Superconducting magnet and magnetic field optimization method thereof

Abstract

The invention provides a superconducting magnet and a magnetic field optimization method thereof, and the method comprises the steps: building a magnet model which comprises a coil structure and an iron core structure; adjusting the section current distribution of the coil structure until the magnetic field uniformity of the magnet model in the low field meets a first preset requirement; adjusting a parameter of at least one first geometric feature on the iron core structure until the magnetic field uniformity of the magnet model in the high field meets a second preset requirement, wherein the parameter of the first geometric feature is used for representing compensation for the magnetic field uniformity in the high field; parameters of at least one second geometric feature on the iron core structure are adjusted until all high-order harmonic components of the magnetic field of the magnet model in the high field meet a third preset requirement, and the parameters of the second geometric features are used for representing harmonic suppression in the high field. The magnetic field uniformity in a high field can be adjusted under the condition that the magnetic field uniformity in a low field is not damaged, and higher magnetic field uniformity is achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of magnet technology, and more specifically, to a superconducting magnet and a method for optimizing its magnetic field. Background Art

[0002] Discrete Cosine Theta (DCT) superconducting magnets are particularly well-suited for medical ion accelerators due to their high excitation efficiency, excellent magnetic field uniformity, large aperture, and uniform stress distribution. Clinical treatment requires irradiating tumors at various locations, requiring effective control of beam energies at varying levels.

[0003] To meet these requirements, superconducting magnets used in medical particle accelerators must maintain excellent magnetic field uniformity at all speeds, from low fields (1000-5000 Gs) to high fields (3-4 T). Compared to the approximately 1.6 T maximum magnetic field of conventional magnets, superconducting magnets have a higher upper limit. Furthermore, DCT superconducting magnets lack conventional pole tips, making it difficult to optimize magnetic field uniformity through pole tip beveling. Summary of the Invention

[0004] In view of this, the present disclosure provides a superconducting magnet and a method for optimizing the magnetic field thereof.

[0005] One aspect of the present disclosure provides a method for optimizing a magnetic field of a superconducting magnet, characterized in that the method comprises:

[0006] Establish a magnet model, which includes a coil structure and an iron core structure;

[0007] Adjusting the cross-sectional current distribution of the coil structure until the magnetic field uniformity of the magnet model under low field conditions meets a first preset requirement;

[0008] Adjusting a parameter of at least one first geometric feature on the core structure until the magnetic field uniformity of the magnet model under a high field meets a second preset requirement, wherein the parameter of the first geometric feature is used to characterize compensation for the magnetic field uniformity under the high field;

[0009] Adjust parameters of at least one second geometric feature on the core structure until each high-order harmonic component of the magnetic field of the magnet model under a high field meets a third preset requirement, wherein the parameters of the second geometric feature are used to characterize harmonic suppression under the high field.

[0010] According to an embodiment of the present disclosure, the cross-sectional current distribution includes at least one multipole field component.

[0011] According to an embodiment of the present disclosure, the first geometric feature includes at least an external groove, and the parameters of the first geometric feature include at least one of a position, a radius, and a depth of the groove.

[0012] According to an embodiment of the present disclosure, the second geometric feature includes at least an external opening, and the parameters of the second geometric feature include at least one of a position, a radius, and a depth of the opening.

[0013] According to an embodiment of the present disclosure, the at least one first geometric feature is four groups of slots along the axial direction of the core structure, and the four groups of slots along the axial direction of the core structure are respectively distributed in four quadrants, and the four quadrants are obtained based on the cross-section of the core structure;

[0014] The parameters of the first geometric feature include at least one of an angular position of each group of the slots in the corresponding quadrant and a radius of the slots.

[0015] According to an embodiment of the present disclosure, the parameters of the at least one second geometric feature are four groups of openings along the radial direction of the core structure, the four groups of openings along the radial direction of the core structure are distributed in four quadrants, and the four quadrants are obtained based on the cross-section of the core structure;

[0016] The parameters of the second geometric feature include at least one of the angular position of each group of the grooves in the corresponding quadrant, the radius and the depth of the grooves.

[0017] According to an embodiment of the present disclosure, the at least one multipolar field component includes a dipole field component, a quadrupole field component, a hexapole field component, and an octupole field component;

[0018] The values of the dipole field component, quadrupole field component, hexapole field component and octupole field component are between -0.1 and 0.1.

