Method for installing solenoid of electron linear accelerator

Abstract

The invention provides a solenoid installation method of an electron linear accelerator. The solenoid installation method comprises the following steps that a front rack is arranged; a middle rack is arranged and used for installing at least one assembly located on the rear section of the front part and a solenoid bunching assembly, and the solenoid bunching assembly is arranged on the middle rack in a sliding mode; a rear section rack is arranged and used for installing an accelerating tube assembly; when the solenoids are replaced, all assemblies belonging to the front-arranged component on the middle rack and supporting seats on the assemblies are disassembled, and the solenoid bunching assemblies are moved in the direction close to the front-arranged rack, so that the solenoids are separated out of the accelerating tube; a new solenoid is assembled into the solenoid bunching assembly, and the solenoid bunching assembly is pushed to move in the direction close to the rear section rack, so that the accelerating tube is sleeved with the solenoid; a supporting seat on the middle rack is mounted; and the components dismounted from the middle rack are mounted, and system collimation is carried out. When the solenoid is installed and replaced, the number of detached parts is small, and the assembling efficiency is higher.

Description

Technical Field

[0001] This application relates to the technical field of electron linear accelerators, and particularly to a method for installing a solenoid of an electron linear accelerator. Background Art

[0002] The solenoid is located at the initial section of the electron linear accelerator. After the electron gun emits electron bunches, the quality of the bunches does not meet the requirements for later use. Therefore, it is necessary to focus, measure, monitor, and sort the bunches to meet the requirements. Its front-end components mainly include a photocathode electron gun, a pre-bunching component, a photocathode feeding component, a beam extraction and testing component, a beam intensity testing component, and a beam position testing component. Among them, the solenoid is the main device for sorting and focusing the electron bunches, and is located between the front-end components and the accelerating tube. It mainly sorts the electron bunches through electromagnetic fields and focuses them horizontally into a spherical shape, suppressing the beam divergence and emittance growth caused by the space charge effect, and the greater the electron density, the better. Therefore, during the design of the solenoid, the radial distance between the solenoid and the accelerating tube should be as close as possible, and the electromagnetic field of the solenoid is continuous and wraps a section of the accelerating tube, so as to better complete the sorting and focusing of the bunches in the accelerating tube.

[0003] However, in the current design of electron linear accelerators, generally, the front-end components are arranged on a bench, as Figure 1 shown, which is convenient for sorting and focusing the electron bunches, while the accelerating tube and the solenoid are arranged on another bench. However, the components of the accelerating tube part exceed 500 kg, and the solenoid components also exceed 300 kg. To solve the problem of replacement and assembly, some accelerator designers split a large solenoid into multiple small solenoids, so that the quality of the bunches can meet the requirements through multiple sorting and focusing of the bunches; but the problem with this method is that the bunches need to be monitored every time they are sorted and focused, so as to give the sorting and focusing parameters for the next time, which will make the structure more complex and increase the cost of the system.

[0004] Some accelerator designers also adopt an overall solenoid design. The method for replacement and assembly is to disassemble the rear section of the accelerating tube, then fix the solenoid, and then insert the accelerating tube structure into the solenoid. In this way, the solenoid is an integral whole, and the bunch sorting and focusing is continuous, but the installation process is difficult to control. On the one hand, there are many connecting devices in the rear section of the accelerating tube, and the whole line needs to be evacuated when disassembling and assembling, resulting in low disassembly and assembly efficiency; on the other hand, the head of the accelerating tube is likely to touch the inside of the solenoid, causing damage to the solenoid or the accelerating tube. Summary of the Invention

[0005] In order to improve the problem of low disassembly and assembly efficiency and easy collision and damage of the solenoid on the accelerating tube in the existing linear accelerator design, this application provides a method for installing a solenoid of an electron linear accelerator.

