Permanent magnet type magnet for beam probe

Abstract

The present application relates to the technical field of magnet of particle accelerator, and provide a kind of permanent magnet type magnet for beam probe, permanent magnet type magnet includes magnet frame and permanent magnet assembly, the inner periphery side of magnet frame forms square hole;Permanent magnet assembly is set to the inner periphery side of the magnet frame, the permanent magnet assembly is in contact with the magnet frame to form closed magnetic circuit, and the inside of the permanent magnet assembly generates single direction magnetic field.The present application solves the defect that the structure of electromagnet is more complex on the beam probe, the aperture of permanent magnet assembly is large, with high-precision and high-quality magnetic field.Magnetic field precision and magnetic field quality are guaranteed by the machining precision of permanent magnet block and the installation distribution position, using permanent magnet excitation, without water cooling system, equipment maintenance is simple, zero power consumption.Adopting the size and position of permanent magnet block are optimized to adjust the precision and quality of magnetic field, which is convenient and simple.

Description

Technical Field

[0001] This invention relates to the field of magnet technology for particle accelerators, and more particularly to a permanent magnet type magnet for beam detectors. Background Technology

[0002] In particle accelerator devices, the Faraday tube is an important device in the beam detector, which measures parameters such as the size and uniformity of the charged particle beam. As the beam energy increases, conventional Faraday tubes cannot suppress charged particles by electric fields alone, and a confinement magnetic field needs to be added.

[0003] In existing technologies, confinement magnetic fields are generally generated by electromagnets. However, the Faraday cylinder in a beam detector is sealed in a vacuum. First, the insulation layer of traditional electromagnet coils is generally made of organic materials, which can adversely affect the acquisition of a vacuum and is easily damaged in a strong radiation environment. Second, the Faraday cylinder needs to perform one-dimensional linear motion during the start and end of the test, which places high demands on the design of the electromagnet coil's lead wire structure. Moreover, the reciprocating motion reduces the lifespan of the coil's lead wire structure, requiring frequent replacement, which is detrimental to the stability of the entire system. Furthermore, the electromagnet with a coil structure is heavy, making it difficult to install at the end of the Faraday cylinder. These factors make adding an electromagnet to the Faraday cylinder of a beam detector complex and increase costs.

[0004] Therefore, how to solve the problems of stability, simple installation, and light weight of confined magnetic field equipment is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a permanent magnet for beam detectors, which solves the problems of the complexity and increased cost of adding electromagnets to beam detectors in the prior art, and achieves a simple structure, large aperture, light weight, easy fabrication and good magnetic field quality.

[0006] This invention provides a permanent magnet for a beam detector, comprising: A magnet frame, hollow inside, with a square hole formed on the inner periphery of the magnet frame; A permanent magnet assembly is disposed on the inner periphery of the magnet frame. The permanent magnet assembly contacts the magnet frame to form a closed magnetic circuit, and a magnetic field in a single direction is generated on the inner side of the permanent magnet assembly.

[0007] According to the present invention, a permanent magnet for a beam detector includes: A first permanent magnet block is disposed on the first side of the magnet frame, and the first permanent magnet block is used to generate a magnetic field in a first direction after being magnetized; A second permanent magnet block is disposed on the second side of the magnet frame, and the second permanent magnet block is used to generate a magnetic field in the first direction after being magnetized; wherein the second side and the first side are disposed opposite to each other; The third permanent magnet is arranged in pairs on the third and fourth sides of the magnet frame, and the third permanent magnet is used to generate a magnetic field in a second direction, wherein the second direction is opposite to the first direction. The fourth permanent magnet is arranged in pairs on the third and fourth sides of the magnet frame, and each pair of the fourth permanent magnet generates a magnetic field in the third direction and the fourth direction, respectively, wherein the third direction and the fourth direction are opposite, and the third direction is perpendicular to the first direction; The first permanent magnet block, the second permanent magnet block, the third permanent magnet block, and the fourth permanent magnet block are all in contact with the magnet frame to form a closed magnetic circuit, forming a magnetic field with the magnetic field direction along the first direction.

[0008] According to the present invention, a permanent magnet for a beam detector is provided, wherein the fourth permanent magnet includes two pairs, the two pairs of the fourth permanent magnet are respectively located on opposite sides of the third permanent magnet, and the fourth permanent magnet and the third permanent magnet are spaced apart.

[0009] According to the present invention, a permanent magnet for a beam detector is provided, wherein the first permanent magnet block is elongated and a first slot is provided on the side of the first permanent magnet block facing away from the magnet frame.

[0010] According to the present invention, a permanent magnet for a beam detector is provided, wherein the second permanent magnet block is elongated and a second slot is provided on the side of the second permanent magnet block facing away from the magnet frame.

