Method of installing an electron linac solenoid

Abstract

The application provides a method for installing solenoid of an electron linear accelerator, which comprises the following steps: setting a front stand; setting a middle stand for installing at least one component of the front part in the rear section and a solenoid focusing assembly, wherein the solenoid focusing assembly is slidably arranged on the middle stand; setting a rear stand for installing an accelerating tube assembly; when replacing the solenoid, removing all the components of the front part on the middle stand and the support seat thereon, moving the solenoid focusing assembly towards the front stand to make the solenoid out of the accelerating tube; assembling a new solenoid into the solenoid focusing assembly and moving the solenoid focusing assembly towards the rear stand to make the solenoid into the accelerating tube; then, assembling the support seat on the middle stand; and installing the removed components on the middle stand and performing system collimation.

Description

Technical Field

[0001] This application relates to the field of electron linear accelerator technology, and in particular to a method for installing an electron linear accelerator solenoid. Background Technology

[0002] The solenoid is located in the initial stage of the electron linear accelerator. After the electron gun emits the electron beam, the quality of the beam does not meet the requirements for later use. Therefore, the beam needs to be focused, measured, monitored, and shaped to meet the requirements. The main components of the solenoid include the photocathode electron gun, the pre-focusing assembly, the photocathode feeding assembly, the beam extraction testing assembly, the beam intensity testing assembly, and the beam position testing assembly. Among these, the solenoid is the main device for shaping and focusing the electron beam. Located between the pre-focusing components and the accelerator tube, it mainly uses an electromagnetic field to laterally focus the electron beam into a spherical shape, suppressing beam divergence and emission increase caused by the space charge effect. The higher the electron density, the better. Therefore, in the design of the solenoid, the closer the radial distance between the solenoid and the accelerator tube, the better. The electromagnetic field of the solenoid is continuous and surrounds a section of the accelerator tube, thus enabling better shaping and focusing of the electron beam in the accelerator tube.

[0003] However, in current electron linear accelerator designs, the pre-amplifier components are typically mounted on a gantry, such as... Figure 1 As shown, this design facilitates the focusing and refining of the electron beam, while the accelerating tube and solenoid are mounted on a separate platform. However, the accelerating tube assembly weighs over 500 kg, and the solenoid assembly weighs over 300 kg. To address the replacement and assembly issues, some accelerator designers have adopted a method of splitting a large solenoid into multiple smaller solenoids, thereby achieving the required beam quality through multiple beam refining and refining processes. However, this method has the drawback of requiring monitoring after each beam refining and refining process to determine the refining and refining parameters for the next process. This increases the complexity of the structure and the system cost.

[0004] Some accelerator designers use an integrated solenoid design. The replacement and assembly method involves disassembling the rear section of the accelerator tube, fixing the solenoid, and fitting the accelerator tube structure into the solenoid. In this method, the solenoid is a whole unit, and the focusing and assembling of the accelerator tube is continuous. However, the installation process is difficult to control. On the one hand, the rear section of the accelerator tube has many connecting devices, and the entire line needs to be broken during disassembly and assembly, resulting in low disassembly and assembly efficiency. On the other hand, the head of the accelerator tube is prone to hitting the inside of the solenoid, thereby causing damage to the solenoid or the accelerator tube. Summary of the Invention

[0005] To address the issues of low efficiency and susceptibility to damage during the assembly and disassembly of solenoids on accelerator tubes in existing linear accelerator designs, this application provides a solenoid installation method for electronic linear accelerators.

[0006] The solenoid installation method for an electron linear accelerator provided in this application adopts the following technical solution:

[0007] A method for installing a solenoid in an electron linear accelerator includes the following steps:

[0008] A front-mounted platform is provided for mounting multiple components located at the front of the front-mounted components;

[0009] A central platform is provided for mounting at least one component located at the rear of the front component and a solenoid bundle assembly, the solenoid bundle assembly being slidably mounted on the central platform;

[0010] A rear platform is provided for installing the accelerator tube assembly, and the end of the first accelerator tube of the accelerator tube assembly extends to the middle platform. Both the middle platform and the rear platform are provided with support seats for supporting the accelerator tube.