[0006] A method for installing a solenoid of an electron linear accelerator provided by this application adopts the following technical solution: A method for installing a solenoid of an electron linear accelerator includes the following steps: Set up a front bench for installing multiple components in the front section of the front components; Set up a middle bench for installing at least one component in the rear section of the front components and a solenoid bunching component, and the solenoid bunching component is slidably arranged on the middle bench; Set up a rear bench for installing an accelerating tube component, and the end of the first accelerating tube at the front section of the accelerating tube component extends to the middle bench. Support seats for supporting the accelerating tube are arranged on both the middle bench and the rear bench; When replacing the solenoid, remove all components belonging to the front components on the middle bench and the support seats thereon, and move the solenoid bunching component towards the direction close to the front bench so that the solenoid comes out of the accelerating tube; Assemble a new solenoid into the solenoid bunching component, and push the solenoid bunching component towards the direction close to the rear bench so that the solenoid is sleeved on the accelerating tube; then install the support seats on the middle bench; Install the components removed from the middle bench and perform system alignment.

[0007] Furthermore, the solenoid bunching component includes a solenoid, a horizontal adjustment plate, a bottom plate, a horizontal adjustment component, a vertical adjustment support component, and a bottom slide plate arranged in sequence from top to bottom.

[0008] Furthermore, slide rails are arranged on both sides in the length direction of the middle bench, and sliders slidably adapted to the slide rails are installed on the bottom slide plate.

[0009] Furthermore, when installing the solenoid, first assemble the horizontal adjustment plate, the bottom plate, the horizontal adjustment component, the vertical adjustment support component, and the bottom slide plate on the middle bench and move them to a set position for fixation; Then connect the first accelerating tube in the accelerating tube component to the beam position test component in the front components, collimate the beam line, record the collimation position, then remove the support seats on the middle bench, remove the components on the middle bench, move the bottom slide plate to the vacated position, hoist the solenoid onto the horizontal platform adjustment plate for installation and fixation, and collimate it to a set point; Then perform subsequent steps.

[0010] Furthermore, a plurality of vertically arranged and longitudinally and horizontally intersecting reinforcing ribs are fixedly connected to the bottom slide plate.

[0011] Furthermore, a number of positioning bolts are threaded through the bottom sliding plate for abutting against the upper end surface of the middle bench.

[0012] Furthermore, a plurality of the horizontal adjustment components are provided and distributed on at least three sides of the horizontal adjustment plate, and the horizontal adjustment components are arranged at both ends of one side of the horizontal adjustment plate; The horizontal adjustment component includes: An adjustment block, fixedly connected to the side of the horizontal adjustment plate; An adjustment plate, fixedly connected to the side of the bottom plate and corresponding to the adjustment block, and a waist-shaped hole is formed therein; A first adjustment bolt, fixedly connected to the adjustment block and passing through the waist-shaped hole; and A first adjustment nut, threadedly connected to one end of the first adjustment bolt away from the adjustment block.

[0013] Furthermore, it further includes: A second adjustment bolt, threadedly penetrating through the adjustment plate and abutting against the side of the horizontal adjustment plate.

[0014] Furthermore, lock nuts are threadedly connected to both the first adjustment bolt and the second adjustment bolt.

[0015] Furthermore, a supporting plate is fixedly connected to the lower part of one end of the middle bench close to the front bench, and a lifting bracket is fixedly connected to the supporting plate, and all components in the front components distributed on the middle bench are installed on the upper end surface of the lifting bracket.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. By arranging a middle bench between the front bench and the rear bench, and installing the beam intensity test component and the beam position test component of the front components on the middle bench, when the solenoid is first installed and repaired and replaced after operation, only the beam intensity test component, the beam position test component and a support seat on the middle bench need to be removed, and then the solenoid bunching component is slid to the set position, so as to realize the installation and replacement of the solenoid, and the operation is more convenient and the efficiency is higher; 2. The installation method of the present application can be in the state of whole-line vacuum, without completely breaking the vacuum. Then, several accelerating tubes are removed. Only the relevant components on the middle bench need to be removed, and the solenoid bunching component can be taken out. Only one accelerating tube needs to be broken vacuum here, which greatly improves the installation and replacement efficiency; and this installation method requires fewer components to be disassembled on the linear accelerator, greatly reducing the subsequent collimation operation difficulty, and the application advantage is more obvious. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic diagram of the existing front component layout in the background art of the present application; Figure 2 is a schematic diagram of the partial layout structure of the linear accelerator in the embodiment of the present application; Figure 3 is a schematic diagram of the middle gantry and its upper components in the embodiment of the present application; Figure 4 is a side view of the middle gantry and its upper components in the embodiment of the present application; Figure 5 is Figure 3 an enlarged schematic diagram of part A in

