Forced flow cooling system for horizontal test of arc-shaped superconducting magnet

Abstract

The invention provides a forced flow cooling system for horizontal testing of an arc-shaped superconducting magnet, and relates to the technical field of superconducting magnet testing devices. The forced flow cooling system for the horizontal test of the arc-shaped superconducting magnet comprises a first transmission pipeline configured to transmit helium; a second transfer line configured to transfer liquid helium; the air inlet pipeline is respectively connected with the first transmission pipeline and the second transmission pipeline and is wound on the arc-shaped superconducting magnet; wherein the helium is used for cooling the arc-shaped superconducting magnet to a first preset temperature under the condition that the first transmission pipeline is communicated with the gas inlet pipeline and the second transmission pipeline is blocked from the gas inlet pipeline; and under the condition that the first transmission pipeline is disconnected from the gas inlet pipeline and the second transmission pipeline is communicated with the gas inlet pipeline, the liquid helium is used for cooling the arc-shaped superconducting magnet at the first preset temperature to a second preset temperature.

Description

Technical Field

[0001] The present disclosure relates to the technical field of superconducting magnet testing equipment, and more particularly, to a forced flow cooling system for horizontal testing of arc-shaped superconducting magnets. Background Art

[0002] Dry-cooled curved superconducting magnets are core components of the rotating gantry and miniaturized synchronizer rings used in medical ion therapy equipment. They significantly reduce the weight of the gantry and the size of the synchronizer rings. Traditional dry-cooled superconducting magnets are mostly linear and do not require fast-pulse operation. Cooling during horizontal testing is relatively simple, primarily using a GM refrigerator and zero-boil-off cooling of liquid helium. However, this approach presents several challenges in cooling dry-cooled curved superconducting magnets in fast-pulse operation. First, this cooling method generates significant AC losses on the outer walls and inner tubes of the helium tank, which not only affects the cooling efficiency but also the magnetic field quality within the effective magnetic field region of the superconducting magnet. Second, horizontal testing of superconducting magnets requires constant installation and removal of the thermostat, which compromises the sealing of the helium tank. Furthermore, zero-boil-off cooling of liquid helium cannot rapidly cool superconducting magnets with large cold masses, increasing time costs. Finally, using a GM refrigerator as a cooling source presents significant challenges in cooling multiple pairs of conduction-cooled current leads and high-current, air-cooled current leads. Summary of the Invention

[0003] In view of this, the present disclosure provides a forced flow cooling system for horizontal testing of arc-shaped superconducting magnets, which can solve at least one of the above technical problems.

[0004] The present disclosure provides a forced-flow cooling system for horizontal testing of an arc-shaped superconducting magnet, comprising: a first transmission pipeline configured to transmit helium; a second transmission pipeline configured to transmit liquid helium; and an air inlet pipeline connected to the first transmission pipeline and the second transmission pipeline, respectively, and wound around the arc-shaped superconducting magnet. When the first transmission pipeline is connected to the air inlet pipeline and the second transmission pipeline is disconnected from the air inlet pipeline, the helium is used to cool the temperature of the arc-shaped superconducting magnet to a first preset temperature. When the first transmission pipeline is disconnected from the air inlet pipeline and the second transmission pipeline is connected to the air inlet pipeline, the liquid helium is used to cool the arc-shaped superconducting magnet from the first preset temperature to a second preset temperature.

[0005] According to an embodiment of the present disclosure, it also includes: a return air pipeline connected to the intake air pipeline, configured to recover the helium after cooling the arc-shaped superconducting magnet; a vacuum pump assembly, arranged on the return air pipeline, configured to regulate the pressure in the intake air pipeline and the return air pipeline to the saturated vapor pressure of liquid helium at the target temperature, so as to cool the temperature of the arc-shaped superconducting magnet from the second preset temperature to the target temperature.

[0006] According to an embodiment of the present disclosure, the system further includes: a liquid helium phase separator connected to the second transmission pipeline and configured to separate helium from the transmitted liquid helium.

[0007] According to an embodiment of the present disclosure, the system further includes: a heat exchanger, which is arranged on the intake pipeline and the return pipeline, connected to the output end of the liquid helium phase separator, and is configured to exchange heat between the liquid helium in the intake pipeline and the helium at the target temperature in the return pipeline.

