CN117275868A - A two-pole deflection superconducting magnet structure for cyclotron beam line - Google Patents
A two-pole deflection superconducting magnet structure for cyclotron beam line Download PDFInfo
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- CN117275868A CN117275868A CN202311233488.8A CN202311233488A CN117275868A CN 117275868 A CN117275868 A CN 117275868A CN 202311233488 A CN202311233488 A CN 202311233488A CN 117275868 A CN117275868 A CN 117275868A
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- 238000009413 insulation Methods 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 238000012546 transfer Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- -1 but not limited to Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- 239000012774 insulation material Substances 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000011889 copper foil Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 17
- 238000001816 cooling Methods 0.000 abstract description 11
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000001307 helium Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- FFWQPZCNBYQCBT-UHFFFAOYSA-N barium;oxocopper Chemical compound [Ba].[Cu]=O FFWQPZCNBYQCBT-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002661 proton therapy Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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Abstract
The invention discloses a dipolar deflection superconducting magnet structure for beam lines of a cyclotron, which is arranged in a fan-shaped space formed by combining upper and lower pole heads of a beam line deflection magnet with a return yoke, and comprises a vacuum dewar at the outermost layer, a high-temperature superconducting coil and a coil framework, wherein the high-temperature superconducting coil is arranged in the vacuum dewar; the method is characterized in that: the vacuum Dewar and the external dimension of the superconducting magnet are smaller than the conventional dimension; the single-stage refrigerator is used for cooling the superconducting coil and the local heat insulation screen respectively through a heat insulation screen cold conduction belt and a coil cold conduction belt; compared with the prior art, the invention has smaller vacuum Dewar size, and can effectively reduce the weight of the normal-temperature iron core and the iron yoke and the weight of the whole machine when being applied to the dipolar magnet.
Description
Technical Field
The invention belongs to the technical field of proton therapy cyclotrons, and particularly relates to a dipolar deflection superconducting magnet structure for beam lines of a cyclotron.
Background
The two-pole deflection magnet is commonly used for deflection and correction of beam direction on the beam line of the cyclotron. Scientific research and industrial equipment such as energy spectrometers, separators, background field test magnets and the like are also often based on diode magnets. In the more common excitation modules, the superconducting coils have a great advantage obviously under the requirement of high magnetic field intensity. Meanwhile, the application of the superconducting coil can greatly reduce the power consumption and the running cost and the weight of the whole machine. The iron core dominant magnet formed by combining the superconducting magnet with the pole head and the iron yoke at normal temperature is called a two-pole deflection superconducting magnet system.
The superconducting magnet is a part of a diode deflection superconducting magnet system, and the superconducting magnet surrounds a sector space formed by combining upper and lower pole heads of the diode deflection magnet system and a yoke. The superconducting magnet works in a low-temperature environment, and the superconducting magnet adopting a small refrigerator can be divided into two modes of conduction cooling and liquid helium soaking cooling according to the cooling mode, wherein the left diagram of the figure 1 is the superconducting magnet of the conduction cooling mode, and the right diagram is the superconducting magnet of the liquid helium soaking cooling mode. The two forms adopt two-stage refrigerators, a cold screen is arranged between the coil and the vacuum Dewar, a plurality of layers of heat insulation materials are coated on the cold screen, and the first stage of the refrigerator provides cold energy for the cold screen so as to reduce radiation heat transfer of the vacuum Dewar 1 at the room temperature end to the superconducting coil. The coil or liquid helium is supplied with cold by the refrigerator secondary. Because the cold screen structure and the high-temperature superconducting coil structure are fixed by hanging structures such as a pull rod, the whole dipolar deflection magnet system has a complex structure and occupies a large space.
Disclosure of Invention
The invention provides a dipolar deflection superconducting magnet structure for beam lines of a cyclotron, which aims to solve the problems that the whole dipolar deflection magnet system is complex in structure and occupies a large space because a cold screen structure and a superconducting coil structure in the prior art are separately installed and fixed by hanging structures such as a pull rod and the like.
