Superconducting magnet horizontal test thermostat

Abstract

The invention provides a superconducting magnet horizontal test thermostat, which is applied to arc-shaped deflection superconducting magnets of various sizes and specifications, and comprises an outer Dewar used for providing a vacuum test environment for the arc-shaped deflection superconducting magnets; the cold shield is used for reducing radiation heat leakage of the arc-shaped deflection superconducting magnet; the liquid helium service assembly is arranged above the outer Dewar flask and used for inputting liquid helium into the outer Dewar flask in a liquid helium soaking cooling mode to cool the arc-shaped deflection superconducting magnet; the refrigerating machine is arranged above the outer Dewar flask and used for providing cooling capacity for the interior of the outer Dewar flask in a conduction cooling mode or maintaining the liquid helium temperature in the outer Dewar flask in a liquid helium soaking cooling mode; the temperature hole bent pipe transversely penetrates through the inner part of the outer Dewar, penetrates through the arc-shaped deflection superconducting magnet and is used for carrying out a horizontal test on the arc-shaped deflection superconducting magnet; the supporting assembly is connected with the outer Dewar and used for adjusting the postures of the outer Dewar and the arc-shaped deflection superconducting magnet.

Description

Technical Field

[0001] The present disclosure relates to the technical field of cryostats, and more particularly, to a superconducting magnet horizontal test cryostat Background Art

[0002] At present, the medical compact synchrotron uses arc-shaped deflection superconducting magnets on the rotating Gantry and synchronization rings. These superconducting magnets need to undergo vertical and horizontal tests before they are officially put into operation. The vertical test mainly uses a vertical test dewar to perform a liquid helium low-temperature immersion test. Although the excitation training test can be performed, it cannot simulate the working state of the superconducting magnet during normal operation. After completing the excitation training of the vertical test, it is necessary to perform a horizontal test to simulate the normal operation of the superconducting magnet and obtain relevant data on the magnetic field quality (such as the integrated magnetic field, magnetic field uniformity, etc.).

[0003] For solenoid-type, straight dipole / multipole superconducting magnets, horizontal testing can be performed directly through a thermostat direct temperature orifice tube. However, for arc-deflected superconducting magnets, a cryogenic Dewar suitable for horizontal testing has not yet been developed. The arc-deflected superconducting magnets on the rotating Gantry are cooled by conduction, while the arc-deflected superconducting magnets on the synchronous ring are cooled by liquid helium immersion. Due to the different cooling methods of these two magnets, two different specifications of cryogenic Dewars are usually required for horizontal testing. In addition, due to the different bending radius, deflection angle, and inner and outer diameters of the frame of the arc-deflected superconducting magnets, the same test equipment usually cannot meet the testing needs of arc-deflected superconducting magnets of different sizes. Summary of the invention

[0004] In view of this, the present disclosure provides a superconducting magnet horizontal test thermostat.

[0005] One aspect of the present disclosure provides a superconducting magnet horizontal test thermostat, which is applied to arc-shaped deflection superconducting magnets of various sizes and specifications, and includes: an outer dewar, which is used to provide a vacuum test environment for the arc-shaped deflection superconducting magnet and reduce the radiation heat leakage of the arc-shaped deflection superconducting magnet; a liquid helium service component, which is arranged above the outer dewar and is used to input liquid helium into the outer dewar in a liquid helium immersion cooling mode to cool the arc-shaped deflection superconducting magnet; a refrigerator, which is arranged above the outer dewar and is used to provide coldness to the inner part of the outer dewar in a conduction cooling mode, or to maintain the liquid helium temperature inside the outer dewar in the liquid helium immersion cooling mode; a warm hole elbow, which crosses the inner part of the outer dewar and passes through the arc-shaped deflection superconducting magnet, and is used to perform a horizontal test on the arc-shaped deflection superconducting magnet; and a support component, which is connected to the outer dewar and is used to adjust the posture of the outer dewar and the arc-shaped deflection superconducting magnet.