[0008] According to an embodiment of the present disclosure, it also includes: a valve box, which is provided with a accommodating space and is configured to provide a vacuum environment for the first transmission pipeline and the second transmission pipeline; a valve box cold screen, which is sleeved on the inner side of the valve box and is configured to reduce radiation heat leakage of the fluid.

[0009] According to an embodiment of the present disclosure, the valve box further includes: a third transmission pipeline configured to transmit helium at a third preset temperature and a cooling lead for supplying power to the arc-shaped superconducting magnet, wherein the third preset temperature is greater than the second preset temperature and the third preset temperature is less than the first preset temperature.

[0010] According to an embodiment of the present disclosure, the lead includes: a first lead configured to supply power to an arc-shaped superconducting magnet in a rotating gantry; a second lead configured to supply power to an arc-shaped superconducting magnet in a synchronization ring; and a third transmission pipeline includes: a first sub-pipeline configured to cool the first lead; and a second sub-pipeline configured to cool the second lead.

[0011] According to an embodiment of the present disclosure, it also includes: a thermostat with a housing space therein, configured to provide a stable temperature environment for the arc-shaped superconducting magnet; a thermostat cold shield, sleeved on the inner side of the thermostat, configured to reduce radiation heat leakage of the arc-shaped superconducting magnet.

[0012] According to an embodiment of the present disclosure, the third transmission pipeline further includes: a third sub-pipeline, configured to cool the valve box cold screen and the thermostat cold screen; wherein, one end of the first sub-pipeline after winding the first lead is connected to the third sub-pipeline.

[0013] According to an embodiment of the present disclosure, the system further includes: a helium cryogenic system configured to output helium gas and liquid helium and to recycle helium gas.

[0014] The forced flow cooling system for horizontal testing of arc-shaped superconducting magnets provided in accordance with the embodiments of the present disclosure has at least the following beneficial effects:

[0015] By switching and controlling the first and second transmission pipelines and the air inlet line, efficient forced-flow cooling of the arc-shaped superconducting magnet is achieved at different temperature stages, effectively shortening the cooling time and improving testing efficiency. Furthermore, the use of helium for the primary initial cooling task significantly reduces the use of liquid helium, aligning with the development trend of green energy conservation. This structural design addresses the shortcomings of traditional point-contact cooling, such as low efficiency, inability to achieve forced-flow cooling, and long cooling times, achieving an efficient, energy-saving, safe, and controllable multi-stage cooling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram showing the structure of a forced flow cooling system for horizontal testing of an arc-shaped superconducting magnet according to an embodiment of the present disclosure is shown;

[0018] Figure 2 Schematically shows a schematic diagram of a pre-cooling cycle of an arc-shaped superconducting magnet according to an embodiment of the present disclosure;

[0019] Figure 3 Schematically shows a schematic diagram of a cooling cycle of an arc-shaped superconducting magnet according to an embodiment of the present disclosure;

[0020] Figure 4 Schematically shows a schematic diagram of a cold screen cooling cycle according to an embodiment of the present disclosure;

[0021] Figure 5 Schematically shows a schematic diagram of a first lead cooling cycle according to an embodiment of the present disclosure;

[0022] Figure 6 A schematic diagram of a second lead cooling cycle according to an embodiment of the present disclosure is shown schematically. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, in the following description, descriptions of well-known systems and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0024] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise," "include," etc. used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0025] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0026] When expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0027] Figure 1 The structure of a forced flow cooling system for horizontal testing of arc-shaped superconducting magnets according to an embodiment of the present disclosure is schematically shown.

[0028] like Figure 1 As shown, this embodiment is a forced flow cooling system for horizontal testing of an arc-shaped superconducting magnet, comprising:

[0029] The first transfer line 13 is configured to transfer helium.

[0030] The second transfer line 12 is configured to transfer liquid helium.

[0031] The air inlet pipeline 20 is connected to the first transmission pipeline 13 and the second transmission pipeline 12 respectively, and is wound around the arc-shaped superconducting magnet 37 .

[0032] When the first transmission line 13 is connected to the air inlet line 20 and the second transmission line 12 is blocked from the air inlet line 20 , the helium gas is used to cool the arc-shaped superconducting magnet 37 to a first preset temperature.

[0033] When the first transfer line 13 is disconnected from the gas inlet line 20 and the second transfer line 12 is connected to the gas inlet line 20 , liquid helium is used to cool the arc-shaped superconducting magnet 37 at the first preset temperature to a second preset temperature.

