Online magnetic field measurement system and method for linear fusion device

Abstract

The invention discloses an online magnetic field measurement system and method of a linear fusion device, and relates to the technical field of magnetic field measurement of nuclear facilities. The on-line magnetic field measurement system of the linear fusion device comprises a circular track of which the circle center is aligned with the central axis of the magnetic field of the linear fusion device, the circular track is provided with a circular motion part, the circular motion part is connected with a transverse track, the transverse track is provided with a transverse motion part, and the transverse motion part is connected with a longitudinal track. The longitudinal track is provided with a longitudinal moving part which is connected with a magnetic field detector. The circular track and the circular motion piece are matched to enable the magnetic field detector to do circular motion, the transverse track and the transverse motion piece are matched to enable the magnetic field detector to do transverse motion, and the longitudinal track and the longitudinal motion piece are matched to enable the magnetic field detector to move from the outer side to the center in the direction perpendicular to the magnetic field axis of the linear fusion device. Magnetic field measurement of a single probe at any position in the space can be realized, the measurement precision is high, the operability is good, and the measurement efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of magnetic field measurement technology for nuclear facilities, and specifically to an online magnetic field measurement system and method for a linear fusion device. Background Technology

[0002] In the field of magnetic confinement fusion research, field-reversed configuration (FRC) devices have become an important candidate for achieving high-power-density fusion reactions due to their advantages such as compact linear structure and the absence of a central solenoid. In this type of device, multiple sets of quasi-steady-state coils (in the form of solenoids) are the core components for confining the plasma. The magnetic field distribution in their internal space directly determines the plasma confinement effect, thus affecting the operational stability and reaction efficiency of the fusion device.

[0003] To ensure efficient commissioning and optimized operation of the FRC device, it is necessary to acquire real-time online magnetic field distribution data within the quasi-steady-state coil. This data, combined with other physical parameters of the device (such as plasma density and temperature), provides a basis for adjusting coil operating parameters. The current mainstream magnetic field measurement method is "fixed-point Gaussian probe deployment," which involves distributing multiple Gaussian probes within the measurement space according to preset measurement requirements, and acquiring magnetic field data through synchronous acquisition by multiple probes. However, this method has significant drawbacks:

[0004] High equipment cost and high system complexity: In order to cover enough measurement points to reflect the full distribution of the magnetic field, a large number of Gauss probes need to be deployed, which not only increases the hardware procurement cost, but also makes the system wiring cumbersome and increases the difficulty of troubleshooting.

[0005] Poor operational flexibility and low adjustment efficiency: If it is necessary to adjust the measurement points (such as optimizing the measurement point density or changing the measurement area), the old probe must be disassembled and the new probe must be reinstalled while the device is stopped. The whole process is time-consuming and labor-intensive (a single adjustment often takes several hours to several days), which seriously affects the operation and commissioning cycle of the device.

[0006] Therefore, existing technologies need to be improved. Summary of the Invention

[0007] This invention proposes an online magnetic field measurement system and method for a linear fusion device. The system requires only one installation at the initial stage of the overall device installation and does not require frequent adjustments later. Through structural transmission, it can achieve magnetic field measurement of a single probe at any position in space, with high measurement accuracy, good operability, and improved measurement efficiency. It can obtain the spatial distribution data of the magnetic field during the device operation in real time and can quickly optimize the operating parameters of the device coil group.

[0008] This invention is achieved through the following technical solution:

[0009] In a first aspect, the present invention provides an online magnetic field measurement system for a linear fusion device, comprising a circular track whose center is aligned with the central axis of the magnetic field of the linear fusion device. The circular track is equipped with a circumferential moving component, which is connected to a transverse track parallel to the central axis of the magnetic field of the linear fusion device. The transverse track is equipped with a transverse moving component, which is connected to a longitudinal track perpendicular to the central axis of the magnetic field of the linear fusion device. The longitudinal track is equipped with a longitudinal moving component, and the longitudinal moving component is connected to a magnetic field detector.

