Superconducting magnet device, particle accelerator and radiotherapy equipment

Abstract

The invention discloses a superconducting magnet device, a particle accelerator and radiotherapy equipment, and the superconducting magnet device comprises a magnet assembly and a control assembly. The magnet assembly comprises an iron yoke and a coil framework, the iron yoke is provided with a first connecting port, and the coil framework is provided with a second connecting port; the coil framework is provided with two mounting grooves, and each mounting groove is used for mounting a superconducting coil; the coil framework is further provided with a boss, and the boss is used for separating the two installation grooves. The internal hollow part of the boss is communicated with the two mounting grooves; the second connecting port extends from the outer wall of the coil framework to the inner wall of the boss; the control assembly is connected with the superconducting coil through the first connecting port and the second connecting port, and the control assembly extends to the internal hollow part of the boss through the second connecting port. The superconducting magnet device, the particle accelerator and the radiotherapy equipment are used for simplifying the connection structure of the control assembly and the superconducting coil.

Description

[0001] This application is a divisional application of a Chinese application with the application number 202410240234.7, the application date of March 4, 2024, and the invention title of "Superconducting Magnet Device, Particle Accelerator and Radiotherapy Equipment". Technical Field

[0002] The present invention relates to the technical field of high-end medical equipment, and particularly relates to a superconducting magnet device, a particle accelerator and a radiotherapy equipment. Background Art

[0003] Since the birth of superconducting technology in the early 20th century, people's understanding of the origin of superconductivity has been continuously deepening with the development of science and technology. The development of new materials has led to the rapid rise of the application of superconducting technology. In the medical field, a particle accelerator is a device that applies superconducting technology. The particle accelerator generates a magnetic field through a superconducting magnet, and controls the treatment particles to emit along the beam output channel through this magnetic field. After the treatment particles are emitted from the cyclotron, they irradiate the patient to treat the patient. One of the main components in the superconducting magnet of the particle accelerator is a superconducting coil formed by winding a superconducting material.

[0004] For example, low-temperature superconducting materials such as NbTi, Nb 3 Sn, etc. have excellent electromagnetic properties, and the processes of single-filament single-core and multi-filament composite superconducting wire materials are mature, which are one of the materials for winding superconducting coils. In addition, there also exists a way to combine low-temperature superconducting materials with high-temperature superconducting materials to manufacture superconducting coils, so as to increase the magnetic field strength that can be generated by the prepared superconducting magnet. Although the existing superconducting magnets prepared by using low-temperature superconducting materials or the combination of low-temperature superconducting materials and high-temperature superconducting materials have met the daily use requirements, in order to keep the low-temperature superconducting materials or the combination of low-temperature superconducting materials and high-temperature superconducting materials in a superconducting state, it has relatively high requirements for the working temperature of the superconducting coil, and its working temperature generally needs to be maintained at an extremely low condition of 1.8K (Kelvins).

[0005] Due to the relatively low working temperature of the existing superconducting magnets, they need to be used in combination with components such as cold screens, resulting in a relatively complex structure of the superconducting magnet device and a relatively high cost. When the temperature needs to reach a level less than 4K, it poses certain challenges to the design of low-temperature equipment and heat leakage prevention structures in the superconducting magnet, and increases the operation and maintenance costs of superconducting applications, and requires the provision of high-power low-temperature equipment and refrigerants. As a result, ordinary application scenarios such as ordinary hospitals or clinics are deterred from using superconducting technology. Summary of the Invention

[0006] The purpose of the present invention is to provide a superconducting magnet device, a particle accelerator and a radiotherapy equipment, which are used to simplify the connection structure between the control component and the superconducting coil.

[0007] The object of the present invention is achieved by the following technical solutions:

[0008] A superconducting magnet device, comprising:

[0009] A magnet assembly, including a yoke, a coil former, an iron core and a superconducting coil. The yoke surrounds to form an accommodation space. The coil former and the iron core are arranged in the accommodation space, and the superconducting coil is arranged between the coil former and the iron core. The yoke is provided with a through first connection port, and the coil former is provided with a second connection port for communicating the first connection port and the superconducting coil. The coil former is provided with two installation slots, and each installation slot is used for installing the superconducting coil. Among them, the two installation slots are distributed at intervals along the axial direction of the coil former. The coil former is further provided with a boss extending from the inner wall of the coil former towards the center of the coil former, and the boss is used for separating the two installation slots. The boss is in an annular structure, and the hollow part inside the boss communicates with the two installation slots. The second connection port extends from the outer wall of the coil former to the inner wall of the boss.

[0010] A control assembly, which is connected to the superconducting coil through the first connection port and the second connection port, and the control assembly extends to the hollow part inside the boss through the second connection port for connection.

[0011] Preferably, the axial direction of the superconducting coil is the same as the axial direction of the coil former, and no cold shield is provided outside the yoke. The superconducting coil is formed by winding a plurality of high-temperature superconducting tapes circumferentially, and the plurality of high-temperature superconducting tapes are arranged at intervals, and the height direction of the high-temperature superconducting tape is parallel to the magnetic field direction generated by the superconducting coil after power-on.