The invention adopts the following technical scheme for solving the technical problems:
the two-pole deflection superconducting magnet structure for beam lines of the cyclotron is arranged in a fan-shaped space formed by combining upper and lower pole heads of the beam line deflection magnet with an iron yoke, and comprises an outermost vacuum dewar, a high-temperature superconducting coil and a coil skeleton, wherein the high-temperature superconducting coil and the coil skeleton are arranged in the vacuum dewar; the method is characterized in that:
the vacuum Dewar external dimension of the superconducting magnet is smaller than the conventional dimension; the single-stage refrigerator is used for cooling the superconducting coil and the local heat insulation screen respectively through a heat insulation screen cold conduction belt and a coil cold conduction belt; the ratio of the lengths and the cross sections of the heat-insulating screen cold-conducting belt and the coil cold-conducting belt can meet the requirement that the temperature difference is formed between the heat-insulating screen and the coil, and the heat radiation of the heat-insulating screen can not be excessively transmitted to the superconducting coil.
Further, the temperature of the refrigerator is 20K, the temperature of the heat insulation screen is about 30K, and the temperature of the superconducting coil is an operating temperature point between 20K and 22K.
Further, the vacuum Dewar external dimension of the superconducting magnet is smaller than the conventional dimension, and specifically comprises the following steps: the size of the cross section of the vacuum Dewar is reduced from 140mm multiplied by 130mm to 90mm multiplied by 70mm; the height reduction of the upper pole head and the lower pole head matched with the vacuum Dewar is reduced from 170mm to 100mm; the width of the return yoke matched with the vacuum Dewar is reduced from 480mm to 430mm.
Further, the yoke and pole head portions that match the superconducting magnet are lighter in weight, which can be reduced to 1.5 tons compared to 2.0 tons for conventional designs. And the magnetic field performance of the conventional design is ensured to be unchanged.
Further, the ratio of the length and the cross-sectional area of the heat-insulating screen cold-conducting belt to the length and the cross-sectional area of the coil cold-conducting belt can meet the requirements of forming a radiation heat transfer temperature difference between the heat-insulating screen and the coil and not enabling heat radiation of the heat-insulating screen to be excessively transferred to the superconducting coil, and specifically comprises the following steps: the length ratio of the heat insulation screen cold conduction belt from the refrigerator to the heat insulation screen is 1.5-2 times of that of the coil cold conduction belt from the refrigerator to the superconducting coil framework; the ratio is a long section ratio.
Further, the local heat-insulating screen is fixed on the coil frame by a spacer, and the local heat-insulating screen is not in contact with the coil frame except for the spacer.
Further, the spacer between the local thermal insulation screen and the coil bobbin has a thickness of between 2-5 mm.
Further, the temperature of the refrigerator was 20K, the temperature of the heat insulating panel was about 30K, and the temperature of the coil was slightly higher than 20K.
Further, the local heat insulation screen adjacent to the coil is fixed around the coil by adopting a plurality of thin aluminum screens or copper screens, and a plurality of layers of heat insulation materials are coated outside the local heat insulation screen.
Further, the spacer is constructed of a low temperature resistant and low thermal conductivity material including, but not limited to, epoxy, polytetrafluoroethylene, ensuring minimal heat leakage to the high temperature superconducting coil.
Further, the thermal insulation shield cold guide strip and coil cold guide strip are made of high thermal conductivity materials including, but not limited to, high purity oxygen free copper braid, or multi-layer copper foil strips.
Advantageous effects of the invention
1. The structure can adopt a single-stage refrigerator to realize effective cooling of the high-temperature superconducting coil, so that the high-temperature superconducting coil has a low-temperature condition for normal operation. Compared with a superconducting magnet with a structure requiring a double-stage refrigerator and an independent cold screen, the superconducting magnet has the advantages of simple and compact structure and reduced process difficulty.
2. Compared with the prior art, the superconducting temperature iron structure has smaller vacuum Dewar size under the same superconducting coil size. When the magnetic iron core is applied to the dipolar magnet, the weight of the normal-temperature iron core and the iron yoke can be effectively reduced, and the weight of the whole machine is effectively reduced.
3. Compared with normal-temperature electromagnet, the superconducting warm iron structure can reduce power consumption and running cost to a greater extent. Especially for the application of higher magnetic field intensity, the cost of the coil, the power supply, the cooling and other equipment can be greatly reduced.