[0011] When replacing the solenoid, remove all components belonging to the front-end components on the central platform and the support seat thereon, and move the solenoid bundle assembly toward the front-end platform so that the solenoid comes out of the acceleration tube.

[0012] The new solenoid is assembled into the solenoid bundle assembly, and the solenoid bundle assembly is moved toward the rear section of the platform so that the solenoid is fitted onto the accelerator tube; then the support seat on the middle platform is installed.

[0013] Install the components removed from the central platform and perform system alignment.

[0014] Furthermore, the solenoid bundle assembly includes, from top to bottom, a solenoid, a horizontal adjustment plate, a base plate, a horizontal adjustment component, a vertical adjustment support component, and a bottom sliding plate.

[0015] Furthermore, slide rails are provided on both sides of the central platform along its length, and sliders that are adapted to slide on the bottom slide plate are installed.

[0016] Furthermore, when installing the solenoid, first assemble the horizontal adjustment plate, the base plate, the horizontal adjustment assembly, the vertical adjustment support assembly, and the bottom slide plate on the central platform, and then move them to a set position and fix them.

[0017] Next, connect the first section of the acceleration tube in the acceleration tube assembly to the beam position test assembly in the front component, straighten the beam, record the straightening position, remove the support seat on the middle platform, remove the components on the middle platform, move the bottom slide to the empty position, hoist the solenoid onto the horizontal platform adjustment plate for installation and fixation, and align it to the set point.

[0018] Then proceed with the next steps.

[0019] Furthermore, the bottom slide plate is fixed with multiple vertically arranged and intersecting reinforcing ribs.

[0020] Furthermore, the bottom slide plate is threaded with several positioning bolts for abutting against the upper end face of the central platform.

[0021] Furthermore, the horizontal adjustment components are provided in multiple quantities and distributed on at least three sides of the horizontal adjustment plate, and horizontal adjustment components are provided at both ends of one side of the horizontal adjustment plate.

[0022] The horizontal adjustment components include:

[0023] The adjusting block is fixed to the side of the horizontal adjusting plate;

[0024] An adjustment plate is fixed to the side of the base plate and corresponds to the adjustment block, and has an oval hole on it;

[0025] The first adjusting bolt is fixed to the adjusting block and passes through the oblong hole; and

[0026] The first adjusting nut is threaded onto the end of the first adjusting bolt furthest from the adjusting block.

[0027] Furthermore, it also includes:

[0028] The second adjusting bolt is threaded through the adjusting plate and abuts against the side of the horizontal adjusting plate.

[0029] Furthermore, both the first adjusting bolt and the second adjusting bolt are threaded with anti-loosening nuts.

[0030] Furthermore, a support plate is fixedly connected to the lower part of one end of the central platform near the front platform, and a lifting bracket is fixedly connected to the support plate. All components of the front component distributed on the central platform are installed on the upper surface of the lifting bracket.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. By setting up a middle platform between the front platform and the rear platform, and installing the beam intensity test component and beam position test component of the front component on the middle platform, the installation and replacement of the solenoid can be achieved simply by removing the beam intensity test component, beam position test component and a support base on the middle platform and then sliding the solenoid bundle assembly to the set position. This makes the operation more convenient and efficient.

[0033] 2. The installation method of this application can be performed under full vacuum without breaking the vacuum completely and removing several acceleration tubes. Only the relevant components on the central platform need to be removed to remove the solenoid clustering assembly. Only one acceleration tube needs to be broken to break the vacuum, which greatly improves the efficiency of installation and replacement. Furthermore, this installation method requires fewer parts to be disassembled on the linear accelerator, which greatly reduces the difficulty of subsequent collimation operations and makes its application advantages more obvious. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the existing front-end component arrangement in the background art of this application;

[0036] Figure 2 This is a partial layout diagram of the linear accelerator in an embodiment of this application;

[0037] Figure 3 This is a structural schematic diagram of the central platform and its components in an embodiment of this application;

[0038] Figure 4 This is a side view of the central platform and its components according to an embodiment of this application;

[0039] Figure 5 yes Figure 3 An enlarged schematic diagram of part A in the middle.

