Method of changing the deflection radius of an electromagnetic separator

Abstract

The embodiment of the present application discloses a method for changing the deflection radius of an electromagnetic separator. The electromagnetic separator comprises an electromagnet for generating a magnetic field for separating isotopes. The method comprises: step S10, arranging a magnetic field patch on the surface of the electromagnet, the magnetic field patch being used for changing the magnetic induction intensity of the magnetic field; wherein the magnetic field patch is spliced by a plurality of patches; step S20, determining an expected magnetic field curve corresponding to the expected deflection radius according to the expected deflection radius of the isotope beam to be separated in the magnetic field; step S30, determining the shape and size of the magnetic field patch corresponding to the expected magnetic field curve according to the expected magnetic field curve; and step S40, splitting and re-splicing the plurality of patches, so that the magnetic field patch has the corresponding shape and size, to change the deflection radius of the electromagnetic separator. The method in the embodiment of the present application can flexibly change the deflection radius of the electromagnetic separator.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electromagnetic separation technology, specifically to a method for changing the deflection radius of an electromagnetic separator. Background Technology

[0002] Electromagnetic separation is a commonly used isotope separation method. Compared to other methods, electromagnetic separation yields isotopes with high abundance, making it the best choice for preparing high-abundance isotopes. Currently, the single separation mode of electromagnetic separators cannot meet diverse separation needs. More flexible separation modes are needed to improve separation efficiency and expand the range of isotopes obtained, thus satisfying future demands from various fields for stable isotopes in terms of both variety and yield. For example, multiple ion sources could be placed in a single electromagnetic separator to simultaneously separate two isotopes. These improvements require changing the deflection radius of the electromagnetic separator. Summary of the Invention

[0003] According to an embodiment of the present invention, a method for changing the deflection radius of an electromagnetic separator is provided. The electromagnetic separator includes an electromagnet, which generates a magnetic field for separating isotopes. The method includes: step S10, setting a magnetic field pad on the surface of the electromagnet, the magnetic field pad being used to change the magnetic induction intensity of the magnetic field; wherein the magnetic field pad is composed of multiple pads spliced ​​together; step S20, determining a desired magnetic field curve corresponding to the desired deflection radius of the isotope beam to be separated in the magnetic field; step S30, determining the shape and size of the magnetic field pad corresponding to the desired magnetic field curve based on the desired magnetic field curve; step S40, disassembling and reassembling the multiple pads to give the magnetic field pad a specific shape and size, thereby changing the deflection radius of the electromagnetic separator.

[0004] In this embodiment of the invention, a magnetic field pad composed of multiple shims is provided on the surface of the electromagnet. These shims can be disassembled and combined according to different deflection radius requirements, resulting in magnetic field pads of different shapes and sizes. This allows for flexible adjustment of the deflection radius of the electromagnetic separator, achieving effective separation of isotopes at different deflection radii. The method in this embodiment allows for flexible adjustment of the deflection radius of the electromagnetic separator, freeing the isotope separation mode from the design and fabrication of the magnetic field shims. This greater flexibility allows for improvements in the separation method to meet the separation requirements of different isotopes, thereby increasing vacuum chamber utilization and isotope separation efficiency. Attached Figure Description

[0005] Other objects and advantages of the invention will become apparent from the following description of embodiments of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention.

[0006] Figure 1This is a schematic diagram of an electromagnetic separator according to an embodiment of the present invention.

[0007] Figure 2 This is a schematic diagram of the structure of a magnetic field pad according to an embodiment of the present invention.

[0008] Figure 3 yes Figure 2 A schematic diagram of the structure of the medium magnetic field pad from another perspective.

[0009] Figure 4 This is a schematic diagram of the distribution of isotope beams in a magnetic field according to an embodiment of the present invention.

[0010] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0011] Figure 6 This is a schematic diagram of the structure of a magnetic field pad according to another embodiment of the present invention.

[0012] Figure 7 This is a schematic diagram of the isotope beam distribution of an electromagnetic separator before the deflection radius is changed, according to an embodiment of the present invention.

[0013] Figure 8 yes Figure 7 A schematic diagram of the isotope beam distribution after the deflection radius of the electromagnetic separator is changed.

[0014] Figure 9 This is a schematic diagram of the magnetic field curve before adjustment and the expected magnetic field curve of the magnetic field pad patch according to an embodiment of the present invention.

