A precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer

Abstract

The present invention provides a precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer, which provides a precession magnetic field with high uniformity for the precession of polarized neutrons. The device uses two pairs of Helmholtz coils and an online adjustment mechanism to generate a cylindrical magnetic field; the two pairs of Helmholtz coils are coaxially placed inside and outside, and the currents passing through them are opposite, so that the magnetic field decays rapidly at the edge, reducing the interference of the redundant stray magnetic field on the neutron path; the online adjustment mechanism can adjust the geometric structure of the coil spacing and angle when the neutron beam flow path is opened, and adjust in real time according to the signal results to provide the magnetic field required for the precession of polarized neutrons, and cooperate with the spin echo quasi-bullet neutron scattering spectrometer to greatly improve the energy resolution of neutron scattering, and is used to analyze the dynamic behavior in the range of picoseconds to nanoseconds and angstroms to nanometers in the test material.

Description

Technical Field

[0001] The invention belongs to the technical field of quasi-elastic neutron scattering, and in particular relates to a precession magnetic field generating device for a spin echo quasi-elastic neutron scattering spectrometer. Background Art

[0002] It is used to provide the spin echo quasi-bullet neutron scattering device with the high uniformity precession magnetic field required for the precession of polarized neutrons. It can be used to measure the dynamic behavior of materials in the range of picoseconds to nanoseconds and angstroms to nanometers in material analysis and testing, and to conduct a deeper study of the atomic diffusion and spin motion inside the material, revealing the microscopic mechanism of molecular dynamics, and providing support for the prediction of the structure and performance of the material. The spin echo quasi-bullet neutron scattering spectrometer uses two sets of carefully designed precession magnetic fields to convert the energy change of neutrons when colliding with the sample into the precession information of polarized neutrons in the magnetic field. Therefore, the device used to generate the precession magnetic field is the core component of the entire spectrometer. The performance of this device is directly related to the detection performance of the entire spectrometer, which is specifically reflected in the following two aspects: ① The size of the precession magnetic field determines the measurement range of the spectrometer; ② The uniformity of the precession magnetic field determines the energy resolution of the spectrometer.

[0003] At present, there is no research on the precession magnetic field generation device of the spin echo quasi-bullet neutron scattering spectrometer in China. Therefore, it is urgent to design a precession magnetic field generation device for the spin echo quasi-bullet neutron scattering spectrometer to provide a highly uniform precession magnetic field for the precession of polarized neutrons. Summary of the invention

[0004] To achieve this purpose, a precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer is proposed.

[0005] A precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer, the magnetic field generating device comprises an inner Helmholtz coil pair, an outer Helmholtz coil pair, two coil outer frames, two sets of rotating online adjustment components, two sets of front-rear online adjustment components, two sets of left-right online adjustment components, and two bottom plates; the connection relationship is: the left-right online adjustment components are installed on the top of the bottom plate, the front-rear online adjustment components are installed on the top of the left-right online adjustment components, the rotating online adjustment components are installed on the top of the front-rear online adjustment components, and the coil outer frame is installed on the top of the rotating online adjustment components; the two outer circular current-carrying coils in the outer Helmholtz coil pair are located outside the inner Helmholtz coil pair, the outer circular current-carrying coil in the outer Helmholtz coil pair and the inner circular current-carrying coil in the inner Helmholtz coil pair are respectively fixed in two coil outer frames, the coaxiality of the circular current-carrying coil in the same coil outer frame is ensured by machining, and the coaxiality of the circular current-carrying coils in different coil outer frames is adjusted by the rotating online adjustment components, the front-rear online adjustment components, and the left-right online adjustment components, so as to realize the precession magnetic field structure.

[0006] Optionally, the magnetic field strength generated by the outer Helmholtz coil pair is smaller than the magnetic field strength generated by the inner Helmholtz coil pair, and the magnetic fields generated by the inner Helmholtz coil pair and the outer Helmholtz coil pair are in opposite directions, thereby achieving rapid attenuation of the outer magnetic field of the outer Helmholtz coil pair.