[0006] According to an embodiment of the present disclosure, the refrigerator includes: a primary cold head and a secondary cold head, which are used to provide cold air for the outer dewar; the primary cold head is used to cool the primary cold conduction plate, and the cold screen is cooled by conduction through the primary cold conduction plate; the secondary cold head is used to cool the secondary cold conduction plate; the primary cold conduction plate and the secondary cold conduction plate are arranged inside the outer dewar; the cold screen is arranged inside the outer dewar and connected to the primary cold conduction plate; the secondary cold conduction plate is arranged at a position closer to the arc deflection superconducting magnet than the primary cold conduction plate, and is connected to the arc deflection superconducting magnet through the copper braided belt, so as to cool the arc deflection superconducting magnet.

[0007] According to an embodiment of the present disclosure, in the liquid helium immersion cooling mode, it also includes: a magnet helium tank and a liquid helium infusion tube; the magnet helium tank is arranged in the outer Dewar, and is used to accommodate the liquid helium input by the liquid helium service component through the liquid helium infusion tube to immersion cool the arc deflection superconducting magnet.

[0008] According to an embodiment of the present disclosure, it also includes: an eccentric flange, which is arranged at one end of the outer Dewar and connected to the warm hole elbow, and is used to adjust the position of the warm hole elbow and seal the outer Dewar.

[0009] According to an embodiment of the present disclosure, the size, bending radius and deflection angle of the warm hole bend pipe match those of the arc-shaped deflection superconducting magnet.

[0010] According to an embodiment of the present disclosure, the support assembly includes: a magnet adjustable support base, which is arranged in the outer Dewar, used to support the arc-shaped deflection superconducting magnet and adjust the position of the arc-shaped deflection superconducting magnet so that the arc-shaped deflection superconducting magnet matches the axis of the warm hole bend pipe.

[0011] According to an embodiment of the present disclosure, the support assembly further includes: a high thermal insulation support structure, which is disposed below the outer dewar and connected to the magnet adjustable support base, and is used to reduce conduction heat leakage of the arc-shaped deflection superconducting magnet.

[0012] According to an embodiment of the present disclosure, the support assembly further includes: a three-dimensionally adjustable support base, connected below the high thermal insulation support structure, for supporting the outer dewar and adjusting the overall posture of the outer dewar.

[0013] According to an embodiment of the present disclosure, the primary cooling plate and the secondary cooling plate are made of copper material.

[0014] According to an embodiment of the present disclosure, the warm hole elbow is made of 316L stainless steel.

[0015] The disclosed embodiment provides a horizontal test thermostat for conduction and immersion cooling of arc-shaped deflection superconducting magnets of various specifications. The horizontal test thermostat can be adapted to superconducting magnets with two different cooling methods: conduction cooling and liquid helium immersion, and can perform horizontal tests on arc-shaped deflection superconducting magnets with different deflection radii and deflection angles. 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 The external structure diagram of the superconducting magnet horizontal test thermostat to which the present disclosure can be applied is schematically shown;

[0018] Figure 2 A schematic diagram of a half-section structure of a superconducting magnet horizontal test thermostat according to an embodiment of the present disclosure is schematically shown.

[0019] Description of reference numerals:

[0020] 1-external dewar, 2-refrigerator, 3-current lead, 4-superconducting magnet, 5-three-dimensional adjustable support base, 6-magnet adjustable support base, 7-warm hole elbow, 8-cold shield, 9-high insulation support structure, 10-eccentric flange, 11-liquid helium service component, 12-secondary cold plate, 13-primary cold plate. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, 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 also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0022] 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 existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0023] All terms (including technical and scientific terms) used herein 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.

