Magnet structure of high-temperature superconducting undulator

Abstract

The invention discloses a high-temperature superconducting undulator magnet structure, and relates to the technical field of undulators, the high-temperature superconducting undulator magnet structure comprises a coil formed by winding a high-temperature superconducting tape, and the high-temperature superconducting undulator magnet structure comprises a yoke, at least two pieces of end fixed pole iron and a plurality of magnet mounting pieces, the two end part fixed pole iron is arranged on the yoke iron and forms a mounting groove with the yoke iron in a surrounding manner; a plurality of magnet mounting pieces are arranged on the yoke and located in the mounting groove, a winding core body is arranged on one side of each magnet mounting piece in a protruding mode, each winding core body is provided with a first winding section, a winding straight section and a second winding section which are connected, and the width of each winding straight section is smaller than that of each first winding section and that of each second winding section; the end faces of the ends, away from the winding straight section, of the first winding section and the second winding section are cambered surfaces, and the high-temperature superconducting tape is wound around the winding core body to form a coil and is matched with the peripheral wall of the winding core body. The invention aims to enable the high-temperature superconducting tape to better exert performance.

Description

Technical Field

[0001] The present invention relates to the technical field of undulators, and particularly relates to a high-temperature superconducting undulator magnet structure. Background Art

[0002] A superconducting undulator is a key device for large scientific devices such as synchrotron radiation devices, positron-electron colliders, and free-electron laser devices. By generating a strong magnetic field, it causes the electron beam to deflect transversely, thereby generating high-intensity synchrotron radiation light. The coils of traditional undulators are generally wound with NbTi low-temperature superconducting wire. However, with the emergence of high-temperature superconducting material REBCO (rare-earth barium copper oxide), and due to its advantages such as high operating magnetic field strength, high operating temperature, low magnetic energy storage of the magnet, and low maintenance cost, it has gradually been applied to coil manufacturing.

[0003] However, since the bending stress that the REBCO material can withstand is not too large, it is difficult to make it into a cylindrical wire. And making it into a tape form can better utilize its high critical current density and high irreversibility field characteristics, so it is made into a high-temperature superconducting tape. In related technologies, the high-temperature superconducting undulator magnet usually uses a vertical racetrack-shaped wire groove for winding. Although this design can achieve a high magnetic field strength, it also causes the high-temperature superconducting tape used to wind the coil to be subjected to a high vertical magnetic field strength, making the high-temperature superconducting tape unable to better exert its performance. Summary of the Invention

[0004] The main object of the present invention is to propose a high-temperature superconducting undulator magnet structure, aiming to enable the high-temperature superconducting tape to better exert its performance.

[0005] To achieve the above object, the high-temperature superconducting undulator magnet structure proposed by the present invention includes a coil formed by winding a high-temperature superconducting tape, and the high-temperature superconducting undulator magnet structure includes: Yoke iron; At least two end fixing pole pieces, the two end fixing pole pieces are arranged on the yoke iron and enclose an installation groove with the yoke iron; and A plurality of magnet mounting members, the plurality of magnet mounting members are arranged on the yoke iron and are located in the installation groove. One side of each magnet mounting member protrudes with a winding core body. The winding core body has a first winding segment, a winding straight segment, and a second winding segment connected to each other. The width of the winding straight segment is smaller than the widths of the first winding segment and the second winding segment. The end faces of the first winding segment and the second winding segment away from the winding straight segment are arc surfaces. The high-temperature superconducting tape is wound around the winding core body to form the coil and is adapted to the outer peripheral wall of the winding core body.

[0006] In one embodiment, each of the magnet mountings includes a main pole iron and a secondary pole iron. A winding core body protrudes from one side of the main pole iron, and a limiting step is formed at the connection between the main pole iron and the winding core body. A secondary pole iron is provided between any two adjacent main pole irons. Grooves are formed on two opposite side walls of the main pole iron corresponding to the straight winding segments, and first convex segments are formed on two opposite side walls of the secondary pole iron corresponding to the grooves. A second convex segment is formed at one end of each end fixing pole iron close to the main pole iron corresponding to the groove.

[0007] In one embodiment, arc transition concave segments are formed at the connections between the first winding segment and the straight winding segment and between the second winding segment and the straight winding segment. The arc transition concave segment includes a first arc segment and a second arc segment connected to each other.

[0008] In one embodiment, arc transition concave segments are formed on two side walls of the groove, and arc transition convex segments adapted to the arc transition concave segments are formed at both ends of the first convex segment and the second convex segment.

[0009] In one embodiment, the end of the first winding segment extends in a direction away from the straight winding segment to form an arc inclined surface segment, and an inlet channel is formed on one side wall of the main pole iron corresponding to the arc inclined surface segment.