[0007] Optionally, the rotating online adjustment component includes a rotating support top plate, a rotating support pad, a rotating adjustment motor, a rotating slide, a rotating thrust ball bearing, and a rotating support shaft; the connection relationship is: the rotating support top plate is fixed to the top of the rotating support shaft, the rotating support shaft is embedded in the middle of the rotating thrust ball bearing, and the two can rotate therebetween, and the rotating thrust ball bearing is embedded in the top of the front and rear support platforms in the front and rear online adjustment component; a rotating support pad is provided on each side of the rotating support top plate, and the rotating support pad is fixed to the front and rear support top plates; the edge of the rotating support top plate is provided with a first arc-shaped protrusion and a first The groove is provided with a second arc-shaped groove and a second protrusion on the rotating support pad, the protrusion is engaged with the groove, and the protrusion and the groove can slide relative to each other with the rotation of the rotating support top plate; the protrusion and the groove have a certain width along the coil axis direction, limiting the inclination of the coil outer frame so that the inclination is within the permitted range; the rotating slide is located below the rotating support top plate and is fixed to the top of the front and rear support top plates, the rotating adjustment motor is fixed to the rotating slide, and the rotating support shaft is rotated through the transmission mechanism, thereby driving the rotating support top plate and the upper components to rotate, thereby realizing the rotation adjustment function of the device.

[0008] Optionally, the front and rear online adjustment components include a front and rear support top plate, a front and rear adjustment motor, a front and rear bearing assembly, a front and rear limit plate, a front and rear gear assembly, and a front and rear support bottom plate; the connection relationship is: there are 2 groups of front and rear bearing assemblies, the front and rear bearing assemblies include a first slide rail and a first slide sleeve, and are respectively fixed to the bottom surface of the front and rear support top plate and the top surface of the front and rear support bottom plate, and the first slide sleeve can slide along the first slide rail; a front and rear limit plate is provided on each side of the front and rear support top plate, and a protruding snap-fitting portion is provided on the top of the front and rear limit plates, and the snap-fitting portion is snapped with the step portion of the edge of the front and rear support top plate; the snap-fitting portion and the step portion have a certain width along the coil axis direction, which limits the inclination of the upper component and makes the inclination within the permitted range; the gears in the front and rear gear assemblies are fixed to the top surface of the front and rear support bottom plates, and the racks in the front and rear gear assemblies are fixed to the bottom of the front and rear support top plates, and the front and rear adjustment motor drives the gear to drive the rack to realize the front and rear support top plate and the upper component moving forward and backward; a second step portion of a certain width is provided in the middle of the edge of the front and rear support bottom plates.

[0009] Optionally, the left and right online adjustment components include left and right limit blocks, left and right screw rod adjustment components, linear slide rails, left and right adjustment motors, and left and right support base plates; wherein, there are two left and right support base plates, which are fixed to the base plate, and there are two linear slide rails, wherein the linear slide rails are respectively fixed to the top of the two left and right support base plates and the bottom surface of the front and rear support base plates, the left and right screw rod adjustment components are fixed to the base plate and the bottom surface of the front and rear support base plates to ensure that the front and rear support base plates and the upper components and the base plate can move left and right, the left and right adjustment motors are connected to the left and right screw rod adjustment components to push the front and rear support base plates and the upper components to move, thereby realizing the left and right horizontal movement function of the front and rear support base plates and the upper components, the left and right limit blocks are fixedly connected to the left and right support base plates, and a second buckling portion with a width smaller than the second step portion is provided on the top of the left and right limit blocks, and a second buckling portion with a width smaller than the second step portion is buckled with the second step portion to limit the inclination amount of the support base plate and the upper component, so that the inclination amount is within the permitted range, and at the same time limit the left and right maximum displacement of the support base plate and the upper component, and the slide seat of the linear slide rail.