[0024] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

[0025] like Figure 1 and Figure 2 As shown, a superconducting magnet horizontal test thermostat provided by the embodiment of the present disclosure can be applied to arc-shaped deflection superconducting magnets 4 of various sizes and specifications, including: an outer dewar 1, used to provide a vacuum test environment for the arc-shaped deflection superconducting magnet 4, and reduce the radiation heat leakage of the arc-shaped deflection superconducting magnet 4; a liquid helium service component 11, arranged above the outer dewar 1, used to input liquid helium into the outer dewar 1 in a liquid helium immersion cooling mode to cool the arc-shaped deflection superconducting magnet 4; a refrigerator 2, arranged above the outer dewar 1, used to provide coldness to the inner part of the outer dewar 1 in a conduction cooling mode, or to maintain the liquid helium temperature inside the outer dewar 1 in a liquid helium immersion cooling mode; a warm hole elbow 7, which crosses the inner part of the outer dewar 1 and passes through the arc-shaped deflection superconducting magnet 4, and is used to perform a horizontal test on the arc-shaped deflection superconducting magnet 4; a support component, connected to the outer dewar 1, used to adjust the posture of the outer dewar 1 and the arc-shaped deflection superconducting magnet 4.

[0026] In the disclosed embodiment, the refrigerator 2 is a GM refrigerator 2, including: a primary cold head and a secondary cold head, which are used to provide cold for the outer dewar 1. Among them, the primary cold head is used to cool the primary cold plate 13, and the cold shield 8 is cooled by conduction through the primary cold plate 13; the secondary cold head is used to cool the secondary cold plate 12; the primary cold plate 13 and the secondary cold plate 12 are arranged inside the outer dewar 1; the cold shield 8 is arranged inside the outer dewar 1, connected to the primary cold plate 13; the secondary cold plate 12 is arranged at a position closer to the arc deflection superconducting magnet 4 than the primary cold plate 13, and is connected to the arc deflection superconducting magnet 4 through a copper braided belt, and is used to cool the arc deflection superconducting magnet 4.

[0027] In the disclosed embodiment, in the liquid helium immersion cooling mode, the superconducting magnet 4 horizontal test thermostat includes, in addition to the liquid helium service component 11, a magnet helium tank and a liquid helium infusion tube. The magnet helium tank is arranged in the outer dewar 1, and is used to accommodate the liquid helium inputted by the liquid helium service component 11 through the liquid helium infusion tube, so as to immerse and cool the arc deflection superconducting magnet 4, and provide cold capacity for the arc superconducting magnet 4.

[0028] The superconducting magnet horizontal test thermostat also includes: an eccentric flange 10, which is arranged at one end of the outer dewar 1, connected to the warm hole bend 7, used to adjust the position of the warm hole bend 7, and seal the outer dewar 1. The size, bending radius and deflection angle of the warm hole bend 7 match the arc-shaped deflection superconducting magnet 4, and the arc-shaped deflection superconducting magnet 4 with different bending radii and different deflection angles can be matched by modifying the size of the bend, which can meet the testing requirements of the arc-shaped deflection superconducting magnet 4 with a bending radius of 800-2500mm and a deflection angle of 25-60°.

[0029] In the disclosed embodiment, the support assembly includes a magnet adjustable support base 6. The magnet adjustable support base 6 is arranged in the outer dewar 1, and is used to support the arc deflection superconducting magnet 4, and adjust the position of the arc deflection superconducting magnet 4 so that the arc deflection superconducting magnet 4 matches the axis of the warm hole bend 7. The support assembly also includes a high insulation support structure 9, which is arranged below the outer dewar 1 and connected to the magnet adjustable support base 6, and is used to reduce the heat leakage of the arc deflection superconducting magnet 4. The support assembly also includes: a three-dimensional adjustable support base 5, which is connected below the high insulation support structure 9, and is used to support the outer dewar 1 and adjust the overall posture of the outer dewar 1.