[0010] In one embodiment, a first connecting portion is formed at one end of the main pole iron close to the first winding segment. Each of the magnet mountings includes a commutator, the commutator is detachably connected to the first connecting portion, and an inclined surface concave arc groove adapted to the arc inclined surface segment is formed at the end of the commutator.

[0011] In one embodiment, a third winding segment protrudes from one side of the commutator facing away from the yoke iron. One side wall of the third winding segment close to the first winding segment is a concave arc surface adapted to the arc inclined surface segment, and the other side wall of the third winding segment away from the first winding segment is an arc surface, so that the third winding segment is adapted to be connected to the first winding segment.

[0012] In one embodiment, the side wall of one end of the second winding segment away from the straight winding segment is a vertical surface. Each of the magnet mountings includes an adjusting member, the adjusting member is elastically connected to the main pole iron, a fourth winding segment protrudes from one side of the adjusting member facing away from the yoke iron, one side wall of the fourth winding segment close to the second winding segment is a vertical surface, and the other side wall of the fourth winding segment away from the second winding segment is an arc surface, so that the fourth winding segment is adapted to be connected to the second winding segment.

[0013] In one embodiment, each of the magnet mountings includes an elastic member. A first receiving groove is formed in an end face of the main pole iron close to the adjusting member, and a second receiving groove is formed in an end face of the adjusting member close to the main pole iron. The first receiving groove communicates with the second receiving groove, and two ends of the elastic member are respectively connected to a bottom wall of the first receiving groove and a bottom wall of the second receiving groove.

[0014] In one embodiment, a second connecting portion is formed at one end of the main pole iron close to the second winding segment. Each of the magnet mountings includes a fastener. A strip-shaped hole is formed in the second connecting portion and is arranged along an extending direction of the main pole iron. An installation hole is formed in the adjusting member, and the fastener passes through the installation hole and the strip-shaped hole to connect the main pole iron and the adjusting member.

[0015] In the technical solution of the present invention, the high-temperature superconducting tape is periodically wound around the outer peripheral wall of the winding core to form a horizontal barbell-shaped coil with wide ends and a narrow middle, so that the coil is horizontally wound, which can effectively reduce the vertical magnetic field component received by the high-temperature superconducting tape. An excessively high vertical magnetic field will reduce the performance of the high-temperature superconducting tape, while horizontal winding can optimize the magnetic field direction to be closer to the critical current direction of the tape, thereby improving the current-carrying capacity of the tape and further enabling the high-temperature superconducting tape to better exert its performance; since the width of the winding core determines the period length of the magnetic field generated by the coil, and in order to meet the requirement of the undulator to generate a short-period magnetic field, and the minimum turning diameter of the REBCO high-temperature superconducting tape is relatively large, the winding core needs to be set in a shape with wide ends and a narrow middle to adapt to the performance of the high-temperature superconducting tape and meet the requirement of the undulator to generate a magnetic field; due to the relatively large minimum turning diameter of the REBCO high-temperature superconducting tape, the end faces of the first winding segment and the second winding segment away from the winding straight segment are set as arc surfaces to adapt to the physical characteristics of the REBCO high-temperature superconducting tape and reduce the stress and damage of the tape during the winding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the high-temperature superconducting undulator magnet structure provided by the present invention; Figure 2 It is an exploded structural diagram of an embodiment of the high-temperature superconducting undulator magnet structure provided by the present invention; Figure 3 It is a schematic structural diagram of an embodiment of the adjusting member provided by the present invention; Figure 4 Schematic structural diagram of an embodiment of the commutation member provided by the present invention; Figure 5 Schematic structural diagram of an embodiment of the end-fixed pole iron provided by the present invention; Figure 6 Schematic structural diagram of an embodiment of the main pole iron provided by the present invention; Figure 7 Schematic structural diagram of an embodiment of the auxiliary pole iron provided by the present invention.

[0018] Explanation of the reference numerals in the drawings: 100, high-temperature superconducting undulator magnet structure; 1, yoke iron; 11, limiting convex part; 2, end-fixed pole iron; 21, mounting groove; 22, second convex section; 3, magnet mounting member; 31, main pole iron; 311, winding core; 311a, first winding section; 311b, winding straight section; 311c, second winding section; 311d, arc transition concave section; 311e, arc inclined plane section; 312, groove; 313, wire inlet channel; 314, first connecting part; 315, first accommodating groove; 316, second connecting part; 316a, strip-shaped hole; 317, limiting groove; 32, auxiliary pole iron; 321, first convex section; 321a, arc transition convex section; 33, limiting step; 34, commutation member; 341, inclined plane concave arc groove; 342, third winding section; 35, adjusting member; 351, fourth winding section; 352, second accommodating groove; 353, mounting hole; 36, elastic member; 4, coil.

[0019] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0021] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] The present invention provides a high-temperature superconducting undulator magnet structure 100.