[0010] The circular track and the circular motion component work together to allow the magnetic field detector to move in a circular motion around the axis of the magnetic field of the linear fusion device. The lateral track and the lateral motion component work together to allow the magnetic field detector to move laterally parallel to the axis of the magnetic field of the linear fusion device. The longitudinal track and the longitudinal motion component work together to allow the magnetic field detector to move from the outside to the center in a direction perpendicular to the axis of the magnetic field of the linear fusion device.

[0011] Furthermore, in this invention, the magnetic field detector described above is configured as a triaxial Hall sensor array, and the magnetic field data at the current position is obtained by fitting the data of the triaxial Hall sensor in real time at any position.

[0012] Furthermore, in this invention, the aforementioned circular track is configured as two, and the two ends of the transverse track are connected to the circumferential moving parts on the two circular tracks, and the two circumferential moving parts move synchronously.

[0013] Furthermore, in this invention, the circular track described above is provided with a track groove inside, an annular rack is provided inside the track groove, the circumferential moving component is provided with a drive gear that meshes with the annular rack, and a stepper motor that is driven and connected to the drive gear is provided inside the circumferential moving component.

[0014] Furthermore, in this invention, the circumferential motion component is provided with a ball on the side away from the annular rack, the circular track is provided with a groove adapted to the ball, the circular track is provided with a through groove on one side of the groove, and the circumferential motion component is provided with a connector extending from the through groove and connecting to the transverse track.

[0015] Furthermore, in this invention, both the aforementioned transverse track and the longitudinal track utilize a lead screw and a slider to achieve linear motion.

[0016] Furthermore, in this invention, the slider described above is provided with a linear positioning mechanism for measuring the moving distance.

[0017] Furthermore, in this invention, the aforementioned circumferential moving component is provided with a circumferential positioning mechanism.

[0018] Furthermore, in this invention, the circular track, the transverse track, and the longitudinal track described above are all made of non-magnetic metal.

[0019] Secondly, the present invention also provides a measurement method, which employs the online magnetic field measurement system of the linear fusion device described above, and further includes the following methods.

[0020] S1: The initial circumferential position of the circumferential moving part on the circular track is calibrated by the circumferential positioning mechanism of the circumferential moving part. At the same time, the initial lateral position of the lateral moving part on the lateral track and the initial longitudinal position of the longitudinal moving part on the longitudinal track are calibrated by the linear positioning mechanism of the slider on the lateral track and the linear moving part on the longitudinal track, respectively, to ensure that the relative position of the initial position of the magnetic field detector and the central axis of the magnetic field of the linear fusion device meets the measurement reference requirements.

[0021] S2: Based on the preset magnetic field measurement area and measurement point distribution, control the circular motion component to move in a circular motion along the circular track, causing the transverse track, longitudinal track, and magnetic field detector to rotate synchronously around the central axis of the magnetic field of the linear fusion device, so as to adjust the circumferential orientation of the magnetic field detector; at the same time, control the transverse motion component to move in a transverse linear motion along the transverse track parallel to the central axis of the magnetic field of the linear fusion device, adjusting the position of the magnetic field detector in the direction parallel to the central axis of the magnetic field; and control the longitudinal motion component to move in a longitudinal linear motion along the longitudinal track perpendicular to the central axis of the magnetic field of the linear fusion device, causing the magnetic field detector to move from the outside of the magnetic field of the linear fusion device towards the center, until the magnetic field detector reaches the target measurement point;

[0022] S3: When the magnetic field detector reaches the target measurement point, the magnetic field detector is activated. If the magnetic field detector is configured as a triaxial Hall sensor array, the magnetic field detection data of each sensor in the triaxial Hall sensor array is collected in real time, and the collected detection data is fitted in real time to obtain the three-dimensional magnetic field data at the target measurement point.

[0023] S4: Repeat steps S2-S3, and through the coordinated movement of the circular motion component, the lateral motion component, and the longitudinal motion component, drive the magnetic field detector to reach all the preset target measurement points in sequence, and complete the full-area magnetic field data acquisition within the magnetic field measurement area of ​​the linear fusion device.