Drawings
FIG. 1 is a diagram showing the refrigerating effect of a superconducting magnet based on a two-stage refrigerator in the prior art
FIG. 2a is a schematic diagram of the effect of the present invention for producing a secondary refrigerator with a primary refrigerator;
FIG. 2b is a schematic view of a partial thermal shield spacer block adjacent a coil in accordance with the present invention;
FIG. 3 is a partial cross-sectional view of a structure of a two-pole deflection superconducting magnet of the present invention;
FIG. 4 is a partial outline view of a structure of a two-pole deflection superconducting magnet according to the present invention;
fig. 5 is a diagram showing the layout effect of deflection magnets on the beam line of the cyclotron.
In the figure, 1: vacuum Dewar; 2: a refrigerating machine; 3: a local thermal insulation screen; 4-1: a heat insulation screen cold guide belt; 4-2: a coil cold guide belt; 5-1: a high temperature superconducting coil; 5-2: a coil bobbin; 5-3: a spacer block; 6: a pole head; 7: and (5) a return yoke.
Detailed Description
Principle of design of the invention
1. The innovation point of the invention is as follows: the innovation point is that the effect of the secondary refrigerator is realized by the primary refrigerator, so that the sectional area of the superconducting magnet is reduced by nearly one half. The effect of the secondary refrigerator is achieved by the primary refrigerator, namely the radiation heat transfer temperature difference which can be formed by the secondary refrigerator is achieved by the primary refrigerator, and the radiation heat transfer temperature difference is the radiation heat transfer temperature difference from the normal-temperature vacuum Dewar to the local heat insulation screen and the radiation heat transfer temperature difference from the local heat insulation screen to the coil.
2. The invention overcomes the traditional bias that: the means for forming the temperature difference between the cold shield and the high temperature superconducting coil must be the temperature difference between the primary refrigerator and the secondary refrigerator, and the temperature difference between the two refrigerators is used to form the temperature difference between the cold shield and the high temperature superconducting coil. For example, the primary cold head cools the cold screen and the secondary cold head cools the high temperature superconducting coil, thereby creating a temperature difference between the cold screen and the high temperature superconducting coil. The invention is contrary to conventional thinking, and forms the temperature difference between the local heat insulation screen and the high-temperature superconducting coil by using the difference of the length-section ratio between the cold conduction belt and the cold conduction belt. Specifically, the difference of the length ratio of the cold conduction band of the local heat insulation screen to the length ratio of the cold conduction band of the coil is used for forming the temperature difference between the local heat insulation screen and the high-temperature superconducting coil. The length-section ratio is the length of the cold guide belt plus the sectional area of the cold guide belt to form a comparison unit. The difference in length-to-length ratio results in a relatively high temperature at the end of the cold guide belt remote from the refrigerator, where the length-to-length ratio is relatively large. The principle is that according to the fourier heat conduction relationship, the temperature gradient of heat conduction is proportional to the length of the heat conduction path (i.e. the cold conduction band) and inversely proportional to the sectional area of the heat conduction path. The temperature of the end of the cold conduction band connected with the local heat insulation screen is higher than that of the end connected with the high-temperature superconducting coil, provided that the length of the cold conduction band connected with the local heat insulation screen is larger than that of the cold conduction band connected with the high-temperature superconducting coil. Thereby ensuring that the temperature of the local thermal insulation screen is greater than the temperature of the high temperature superconducting coil.
3. The invention finds a balance point between simplifying the structure and ensuring the working temperature of the coil. The superconducting magnet simplifies the structure and requires to remove the cold screen, because the cold screen structure and the high-temperature superconducting coil structure are fixed by hanging structures such as a pull rod, the whole diode deflection magnet system has a complex structure and occupies a large space. However, the cold screen is removed, so that the size of the cross section of the vacuum dewar can be reduced from 140mm multiplied by 130mm to 90mm multiplied by 70mm, but the temperature of the coil is ensured, and the working temperature range of the high-temperature superconducting coil is 4K to 70K. In contrast, the invention adds the local heat insulation layer adjacent to the coil between the high-temperature superconducting coil and the vacuum Dewar, and the temperature of the local heat insulation layer is controlled by the length-section ratio of the cold conduction belt, so that the temperature of the local heat insulation layer is set to be 30K, and thus, the heat radiation conducted from 30K to 20K can ensure the temperature of the superconducting coil to be the working temperature point between 20K and 22K through the isolation of 30K in the middle.
