CN114724795B - Curved inclined solenoid superconducting magnet - Google Patents
Curved inclined solenoid superconducting magnet Download PDFInfo
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- CN114724795B CN114724795B CN202210403423.2A CN202210403423A CN114724795B CN 114724795 B CN114724795 B CN 114724795B CN 202210403423 A CN202210403423 A CN 202210403423A CN 114724795 B CN114724795 B CN 114724795B
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- 229910052734 helium Inorganic materials 0.000 claims abstract description 6
- 239000001307 helium Substances 0.000 claims abstract description 6
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 24
- 238000005452 bending Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 238000005516 engineering process Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 238000002560 therapeutic procedure Methods 0.000 description 4
- 206010028980 Neoplasm Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002661 proton therapy Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010884 ion-beam technique Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000001959 radiotherapy Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 101000642630 Homo sapiens Sine oculis-binding protein homolog Proteins 0.000 description 1
- 102100036670 Sine oculis-binding protein homolog Human genes 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 238000002665 ion therapy Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/006—Supplying energising or de-energising current; Flux pumps
-
- 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
-
- 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
- H01F6/065—Feed-through bushings, terminals and joints
Abstract
The invention relates to a curved oblique solenoid superconducting magnet, which comprises 1 diode magnet and 2 quadrupole magnets, wherein the diode magnet is positioned inside, the 2 quadrupole magnets are nested outside the diode magnet and distributed at two ends of the diode magnet, 3 superconducting magnets are arranged in a common liquid helium container, 3 power supplies are used for excitation control independently, a cold screen and a vacuum container are added to form the superconducting magnet, and a temperature hole of the superconducting magnet is curved in an arc shape. The wires of the superconducting magnet coil are clamped in the wire grooves on the framework, the wires are wound in a parallel stacking mode, and then the coil is connected in series according to single-turn wires by a superconducting joint to form a current loop of the single-turn wires. The bent oblique solenoid superconducting magnet can effectively reduce the mass and the volume of the proton ray treatment device and improve the proton treatment efficiency.
Description
Technical Field
The invention belongs to the field of superconducting electrics, and particularly relates to a bent inclined solenoid superconducting magnet which is used for a laser proton radiotherapy system.
Background
As the most ideal radiation for radiotherapy in the 21 st century, the use of ion beams in the field of tumor therapy has become increasingly popular. The proton and heavy ion are charged particles, different from the conventional rays such as X-ray, gamma ray, electron beam, etc., the proton and heavy ion with certain energy have Bragg Peak (Bragg Peak) which concentrates the deposited energy after being incident into human tissue, and the energy can be concentrated on tumors at different depths and different positions by adopting Bragg Peak broadening technology (Spread Out Bragg Peak, SOBP), and meanwhile, the damage to the normal tissue is reduced to the greatest extent. Because of advanced technology and complex equipment, only a few countries around the world currently master the technology. Ion beam therapy has been largely studied in the united states, japan and european parts of the country for the last decades, and is currently being industrially popularized to medical instruments by scientific research techniques. Although proton radiation technology has found great utility in tumor therapy, there are a number of technical drawbacks that currently need to be overcome. For example, the treatment terminal has complex technology and huge equipment, especially a rotating frame for supporting multi-azimuth irradiation of beam current, the weight of the rotating frame reaches hundred tons, the huge weight is required to be controlled by high-precision rotation, and the difficulty of mechanical structural design is greatly increased. Meanwhile, one research direction in the future is to integrate proton therapy and heavy ion therapy in the same system, so as to achieve the purpose of reducing the cost of compound therapy. Therefore, downsizing and weight saving of the apparatus are the development direction of the next-generation radiotherapy apparatus. Scientists have actively explored the technology miniaturization technology of treatment terminals from different directions in recent years. Among these, the use of superconducting magnet technology is a necessary option. Compared with the conventional magnet, the superconducting magnet adopts a pure coil structure, and a huge iron core is abandoned, so that the size and weight of the system are greatly reduced, furthermore, under the liquid helium temperature zone, the superconducting magnet can generate a higher magnetic field, the particle deflection radius is reduced, and the size of the rack is effectively reduced. In addition, by adopting a combined function magnet design, the two-pole magnet and the four-pole magnet are integrally designed, and the number of the magnets is reduced, so that the magnet system is more compact.
