat; 20. Filter plate; 21. Enclosed disk; 22. Fixed magnetic lens; 23. Focusing electromagnetic coil one; 24. Accelerating coil; 25. Servo cylinder; 26. Gate; 27. Fluorescent coating; 28. Movable collar; 29. ​​Discharge groove; 30. Aperture; 31. Magnetic permeable groove; 32. Annular plug; 33. Coil cavity; 34. Focusing electromagnetic coil two; 35. Annular shell; 36. Fitting groove; 37. Glass tube; 38. Light reflector; 39. Glass column. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] like Figures 1-6 As shown, the present invention proposes a medical particle accelerator magnet vacuum device, including a vacuum cylinder 1, a vacuum chamber 2 is provided on the inner side of the vacuum cylinder 1, and a filter assembly, an electron accelerator tube 10, a sealing assembly and a movable focusing assembly are arranged sequentially on the inner side of the vacuum chamber 2, and a radiation source 3 is provided in the middle of one end of the inner side of the vacuum chamber 2.

[0041] The filtration assembly includes two filter discs 4, two annular magnets 5, and four absorption discs 15. Each of the two filter discs 4 has an absorption disc 15 on both sides. Each filter disc 4 has a circular groove in the middle. Each filter disc 4 has an annular magnet 5 in the middle of its inner side. Each absorption disc 15 has a through hole 16 in the middle.

[0042] An exhaust pipe 17 is provided on the outer side of one end of the vacuum chamber 2, and a vacuum machine 18 is provided on one side of the exhaust pipe 17. The exhaust pipe 17 is n-shaped, and the two ends of the exhaust pipe 17 are located on both sides of the filter assembly.

[0043] An observation mechanism is provided in the middle of the other side of the vacuum cylinder 1.

[0044] A front cover 12 is provided at one end of the inner side of the vacuum cylinder 1, and a channel is opened in the middle of the front cover 12;

[0045] The front cover 12 is used to cover one end of the vacuum chamber 2.

[0046] A deflection groove 14 is provided at one end of the vacuum cylinder 1, and a deflection plate 13 is hinged to the middle of the inner side of the deflection groove 14. A flat permanent magnet is provided on one side of the deflection plate 13.

[0047] The deflector plate 13 can be used to adjust the direction of the electron beam.

[0048] The sealing assembly includes a sealing disk 11, an absorption disk 15, a sealing disk 21, an accelerating coil 24, a discharge groove 29, and an aperture 30. The sealing disk 11 is disposed at one end of the inner side of the vacuum chamber 2. A sealing disk 21 is disposed at each end of the sealing disk 11. A through groove is opened in the middle of the sealing disk 21. An accelerating coil 24 is disposed around the circumference of the through groove. A discharge groove 29 is opened in the middle of the sealing disk 11. An aperture 30 is installed on one side of the inner side of the discharge groove 29. An absorption disk 15 is disposed on each side of one of the sealing disks 21. An absorption disk 15 is disposed on the side of the other sealing disk 21 near the sealing disk 11.

[0049] The sealing assembly keeps the inside of the vacuum chamber 2 under vacuum, thereby greatly reducing the obstruction and kinetic energy loss of the electron beam. The electron beam is emitted through the sealing assembly, and the magnetic field of the accelerating coil 24 accelerates the electrons to a certain extent. The absorption disk 15 can absorb discrete particles.

[0050] The accelerating coil 24 and the annular magnet 5 are both annular permanent magnets, and the materials of the enclosed disk 21, the absorption disk 15 and the filter disk 4 are all copper.

[0051] Copper can shield and block electromagnetic fields as well as absorb particles.