[0019] According to an embodiment of the present disclosure, the opening is provided at an end portion of the core structure.

[0020] Another aspect of the present disclosure provides a superconducting magnet, comprising:

[0021] The coil structure has a magnetic field uniformity at low field that meets the first preset requirement;

[0022] The iron core structure has at least one first geometric feature and at least one second geometric feature, wherein the parameters of the first geometric feature are used to characterize the compensation for magnetic field uniformity under high field, and the parameters of the second geometric feature are used to characterize the harmonic suppression under the high field.

[0023] According to an embodiment of the present disclosure, the first geometric feature comprises at least a slot along the axial direction of the core structure;

[0024] The second geometric feature includes at least an opening along the radial direction of the core structure.

[0025] According to an embodiment of the present disclosure, first, the cross-sectional current distribution of the coil structure is adjusted, and then the parameters of at least one first geometric feature and at least one second geometric feature on the core structure are adjusted. The operation is simple and can meet the requirements of adjusting the magnetic field uniformity under high field without destroying the magnetic field uniformity under low field, thereby achieving higher magnetic field uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0027] Figure 1 A flow chart schematically illustrates a method for optimizing a magnetic field of a superconducting magnet according to an embodiment of the present disclosure;

[0028] Figure 2 Schematically shows a cross-sectional current distribution diagram of a coil structure according to an embodiment of the present disclosure;

[0029] Figure 3 Schematically shows a schematic diagram of a core structure according to an embodiment of the present disclosure;

[0030] Figure 4 Schematically shows an architecture diagram of magnetic field optimization of a superconducting magnet according to an embodiment of the present disclosure;

[0031] Figure 5 A block diagram schematically shows a magnetic field optimization device for a superconducting magnet according to an embodiment of the present disclosure; and

[0032] Figure 6 The block diagram schematically shows an electronic device suitable for implementing a robot according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0034] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of the features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0035] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0036] When expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0037] An embodiment of the present disclosure provides a superconducting magnet and a method for optimizing a magnetic field thereof. The superconducting magnet includes: a coil structure, wherein the magnetic field uniformity under low field meets a first preset requirement; an iron core structure, having at least one first geometric feature and at least one second geometric feature. The parameters of the first geometric feature are used to characterize the compensation for the magnetic field uniformity under high field, and the parameters of the second geometric feature are used to characterize the harmonic suppression under high field, and the superconducting magnet can be compatible with high field and low field.

[0038] Figure 1 The flowchart of the magnetic field optimization method of the superconducting magnet according to the embodiment of the present disclosure is schematically shown.

[0039] like Figure 1 As shown, the method includes operations S110 to S140.

[0040] In operation S110 , a magnet model is established, where the magnet model includes a coil structure and a core structure.

[0041] The coil structure generates the main magnetic field through current distribution. The design of the current distribution can affect the magnetic field strength and uniformity. Coil structures can include solenoid coils, Helmholtz coils, toroidal coils, and others. For example, a solenoid coil is a long cylindrical winding with closely spaced conductors along the axial direction, resulting in a uniform current distribution across the conductor cross-section. Solenoid coils can generate an axially uniform magnetic field, making them suitable for use in equipment such as MRI and NMR.

[0042] During the establishment of the magnet model, the number of coil turns, coil end length, coil straight segment length, etc. of the coil structure can be determined according to requirements.

[0043] The core structure is used to concentrate magnetic flux, increase magnetic field strength, and compensate for the non-idealities of the coil structure. During the magnet model establishment process, the core outer diameter and core thickness can be determined according to requirements.

[0044] In operation S120 , the cross-sectional current distribution of the coil structure is adjusted until the magnetic field uniformity of the magnet model under low field meets a first preset requirement.

[0045] Cross-sectional current distribution refers to the distribution of current density and flow direction on the cross section of the coil structure. Figure 2 FIG. 1 shows a cross-sectional current distribution of a coil structure. The cross-sectional current distribution includes at least one multipolar field component, such as a dipole field component, a quadrupole field component, a hexapole field component, and an octupole field component.

[0046] The first preset requirement can be determined based on user needs. In some embodiments, the magnetic field uniformity under low field conditions can be fine-tuned to the magnetic field performance required by the user by combining optimization algorithms such as genetic algorithms and particle swarm algorithms.

[0047] In operation S130 , a parameter of at least one first geometric feature on the core structure is adjusted until the magnetic field uniformity of the magnet model under a high field meets a second preset requirement.