[0034] In an embodiment of the present disclosure, the pneumatic control valve 25 provided on the first transfer line 13 is controlled to connect the first transfer line 13 with the gas inlet line 20. Furthermore, the pneumatic control valve 26 provided on the second transfer line 12 is controlled to block the second transfer line 12 from the gas inlet line 20. At this time, the helium gas transported by the first transfer line 13 is used to cool the arc-shaped superconducting magnet 37 from room temperature to a first preset temperature. Furthermore, the pneumatic control valve 25 provided on the first transfer line 13 is controlled to block the first transfer line 13 from the gas inlet line 20. Furthermore, the pneumatic control valve 26 provided on the second transfer line 12 is controlled to connect the second transfer line 12 with the gas inlet line 20. At this time, the liquid helium transported by the second transfer line 12 is used to cool the arc-shaped superconducting magnet 37 from the first preset temperature to the second preset temperature.

[0035] In some possible embodiments, the first preset temperature may be 80 K, and the second preset temperature may be 4.5 K. The temperature of the helium gas transported by the first transmission line 13 may be 80 K, and the temperature of the liquid helium transported by the second transmission line 12 may be 4.5 K.

[0036] According to the embodiments of the present disclosure, by switching and controlling the first and second transmission lines 13, 12, and the air inlet line 20, efficient forced-flow cooling of the arc-shaped superconducting magnet 37 at different temperature stages is achieved, effectively shortening the cooling time and improving testing efficiency. This overcomes the shortcomings of traditional point-contact cooling, such as low efficiency, inability to achieve forced-flow cooling, and long cooling times, and achieves an efficient, energy-saving, safe, and controllable multi-stage cooling process.

[0037] Continue as Figure 1 As shown, the system also includes:

[0038] The return gas line 21 is connected to the inlet gas line 20 and is configured to recover the helium gas after cooling the arc-shaped superconducting magnet 37 .

[0039] The vacuum pump assembly 9 is provided on the return air line 21 and is configured to adjust the pressure at the rear end of the throttle valve 32 provided on the intake air line 20 to the saturated vapor pressure of liquid helium at the target temperature, so as to cool the temperature of the arc-shaped superconducting magnet 37 from the second preset temperature to the target temperature.

[0040] In the embodiment of the present disclosure, due to the existence of radiation heat leakage and conduction heat leakage, as well as the Joule heat generated by power supply during the test and the AC loss generated by the superconducting magnet 37, the liquid helium in the intake pipe 20 absorbs heat after passing through the superconducting magnet 37, evaporates, and finally enters the return air pipe 21 in the form of helium.

[0041] By installing a vacuum pump assembly 9 on the return air line 21, when the temperature of the arc-shaped superconducting magnet 37 cools to a second preset temperature, the pneumatic control valve 30 provided on the bypass line 19 of the intake air line 20 is blocked. The throttle valve 32 provided on the intake air line 20 is opened, and the pressure behind the throttle valve 32 is regulated to keep the temperature of the liquid helium delivered to the arc-shaped superconducting magnet through the intake air line 20 at the target temperature.

[0042] According to the embodiments of the present disclosure, liquid helium at a lower temperature can be obtained, providing a lower test temperature for superconducting magnets. For superconducting magnets operating in fast pulses, the probability of superconducting magnets quenching due to temperatures exceeding the critical temperature during testing is reduced.

[0043] In some possible embodiments, the target temperature may be 3K, at which the superconducting magnet may be cooled more efficiently by forced flow.

[0044] Continue as Figure 1 As shown, the system further includes a liquid helium phase separator 23 connected to the second transmission pipeline 12 and configured to separate helium from the transmitted liquid helium.

[0045] In the embodiment of the present disclosure, one end of the liquid helium phase separator 23 is connected to the second transmission pipeline 12, the other end of the liquid helium phase separator 23 is connected to the pressure-stabilizing pipeline 22, and another end of the liquid helium phase separator 23 is connected to the air inlet pipeline 20. By providing the liquid helium phase separator 23 in this embodiment, it is possible to separate the vaporized low-temperature helium gas from the liquid helium transported by the second transmission pipeline 12, and to transport the separated helium gas through the pressure-stabilizing pipeline 22 to maintain a stable pressure in the liquid helium separator 23.

[0046] Furthermore, a pneumatic regulating valve 31 is provided on the pressure stabilizing pipeline 22 , and the connection or blocking of the pressure stabilizing pipeline 22 is controlled by controlling the pneumatic regulating valve 31 .