In summary, the present invention finds a balance point between simplifying the structure and ensuring the coil operating temperature: the temperature of the high temperature superconducting coil is aimed at meeting the excitation requirements or at being sufficient, neither too low nor too high, but slightly higher than 20K. The slightly higher temperature is that the temperature of the guide coil is between 20K and 22K; the inner space of the vacuum dewar is not smaller and better, but a local heat insulation layer is added near the coil. Since the local insulation is very close to the coil, the local insulation is only one tenth of the cold screen to coil distance, enabling the vacuum Du Waneng to be scaled down from the dimensions 140mm x 130mm of the cross section to 90mm x 70mm.
Based on the principle, the invention designs a two-pole deflection superconducting magnet structure for beam lines of a cyclotron, which is arranged in a fan-shaped space formed by combining upper and lower pole heads of the beam line deflection magnet and a return yoke and comprises an outermost vacuum dewar 1, a superconducting coil 5-1 and a coil skeleton 5-2, wherein the superconducting coil is arranged in the vacuum dewar 1, and the superconducting magnet structure is shown in figures 1, 2a, 2b, 3, 4 and 5; the method is characterized in that:
the vacuum Dewar 1 and the external dimension of the superconducting magnet are smaller than the conventional dimension; the two-pole deflection superconducting magnet structure adopts a single-stage refrigerator 2, and a local heat insulation screen 3 which is manufactured integrally with the coil and is close to the coil replaces a conventional cold screen which is hung independently and needs to be refrigerated by the independent refrigerator, and the single-stage refrigerator cools the superconducting coil 5-1 and the local heat insulation screen 3 through a heat insulation screen cold conduction belt 4-1 and a coil cold conduction belt 4-2 respectively; the ratio of the length and the cross-sectional area of the heat-insulating screen cold-conducting belt 4-1 and the coil cold-conducting belt 4-2 can meet the requirement of forming a temperature difference between the heat-insulating screen and the coil, and can meet the requirement of not causing excessive heat radiation of the heat-insulating screen to be transmitted to the superconducting coil.
Further, the temperature of the refrigerator 2 is 20K, the temperature of the local heat insulation screen is about 30K, and the temperature of the superconducting coil 5-1 is an operating temperature point between 20K and 22K.
Supplementary notes 1:
in this embodiment, a multi-layer adiabatic heat leakage formula is used to calculate the radiant heat transfer rate, and a fourier heat conduction formula is used to calculate the heat transfer rate, so as to calculate what the corresponding temperature should be at a certain radiant heat transfer rate. The above formulas are all of a matter of common general knowledge within the profession and are not presented.
Further, the overall dimension of the vacuum dewar 1 of the superconducting magnet is smaller than the conventional dimension, specifically: the size of the cross section of the vacuum Dewar 1 is reduced from 140mm multiplied by 130mm to 90mm multiplied by 70mm; the height reduction of the upper pole head and the lower pole head matched with the vacuum Dewar 1 is reduced from 170mm to 100mm; the width of the return yoke matched with the vacuum Dewar is reduced from 480mm to 430mm.
Further, the parts of the return yoke 7 and the pole head 6 matched with the superconducting magnet are lighter in weight, the parts can be reduced to 1.5 tons compared with 2.0 tons of the conventional design, and the magnetic field performance of the conventional design is ensured to be unchanged.
Further, the ratio of the lengths and the cross-sectional areas of the heat-insulating screen cold-conducting belt 4-1 and the coil cold-conducting belt 4-2 can meet the requirement that the radiation heat transfer temperature difference is formed between the heat-insulating screen and the coil, and the heat radiation of the heat-insulating screen can not be excessively transferred to the high-temperature superconducting coil, specifically: the length ratio of the heat insulation screen cold conduction band 4-1 from the refrigerator 2 to the heat insulation screen is 1.5-2 times of that of the coil cold conduction band 4-2 from the refrigerator 2 to the superconducting coil skeleton 5-2; the ratio is a long section ratio.
Further, the partial heat-insulating screen 3 is fixed to the coil bobbin 5-2 by a spacer 5-3, and the partial heat-insulating screen 3 is not in contact with the coil bobbin 5-2 except for the spacer 5-3.
Further, the spacer between the local thermal insulation screen and the coil bobbin has a thickness of between 2-5 mm.
Further, the local heat insulation screen 3 adjacent to the coil is fixed around the coil by a plurality of thin aluminum screens or copper screens, and is externally coated with a plurality of layers of heat insulation materials.