[0010] Optionally, the inner Helmholtz coil pair and the outer Helmholtz coil pair use copper wires or copper strips with high electrical conductivity or high thermal conductivity, or hollow copper wires to allow cooling water to flow through the copper wires.

[0011] Optionally, a layer of potting glue is tightly coated on the outer sides of the inner Helmholtz coil pair and the outer Helmholtz coil pair.

[0012] Optionally, the coil outer frame, the rotating online adjustment component, the front and rear online adjustment component, the left and right online adjustment component, and the bottom plate are all made of non-magnetic materials.

[0013] Optionally, the rotary online adjustment component, the front-rear online adjustment component, and the left-right online adjustment component can all be remotely programmable to ensure that the position of the device can be adjusted online when the neutron beam line is turned on.

[0014] The beneficial effects of the present invention are as follows: (1) The present invention adopts a pair of double Helmholtz coils to achieve a uniform magnetic field in the center area and a rapidly decaying magnetic field at the edge, which is suitable for spin echo quasi-bullet neutron scattering spectrometers and can meet the measurement requirements of molecular dynamics information such as atomic diffusion and spin motion in the internal picosecond to nanosecond and angstrom to nanometer scales of alloys, metal light chemicals, superconducting materials, frustrated magnetic materials, new quantum materials, etc., and provide support for revealing the microscopic mechanism of molecular dynamics and predicting the structure and performance of materials. (2) The present invention realizes safe and convenient three-dimensional (rotation, front and back translation, left and right translation) online adjustment of the coil when the neutron beam line is turned on by setting a three-layer displacement platform and a remote program control device, thereby ensuring the safety and health of the experimenters. (3) The present invention sets a certain width of bite parts, step parts and other structures between the three-layer displacement platforms to limit the tilt of the device when the coil is energized, ensure the coaxiality of the coil, and ensure that the magnetic field meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer of the present invention;

[0016] Figure 2 It is a front view of the precession magnetic field generating device for the spin echo quasi-bullet neutron scattering spectrometer of the present invention;

[0017] Figure 3 Schematic diagram of the structure of the inner Helmholtz coil pair and the outer Helmholtz coil pair;

[0018] Figure 4 It is a schematic diagram of the structure of the coil frame;

[0019] Figure 5 It is a front view of the rotating online adjustment assembly;

[0020] Figure 6 is a cross-sectional view of a rotating online adjustment assembly;

[0021] Figure 7 It is the front view of the front and rear online adjustment components;

[0022] Figure 8 It is a structural schematic diagram of the left and right online adjustment components;

[0023] In the figure, 1. inner Helmholtz coil pair, 2. outer Helmholtz coil pair, 3. coil outer frame, 4. rotating online adjustment component, 5. front and rear online adjustment component, 6. left and right online adjustment component, 7. bottom plate, 8. rotating support top plate, 9. rotating support pad, 10. rotating adjustment motor, 11. rotating slide, 12. rotating thrust ball bearing, 13. rotating support shaft, 14. front and rear support top plate, 15. front and rear adjustment motor, 16. front and rear bearing assembly, 17. front and rear limit plates, 18. front and rear gear assembly, 19. front and rear support bottom plate, 20. left and right limit blocks, 21. left and right screw adjustment assembly, 22. linear slide rail, 23. left and right adjustment motor, 24. left and right support bottom plate;

[0024] 81. First protrusion, 82. First groove, 91. First groove, 92. Second protrusion, 141. Step portion, 161. First slide rail, 162. First slide sleeve, 171. Snap-fit ​​portion, 181. Gear, 182. Rack, 191. Second step portion, 201. Second snap-fit ​​portion. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without any creative labor.

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

[0027] Figure 1-Figure 8 The specific structure of the present invention is shown.