[0015] Figure 10 It is based on Figure 9 A schematic diagram of the structure of the magnetic field padding component determined by the expected magnetic field curve.

[0016] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Vacuum chamber; 2. Ion source; 3. Receiver; 4. Isotope ion beam;

[0019] 10. Magnetic field pad; 11. Gasket; 20. Electromagnet. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person with ordinary skill in the art to which this application pertains. Where the terms "first," "second," etc., are used throughout the text, they are used only to distinguish similar objects and should not be construed as indicating or implying their relative importance, order of precedence, or implicitly specifying the number of technical features indicated. It should be understood that the data described by "first," "second," etc., can be interchanged where appropriate. Where "and / or" appears throughout the text, it means including three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. Furthermore, for ease of description, spatial relative terms such as "above," "below," "top," "bottom," etc., may be used here, only to describe the spatial positional relationship between one device or feature as shown in the figure and other devices or features. It should be understood that this also includes different orientations in use or operation besides those shown in the figure.

[0022] Figure 1 A schematic diagram of an electromagnetic separator according to an embodiment of the present invention is shown. Figure 1 As shown, the electromagnetic separator includes a vacuum chamber 1, an ion source 2, an electromagnet, and a receiver 3. The ion source 2 emits the isotope ion beam 4 to be separated into the vacuum chamber 1. The electromagnet generates a magnetic field B within the vacuum chamber 1, which drives and deflects the ion beam 4 within the chamber. The receiver 3 is positioned along the deflected path of the isotope ion beam 4 to receive the separated isotopes. Isotope ion beams 4 of different masses are deflected with different deflection radii R in the magnetic field B, thereby achieving isotope separation.

[0023] like Figure 2 and Figure 3As shown, in some embodiments, a magnetic field pad 10 is provided on the surface of the electromagnet 20. The magnetic field pad 10 is used to adjust the deflection radius of isotope ions in the magnetic field, and different magnetic field pads 10 correspond to different deflection radii. Therefore, the magnetic field pad 10 is an important factor in determining the focusing capability of the magnetic field. In this embodiment, a corresponding magnetic field pad 10 can be designed according to the deflection radius or magnetic field requirements to ensure that the isotope ions are in the optimal separation state at the corresponding deflection radius. In some embodiments, the magnetic field pad 10 is a magnetic field shim, and the magnetic field pad 10 can be made of pure iron material.

[0024] Specifically, taking an electromagnetic separator with a deflection radius of approximately 1.7 meters for a certain isotope as an example, the distribution of the isotope ion beams in the magnetic field is as follows: Figure 4 As shown and Figure 5 As shown. Figure 4 As shown and Figure 5 As shown, the deflection diameter of the isotope ion beam 4 is approximately 340 cm, which is equivalent to a deflection radius of approximately 1.7 meters. When the deflection radius is approximately 1.7 meters, the isotope ion beam 4 experiences the strongest magnetic field focusing effect after being deflected by the magnetic field, resulting in the smallest image width W. Figure 5 As shown, isotope ion beams 41 and 42 do not overlap after deflection, which is most conducive to the reception of each isotope ion beam. By placing the receiver 3 at this deflected position, the separation of each isotope can be achieved. When the deflection radius is less than 1.7 meters, the focusing ability of the isotope ion beam 4 by the magnetic field weakens, the image width W increases, affecting the received isotope abundance and even making it difficult to separate the isotopes.

[0025] In this embodiment, in order to ensure the abundance of isotopes after separation, so that the isotope ion beam is in the state of being most focused by the magnetic field when it is received, when using the same electromagnetic separator for isotope separation, parameters such as ion source 2 or magnetic field strength can be adjusted so that the isotope ion beam is deflected to a fixed position for reception.

[0026] It should be noted that after being deflected by a magnetic field, the isotopic ion beam forms a beam with a certain width at the receiver position; this width is called the image width. If the image width is too large, it will lead to interdoping between isotopes, affecting the isotope separation effect.

[0027] To enable the electromagnetic separator to have flexible separation modes, thereby improving its separation efficiency and expanding the types of isotopes it can separate, it is necessary to change the deflection radius of the electromagnetic separator.