[0011] According to the present invention, a permanent magnet for a beam detector is provided, wherein the third permanent magnet block includes a plurality of permanent magnet units, the plurality of adjacent permanent magnet units abutting each other, and the abutting surface between the permanent magnet units is perpendicular to the first direction.

[0012] According to the present invention, a permanent magnet for a beam detector is provided, wherein the magnet frame is provided with a mounting structure for connecting to the beam detector.

[0013] According to the present invention, a permanent magnet for a beam detector is provided, wherein a plurality of positioning grooves are provided on the inner circumference side of the magnet frame, and the positioning grooves are used to correspondingly install the first permanent magnet block, the second permanent magnet block, the third permanent magnet block and the fourth permanent magnet block.

[0014] This invention provides a permanent magnet for a beam detector. A square hole is formed by the inner periphery of a magnet frame, and a permanent magnet assembly is disposed on the inner periphery of the magnet frame. The permanent magnet assembly contacts the magnet frame to form a closed magnetic circuit, and a unidirectional magnetic field is generated inside the permanent magnet assembly. This provides the following advantages: (1) The permanent magnet assembly has a large aperture, which provides a high-precision and high-quality magnetic field. The accuracy and quality of the magnetic field are guaranteed by the processing accuracy and installation distribution of the permanent magnet blocks.

[0015] (2) Permanent magnet excitation is used, eliminating the need for a water cooling system, simplifying equipment maintenance, and resulting in zero power consumption. The magnetic field accuracy and quality are adjusted by optimizing the size and position of the permanent magnet blocks, which is convenient and simple. If the magnet aperture is large, the thickness of the permanent magnet blocks can be increased, and the gap between adjacent permanent magnet blocks can be increased or decreased.

[0016] (3) Reduced project cost. There is no cost for electrical power consumption equipment or water cooling equipment, resulting in a significant reduction in cost compared to traditional electromagnets. The permanent magnet is a regular cuboid with a single magnetization direction and form. There are no electrical or water cooling components inside the magnet, thus reducing the overall cost of the magnet.

[0017] (4) Reduced long-term operating costs: Permanent magnets have a simple structure, consume no electrical power and do not require water cooling, are reliable in operation and easy to maintain, which can increase the operational reliability of the beam detector and significantly reduce the long-term operating costs of the accelerator. Attached Figure Description

[0018] 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.

[0019] Fig. 1 This is a schematic diagram of the permanent magnet type for beam detectors provided by the present invention.

[0020] Fig. 2 This is a schematic diagram of the magnetization direction of a permanent magnet for a beam detector provided by the present invention.

[0021] Figure label: 10. Magnet frame; 11. Positioning groove; 21. First permanent magnet block; 22. Second permanent magnet block; 23. Third permanent magnet block; 24. Fourth permanent magnet block; 211. First slot; 221. Second slot. Detailed Implementation

[0022] 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.

[0023] The following is combined with Figs. 1-2 The present invention describes a permanent magnet for a beam detector, comprising a magnet frame 10 and a permanent magnet assembly, the permanent magnet assembly comprising a plurality of permanent magnet blocks fixed on the magnet frame 10.

[0024] The magnet frame 10 is hollow inside, and the inner periphery of the magnet frame 10 forms a square hole. The hollow square hole structure provides an assembly reference and accommodation space for the internal permanent magnet assembly, ensuring the accuracy of the magnetic block installation position.

[0025] The magnet frame 10 is the supporting structure of the entire magnet and also serves as a magnetic conductive structure. It is made of electrical pure iron or other soft magnetic materials. The soft magnetic material can provide a low magnetic resistance loop for the magnetic lines of force generated by the permanent magnet, thereby enhancing the magnetic field strength generated by the permanent magnet assembly, concentrating the magnetic flux in the central working area, improving magnet efficiency, and reducing energy loss.

[0026] The magnet frame 10 is used to fix the entire permanent magnet to the beam detector equipment, ensuring structural stability and vibration resistance during equipment operation. It is possible, but not limited to, to install four mounting threaded holes on the magnet frame 10, through which the magnet frame 10 and the beam detector equipment are threadedly fixed.

[0027] The permanent magnet assembly is disposed on the inner periphery of the magnet frame 10. The permanent magnet assembly and the magnet frame 10 are in contact to form a closed magnetic circuit, and a magnetic field in one direction is generated on the inner side of the permanent magnet assembly.

[0028] The permanent magnet assembly includes a first permanent magnet block 21, a second permanent magnet block 22, a third permanent magnet block 23, and a fourth permanent magnet block 24, which are embedded inside the magnet frame 10. The permanent magnet assembly is constructed by splicing or welding multiple blocks, which simplifies the manufacturing process and reduces production costs compared to using permanent magnets with complex shapes.