[0028] Example 1

[0029] A precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer, the magnetic field generating device comprising an inner Helmholtz coil pair 1, an outer Helmholtz coil pair 2, two coil outer frames 3, two sets of rotating online adjustment components 4, two sets of front and rear online adjustment components 5, two sets of left and right online adjustment components 6, and two bottom plates 7; the connection relationship is: the left and right online adjustment components 6 are installed on the top of the bottom plate 7, the front and rear online adjustment components 5 are installed on the top of the left and right online adjustment components 6, the rotating online adjustment components 4 are installed on the top of the front and rear online adjustment components 5, and the coil outer frames 3 are installed At the top of the rotating online adjustment component 4; the two outer circular current-carrying coils in the outer Helmholtz coil pair 2 are located on the outside of the inner Helmholtz coil pair 1, and the outer circular current-carrying coils in the outer Helmholtz coil pair 2 and the inner circular current-carrying coil in the inner Helmholtz coil pair 1 are respectively fixed in two coil outer frames 3, and the coaxiality of the circular current-carrying coils in the same coil outer frame 3 is ensured by machining, and the coaxiality of the circular current-carrying coils in different coil outer frames 3 is adjusted by the rotating online adjustment component 4, the front-back online adjustment component 5, and the left-right online adjustment component 6 to realize the precession magnetic field structure.

[0030] Optionally, the magnetic field strength generated by the outer Helmholtz coil pair 2 is smaller than the magnetic field strength generated by the inner Helmholtz coil pair 1, and the magnetic fields generated by the inner Helmholtz coil pair 1 and the outer Helmholtz coil pair 2 are in opposite directions, so that the magnetic field outside the outer Helmholtz coil pair 2 can be rapidly attenuated.

[0031] Optionally, the rotating online adjustment component 4 includes a rotating support top plate 8, a rotating support pad 9, a rotating adjustment motor 10, a rotating slide 11, a rotating thrust ball bearing 12, and a rotating support shaft 13; the connection relationship is: the rotating support top plate 8 is fixed to the top of the rotating support shaft 13, the rotating support shaft 13 is embedded in the middle of the rotating thrust ball bearing 12, and the two can rotate therebetween, and the rotating thrust ball bearing 12 is embedded in the top of the front and rear support platforms 14 in the front and rear online adjustment component 5; a rotating support pad 9 is provided on each side of the rotating support top plate 8, and the rotating support pad 9 is fixed on the front and rear support top plates 14; the edge of the rotating support top plate 8 is provided with an arc-shaped first protrusion 81 and a first groove 82, the A second arc-shaped groove 91 and a second protrusion 92 are provided on the rotating support pad 9, and the protrusion is engaged with the groove, and the protrusion and the groove can slide relative to each other as the rotating support top plate 8 rotates; at the same time, the rotating support top plate 8 is also overlapped on the support pad 9; the protrusion 81 and the groove 91 have a certain width along the coil axis direction, which limits the inclination of the coil outer frame 3 so that the inclination is within the permitted range; the rotating slide 11 is located below the rotating support top plate 8 and is fixed to the top of the front and rear support top plates 14. The rotating adjustment motor 10 is fixed on the rotating slide 11, and the rotating support shaft 13 is rotated through the transmission mechanism, thereby driving the rotating support top plate 8 and the upper components to rotate, thereby realizing the rotation adjustment function of the device.