[0052] The observation mechanism includes a gate 26, a fluorescent coating 27, a sealing cylinder 6, an observation cylinder 7, a glass column 39, a light reflector 38, and an observation cylinder 9. A stepper motor is installed inside the vacuum cylinder 1, and the rotor of the stepper motor is connected to the gate 26. The gate 26 is located between the annular magnet 5 and the electron accelerator tube 10, in the middle of the inner side of the vacuum chamber 2. A fluorescent coating 27 is installed on one side of the gate 26. A sealing cylinder 6 is inserted into the middle of one side of the vacuum cylinder 1. An observation cylinder 7 is inserted into the inner side of the sealing cylinder 6. One end of the observation tube 7 is bent at 90 degrees. The shape of the observation tube 7 is L-shaped. An observation tube 9 is provided at the end of the observation tube 7 away from the vacuum tube 1. The central axis of the observation tube 9 is perpendicular to the central axis of one end of the observation tube 7. An observation lens 8 is provided on the inner side of one end of the observation tube 9. Two parallel light reflectors 38 are provided on the inner side of the end of the observation tube 7 away from the vacuum tube 1. The light reflectors 38 are at a 45-degree angle to the horizontal plane. A glass column 39 is provided on the inner side of the end of the light reflector 38 located in the vacuum cavity 2.

[0053] The rotation of the gate 26 causes the outer surface of the fluorescent coating 27 to form a 45-degree angle with the axis of the vacuum cylinder 1. Particles hit the surface of the fluorescent coating 27 and emit light. The observation mechanism can analyze the electron beam by observing the shape and brightness of the light spot on the fluorescent coating 27. The light emitted from the light spot on the fluorescent coating 27 enters the inner cavity of the observation cylinder 1 7, and then enters the inner side of the observation cylinder 2 9 after being reflected by two light reflectors 38, and finally reaches the observation lens 8 for observation.

[0054] The active focusing assembly includes a servo cylinder 25, a movable collar 28, a coil cavity 33, and a second focusing electromagnetic coil 34. A mating groove 36 is provided at one end of the inner side of the vacuum cavity 2. A glass tube 37 is inserted into the inner side of the vacuum cavity 2, with the outer side of the glass tube 37 located inside the mating groove 36. A movable collar 28 is fitted onto the outer side of the vacuum tube 1. A coil cavity 33 is located inside the movable collar 28, and a second focusing electromagnetic coil 34 is located inside the coil cavity 33. An annular shell 35 is installed on one side of the coil cavity 33. The servo cylinder 25 is fixedly connected to the outer side of one end of the vacuum tube 1. The movable end of the servo cylinder 25 is fixedly connected to one end of the movable collar 28. A magnetically permeable groove 31 is provided at one end of the inner side of the coil cavity 33. An annular plug 32 is inserted into the inner side of the magnetically permeable groove 31. The magnetically permeable groove 31 corresponds to the mating groove 36, and the relative positions of the magnetically permeable groove 31 and the mating groove 36 are variable.

[0055] Part of the magnetic field generated by the focusing electromagnetic coil 34 interferes with the electron beam in the vacuum cavity 2 through the magnetic permeable groove 31 and the mating groove 36, causing the electron beam to focus. By adjusting the relative position of the mating groove 36 and the magnetic permeable groove 31, the relative position of the magnetic field and the electron beam can be adjusted, thereby continuously adjusting the focusing position of the electron beam and thus adjusting the diameter of the electron beam.

[0056] A baffle seat 19 is provided at the connection between the exhaust pipe 17 and the vacuum chamber 2. A filter plate 20 is provided on one side of the baffle seat 19. The baffle seat 19 is a cuboid with a U-shaped groove on one side.

[0057] The bent structure of the baffle seat 19 can prevent particles from directly entering the inside of the exhaust pipe 17.

[0058] A fixed magnetic lens 22 is provided on the outer side of the vacuum cylinder 1, and a focusing electromagnetic coil 23 is provided on the inner side of the fixed magnetic lens 22. The fixed magnetic lens 22 corresponds to the sealing disk 11.

[0059] The focusing electromagnetic coil 23 can adjust the magnetic field as needed to increase the speed of electrons in the particle beam, allowing electrons to pass through the aperture 30 more effectively.

[0060] The specific implementation method is as follows: the vacuum machine 18 operates to continuously extract air from the vacuum chamber 2 through the exhaust pipe 17, so that the vacuum degree of the inner cavity of the vacuum chamber 2 reaches 5.3×10^(-4) Pa;

[0061] Radioactive source 3 undergoes fission and emits a large number of electrons. The electrons form an electron beam through the through hole 16. Particles that do not pass through the through hole 16 will hit the walls of the absorption disk 15 and the vacuum cavity 2 and then be absorbed.

