A slicing magnet for a compact particle accelerator

Abstract

The application relates to a cutting magnet for miniaturized particle accelerators, which comprises a magnet core in a top-and-bottom half structure, the large-diameter end of the magnet core is provided with a notch groove, the notch groove is an air gap and the inner wall forms a pole surface; an excitation coil, which comprises a saddle-shaped coil body wound by a plurality of turns of wires, and a plurality of turns of wires at the inlet end and the outlet end of the saddle-shaped coil body are vertically and spacedly arranged respectively; the coil body is embedded into the air gap of the magnet core; and a copper bus, a plurality of turns of wires at the inlet end and the outlet end of the coil body are welded with the copper bus respectively to connect the plurality of turns of wires in series, and the copper bus is used for connecting an external cable. The application has simple structure, is convenient to install, and saves installation space and manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of accelerator magnet technology, and more specifically to a cutting magnet for miniaturized particle accelerators. Background Technology

[0002] With the continuous development of science and technology, particle accelerators are not only important experimental devices for scientific research, but also have broad application prospects in fields such as industrial and agricultural production, medical and health care, energy and environment, and aerospace.

[0003] The continuous development of radiotherapy technology has led to the advancement of medical accelerators towards higher precision, higher efficiency, and smaller size, thus placing increasingly higher demands on certain specialized components. As a key component of synchrotron injection extraction, the cutting magnet is located at the intersection of the synchrotron loop and the injection extraction transport line. Therefore, miniaturizing the medical accelerator requires the cutting magnet to achieve miniaturization and weight reduction while efficiently deflecting the beam without affecting the circulating beam.

[0004] Based on the working principle of the cutting magnet, and considering the spatial limitations of the cutting magnet's position and the shielding of the leakage field, the overall structure is relatively complex. The iron core is usually made of C-shaped silicon steel sheets stacked together. To ensure magnetic field quality, the excitation coil is wound in a saddle-shaped structure with symmetrical upper and lower windings, and a single-turn water channel structure is used to ensure cooling. This structure can effectively deflect the beam and ensure the operational stability of the excitation coil under large electromagnetic forces. However, its installation conditions in the accelerator dictate the use of a bracket with a sliding rail mechanism. This allows the iron core to be moved out via the sliding rail before the coil is installed, ensuring sufficient space for smooth installation. After the iron core is moved out, the lower coil is placed and fixed in place, the vacuum pipe is installed, and then the iron core is moved back. The upper coil is then adjusted and installed in the remaining confined space. The installation process requires manual support and adjustment of the upper coil for a long time. Furthermore, the moving mechanism results in a large radial dimension of the magnet bracket, typically 2.5 times the width of the iron core, requiring a large installation space and increasing manufacturing costs.

[0005] Therefore, for miniaturized particle accelerators for medical use, there is an urgent need for a compact cutting magnet structure to save space and cost. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a cutting magnet for miniaturized particle accelerators. For miniaturized accelerators, especially for cutting magnets operating in DC mode, this structure is simple, easy to install, and saves installation space and manufacturing costs.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The cutting magnet for miniaturized particle accelerators described in this invention comprises:

[0009] The magnetic core has a two-half structure, and the large-diameter end of the magnetic core is provided with a notch. The notch is an air gap and the inner wall forms a pole surface.

[0010] The excitation coil includes a coil body wound into a saddle shape by a number of turns of wire, and the turns of wire at the inlet and outlet ends of the saddle-shaped coil body are arranged vertically at intervals; the coil body is embedded in the air gap of the magnet core;

[0011] A copper busbar is provided, wherein several turns of wire at the inlet and outlet ends of the coil body are welded to the copper busbar to connect the turns of wire in series. The copper busbar is used for connecting external cables.

[0012] Preferably, in the cutting magnet, each turn of the conductor is made of copper conductor with an outer inter-turn insulation wrapping the inner circle, and the copper conductor has a hollow tubular structure.

[0013] Preferably, the excitation coils of the cutting magnet are in two sets, and the two sets of excitation coils are arranged opposite to each other.

[0014] Preferably, the cutting magnet further includes a cooling water pipe assembly; the cooling water pipe assembly includes a main manifold and branch pipes; two main manifolds are respectively vertically arranged, and each main manifold is connected to several branch pipes; wherein, several branch pipes on one main manifold are respectively connected to several turns of wire at the inlet end of the coil body; and several branch pipes on the other main manifold are respectively connected to several turns of wire at the outlet end of the coil body.

[0015] Preferably, the cutting magnet further includes a shielding and fixing assembly, which is a C-shaped shell structure with openings at both the top and bottom. The shielding and fixing assembly covers the large-diameter end of the magnet core and is fixed to the magnet core to shield against leakage field.