[0048] In some embodiments, the parameters of the first geometric feature are used to characterize the compensation for magnetic field uniformity at high fields. Figure 3 As shown, the first geometric feature may be an external slot, and the parameters of the first geometric feature include at least one of the position, radius and depth of the slot. The external slot may be a slot along the axial direction of the core structure.

[0049] The second preset requirement may be to optimize the uniformity of the magnetic field under high field to the order of 0.3%, or to optimize the uniformity of the magnetic field under high field to the order of 0.5%. This disclosure does not limit this.

[0050] In operation S140 , a parameter of at least one second geometric feature on the core structure is adjusted until each high-order harmonic component of the magnetic field of the magnet model under a high field meets a third preset requirement.

[0051] In some embodiments, the parameters of the second geometric feature are used for harmonic suppression. Figure 3 As shown, the second geometric feature may be an external opening, and the parameters of the second geometric feature include at least one of the position, radius, and depth of the opening. The opening may be an opening along the radial direction of the core structure. The opening may be located at an end or in the middle, which is not limited in this disclosure.

[0052] The third preset requirement can be to optimize the high-order harmonic components of the magnetic field under high field to the order of one ten-thousandth, or to optimize the high-order harmonic components of the magnetic field under high field to the order of two ten-thousandths. This disclosure does not limit this.

[0053] According to the embodiments of the present disclosure, the above coil structure and core structure optimization process can adjust the high field uniformity without destroying the optimized low field uniformity, thereby achieving high and low field compatible magnetic field uniformity optimization.

[0054] Reference below Figure 4 , combined with specific embodiments Figure 1 The method shown is further explained.

[0055] Figure 4 The figure schematically shows an architecture diagram of the magnetic field optimization of a superconducting magnet according to an embodiment of the present disclosure.

[0056] For a DCT type superconducting coil, its coil structure distribution can be represented by a set of shape functions:

[0057]

[0058]

[0059] The coil structure distribution can be determined by a total of seven parameters: m1~m4, N, Le, and Lst. N, Le, and Lst are the number of coil turns, the length of the coil end, and the length of the coil straight section. They can be determined in advance after the magnet design indicators are clarified.

[0060] In one embodiment, the at least one first geometric feature is four groups of slots extending along the axial direction of the core structure. The four groups of slots extending along the axial direction of the core structure are respectively distributed in four quadrants, where the four quadrants are divided based on a cross section A of the core structure. Parameters of the first geometric feature include at least one of an angular position of each group of slots within a corresponding quadrant and a radius of the slots.

[0061] In one embodiment, the parameters of the at least one second geometric feature are four groups of openings along a radial direction of the core structure, wherein the four groups of openings along the radial direction of the core structure are distributed in four quadrants, wherein the four quadrants are divided based on a cross section A of the core structure. The parameters of the second geometric feature include at least one of the angular position of each group of slots within the corresponding quadrant, the radius of the slots, and the depth of the slots.

[0062] In the embodiment of the present disclosure, there is no limitation on the number of each group of slots and openings. For example, the number of each group of slots along the axial direction of the core structure is one, and the number of each group of openings along the radial direction of the core structure is one. The core structure includes the core outer diameter R_out, the core thickness D_yoke, and the positions of the core external slots 11-14 P_g1, P_g2, P_g3, P_g4 (their centers are set at the edge of the core outer diameter), the radii of the core external slots 11-14 R_g1, R_g2, R_g3, R_g4; as well as the positions of the core external openings 21-24 P_h1, P_h2, P_h3, P_h4, the radii of the core external openings 21-24 R_h1, R_h2, R_h3, R_h4, and the depths of the core external openings 21-24 D_h1, D_h2, D_h3, D_h4. A total of 22 parameters are used to fine-tune and optimize the magnetic field. Among them, the core outer diameter R_out and the core thickness D_yoke can be determined in advance after the magnet design indicators are clarified.

[0063] First, a magnet model is established under low field according to the above description, and then the multipole field components m1~m4 shown in Table 1 are adjusted. The magnetic field uniformity under low field is fine-tuned to the required magnetic field performance by combining optimization algorithms such as genetic algorithm and particle swarm algorithm.