[0019] Reference numerals: 1. Front component; 11. Photo-cathode electron gun; 12. Front bunching component; 13. Photo-cathode feeding component; 14. Beam extraction and testing component; 15. Beam intensity testing component; 16. Beam position testing component; 2. Front gantry; 3. Middle gantry; 31. Slide rail; 32. Support plate; 33. Lifting bracket; 4. Rear gantry; 5. Solenoid bunching component; 51. Solenoid; 52. Horizontal adjustment plate; 53. Base plate; 54. Horizontal adjustment component; 55. Vertical adjustment support component; 56. Bottom slide plate; 57. Slide block; 58. Reinforcing rib; 59. Positioning bolt; 6. Accelerating tube component; 61. Accelerating tube; 62. Support seat; 71. Adjusting block; 72. Adjusting plate; 721. Oval hole; 73. First adjusting bolt; 74. First adjusting nut; 75. Second adjusting bolt; 76. Locknut. Detailed embodiments

[0020] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] Refer toFigure 2 , Figure 3 and Figure 4 The present application embodiment discloses a method for installing a solenoid of an electron linear accelerator, which comprises the following steps: A front stand 2 is provided for installing a plurality of components located at the front section of the front component 1, wherein the front component 1 is arranged from front to back in the order of a photocathode electron gun 11, a front bunching component 12, a photocathode feeding component 13, a beam extraction test component 14, a beam intensity test component 15 and a beam position test component 16, a total of six components.

[0022] A middle stand 3 is provided for installing at least one component located in the rear section of the front component 1 and a solenoid bunching component 5. The solenoid bunching component 5 can be slidably arranged on the middle stand 3. In the specific arrangement, the number of components installed in the front component 1 on the middle stand 3 depends on the size of the solenoid bunching component 5. In the present embodiment, two components in the rear section of the front component 1 are selected to be installed on the middle stand 3, that is, the beam intensity test component 15 and the beam position test component 16 are installed on the middle stand 3, and the other four components are uniformly installed on the front stand 2.

[0023] A rear stage 4 is provided for installing the accelerating tube 61 assembly 6, and the end of the first accelerating tube 61 of the front stage of the accelerating tube 61 assembly 6 extends to the middle stage 3, and a support seat 62 for supporting the accelerating tube 61 is provided on both the middle stage 3 and the rear stage 4.

[0024] When replacing the solenoid 51 , all components belonging to the front part 1 on the middle stage 3 and the support base 62 thereon are removed, specifically the beam intensity test component 15 and the beam position test component 16 , and then the solenoid focusing component 5 is moved toward the front stage 2 to allow the solenoid 51 to escape from the accelerating tube 61 .

[0025] Assemble the new solenoid 51 into the solenoid bunching assembly 5, and push the solenoid bunching assembly 5 toward the direction close to the rear stage 4, so that the solenoid 51 is sleeved onto the accelerating tube 61; and then install the support seat 62 on the middle stage 3.

[0026] The beam intensity test assembly 15 and the beam position test assembly 16 removed from the middle stand 3 are installed and the system is aligned.

[0027] Among them, the solenoid 51 clustering assembly includes a solenoid 51, a horizontal adjustment plate 52, a bottom plate 53, a horizontal adjustment assembly 54, a vertical adjustment support assembly 55, and a bottom slide plate 56 arranged in sequence from top to bottom; the vertical adjustment support assembly 55 is a conventional means in the art and will not be elaborated here. Slide rails 31 are arranged on both sides in the length direction of the middle gantry 3, and sliders 57 slidably adapted to the slide rails 31 are installed on the bottom slide plate 56. The sliders 57 are at least distributed at the four corners of the bottom slide plate 56, that is, at least four sliders 57 are provided to slidably connect with the two slide rails 31.

[0028] Moreover, when the solenoid 51 is installed for the first time, the horizontal adjustment plate 52, the bottom plate 53, the horizontal adjustment assembly 54, the vertical adjustment support assembly 55, and the bottom slide plate 56 are first assembled on the middle gantry 3 and moved to the set position for fixation.

