Conduction cooling superconducting magnet testing device

Abstract

The utility model provides a conduction cooling superconducting magnet testing device, which belongs to the field of superconducting testing and comprises a GM refrigerating machine, an outer Dewar vacuum cavity, an outer Dewar cold shield layer, a superconducting magnet loading disc, a superconducting magnet pull rod, a superconducting magnet cold conduction belt, a room temperature plug-in and a top flange. According to the utility model, a test space in a low-temperature environment can be provided, and a test space in a room-temperature environment can also be provided.

Description

Technical Field

[0001] The utility model belongs to the field of superconducting testing, and in particular relates to a conduction cooling superconducting magnet testing device. Background Art

[0002] There are many existing superconducting magnet testing devices, such as Chinese patent application CN202110098031.5 (a direct-cooling high-temperature superconducting magnet test platform and assembly method), which only includes a refrigerator and an external dewar, and does not include a room temperature test dewar. Chinese patent application CN201610980439.4 (a dynamic measurement device and measurement method for superconducting magnets at low temperatures) only includes a measurement workbench and a magnetic measurement tooling mechanism, and does not include a dewar device.

[0003] The above patent application has the following technical problems:

[0004] 1. It cannot meet the test requirements of conduction-cooled magnets in low-temperature environments;

[0005] 2. It cannot provide testing space for room temperature environment, cannot provide testing space for low temperature environment, or cannot provide testing space for both room temperature environment and low temperature environment. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a conduction-cooled superconducting magnet testing device, including a GM refrigerator, an external Dewar vacuum chamber, an external Dewar cold shield layer, a superconducting magnet loading plate, a superconducting magnet pull rod, a superconducting magnet cooling belt, a room temperature plug-in and a top flange, which can provide a test space in a low-temperature environment and also provide a test space in a room temperature environment.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A conduction-cooled superconducting magnet test device comprises a GM refrigerator, an outer Dewar vacuum chamber, an outer Dewar cold shield layer, a superconducting magnet loading plate, a superconducting magnet pull rod, a superconducting magnet cold belt, a room temperature plug-in and a top flange, wherein the part of the GM refrigerator inserted into the test device comprises a primary cold head and a secondary cold head; it comprises a plurality of test interfaces, namely a vacuum test interface, a temperature test interface, a quench monitoring interface, an excitation and demagnetization interface; the outer Dewar vacuum chamber and the top flange are connected by O-ring sealing and bolts, and the outer Dewar cold shield layer and the superconducting magnet device are connected by O-ring sealing and bolts. The carriers are hoisted on the top flange by superconducting magnet pull rods made of G10 glass fiber rods. The first-stage cold head and the second-stage cold head of the GM refrigerator are installed on the top flange. The first-stage cold head and the second-stage cold head extend into the outer Dewar vacuum chamber and are connected to the outer Dewar cold shield layer and the superconducting magnet cooling belt respectively. The superconducting magnet as the test object is installed on the superconducting magnet loading plate, and the cooling capacity is transferred by connecting the superconducting magnet cooling belt. All test cables on the superconducting magnet are led out through the test interface reserved on the top flange and connected to external test instruments.

[0009] Furthermore, the conduction-cooled superconducting magnet testing device meets the requirements for extensive testing of conduction-cooled superconducting magnets with a diameter of less than 500 mm and a height of less than 500 mm in a 4.2K low-temperature environment.

[0010] Furthermore, the sensors required in the test are installed on the superconducting magnet coils, and the communication cables connected to the sensors are connected to external control instruments through the reserved interface of the top flange of the conduction-cooled superconducting magnet test device, and data are collected and results are exported through the external control instruments.

[0011] Furthermore, the cooling power of the superconducting magnet is provided by the secondary cold head of the refrigerator, and the cooling power of the outer Dewar cold shield layer is provided by the primary cold head; the secondary cold head conducts cold energy through the superconducting magnet cooling belt, and the temperature of the secondary cold head is 4.2K; the primary cold head conducts cold energy through the connecting top flange, and the temperature of the primary cold head is 50K.

[0012] Furthermore, the current lead wire, the temperature sensor lead wire, the pressure measurement lead wire, and the quench monitoring lead wire of the superconducting magnet are led out through the test interface of the top flange.

[0013] Furthermore, the room temperature plug-in is a vacuum composite chamber component, which realizes a room temperature test environment. The room temperature test environment supports the insertion of the room temperature plug-in, and the room temperature plug-in is inserted through the test hole reserved on the top flange; when the room temperature plug-in is not used, the test hole is sealed with a flange cover.