Chinese patent No. CN111477424a discloses a multidimensional vector magnet structure, which includes a diode magnetic field coil and a conventional magnet coil, the diode magnet coil is wound by a diagonal solenoid, and the conventional magnet coil is wound by a solenoid; chinese patent No. CN110181232a discloses a method for processing a bent oblique solenoid coil skeleton, and the oblique solenoid coil is a two-pole coil, and no quadrupole oblique solenoid coil is disclosed; chinese patent CN111048227a discloses an ECR ion source superconducting magnet structure comprising a canted solenoid coil and a solenoid coil, the canted solenoid coil being a hexapole magnet coil, a non-curved structure; chinese patent CN111790063 discloses a superconducting rotating gantry for a laser-accelerated proton therapy device, in which a mixed-field superconducting deflection magnet is involved, but no specific design structure is disclosed; US patent 6921042B1 discloses a canted coil superconducting magnet which is wound by a superconducting cable, is not wound by a multi-turn superconducting wire in parallel, and only comprises a diode magnet, and is not of a complete structure; international patent WO2017/087541A1 discloses a curved oblique solenoid magnet without active shielding of iron core, mainly relating to a dipolar oblique solenoid magnet and also referring to a double-helix quadrupole magnet, but the structural composition, arrangement form, winding method and magnetic field error compensation mechanism of the magnet are greatly different from the invention; US2017/0372867A1 discloses a diode magnet and a quadrupole magnet of a bending structure for proton treatment, wherein the quadrupole magnet is arranged inside and is of a long inclined solenoid structure, the diode magnet is nested outside the quadrupole magnet and is of a short inclined solenoid structure, the diode magnet is positioned in the middle of the diode magnet, the number and arrangement form of the magnets are different from those of the invention, and the large winding method and the magnetic field error compensation mechanism are also different from those of the invention.
Disclosure of Invention
In order to effectively reduce the weight and the volume of a proton ray treatment device, the invention provides a bent oblique solenoid superconducting magnet, which adopts a compact type two-pole magnet and four-pole magnet structural design, and discloses corresponding magnet structural characteristics, and adopts a corresponding magnetic field error correction method and a corresponding magnet coil winding method.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the superconducting coils of the superconducting magnet are in a curved circular arc shape, and comprise 1 long diode magnet and 2 short quadrupole magnets, wherein the 1 diode magnet is wound by adopting a diagonal solenoid winding method, the 2 quadrupole magnets are respectively nested at two ends of the second-stage magnet inside, the front end of one quadrupole magnet is flush with the front end of the diode magnet, the rear end of the other quadrupole magnet is flush with the rear end of the diode magnet, the 1 second-stage magnet and the 2 quadrupole magnets are arranged in a common liquid helium container, and a cold screen and a vacuum container are added to form the superconducting magnet; the temperature holes of the superconducting magnet are curved arc-shaped, and the superconducting magnet carries out excitation control on 1 secondary magnet and 2 quadrupole magnets by 3 independent power supplies.
Each magnet of the 1 dipolar magnet and the 2 quadrupolar magnets is formed by nesting 2 inclined solenoid coils, all the inclined solenoid coils are supported by 4 skeletons from inside to outside, wherein the 2 inclined solenoid coils of the dipolar magnet are supported by 2 independent skeletons, the inner inclined solenoid coils of the 2 quadrupolar magnets are supported by 1 skeleton in common, and the outer inclined solenoid coils of the 2 quadrupolar magnets are supported by 1 skeleton in common.
The superconducting coil and the skeleton of the superconducting magnet are provided with the same bending central shaft, the central shaft of the warm hole is not coaxial with the central shafts of the superconducting coil and the skeleton, and the bending radius of the central shaft of the warm hole is slightly smaller than that of the central shaft of the superconducting coil and the skeleton, so that the central shaft deviation of the magnetic field caused by the bending of the magnet is corrected.