[0062] The electron beam continues to pass through the filter disk 4 and the groove in the middle of the annular magnet 5. The filter disk 4 constrains the magnetic field generated by the annular magnet 5 into an accelerating magnetic field for the electron beam. Electrons whose velocity direction is too large at an angle to the axis of the vacuum cylinder 1 are deflected and struck to the outside of the absorption disk 15 and absorbed.

[0063] The filtering components remove electrons and other particles whose velocity direction is too far from the axis of the vacuum cylinder 1, making the electron beam more concentrated.

[0064] After passing through the filter assembly, the electron beam reaches the inside of the electron accelerator tube 10. The operation of the electron accelerator tube 10 stabilizes and accelerates the electrons in the particle beam. The electron beam continues to advance and passes through the sealing assembly. The sealing disk 21 constrains the magnetic field generated by the accelerating coil 24 into an accelerating magnetic field for the electron beam, thereby accelerating the electrons in the electron beam. The focusing electromagnetic coil 23 can adjust the magnetic field as needed to increase the speed of the electrons in the particle beam, allowing the electrons to pass through the aperture 30 more effectively.

[0065] Servo cylinder 25 controls movable collar 28 to move along the outside of vacuum cylinder 1, thereby focusing part of the magnetic field generated by electromagnetic coil 2 34 through magnetic groove 31 and mating groove 36 to deflect the rotation direction of electron beam in vacuum cavity 2, so that electron beam is focused. By adjusting the relative position of mating groove 36 and magnetic groove 31, the relative position of magnetic field and electron beam can be adjusted, thereby continuously adjusting the focusing position of electron beam, thereby adjusting the diameter of electron beam, and thus adjusting the size of wire bundle at the end of electron beam.

[0066] The electron beam continues to enter the inner side of the deflection groove 14. The magnetic field generated by the deflection plate 13 causes the electron beam to deflect, thereby changing the deflection angle of the electron beam and thus changing the direction and position of the electron beam hitting the outside of the vacuum cavity 2.

[0067] The stepper motor controls the rotation of the gate 26, causing the outer side of the fluorescent coating 27 to form a 45-degree angle with the axis of the vacuum cylinder 1. Particles hit the surface of the fluorescent coating 27 and emit light. The observation mechanism can analyze the electron beam by observing the shape and brightness of the light spot on the fluorescent coating 27. The light emitted from the light spot on the fluorescent coating 27 enters the inner cavity of the first observation cylinder 7, and then enters the inner side of the second observation cylinder 9 after being reflected by two light reflectors 38, and finally reaches the observation lens 8 for observation.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A medical particle accelerator magnet vacuum device, comprising a vacuum cylinder (1), characterized in that, The vacuum cylinder (1) has a vacuum chamber (2) inside. A filtration assembly, an electron accelerator tube (10), a sealing assembly, and a movable focusing assembly are sequentially arranged inside the vacuum chamber (2). A radiation source (3) is located in the middle of one end of the vacuum chamber (2). The filtration assembly includes two filter disks (4), two annular magnets (5), and four absorption disks (15). Each of the two filter disks (4) has an absorption disk (15) on both sides. A circular groove is formed in the middle of each filter disk (4). An annular magnet (5) is located in the middle of the inner side of each filter disk (4). A through hole (16) is formed in the middle of each absorption disk (15). The vacuum chamber (2) has a... An exhaust pipe (17) is provided on the outside, and a vacuum machine (18) is provided on one side of the exhaust pipe (17). The exhaust pipe (17) is n-shaped, and the two ends of the exhaust pipe (17) are located on both sides of the filter assembly. An observation mechanism is provided in the middle of the other side of the vacuum cylinder (1). The sealing assembly includes a sealing plate (11), an absorption plate (15), a sealing plate (21), an acceleration coil (24), a discharge groove (29), and an aperture (30). The sealing plate (11) is located at one end of the inner side of the vacuum chamber (2). A sealing plate (21) is provided at each end of the sealing plate (11). A through groove is opened in the middle of the sealing plate (21), and an acceleration coil is provided at the circumference of the through groove. 24), a discharge groove (29) is provided in the middle of the sealing disk (11), and an aperture (30) is installed on one side of the inner side of the discharge groove (29). An absorption disk (15) is provided on both sides of one of the sealing disks (21), and an absorption disk (15) is provided on the side of the other sealing disk (21) near the sealing disk (11). The movable focusing assembly includes a servo electric cylinder (25), a movable collar (28), a coil cavity (33), and a second focusing electromagnetic coil (34). A mating groove (36) is provided at one end of the inner side of the vacuum cavity (2). A glass tube (37) is inserted into the inner side of the vacuum cavity (2). The outer side of the glass tube (37) is located inside the mating groove (36). (1) is fitted with a movable collar (28) on the outside. A coil cavity (33) is provided on the inside of the movable collar (28). A focusing electromagnetic coil (34) is provided on the inside of the coil cavity (33). An annular shell (35) is installed on one side of the coil cavity (33). A servo cylinder (25) is fixedly connected to the outside of one end of the vacuum cylinder (1). The movable end of the servo cylinder (25) is fixedly connected to one end of the movable collar (28). A magnetic groove (31) is opened on one end of the inner side of the coil cavity (33). An annular plug (32) is inserted into the inner side of the magnetic groove (31). The magnetic groove (31) corresponds to the mating groove (36). The relative position of the magnetic groove (31) and the mating groove (36) can be changed.

