An insert superconducting high-field magnet device for a synchrotron light source

Abstract

The application discloses an insert superconducting strong magnet device for a synchrotron radiation light source, which comprises a base, wherein a superconducting strong magnet is connected to the base, beam passage assemblies are symmetrically arranged at both ends in the superconducting strong magnet, and superconducting coil assemblies are arranged between the beam passage assemblies; the device introduces the ability of superconducting materials to carry current without resistance in a superconducting state, and the current carrying capacity per unit area of the superconducting materials is about 100 times that of copper; compared with traditional permanent magnets and conventional electromagnets, the device can generate a higher magnetic field strength in a limited space, and thus can solve the problem that the magnetic field strength cannot be further improved by using the permanent magnets or the conventional electromagnets, and provide a periodic high magnetic field for the synchrotron radiation light source.

Description

Technical Field

[0001] This invention relates to the field of superconducting equipment technology, specifically to a superconducting high-power magnet device for use as an insert in a synchrotron radiation source. Background Technology

[0002] A synchrotron radiation source is a physical device that generates synchrotron radiation. It is a high-performance, novel, and powerful light source that utilizes the deflection of relativistic electrons in a magnetic field to produce synchrotron radiation. The advent of electron synchrotrons, and especially the development of electron storage rings, has promoted the widespread application of synchrotron radiation.

[0003] Synchrotron radiation sources possess superior performance unmatched by conventional light sources. Their applications extend beyond fundamental disciplines such as physics, chemistry, and biology, extending to fields like materials science, surface science, metrology, medicine, microscopy, and photolithography for very large-scale integrated circuits, thus holding significant practical value. The performance of synchrotron radiation is directly determined by high-performance periodic insert magnets; research indicates that high-performance inserts (oscillators, wavemakers) can significantly improve the performance of synchrotron radiation.

[0004] In existing technologies, the magnetic field strength of permanent magnets and conventional electromagnets is limited, and the periodic magnetic field strength that can be generated is generally <1T. It is impossible to further increase the magnetic field strength. Moreover, the magnetic field strength of permanent magnets and conventional electromagnets is fixed and cannot be continuously adjusted according to the needs of synchrotron radiation sources. Furthermore, due to the Joule heating problem, conventional electromagnets make it difficult for magnet devices made from conventional conductors to generate the required magnetic field strength in a limited space, which cannot meet the higher requirements of synchrotron radiation sources. Summary of the Invention

[0005] The purpose of this invention is to provide an insert superconducting strong magnet device for synchrotron radiation sources, in order to solve the problems mentioned in the background art, namely, that the magnetic field strength of permanent magnets and conventional electromagnets is limited, and the periodic magnetic field strength that can be generated is generally <1T, making it impossible to further increase the magnetic field strength. In addition, the magnetic field strength of permanent magnets and conventional electromagnets is fixed and cannot be continuously adjusted according to the needs of synchrotron radiation sources. Furthermore, due to the Joule heating problem, conventional electromagnets make it difficult for magnet devices made from conventional conductors to generate the required magnetic field strength in a limited space, thus failing to meet the higher requirements of synchrotron radiation sources.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A superconducting magnet insert device for a synchrotron radiation source includes a base, a superconducting magnet connected to the base, beam channel assemblies symmetrically arranged at both ends inside the superconducting magnet, and a superconducting coil assembly arranged between the beam channel assemblies.

[0008] The base is connected to the superconducting magnet via a support frame, which is connected to the outside of the vacuum outer Dewar of the superconducting magnet. Multiple first-stage refrigerators are installed on the top of the vacuum outer Dewar. A radiation-proof cold screen is installed inside the vacuum outer Dewar, and a helium tank is installed inside the radiation-proof cold screen. Multiple pull rod components are radially and evenly arranged on the outside of the vacuum outer Dewar, and the pull rod components pass through the vacuum outer Dewar and the radiation-proof cold screen and are connected to the superconducting coil assembly. Current leads are symmetrically arranged on both sides of each first-stage refrigerator, and the current leads pass through the vacuum outer Dewar, the radiation-proof cold screen and the helium tank and are connected to the superconducting coil assembly.