[0016] Preferably, the cutting magnet further includes a coil support assembly; the coil support assembly includes a first support and a second support; the first support is fixedly disposed on a first side of the magnet core for fixing the excitation coil; the second support is fixedly disposed on a second side of the magnet core for fixing the excitation coil; the main current collector is fixed on the coil support assembly.

[0017] Preferably, the cutting magnet further includes a magnet bracket; the magnet bracket is fixed to the bottom of the coil bracket assembly and is used to support the entire cutting magnet device.

[0018] Preferably, the core of the cutting magnet is made of electrical pure iron DT4 soft magnetic material.

[0019] Preferably, the inter-turn insulation of the cut magnet is made by semi-overlapping polyimide and glass ribbon, and then vacuum-cast with epoxy resin.

[0020] Preferably, the cutting magnet has a lifting lug at the top of the magnet core, which is used to lift the upper part of the magnet core.

[0021] The present invention has the following advantages due to the adoption of the above technical solutions:

[0022] The present invention simplifies the processing technology of the iron core through the above technical solution. At the same time, the upper and lower iron core structure makes it relatively easy to install the excitation coil without repeatedly moving the iron core and disassembling the coil support. This makes the support structure simpler without moving the guide rail structure, saving installation space and manufacturing costs in miniaturized accelerators. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the cutting magnet used in the miniaturized particle accelerator according to the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the magnet core structure in the image;

[0026] Figure 3 yes Figure 1 A schematic diagram of the excitation coil in the diagram;

[0027] Figure 4 yes Figure 1 A schematic diagram showing the connection between the energizing copper busbar and the excitation coil wires;

[0028] Figure 5 yes Figure 1 A schematic diagram of the cooling water pipe assembly in the diagram;

[0029] Figure 6 yes Figure 1 A schematic diagram of the shielding and fixing components in the diagram;

[0030] Figure 7 yes Figure 1 A schematic diagram of the coil support structure in the diagram;

[0031] Figure 8 yes Figure 1 A schematic diagram of the structure of the magnet support in the image.

[0032] The labels for the attached figures are as follows:

[0033] 1-Magnetic core; 2-Excitation coil; 201-Coil body; 202-Wire; 3-Power busbar; 4-Cooling water pipe assembly; 401-Main manifold; 402-Branch pipe; 5-Shielding fixing assembly; 6-Coil support assembly; 601-First support; 602-Second support; 7-Magnet support; 8-Lifting lug. Detailed Implementation

[0034] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0035] This invention provides a cutting magnet for miniaturized particle accelerators. By changing the installation method of the coil through the upper and lower structure of the magnet core, the magnet support can be designed to be simpler, easier to install and manufacture, and save space and manufacturing costs.

[0036] like Figure 1 As shown, the cutting magnet for miniaturized particle accelerators provided by the present invention includes: a magnet core 1 (see...) Figure 2 It has a two-half structure, and the large-diameter end of the magnet core is provided with a notch. The notch is an air gap and the inner wall forms a pole surface.

[0037] Excitation coil 2, such as Figure 3 As shown, it includes a coil body 201 formed by winding several turns of wire into a saddle shape, and several turns of wire 202 at the inlet and outlet ends of the saddle-shaped coil body are arranged vertically at intervals; the coil body 201 is embedded in the air gap of the magnet core 1;

[0038] Connect to copper busbar 3, such as Figure 4 As shown, several turns of wire 202 at the inlet and outlet ends of the coil body 201 are welded to the power busbar 3 to connect the several turns of wire 202 in series. The power busbar 3 is used for connecting external cables.

[0039] In the above embodiments, preferably, each turn of wire 202 is made of copper wire with an outer inter-turn insulation wrapping the inner circle, and the copper wire has a hollow tubular structure to facilitate the passage of cooling water.

[0040] In the above embodiment, preferably, there are two sets of excitation coils 2, which are arranged opposite to each other.

[0041] In the above embodiments, preferably, the present invention further includes a cooling water pipe assembly 4; such as Figure 5 As shown, the cooling water pipe assembly 4 includes a main manifold 401 and branch pipes 402. Two main manifolds 401 are vertically arranged, and each main manifold 401 is connected to several branch pipes 402. Several branch pipes 402 on one main manifold 401 are connected to several turns of wire 202 at the inlet end of the coil body 201; several branch pipes 402 on the other main manifold 401 are connected to several turns of wire 202 at the outlet end of the coil body 201. In practical use, cooling water is introduced into one main manifold 401, and cooling water is recovered from the other main manifold 401.

[0042] In the above embodiments, preferably, the present invention further includes a shielding fixing component 5, such as... Figure 6 As shown, the shielding and fixing component 5 is a C-shaped shell structure with openings at both the top and bottom. The shielding and fixing component 5 is placed over the large-diameter end of the magnet core 1 and fixed to the magnet core 1 to shield the leakage field.