Further, the spacer block 5-3 is constructed of a low temperature resistant and low thermal conductivity material including, but not limited to, epoxy, polytetrafluoroethylene, ensuring minimal heat leakage to the high temperature superconducting coil.
Further, the heat insulation screen cold guide tape 4-1 and the coil cold guide tape 4-2 are made of high heat conductivity materials including, but not limited to, high purity oxygen free copper braid, or multi-layered copper foil tape.
Example 1
The invention provides a conduction cooling superconducting warm iron structure, wherein a superconducting magnet adopts a 20K single-stage refrigerator 2, a cold screen which is commonly used in the prior art and is hung singly is removed, a local heat insulation screen 3 adjacent to a coil is adopted to replace the cold screen, and the difference is that the local heat insulation screen 3 does not adopt the refrigerator to provide cold energy, but provides cold energy through a cold conduction belt 4-1. The coil 5-1 is directly cooled by the refrigerator single stage 2. The high-temperature superconducting coil 5-1 adopts a high-temperature superconducting material, can work in a temperature range of 20K-70K, and has a larger temperature margin. The structure of the superconducting magnet is schematically shown below.
In fig. 2a, 1 is a vacuum dewar where a high temperature superconducting coil is located, and is made of a non-magnetic material with a certain structural strength, such as 316L stainless steel, as a vacuum boundary of a superconducting magnet. The normal temperature pole head 6 and the normal temperature return yoke 7 are made of soft magnetic materials such as electric pure iron, and a required magnetic field is formed between working air gaps. The sizes of the normal-temperature pole head 6 and the return yoke 7 are influenced by the external size of the vacuum Dewar 1, and the weight of the whole machine can be greatly influenced. The high-temperature superconducting coil 5-1 is formed by winding a flat strip material typically made of barium copper oxide such as ReBCO or the like, or a combined superconducting cable. The 20K single-stage GM refrigerator 2 provides cooling capacity for the high-temperature superconducting coil 5-1.
The superconducting magnet in the vacuum dewar is schematically shown in fig. 2a and 2b, the high-temperature superconducting coil 5-1 is wound on the coil skeleton 5-2, and the coil skeleton 5-2 is generally made of high-purity oxygen-free copper, brass or aluminum alloy and other materials meeting high heat conductivity, is nonmagnetic and has certain structural strength requirements, is in a low-temperature environment with the high-temperature superconducting coil, and ensures the structural strength under electromagnetic force. The local heat insulation screen 3 which is adjacent to the coil and is used for not independently providing cold energy is formed by fixing a plurality of thin aluminum screens or copper screens around the coil, and a plurality of layers of heat insulation materials are coated outside the local heat insulation screen, so that the radiation heat transfer of a room temperature end to a low temperature end is greatly reduced, and the low temperature environment of the superconducting coil is ensured. The local heat-insulating screen 3 adjacent to the coil is fixed on the coil bobbin 5-2 by the spacer 5-3, and the local heat-insulating screen 3 is not in contact with the coil bobbin 5-2 except for the spacer 5-3. The spacer 5-3 is made of a material which is typically resistant to low temperatures, such as epoxy, polytetrafluoroethylene, etc., and has a low thermal conductivity, ensuring minimal leakage of heat to the superconducting coil 5-1. The superconducting coil 5-1 and the local heat insulation screen 3 are cooled by a single-stage refrigerator 2 through a heat insulation screen cold conduction band 4-1 and a coil cold conduction band 4-2. The heat-insulating shield cold-conducting tape 4-1 and the coil cold-conducting tape 4-2 are generally made of materials having high heat conductivity, such as high-purity oxygen-free copper braid, multi-layer copper foil tape, and the like. A partial schematic of the superconducting coil 5-1, the partial heat insulation screen 3, and the spacer 5-3 is shown in fig. 2 b.
It should be emphasized that the above-described embodiments are merely illustrative of the invention, which is not limited thereto, and that modifications may be made by those skilled in the art, as desired, without creative contribution to the above-described embodiments, while remaining within the scope of the patent laws.