The winding position of the oblique solenoid coil of the diode magnet is expressed by the following formula:
the winding position of the oblique solenoid coil of the quadrupole magnet is expressed by the following formula:
wherein:
in the above, θ is the circumferential angle, h is the turn pitch,r is the radius of the coil, and alpha is the inclination angle of the coil;
the whole bent oblique solenoid superconducting magnet is horizontally placed along the plane where the bending direction is located, the diode magnet generates a uniform magnetic field in the vertical direction, and the quadrupole magnet generates a uniform linear gradient magnetic field in the radial direction along the central axis of the magnet.
The coil winding method is characterized in that the coil winding is carried out by adopting a multi-turn parallel winding method, the coil framework is subjected to grooving of a wire groove in advance according to the position of the wire, the wire is clamped in the wire groove on the coil framework, the number of parallel turns of the wire along the central axis direction of the magnet is not less than 2, the number of stacked layers along the radial direction of the magnet is not less than 2, the coils are connected in series according to single-turn wires by adopting a superconducting joint after the winding of the 2 diagonal solenoid coils of the dipolar magnet is completed to form a current loop of the single-turn wire, and the coils are connected in series according to the single-turn wires by adopting the superconducting joint after the winding of the 2 diagonal solenoid coils of each magnet in the quadrupolar magnet is completed to form the current loop of the single-turn wire.
The beneficial effects are that:
the bent oblique solenoid superconducting magnet provided by the invention has the advantages that 1 diode magnet and 2 quadrupole magnets are placed in one set of superconducting magnet, the structure is compact, and the magnet scale can be effectively reduced; the magnetic field potential deviation caused by the bending of the magnet is compensated by adopting a mechanical correction method of the bending radius of the central shaft, so that the operability is strong; the winding method of multi-turn wire parallel does not increase the manufacturing cost of the wires, the wires are compacter in arrangement, the current density is higher, and the coil volume of the superconducting magnet is further reduced to a certain extent.
Drawings
FIG. 1 is a diagram showing the overall structure of a bent helical tube superconducting magnet coil of the present invention;
fig. 2 is a diagram showing a structure of a diode magnet coil of the bent helical tube superconducting magnet of the present invention;
fig. 3 is a four-pole magnet coil structure of the bent helical tube superconducting magnet of the present invention;
FIG. 4 is a schematic cross-sectional view of a curved helical superconducting magnet of the present invention;
fig. 5 is a schematic diagram of a wire wound structure of a helical superconducting magnet of the present invention.
Reference numerals illustrate: 1 is a dipolar magnet inner layer coil, 2 is a dipolar magnet outer layer coil, 3 is a magnet front end quadrupole magnet inner layer coil, 4 is a magnet front end quadrupole magnet outer layer coil, 5 is a magnet rear end quadrupole magnet inner layer coil, 6 is a magnet rear end quadrupole magnet outer layer coil, 7 is a dipolar magnet inner layer coil skeleton, 8 is a dipolar magnet outer layer coil skeleton, 9 is an inner layer coil skeleton shared by quadrupole magnets, 10 is an outer layer coil skeleton shared by quadrupole magnets, 11 is a superconducting magnet coil end plate, 12 is a liquid helium container, 13 is a cold screen, and 14 is a vacuum container.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without the inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
As shown in fig. 1, the bent oblique solenoid superconducting magnet is in a bent circular arc shape, the inside of the bent oblique solenoid superconducting magnet is a long dipolar magnet, the bent oblique solenoid superconducting magnet consists of a dipolar magnet inner coil 1 and a dipolar magnet outer coil 2, the outside of the bent oblique solenoid superconducting magnet is two short quadrupoles which are respectively nested at two ends of the secondary magnet, the front end of one quadrupoles is level with the front end of the dipolar magnet, the bent oblique solenoid superconducting magnet consists of a magnet front end quadrupoles magnet inner coil 3 and a magnet front end quadrupoles magnet outer coil 4, the rear end of the other quadrupoles magnet is level with the rear end of the dipolar magnet, and the bent oblique solenoid superconducting magnet consists of a magnet rear end quadrupoles magnet inner coil 5 and a magnet rear end quadrupoles magnet outer coil 6. To more clearly show the diode magnets, which are shown separately in fig. 2, and the quadrupole magnets, which are shown separately in fig. 3. All coils are helical solenoid coils.