[0024] Please refer to Figure 1 and Figure 2 In an embodiment of the present invention, the high-temperature superconducting undulator magnet structure 100 includes a coil 4 formed by winding a high-temperature superconducting tape. The high-temperature superconducting undulator magnet structure 100 includes a yoke 1, at least two end fixing pole pieces 2, and a plurality of magnet mounting members 3. The two end fixing pole pieces 2 are provided on the yoke 1 and enclose an installation groove 21 with the yoke 1. A plurality of the magnet mounting members 3 are provided on the yoke 1 and are located in the installation groove 21. A winding core 311 protrudes from one side of each of the magnet mounting members 3. The winding core 311 has a first winding segment 311a, a winding straight segment 311b, and a second winding segment 311c that are connected to each other. The width of the winding straight segment 311b is smaller than the widths of the first winding segment 311a and the second winding segment 311c. The end faces of the first winding segment 311a and the second winding segment 311c away from the winding straight segment 311b are arc surfaces. The high-temperature superconducting tape is wound around the winding core 311 to form the coil 4 and is adapted to the outer peripheral wall of the winding core 311.

[0025] In the technical solution of the present invention, the high-temperature superconducting tape is wound around the outer peripheral wall of the winding core 311 periodically to form a horizontal barbell-shaped coil 4 with wide ends and a narrow middle, so that the coil 4 is wound horizontally, which can effectively reduce the vertical magnetic field component received by the high-temperature superconducting tape. An excessively high vertical magnetic field will reduce the performance of the high-temperature superconducting tape, while horizontal winding can optimize the magnetic field direction to be closer to the critical current direction of the tape, thereby improving the current-carrying capacity of the tape, and further enabling the high-temperature superconducting tape to better exert its performance; since the width of the winding core 311 determines the period length of the magnetic field generated by the coil 4, and in order to meet the requirement of the undulator to generate a short-period magnetic field, and the minimum turning diameter of the REBCO high-temperature superconducting tape is relatively large, the winding core 311 needs to be set in a shape with wide ends and a narrow middle to adapt to the performance of the high-temperature superconducting tape and meet the requirement of the undulator to generate a magnetic field; due to the relatively large minimum turning diameter of the REBCO high-temperature superconducting tape, the end faces of the first winding segment 311a and the second winding segment 311c far from the winding straight segment 311b are set as arc surfaces to adapt to the physical characteristics of the REBCO high-temperature superconducting tape and reduce the stress and damage of the tape during winding; at the same time, since the coil 4 in this solution is wound horizontally, compared with vertical winding, the amount of high-temperature superconducting tape used is reduced, thereby reducing the cost, and the number of coils 4 is smaller, reducing the energy storage of the magnet, which is more conducive to quench protection.

[0026] Among them, the yoke 1 is an important part of the high-temperature superconducting undulator magnet structure 100, and its main function is to provide mechanical support and magnetic circuit closure. The yoke 1 can guide and concentrate the magnetic field, reduce magnetic leakage, and ensure that the magnetic field is mainly concentrated in the area where the electron beam passes, thereby improving the uniformity and stability of the magnetic field; the end fixing pole iron 2 is located at both ends of the magnet and is mainly used to fix and support the magnet structure. It can ensure the mechanical stability of the magnet structure during operation and prevent the magnet structure from deforming due to vibration or other external forces; the magnet mounting member 3 is used to generate a periodic magnetic field and improve the uniformity and stability of the magnetic field; the width of the winding straight segment 311b is set in the range of 1 mm to 10 mm, preferably set to 5 mm. The end faces of the first winding segment 311a and the second winding segment 311c far from the winding straight segment 311b are arc surfaces, and the radius of the arc surface is set in the range of 1 mm to 10 mm, preferably set to 5 mm. The optimized winding straight segment 311b and the arc surface can improve the periodicity and uniformity of the magnetic field.