[0040] Figure label:

[0041] 1. Pre-projector; 11. Photocathode electron gun; 12. Pre-focusing assembly; 13. Photocathode feed assembly; 14. Beam extraction test assembly; 15. Beam intensity test assembly; 16. Beam position test assembly;

[0042] 2. Front-mounted platform;

[0043] 3. Central platform; 31. Slide rail; 32. Support plate; 33. Lifting bracket;

[0044] 4. Rear platform;

[0045] 5. Solenoid clustering assembly; 51. Solenoid; 52. Horizontal adjustment plate; 53. Base plate; 54. Horizontal adjustment assembly; 55. Vertical adjustment support assembly; 56. Bottom sliding plate; 57. Slider; 58. Reinforcing rib; 59. Positioning bolt;

[0046] 6. Accelerator tube assembly; 61. Accelerator tube; 62. Support base;

[0047] 71. Adjusting block; 72. Adjusting plate; 721. Oval hole; 73. First adjusting bolt; 74. First adjusting nut; 75. Second adjusting bolt; 76. Anti-loosening nut. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] Reference Figure 2 , Figure 3 and Figure 4 This application discloses a method for installing a solenoid in an electron linear accelerator, which includes the following steps:

[0050] A front-end platform 2 is set up to install multiple components located at the front end of the front-end component 1. The front-end component 1 is arranged in the following order from front to back: photocathode electron gun 11, front beam focusing component 12, photocathode feeding component 13, beam extraction test component 14, beam intensity test component 15, and beam position test component 16, for a total of six components.

[0051] A central platform 3 is provided for mounting at least one component located at the rear section of the front component 1 and a solenoid focusing assembly 5. The solenoid focusing assembly 5 is slidably mounted on the central platform 3. In specific configuration, the number of components located in the front component 1 mounted on the central platform 3 depends on the size of the solenoid focusing assembly 5. In this embodiment, two components located at the rear section of the front component 1 are selected to be mounted on the central platform 3, that is, the beam intensity testing component 15 and the beam position testing component 16 are mounted on the central platform 3, and the other four components are mounted uniformly on the front platform 2.

[0052] A rear stage 4 is provided for installing the acceleration tube 61 assembly 6, and the end of the first acceleration tube 61 of the front section of the acceleration tube 61 assembly 6 extends to the middle stage 3. Both the middle stage 3 and the rear stage 4 are provided with support seats 62 for supporting the acceleration tube 61.

[0053] When replacing the solenoid 51, remove all components belonging to the front component 1 on the central platform 3 and the support base 62 thereon, specifically the beam intensity test component 15 and the beam position test component 16. Then move the solenoid beam-gathering component 5 toward the front platform 2 so that the solenoid 51 is removed from the acceleration tube 61.

[0054] The new solenoid 51 is assembled into the solenoid bundle assembly 5, and the solenoid bundle assembly 5 is pushed towards the rear stage 4 so that the solenoid 51 is fitted onto the acceleration tube 61; then the support seat 62 on the middle stage 3 is installed.

[0055] Install the beam intensity test assembly 15 and beam position test assembly 16 removed from the central test stand 3 and perform system alignment.

[0056] The solenoid 51 bundle assembly includes, from top to bottom, a solenoid 51, a horizontal adjustment plate 52, a base plate 53, a horizontal adjustment component 54, a vertical adjustment support component 55, and a bottom slide plate 56; the vertical adjustment support component 55 is a conventional method in the art and will not be described in detail here. Slide rails 31 are provided on both sides of the central platform 3 along its length. Sliding sliders 57, which are adapted to slide on the slide rails 31, are installed on the bottom slide plate 56. The sliding sliders 57 are distributed at least at the four corners of the bottom slide plate 56, that is, at least four sliding sliders 57 are provided to slide and connect with the two slide rails 31.