Fig. 4 is a schematic cross-sectional view of a curved oblique solenoid superconducting magnet according to the present invention, where the inner-layer coil 1 of the diode magnet, the outer-layer coil 2 of the diode magnet, the inner-layer coil 3 of the front-end quadrupole magnet, the outer-layer coil 4 of the front-end quadrupole magnet, the inner-layer coil 5 of the rear-end quadrupole magnet, and the outer-layer coil 6 of the rear-end quadrupole magnet are placed in a common liquid helium container 12, and a cold screen 13 and a vacuum container 14 are added to form the superconducting magnet. The temperature hole of the superconducting magnet is in a curved arc shape. The one long dipolar magnet and the two short quadrupolar magnets are subjected to excitation control by three independent power supplies. The coils are supported by 4 frameworks from inside to outside, wherein the dipolar magnet inner layer coil 1 is supported by the dipolar magnet inner layer coil framework 7, the dipolar magnet outer layer coil 2 is supported by the dipolar magnet outer layer coil framework 8, the magnet front-end quadrupole magnet inner layer coil 3 and the magnet rear-end quadrupole magnet inner layer coil 5 of the quadrupole magnet are supported by an inner layer coil framework 9 shared by the common quadrupole magnet, and the magnet front-end quadrupole magnet outer layer coil 4 and the magnet rear-end quadrupole magnet outer layer coil 6 are supported by an outer layer coil framework 10 shared by the common quadrupole magnet.
The two-pole magnet inner layer coil 1, the two-pole magnet outer layer coil 2, the magnet front-end four-pole magnet inner layer coil 3, the magnet front-end four-pole magnet outer layer coil 4, the magnet rear-end four-pole magnet inner layer coil 5, the magnet rear-end four-pole magnet outer layer coil 6, the two-pole magnet inner layer coil former 7, the two-pole magnet outer layer coil former 8, the four-pole magnet shared inner layer coil former 9 and the four-pole magnet shared outer layer coil former 10 have the same bending central axis, the central axis of the temperature hole is not coaxial with the central axes of the coils and the frameworks, and the central axis bending radius of the temperature hole is slightly smaller than the central axis bending radius of the two-pole magnet inner layer coil 1, the two-pole magnet outer layer coil 2, the magnet front-end four-pole magnet inner layer coil 3, the magnet front-end four-pole magnet outer layer coil 4, the magnet rear-end four-pole magnet outer layer coil 6, the two-pole magnet inner layer coil former 7, the two-pole magnet outer layer coil former 8, the four-pole magnet shared inner layer coil former 9 and the four-pole magnet shared outer layer coil former 10, and the magnetic field bending radius of the central axes of the magnetic field offset caused by bending.
The winding positions of the oblique solenoid coils of the diode magnet inner layer coil 1 and the diode magnet outer layer coil 2 are expressed by the following formulas:
the winding positions of the oblique solenoid coils of the magnet front-end quadrupole magnet inner layer coil 3, the magnet front-end quadrupole magnet outer layer coil 4, the magnet rear-end quadrupole magnet inner layer coil 5 and the magnet rear-end quadrupole magnet outer layer coil 6 are represented by the following formulas:
wherein:
in the above, θ is the circumferential angle, h is the turn pitch,the phase angle, R is the coil radius, and α is the coil tilt angle.
The whole bent oblique solenoid superconducting magnet is horizontally placed along the plane where the bending direction is located, the diode magnet generates a uniform magnetic field in the vertical direction, and the quadrupole magnet generates a uniform linear gradient magnetic field in the radial direction along the central axis of the magnet.