[0012] Preferably, the high-temperature superconducting tapes are wound to form a multi-layer superconducting coil, and adjacent layers of the superconducting coils are distributed at intervals.

[0013] The magnet assembly further includes a quench detection and protection unit for detecting whether the superconducting coil quenches and protecting the superconducting coil during quenching. The quench detection and protection unit is arranged between adjacent layers of the superconducting coils.

[0014] Preferably, the quench detection and protection units are uniformly distributed between adjacent layers of the superconducting coils, or the quench detection and protection units are concentrated at some positions in the gap between adjacent layers of the superconducting coils.

[0015] Preferably, the quench detection and protection unit includes a quench detection circuit and a quench protection circuit. The quench detection circuit is used to detect whether the superconducting coil quenches according to the change in voltage difference, and the quench protection circuit is used to protect the superconducting coil through quench heating.

[0016] Preferably, the material of the high-temperature superconducting tape is one or more of REBCO, YBCO, MgB 2 , Bi2212 or Bi2223.

[0017] Preferably, the control assembly includes a refrigeration unit and an electrical unit. The refrigeration unit is used to provide a cold source to the superconducting coil so that the temperature at the superconducting coil reaches the operating temperature of the superconducting coil. The electrical unit is electrically connected to the superconducting coil to control the superconducting coil; the superconducting magnet device is not provided with a pipeline matching the refrigerant.

[0018] Preferably, the yoke is provided with a through first connection port, and the coil skeleton is provided with a second connection port. The second connection port is used to connect the first connection port and the superconducting coil, and the control assembly is connected to the superconducting coil through the first connection port and the second connection port.

[0019] Preferably, a D-shaped box is arranged inside the iron core, and the magnet assembly is provided with an outgoing beam track. One end of the outgoing beam track extends to the D-shaped box, and the other end of the outgoing beam track penetrates through the magnet assembly; the D-shaped box is used to accelerate the therapeutic particles, and the therapeutic particles are emitted through the outgoing beam track under the action of the magnetic field generated by the magnet assembly.

[0020] Preferably, the superconducting coil is installed in the accommodating space through a suspension device. The suspension device is connected to the yoke, and the connection position of the suspension device and the yoke is adjustable to realize the adjustment of the position of the superconducting coil and adjust the beam direction of the therapeutic particles.

[0021] Preferably, the control assembly further includes a control box and a connecting pipe. The control box is connected to the magnet assembly through the connecting pipe; the refrigeration unit includes a cold head and a refrigeration connection connected to the cold head, and the electrical unit includes an electrical integration and an electrical connection connected to the electrical integration. The cold head and the electrical integration are integrated on the first cover of the control box, and the refrigeration connection, the second cover and the electrical connection pass through the connecting pipe and are connected to the magnet assembly.

[0022] Preferably, a connection cavity is formed in the connecting pipe, and the control assembly further includes a connecting wire protective cover disposed in the connection cavity; the refrigeration connection is disposed in the connection cavity and outside the connecting wire protective cover, and the electrical connection is disposed in the connecting wire protective cover and separated from the refrigeration connection by the connecting wire protective cover;

[0023] And / or, the control box includes a second cover body made of a transparent material.

[0024] Preferably, the second cover body is prepared from a carbon fiber reinforced polyimide composite material.

[0025] A particle accelerator includes the superconducting magnet device of any one of the above.

[0026] A radiotherapy device includes the above particle accelerator.

[0027] Compared with the prior art, the beneficial effects of the present invention at least include:

[0028] The second connection port extends from the outer wall of the coil bobbin to the inner wall of the boss. When the control assembly extends to the inner hollow part of the boss through the second connection port, since the inner hollow part of the boss can communicate with the two mounting grooves, the control assembly can realize the connection with the superconducting coils in the two mounting grooves at this time, simplifying the connection structure between the control assembly and the superconducting coils; by winding a high-temperature superconducting tape to form a superconducting coil, the working temperature required for the superconducting coil can reach 20K. Therefore, the magnet assembly does not need to use a large amount of refrigerant, which can reduce the use cost of the superconducting magnet device and can also simplify the structure of the superconducting magnet. By setting the height direction of the high-temperature superconducting tape parallel to the magnetic field direction, the critical magnetic field and critical current parameters of the high-temperature superconducting tape are relatively high, which can fully meet the working requirements of the superconducting magnet device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural view of the superconducting magnet device according to an embodiment of the present invention;

[0030] Figure 2 is a plane cross-sectional view of the superconducting magnet device according to an embodiment of the present invention;

[0031] Figure 3 is a plane cross-sectional view of the magnet assembly according to an embodiment of the present invention;

[0032] Figure 4 is a cross-sectional view of the magnet assembly according to an embodiment of the present invention in another cross-section;

[0033] Figure 5 is a partial structural view of the magnet assembly according to an embodiment of the present invention;

[0034] Figure 6 is a partial plan sectional view of the superconducting coil according to an embodiment of the present invention;

[0035] Figure 7 is a schematic structural view of the coil skeleton according to an embodiment of the present invention;

[0036] Figure 8 is a schematic structural view of the control component according to an embodiment of the present invention.