[0009] More preferably, the beam channel assembly includes a beam inlet and a beam outlet symmetrically arranged on both sides of the vacuum external Dewar. A vacuum bellows is provided between the beam inlet and the beam outlet and the superconducting coil assembly. The vacuum bellows is connected to the vacuum external Dewar via a third connector. A beam cavity is also provided between the beam inlet and the beam outlet.

[0010] More preferably, a second refrigerator is connected to the lower side of the vacuum bellows, and the vacuum bellows and the second refrigerator are connected to each other through a first connector and a second connector.

[0011] More preferably, the superconducting coil assembly includes an upper superconducting coil array and a lower superconducting coil array, and magnetically shielded yokes are provided on the outer sides of both the upper and lower superconducting coil arrays. The superconducting coils are connected to each other in opposite directions by magnetic poles.

[0012] More preferably, multiple superconducting coils are distributed both on the upper and lower sides of the superconducting coil array, and each superconducting coil is connected to the magnetically shielded yoke via a magnetic pole.

[0013] More preferably, the pull rod component includes a first connecting component, a second connecting component, and a third connecting component, and the first connecting component, the second connecting component, and the third connecting component are connected sequentially from the outside to the inside.

[0014] More preferably, the current lead includes a room temperature portion disposed outside the vacuum outer Dewar, one end of the room temperature portion passing through the vacuum outer Dewar and connected to the high temperature superconducting portion, and the other end of the high temperature superconducting portion being connected to the low temperature superconducting portion.

[0015] More preferably, the vacuum external Dewar is also provided with observation windows at both ends.

[0016] More preferably, an adjustment mechanism is provided at the connection between the base and the support frame.

[0017] More preferably, the vacuum external Dewar is designed to be completely sealed, and the interior of the vacuum external Dewar is a vacuum environment.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This device introduces superconducting materials that have the ability to carry current without resistance in their superconducting state. The current carrying capacity per unit area is about 100 times that of metallic copper. Compared with traditional permanent magnets and conventional electromagnets, it can generate a higher magnetic field strength in a limited space. Therefore, it can solve the problem that current permanent magnets or conventional electromagnets cannot further increase the magnetic field strength, and provide periodic high magnetic fields for synchrotron radiation sources.

[0020] The periodic magnetic field strength generated by the superconducting strong magnet of the present invention can be changed by altering the amount of current flowing through the superconducting coil assembly, which has significant advantages over the fixed magnetic field of permanent magnets and conventional electromagnets.

[0021] Meanwhile, in order to enable the superconducting coil to operate normally, the present invention also introduces related auxiliary components and structures, such as a vacuum external Dewar structure to provide high vacuum for the superconducting strong magnet, a radiation-proof cold shield, a helium tank for liquid helium, and multiple refrigerators, thereby achieving low-temperature operation of the superconducting coil.

[0022] The beam channel assembly and the position adjustment mechanism of the pull rod component for precise spatial adjustment of the configuration of the superconducting magnet of the present invention respectively ensure that the superconducting magnet quenching anomaly induced by the additional thermal load caused by beam divergence and the ultra-high progress requirements of the synchrotron radiation source for the spatial configuration of the magnetic field are addressed. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0025] Figure 3 This is a top view of the overall structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the beam channel assembly and superconducting coil assembly of the present invention;

[0027] Figure 5 This is a partially enlarged schematic diagram of the superconducting coil of the present invention;

[0028] Figure 6 This is a schematic diagram of two-cycle superconducting coils and magnetic field distribution of the superconducting magnet device used as an insert for a synchrotron radiation source according to the present invention.

[0029] Figure 7This is a flowchart illustrating the operation of the superconducting high-power magnet of the present invention.