[0027] To wind the coil 4 into a shape with wide ends and a narrow middle, please refer to Figure 1 、 Figure 2 and Figures 5 to 7, in an embodiment of the present invention, each of the magnet mounting members 3 includes a main pole iron 31 and a secondary pole iron 32. A winding core 311 protrudes from one side of the main pole iron 31, and a limiting step 33 is formed at the connection between the main pole iron 31 and the winding core 311. One secondary pole iron 32 is provided between any two adjacent main pole irons 31; grooves 312 are formed on opposite side walls of the main pole iron 31 corresponding to the straight winding section 311b, and first convex segments 321 are formed on opposite side walls of the secondary pole iron 32 corresponding to the grooves 312; a second convex segment 22 is formed at one end of each end fixing pole iron 2 close to the main pole iron 31 corresponding to the groove 312. First, the high-temperature superconducting tape is periodically wound around the outer peripheral wall of the winding core 311, and the winding is stopped after the winding width of the high-temperature superconducting tape reaches the width of the limiting step 33. Then, the two secondary pole irons 32 are connected to the side walls of the main pole iron 31, so that the first convex segments 321 of the secondary pole irons 32 and the winding core 311 of the main pole iron 31 cooperate to press the middle part of the coil 4, forming a horizontal barbell-shaped coil 4 with wide ends and a narrow middle. After repeating the winding of multiple coils 4, one end fixing pole iron 2 is installed on the yoke iron 1, and the secondary pole iron 32 on one side of the main pole iron 31 in the wound coil 4 structure is removed. Then, the main pole iron 31 is connected to the end fixing pole iron 2. Next, the secondary pole iron 32 on one side of the main pole iron 31 in the next wound coil 4 structure is removed, and the main pole iron 31 is connected to the secondary pole iron 32 in the previously fixed coil 4 structure. Until all the wound coil 4 structures are installed, then another end fixing pole iron 2 is installed on the yoke iron 1, so that the second convex segment 22 of the end fixing pole iron 2 cooperates with the groove 312 of the main pole iron 31 to complete the installation of the high-temperature superconducting undulator magnet structure 100. The magnet mounting member 3 includes a main pole iron 31 and a secondary pole iron 32, which jointly act on the generation and optimization of the magnetic field. The main pole iron 31 is used to generate a periodic magnetic field, while the secondary pole iron 32 is used to assist in adjusting the magnetic field distribution and optimizing the uniformity and stability of the magnetic field; the limiting step 33 is located at the connection between the main pole iron 31 and the winding core 311, and is used to limit the winding width of the high-temperature superconducting tape, ensuring that the tape remains in a predetermined position during the winding process. The width of the limiting step 33 can be selected and set within the range of 1 mm to 10 mm according to actual requirements, and is preferably set to 3 mm; the settings of the first convex segment 321, the second convex segment 22, and the groove 312 are used to cooperate to press the coil 4 into a shape with wide ends and a narrow middle, so that the wound coil 4 adapts to the performance of the high-temperature superconducting tape and meets the requirements of the undulator for generating a magnetic field.

[0028] Specifically, please refer to Figure 6, in an embodiment of the present invention, arc transition concave segments 311d are formed at the joints of the first winding segment 311a and the winding straight segment 311b and at the joints of the second winding segment 311c and the winding straight segment 311b; the arc transition concave segment 311d includes a connected first arc segment and second arc segment. During the winding process of the high-temperature superconducting tape, stress concentration is likely to occur at the joints, and stress concentration may cause damage to the tape during the winding process, affecting its performance. The arc transition concave segment 311d reduces stress concentration through a smooth transition design, reduces the risk of damage to the tape during the winding process, and improves the service life and reliability of the tape; the uniformity and stability of the magnetic field are crucial for the performance of the undulator. The shape of the winding core 311 directly affects the distribution of the magnetic field. The design of the arc transition concave segment 311d makes the magnetic field more uniform at the joints, reduces the non-uniformity of the magnetic field, and helps to improve the stability and uniformity of the magnetic field, thereby improving the performance of the undulator; the minimum turning diameter of the REBCO high-temperature superconducting tape is relatively large, and it is necessary to reduce the stress and damage of the tape during the winding process. The design of the arc transition concave segment 311d adapts to the physical characteristics of the REBCO high-temperature superconducting tape, reduces the stress of the tape during the winding process, ensures that the tape will not be damaged during the winding process, and improves the current-carrying capacity of the tape.

[0029] In an embodiment, the first arc segment and the second arc segment are arranged in a common tangent, and the radius setting range of the first arc segment and the second arc segment is between 2 mm and 50 mm, preferably set to 20 mm. Through the common tangent setting and optimized radius, the magnetic field is more uniform at the joints, reducing the non-uniformity and boundary effect of the magnetic field, and improving the stability and uniformity of the magnetic field; the larger radius reduces stress concentration, reduces the risk of damage to the tape during the winding process, and improves the service life and reliability of the tape; through the optimized radius setting, the tape is more smooth during the winding process, reducing the error during the winding process, improving the winding accuracy, and thus improving the uniformity and stability of the magnetic field; the optimized radius setting adapts to the physical characteristics of the REBCO high-temperature superconducting tape, reduces the stress of the tape during the winding process, ensures that the tape will not be damaged during the winding process, and improves the current-carrying capacity of the tape.

[0030] Further, please refer to Figure 6, in an embodiment of the present invention, arc transition concave segments 311d are formed on both side walls of the groove 312, and arc transition convex segments 321a adapted to the arc transition concave segments 311d are formed at both ends of the first convex segment 321 and the second convex segment 22. The arc transition concave segment 311d and the arc transition convex segment 321a cooperate to ensure that the first convex segment 321 and the second convex segment 22 can be tightly connected to the groove 312 respectively, so as to cooperate to press the coil 4 to form a shape with wide ends and narrow middle. The arc transition convex segment 321a also has a first arc segment and a second arc segment, which are adapted to the shape of the arc transition concave segment 311d to improve the stability and uniformity of the magnetic field generated by the coil 4 structure formed by winding.