[0037] In the figure: 1, magnet assembly; 11, accommodation space; 12, superconducting coil; 13, quench detection and protection unit; 14, yoke; 141, first connection port; 15, coil skeleton; 151, second connection port; 152, mounting groove; 153, boss; 16, iron core; 17, D-shaped box; 18, beam output track; 2, control component; 21, refrigeration unit; 211, cold head; 22, electrical unit; 221, electrical integration; 23, control box; 231, first cover; 232, second cover; 24, connecting pipe; 241, connecting cavity; 25, connecting wire protection cover. Detailed implementation manners

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their repeated description will be omitted.

[0039] In the present invention, the words expressing position and direction are described with reference to the accompanying drawings as examples, but can be changed according to needs, and all changes made are included in the protection scope of the present invention.

[0040] As Figures 1 to 8 shown, the present invention provides a superconducting magnet device, including a magnet assembly 1 and a control component 2.

[0041] The magnet assembly 1 is used to generate a magnetic field. Specifically, the device for generating the magnetic field in the magnet assembly 1 is mainly a superconducting coil 12 disposed inside the magnet assembly 1. The superconducting coil 12 is formed by winding a plurality of high-temperature superconducting tapes circumferentially, and the plurality of high-temperature superconducting tapes are arranged at intervals. When the superconducting coil 12 is energized, the superconducting coil 12 generates a magnetic field. Since the superconducting coil 12 uses high-temperature superconducting materials, the operating temperature required for the superconducting coil 12 can reach 20K, which is much higher than the operating temperatures of superconducting coils prepared from low-temperature superconducting materials and superconducting coils prepared by combining low-temperature and high-temperature superconducting materials. Therefore, the magnet assembly 1 of the present invention only requires a small amount of refrigerant and does not need to use a large amount of refrigerant (such as liquid helium) to reach the required operating temperature, which can reduce the use cost of the superconducting magnet device. In addition, because only a small amount of refrigerant is involved in the superconducting magnet device, the structure of the superconducting magnet is also simplified, and complex pipelines and other structures when a large amount of refrigerant is provided are not required, and the magnet assembly 1 does not need to be provided with a cold screen and other structures. Among them, the material of the high-temperature superconducting tape can be REBCO (rare earth barium copper oxide), YBCO (yttrium barium copper oxide), MgB 2 、Bi2212 (Bi 2 Sr 2 CaCu 2 O 8 ) or Bi2223 (Bi 2 Sr 2 Ca 2 Cu 3 O 10 ), or one or more of them. Preferably, the material of the high-temperature superconducting tape is REBCO.

[0042] To increase the maximum magnetic field strength of the superconducting coil 12, the height direction of the high-temperature superconducting tape can be parallel to the magnetic field direction. When the height direction of the high-temperature superconducting tape is parallel to the magnetic field direction, the critical magnetic field and critical current parameters of the high-temperature superconducting tape are relatively high. At this time, the maximum magnetic field strength that can be generated by the superconducting coil 12 prepared from the high-temperature superconducting tape can reach 10T (Tesla), the maximum magnetic field strength along the axial direction of the superconducting coil 12 can reach 9.6T, and the maximum magnetic field strength along the radial direction can reach 7T, achieving an ultra-high magnetic field strength and better meeting the working requirements of the superconducting magnet device. Among them, the high-temperature superconducting tape can be wound circumferentially to form a superconducting coil 12 with an annular structure.

[0043] In addition, the minimum quench energy of high-temperature superconducting materials is 2 to 3 orders of magnitude higher than that of low-temperature superconducting materials. When a superconducting magnet device using low-temperature superconducting materials experiences a quench due to problems such as internal wire movement or lack of filling material, a superconducting magnet device using high-temperature superconducting materials can avoid quenching. Moreover, the superconducting magnet device using high-temperature superconducting materials also has better operational stability and robust control characteristics, which can improve the reliability of the superconducting magnet device.

[0044] Referring to Figure 3 , the magnet assembly 1 may specifically include a yoke 14, a coil bobbin 15, an iron core 16, and a superconducting coil 12, and there is no need to provide a cold screen outside the yoke 14 for the magnet assembly 1. The yoke 14 defines an accommodation space 11 for accommodating the coil bobbin 15, the iron core 16, and the superconducting coil 12. When the superconducting coil 12 generates a magnetic field, the yoke 14 can be used to concentrate the magnetic field and reduce the leakage magnetic field. Moreover, the yoke 14 can also be used to provide a saturated magnetic field with a certain field strength. Among them, the accommodation space 11 can maintain a vacuum state during operation to meet the required vacuum degree, and maintain the required operating temperature under the action of the control assembly 2, that is, the temperature is about 20K.