[0064] parameter illustrate Parameter setting range m1 Dipolar field component -0.1~0.1 m2 quadrupole field components -0.1~0.1 m3 Sextupole field component -0.1~0.1 m4 Octupole field component -0.1~0.1

[0065] Then, if the magnet already meets the low-field requirements, the optimized coil parameters remain unchanged. By optimizing the core structure, the high-field magnetic field uniformity can be adjusted without compromising the low-field magnetic field uniformity. As shown in Table 2, the core structure can be optimized by adjusting the positions P_g1, P_g2, P_g3, and P_g4 of the core's external slots 11-14 and the radii R_g1, R_g2, R_g3, and R_g4 of the core's external slots 11-14. The magnetic field uniformity can be adjusted by combining genetic algorithms, particle swarm optimization algorithms, and other methods. Through iterative optimization of this optimization method, the magnetic field uniformity at high fields can be optimized to a level of 0.03%.

[0066] Table 2

[0067] parameter illustrate Parameter setting range P_g1 External slot 11 positions 0°~90° P_g2 External slotted 12 positions 90°~180° P_g3 External slot 13 positions 180°~270° P_g4 External slots 14 positions 270°~360° R_g1 External slot 11 radius 0~100mm R_g2 External slotting 12 radius 0~100mm R_g3 External slot 13 radius 0~100mm R_g4 External slot 14 radius 0~100mm

[0068] Finally, as shown in Table 3, the positions P_h1, P_h2, P_h3, P_h4 of the core end openings 21-24, the radii R_h1, R_h2, R_h3, R_h4 of the core end openings 21-24, and the depths D_h1, D_h2, D_h3, D_h4 of the core end openings 21-24 can be adjusted, and the magnetic field uniformity can be adjusted in combination with genetic algorithms, particle swarm algorithms, etc. The iterative optimization of the optimization method provided by the present disclosure can optimize the high-order harmonic components of the magnetic field under high field conditions to the order of one ten-thousandth. The above core structure optimization process can adjust the high field uniformity without destroying the already optimized low field uniformity, thereby achieving high and low field compatible magnetic field uniformity optimization.

[0069] Table 3

[0070] parameter illustrate Parameter setting range P_h1 External opening 21 position 0°~90° P_h2 External opening 22 position 90°~180° P_h3 External opening 23 position 180°~270° P_h4 24 external openings 270°~360° R_h1 External opening 21 radius 0~100mm R_h2 External opening 22 radius 0~100mm R_h3 External opening 23 radius 0~100mm R_h4 External opening 24 radius 0~100mm D_h1 External opening 21 depth 0~150mm D_h2 External opening 22 depth 0~150mm D_h3 External opening 23 depth 0~150mm D_h4 External opening 24 depth 0~150mm

[0071] Figure 5 A block diagram schematically shows a magnetic field optimization device for a superconducting magnet according to an embodiment of the present disclosure.

[0072] like Figure 5 As shown, the magnetic field optimization device 500 includes a modeling module 510 , a first adjustment module 520 , a second adjustment module 530 and a third adjustment module 540 .

[0073] A modeling module 510 is used to establish a magnet model, where the magnet model includes a coil structure and an iron core structure;

[0074] A first adjustment module 520 is configured to adjust the cross-sectional current distribution of the coil structure until the magnetic field uniformity of the magnet model under low field conditions meets a first preset requirement;

[0075] a second adjustment module 530, configured to adjust a parameter of at least one first geometric feature on the core structure until the magnetic field uniformity of the magnet model under a high field meets a second preset requirement, wherein the parameter of the first geometric feature is used to characterize compensation for the magnetic field uniformity under the high field;

[0076] The third adjustment module 540 is used to adjust the parameters of at least one second geometric feature on the core structure until the high-order harmonic components of the magnetic field of the magnet model under high field meet the third preset requirements, and the parameters of the second geometric feature are used to characterize the harmonic suppression under the high field.

[0077] According to the embodiments of the present invention, any number of modules, sub-modules, units, and sub-units, or at least part of the functions of any number of them, can be implemented in one module. According to the embodiments of the present invention, any one or more of the modules, sub-modules, units, and sub-units can be split into multiple modules for implementation. According to the embodiments of the present invention, any one or more of the modules, sub-modules, units, and sub-units can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application-specific integrated circuit (ASIC), or can be implemented by hardware or firmware in any other reasonable way of integrating or packaging the circuit, or can be implemented in any one of the three implementation methods of software, hardware, and firmware, or in any appropriate combination of any of them. Alternatively, according to the embodiments of the present invention, one or more of the modules, sub-modules, units, and sub-units can be at least partially implemented as a computer program module, which can perform the corresponding functions when the computer program module is executed.