[0024] S5: Integrate the three-dimensional magnetic field data collected and fitted from all target measurement points to form the global distribution data of the magnetic field of the linear fusion device, and output it according to the preset format to realize the online real-time measurement of the magnetic field of the linear fusion device.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1. The online magnetic field measurement system and method of this linear fusion device only requires one magnetic field detector (three-dimensional Hall sensor array). It can achieve full-range measurement through multi-dimensional track transmission, eliminating the need to deploy a large number of Gaussian probes, reducing hardware procurement costs, simplifying system wiring, and reducing the difficulty of troubleshooting.

[0027] 2. If it is necessary to change the measurement area or optimize the distribution of measurement points, the movement trajectory of the magnetic field detector can be controlled simply by modifying the preset parameters through the controller. There is no need to stop the machine to disassemble the equipment. The adjustment time is greatly shortened compared with the traditional solution, which significantly improves the debugging efficiency of the device.

[0028] 3. The track components are made of non-magnetic metal to avoid interference from the magnetic field generated by the track itself. The magnetic field detector uses a three-dimensional Hall sensor array, which eliminates the measurement error of a single sensor through data fitting. The magnetic field data has high accuracy, and the requirements for sensor installation accuracy are reduced, making installation easier. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0030] Figure 1 This is a schematic diagram of the online magnetic field measurement system for a linear fusion device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the installation of the online magnetic field measurement system for a linear fusion device according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the installation of the online magnetic field measurement system for a linear fusion device according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the installation of the online magnetic field measurement system for a linear fusion device according to an embodiment of the present invention.

[0034] The markings and corresponding component names in the attached diagram are as follows: 1-circular track, 101-track groove, 102-rolling groove, 103-through groove, 2-circumferential moving part, 201-drive gear, 202-ball bearing, 203-connector, 3-transverse track, 4-transverse moving part, 5-longitudinal track, 6-longitudinal moving part, 7-magnetic field detector, 8-ring rack. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. The following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0036] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Example 1

[0038] To more clearly demonstrate the technical solution and practical application effect of Embodiment 1 of the present invention, the following describes in detail the online magnetic field measurement system of the linear fusion device of Embodiment 1, taking the magnetic field measurement requirements of a certain field inverse configuration (FRC) linear fusion device as the background.

[0039] Combination Figures 1 to 4 As shown, the online magnetic field measurement system of the linear fusion device in Embodiment 1 of the present invention mainly includes a circular track 1, a circular motion component 2, a transverse track 3, a transverse motion component 4, a longitudinal track 5, a longitudinal motion component 6, and a magnetic field detector 7.

[0040] like Figure 1 and Figure 2 As shown, there are two circular orbitals 1, symmetrically arranged at both ends of the linear fusion device. The centers of both circular orbitals 1 coincide with the central axis of the fusion device's magnetic field (i.e., the central axis of the quasi-steady-state coil), ensuring that the center of the orbital system is aligned with the center of the magnetic field. The circular orbitals 1 are made of non-magnetic metal materials (such as non-magnetic stainless steel or titanium alloy) to avoid interference with the measurement results from the magnetic field generated by the orbitals themselves.

[0041] Combination Figure 3 and Figure 4 As shown, each circular track 1 has a track groove 101 and a rolling groove 102 inside; wherein the track groove 101 is located on the outer circumference inside the circular track 1, and an annular rack 8 is fixedly installed in the groove; the rolling groove 102 is located on the inner circumference inside the circular track 1, and the rolling groove 102 has a smooth rolling surface.

[0042] Furthermore, in combination Figure 3 and Figure 4 As shown, the circular track 1 has a through groove 103 on the side wall with a rolling groove 102. The through groove 103 extends along the circumference of the circular track and its width is adapted to the connecting member 203 of the circumferential moving member 2. It is used to allow the connecting member 203 to pass through and drive the transverse track 3 to move.

[0043] In this embodiment, a circular motion component 2 is configured on each circular track 1, and the circular motion components 2 on the two circular tracks 1 need to maintain synchronous movement (achieved through a synchronization signal from the controller). The structure of the circular motion component 2 includes a drive gear 201, which is mounted on the outside of the circular motion component 2. The drive gear 201 meshes with an annular rack 8 in the track groove 101 of the circular track, and the module of the gear matches that of the rack.