[0031] Please refer to Figure 6 , in an embodiment of the present invention, the end of the first winding segment 311a extends in a direction away from the winding straight segment 311b to form an arc inclined surface segment 311e, and an inlet channel 313 is provided on a side wall of the main pole iron 31 corresponding to the arc inclined surface segment 311e. The high-temperature superconducting tape can enter from the inlet channel 313 and enter the first winding segment 311a under the guiding action of the turning of the arc inclined surface segment 311e, so as to be periodically wound around the outer peripheral wall of the winding core 311 to form a horizontal barbell-shaped coil 4 with wide ends and narrow middle. During the winding process, the high-temperature superconducting tape needs to enter the winding core 311 from a specific inlet. The inlet channel 313 provides a clear inlet for the tape, ensuring that the tape can smoothly enter the winding core 311. The design of the arc inclined surface segment 311e can smoothly guide the turning of the tape, ensuring that the tape can smoothly enter the first winding segment 311a, providing a smooth transition surface for the high-temperature superconducting tape, reducing the stress concentration during the turning of the tape, and reducing the risk of damage to the tape during the winding process; the design of the arc inclined surface segment 311e makes the magnetic field more uniform at the connection, reducing the magnetic field non-uniformity and boundary effect, and improving the stability and uniformity of the magnetic field.

[0032] Furthermore, please refer to Figure 4 and Figure 6, in an embodiment of the present invention, a first connecting portion 314 is formed at one end of the main pole iron 31 close to the first winding segment 311a. Each of the magnet mounting members 3 includes a commutation member 34, and the commutation member 34 is detachably connected to the first connecting portion 314. An inclined surface concave arc groove 341 adapted to the arc inclined surface segment 311e is formed at the end of the commutation member 34. When performing the winding operation of the high-temperature superconducting tape, first, the high-temperature superconducting tape enters from the incoming wire channel 313 and enters the first winding segment 311a under the guiding action of the turning of the arc inclined surface segment 311e. At this time, the commutation member 34 needs to be connected to the first connecting portion 314 so that the bottom wall of the inclined surface concave arc groove 341 cooperates with the outer peripheral wall of the arc inclined surface segment 311e to fix the end of the high-temperature superconducting tape. After fixing the end of the high-temperature superconducting tape, the high-temperature superconducting tape is periodically wound along the outer peripheral wall of the winding core 311 to form a horizontal barbell-shaped coil 4 with wide ends and a narrow middle; the detachable connection between the commutation member 34 and the first connecting portion 314 can be achieved by screwing a screw through the first connecting portion 314 and the commutation member 34, or by providing a snap structure on the first connecting portion 314 and the commutation member 34. In this embodiment, screw connection is preferably adopted, and the screw can be tightened or loosened as needed to improve the connection reliability between the first connecting portion 314 and the commutation member 34, ensure the firm fixation of the end of the high-temperature superconducting tape, and reduce the error during the winding process.

[0033] Please refer to Figure 4 and Figure 6 , in an embodiment of the present invention, a third winding segment 342 protrudes from the side of the commutation member 34 facing away from the yoke iron 1. One side wall of the third winding segment 342 close to the first winding segment 311a is a concave arc surface adapted to the arc inclined surface segment 311e, and the side wall of the third winding segment 342 far from the first winding segment 311a is an arc surface, so that the third winding segment 342 is adapted to be connected to the first winding segment 311a. When performing the winding operation of the high-temperature superconducting tape, first, the high-temperature superconducting tape enters from the incoming wire channel 313 and enters the first winding segment 311a under the guiding action of the turning of the arc inclined surface segment 311e. At this time, the commutation member 34 needs to be connected to the first connecting portion 314 so that both the bottom wall of the inclined surface concave arc groove 341 and the concave arc surface cooperate with the outer peripheral wall of the arc inclined surface segment 311e to fix the end of the high-temperature superconducting tape. After fixing the end of the high-temperature superconducting tape, the high-temperature superconducting tape is periodically wound along the first winding segment 311a, the winding straight segment 311b, the second winding segment 311c, and the third winding segment 342 in sequence to form a horizontal barbell-shaped coil 4 with wide ends and a narrow middle; the radius of the arc surface of the third winding segment 342 is set in the range of 1 mm to 10 mm, and is preferably set to 5 mm.