[0028] However, the inventors discovered that the deflection radius and magnetic field requirements of electromagnetic separators are predetermined during design and manufacturing, ensuring the isotope beam achieves optimal separation at the designed deflection radius. This limits the flexibility of changing the deflection radius. Furthermore, since different deflection radii require different magnetic field strengths, the demand for magnetic field pads also varies. Each change to the deflection radius necessitates redesigning, manufacturing, and installing new magnetic field pads, resulting in limited flexibility. Moreover, traditional magnetic field pads are extremely large, weighing up to ten tons, leading to very high costs and significant manpower and material resource consumption, further restricting the flexibility of changing the deflection radius of electromagnetic separators.

[0029] Based on this, embodiments of the present invention provide a method for changing the deflection radius of an electromagnetic separator. The method of this embodiment includes the following steps S10 to S40.

[0030] Step S10: A magnetic field pad 10 is placed on the surface of the electromagnet 20. The magnetic field pad 10 is used to change the magnetic induction intensity of the magnetic field. Figure 6 As shown, the magnetic field pad 10 is composed of multiple pads 11 spliced ​​together.

[0031] Step S20: Determine the expected magnetic field curve corresponding to the expected deflection radius of the isotope beam to be separated in the magnetic field.

[0032] Step S30: Determine the shape and size of the magnetic field pad 10 corresponding to the expected magnetic field curve based on the expected magnetic field curve.

[0033] In step S40, multiple pads 11 are disassembled and reassembled to give the magnetic field pad 10 a shape and size to change the deflection radius of the electromagnetic separator.

[0034] In this embodiment, the magnetic field pad 10 is composed of multiple detachable pads 11. By disassembling and reassembling the multiple pads 11, the multiple pads 11 can be assembled into magnetic field pads 10 of different shapes and sizes according to different deflection radius requirements, thus realizing the change of the magnetic field pad 10 and thereby achieving flexible change of the deflection radius. Using the method in this embodiment avoids the problem of needing to redesign, process, and install the magnetic field pads every time the deflection radius is changed, and also greatly reduces the manpower and material resources consumed during processing and installation due to the large size and high cost of the magnetic field pads.

[0035] In some embodiments, the gasket 11 is made of pure iron, is small in size and thin, and is easy to install. Multiple gaskets 11 can be flexibly combined and spliced ​​to obtain magnetic field pads 10 of different shapes and sizes. For example, the thickness of the gasket 11 can be several centimeters, and the length can be tens of centimeters. For instance, the thickness of the gasket 11 is less than 5 cm, and the length is 20 to 50 cm.

[0036] In some embodiments, step S30 includes steps S31 to S34.

[0037] Step S31: Establish a finite element model of the electromagnetic separator. The finite element model includes an electromagnet 20 and a magnetic field pad 10 connected to the electromagnet 20.

[0038] Step S32: Set the shape and size of the magnetic field pad 10 in the finite element model, and simulate and calculate the magnetic field curve corresponding to the magnetic field pad 10.

[0039] Step S33: Adjust the shape and size of the magnetic field pad 10 to correct the magnetic field curve corresponding to the magnetic field pad 10, and obtain the iterated magnetic field curve.

[0040] Step S34, repeat step S33 until the magnetic field curve after iteration meets the predetermined requirements.

[0041] To change the deflection radius of the electromagnetic separator, this embodiment redesigns the magnetic field curve corresponding to the required deflection radius. Using steps S31 to S34, the shape and size of the magnetic field pad 10 are redesigned based on the required magnetic field curve, thereby meeting the needs of different magnetic field pads 10 for different deflection radii. When there are separation requirements with different deflection radii, the change in the deflection radius of the electromagnetic separator can be achieved simply by reassembling the magnetic field pad 10.

[0042] Specifically, finite element simulation software can be used to establish finite element models of the magnetic field pad 10 and the electromagnet 20, set the initial shape and size of the magnetic field pad 10, and perform multiple iterative calculations on the shape, size, and corresponding magnetic field curve of the magnetic field pad 10 to make the magnetic field curve of the magnetic field pad 10 close to the desired expected magnetic field curve. In this embodiment, the magnetic field pad 10 that can achieve the expected magnetic field curve is fitted by finite element simulation, so that multiple pads 11 can be recombined and spliced ​​into the fitted magnetic field pad shape, so as to obtain the required deflection radius using the magnetic field pad 10.