[0014] Furthermore, in a low-temperature test environment, the room-temperature plug-in is taken out, and a low-temperature test rod is installed at the test interface of the top flange.

[0015] Beneficial effects:

[0016] 1. The utility model is a reusable conduction-cooled superconducting magnet testing device, which has the advantages of versatility and rapid testing for conduction-cooled magnet testing.

[0017] 2. The utility model is equipped with a room temperature plug-in, which can provide a test space in a low temperature environment, and can also provide a test space in a room temperature environment.

[0018] 3. The test device of the utility model provides a variety of interfaces, which can carry out various superconducting magnet tests such as temperature, vacuum, excitation, quenching, and demagnetization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a conduction-cooled superconducting magnet testing device of the utility model;

[0020] Figure 2 This is an appearance diagram of a conduction-cooled superconducting magnet testing device of the utility model;

[0021] Figure 3 It is a top view of a conduction-cooled superconducting magnet testing device of the utility model;

[0022] Figure 4 It is a cross-sectional view of a conduction-cooled superconducting magnet testing device of the utility model;

[0023] Figure 5 This is a detailed picture of the room temperature plug-in;

[0024] Figure 6 This is a schematic diagram of the test interface. DETAILED DESCRIPTION

[0025] like Figure 1 As shown, a conduction-cooled superconducting magnet test device of the utility model comprises a GM refrigerator 1, an external Dewar vacuum chamber 2, an external Dewar cold shield layer 3, a superconducting magnet loading plate 4, a superconducting magnet pull rod 5, a superconducting magnet conductive cooling belt 6, a room temperature plug-in 7 and a top flange 8, wherein the part of the GM refrigerator 1 inserted into the test device comprises a primary cold head 9 and a secondary cold head 10. The outer Dewar vacuum chamber 2 and the top flange 8 are connected by O-ring sealing and bolts. The outer Dewar cold shield layer 3 and the superconducting magnet loading plate 4 are hoisted on the top flange 8 through the superconducting magnet pull rod 5 made of G10 glass fiber rod. The first-stage cold head 9 and the second-stage cold head 10 of the GM refrigerator 1 are installed on the top flange 8. The first-stage cold head 9 and the second-stage cold head 10 extend into the outer Dewar vacuum chamber 2 and are respectively connected to the outer Dewar cold shield layer 3 and the superconducting magnet cold belt 6; the superconducting magnet as the test object is installed on the superconducting magnet loading plate 4, and the cold is transferred by connecting the superconducting magnet cold belt 6; all test cables on the superconducting magnet are led out through the test interface reserved on the top flange 8 and connected to external test instruments.

[0026] The utility model can meet the extensive testing of conduction-cooled superconducting magnets with a diameter of less than 500 mm and a height of less than 500 mm in a 4.2k low-temperature environment, including temperature testing, vacuum testing, excitation field rising testing, magnetic field strength and uniformity testing after excitation, field changing testing, demagnetization testing, and quench testing.

[0027] like Figure 2-Figure 4 As shown, the test device of the utility model has a variety of test interfaces, including a vacuum test interface, a temperature test interface, a quench monitoring interface, an excitation and demagnetization interface, etc.

[0028] The sensors required in the test are usually installed on the superconducting magnet coils, and the communication cables connected to the sensors can be connected to external control instruments through the reserved interface of the top flange 8 of the test device, and data can be collected and results can be exported through the external control instruments.

[0029] The working process of the utility model is as follows: when starting to use the device to test the magnet, it is necessary to first lift out the top flange 8, unload the cylindrical part of the outer Dewar cold shield layer 3, unload the superconducting magnet loading disk 4, install the superconducting magnet on the superconducting magnet loading disk 4, then install the superconducting magnet loading disk 4 to the superconducting magnet pull rod 5, then install the outer Dewar cold shield layer 3, and finally install it on the outer Dewar vacuum chamber 2 by lifting the top flange 8.

[0030] The cooling power of the superconducting magnet is provided by the secondary cold head 10 of the refrigerator, and the cooling power of the outer Dewar cold shield layer 3 is provided by the primary cold head 9, and the cooling is conducted through the superconducting magnet cold belt 6. The current lead, temperature sensor lead, pressure measurement lead, quench monitoring lead, etc. of the superconducting magnet are led out through the interface of the top flange 8.