[0045] Referring to Figure 5 and Figure 7 , an installation groove 152 is formed in the coil bobbin 15 for installing the superconducting coil 12, and the axial direction of the installation groove 152 can be the same as the axial direction of the superconducting coil 12. The axis of the installation groove 152 can be parallel to the axis of the superconducting coil 12, and the wall forming the installation groove 152 can be in contact with the outer peripheral wall of the superconducting coil 12. The coil bobbin 15 can generate a certain pre-tightening force on the superconducting coil 12 disposed in the installation groove 152. Specifically, the coil bobbin 15 can generate a pre-tightening force on the superconducting coil 12 through thermal shrinkage. For example, the radial cross-section of the installation groove 152 can be slightly smaller than the radial cross-section of the superconducting coil 12, so that the installation groove 152 and the superconducting coil 12 are in interference fit; when installing the superconducting coil 12, the superconducting coil 12 will be pre-cooled first to make it shrink, and then the shrunk superconducting coil 12 is installed in the installation groove 152. During the process of the superconducting coil 12 returning to normal temperature, it will expand. Therefore, the superconducting coil 12 can be closely attached to the coil bobbin 15, and the wall of the coil bobbin 15 forming the installation groove 152 can generate a pre-tightening force on the superconducting coil 12.

[0046] In some specific embodiments, the coil bobbin 15 may be provided with two mounting grooves 152, and each mounting groove 152 can be used to mount the superconducting coil 12. Among them, the two mounting grooves 152 are spaced along the axial direction of the coil bobbin 15; the coil bobbin 15 is further provided with a boss 153 extending from the inner wall of the coil bobbin 15 towards the center of the coil bobbin 15, and the boss 153 is used to separate the two mounting grooves 152. The boss 153 may be in an annular structure, and the hollow part inside the boss 153 can communicate with the two mounting grooves 152.

[0047] Referring to Figure 3 , in some specific embodiments, the superconducting coil 12 needs to be connected to the control component 2 so that the superconducting coil 12 can generate a magnetic field under the action of the current provided by the control component 2. To facilitate the connection between the superconducting coil 12 and the control component 2, the yoke 14 may be provided with a through first connection port 141, and the first connection port 141 is used to communicate the external space of the magnet assembly 1 with the accommodation space 11 inside the yoke 14. The coil bobbin 15 may be provided with a second connection port 151, one end of the second connection port 151 communicates with the first connection port 141, and the other end communicates with the mounting groove 152 that accommodates the superconducting coil 12, so that the first connection port 141 and the second connection port 151 jointly form a channel extending from the outside of the magnet assembly 1 to the superconducting coil 12, and the superconducting coil 12 can be connected to the control component 2 through the channel formed by the first connection port 141 and the second connection port 151.

[0048] There may be multiple first connection ports 141 and second connection ports 151. Among them, at least one first connection port 141 and the corresponding at least one second connection port 151 are used to realize the connection between the superconducting coil 12 and the control component 2. For example, when both the first connection port 141 and the second connection port 151 are set to four, each first connection port 141 and the corresponding second connection port 151 form a connection channel. Among them, one connection channel is used to connect to the control component 2, and another connection channel can be hermetically connected to the vacuum flange, so that the vacuum device can evacuate the accommodation space 11 inside the yoke 14. Another connection channel can be used as the beam outlet for the treatment particles to emit. Another connection channel can be used as the radio frequency port for connecting to the radio frequency device, and the radio frequency device can be used to connect to the D-shaped box 17 inside the iron core 16 to periodically change the polarity of the D-shaped box, so that the particles are continuously accelerated in the magnetic field until they are emitted. It should be noted that when the magnet assembly 1 also needs to be connected to other external components, the first connection port 141 and the second connection port 151 can be set to more than 4, such as 5 or 6, so that the magnet assembly 1 can be connected to the required external devices as needed.

[0049] Referring to Figure 7, in some specific embodiments, the second connection port 151 can extend from the outer wall of the coil bobbin 15 to the inner wall of the boss 153. When the control component 2 extends into the inner hollow part of the boss 153 through the second connection port 151, since the inner hollow part of the boss 153 can communicate with the two mounting grooves 152, the control component 2 can then be connected to the superconducting coils 12 in the two mounting grooves 152, simplifying the connection structure between the control component 2 and the superconducting coils 12.

[0050] Refer to Figure 3 , the iron core 16 is arranged inside the superconducting coil 12 so that the superconducting coil 12 is clamped between the coil bobbin 15 and the iron core 16. The iron core 16 and the yoke 14 are made of high-permeability materials, having a relatively high magnetic flux density and a relatively low magnetic resistance, and can effectively guide and concentrate the magnetic field. Therefore, the iron core 16 and the yoke 14 can be jointly used to provide a saturated magnetic field with a certain field strength inside the magnet assembly 1.

[0051] Refer to Figure 4 , in some specific embodiments, the magnet assembly 1 is further provided with an exit beam track 18. The exit beam track 18 can penetrate through the iron core 16 and the coil bobbin 15. Specifically, the exit beam track 18 extends from the inside of the iron core 16 to the boss 153 of the coil bobbin 15 and continues to extend through the coil bobbin 15, and can communicate with the outside of the magnet assembly 1 through a first connection port 141 of the yoke 14. Among them, the exit beam track 18 can be arranged in a spiral shape. A D-shaped box 17 can be arranged inside the iron core 16, and the D-shaped box 17 can be connected to the control component 2. The D-shaped box 17 is used to accelerate the refrigerated particles, and the therapeutic particles are emitted along the exit beam track 18 under the action of the magnetic field inside the magnet assembly 1, and then pass through other interface devices to perform particle irradiation treatment on the patient.