[0043] For example, such as Figure 7As shown, if the deflection radius of a certain isotope in the original magnetic field is too small, the focusing ability of the isotope ion beam weakens, the beam width of the isotope ion beam increases, and isotope ion beams 41 and 42 partially overlap, affecting the abundance of the isotope and even causing the two isotopes to be unable to separate. The method described in this embodiment can be used to adjust the shape and size of the magnetic field pad 10, thereby changing the deflection radius of the electromagnetic separator to meet the separation requirements of this isotope. Figure 8 As shown, the modified deflection radius is appropriate, the image width of the isotope ion beam is small, and the isotope ion beam 41 and isotope ion beam 42 do not overlap at a certain position after deflection, thereby achieving the separation of the isotope.

[0044] In some embodiments, in step S33, adjusting the shape and size of the magnetic field pad 10 includes adjusting at least one of the length, width, and curvature of the surface of the magnetic field pad 10. For example... Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the magnetic field pad 10 is attached to the surface of the electromagnet 20. The side of the magnetic field pad 10 away from the electromagnet 20 can be a curved surface. In this embodiment, the curvature of the curved surface in the magnetic field pad 10 can be adjusted.

[0045] It should be noted that the shape of the magnetic field pad 10 is not limited to that shown. Figure 6 The shape shown can also be other shapes. This embodiment does not limit the shape of the magnetic field pad 10. The shape of the magnetic field pad 10 can be adjusted according to the desired magnetic field curve.

[0046] In some embodiments, in order to calculate the magnetic field curve corresponding to the magnetic field pad 10, in step S32, as follows: Figure 2 , Figure 3 , Figure 6 As shown, firstly, a three-dimensional coordinate system is established, where the x-axis is parallel to the connection surface between the magnetic field pad 10 and the electromagnet 20, and the z-axis is perpendicular to the connection surface between the magnetic field pad 10 and the electromagnet 20, and the magnetic field pad 10 is symmetrical with respect to the plane z=0; secondly, the magnetic induction intensity components B of the magnetic field curve corresponding to the magnetic field pad 10 on the y-axis and z-axis are determined. y and B z According to the magnetic induction intensity component B in the magnetic field y and B z This will allow you to obtain the magnetic field curve corresponding to the magnetic field pad 10.

[0047] For example Figure 6Taking the magnetic field pad 10 as an example, in the three-dimensional coordinate system, the x-axis is perpendicular to the paper and outwards, the z-axis is perpendicular to the connecting surface between the magnetic field pad 10 and the electromagnet 20 and upwards, and the y-axis is parallel to the connecting surface between the magnetic field pad 10 and the electromagnet 20 and to the right. In this embodiment, the origin of the coordinate system can be located at the center of the magnetic field.

[0048] In some embodiments, when determining the magnetic flux density component B y and B z At that time, the magnetic induction intensity B0 of the initial magnetic field generated by the electromagnet 20 and the increment b of the magnetic induction intensity in the y-axis and z-axis directions after setting the magnetic field pad 10 can be used as the basis. y b z B was calculated separately. y and B z .

[0049] Specifically, the component B of the magnetic induction intensity in the y-axis direction y The following formula (1) can be used for calculation:

[0050] B y (y,z)=B0b y (y,z) (1)

[0051] The component of magnetic flux density in the z-axis direction, B z The following formula (2) can be used for calculation:

[0052] B z (y,z)=B0[1+b z (y,z)] (2)

[0053] Where B0 is the magnetic induction intensity of the initial magnetic field formed by electromagnet 20; b y The increment of the magnetic induction intensity value in the y-axis direction after setting the magnetic field pad 10, measured in units of B0; b z The magnetic field strength increment along the z-axis, measured in units of B0, is the magnetic field strength after the magnetic field pad 10 is installed. In this embodiment, the initial magnetic field can be either a uniform field or a non-uniform field.

[0054] By using the above iterative calculation steps and performing multiple iterative calculations on the magnetic field curve, the shape of the magnet pad with the smallest error corresponding to the expected magnetic field curve can be simulated.