[0029] The first permanent magnet block 21 is disposed on the first side of the magnet frame 10, which can be understood as the inner top side; the second permanent magnet block 22 is disposed on the second side of the magnet frame 10, which can be understood as the inner bottom side; that is, the first permanent magnet block 21 and the second permanent magnet block 22 are disposed opposite to each other. The third permanent magnet block 23 and the fourth permanent magnet block 24 are located on the third inner side and the fourth inner side of the magnet frame 10, which can be understood as the left and right sides.

[0030] like Fig. 2 As shown, the first permanent magnet block 21 is the excitation structure at the top of the permanent magnet assembly. It is made of a long strip of permanent magnet material and is used to generate a magnetic field in the first direction after being magnetized. The first direction can be understood as the upward direction. The first permanent magnet block 21 provides the basis for establishing the core vertical magnetic field component in the central region of the magnet.

[0031] The second permanent magnet block 22 is the excitation structure at the bottom of the permanent magnet assembly. It is made of a long strip of permanent magnet material. After being magnetized, the second permanent magnet block 22 is used to generate a magnetic field in the first direction. The magnetization direction of the second permanent magnet block 22 is the same as that of the first permanent magnet block 21. The two work together to concentrate and enhance the magnetic field lines in the central working area.

[0032] The third permanent magnet block 23 is the excitation structure on both sides of the permanent magnet assembly. It is arranged in pairs on the third and fourth sides of the magnet frame 10. The third permanent magnet block 23 is used to generate a magnetic field in a second direction, which is opposite to the first direction, that is, the third permanent magnet block 23 generates a downward magnetic field.

[0033] The fourth permanent magnet block 24 is the excitation structure on both sides of the permanent magnet assembly. It is arranged in pairs on the third and fourth sides of the magnet frame 10, and each pair of fourth permanent magnet blocks 24 generates a magnetic field in a third direction and a fourth direction, respectively. The third and fourth directions are opposite, and the third direction is perpendicular to the first direction; that is, if one of the third and fourth directions is to the left, the other is to the right. The fourth permanent magnet blocks 24 form a complete magnetic flux loop, guiding the magnetic flux from the third permanent magnet block 23 back into the magnet frame 10, enhancing the magnetic field strength in the central region, and reducing magnetic leakage from the entire magnet structure to the external environment, thus achieving a highly efficient, compact, and highly concentrated permanent magnet structure.

[0034] Furthermore, the first permanent magnet block 21, the second permanent magnet block 22, the third permanent magnet block 23 and the fourth permanent magnet block 24 can be embedded inside the magnet frame 10.

[0035] In some feasible embodiments of the present invention, the fourth permanent magnet block 24 includes two pairs, the two pairs of fourth permanent magnet blocks 24 are located on opposite sides of the third permanent magnet block 23, and the fourth permanent magnet block 24 and the third permanent magnet block 23 are spaced apart, decomposing the originally complete side magnetic block into multiple independent magnetic blocks and arranging them at specific intervals, effectively adjusting and improving the magnetic field quality of the central region without increasing the overall complexity.

[0036] In some feasible embodiments of the present invention, the third permanent magnet block 23 includes multiple permanent magnet units and adopts a multi-block structure, which can reduce processing difficulty and manufacturing cost, improve material utilization and production efficiency, and also enhance design flexibility to adapt to diverse application scenarios and performance requirements.

[0037] Preferably, in some feasible embodiments of the present invention, a plurality of positioning grooves 11 are provided on the inner circumference of the magnet frame 10. The positioning grooves 11 ensure that each permanent magnet block can be accurately installed in a preset position, thus guaranteeing the accuracy and consistency of the magnetic field distribution of the entire magnet system. The positioning grooves 11 are used to correspondingly install the first permanent magnet block 21, the second permanent magnet block 22, the third permanent magnet block 23, and the fourth permanent magnet block 24.