[0047] Continue as Figure 1 As shown, the system further includes: a heat exchanger 24, which is provided on the intake pipeline 20 and the return pipeline 21, connected to the output end of the liquid helium phase separator 23, and is configured to exchange heat between the liquid helium in the intake pipeline 20 and the helium at the target temperature in the return pipeline 21.

[0048] In the embodiment of the present disclosure, when the temperature of the arc-shaped superconducting magnet 37 cools to the second preset temperature, the pneumatic control valve 30 is closed and the throttle valve 32 provided on the air intake line is opened. Liquid helium transmitted through the second transmission line 12 then passes through the heat exchanger 24 and the throttle valve 32 to cool the arc-shaped superconducting magnet 37. Furthermore, when the vacuum pump assembly 9 regulates the pressure after the throttle valve 32 to the saturated vapor pressure of liquid helium at the target temperature, cooling the temperature of the arc-shaped superconducting magnet 37 from the second preset temperature to the target temperature, the temperature of the helium in the return air line also reaches the target temperature. At this point, the temperature of the liquid helium entering the heat exchanger 24 on the air intake line 20 exceeds the target temperature. The provision of the heat exchanger 24 allows the temperature of the liquid helium output from the air intake line 20 through the heat exchanger 24 to be rapidly reduced, and the throttle valve 32 allows the liquid helium to be converted to the target temperature with higher efficiency.

[0049] Continue as Figure 1 As shown, the system also includes:

[0050] The valve box 3 is provided with an accommodating space and is configured to provide a vacuum environment for the first transmission pipeline 13 and the second transmission pipeline 12 .

[0051] The valve box cold shield 33 is sleeved on the inner side of the valve box 3 and is configured to reduce the radiation heat leakage of helium gas and liquid helium.

[0052] Continue as Figure 1 As shown, the valve box 3 also includes:

[0053] The third transmission pipeline 14 is configured to transmit helium at a third preset temperature and cool the leads for supplying power to the arc-shaped superconducting magnet 37 . The third preset temperature is greater than the second preset temperature and is less than the first preset temperature.

[0054] Furthermore, the leads include:

[0055] The first lead 35 , provided in the thermostat 5 , is configured to supply power to the arc-shaped superconducting magnet 37 within the rotating gantry.

[0056] The second lead 36 , provided in the thermostat 5 , is configured to supply power to the arc-shaped superconducting magnet 37 within the synchronization ring.

[0057] The third transmission pipeline 14 includes:

[0058] The first sub-line 16 is configured to cool the first lead 35 .

[0059] The second sub-line 17 is configured to cool the second lead 36 .

[0060] In the embodiments of the present disclosure, horizontal testing of two types of dry-cooled arc-shaped superconducting magnets can be taken into account, and cooling of two current leads corresponding to the two types of superconducting magnets can be taken into account, which greatly saves testing costs.

[0061] Furthermore, the system also includes:

[0062] The air heat exchanger 6 is provided on the pressure stabilizing pipeline 22 and is used to heat the vaporized helium.

[0063] The electric heater 7 is provided on the return gas pipeline 21 and is used to heat the helium gas transported by the return gas pipeline 21 .

[0064] The mass flow detector 8 is provided on the return air line 21 and connected to the output end of the electric heater 7, and is used to monitor the flow of helium in the return air line 21 and calculate the AC loss of the arc superconducting magnet 37 during the horizontal test.

[0065] The mass flow controller 11 is used to control the flow of helium gas for cooling the second lead 36 .

[0066] The pressure reducing valve 10 is connected to the input end of the mass flow controller 11 and is used to reduce the high-pressure helium gas cooling the second lead 36 to low-pressure helium gas.

[0067] Continue as Figure 1 As shown, the system also includes:

[0068] The thermostat 5 has a receiving space therein and is configured to provide a stable temperature environment for the arc-shaped superconducting magnet 37;

[0069] The thermostat cold shield 34 is sleeved on the inner side of the thermostat 5 and is configured to reduce radiation heat leakage of the arc-shaped superconducting magnet 37 .

[0070] Furthermore, the third transmission pipeline 14 further includes:

[0071] The third sub-pipeline 18 is configured to cool the valve box cold shield 33 and the thermostat cold shield 34;

[0072] Among them, after the end of the first sub-pipeline 16 after winding the first lead 35 is connected to the third sub-pipeline 18, the helium in the two sub-pipelines enters the return gas pipeline 15. At this time, the helium is used to cool the thermostat cold shield 34 and the valve box cold shield 33.