[0052] Refer to Figure 6 , the high-temperature superconducting material can be wound into multiple layers of superconducting coils 12, and adjacent layers of superconducting coils 12 are spaced apart. Specifically, the superconducting coils 12 can form multiple rows in the radial direction thereof, and each row includes a plurality of superconducting coils 12 spaced apart; at the same time, the superconducting coils 12 can form multiple columns in the axial direction thereof, and each column includes a plurality of superconducting coils 12 spaced apart. The gaps between the multiple superconducting coils 12 can be filled with resin to insulate the multiple superconducting coils 12 from each other.

[0053] When the superconducting coil 12 is in operation, it may lose its superconductivity due to equipment failures, human factors, etc. That is, a part of the superconducting coil 12 loses superconductivity. At this time, a large amount of heat will be generated when the current passes through this part. The quench conduction speed of high-temperature superconducting materials is relatively slow, which will cause the heat to not dissipate quickly, and then concentrate at the quench position. As the heat accumulates continuously, the superconducting coil 12 will be damaged. To avoid damage to the superconducting coil 12 caused by quenching, the magnet assembly 1 is also provided with a quench detection and protection unit 13. The quench detection and protection unit 13 can be arranged between adjacent two layers of superconducting coils 12. The quench detection and protection unit 13 is used to detect whether the superconducting coil 12 quenches and protect the superconducting coil 12 when quenching occurs. Among them, the reaction speed of the quench detection and protection unit 13 is relatively sensitive, and it can quickly react after detecting the quench of the superconducting coil 12 to protect the superconducting coil 12. The quench detection and protection unit 13 can be turned on in manual or automatic mode. For example, the quench detection and protection unit 13 can be automatically turned on after detecting a quench, or after a quench occurs, the staff can turn it on through a control switch.

[0054] The quench detection and protection units 13 can be evenly distributed between adjacent two layers of superconducting coils 12. For example, the quench detection and protection unit 13 is arranged in the gap in the radial direction between adjacent superconducting coils 12, and the circumferential profile of the quench detection and protection unit 13 is adapted to the circumferential profile of the superconducting coil 12, so that corresponding quench detection and protection units 13 are arranged in the circumferential direction of the superconducting coil 12. Therefore, the quench detection and protection unit 13 can detect all positions in the circumferential direction of the superconducting coil 12.

[0055] In addition, the quench detection and protection units 13 can also be concentrated at some positions in the gap between adjacent two layers of superconducting coils 12. For example, the quench detection and protection unit 13 is arranged in the gap in the radial direction between adjacent superconducting coils 12, and only some positions are provided with quench detection and protection units 13 in the circumferential direction along the superconducting coil 12, so that the quench detection and protection unit 13 detects and protects this position; among them, some positions can occupy 1 / 3, 1 / 2 or 2 / 3, etc. of the superconducting coil 12. According to different usage conditions, usage sessions, etc., it can be selected according to specific requirements to use the quench detection and protection unit 13 to detect and protect all positions of the superconducting coil 12, or only detect and protect the part of the superconducting coil 12 that has a quench risk.

[0056] Among them, in the radial direction of the superconducting coil 12, a quench detection and protection unit 13 can be provided between all adjacent superconducting coils 12, or a quench detection and protection unit 13 can be provided between some of the superconducting coils 12. Specifically, in any one installation groove 152, in the radial direction of the superconducting coil 12, a quench detection and protection unit 13 can be provided for every certain number of columns of superconducting coils 12, and the length of the quench detection and protection unit 13 along the axial direction of the superconducting coil 12 is the same as or close to the total length of one column of superconducting coils 12. Since the distance between adjacent superconducting coils 12 is small in the radial direction of the superconducting coil 12, the quench detection and protection unit 13 can not only detect and protect the adjacent superconducting coils 12, but also detect and protect the superconducting coils 12 adjacent to the quench detection and protection unit 13. Even if a quench detection and protection unit 13 is provided for every certain number of columns of superconducting coils 12, the superconducting coils 12 can still be kept adjacent to the quench detection and protection unit 13. Therefore, the quench detection and protection unit 13 can detect and protect a certain number of columns of superconducting coils 12 in the radial direction of the superconducting coil 12. Among them, the certain number of columns can be two columns, three columns, four columns, etc. In this embodiment, a quench detection and protection unit 13 can be provided for every three columns of superconducting coils 12 in the radial direction of the superconducting coil 12.