[0043] In the above embodiments, preferably, the present invention further includes a coil support assembly 6; as shown Figure 7 As shown, the coil support assembly includes a first support 601 and a second support 602; the first support 601 is fixedly disposed on the first side of the magnet core 1 for fixing the excitation coil 2; the second support 602 is fixedly disposed on the second side of the magnet core 1 for fixing the excitation coil 2; the main collector 401 is fixed on the coil support assembly 6, specifically, fixed on the first support 601.

[0044] In the above embodiments, preferably, the present invention further includes a magnet support 7 (see... Figure 8 The magnet bracket 7 is fixed to the bottom of the coil bracket assembly 6 to support the entire device for cutting magnets.

[0045] In the above embodiments, preferably, the magnet core 1 is made of electrical pure iron DT4 soft magnetic material.

[0046] In the above embodiments, preferably, the inter-turn insulation is made by half-overlapping polyimide and glass ribbon, and is formed by vacuum epoxy casting.

[0047] In the above embodiment, preferably, the top of the magnetic core 1 has a lifting lug 8, which is used to lift the upper part of the magnetic core.

[0048] In use, the cooling water pipe assembly 4 uses an external cooling device to provide cooling water to the excitation coil, and the connecting copper busbar 3 is used to transmit current to the excitation coil 2, so that an effective deflection magnetic field is generated in the pole area of ​​the magnet core 1, deflecting the ion beam to the desired direction. During installation, since the magnet core 1 has an upper and lower structure, after the magnet bracket is installed in place, the upper part of the magnet core 1 is lifted up, and the excitation coil 2 can be placed directly in place without disassembling the coil bracket 6. The upper half of the magnet core can then be closed. Disassembly is done in the same way. In this way, the size of the magnet bracket only needs to meet the support strength, without having to make the size very large to ensure the radial travel of the magnet core 1, and making disassembly and assembly relatively easy.

[0049] This invention provides a cutting magnet for miniaturized particle accelerators, which saves on installation space and manufacturing costs when the required magnetic field strength is not high and DC operation is performed. It overcomes the large installation space and higher cost brought about by the commonly used iron core and support structure, and provides a new design solution for the development of miniaturized accelerators.

[0050] 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 cutting magnet for a miniaturized particle accelerator, characterized in that, include: The magnetic core has a two-half structure, and the large-diameter end of the magnetic core is provided with a notch. The notch is an air gap and the inner wall forms a pole surface. The excitation coil includes a coil body wound into a saddle shape by a number of turns of wire, and the turns of wire at the inlet and outlet ends of the saddle-shaped coil body are arranged vertically at intervals; the coil body is embedded in the air gap of the magnet core; A copper busbar is provided, wherein several turns of wire at the inlet and outlet ends of the coil body are welded to the copper busbar to connect the turns of wire in series. The copper busbar is used for connecting external cables.

2. The cutting magnet according to claim 1, characterized in that, Each turn of the conductor is made of copper wire with an outer inter-turn insulation layer wrapping the inner circle, and the copper wire has a hollow tubular structure.

3. The cutting magnet according to claim 2, characterized in that, The excitation coils are in two sets, and the two sets of excitation coils are arranged opposite to each other.

4. The cutting magnet according to claim 2 or 3, characterized in that, It also includes cooling water pipe assemblies; The cooling water pipe assembly includes a main manifold and branch pipes; The two main manifolds are respectively installed vertically, and each main manifold is connected to several branch pipes; Among them, several branch pipes on one of the main manifolds are respectively connected to several turns of wire at the inlet end of the coil body; several branch pipes on another main manifold are respectively connected to several turns of wire at the outlet end of the coil body.

5. The cutting magnet according to claim 4, characterized in that, It also includes a shielding and fixing assembly, which is a C-shaped shell structure with openings at both the top and bottom. The shielding and fixing assembly covers the large-diameter end of the magnetic core and is fixed to the magnetic core to shield against leakage.

6. The cutting magnet according to claim 4, characterized in that, It also includes a coil support assembly; The coil support assembly includes a first support and a second support; The first bracket is fixedly mounted on the first side of the magnetic core and is used to fix the excitation coil; The second bracket is fixedly mounted on the second side of the magnet core and is used to fix the excitation coil; The main manifold is fixed to the coil support assembly.

7. The cutting magnet according to claim 6, characterized in that, It also includes a magnetic support; The magnet bracket is fixed to the bottom of the coil bracket assembly to support the entire device for cutting magnets.

8. The cutting magnet according to claim 1, characterized in that, The magnet core is made of electrical pure iron DT4 soft magnetic material.

9. The cutting magnet according to claim 2, characterized in that, The inter-turn insulation is made by semi-overlapping polyimide and glass ribbon, and then vacuum-cast with epoxy resin.

10. The cutting magnet according to claim 1, characterized in that, The top of the magnet core has a lifting lug, which is used to lift the upper part of the magnet core.

Images