[0032] Optionally, the front and rear online adjustment assembly 5 includes a front and rear support top plate 14, a front and rear adjustment motor 15, a front and rear bearing assembly 16, a front and rear limit plate 17, a front and rear gear assembly 18, and a front and rear support bottom plate 19; the connection relationship is: there are 2 groups of front and rear bearing assemblies 16, the front and rear bearing assemblies 16 include a first slide rail 161 and a first slide sleeve 162, and are respectively fixed to the bottom surface of the front and rear support top plate 14 and the top surface of the front and rear support bottom plate 19, and the first slide sleeve 162 can slide along the first slide rail 161; a front and rear limit plate 17 is provided on each side of the front and rear support top plate 14, and a protruding buckle 171 is provided on the top of the front and rear limit plate 17. The snap-fitting portion 171 snaps into the step portion 141 on the edge of the front and rear support top plate 14; the snap-fitting portion 171 and the step portion 141 have a certain width along the coil axis direction, limiting the tilt of the upper component so that the tilt is within the permitted range; the gear 181 in the front and rear gear assembly 18 is fixed to the top surface of the front and rear support bottom plate 19, and the rack 182 in the front and rear gear assembly 18 is fixed to the bottom of the front and rear support top plate 14, and the front and rear adjustment motor 15 drives the gear 181 to drive the rack 182 to realize the front and rear support top plate 14 and the upper component moving forward and backward; a second step portion 191 of a certain width is provided in the middle of the edge of the front and rear support bottom plate 19.

[0033] Optionally, the left and right online adjustment components 6 include left and right limit blocks 20, left and right screw adjustment components 21, linear guide rails 22, left and right adjustment motors 23, and left and right support base plates 24; wherein, there are two left and right support base plates 24, which are fixed on the base plate 7, and there are two linear guide rails 22, which are respectively fixed on the top of the two left and right support base plates 24 and the bottom surface of the front and rear support base plates 19, and the left and right screw adjustment components 21 are fixed on the base plate 7 and the bottom surface of the front and rear support base plates 19 to ensure that the front and rear support base plates 19 and the upper components and the base plate 7 can move left and right, and the left and right adjustment motors 23 It is connected to the left and right screw adjustment components 21, pushing the front and rear support base plates 19 and the upper components to move, realizing the left and right horizontal movement function of the front and rear support base plates 19 and the upper components. The left and right limit blocks 20 are fixedly connected to the left and right support base plates 24, and a second buckling portion 201 with a width smaller than the second step portion 191 is provided on the top thereof. The second buckling portion 201 is buckled with the second step portion 191 to limit the inclination of the support base plate 19 and the upper components, so that the inclination is within the permitted range, and at the same time limit the left and right maximum displacement of the support base plate 19 and the upper components, and the sliding seat of the linear slide rail 22.

[0034] Optionally, the inner Helmholtz coil pair 1 and the outer Helmholtz coil pair 2 are made of copper wires or copper strips with high electrical conductivity or high thermal conductivity, or hollow copper wires to allow cooling water to flow through the copper wires.

[0035] Optionally, a layer of potting glue is tightly coated on the outer sides of the inner Helmholtz coil pair 1 and the outer Helmholtz coil pair 2 .

[0036] Optionally, the coil outer frame 3, the rotating online adjustment component 4, the front-rear online adjustment component 5, the left-right online adjustment component 6, and the bottom plate 7 are all made of non-magnetic materials.

[0037] Optionally, the rotary online adjustment component 4, the front-rear online adjustment component 5, and the left-right online adjustment component 6 can all be remotely programmable to ensure that the position of the device can be adjusted online when the neutron beam line is turned on.

[0038] In this embodiment, the inner diameter of the inner Helmholtz coil pair is 100mm, the outer diameter is 238mm, the width is 80mm, the distance between the two coils is 20mm, and the number of turns of a single coil is 288; the inner diameter of the outer Helmholtz coil pair is 220mm, the outer diameter is 292mm, the width is 47mm, the distance between the two coils is 192mm, and the number of turns of a single coil is 63. The outer frame of the coil is made of aluminum alloy, and the outer dimensions of the outer frame of a single coil are 325mm (length) × 138mm (width) × 321mm (height). The overall dimensions of the entire device are 488mm (length) × 296mm (width) × 558mm (height). The coils of the inner and outer Helmholtz coil pairs are wound with copper wires with a cross-sectional area of ​​5 mm×5 mm. After the above implementation, the present invention can generate a magnetic field of >1000 Gs within the range of 30 mm (length)×20 mm (width)×30 mm (height) in the central area of ​​the inner Helmholtz coil pair of the precession magnetic field generating device, and the magnetic field uniformity is better than 0.5%, and the integrated uniformity is 1.91×10 -4 T·m, the magnetic field decays to 10% of the maximum magnetic field at 180mm from the center of the device on the central axis of the coil. For the case without an external Helmholtz coil, this distance needs to be 210mm. The external Helmholtz coil will not affect the integral uniformity of the magnetic field. The tilt of the entire device meets the design requirements.