[0057] Furthermore, if the solenoid 51 is installed for the first time, the horizontal adjustment plate 52, the base plate 53, the horizontal adjustment component 54, the vertical adjustment support component 55 and the bottom slide plate 56 are first assembled on the central platform 3 and moved to the set position and fixed.

[0058] Next, connect the first section of the accelerating tube 61 in the accelerating tube 61 assembly 6 to the beam position test assembly 16 in the front component 1, straighten the beam, record the straightening position, remove the support seat 62 on the middle platform 3, and remove the beam intensity test assembly 15 and beam position test assembly 16 on the middle platform 3. Move the bottom slide plate 56 to the empty position on the middle platform 3, hoist the solenoid 51 onto the horizontal adjustment plate 52 for installation and fixation, and align it to the set point.

[0059] Then proceed with the next steps.

[0060] Therefore, by setting a middle platform 3 between the front platform 2 and the rear platform 4, and installing the beam intensity testing component 15 and beam position testing component 16 of the front component 1 on the middle platform 3, the installation and replacement of the solenoid 51 can be achieved simply by removing the beam intensity testing component 15, the beam position testing component 16, and a support base 62 from the middle platform 3, and then sliding the solenoid clustering component 5 to the set position. Under full-line vacuum conditions, this avoids the need to completely break the vacuum and remove several acceleration tubes 61. Only the relevant components on the middle platform 3 need to be removed to remove the solenoid clustering component 5, which only requires breaking the vacuum of one acceleration tube 61, greatly improving installation and replacement efficiency. Furthermore, this installation method requires fewer components to be disassembled on the linear accelerator, significantly reducing the difficulty of subsequent collimation operations, making its application advantages even more obvious.

[0061] In addition, refer to Figure 3 and Figure 4 Multiple vertically arranged and intersecting reinforcing ribs 58 are fixed on the bottom slide plate 56 to improve the overall support strength of the bottom slide plate 56 and ensure the horizontality of the solenoid 51 installed on it; and several positioning bolts 59 are threaded through the bottom slide plate 56 to abut against the upper end face of the middle platform 3, so that the solenoid bundle assembly 5 can be directly positioned and fixed after sliding into place, which can reduce the amount of axial alignment work.

[0062] The aforementioned horizontal adjustment components 54 are provided in multiples and distributed on at least three sides of the horizontal adjustment plate 52, and horizontal adjustment components 54 are provided at both ends of one side of the horizontal adjustment plate 52.

[0063] Reference Figure 3 and Figure 5 The horizontal adjustment component 54 includes:

[0064] Adjusting block 71 is fixedly connected to the side of horizontal adjusting plate 72;

[0065] An adjusting plate 72 is fixed to the side of the base plate 53 and corresponds to the adjusting block 71, and an oblong hole 721 is provided on it.

[0066] The first adjusting bolt 73 is fixed to the adjusting block 71 and passes through the oblong hole 721;

[0067] The first adjusting nut 74 is threadedly connected to the end of the first adjusting bolt 73 away from the adjusting block 71;

[0068] The second adjusting bolt 75 is threaded through the adjusting plate 72 and abuts against the side of the horizontal adjusting plate 72. Both the first adjusting bolt 73 and the second adjusting bolt 75 are threaded with anti-loosening nuts 76.

[0069] Therefore, by using the multiple horizontal adjustment components 54 provided between the horizontal adjustment plate 52 and the base plate 53, the adjustment efficiency and accuracy of the horizontal position of the horizontal adjustment plate 52 on the base plate 53 can be greatly improved by rotating the first adjusting bolt 73 and the second adjusting bolt 75 to the appropriate position. After the adjustment is completed, the first adjusting bolt 73 and the second adjusting bolt 75 can be locked by loosening the nut to further ensure the horizontal position stability of the newly installed solenoid 51.