[0034] Please refer to Figure 2 , Figure 3 and Figure 6, in an embodiment of the present invention, the side wall of one end of the second winding segment 311c away from the winding straight segment 311b is a vertical plane. Each of the magnet mounting members 3 includes an adjusting member 35, and the adjusting member 35 is elastically connected to the main pole iron 31. A fourth winding segment 351 protrudes from the side of the adjusting member 35 facing away from the yoke iron 1. One side wall of the fourth winding segment 351 close to the second winding segment 311c is a vertical plane, and the side wall of the fourth winding segment 351 away from the second winding segment 311c is an arc surface, so that the fourth winding segment 351 is adaptively connected to the second winding segment 311c. When performing the winding operation of the high-temperature superconducting tape, first, the high-temperature superconducting tape enters from the inlet channel 313 and enters the first winding segment 311a under the guiding action of the turning of the arc-shaped inclined plane segment 311e. At this time, the commutation member 34 needs to be connected to the first connecting portion 314 so that the bottom wall and the concave arc surface of the inclined plane concave arc groove 341 cooperate with the outer peripheral wall of the arc-shaped inclined plane segment 311e to fix the end of the high-temperature superconducting tape. After the end of the high-temperature superconducting tape is fixed, the high-temperature superconducting tape is sequentially wound around the first winding segment 311a, the winding straight segment 311b, the second winding segment 311c, the fourth winding segment 351, and the third winding segment 342 periodically to form a horizontal barbell-shaped coil 4 with a wide end and a narrow middle; since the adjusting member 35 is elastically connected to the main pole iron 31, there is a gap between the main pole iron 31 and the adjusting member 35. After the winding width of the high-temperature superconducting tape reaches the target width, the coil 4 at the winding straight segment 311b will not be in close contact with the winding straight segment 311b. After connecting the two sub-pole irons 32 to both sides of the main pole iron 31 respectively, at this time, the coil 4 at the winding straight segment 311b is pressed by the sub-pole iron 32 and the main pole iron 31 to fit the winding straight segment 311b. At the same time, under the action of this pressing force, the gap between the main pole iron 31 and the adjusting member 35 decreases, and the vertical plane of the fourth winding segment 351 and the vertical plane of the second winding segment 311c are in close contact to complete the winding of the coil 4; the side wall of the fourth winding segment 351 away from the second winding segment 311c is an arc surface, and the radius of the arc surface is set in the range of 1 mm to 10 mm, preferably set to 5 mm; the present invention does not limit the materials of the commutation member 34 and the adjusting member 35, and preferably uses high thermal conductivity materials at low temperatures, such as oxygen-free copper or aluminum and other materials.

[0035] Please refer to Figure 2 and Figure 3, in an embodiment of the present invention, each of the magnet mounting members 3 includes an elastic member 36. An end face of the main pole iron 31 close to the adjusting member 35 is provided with a first receiving groove 315, and an end face of the adjusting member 35 close to the main pole iron 31 is provided with a second receiving groove 352. The first receiving groove 315 communicates with the second receiving groove 352. Two ends of the elastic member 36 are respectively connected to the bottom wall of the first receiving groove 315 and the bottom wall of the second receiving groove 352. The two ends of the elastic member 36 are respectively connected to the bottom wall of the first receiving groove 315 and the bottom wall of the second receiving groove 352, so as to form an elastic connection between the adjusting member 35 and the main pole iron 31. This elastic connection method allows the adjusting member 35 to undergo a certain amount of elastic deformation when subjected to an external force, so as to better meet the winding requirements of the high-temperature superconducting tape when winding the coil 4; the elastic member 36 is connected to the bottom walls of the two receiving grooves, so that when the vertical plane of the fourth winding segment 351 and the vertical plane of the second winding segment 311c are closely attached, the elastic member 36 can be compressed and accommodated in the first receiving groove 315 and the second receiving groove 352, thereby minimizing the gap between the main pole iron 31 and the adjusting member 35 as much as possible. At the same time, the vertical plane of the fourth winding segment 351 can be adapted to the shape of the vertical plane of the second winding segment 311c, so that the vertical plane of the fourth winding segment 351 can be closely attached to the vertical plane of the second winding segment 311c.