Claims

1. A precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer, It is characterized in that The magnetic field generating device comprises an inner Helmholtz coil pair (1), an outer Helmholtz coil pair (2), two coil outer frames (3), two sets of rotating online adjustment components (4), two sets of front and rear online adjustment components (5), two sets of left and right online adjustment components (6), and two bottom plates (7); The connection relationship is as follows: the left and right online adjustment components (6) are installed on the top of the bottom plate (7), the front and rear online adjustment components (5) are installed on the top of the left and right online adjustment components (6), the rotating online adjustment components (4) are installed on the top of the front and rear online adjustment components (5), and the coil outer frame (3) is installed on the top of the rotating online adjustment components (4); the two outer circular current-carrying coils in the outer Helmholtz coil pair (2) are located outside the inner Helmholtz coil pair (1), the outer circular current-carrying coils in the outer Helmholtz coil pair (2) and the inner circular current-carrying coils in the inner Helmholtz coil pair (1) are respectively fixed in the two coil outer frames (3), the coaxiality of the circular current-carrying coils in the same coil outer frame (3) is ensured by machining, and the coaxiality of the circular current-carrying coils in different coil outer frames (3) is adjusted by the rotating online adjustment components (4), the front and rear online adjustment components (5), and the left and right online adjustment components (6), so as to realize the precession magnetic field structure; The magnetic field intensity generated by the outer Helmholtz coil pair (2) is smaller than the magnetic field intensity generated by the inner Helmholtz coil pair (1); the magnetic fields generated by the inner Helmholtz coil pair (1) and the outer Helmholtz coil pair (2) are in opposite directions, so that the magnetic field outside the outer Helmholtz coil pair (2) is rapidly attenuated; the inner Helmholtz coil pair (1) and the outer Helmholtz coil pair (2) use copper wires or copper strips with high electrical conductivity or high thermal conductivity, or hollow copper wires to allow cooling water to flow through the copper wires; and the outer sides of the inner Helmholtz coil pair (1) and the outer Helmholtz coil pair (2) are tightly coated with a layer of potting glue.

2. The precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer according to claim 1, It is characterized in that The rotating online adjustment component (4) comprises a rotating support top plate (8), a rotating support pad (9), a rotating adjustment motor (10), a rotating slide (11), a rotating thrust ball bearing (12), and a rotating support shaft (13); the connection relationship thereof is: The rotating support top plate (8) is fixed on the top of the rotating support shaft (13), the rotating support shaft (13) is embedded in the middle of the rotating thrust ball bearing (12), and the two can rotate therebetween, and the rotating thrust ball bearing (12) is embedded in the top of the front and rear support platforms (14) in the front and rear online adjustment components (5); a rotating support pad (9) is provided on each side of the rotating support top plate (8), and the rotating support pad (9) is fixed on the front and rear support top plates (14); the edge of the rotating support top plate (8) is provided with a first arc-shaped protrusion (81) and a first groove (82), and the rotating support pad (9) is provided with a second arc-shaped groove (91) and a first groove (82) Two protrusions (92), the protrusions are engaged with the grooves, and the protrusions and the grooves can slide relative to each other as the rotating support top plate (8) rotates; the protrusions (81) and the grooves (91) have a certain width along the coil axis direction, limiting the inclination of the coil outer frame (3) so that the inclination is within a permitted range; the rotating slide (11) is located below the rotating support top plate (8) and is fixed to the top of the front and rear support top plates (14); the rotating adjustment motor (10) is fixed on the rotating slide (11) and rotates the rotating support shaft (13) through a transmission mechanism, thereby driving the rotating support top plate (8) and the upper components to rotate, thereby realizing the rotation adjustment function of the device.