[0029] Then, the first-stage acceleration tube 61 in the acceleration tube 61 assembly 6 is connected to the beam position test assembly 16 in the front-stage component 1, the beam line is collimated, and after recording the collimation position, the support seat 62 on the middle gantry 3 is removed, and the beam intensity test assembly 15 and the beam position test assembly 16 on the middle gantry 3 are removed. Then, the bottom slide plate 56 is moved to the position vacated on the middle gantry 3, and the solenoid 51 is hoisted and installed and fixed on the horizontal adjustment plate 52 and collimated to the set point; Subsequently, subsequent steps are carried out.

[0030] Thus, by arranging the middle gantry 3 between the front-stage gantry 2 and the rear-stage gantry 4, and installing the beam intensity test assembly 15 and the beam position test assembly 16 of the front-stage component 1 on the middle gantry 3, when the solenoid 51 is installed for the first time and during maintenance and replacement after operation, only the beam intensity test assembly 15, the beam position test assembly 16, and a support seat 62 on the middle gantry 3 need to be removed, and then the solenoid clustering assembly 5 is slid to the set position to achieve the installation and replacement of the solenoid 51. In the state of the whole-line vacuum, it is not necessary to break the vacuum completely. Then, several acceleration tubes 61 are removed. Only the relevant components on the middle gantry 3 need to be removed, and the solenoid clustering assembly 5 can be taken out. Here, only one acceleration tube 61 needs to be broken vacuum, which greatly improves the installation and replacement efficiency; and this installation method requires fewer components to be disassembled on the linear accelerator, greatly reducing the difficulty of subsequent collimation operations, and the application advantages are more obvious.

[0031] In addition, referring to Figure 3 and Figure 4, a plurality of vertically arranged and vertically and horizontally intersecting reinforcing ribs 58 are fixedly connected to the bottom slide plate 56 to improve the overall support strength of the bottom slide plate 56 and ensure the levelness of the solenoid 51 mounted thereon; and a number of positioning bolts 59 for abutting against the upper end surface of the middle gantry 3 are threadedly penetrated through the bottom slide plate 56, so that the solenoid bunching assembly 5 can be directly positioned and fixed after sliding in place, which can reduce the axial collimation workload.

[0032] And a plurality of the above-mentioned horizontal adjustment assemblies 54 are provided and distributed on at least three sides of the horizontal adjustment plate 52, and the horizontal adjustment assemblies 54 are arranged at both ends of one side of the horizontal adjustment plate 52.

[0033] Refer to Figure 3 and Figure 5 , the horizontal adjustment assembly 54 includes: An adjusting block 71, fixedly connected to the side of the horizontal adjusting plate 72; An adjusting plate 72, fixedly connected to the side of the bottom plate 53 and corresponding to the adjusting block 71, and a waist-shaped hole 721 is formed therein; A first adjusting bolt 73, fixedly connected to the adjusting block 71 and penetrating through the waist-shaped hole 721; A first adjusting nut 74, threadedly connected to one end of the first adjusting bolt 73 away from the adjusting block 71; A second adjusting bolt 75, threadedly penetrating through the adjusting plate 72 and abutting against the side of the horizontal adjusting plate 72, and lock nuts 76 are threadedly connected to both the first adjusting bolt 73 and the second adjusting bolt 75.

[0034] Thus, by means of a plurality of horizontal adjustment assemblies 54 provided between the horizontal adjustment plate 52 and the bottom plate 53, by rotating the first adjusting bolt 73 and the second adjusting bolt 75 to appropriate positions, the adjustment efficiency and adjustment accuracy of the horizontal position of the horizontal adjustment plate 52 on the bottom plate 53 can be greatly improved; after the adjustment is completed, the first adjusting bolt 73 and the second adjusting bolt 75 can also be locked by loosening the nuts, further ensuring the stability of the horizontal position of the newly installed solenoid 51.