[0057] Specifically, the quench detection and protection unit 13 can include a quench detection circuit and a quench protection circuit. The quench detection circuit can be connected to the control component 2, and the quench detection circuit is used to detect whether the superconducting magnet quenches according to the change of the voltage difference. Specifically, a certain voltage difference will be generated when the quench detection circuit is working, and when a certain part of the superconducting coil 12 quenches, the magnetic field generated by this part of the superconducting coil 12 disappears, and it will cause a large change in the voltage difference of the quench detection circuit. If the changed voltage difference does not drop within a certain time, such as 0.1 s, 0.5 s, etc., it is determined that the superconducting coil 12 has quenched. At this time, the quench detection circuit can give feedback to the control component 2, and the control component 2 can control the quench protection circuit to start. Among them, the quench detection circuit can be composed of a wire and a voltage-sensitive material. There can be multiple voltage-sensitive materials, and the multiple voltage-sensitive materials can be distributed at intervals along the circumferential direction of the superconducting coil 12 to detect each position of the superconducting coil 12. The multiple voltage-sensitive materials are connected in series through wires, and the quench detection circuit can also be connected to the control unit through wires. The voltage-sensitive material is a material sensitive to voltage signals, such as semiconductor materials such as silicon and germanium.

[0058] The quench protection circuit is used to protect the superconducting coil 12 through quench heating. Specifically, when the superconducting coil 12 quenches, the quench protection circuit will be activated, and it will cut off the connection circuit between the control component 2 and the superconducting coil 12, and will perform quench heating to generate heat. The heat will be transferred to various parts of the superconducting coil 12, so that the temperature of the superconducting coil 12 rises, and all positions of the superconducting coil 12 will quench, so that the heat generated by the quench of the superconducting coil 12 is dispersed to all positions of the superconducting coil 12, avoiding heat concentration at one position and causing damage to the superconducting coil 12 at that position. Among them, the quench detection circuit can include a wire and a heating element. The heating elements can be set in multiple numbers. The multiple heating elements can be distributed at intervals along the circumference of the superconducting coil 12, and the multiple heating elements can be connected in series through wires; among them, the heating element can be a resistor. When the superconducting coil 12 quenches, a part of the magnetic field of the superconducting coil 12 changes, so that an induced current is generated in the quench detection circuit and the heating element is heated. The heating element conducts the heat to all positions of the superconducting coil 12, so that all positions of the superconducting coil 12 quench due to the temperature rise, and then the energy generated by the quench of the superconducting coil 12 is dispersed to all positions of the superconducting coil 12 to protect the superconducting coil 12.

[0059] In some specific embodiments, due to tolerances in the processing of each component of the superconducting magnet device, after all components are assembled together, due to the accumulation of tolerances, the angle of the therapeutic particle beam during emission may deviate from the predetermined angle. To adjust the emission direction of the therapeutic particle, the superconducting magnet device may further include a suspension device (not shown in the figure). The suspension device is installed on the yoke 14 and is connected to the coil skeleton 15 and the superconducting coil 12, so that the coil skeleton 15 and the superconducting coil 12 can be suspended in the yoke 14 through the suspension device. The connection position of the suspension device and the yoke 14 is adjustable, so that the positions of the coil skeleton 15 and the superconducting coil 12 in the yoke 14 are adjustable, and then the beam direction of the therapeutic particle is adjusted to make the emission angle of the therapeutic particle the same as the predetermined angle.

[0060] The suspension device can specifically be formed by a combination of multiple bolts and sensors. The sensor is used to detect the pulling force of the bolts on the coil skeleton 15 and the superconducting coil 12 in the yoke 14. The bolts are used to suspend the coil skeleton 15 and the superconducting coil 12 in the yoke 14. To facilitate the adjustment of the suspension assembly, the superconducting magnet device can be connected to an external adjustment device. The external adjustment device can extend into the yoke 14 through one or more first connection ports 141 in the yoke 14. The external adjustment device can include a wrench part extending into the yoke 14 and a control part for controlling the wrench part. The control part can control the wrench part to turn the bolts or loosen the bolts to adjust the positions of the coil skeleton 15 and the superconducting coil 12 in the yoke 14.

[0061] Reference Figure 2 and Figure 7 Figure 2 and Figure 7 , the control component 2 may include a control box 23, a connecting pipe 24, a refrigeration unit 21, and an electrical unit 22. The refrigeration unit 21 is used to provide a cold source to the superconducting coil 12 so that the temperature of the superconducting coil 12 reaches the operating temperature of the superconducting coil 12. Specifically, the refrigeration unit 21 includes a cold head 211 and a refrigeration connection (not shown in the figure) connected to the cold head 211. The cold head 211 is used to generate a cold source. The refrigeration connection is connected to the magnet assembly 1 to transfer the cold source generated by the cold head 211 into the magnet assembly 1, so that the temperature of the superconducting coil 12 reaches the operating temperature of the superconducting coil 12. Among them, the refrigeration connection may be a structure such as a line for transporting the cold source.

[0062] and

[0062] , the electrical unit 22 is used to be electrically connected to the superconducting coil 12 to control the superconducting coil 12. Specifically, the electrical unit 22 includes an electrical integration 221 and an electrical connection (not shown in the figure) connected to the electrical integration 221. The electrical integration 221 may be integrated in the control box 23. The electrical connection is used to connect the electrical integration 221 to components such as the superconducting coil 12, the quench detection and protection unit 13, or an external sensor. Among them, the electrical connection may be an electrical connection structure such as a wire or a connector.