[0036] Furthermore, please refer to Figure 4 and Figure 6, in an embodiment of the present invention, a second connecting portion 316 is formed at one end of the main pole iron 31 close to the second winding segment 311c. Each of the magnet mounting members 3 includes a fastener. The second connecting portion 316 is provided with a strip-shaped hole 316a arranged along the extending direction of the main pole iron 31. The adjusting member 35 is provided with a mounting hole 353. The fastener passes through the mounting hole 353 and the strip-shaped hole 316a to connect the main pole iron 31 and the adjusting member 35. When performing the winding operation of the high-temperature superconducting tape, first, the high-temperature superconducting tape enters from the inlet channel 313 and enters the first winding segment 311a under the guiding action of the turning of the arc-shaped inclined surface segment 311e. At this time, the commutation member 34 needs to be connected to the first connecting portion 314 so that the bottom wall and the concave arc surface of the inclined surface concave arc groove 341 cooperate with the outer peripheral wall of the arc-shaped inclined surface segment 311e to fix the end of the high-temperature superconducting tape. Then, the fastener passes through the strip-shaped hole 316a and the mounting hole 353 to connect the adjusting member 35 and the main pole iron 31. After the end of the high-temperature superconducting tape is fixed, the high-temperature superconducting tape is sequentially wound around the first winding segment 311a, the winding straight segment 311b, the second winding segment 311c, the fourth winding segment 351, and the third winding segment 342 periodically to form a horizontal barbell-shaped coil 4 with wide ends and a narrow middle; since the adjusting member 35 and the main pole iron 31 are elastically connected, there is a gap between the main pole iron 31 and the adjusting member 35. After the winding width of the high-temperature superconducting tape reaches the target width, the coil 4 at the winding straight segment 311b will not be in close contact with the winding straight segment 311b. After the two sub-pole irons 32 are respectively connected to both sides of the main pole iron 31, at this time, the coil 4 at the winding straight segment 311b is pressed by the sub-pole iron 32 and the main pole iron 31 to fit the winding straight segment 311b. At the same time, under the action of this pressing force, the gap between the main pole iron 31 and the adjusting member 35 decreases. Therefore, the strip-shaped hole 316a and the mounting hole 353 are provided here. The setting of the strip-shaped hole 316a allows the adjusting member 35 to move closer to the main pole iron 31 under the action of the pressing force, so that the vertical surface of the fourth winding segment 351 and the vertical surface of the second winding segment 311c are in close contact, completing the winding of the coil 4.

[0037] Please refer to Figure 4 and Figure 6 , in an embodiment, a limiting groove 317 is formed on one side of each main pole iron 31 facing the yoke iron 1, and the yoke iron 1 forms a limiting convex portion 11. A partial structure of the limiting convex portion 11 is received and limited in the limiting groove 317. The setting of the limiting convex portion 11 and the limiting groove 317 enables the main pole iron 31 and the yoke iron 1 to be limited when connected, which can effectively prevent the main pole iron 31 and the yoke iron 1 from having lateral or longitudinal displacements during the connection process. This limiting design ensures the relative position fixation between the two, thereby improving the structural stability of the entire device.

[0038] The specific winding method of the magnet structure of the high-temperature superconducting undulator proposed in this solution is as follows: The high-temperature superconducting tape enters from the inlet channel 313 and enters the first winding segment 311a under the guiding action of the turning of the arc inclined surface segment 311e. At this time, the commutator 34 needs to be connected to the first connecting portion 314 (both the commutator 34 and the first connecting portion 314 are provided with threaded holes, and a bolt can be used to pass through the threaded holes of the commutator 34 and the first connecting portion 314) so that the bottom wall and the concave arc surface of the inclined surface concave arc groove 341 cooperate with the outer peripheral wall of the arc inclined surface segment 311e to fix the end of the high-temperature superconducting tape; both ends of the elastic member 36 are respectively bonded to the bottom wall of the first receiving groove 315 and the bottom wall of the second receiving groove 352, and then the fastener passes through the strip-shaped hole 316a and the mounting hole 353 to connect the adjusting member 35 to the main pole iron 31; the high-temperature superconducting tape is sequentially wound periodically along the first winding segment 311a, the winding straight segment 311b, the second winding segment 311c, the fourth winding segment 351, and the third winding segment 342 until the winding width of the high-temperature superconducting tape reaches the target width (the width of the limiting step 33), and then the winding stops; the two sub-pole irons 32 are connected to both sides of the main pole iron 31 (both the sub-pole iron 32 and the main pole iron 31 are provided with threaded holes, and a bolt can be used to pass through the threaded holes of the sub-pole iron 32 and the main pole iron 31). At this time, the coil 4 located at the winding straight segment 311b is pressed and fitted to the winding straight segment 311b by the sub-pole iron 32 and the main pole iron 31. Under the action of this pressing force, the elastic member 36 retracts, and the gap between the main pole iron 31 and the adjusting member 35 decreases, so that the vertical surfaces of the fourth winding segment 351 and the second winding segment 311c are closely fitted, completing the winding of the coil 4, and repeating this operation to wind multiple coils 4; one end fixing pole iron 2 is installed on the yoke iron 1, and the sub-pole iron 32 on one side of the main pole iron 31 in the wound coil 4 structure is removed, and then the main pole iron 31 is connected to the end fixing pole iron 2. Then, the sub-pole iron 32 on one side of the main pole iron 31 in the next wound coil 4 structure is removed, and the main pole iron 31 is connected to the sub-pole iron 32 in the previously fixed coil 4 structure. Repeat this operation until all the wound coil 4 structures are installed, and then the other end fixing pole iron 2 is installed on the yoke iron 1 so that the second convex segment 22 of the end fixing pole iron 2 cooperates with the groove 312 of the main pole iron 31 to complete the installation of the magnet structure 100 of the high-temperature superconducting undulator.