[0055] Figure 9 The diagram shows the magnetic field curve corresponding to the initial magnetic field pad before adjustment and a schematic diagram of the expected magnetic field curve. Figure 10 It shows according to Figure 9 A schematic diagram of the magnetic field pad structure obtained from the simulation of the expected magnetic field curve. (See attached diagram.) Figure 10As shown in the figure, point C represents the difference between the magnetic field curve corresponding to the initial magnetic field pad and the expected magnetic field curve. The shape of the magnetic field pad needs to be adjusted to make its corresponding magnetic field curve closer to the expected magnetic field curve. The adjusted magnetic field curve is quite close to the expected magnetic field curve, meeting the requirements of the expected magnetic field curve. Figure 10 The shape of the corresponding magnetic field pad 10 after adjustment is shown, which can be based on... Figure 10 The shape of the magnetic field pad 10 obtained from the simulation is used to reassemble and splice the pad 11 so that the deflection radius of the electromagnetic separator meets the requirements.

[0056] In some embodiments, step S33 further includes: determining the error value between the iterated magnetic field curve and the expected magnetic field curve, thereby determining whether the magnetic field curve corresponding to the iterated magnetic field pad 10 meets the requirements, so as to obtain a magnetic field curve that is close to or the same as the expected magnetic field curve.

[0057] In some embodiments, in step S34, the predetermined requirement includes: the error value is less than or equal to an error threshold. When the error value between the magnetic field curve obtained by simulation calculation in step S33 and the expected magnetic field curve is less than or equal to the error threshold, the magnetic field curve meets the predetermined requirement, and the iterative calculation can be stopped. At this time, the magnetic field pad 10 meets the requirement of the required deflection radius. When the error value is greater than the error threshold, the magnetic field curve does not meet the predetermined requirement, and iterative calculation of the shape and size of the magnetic field pad 10 is required to obtain a magnetic field pad 10 that meets the requirements. In this embodiment, the error threshold can be set according to actual needs.

[0058] Further, in step S33, the iterated magnetic field curve can be compared with the expected magnetic field curve to determine the position corresponding to the maximum magnetic induction intensity error between the magnetic field curve and the expected magnetic field curve; then, the difference between the magnetic induction intensity of the magnetic field curve at the corresponding position and the magnetic induction intensity of the expected magnetic field curve is calculated as the error value. In some embodiments, the position of maximum magnetic induction intensity error between the magnetic field curve and the expected magnetic field curve can be determined by observation.

[0059] In this embodiment, only the maximum difference between the magnetic induction intensity of the magnetic field curve and the expected magnetic field curve can be calculated as the error value, saving time and improving the efficiency of simulation calculation. Furthermore, the simulated magnetic field curve can be made closer to the expected magnetic field curve, resulting in a more suitable magnetic field pad 10.

[0060] In some embodiments, when it is impossible to determine the point where the error between the magnetic field curve and the expected magnetic field curve is the largest by observation, the region with a large error between the two can be identified, the difference between the magnetic induction intensity of the magnetic field curve corresponding to each position in the region and the magnetic induction intensity of the expected magnetic field curve can be calculated, and the largest difference can be selected as the error value between the magnetic field curve and the expected magnetic field curve.

[0061] Furthermore, in step S33, B can be calculated separately. y The first difference between the magnetic flux density component in the y-axis direction and the expected magnetic field curve, and B z The second difference between the first and second differences and the expected magnetic field curve in the z-axis direction. When both the first and second differences are less than or equal to the error threshold, the magnetic field curve meets the predetermined requirements, and the shape and size of the magnetic field pad 10 can be obtained. When either the first or second difference is greater than the error threshold, the shape and size of the magnetic field pad 10 are adjusted to iterate the magnetic field curve.

[0062] In some embodiments, in step S40, multiple pads 11 can be spliced ​​together to form a magnetic field pad patch 10, with adjacent pads 11 bonded together. Specifically, based on the shape and size of the magnetic field pad patch 10 obtained in step S30, multiple pads 11 can be combined and spliced ​​together by bonding to form the required magnetic field pad patch 10, thereby achieving arbitrary magnetic field curve transformation and meeting the separation requirements of different deflection radii.

[0063] In some embodiments, in step S40, multiple gaskets 11 can be spliced ​​together to form a magnetic field pad 10, with a fastener connecting adjacent gaskets 11. For example, the fastener can be a screw or bolt. Specifically, based on the shape and size of the magnetic field pad 10 obtained in step S30, multiple gaskets 11 can be combined and spliced ​​together using the fastener to form the desired magnetic field pad 10, thereby achieving arbitrary magnetic field curve transformations and meeting the separation requirements of different deflection radii.