[0063] and

[0063] , the control box 23 may include a plurality of covers. The plurality of covers may jointly enclose to form an accommodation cavity, and the accommodation cavity is used to accommodate part of the structures of the refrigeration connection and the electrical connection. The plurality of covers may include a first cover 231 and a second cover 232. The first cover 231 is used to integrate the cold head 211 and the electrical integration 221. Since the superconducting magnet device of the present invention only needs to use a small amount of refrigerant, the control box 23 does not need to integrate the complex pipeline structure when providing a large amount of refrigerant, so that the cold head 211 and the electrical integration 221 can be highly integrated. For example, the cold head 211 and the electrical integration 221 are centrally arranged on the first cover 231. In some specific embodiments, to facilitate observing the states of the refrigeration connection and the electrical connection inside the control box 23, the second cover 232 may be made of a transparent material, so that when the superconducting magnet device is working, the staff can observe the states of the refrigeration connection and the electrical connection inside the control box 23 through the second cover 232, and can quickly locate the fault position when a fault occurs, so as to perform positioning maintenance on the fault position and increase the maintenance efficiency of the equipment. Among them, the second cover 232 may specifically be prepared by using a carbon fiber reinforced polyimide composite material.

[0064] The control box 23 can be connected to the magnet assembly 1 through a connecting pipe 24. Specifically, one end of the connecting pipe 24 can be connected to the control box 23, and the other end can pass through the first connection port 141 of the yoke 14 and the second connection port 151 of the coil bobbin 15 to extend near the superconducting coil 12. The connecting pipe 24 can be a hollow pipe body, and a connecting cavity 241 is formed inside. The refrigeration connection and the electrical connection can pass through the connecting pipe 24 from inside the control box 23, so that the refrigeration connection can supply a cold source to the superconducting coil 12, and the electrical connection can be connected to the superconducting coil 12 and the quench detection and protection unit 13.

[0065] In some specific embodiments, the control assembly 2 can further include a connecting wire protective cover 25, and the connecting wire protective cover 25 can be arranged in the connecting cavity 241 of the connecting pipe 24. The electrical connection can be arranged inside the connecting wire protective cover 25, while the refrigeration connection can be arranged in the connecting cavity 241 and outside the connecting wire protective cover 25. Therefore, the electrical connection and the refrigeration connection can be separated by the connecting wire protective cover 25 to avoid the influence between the refrigeration connection and the electrical connection and ensure the reliability of the equipment operation.

[0066] The present invention also provides a particle accelerator, which includes the above superconducting magnet device. The particle accelerator is applied to the medical field and can be used to accelerate therapeutic particles, and the accelerated therapeutic particles can be used to treat patients.

[0067] In addition, since the superconducting magnet device does not need to be provided with a complex pipeline structure for providing a large amount of refrigerant, the superconducting magnet device is basically not restricted by the pipeline, and the rotation angle of the superconducting magnet device is limited. For example, the existing superconducting magnet device can only achieve a 190° rotation due to the restriction of the complex pipeline. Therefore, when treating patients, for some positions where the rotation angle of the superconducting magnet device needs to be greater than 190°, it is necessary to move the treatment bed and rotate the superconducting magnet device in cooperation. The superconducting magnet device of the present invention can achieve a 360° rotation because it is basically not affected by the structures such as the pipeline matching the refrigerant. Therefore, the therapeutic beam emitted by the particle accelerator can be emitted in all directions, and the treatment bed does not need to be moved.

[0068] The present invention also provides a radiotherapy device, which includes the above particle accelerator.

[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principle and purpose of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the invention, and all these changes should fall within the protection scope of the claims of the present invention.

Claims

1. A superconducting magnet device, characterized in that: include: A magnet assembly (1) comprises an iron yoke (14), a coil frame (15), an iron core (16) and a superconducting coil (12); the iron yoke (14) is arranged to form a housing space (11); the coil frame (15) and the iron core (16) are arranged in the housing space (11), and the superconducting coil (12) is arranged between the coil frame (15) and the iron core (16); the iron yoke (14) is provided with a first connecting port (141) extending therethrough; the coil frame (15) is provided with a second connecting port (151), and the second connecting port (151) is used to connect the first connecting port (141) and the superconducting coil (12); the coil frame (15) is provided with two mounting holes. Grooves (152), each of the mounting grooves (152) is used to mount the superconducting coil (12); wherein the two mounting grooves (152) are spaced apart along the axial direction of the coil frame (15); the coil frame (15) is further provided with a boss (153) extending from the inner wall of the coil frame (15) toward the center of the coil frame (15), and the boss (153) is used to separate the two mounting grooves (152); the boss (153) is an annular structure, and the inner hollow portion of the boss (153) is connected to the two mounting grooves (152); the second connection port (151) extends from the outer wall of the coil frame (15) to the inner wall of the boss (153); The control component (2) is connected to the superconducting coil (12) through the first connection port (141) and the second connection port (151), and the control component (2) extends through the second connection port (151) to the inner hollow portion of the boss (153).