[0078] For example, any multiple of the modeling module 510, the first adjustment module 520, the second adjustment module 530, and the third adjustment module 540 can be combined into a single module / unit / sub-unit, or any one of these modules / units / sub-units can be split into multiple modules / units / sub-units. Alternatively, at least part of the functionality of one or more of these modules / units / sub-units can be combined with at least part of the functionality of other modules / units / sub-units and implemented in a single module / unit / sub-unit. According to an embodiment of the present disclosure, at least one of the modeling module 510, the first adjustment module 520, the second adjustment module 530, and the third adjustment module 540 can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or can be implemented in hardware or firmware by any other reasonable means of integrating or packaging circuits, or can be implemented in any one of the three implementation methods of software, hardware, and firmware, or any appropriate combination of any of these. Alternatively, at least one of the modeling module 510 , the first adjustment module 520 , the second adjustment module 530 , and the third adjustment module 540 may be at least partially implemented as a computer program module, which may perform corresponding functions when executed.

[0079] It should be noted that the magnetic field optimization device part of the superconducting magnet in the embodiment of the present disclosure corresponds to the magnetic field optimization method part of the superconducting magnet in the embodiment of the present disclosure. The description of the magnetic field optimization device part of the superconducting magnet specifically refers to the data processing method part, which will not be repeated here.

[0080] Figure 6 A block diagram of an electronic device suitable for implementing the above-described method according to an embodiment of the present disclosure is schematically shown. Figure 6 The electronic device shown is only an example and should not limit the functions and scope of use of the embodiments of the present disclosure.

[0081] like Figure 6 As shown, the electronic device 600 according to an embodiment of the present disclosure includes a processor 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage portion 608 into a random access memory (RAM) 603. The processor 601 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or a related chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 601 may also include onboard memory for caching purposes. The processor 601 may include a single processing unit or multiple processing units for performing different actions of the method flow according to the embodiment of the present disclosure.

[0082] Various programs and data required for the operation of the electronic device 600 are stored in the RAM 603. The processor 601, ROM 602, and RAM 603 are connected to each other via a bus 604. The processor 601 executes the various operations of the method flow according to the embodiment of the present disclosure by executing the programs in the ROM 602 and / or RAM 603. It should be noted that the programs may also be stored in one or more memories other than the ROM 602 and RAM 603. The processor 601 may also execute the various operations of the method flow according to the embodiment of the present disclosure by executing the programs stored in the one or more memories.

[0083] According to an embodiment of the present disclosure, electronic device 600 may further include an input / output (I / O) interface 605, which is also connected to bus 604. System 600 may also include one or more of the following components connected to I / O interface 605: an input section 606 including a keyboard, mouse, etc.; an output section 607 including devices such as a cathode ray tube (CRT), liquid crystal display (LCD), and speakers; a storage section 608 including a hard disk; and a communication section 609 including a network interface card such as a LAN card or modem. Communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to I / O interface 605 as needed. Removable media 611, such as a magnetic disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed in drive 610 as needed, so that computer programs read from the removable media can be installed into storage section 608 as needed.

[0084] According to an embodiment of the present disclosure, the method flow according to an embodiment of the present disclosure can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 609, and / or installed from the removable medium 611. When the computer program is executed by the processor 601, the above-mentioned functions defined in the system of the embodiment of the present disclosure are executed. According to an embodiment of the present disclosure, the system, equipment, device, module, unit, etc. described above can be implemented by a computer program module.

[0085] The present disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments, or may exist independently and not be incorporated into the device / apparatus / system. The computer-readable storage medium carries one or more programs, and when executed, implements the method according to the embodiments of the present disclosure.

[0086] According to embodiments of the present disclosure, a computer-readable storage medium may be a non-volatile computer-readable storage medium. Examples include, but are not limited to, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0087] For example, according to an embodiment of the present disclosure, the computer-readable storage medium may include the ROM 602 and / or the RAM 603 described above and / or one or more memories other than the ROM 602 and the RAM 603 .

[0088] An embodiment of the present disclosure also includes a computer program product, which includes a computer program, and the computer program contains program code for executing the method provided by the embodiment of the present disclosure. When the computer program product runs on an electronic device, the program code is used to enable the electronic device to implement the method provided by the embodiment of the present disclosure.