[0044] The circular motion component 2 is also equipped with a stepper motor (not shown). The stepper motor is built into the housing of the circular motion component 2. The output shaft of the stepper motor is connected to the drive gear 201 through a reduction gearbox. The rotation angle of the drive gear 201 can be precisely controlled by controlling the number of pulses of the stepper motor, thereby achieving precise circumferential positioning of the circular motion component 2 along the circular track 1.

[0045] Four balls 202 are installed on the inner side of the circular motion component 2. The balls 202 are embedded in the rolling groove 102 of the circular track 1 and cooperate with the rolling surface in the groove to reduce the frictional resistance when the circular motion component 2 moves, while ensuring the stability of the motion trajectory.

[0046] The circular motion component 2 is also provided with a connector 203. The connector 203 has a rod-shaped structure. One end of the connector 203 is fixedly connected to the housing of the circular motion component 2, and the other end passes through the through groove 103 of the circular track 1 and is connected to the end of the transverse track 3, so as to transmit the circular motion of the circular motion component 2 to the transverse track 3.

[0047] It should be noted that the circumferential positioning mechanism (not shown) can use a photoelectric encoder, which is installed on the output shaft end of the stepper motor (the motor housing uses existing shielding materials to reduce the influence of the magnetic field environment on the motor). The encoder collects the motor rotation angle in real time, and calculates the current circumferential position of the circumferential moving part 2 by combining the transmission ratio of the annular rack 8 and the drive gear 201, so as to achieve precise positioning in the circumferential direction.

[0048] In this embodiment, combined with Figure 1 As shown, the transverse track 3 is a long strip structure made of non-magnetic metal. Its two ends are fixedly connected to the connecting parts 203 of the circular motion components 2 on the two circular tracks 1, respectively. The fixed connection can be made by bolts. The extension direction of the transverse track 3 is parallel to the central axis of the magnetic field of the fusion device, and is used to drive the magnetic field detector 7 to achieve axial (parallel to the magnetic field axis) linear motion.

[0049] The transverse track 3 and the transverse moving component 4 adopt a "lead screw-slider" connection. The transverse track 3 is equipped with a transverse lead screw, one end of which is connected to a transverse drive motor (such as a stepper motor or servo motor). The transverse moving component 4 is located on the outside of the transverse track 3. The transverse moving component 4 is connected to the transverse lead screw through a nut pair, and the inner side of the transverse moving component 4 is equipped with a guide slider (the guide slider cooperates with the guide groove of the transverse track 3) to ensure that the transverse moving component 4 moves linearly along the transverse track 3 without deflection.

[0050] It should be noted that the transverse moving part 4 is equipped with a linear positioning mechanism (not shown). The linear positioning mechanism uses a grating ruler. The main scale of the grating ruler is fixed to the side wall of the transverse track 3, and the reading head is fixed to the transverse moving part 4. The movement distance of the transverse moving part 4 is collected in real time to achieve accurate positioning of the axial position.

[0051] In this embodiment, combined with Figure 1 As shown, the longitudinal track 5 is also made of non-magnetic metal and has a short strip structure (the length of the longitudinal track 5 is adapted to the radial dimension of the fusion device). The top end of the longitudinal track 5 is fixedly connected to the transverse moving part 4, and its extension direction is perpendicular to the central axis of the magnetic field of the fusion device (i.e., extending radially), which is used to drive the magnetic field detector 7 to achieve radial (from the outside to the center or from the center to the outside) linear motion.

[0052] Furthermore, the structure of the longitudinal track 5 is consistent with that of the transverse track 3, both adopting a "lead screw-slider" connection. The longitudinal track 5 is equipped with a longitudinal lead screw, one end of which is connected to a longitudinal drive motor (such as a stepper motor or servo motor). The longitudinal moving part 6 is provided on the outer side of the longitudinal track 5. The longitudinal moving part 6 is connected to the longitudinal lead screw through a nut pair, and a guide slider is provided on the inner side (the guide slider cooperates with the guide groove of the longitudinal track 5) to ensure the stability of radial movement.

[0053] It should be noted that the longitudinal moving part 6 is also equipped with a linear positioning mechanism (not shown). The linear positioning mechanism uses a grating ruler to achieve precise radial positioning.