[0038] In one specific embodiment, please refer to Figs. 1-2 The permanent magnet for beam detectors of the present invention includes a magnet frame 10 and a permanent magnet assembly. Multiple threaded holes can be opened on the magnet frame 10 for fixing the entire permanent magnet to the beam detector equipment. The magnet frame 10 is the supporting structure for the entire magnet and is made of electrical pure iron or other soft magnetic materials to enhance the magnetic field strength generated by the permanent magnet assembly and reduce energy loss. The permanent magnet assembly is the excitation structure of the entire magnet, embedded inside the magnet frame 10. The permanent magnet assembly includes a first permanent magnet block 21 at the top, a second permanent magnet block 22 at the bottom, a third permanent magnet block 23 in the middle of the left and right sides, and a fourth permanent magnet block 24 at the upper and lower parts of the left and right sides. The first permanent magnet block 21 is the excitation structure at the top of the magnet, made of a long strip of permanent magnet material, with a first slot 211 on the surface at the corresponding position. After being magnetized, it is used to generate an upward magnetic field. The second permanent magnet block 22 is the excitation structure at the bottom of the magnet, made of a long strip of permanent magnet material, with a second slot 221 on the surface at the corresponding position. After being magnetized, it is used to generate an upward magnetic field. The fourth permanent magnet block 24 is made of permanent magnet material, and there are four of them in total. After being magnetized, they generate magnetic fields in different directions at different positions. The third permanent magnet block 23 is made of permanent magnet material, with four on each side. After being magnetized, they generate a downward magnetic field simultaneously.

[0039] During production, the first permanent magnet block 21 and the second permanent magnet block 22 are grooved and magnetized on their respective surfaces and then installed on the top inner side and bottom inner side of the magnet frame 10. The third permanent magnet block 23 is installed in the middle position on the left and right sides of the magnet frame 10, and the fourth permanent magnet block 24 is installed on the left and right sides of the magnet frame 10.

[0040] In use, the magnet frame 10 is fixedly connected to the Faraday tube of the beam detector. The magnetic field generated by the permanent magnet assembly installed inside the magnet frame 10 is enhanced by the magnet frame 10, and a stable and uniform confinement magnetic field is generated within the aperture surrounded by the permanent magnet block, thereby suppressing the passing charged particles.

[0041] 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 permanent magnet for beam detectors, characterized in that, include: The magnet frame (10) is hollow inside, and the inner periphery of the magnet frame (10) forms a square hole; A permanent magnet assembly is disposed on the inner periphery of the magnet frame (10). The permanent magnet assembly contacts the magnet frame (10) to form a closed magnetic circuit, and a magnetic field in a single direction is generated on the inner side of the permanent magnet assembly.

2. The permanent magnet for a beam detector according to claim 1, characterized in that, The permanent magnet assembly includes: The first permanent magnet block (21) is disposed on the first side of the magnet frame (10), and the first permanent magnet block (21) is used to generate a magnetic field in the first direction after being magnetized; The second permanent magnet block (22) is disposed on the second side of the magnet frame (10), and the second permanent magnet block (22) is used to generate a magnetic field in the first direction after being magnetized; wherein the second side and the first side are disposed opposite to each other; The third permanent magnet (23) is arranged in pairs on the third and fourth sides of the magnet frame (10), and the third permanent magnet (23) is used to generate a magnetic field in a second direction, wherein the second direction is opposite to the first direction; The fourth permanent magnet (24) is arranged in pairs on the third and fourth sides of the magnet frame (10), and each pair of the fourth permanent magnet (24) generates a magnetic field in the third direction and the fourth direction, respectively, wherein the third direction and the fourth direction are opposite, and the third direction is perpendicular to the first direction; Among them, the first permanent magnet block (21), the second permanent magnet block (22), the third permanent magnet block (23) and the fourth permanent magnet block (24) are all in contact with the magnet frame (10) to form a closed magnetic circuit and form a magnetic field with the magnetic field direction along the first direction.

3. The permanent magnet for a beam detector according to claim 1, characterized in that, The fourth permanent magnet block (24) includes two pairs, and the two pairs of the fourth permanent magnet blocks (24) are located on opposite sides of the third permanent magnet block (23), and the fourth permanent magnet block (24) and the third permanent magnet block (23) are arranged at intervals.

4. The permanent magnet for a beam detector according to claim 1, characterized in that, The first permanent magnet block (21) is elongated, and a first slot (211) is provided on the side of the first permanent magnet block (21) facing away from the magnet frame (10).

5. The permanent magnet for a beam detector according to claim 1, characterized in that, The second permanent magnet block (22) is elongated, and a second slot (221) is provided on the side of the second permanent magnet block (22) facing away from the magnet frame (10).

6. The permanent magnet for a beam detector according to claim 1, characterized in that, The third permanent magnet block (23) includes multiple permanent magnet units, multiple adjacent permanent magnet units abutting each other, and the abutting surfaces between the permanent magnet units are perpendicular to the first direction.

7. The permanent magnet for a beam detector according to any one of claims 2-6, characterized in that, The magnet frame (10) is provided with an installation structure for connecting to the beam detector.

8. The permanent magnet for a beam detector according to claim 7, characterized in that, The inner circumference of the magnet frame (10) is provided with a plurality of positioning grooves (11), which are used to install the first permanent magnet block (21), the second permanent magnet block (22), the third permanent magnet block (23) and the fourth permanent magnet block (24).

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