[0089] When the computer program is executed by the processor 601, the above functions defined in the system / device of the embodiment of the present disclosure are performed. According to the embodiment of the present disclosure, the system, device, module, unit, etc. described above can be implemented by a computer program module.

[0090] In one embodiment, the computer program may be stored on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may be transmitted and distributed in the form of a signal on a network medium, downloaded and installed via the communication portion 609, and / or installed from a removable medium 611. The program code contained in the computer program may be transmitted using any appropriate network medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0091] According to an embodiment of the present disclosure, the program code for executing the computer program provided by the embodiment of the present disclosure can be written in any combination of one or more programming languages. Specifically, these computer programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages include, but are not limited to, languages such as Java, C++, Python, "C" or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, using an Internet service provider to connect via the Internet).

[0092] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of the systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the boxes may occur in an order different from that marked in the accompanying drawings. For example, two boxes shown in succession may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, as well as the combination of boxes in the block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or may be implemented using a combination of dedicated hardware and computer instructions. It will be understood by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined and / or coupled in various ways, even if such combinations or couplings are not explicitly described in the present disclosure. In particular, without departing from the spirit and teachings of the present disclosure, the features described in the various embodiments and / or claims of the present disclosure may be combined and / or coupled in various ways, and all such combinations and / or couplings fall within the scope of the present disclosure.

[0093] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A method for optimizing the magnetic field of a superconducting magnet, characterized in that: The method comprises: Establish a magnet model, which includes a coil structure and an iron core structure; Adjusting the cross-sectional current distribution of the coil structure until the magnetic field uniformity of the magnet model under low field conditions meets a first preset requirement; Adjusting a parameter of at least one first geometric feature on the core structure until the magnetic field uniformity of the magnet model under a high field meets a second preset requirement, wherein the parameter of the first geometric feature is used to characterize compensation for the magnetic field uniformity under the high field; Adjust parameters of at least one second geometric feature on the core structure until each high-order harmonic component of the magnetic field of the magnet model under a high field meets a third preset requirement, wherein the parameters of the second geometric feature are used to characterize harmonic suppression under the high field.

2. The method according to claim 1, characterized in that The cross-sectional current distribution includes at least one multipole field component.

3. The method according to claim 1, characterized in that The first geometric feature includes at least an external groove, and the parameters of the first geometric feature include at least one of a position, a radius, and a depth of the groove.

4. The method according to claim 1, wherein The second geometric feature includes at least an external opening, and the parameters of the second geometric feature include at least one of a position, a radius, and a depth of the opening.

5. The method according to claim 1 or 3, characterized in that The at least one first geometric feature is four groups of slots along the axial direction of the core structure, wherein the four groups of slots along the axial direction of the core structure are respectively distributed in four quadrants, and the four quadrants are obtained based on the cross-section of the core structure; The parameters of the first geometric feature include at least one of an angular position of each group of the slots in the corresponding quadrant and a radius of the slots.

6. The method according to claim 1 or 4, characterized in that The parameters of the at least one second geometric feature are four groups of openings along the radial direction of the core structure, the four groups of openings along the radial direction of the core structure are distributed in four quadrants, and the four quadrants are obtained based on the cross-section of the core structure; The parameters of the second geometric feature include at least one of the angular position of each group of the grooves in the corresponding quadrant, the radius and the depth of the grooves.

7. The method according to claim 2, characterized in that The at least one multipole field component includes a dipole field component, a quadrupole field component, a hexapole field component and an octupole field component; The values of the dipole field component, quadrupole field component, hexapole field component and octupole field component are between -0.1 and 0.

1.

8. The method according to claim 4, characterized in that The opening is arranged at an end of the core structure.

9. A superconducting magnet, characterized in that: include: The coil structure has a magnetic field uniformity at low field that meets the first preset requirement; The iron core structure has at least one first geometric feature and at least one second geometric feature, wherein the parameters of the first geometric feature are used to characterize the compensation for magnetic field uniformity under high field, and the parameters of the second geometric feature are used to characterize the harmonic suppression under the high field.

10. The superconducting magnet according to claim 9, characterized in that The first geometric feature comprises at least a slot along the axial direction of the core structure; The second geometric feature includes at least an opening along the radial direction of the core structure.

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