[0054] In this embodiment, combined with Figure 1As shown, the magnetic field detector 7 is fixedly installed at the end of the longitudinal moving part 6 and is used to collect magnetic field data at the target measurement point. The magnetic field detector 7 adopts a triaxial Hall sensor array (composed of 3-6 high-precision Hall sensors), and the detection direction of each sensor corresponds to the X, Y, and Z axes of the spatial rectangular coordinate system (where the Z axis is parallel to the central axis of the fusion device's magnetic field, the X axis is radial, and the Y axis is along the circumferential tangent direction). By fitting the data collected by each sensor in real time, the three-dimensional magnetic field vector (including magnetic field strength and direction) at the target measurement point can be obtained, avoiding measurement deviations caused by installation errors of a single sensor.

[0055] This system achieves precise movement of the magnetic field detector 7 at any point within the measured space through a three-degree-of-freedom transmission combination of "circular motion + lateral motion + longitudinal motion". The specific motion principle is as follows:

[0056] Circular motion: The controller sends synchronous control signals to the stepper motors of the two circular motion components 2, driving the gear 201 to rotate along the annular rack 8, which in turn drives the circular motion component 2 to perform circular motion along the circular track 1; at the same time, the ball 202 rolls in the groove 102; the circular positioning mechanism (photoelectric encoder) provides real-time feedback of position information to ensure that the circumferential azimuth angle (e.g., 0°-360°) of the magnetic field detector 7 is accurate and controllable.

[0057] Lateral (axial) movement: The controller sends a control signal to the lateral drive motor, which drives the lateral lead screw to rotate. The lateral moving part 4 is driven to move linearly along the lateral track 3 (parallel to the central axis of the magnetic field) through the nut pair. The linear positioning mechanism (grating ruler) provides real-time feedback on the axial position, enabling the magnetic field detector 7 to move precisely in the axial direction.

[0058] Longitudinal (radial) motion: The controller sends a control signal to the longitudinal drive motor, which drives the longitudinal lead screw to rotate. The longitudinal moving part 6 is driven to move linearly along the longitudinal track 5 (perpendicular to the central axis of the magnetic field) through the nut pair. The linear positioning mechanism (grating ruler) provides real-time feedback on the radial position, enabling the magnetic field detector 7 to move accurately from the outside (e.g., R, where R is the radius of the circular track 1) to the center (0 point).

[0059] Through the coordinated control of the above three degrees of freedom motion, the magnetic field detector 7 can reach any point in the space to be measured (the coordinates can be expressed as: circumferential azimuth angle θ, axial position z, and radial position r), thereby realizing the measurement of the magnetic field in the whole domain.

[0060] Example 2

[0061] This embodiment provides a measurement method that uses the online magnetic field measurement system of the linear fusion device in Embodiment 1, and also includes the following methods.

[0062] S1: Initialize positioning

[0063] After the system is started, the controller first controls each moving part to perform initial position calibration:

[0064] Circumferential direction: Control the stepper motors of the two circumferential moving parts 2 to rotate until the circumferential positioning mechanism (photoelectric encoder) detects the preset "zero point mark" (such as the photoelectric switch on the circular track 1), and set the circumferential position at this time as the initial azimuth angle (such as 0°).

[0065] Axial: Control the rotation of the transverse drive motor to move the transverse moving part 4 until the linear positioning mechanism (grating ruler) detects the axial zero point mark and sets the axial position at this time as the initial axial coordinate (e.g., 0mm).

[0066] Radial: Control the longitudinal drive motor to rotate, driving the longitudinal moving part 6 to move until the linear positioning mechanism (grating ruler) detects the radial zero point mark (such as the end point of the longitudinal track 5), and sets the radial position at this time as the initial radial coordinate (such as Rmm, where R is the radius of the circular track 1).

[0067] After calibration, ensure that the initial position of the magnetic field detector 7 and the relative position of the magnetic field center axis of the fusion device meet the measurement reference requirements (e.g., the radial coordinate of the initial position is Rmm, the axial coordinate is 0mm, and the circumferential azimuth angle is 0°).