[0030] In the diagram: 1-Superconducting high magnet, 2-Beam channel assembly, 3-Base, 4-Superconducting coil assembly, 101-First refrigerator, 102-Vacuum external Dewar, 103-Radiation shield, 104-Helium tank, 105-Pull rod assembly, 105A-First connecting component, 105B-Second connecting component, 105C-Third connecting component, 106-Current lead, 106A-Room temperature section, 106B-High temperature superconducting section, 106C-Low temperature superconducting section 107-Supporting frame, 108-Observation window, 201-Second refrigerator, 201A-First connector, 201B-Second connector, 202-Beam inlet, 203-Beam outlet, 204-Vacuum bellows, 205-Third connector, 206-Beam cavity, 401-Upper superconducting coil array, 402-Lower superconducting coil array, 403-Magnetic shielded yoke, 404-Fourth connector, 405-Magnetic pole, 406-Superconducting coil. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-7 The present invention provides a technical solution:

[0033] A superconducting magnet insertion device for a synchrotron radiation source includes a base 3, a superconducting magnet 1 connected to the base 3, beam channel assemblies 2 symmetrically arranged at both ends inside the superconducting magnet 1, and a superconducting coil assembly 4 arranged between the beam channel assemblies 2.

[0034] The base 3 is connected to the superconducting magnet 1 via a support frame 107. The support frame 107 is connected to the outside of the vacuum outer Dewar 102 of the superconducting magnet 1. Multiple first refrigerators 101 are provided on the top of the vacuum outer Dewar 102. A radiation shielding cold screen 103 is provided inside the vacuum outer Dewar 102. A helium tank 104 is provided inside the radiation shielding cold screen 103. Multiple pull rod components 105 are radially and evenly arranged on the outside of the vacuum outer Dewar 102. The pull rod components 105 pass through the vacuum outer Dewar 102 and the radiation shielding cold screen 103 and are connected to the superconducting coil assembly 4. Current leads 106 are symmetrically arranged on both sides of each first refrigerator 101. The current leads 106 pass through the vacuum outer Dewar 102, the radiation shielding cold screen 103 and the helium tank 104 and are connected to the superconducting coil assembly 4. The vacuum external Dewar 102 provides a high vacuum environment for the superconducting magnet to reduce heat leakage from natural air convection in the system. The radiation shield 103 is located between the vacuum external Dewar 102 and the helium tank 104 and is connected to the first-stage cold head of the first refrigerator 101 to achieve lower temperature cooling to reduce heat leakage from radiation in the system. The superconducting coil assembly 4 is located inside the helium tank 4 and is cooled by liquid helium to reduce its temperature below its critical temperature Tc. When the liquid helium evaporates due to the heat load of the system, the helium gas generated is condensed and returned to the helium tank through the second-stage cold head of the first refrigerator 101, thereby realizing the stable operation of the system.

[0035] In this invention, the beam channel assembly 2 includes a beam inlet 202 and a beam outlet 203 symmetrically arranged on both sides of the vacuum external Dewar 102. A vacuum bellows 204 is provided between the beam inlet 202 and the beam outlet 203 and the superconducting coil assembly 4. The vacuum bellows 204 is connected to the vacuum external Dewar 102 via a third connector 205. A beam cavity 206 is also provided between the beam inlet 202 and the beam outlet 203. A second refrigerator 201 is connected to the lower side of the vacuum bellows 204. The vacuum bellows 204 and the second refrigerator 201 are connected to each other via a first connector 201A and a second connector 201B. The connection between the superconducting coil assembly 4 and the beam channel assembly 2 uses a flexible vacuum bellows 204 transition, thus allowing the superconducting coil assembly 4 spatial freedom while ensuring the beam channel assembly 2 is in a vacuum environment, enabling adjustment of the spatial position of the superconducting coil assembly 4. Meanwhile, when beam channel assembly 2 is running in a real synchrotron radiation source, the beam diverges, such as... Figure 3 Therefore, some high-energy electrons will collide with the surface of the beam channel assembly 2, causing the superconducting coil assembly 4 to heat up, which may further cause the superconducting magnet 1 to lose its quench and malfunction. Therefore, by connecting with the second refrigerator 201, this part of the heat load is balanced to maintain the normal and stable operation of the magnet system.

[0036] In this invention, the superconducting coil assembly 4 includes an upper superconducting coil array 401 and a lower superconducting coil array 402. Magnetic shielding yokes 403 are disposed on the outer sides of both the upper and lower superconducting coil arrays 401 and 402. Superconducting coils 406 are connected to the opposing directions of the magnetic shielding yokes 403 via magnetic poles 405. Multiple superconducting coils 406 are evenly distributed on both the upper and lower superconducting coil arrays 401 and 402, and each superconducting coil 406 is connected to the magnetic shielding yoke 403 via a magnetic pole 405. Each coil consists of a magnetic pole 405 and a superconducting coil 406 wound around it. Simultaneously, the superconducting coil assembly 4 and the helium tank 104 are connected to the vacuum external Dewar 2 via a pull rod component 105 and a third connecting component 105C, enabling multi-degree-of-freedom connection and spatial position adjustment of the superconducting coil assembly 4 under external environmental conditions.