Claims (10)
1. The two-pole deflection superconducting magnet structure for the beam line of the cyclotron is arranged in a fan-shaped space formed by combining upper and lower pole heads of the beam line deflection magnet and a return yoke, and comprises an outermost vacuum Dewar (1), a superconducting coil (5-1) and a coil skeleton (5-2) which are arranged in the vacuum Dewar (1); the method is characterized in that:
the vacuum Dewar (1) of the superconducting magnet has smaller external dimension than the conventional dimension; the two-pole deflection superconducting magnet structure adopts a single-stage refrigerator (2) and a local heat insulation screen (3) which is manufactured integrally with the coil and is close to the coil to replace a conventional cold screen which is hung independently and needs to be refrigerated by the independent refrigerator, and the single-stage refrigerator cools the superconducting coil (5-1) and the local heat insulation screen (3) through a heat insulation screen cold conduction belt (4-1) and a coil cold conduction belt (4-2) respectively; the ratio of the length and the cross section area of the heat-insulating screen cold-conducting belt (4-1) and the coil cold-conducting belt (4-2) can meet the requirement that the temperature difference is formed between the heat-insulating screen and the coil, and the heat radiation of the heat-insulating screen can not be excessively transmitted to the high-temperature superconducting coil.
2. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the temperature of the refrigerator (2) is 20K, the temperature of the local heat insulation screen is about 30K, and the temperature of the high-temperature superconducting coil (5-1) is an operating temperature point between 20K and 22K.
3. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the vacuum Dewar (1) of the superconducting magnet has smaller outline dimension than the conventional dimension, and is specifically as follows: the cross section of the vacuum Dewar (1) is reduced from 140mm multiplied by 130mm to 90mm multiplied by 70mm; the height reduction of the upper pole head and the lower pole head matched with the vacuum Dewar (1) is reduced from 170mm to 100mm; the width of the return yoke matched with the vacuum Dewar is reduced from 480mm to 430mm.
4. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the weight of the parts of the return yoke (7) and the pole head (6) matched with the superconducting magnet is lighter, the parts can be reduced to 1.5 tons compared with 2.0 tons of the conventional design, and the magnetic field performance of the conventional design is ensured to be unchanged.
5. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the ratio of the length and the cross section area of the heat insulation screen cold conduction belt (4-1) to the coil cold conduction belt (4-2) can meet the requirements of forming a radiation heat transfer temperature difference between the heat insulation screen and the coil and not enabling heat radiation of the heat insulation screen to be excessively transferred to the superconducting coil, and is specifically as follows: the length-to-length ratio of the heat insulation screen cold conduction belt (4-1) from the refrigerator (2) to the heat insulation screen is 1.5-2 times of that of the coil cold conduction belt (4-2) from the refrigerator (2) to the superconducting coil skeleton (5-2); the ratio is a long section ratio.
6. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the local heat insulation screen (3) is fixed on the coil skeleton (5-2) by a spacing block (5-3), and the local heat insulation screen (3) is not contacted with the coil skeleton (5-2) except the spacing block (5-3).
7. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 6, wherein: the thickness of the spacing block between the local heat insulation screen and the coil framework is 2-5 mm.
8. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the local heat insulation screen (3) adjacent to the coil is fixed around the coil by adopting a plurality of thin aluminum screens or copper screens, and a plurality of layers of heat insulation materials are coated outside the local heat insulation screen.
9. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 5, wherein: the spacer (5-3) is constructed of a low temperature resistant and low thermal conductivity material including, but not limited to, epoxy, polytetrafluoroethylene, ensuring minimal heat leakage to the high temperature superconducting coil.
10. A two-pole deflection superconducting magnet structure for cyclotron beam lines according to claim 1, wherein: the heat insulation screen cold conduction band (4-1) and the coil cold conduction band (4-2) are made of high heat conductivity materials including, but not limited to, high purity oxygen-free copper braid, or multi-layer copper foil band.
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| CN202311233488.8A CN117275868B (en) | 2023-09-21 | 2023-09-21 | A two-pole deflection superconducting magnet structure for cyclotron beam line |
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| US20100089073A1 (en) * | 2008-10-14 | 2010-04-15 | General Electric Company | High temperature superconducting magnet |
| GB201004558D0 (en) * | 2009-03-31 | 2010-05-05 | Gen Electric | Apparatus and method for cooling a superconducting magnetic assembly |
| CN202871443U (en) * | 2012-09-27 | 2013-04-10 | 华中科技大学 | Cold-conducting device for high temperature superconducting magnet |
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| GB201004558D0 (en) * | 2009-03-31 | 2010-05-05 | Gen Electric | Apparatus and method for cooling a superconducting magnetic assembly |
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