[0030] According to the superconducting magnet horizontal test thermostat provided by the embodiment of the present disclosure, the entire outer dewar 1 is supported and position-adjusted by a three-dimensionally adjustable support, the radiation cold shield 8 and the multi-layer insulation material reduce the low-temperature heat leakage of the superconducting magnet, the magnet is fixed on the adjustable magnet support base, and can be adjusted and positioned together with the adjustment base so that the central axis of the superconducting magnet 4 matches the axis of the warm hole elbow 7, and is supported by a high insulation support structure 9, the top includes a GM refrigerator 2 as a conduction cooling and liquid helium "zero" evaporation low-temperature cold source, and is equipped with a liquid helium service component 11 for liquid helium input, and the middle is equipped with an eccentric adjustable flange and an arc-shaped warm hole tube for isolating the vacuum and serving as a magnetic field quality test channel. When the superconducting magnet 4 is conduction-cooled, the secondary cold head of the GM refrigerator 2 cools the secondary cold plate, and the cold plate transfers the cold to the magnet through the copper braided belt to conduction-cool the magnet; when the superconducting magnet 4 is cooled by liquid helium immersion, the liquid helium is first input into the magnet helium tank through the liquid helium infusion tube through the top service component 11 (in the liquid helium immersion cooling method, the stainless steel structure of the liquid helium is sealed outside the magnet, and the conduction cooling method does not have this structure), and then the liquid helium infusion tube is pulled out, and the liquid helium is maintained at "zero" evaporation through the GM refrigerator 2. The primary cold head of the GM refrigerator 2 cools the primary cold plate 13, and conduction cools the entire cold shield 8 cylinder, which becomes a cold shield 8 better than 80K, reducing system heat leakage. During the cooling process of the horizontal test thermostat, the cold head and the cold plate can be connected by a soft copper braided belt to prevent the vibration components from affecting the superconducting magnet 4; the end eccentric flange 10 can perform radial sealing vacuum, and the position of the temperature hole bend 7 can be adjusted by adjusting the end bolts, and the bellows can match the adjustment angle; the arc-shaped bend size can be modified to match the arc-shaped deflection superconducting magnet 4 with different bending radii and different deflection angles, which can meet the testing requirements of the arc-shaped deflection superconducting magnet 4 with a bending radius of 800-2500mm and a deflection angle of 25-60°. At the same time, through the bottom plate height adjustment device, it can adapt to the testing requirements of the arc-shaped deflection superconducting magnet 4 with a skeleton diameter of 100-500mm; a horizontal test thermostat is compatible with the cooling requirements of conduction cooling and liquid helium immersion cooling magnets, which greatly saves costs and broadens usage requirements.

[0031] The cooling copper plate and copper braided belt are made of copper with high thermal conductivity at low temperature and high RRR, and the test elbow is made of 316L stainless steel with low magnetic permeability to reduce the influence of the magnetization effect of the excitation process on the magnetic field measurement results.

[0032] The three-dimensional adjustable support base, GM refrigerator 2, current lead 3 (used to provide power for refrigerator 2 and liquid helium service component 11), wall penetration, liquid helium service component 11, and eccentric flange 10 are placed on the outer dewar 1 of the thermostat, and the environment outside the outer dewar 1 is normal temperature and pressure; the cold plate, copper braided belt, magnet adjustable support base 6, superconducting magnet 4, and cold shield 8 are all placed in the outer dewar 1 of the thermostat, and the environment inside the outer dewar 1 is a vacuum environment. The GM refrigerator 2 conducts cooling or liquid helium immersion "zero" evaporation cooling on the superconducting magnet 4 through the copper braided belt connected to the cold head.

[0033] The superconducting magnet horizontal test thermostat provided by the embodiment of the present disclosure can avoid the influence of vibrating components on the superconducting magnet 4 during the cooling process; the eccentric flange 10 at its end can adjust the position of the warm hole bend 7 to match the magnet axis; the copper cold plate and copper braided belt with high thermal conductivity at low temperature with high RRR value improve the thermal conductivity efficiency and the temperature uniformity of the superconducting magnet 4; it can be used for horizontal testing of arc-deflected superconducting magnets 4 with different bending radii, different deflection angles, and different skeleton diameters; a single horizontal test thermostat meets the testing requirements of arc-deflected superconducting magnets 4 using two cooling methods: conduction cooling and liquid helium immersion cooling.