[0064] The method in this embodiment of the invention can flexibly change the deflection radius of the electromagnetic separator. This embodiment replaces the integral magnetic field pad 10 with multiple small, thin pads 11 that can be disassembled and reassembled. Through simulation of the magnetic field pad 10, a reliable combination scheme for the magnetic field pad 10 is provided. In practical applications, the magnetic field pad 10 can be disassembled and reassembled according to the magnetic field requirements corresponding to different deflection radii, thus flexibly changing the deflection radius of the electromagnetic separator. The method in this embodiment of the invention is flexible and convenient, and the magnetic field pad 10 can be reused, greatly saving costs.

[0065] The method described in this invention can improve the flexibility of existing electromagnetic separator separation modes, thereby developing a variety of isotope separation modes to improve separation efficiency and provide support for meeting the needs of various fields for stable isotopes in terms of variety and yield.

[0066] Regarding the embodiments of the present invention, it should also be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0067] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for changing the deflection radius of an electromagnetic separator, characterized in that, The electromagnetic separator includes an electromagnet used to generate a magnetic field for separating isotopes; the method includes: Step S10: A magnetic field pad is provided on the surface of the electromagnet. The magnetic field pad is used to change the magnetic induction intensity of the magnetic field. The magnetic field pad is composed of multiple pads spliced ​​together. Step S20: Determine the expected magnetic field curve corresponding to the expected deflection radius of the isotope beam to be separated in the magnetic field. Step S30: Determine the shape and size of the magnetic field pad corresponding to the expected magnetic field curve based on the expected magnetic field curve; Step S40: Disassemble and reassemble multiple gaskets to give the magnetic field pads the corresponding shape and size, thereby changing the deflection radius of the electromagnetic separator; Step S30 includes: Step S31: Establish a finite element model of the electromagnetic separator, the finite element model including the electromagnet and the magnetic field pad; Step S32: Set the shape and size of the magnetic field pad in the finite element model, and simulate and calculate the magnetic field curve corresponding to the magnetic field pad. Step S33: Adjust the shape and size of the magnetic field pad to correct the magnetic field curve corresponding to the magnetic field pad, and obtain the iterated magnetic field curve; Step S34: Repeat step S33 until the magnetic field curve after iteration meets the predetermined requirements.

2. The method according to claim 1, characterized in that, In step S33, adjusting the shape and size of the magnetic field pad includes: Adjust at least one of the following: length, width, and curvature of the magnetic field pad.

3. The method according to claim 1, characterized in that, Step S33 further includes: Determine the error value between the iterated magnetic field curve and the expected magnetic field curve.

4. The method according to claim 3, characterized in that, In step S34, the predetermined requirement includes: the error value is less than or equal to the error threshold.

5. The method according to claim 3, characterized in that, In step S33, By comparing the iterative magnetic field curve with the expected magnetic field curve, the position corresponding to the maximum magnetic induction intensity error between the magnetic field curve and the expected magnetic field curve is determined. The difference between the magnetic induction intensity of the magnetic field curve corresponding to the location and the magnetic induction intensity of the expected magnetic field curve is calculated and used as the error value.

6. The method according to claim 5, characterized in that, In step S32, Establish a three-dimensional coordinate system, where the x-axis is parallel to the connection surface between the magnetic field pad and the electromagnet, the z-axis is perpendicular to the connection surface between the magnetic field pad and the electromagnet, and the magnetic field pad is symmetrical with respect to the plane z=0. Determine the magnetic field intensity components B of the magnetic field curve corresponding to the magnetic field pad in the y-axis and z-axis. y and B z ; In step S33, Calculate B respectively y The first difference between the expected magnetic field curve and the magnetic induction intensity component in the y-axis direction, and the B z The second difference between the expected magnetic field curve and the magnetic induction intensity component in the z-axis direction.

7. The method according to claim 6, characterized in that, In determining the magnetic induction intensity component B y and B z At that time, based on the initial magnetic field strength B0 generated by the electromagnet and the increments b of the magnetic field strength in the y-axis and z-axis directions after setting the magnetic field pad, y b z The B was calculated respectively. y and B z .

8. The method according to claim 1, characterized in that, In step S40, multiple gaskets are spliced ​​together to form the magnetic field pad, and adjacent gaskets are bonded together.

9. The method according to claim 1, characterized in that, In step S40, multiple gaskets are spliced ​​together to form the magnetic field pad, and a fixing member is connected between two adjacent gaskets.

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