[0068] S2: Multi-dimensional movement adjustment

[0069] Based on the preset measurement area (e.g., axial range 0-2000mm, radial range 0-500mm, circumferential azimuth 0-360°) and the distribution of measurement points (e.g., axial interval 10mm, radial interval 5mm, circumferential azimuth interval 10°), the controller sends coordinated control signals to each drive motor:

[0070] Circumferential direction: Control the two circular motion components 2 to rotate synchronously, driving the horizontal track 3, the vertical track 5 and the magnetic field detector 7 to rotate around the central axis of the magnetic field, and adjust the magnetic field detector 7 to the target circumferential azimuth angle (e.g., 10°).

[0071] Axial: Control the rotation of the transverse drive motor to drive the transverse moving part 4 to move along the transverse track 3, and adjust the magnetic field detector 7 to the target axial position (e.g., 10mm).

[0072] Radial: Control the rotation of the longitudinal drive motor to drive the longitudinal moving part 6 to move along the longitudinal track 5, and move the magnetic field detector 7 from the outside to the center to the target radial position (e.g., 5mm).

[0073] Through the above three adjustments, the magnetic field detector 7 can accurately reach the first target measurement point.

[0074] S3: Magnetic field data acquisition

[0075] When the magnetic field detector 7 reaches the target measurement point, the controller activates the triaxial Hall sensor array of the magnetic field detector 7 to collect the magnetic field detection data of each sensor in real time (including the magnetic field strength in the X, Y, and Z directions). The controller performs real-time fitting processing on the collected data from multiple sensors (using the least squares method to eliminate the measurement error of a single sensor) to obtain the three-dimensional magnetic field data at the target measurement point (including the total magnetic field strength and magnetic field direction angle), and temporarily stores the data in the system storage module.

[0076] S4: Full-area measurement coverage

[0077] Repeat steps S2-S3: The controller controls the magnetic field detector 7 to move to the next target measurement point in sequence according to the preset measurement point order, and completes the magnetic field data acquisition and fitting at that point; until all preset target measurement points have completed data acquisition, the full-area coverage measurement of the magnetic field area to be measured by the fusion device is realized.

[0078] S5: Data Integration and Output

[0079] After all the data from all measuring points has been collected, the controller integrates and processes all the three-dimensional magnetic field data in the storage module:

[0080] The data is classified and sorted according to the spatial coordinates (θ, z, r) of the measurement points to form a correspondence table between the spatial coordinates and magnetic field data of the magnetic field distribution; visualization charts of the magnetic field distribution (such as three-dimensional magnetic field cloud map, radial magnetic field gradient curve, axial magnetic field distribution curve, etc.) are generated for analysis and use by the operation and commissioning personnel of the fusion device to realize online real-time measurement of the magnetic field.

[0081] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An online magnetic field measurement system for a linear fusion device, characterized in that, The device includes a circular track (1) whose center is aligned with the central axis of the magnetic field of the linear fusion device. The circular track (1) is equipped with a circular motion component (2). The circular motion component (2) is connected to a transverse track (3) that is parallel to the central axis of the magnetic field of the linear fusion device. The transverse track (3) is equipped with a transverse motion component (4). The transverse motion component (4) is connected to a longitudinal track (5) that is perpendicular to the central axis of the magnetic field of the linear fusion device. The longitudinal track (5) is equipped with a longitudinal motion component (6). The longitudinal motion component (6) is connected to a magnetic field detector (7). The circular track (1) and the circular motion component (2) work together to make the magnetic field detector (7) move in a circular motion around the axis of the magnetic field of the linear fusion device. The transverse track (3) and the transverse motion component (4) work together to make the magnetic field detector (7) move in a transverse direction parallel to the axis of the magnetic field of the linear fusion device. The longitudinal track (5) and the longitudinal motion component (6) work together to make the magnetic field detector (7) move from the outside to the center in a direction perpendicular to the axis of the magnetic field of the linear fusion device.

2. The online magnetic field measurement system for a linear fusion device according to claim 1, characterized in that, The magnetic field detector (7) is configured as a triaxial Hall sensor array, and the magnetic field data of the current position is obtained by fitting the data of the triaxial Hall sensor in real time at any position.