[0039] For the magnet structure 100 of the high-temperature superconducting undulator proposed in this solution, since the coil 4 is wound horizontally, it can effectively reduce the vertical magnetic field component received by the high-temperature superconducting tape, optimize the magnetic field direction to be closer to the critical current direction of the tape, thereby improving the current-carrying capacity of the tape, and further enabling the high-temperature superconducting tape to better exert its performance.

[0040] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A high-temperature superconducting undulator magnet structure, comprising a coil formed by winding a high-temperature superconducting tape, characterized in that: The high temperature superconducting undulator magnet structure comprises: yoke iron; At least two end fixed poles, the two end fixed poles are arranged on the yoke and enclosed with the yoke to form a mounting groove; and A plurality of magnet mounting parts are provided on the yoke and located in the mounting groove, a winding core is protruded on one side of each of the magnet mounting parts, the winding core has a first winding segment, a winding straight segment and a second winding segment connected to each other, the width of the winding straight segment is smaller than the width of the first winding segment and the second winding segment, the end faces of the first winding segment and the second winding segment away from the winding straight segment are arc surfaces, the high temperature superconducting tape is wound around the winding core to form the coil, and is adapted to the outer peripheral wall of the winding core.

2. The high temperature superconducting undulator magnet structure according to claim 1, characterized in that: Each of the magnet mounting parts includes a main pole iron and a secondary pole iron, the winding core body is protruding from one side of the main pole iron, a limited step is formed at the connection between the main pole iron and the winding core body, and a secondary pole iron is arranged between any two adjacent main pole irons; grooves are formed on the opposite side walls of the main pole iron corresponding to the straight section of the winding, and a first convex section is formed on the opposite side walls of the secondary pole iron corresponding to the groove; a second convex section is formed on the end of each end fixed pole iron close to the main pole iron corresponding to the groove.

3. The high temperature superconducting undulator magnet structure according to claim 2, characterized in that: A circular arc transition concave section is formed at the connection between the first winding section and the winding straight section and at the connection between the second winding section and the winding straight section; the circular arc transition concave section includes a first arc section and a second arc section connected to each other.

4. The high temperature superconducting undulator magnet structure according to claim 3, characterized in that: The two side walls of the groove are both formed with the circular arc transition concave section, and both ends of the first convex section and the second convex section are both formed with circular arc transition convex sections adapted to the circular arc transition concave section.

5. The high temperature superconducting undulator magnet structure according to any one of claims 2 to 4, characterized in that: The end of the first winding section extends in a direction away from the winding straight section to form an arc slope section, and a wire inlet channel is provided on a side wall of the main pole iron corresponding to the arc slope section.

6. The high temperature superconducting undulator magnet structure according to claim 5, characterized in that: A first connection portion is formed at one end of the main pole iron close to the first winding segment, and each of the magnet mounting parts includes a commutator, which is detachably connected to the first connection portion, and an inclined concave arc groove adapted to the circular arc inclined surface segment is formed at the end of the commutator.

7. The high temperature superconducting undulator magnet structure according to claim 6, characterized in that: A third winding segment is protruding on the side of the switching member facing away from the yoke, and a side wall of the third winding segment close to the first winding segment is a concave arc surface adapted to the circular arc slope segment, and a side wall of the third winding segment away from the first winding segment is an arc surface, so that the third winding segment is adaptably connected to the first winding segment.

8. The high temperature superconducting undulator magnet structure according to any one of claims 2 to 4, characterized in that: The side wall of the second winding segment away from the end of the winding straight segment is a vertical surface, and each of the magnet mounting parts includes an adjusting part, which is elastically connected to the main pole iron, and a fourth winding segment is protruding from the side of the adjusting part facing away from the yoke iron, and a side wall of the fourth winding segment close to the second winding segment is a vertical surface, and a side wall of the fourth winding segment away from the second winding segment is an arc surface, so that the fourth winding segment is adaptably connected to the second winding segment.

9. The high temperature superconducting undulator magnet structure according to claim 8, characterized in that: Each of the magnet mounting parts includes an elastic part, a first receiving groove is formed on the end surface of the main pole iron close to the adjusting part, a second receiving groove is formed on the end surface of the adjusting part close to the main pole iron, the first receiving groove is connected to the second receiving groove, and the two ends of the elastic part are respectively connected to the bottom wall of the first receiving groove and the bottom wall of the second receiving groove.

10. The high temperature superconducting undulator magnet structure according to claim 9, characterized in that: A second connecting portion is formed at one end of the main pole iron close to the second winding segment, and each of the magnet mounting parts includes a fastener. The second connecting portion is provided with a strip hole arranged along the extension direction of the main pole iron, and the adjusting part is provided with a mounting hole. The fastener passes through the mounting hole and the strip hole to connect the main pole iron and the adjusting part.

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