[0037] In this invention, the pull rod component 105 includes a first connecting component 105A, a second connecting component 105B, and a third connecting component 105C, and the first connecting component 105A, the second connecting component 105B, and the third connecting component 105C are connected sequentially from the outside to the inside.

[0038] In this invention, the current lead 106 includes a room temperature portion 106A disposed outside the vacuum outer Dewar 102. One end of the room temperature portion 106A passes through the vacuum outer Dewar 102 and is connected to the high temperature superconducting portion 106B. The other end of the high temperature superconducting portion 106B is connected to the low temperature superconducting portion 106C.

[0039] In this invention, observation windows 108 are also provided at both ends of the vacuum external Dewar 102.

[0040] In this invention, an adjustment mechanism is also provided at the connection between the base 3 and the support frame 107. The spatial position of the superconducting magnet 1 can be adjusted by the adjustment mechanism, that is, its up, down, left, right, front, and back positions can be precisely adjusted.

[0041] In this invention, the vacuum external Dewar 102 is designed to be completely sealed, and the interior of the vacuum external Dewar 102 is a vacuum environment. The vacuum external Dewar 102, together with the radiation shield 103, the helium tank 104, and the refrigerator, enables the superconducting coil 406 to operate in a low-temperature environment.

[0042] In this invention, the superconducting material used to generate a strong magnetic field can be either a low-temperature superconducting material or a high-temperature superconducting material.

[0043] In this invention, the first refrigeration unit 101 and the second refrigeration unit 201 are GM refrigeration units.

[0044] Working principle:

[0045] After the superconducting magnet 1 and the beam channel assembly 2 are installed in the synchrotron radiation source accelerator loop, the vacuum unit is first used to evacuate the inside of the superconducting magnet 1, i.e., the vacuum external Dewar 102. When the vacuum level reaches the order of 10-2 Pa, the first refrigerator 101 is turned on to cool the radiation shielding cold screen 103. At the same time, liquid nitrogen can be selected to pre-cool the superconducting coil 406 to 77 K as needed. Liquid helium can be used directly to cool the superconducting coil assembly 4. Temperature sensors are used to monitor the temperature at important temperature detection points. When the temperature of the superconducting coil 406 inside the superconducting magnet 1 is lower than the critical temperature Tc of the superconducting wire, the superconducting coil 406 enters the superconducting state and has the ability to be energized and excited.