As shown in fig. 5, the coil winding is performed by adopting a multi-turn parallel winding method, the coil framework is subjected to grooving of a wire groove in advance according to the position of the wire, the wire is clamped in the wire groove on the coil framework, the number of parallel turns of the wire along the central axis direction of the magnet is not less than 2, the number of stacked layers along the radial direction of the magnet is not less than 2, the 2 diagonal coils of the dipolar magnet are connected in series according to single-turn wires by adopting a superconducting joint after the winding is completed to form a current loop of the single-turn wire, and the 2 diagonal coils of each magnet in the quadrupolar magnet are connected in series according to the single-turn wires by adopting the superconducting joint after the winding is completed.
While the foregoing has been described in relation to illustrative embodiments thereof, so as to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as limited to the spirit and scope of the invention as defined and defined by the appended claims, as long as various changes are apparent to those skilled in the art, all within the scope of which the invention is defined by the appended claims.
Claims (2)
1. A curved helical superconducting magnet, characterized by: the superconducting coils of the superconducting magnet are in a curved arc shape, and comprise 1 long diode magnet and 2 short quadrupole magnets, the superconducting coils are wound by adopting a diagonal solenoid winding method, the 1 diode magnet is arranged inside, the 2 quadrupole magnets are respectively nested at two ends of the diode magnet, the front end of one quadrupole magnet is level with the front end of the diode magnet, the rear end of the other quadrupole magnet is level with the rear end of the diode magnet, and the 1 diode magnet and the 2 quadrupole magnets are arranged in a common liquid helium container, and a cold screen and a vacuum container are added to form the superconducting magnet; the temperature holes of the superconducting magnet are curved arc-shaped, and the superconducting magnet carries out excitation control on 1 secondary magnet and 2 quadrupole magnets by 3 independent power supplies;
each of the 1 dipolar magnet and the 2 quadrupolar magnets is formed by nesting 2 oblique solenoid coils, all the oblique solenoid coils are supported by 4 skeletons from inside to outside, wherein the 2 oblique solenoid coils of the dipolar magnet are supported by 2 independent skeletons, the inner oblique solenoid coils of the 2 quadrupolar magnets are supported by 1 skeleton in common, and the outer oblique solenoid coils of the 2 quadrupolar magnets are supported by 1 skeleton in common;
the coil winding method is characterized in that the coil winding is carried out by adopting a multi-turn parallel winding method, the coil framework is subjected to grooving of a wire groove in advance according to the position of the wire, the wire is clamped in the wire groove on the coil framework, the number of parallel turns of the wire along the central axis direction of the magnet is not less than 2, the number of stacked layers along the radial direction of the magnet is not less than 2, the coils are connected in series according to single-turn wires by adopting a superconducting joint after the winding of the 2 diagonal solenoid coils of the dipolar magnet is completed to form a current loop of the single-turn wire, and the coils are connected in series according to the single-turn wires by adopting the superconducting joint after the winding of the 2 diagonal solenoid coils of each magnet in the quadrupolar magnet is completed to form the current loop of the single-turn wire.
2. A curved helical superconducting magnet according to claim 1, wherein: the superconducting coil and the skeleton of the superconducting magnet are provided with the same bending central shaft, the central shaft of the warm hole is not coaxial with the central shafts of the superconducting coil and the skeleton, and the bending radius of the central shaft of the warm hole is slightly smaller than that of the central shaft of the superconducting coil and the skeleton, so that the central shaft deviation of the magnetic field caused by the bending of the magnet is corrected.
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| CN115132447B (en) * | 2022-08-31 | 2022-11-11 | 中国科学院合肥物质科学研究院 | S-shaped six-pole magnet embedded groove type framework structure and turn-to-turn transition lap winding method |
| CN117080039A (en) * | 2023-09-05 | 2023-11-17 | 广东省新兴激光等离子体技术研究院 | Analysis magnetic field device and ion implanter |
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| WO2016114989A1 (en) * | 2015-01-12 | 2016-07-21 | The Regents Of The University Of California | Left-right canted-cosine-theta magnets |
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