[0073] The helium cryogenic system 1 is configured to output helium gas and liquid helium and to recover helium gas.

[0074] In some possible embodiments, the temperature of the helium gas transported by the first transmission pipeline 13 may be 80K, the temperature of the liquid helium gas transported by the second transmission pipeline 12 may be 4.5K, the temperature of the helium gas transported by the third transmission pipeline 14 may be 50K, the target temperature of the liquid helium is 3K, and the temperature of the helium gas recovered by the return gas pipeline 15 may be 75K.

[0075] Figure 2 The figure schematically shows a pre-cooling cycle diagram of an arc-shaped superconducting magnet according to an embodiment of the present disclosure.

[0076] like Figure 2 As shown, pneumatic control valve 25 is opened, and the 80K helium gas produced by helium cryogenic system 1 enters inlet pipe 20 through first transmission line 13. It then passes through arc-shaped superconducting magnet 37 for pre-cooling, and then returns to helium cryogenic system 1 through return pipe 21. When the temperature of the superconducting magnet drops from 300K to 80K, pneumatic control valve 25 is closed, and heater 7 remains on throughout the process.

[0077] Figure 3 The figure schematically shows a cooling cycle diagram of an arc-shaped superconducting magnet according to an embodiment of the present disclosure.

[0078] like Figure 3 As shown, when the superconducting magnet temperature reaches 80K, pneumatic control valve 26 is opened, and pneumatic control valve 31 is kept open. 4.5K liquid helium produced by helium cryogenic system 1 enters liquid helium phase separator 23 via second transfer line 12. A portion of the vaporized helium returns to helium cryogenic system 1 via pressure-stabilizing line 22, maintaining the pressure stability in liquid helium phase separator 23. During the initial cooling process, pneumatic control valve 30 is opened, and 4.5K liquid helium enters intake line 20 via bypass line 19. It then passes through curved superconducting magnet 37 for further cooling before returning to helium cryogenic system 1 via return line 21. When the superconducting magnet temperature drops to 4.5K, cryogenic control valve 30 is closed, throttle valve 32 is opened, and vacuum pump assembly 9 is started until the superconducting magnet temperature drops to 3K, at which point horizontal testing begins. Heater 7 remains on throughout the entire process, and this cooling cycle is restarted after the magnet pre-cooling cycle is shut down, remaining on throughout the subsequent horizontal testing.

[0079] Figure 4 A schematic diagram of a cold screen cooling cycle according to an embodiment of the present disclosure is shown schematically.

[0080] like Figure 4 As shown, the pneumatic regulating valve 29 is opened, and the 50K helium gas generated by the helium cryogenic system 1 enters the third sub-pipeline 18 through the third transmission pipeline 14, and then enters the thermostat 5, first cools the thermostat cold shield 34, then returns to the valve box 3, cools the valve box cold shield 33, and finally returns to the helium cryogenic system 1 through the 75K return gas pipeline 15.

[0081] This cooling cycle is started at the same time as the magnet pre-cooling cycle is started, and remains on during subsequent magnet cooling cycles and level tests.

[0082] Figure 5 A schematic diagram of a first lead cooling cycle according to an embodiment of the present disclosure is shown schematically.

[0083] like Figure 5 As shown, the pneumatic regulating valve 27 is opened, and the 50K helium gas generated by the helium cryogenic system 1 enters the first sub-pipeline 16 through the third transmission pipeline 14, is then cooled through the first lead 35, and then flows into the third sub-pipeline 18. The third sub-pipeline 18 cools the thermostat cold shield 34 and the valve box cold shield 33, and finally returns to the helium cryogenic system 1 through the 75K return gas pipeline 15.

[0084] This cooling cycle is only started when the arc-shaped superconducting magnet 37 used in the rotating frame is horizontally tested, and is started at the same time as the cold shield cooling cycle, and is kept on during subsequent magnet cooling cycles and horizontal tests.

[0085] Figure 6 A schematic diagram of a second lead cooling cycle according to an embodiment of the present disclosure is shown schematically.

[0086] like Figure 6 As shown, pneumatic regulating valve 28 is opened, and 50K helium gas generated by helium cryogenic system 1 enters second sub-pipeline 17 through third transmission pipeline 14, and is then cooled through second lead line 36. After passing through second lead line 36, the 50K helium gas is heated to room temperature helium gas, which is then returned to helium cryogenic system 1 through pressure reducing valve 10 and mass flow controller 11.