2. The superconducting magnet device according to claim 1, characterized in that: The axial direction of the superconducting coil (12) is the same as the axial direction of the coil frame, and no cold shield is arranged outside the iron yoke (14); the superconducting coil (12) is formed by winding a plurality of high-temperature superconducting tapes in a circumferential direction, the plurality of high-temperature superconducting tapes are arranged at intervals, and the height direction of the high-temperature superconducting tapes is parallel to the direction of the magnetic field generated by the superconducting coil after power is supplied.

3. The superconducting magnet device according to claim 2, characterized in that: The high-temperature superconducting tape is wound to form a multi-layer superconducting coil (12), and two adjacent layers of the superconducting coil (12) are spaced apart; The magnet assembly (1) further comprises a quench detection and protection unit (13), the quench detection and protection unit (13) being used to detect whether the superconducting coil (12) has a quench and to protect the superconducting coil (12) when a quench occurs; the quench detection and protection unit (13) is arranged between two adjacent layers of the superconducting coil (12).

4. The superconducting magnet device according to claim 3, characterized in that: The quench detection and protection units (13) are evenly distributed between two adjacent layers of superconducting coils (12), or the quench detection and protection units (13) are concentrated at a portion of the gap between two adjacent layers of superconducting coils (12).

5. The superconducting magnet device according to claim 3, characterized in that: The quench detection and protection unit (13) comprises a quench detection circuit and a quench protection circuit, the quench detection circuit being used to detect whether the superconducting coil (12) is quenched according to a change in a voltage difference, and the quench protection circuit being used to protect the superconducting coil (12) by quench heating.

6. The superconducting magnet device according to claim 2, characterized in that: The material of the high temperature superconducting tape is one or more of REBCO, YBCO, MgB2, Bi2212 or Bi2223.

7. The superconducting magnet device according to claim 1, characterized in that: The control component (2) comprises a refrigeration unit (21) and an electrical unit (22); the refrigeration unit (21) is used to provide a cold source for the superconducting coil (12) so that the temperature at the superconducting coil (12) reaches the working temperature of the superconducting coil (12); the electrical unit (22) is electrically connected to the superconducting coil (12) to control the superconducting coil (12); and the superconducting magnet device is not provided with a pipeline matching the refrigerant.

8. The superconducting magnet device according to claim 1, characterized in that: The iron yoke (14) is provided with a first connecting port (141) extending therethrough, the coil frame (15) is provided with a second connecting port (151), the second connecting port (151) being used to connect the first connecting port (141) and the superconducting coil (12), and the control component (2) is connected to the superconducting coil (12) via the first connecting port (141) and the second connecting port (151).

9. The superconducting magnet device according to claim 1, characterized in that: A D-shaped box (17) is arranged inside the iron core (16); the magnet assembly (1) is provided with a beam-emitting track (18); one end of the beam-emitting track (18) extends to the D-shaped box, and the other end of the beam-emitting track (18) passes through the magnet assembly (1); the D-shaped box (17) is used to accelerate therapeutic particles, and the therapeutic particles are ejected through the beam-emitting track (18) under the action of the magnetic field generated by the magnet assembly (1).

10. The superconducting magnet device according to claim 9, characterized in that: The superconducting coil (12) is installed in the accommodating space (11) via a suspension device, the suspension device is connected to the iron yoke (14), and the connection position between the suspension device and the iron yoke (14) is adjustable to adjust the position of the superconducting coil (12) and adjust the beam direction of the therapeutic particles.

11. The superconducting magnet device according to claim 7, characterized in that: The control assembly (2) further comprises a control box (23) and a connecting pipe (24), wherein the control box (23) is connected to the magnet assembly (1) via the connecting pipe (24); the refrigeration unit (21) comprises a cold head (211) and a refrigeration connection connected to the cold head (211), the electrical unit (22) comprises an electrical integration (221) and an electrical connection connected to the electrical integration (221), the cold head (211) and the electrical integration (221) are integrated on a first cover (231) of the control box (23), and the refrigeration connection second cover and the electrical connection are connected to the magnet assembly (1) through the connecting pipe (24).

12. The superconducting magnet device according to claim 11, characterized in that: A connection cavity (241) is formed in the connection pipe (24), and the control component (2) further comprises a connection wire protection cover (25), and the connection wire protection cover (25) is arranged in the connection cavity (241); the refrigeration connection is arranged in the connection cavity (241) and is located outside the connection wire protection cover (25); the electrical connection is arranged in the connection wire protection cover (25) and is separated from the refrigeration connection by the connection wire protection cover (25); And / or, the control box (23) comprises a second cover (232) made of a transparent material.

13. The superconducting magnet device according to claim 12, characterized in that: The second cover body (232) is made of carbon fiber reinforced polyimide composite material.

14. A particle accelerator, characterized in that: Comprising a superconducting magnet device as described in any one of claims 1-13.

15. A radiotherapy device, characterized in that: Comprising the particle accelerator of claim 14.

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