2. The medical particle accelerator magnet vacuum device according to claim 1, characterized in that: The vacuum cylinder (1) has a front end cover (12) at one end of its inner side, and a channel is provided in the middle of the front end cover (12).

3. The medical particle accelerator magnet vacuum device according to claim 1, characterized in that: One end of the vacuum cylinder (1) is provided with a deflection groove (14), and a deflection plate (13) is hinged to the middle of the inner side of the deflection groove (14). A flat permanent magnet is provided on one side of the deflection plate (13).

4. The medical particle accelerator magnet vacuum device according to claim 1, characterized in that: The accelerating coil (24) and the annular magnet (5) are both annular permanent magnets, and the closed disk (21), the absorption disk (15) and the filter disk (4) are all made of copper.

5. A medical particle accelerator magnet vacuum device according to claim 1, characterized in that: The observation mechanism includes a gate (26), a fluorescent coating (27), a sealing cylinder (6), an observation cylinder one (7), a glass column (39), a light reflector (38), and an observation cylinder two (9). A stepper motor is installed inside the vacuum cylinder (1), and the rotor of the stepper motor is connected to the gate (26). The gate (26) is located between the annular magnet one (5) and the electron accelerator tube (10), in the middle of the inner side of the vacuum cavity (2). A fluorescent coating (27) is installed on one side of the gate (26). A sealing cylinder (6) is inserted into the middle of one side of the vacuum cylinder (1). An observation cylinder one (7) is inserted into the inner side of the sealing cylinder (6). One end of the observation tube (7) is bent at 90 degrees. The shape of the observation tube (7) is L-shaped. The end of the observation tube (7) away from the vacuum tube (1) is provided with the observation tube (9). The central axis of the observation tube (9) is perpendicular to the central axis of one end of the observation tube (7). An observation lens (8) is provided on the inner side of one end of the observation tube (9). Two parallel light reflectors (38) are provided on the inner side of the end of the observation tube (7) away from the vacuum tube (1). The light reflectors (38) are at a 45-degree angle to the horizontal plane. A glass column (39) is provided on the inner side of the end of the light reflector (38) located in the vacuum cavity (2).

6. A medical particle accelerator magnet vacuum device according to claim 1, characterized in that: A baffle seat (19) is provided at the connection between the exhaust pipe (17) and the vacuum chamber (2), and a filter plate (20) is provided on one side of the baffle seat (19).

7. A medical particle accelerator magnet vacuum device according to claim 1, characterized in that: A fixed magnetic lens (22) is provided on the outside of the vacuum cylinder (1), and a focusing electromagnetic coil (23) is provided on the inside of the fixed magnetic lens (22). The fixed magnetic lens (22) corresponds to the sealing disk (11).

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