[0070] Additionally, refer to Figure 3 and Figure 4 A support plate 32 is fixedly connected to the lower part of the middle platform 3 near the front platform 2. A lifting bracket 33 is fixedly connected to the support plate 32. All components of the front component 1 distributed on the middle platform 3 are installed on the upper surface of the lifting bracket 33. In a specific setting, a positioning groove can be provided on the support plate 32, and a positioning block that matches the positioning groove can be provided on the lifting bracket 33. This allows for quick positioning and reassembly after the lifting bracket 33 and the beam intensity testing component 15 and beam position testing component 16 on it are removed. It only needs to be aligned in the axial direction and can be directly positioned in the direction perpendicular to the axial direction.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing a solenoid in an electron linear accelerator, characterized in that, Includes the following steps: A front-mounted platform is provided for mounting multiple components located at the front of the front-mounted components; A central platform is provided for mounting at least one component located at the rear of the front component and a solenoid bundle assembly, the solenoid bundle assembly being slidably mounted on the central platform; A rear platform is provided for installing the accelerator tube assembly, and the end of the first accelerator tube of the accelerator tube assembly extends to the middle platform. Both the middle platform and the rear platform are provided with support seats for supporting the accelerator tube. When replacing the solenoid, remove all components belonging to the front-end components on the central platform and the support seat thereon, and move the solenoid bundle assembly toward the front-end platform so that the solenoid comes out of the acceleration tube. The new solenoid is assembled into the solenoid bundle assembly, and the solenoid bundle assembly is moved toward the rear section of the platform so that the solenoid is fitted onto the accelerator tube; then the support seat on the middle platform is installed. Install the components removed from the central support frame and perform system alignment; The solenoid bundle assembly includes, from top to bottom, a solenoid, a horizontal adjustment plate, a base plate, a horizontal adjustment component, a vertical adjustment support component, and a bottom slide plate; both sides of the central platform along its length are provided with slide rails, and the bottom slide plate is equipped with sliders that are adapted to slide along the slide rails; When installing the solenoid, first assemble the horizontal adjustment plate, the base plate, the horizontal adjustment assembly, the vertical adjustment support assembly, and the bottom slide plate on the central platform, and then move them to the set position and fix them. Next, connect the first section of the acceleration tube in the acceleration tube assembly to the beam position test assembly in the front component, straighten the beam, record the straightening position, remove the support seat on the middle platform, remove the components on the middle platform, move the bottom slide to the empty position, hoist the solenoid onto the horizontal platform adjustment plate for installation and fixation, and align it to the set point. Then proceed with the next steps.

2. The method for installing an electron linear accelerator solenoid according to claim 1, characterized in that, The bottom slide plate is fixed with multiple vertically arranged and intersecting reinforcing ribs.

3. The method for installing an electron linear accelerator solenoid according to claim 1, characterized in that, The bottom slide plate is threaded with several positioning bolts for abutting against the upper end face of the middle platform.

4. The method for installing an electron linear accelerator solenoid according to claim 1, characterized in that, The horizontal adjustment components are provided in multiple ways and distributed on at least three sides of the horizontal adjustment plate, and horizontal adjustment components are provided at both ends of one side of the horizontal adjustment plate. The horizontal adjustment components include: The adjusting block is fixed to the side of the horizontal adjusting plate; An adjustment plate is fixed to the side of the base plate and corresponds to the adjustment block, and has an oval hole on it; The first adjusting bolt is fixed to the adjusting block and passes through the oblong hole; and The first adjusting nut is threaded onto the end of the first adjusting bolt furthest from the adjusting block.

5. The method for installing an electron linear accelerator solenoid according to claim 4, characterized in that, Also includes: The second adjusting bolt is threaded through the adjusting plate and abuts against the side of the horizontal adjusting plate.

6. The method for installing an electron linear accelerator solenoid according to claim 5, characterized in that, Both the first adjusting bolt and the second adjusting bolt are threaded with anti-loosening nuts.

7. The method for installing an electron linear accelerator solenoid according to claim 1, characterized in that, A support plate is fixedly connected to the lower part of the middle platform near the front platform, and a lifting bracket is fixedly connected to the support plate. All components of the front component distributed on the middle platform are installed on the upper surface of the lifting bracket.

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