[0031] like Figure 5 As shown, the room temperature plug-in 7 in the present invention is a vacuum composite chamber component, and a room temperature test environment can be realized by installing the room temperature plug-in 7. The provided room temperature test environment supports the insertion of a test rod; when only a low temperature test environment is needed, the room temperature plug-in 7 can be taken out, and a low temperature test rod can be installed at the test interface of the top flange 8. The test rod can be used inside the room temperature plug-in 7 for testing and experiments.

[0032] like Figure 6 As shown, the test interface of the top flange 8 includes: a first test interface 11 for conducting the cooling magnet current lead lead, a second test interface 12, a third test interface 13, and a fourth test interface 14 for leading out sensor cables for temperature monitoring, air pressure monitoring, and quench monitoring, a fifth test interface 15 is a reserved interface, and a sixth test interface 16 is used for installing the room temperature plug-in 7.

[0033] The utility model can provide two test modes: low temperature test environment and room temperature test environment. The low temperature refers to 4K temperature, and the room temperature refers to 300K temperature.

[0034] The testing device of the utility model can be applied to the measurement of liquid helium cooling superconducting magnets after appropriate modification.

Claims

1. A conduction-cooled superconducting magnet testing device, characterized in that: It includes a GM refrigerator, an outer Dewar vacuum chamber, an outer Dewar cold shield layer, a superconducting magnet loading plate, a superconducting magnet pull rod, a superconducting magnet cold belt, a room temperature plug-in and a top flange. The part of the GM refrigerator inserted into the test device includes a first-stage cold head and a second-stage cold head; it includes multiple test interfaces, namely a vacuum test interface, a temperature test interface, a quench monitoring interface, an excitation and demagnetization interface; the outer Dewar vacuum chamber and the top flange are connected by O-ring sealing and bolts, and the outer Dewar cold shield layer and the superconducting magnet loading plate are connected by G1 0The superconducting magnet pull rod made of fiberglass rod is hoisted on the top flange. The first-stage cold head and the second-stage cold head of the GM refrigerator are installed on the top flange. The first-stage cold head and the second-stage cold head extend into the outer Dewar vacuum chamber and are connected to the outer Dewar cold shield layer and the superconducting magnet cold belt respectively. The superconducting magnet as the test object is installed on the superconducting magnet loading disk, and the cold energy is transferred by connecting the superconducting magnet cold belt. All test cables on the superconducting magnet are led out through the test interface reserved on the top flange and connected to external test instruments.

2. A conduction-cooled superconducting magnet testing device according to claim 1, characterized in that: The conduction-cooled superconducting magnet testing device meets the requirements of extensive testing of conduction-cooled superconducting magnets with a diameter of less than 500 mm and a height of less than 500 mm in a 4.2K low-temperature environment.

3. A conduction-cooled superconducting magnet testing device according to claim 1, characterized in that: The sensors required in the test are installed on the superconducting magnet coils. The communication cables connecting the sensors are connected to external control instruments through the reserved interface on the top flange of the conduction-cooled superconducting magnet test device. Data is collected and results are exported through the external control instruments.

4. A conduction-cooled superconducting magnet testing device according to claim 1, characterized in that: The cooling power of the superconducting magnet is provided by the secondary cold head of the refrigerator, and the cooling power of the outer Dewar cold shield layer is provided by the primary cold head; the secondary cold head conducts cold energy through the superconducting magnet cooling belt, and the temperature of the secondary cold head is 4.2K; the primary cold head conducts cold energy through the connecting top flange, and the temperature of the primary cold head is 50K.

5. The conduction-cooled superconducting magnet testing device according to claim 1, characterized in that: The current lead wire of the superconducting magnet, the temperature sensor lead wire, the pressure measurement lead wire, and the quench monitoring lead wire are led out through the test interface of the top flange.

6. A conduction-cooled superconducting magnet testing device according to claim 1, characterized in that: The room temperature plug-in is a vacuum composite chamber component, which realizes a room temperature test environment. The room temperature test environment supports the insertion of the room temperature plug-in, and the room temperature plug-in is inserted through the test hole reserved on the top flange; when the room temperature plug-in is not used, the test hole is sealed with a flange cover.

7. A conduction-cooled superconducting magnet testing device according to claim 6, characterized in that: In the low temperature test environment, remove the room temperature plug-in and install the low temperature test rod at the test interface of the top flange.

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