[0087] This cooling cycle is only turned on when the dry-cooled superconducting magnet 37 used in the miniaturized synchronization ring is horizontally tested, and is turned on at the same time as the cold shield cooling cycle, and is always turned on during subsequent magnet cooling cycles and horizontal tests.

[0088] In the disclosed embodiments, the flow of cryogenic helium and liquid helium can be controlled by adjusting the opening of a pneumatic control valve, thereby increasing the cooling rate of the superconducting magnet and achieving rapid cooling. This significantly reduces the time and cost of cooling this type of large cooling mass superconducting magnet. Furthermore, the system can simultaneously perform horizontal testing of two types of arc-shaped superconducting magnets and cool the two current leads corresponding to these two types of superconducting magnets, significantly reducing testing costs.

[0089] Those skilled in the art will appreciate that various combinations and / or combinations of features described in the various embodiments and / or claims of this disclosure may be made, even if such combinations or combinations are not explicitly described in this disclosure. In particular, various combinations and / or combinations of features described in the various embodiments and / or claims of this disclosure may be made, without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0090] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A forced flow cooling system for horizontal testing of arc-shaped superconducting magnets, characterized in that: include: a first transfer line configured to transfer helium; a second transfer line configured to transfer liquid helium; an air inlet pipeline, connected to the first transmission pipeline and the second transmission pipeline respectively, and wound around the arc-shaped superconducting magnet; Wherein, when the first transmission line is connected to the air inlet line and the second transmission line is blocked from the air inlet line, the helium gas is used to cool the temperature of the arc-shaped superconducting magnet to a first preset temperature; When the first transfer line is disconnected from the gas inlet line and the second transfer line is connected to the gas inlet line, the liquid helium is used to cool the arc-shaped superconducting magnet at the first preset temperature to a second preset temperature.

2. The system according to claim 1, wherein: Also includes: a return gas pipeline connected to the inlet gas pipeline and configured to recover the helium gas after cooling the arc-shaped superconducting magnet; A vacuum pump assembly is provided on the return air line and is configured to regulate the pressures on the intake line and the return air line to the saturated vapor pressure of liquid helium at a target temperature, so as to cool the temperature of the arc-shaped superconducting magnet from the second preset temperature to the target temperature.

3. The system according to claim 2, characterized in that Also includes: The liquid helium phase separator is connected to the second transmission line and is configured to separate helium gas from the transmitted liquid helium.

4. The system according to claim 3, characterized in that Also includes: A heat exchanger is provided on the air inlet pipeline and the air return pipeline, connected to the output end of the liquid helium phase separator, and configured to exchange heat between the liquid helium in the air inlet pipeline and the helium at the target temperature in the air return pipeline.

5. The system according to claim 1, wherein: Also includes: a valve box having an accommodating space and configured to provide a vacuum environment for the first transmission pipeline and the second transmission pipeline; The valve box cold shield is sleeved on the inner side of the valve box and is configured to reduce the radiation heat leakage of the fluid.

6. The system according to claim 5, characterized in that The valve box also includes: The third transmission pipeline is configured to transmit helium at a third preset temperature and cool the leads that supply power to the arc-shaped superconducting magnet. The third preset temperature is greater than the second preset temperature and is less than the first preset temperature.

7. The system according to claim 6, characterized in that The lead includes: a first lead configured to supply power to the arc-shaped superconducting magnet within the rotating gantry; a second lead configured to supply power to the arc-shaped superconducting magnet within the synchronization ring; The third transmission pipeline includes: a first sub-line configured to cool the first lead; The second sub-line is configured to cool the second lead.

8. The system according to claim 7, characterized in that Also includes: a thermostat having an accommodation space therein and configured to provide a stable temperature environment for the arc-shaped superconducting magnet; The thermostat cold shield is sleeved on the inner side of the thermostat and is configured to reduce the radiation heat leakage of the arc-shaped superconducting magnet.

9. The system according to claim 8, characterized in that The third transmission pipeline further includes: a third sub-pipeline configured to cool the valve box cold shield and the thermostat cold shield; Wherein, one end of the first sub-pipeline after the first lead is wound is connected to the third sub-pipeline.

10. The system according to claim 1, wherein: Also includes: A helium cryogenic system is configured to output the helium gas and liquid helium and to recover the helium gas.

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