3. The online magnetic field measurement system for a linear fusion device according to claim 1, characterized in that, The circular track (1) is configured as two, and the two ends of the transverse track (3) are connected to the circular motion components (2) on the two circular tracks (1), and the two circular motion components (2) move synchronously.

4. The online magnetic field measurement system for a linear fusion device according to claim 1, characterized in that, The circular track (1) has a track groove (101) inside, and an annular rack (8) is provided inside the track groove (101). The circular motion component (2) is provided with a drive gear (201) that meshes with the annular rack (8). The circular motion component (2) is provided with a stepper motor that is connected to the drive gear (201) inside.

5. The online magnetic field measurement system for a linear fusion device according to claim 4, characterized in that, The circular motion component (2) has a ball bearing (202) on the side away from the annular rack (8). The circular track (1) has a groove (102) inside that is adapted to the ball bearing (202). The circular track (1) has a through groove (103) on one side of the groove (102). The circular motion component (2) has a connector (203) extending from the through groove (103) and connecting to the transverse track (3).

6. The online magnetic field measurement system for a linear fusion device according to claim 1, characterized in that, Both the transverse track (3) and the longitudinal track (5) use a lead screw and a slider to achieve linear motion.

7. The online magnetic field measurement system for a linear fusion device according to claim 6, characterized in that, The slider is equipped with a linear positioning mechanism for measuring the moving distance.

8. The online magnetic field measurement system for a linear fusion device according to claim 1, characterized in that, The circular motion component (2) is provided with a circular positioning mechanism.

9. The online magnetic field measurement system for a linear fusion device according to claim 1, characterized in that, The circular track (1), the transverse track (3), and the longitudinal track (5) are all made of non-magnetic metal.

10. A measurement method, characterized in that, The online magnetic field measurement system for a linear fusion device as described in any one of claims 1-9 further includes the following method: S1: The initial circumferential position of the circular motion component (2) on the circular track (1) is calibrated by the circumferential positioning mechanism of the circular motion component (2). At the same time, the initial lateral position of the horizontal motion component (4) on the horizontal track (3) and the initial longitudinal position of the vertical motion component (6) on the vertical track (5) are calibrated by the linear positioning mechanism of the slider on the horizontal track (3) and the vertical track (5) respectively, so as to ensure that the relative position of the initial position of the magnetic field detector (7) and the central axis of the magnetic field of the linear fusion device meets the measurement reference requirements. S2: According to the preset magnetic field measurement area and measurement point distribution, control the circular motion component (2) to make a circular motion along the circular track (1), driving the transverse track (3), the longitudinal track (5) and the magnetic field detector (7) to rotate synchronously around the central axis of the magnetic field of the linear fusion device, so as to adjust the circumferential orientation of the magnetic field detector (7); at the same time, control the transverse motion component (4) to make a transverse linear motion along the transverse track (3) parallel to the central axis of the magnetic field of the linear fusion device, adjusting the position of the magnetic field detector (7) in the direction parallel to the central axis of the magnetic field; and control the longitudinal motion component (6) to make a longitudinal linear motion along the longitudinal track (5) perpendicular to the central axis of the magnetic field of the linear fusion device, driving the magnetic field detector (7) to move from the outside of the magnetic field of the linear fusion device towards the center, until the magnetic field detector (7) reaches the target measurement point; S3: When the magnetic field detector (7) reaches the target measurement point, the magnetic field detector (7) is activated. If the magnetic field detector (7) is configured as a three-dimensional Hall sensor array, the magnetic field detection data of each sensor in the three-dimensional Hall sensor array is collected in real time, and the collected detection data is fitted in real time to obtain the three-dimensional magnetic field data at the target measurement point. S4: Repeat steps S2-S3, and through the coordinated movement of the circular motion component (2), the transverse motion component (4), and the longitudinal motion component (6), drive the magnetic field detector (7) to reach all the preset target measurement points in sequence, and complete the full-domain magnetic field data acquisition within the magnetic field measurement area of ​​the linear fusion device. S5: Integrate the three-dimensional magnetic field data collected and fitted from all target measurement points to form the global distribution data of the magnetic field of the linear fusion device, and output it according to the preset format to realize the online real-time measurement of the magnetic field of the linear fusion device.

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