Claims

1. A superconducting magnet horizontal test thermostat, applied to arc-shaped deflection superconducting magnets (4) of various sizes, comprising: An external dewar (1) is used to provide a vacuum test environment for the arc-shaped deflection superconducting magnet (4), and a cold shield (8) is used to reduce radiation heat leakage of the arc-shaped deflection superconducting magnet (4); A liquid helium service component (11) is disposed above the outer dewar (1) and is used to input liquid helium into the inner part of the outer dewar (1) in a liquid helium immersion cooling mode to cool the arc deflection superconducting magnet (4); A refrigerator (2) is disposed above the outer dewar (1) and is used to provide cold air to the interior of the outer dewar (1) in a conduction cooling mode, or to maintain the temperature of the liquid helium inside the outer dewar (1) in a liquid helium immersion cooling mode; A warm hole bent pipe (7) is passed through the interior of the outer dewar (1) and through the arc-shaped deflection superconducting magnet (4) and is used to perform a horizontal test on the arc-shaped deflection superconducting magnet (4); A support assembly is connected to the outer dewar (1) and is used to adjust the posture of the outer dewar (1) and the arc-shaped deflection superconducting magnet (4).

2. The superconducting magnet horizontal test thermostat according to claim 1, wherein: The refrigerator (2) comprises: A primary cold head and a secondary cold head, used to provide cooling for the outer dewar (1); The first-level cold head is used to cool the first-level cold conduction plate (13), and the cold shield (8) is cooled by conduction through the first-level cold conduction plate (13); The secondary cold head is used to cool the secondary cold conduction plate (12); The primary cooling plate (13) and the secondary cooling plate (12) are arranged inside the outer dewar (1); The cold shield (8) is arranged inside the outer dewar (1) and connected to the first-stage cold conduction plate (13); The secondary cooling plate (12) is arranged at a position closer to the arc-shaped deflection superconducting magnet (4) than the primary cooling plate (13), is connected to the arc-shaped deflection superconducting magnet (4) via a copper braided belt, and is used to cool the arc-shaped deflection superconducting magnet (4).

3. The superconducting magnet horizontal test thermostat according to claim 1, wherein: In liquid helium immersion cooling mode, it also includes: Magnet helium tank and liquid helium infusion tube; The magnet helium tank is arranged in the outer dewar (1) and is used to accommodate the liquid helium input by the liquid helium service component (11) through the liquid helium infusion tube so as to immerse and cool the arc-shaped deflection superconducting magnet (4).

4. The superconducting magnet horizontal test thermostat according to claim 1, wherein: Also includes: An eccentric flange (10) is provided at one end of the outer dewar (1) and is connected to the warm hole elbow (7) and is used to adjust the position of the warm hole elbow (7) and to seal the outer dewar (1).

5. The superconducting magnet horizontal test thermostat according to claim 1, wherein: The size, bending radius and deflection angle of the warm hole bend tube (7) match those of the arc-shaped deflection superconducting magnet (4).

6. The superconducting magnet horizontal test thermostat according to claim 1, wherein: The support assembly comprises: The magnet adjustable support base (6) is arranged in the outer dewar (1) and is used to support the arc-shaped deflection superconducting magnet (4) and adjust the position of the arc-shaped deflection superconducting magnet (4) so ​​that the arc-shaped deflection superconducting magnet (4) matches the axis of the warm hole bend tube (7).

7. The superconducting magnet horizontal test thermostat according to claim 6, wherein: The support assembly also includes: A high thermal insulation support structure (9) is disposed below the outer dewar (1) and connected to the magnet adjustable support base (6) and is used to reduce conduction heat leakage of the arc-shaped deflection superconducting magnet (4).

8. The superconducting magnet horizontal test thermostat according to claim 7, wherein: The support assembly also includes: A three-dimensionally adjustable support base (5) is connected below the high thermal insulation support structure (9) and is used to support the outer dewar (1) and adjust the overall posture of the outer dewar (1).

9. The superconducting magnet horizontal test thermostat according to claim 2, wherein: The primary cooling plate (13) and the secondary cooling plate (12) are made of copper material.

10. The superconducting magnet horizontal test thermostat according to claim 1, wherein: The warm hole elbow (7) is made of 316L stainless steel.

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