[0046] Because synchrotron radiation sources have very strict requirements on the spatial position and related parameters of the magnetic field, the spatial position of the superconducting high magnet 1 needs to be initially adjusted before the magnet is energized. This is mainly done using the base 3 and the pull rod component 105 for adjusting the spatial position of the superconducting coil assembly 4. This adjustment is generally based on the coordination relationship between the beam tube inlet and outlet and related equipment. After the requirements are met, the superconducting coil assembly 4 is energized through the current lead 106. When the preset value is reached, the beam is introduced into the beam channel assembly 2 from the beam inlet 202 through the beam channel pre-switch. After being deflected by the magnetic field, a corresponding free electron laser is generated and discharged from the beam outlet 203. Data is collected by relevant instruments and equipment to determine whether the requirements are met. If the requirements are not met, the magnet current is changed until the magnetic field strength meets the requirements. The magnetic field configuration generated by the insert magnet of the synchrotron radiation source is as follows: Figure 6 As shown, the waveform is a periodic trigonometric function. The magnetic fields generated between two adjacent superconducting coils 406 are in opposite directions, and the magnetic field strength also exhibits a periodic variation. Then, the spatial position of the superconducting coil assembly 4 is precisely adjusted using the pull rod component 105, and the adjustment is observed through the observation window 108. Finally, the spatial configuration of the beam is used to determine whether the superconducting coil assembly 4 is in the correct spatial position and whether further adjustment is needed. If not, the above process is repeated until the requirements are met, and subsequent experimental tests are conducted. After the test, the superconducting power supply is de-energized as needed, awaiting the next experimental test.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A superconducting magnet device for inserting a synchrotron radiation source, comprising a base (3), characterized in that: A superconducting magnet (1) is connected to the base (3). A beam channel assembly (2) is symmetrically arranged at both ends inside the superconducting magnet (1). A superconducting coil assembly (4) is arranged between the beam channel assemblies (2). The base (3) is connected to the superconducting magnet (1) via a support frame (107). The support frame (107) is connected to the outside of the vacuum external Dewar (102) of the superconducting magnet (1). The top of the vacuum external Dewar (102) is provided with multiple first refrigerators (101). The vacuum external Dewar (102) is provided with a radiation-proof cold screen (103). The radiation-proof cold screen (103) is provided with a helium tank (104). The vacuum external Dewar (102) is connected to the superconducting magnet (102) via a support frame (107). 2) Multiple pull rod components (105) are evenly arranged radially on the outer side, and the pull rod components (105) pass through the vacuum external Dewar (102) and the radiation shield (103) and are connected to the superconducting coil assembly (4). Each of the first refrigerators (101) is also symmetrically arranged with current leads (106) on both sides, and the current leads (106) pass through the vacuum external Dewar (102), the radiation shield (103) and the helium tank (104) and are connected to the superconducting coil assembly (4). The superconducting coil assembly (4) includes an upper superconducting coil array (401) and a lower superconducting coil array (402). Magnetic shielding yokes (403) are provided on the outer sides of both the upper superconducting coil array (401) and the lower superconducting coil array (402). Superconducting coils (406) are connected between opposite directions of the magnetic shielding yokes (403) via magnetic poles (405). The current lead (106) includes a room temperature portion (106A) disposed outside the vacuum external Dewar (102), one end of the room temperature portion (106A) passes through the vacuum external Dewar (102) and is connected to the high temperature superconducting portion (106B), and the other end of the high temperature superconducting portion (106B) is connected to the low temperature superconducting portion (106C).

2. The superconducting magnet device for inserting a synchrotron radiation source according to claim 1, characterized in that: The beam channel assembly (2) includes a beam inlet (202) and a beam outlet (203) symmetrically arranged on both sides of the vacuum external Dewar (102). A vacuum bellows (204) is provided between the beam inlet (202) and the beam outlet (203) and the superconducting coil assembly (4). The vacuum bellows (204) is connected to the vacuum external Dewar (102) through a third connector (205). A beam cavity (206) is also provided between the beam inlet (202) and the beam outlet (203).

3. The superconducting magnet device for inserting a synchrotron radiation source according to claim 2, characterized in that: The lower side of the vacuum bellows (204) is also connected to a second refrigerator (201), and the vacuum bellows (204) and the second refrigerator (201) are connected to each other through a first connector (201A) and a second connector (201B).

4. The superconducting magnet device for inserting a synchrotron radiation source according to claim 1, characterized in that: Multiple superconducting coils (406) are distributed on both the upper (401) and lower (402) of the superconducting coil array, and each superconducting coil (406) is connected to the magnetically shielded yoke (403) through a magnetic pole (405).

5. The superconducting magnet device for inserting a synchrotron radiation source according to claim 1, characterized in that: The pull rod component (105) includes a first connecting component (105A), a second connecting component (105B), and a third connecting component (105C), and the first connecting component (105A), the second connecting component (105B), and the third connecting component (105C) are connected sequentially from the outside to the inside.

6. The superconducting magnet device for inserting a synchrotron radiation source according to claim 1, characterized in that: The vacuum external Dewar (102) is also provided with observation windows (108) at both ends.

7. The superconducting magnet device for inserting a synchrotron radiation source according to claim 1, characterized in that: An adjustment mechanism is also provided at the connection between the base (3) and the support frame (107).

8. The superconducting magnet device for inserting a synchrotron radiation source according to claim 1, characterized in that: The vacuum external Dewar (102) is designed to be completely sealed, and the interior of the vacuum external Dewar (102) is a vacuum environment.

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