[0035] In addition, refer to Figure 3 and Figure 4 , a support plate 32 is fixedly connected to the lower part of one end of the middle gantry 3 close to the front gantry 2, and a lifting bracket 33 is fixedly connected to the support plate 32. All components in the front components 1 distributed on the middle gantry 3 are installed on the upper end surface of the lifting bracket 33. When specifically setting, a positioning groove can also be provided on the support plate 32, and a positioning block adapted to the positioning groove is provided on the lifting bracket 33, so that after the lifting bracket 33 and the beam intensity testing assembly 15 and the beam position testing assembly 16 thereon are removed, rapid positioning and reinstallation can be carried out, and only axial collimation is required, and direct positioning can be carried out in the direction perpendicular to the axial direction.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for installing a solenoid of an electron linear accelerator, characterized in that, The following steps are involved: A front stand is provided for mounting a plurality of components located at the front section of the front component; A middle platform is provided for mounting at least one component located in the rear section of the front component and a solenoid bunching component, wherein the solenoid bunching component can be slidably arranged on the middle platform; A rear stage is provided for installing an accelerating tube assembly, and the end of the first accelerating tube of the front stage of the accelerating tube assembly extends to the middle stage, and a support seat for supporting the accelerating tube is provided on the middle stage and the rear stage; When replacing the solenoid, all components belonging to the front part on the middle stand and the support seat thereon are removed, and the solenoid bunching assembly is moved toward the front stand to make the solenoid escape from the accelerating tube; Assemble the new solenoid into the solenoid bunching assembly, and push the solenoid bunching assembly toward the rear stage to allow the solenoid to be sleeved onto the accelerating tube; then install the support seat on the middle stage; Install the removed components on the middle stage and align the system.

2. The method for installing a solenoid of an electron linear accelerator according to claim 1, characterized in that, The solenoid cluster assembly comprises a solenoid, a horizontal adjustment plate, a bottom plate, a horizontal adjustment assembly, a vertical adjustment support assembly and a bottom slide plate which are arranged in sequence from top to bottom.

3. A method for installing a solenoid of an electron linear accelerator according to claim 2, characterized in that, Slide rails are arranged on both sides of the middle platform in the length direction, and sliding blocks slidably matched with the slide rails are installed on the bottom slide plate.

4. A method for installing a solenoid of an electron linear accelerator according to claim 3, characterized in that, When installing the solenoid, first assemble the horizontal adjustment plate, the bottom plate, the horizontal adjustment assembly, the vertical adjustment support assembly and the bottom slide on the middle stand, and move them to a set position and fix them; Then, the first section of the accelerating tube in the accelerating tube assembly is connected to the beam position test assembly in the front component, the beam line is aligned, and after the alignment position is recorded, the supporting seat on the middle stand is removed, and the assembly on the middle stand is removed, and the bottom slide is moved to the vacant position, and the solenoid is hoisted to the horizontal platform adjustment plate, installed and fixed, and aligned to the set point; Then proceed to the next steps.

5. A method for installing a solenoid of an electron linear accelerator according to claim 2, characterized in that, A plurality of reinforcing ribs which are vertically arranged and intersecting vertically and horizontally are fixedly connected to the bottom slide plate.

6. A method for installing a solenoid of an electron linear accelerator according to claim 2, characterized in that, The bottom slide plate is threadedly provided with a plurality of positioning bolts for tightening against the upper end surface of the middle platform.

7. A method for installing a solenoid of an electron linear accelerator according to claim 2, characterized in that, The horizontal adjustment components are provided in plurality and distributed on at least three sides of the horizontal adjustment plate, and both ends of one side of the horizontal adjustment plate are provided with horizontal adjustment components; The leveling components include: An adjustment block, fixed to the side of the horizontal adjustment plate; An adjustment plate, fixedly connected to the side of the bottom plate and corresponding to the adjustment block, with a waist-shaped hole formed thereon; A first adjusting bolt is fixed to the adjusting block and passes through the oval hole; and The first adjusting nut is threadedly connected to an end of the first adjusting bolt away from the adjusting block.

8. A method for installing a solenoid of an electron linear accelerator according to claim 7, characterized in that, Also includes: The second adjusting bolt has a thread that passes through the adjusting plate and abuts against the side of the horizontal adjusting plate.

9. A method for installing a solenoid of an electron linear accelerator according to claim 8, characterized in that The first adjusting bolt and the second adjusting bolt are both threadedly connected with anti-loosening nuts.

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

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