3. The precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer according to claim 1, It is characterized in that The front and rear online adjustment components (5) include a front and rear support top plate (14), a front and rear adjustment motor (15), a front and rear bearing component (16), a front and rear limit plate (17), a front and rear gear component (18), and a front and rear support bottom plate (19); the connection relationship is: there are two groups of front and rear bearing components (16), the front and rear bearing components (16) include a first slide rail (161) and a first slide sleeve (162), and are respectively fixed to the bottom surface of the front and rear support top plate (14) and the top surface of the front and rear support bottom plate (19), and the first slide sleeve (162) can slide along the first slide rail (161); a front and rear limit plate (17) is provided on each side of the front and rear support top plate (14), and a protruding buckle (171) is provided on the top of the front and rear limit plates (17). The buckling portion (171) buckles with the step portion (141) on the edge of the front and rear support top plates (14); the buckling portion (171) and the step portion (141) have a certain width along the coil axis direction, limiting the tilt of the upper component so that the tilt is within a permitted range; the gear (181) in the front and rear gear components (18) is fixed to the top surface of the front and rear support bottom plates (19), and the rack (182) in the front and rear gear components (18) is fixed to the bottom of the front and rear support top plates (14); the front and rear adjustment motor (15) drives the gear (181) to drive the rack (182) to achieve the front and rear support top plates (14) and the upper components to move forward and backward; a second step portion (191) of a certain width is provided in the middle of the edge of the front and rear support bottom plates (19).

4. The precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer according to claim 1, It is characterized in that The left and right online adjustment components (6) include left and right limit blocks (20), left and right screw rod adjustment components (21), linear guide rails (22), left and right adjustment motors (23), and left and right support base plates (24); wherein, there are two left and right support base plates (24) fixed on the base plate (7); there are two linear guide rails (22), and the linear guide rails (22) are respectively fixed on the top of the two left and right support base plates (24) and the bottom surface of the front and rear support base plates (19); the left and right screw rod adjustment components (21) are fixed on the base plate (7) and the bottom surface of the front and rear support base plates (19) to ensure that the front and rear support base plates (19) and the upper components and the base plate (7) can move left and right; the left and right adjustment motors (23) is connected to the left and right screw rod adjustment components (21), pushing the front and rear support base plates (19) and the upper components to move, thereby realizing the left and right horizontal movement function of the front and rear support base plates (19) and the upper components. The left and right limit blocks (20) are fixedly connected to the left and right support base plates (24), and a second buckling portion (201) with a width smaller than the second step portion (191) is provided on the top thereof. The second buckling portion (201) is buckled with the second step portion (191) to limit the tilting amount of the support base plate (19) and the upper components, so that the tilting amount is within the permitted range, and at the same time, the maximum left and right displacement of the support base plate (19) and the upper components is limited, and the slide seat of the linear slide rail (22) is provided.

5. The precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer according to claim 1, It is characterized in that The coil outer frame (3), the rotating online adjustment component (4), the front and rear online adjustment component (5), the left and right online adjustment component (6), and the bottom plate (7) are all made of non-magnetic materials.

6. The precession magnetic field generating device for a spin echo quasi-bullet neutron scattering spectrometer according to claim 1, It is characterized in that The rotating online adjustment component (4), the front-rear online adjustment component (5), and the left-right online adjustment component (6) can all be remotely programmable, ensuring that the position of the device can be adjusted online when the neutron beam line is turned on.

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