CN116489862A - Permanent magnet diffusion device for irradiation accelerator and irradiation accelerator - Google Patents
Permanent magnet diffusion device for irradiation accelerator and irradiation accelerator Download PDFInfo
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- CN116489862A CN116489862A CN202310642305.1A CN202310642305A CN116489862A CN 116489862 A CN116489862 A CN 116489862A CN 202310642305 A CN202310642305 A CN 202310642305A CN 116489862 A CN116489862 A CN 116489862A
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- permanent magnet
- irradiation accelerator
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 32
- 238000010894 electron beam technology Methods 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 7
- 239000010936 titanium Substances 0.000 abstract description 7
- 229910052719 titanium Inorganic materials 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract description 3
- 238000010408 sweeping Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
- H05H2007/048—Magnet systems, e.g. undulators, wigglers; Energisation thereof for modifying beam trajectory, e.g. gantry systems
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
The application relates to a permanent magnet diffusion device for an irradiation accelerator and the irradiation accelerator, wherein the permanent magnet diffusion device comprises: the mounting frame is used for mounting the first magnet group and the second magnet group; a first magnet group for performing a first diffusion of the electron beam; the first magnet group is arranged on the mounting frame; a second magnet group for performing a second diffusion of the electron beam; the second magnet group is arranged on the mounting frame. The permanent magnet diffusion device for the irradiation accelerator and the irradiation accelerator have no electric energy consumption, do not need an excitation power supply and a water cooling device, have simple structure and reliable operation, directly diffuse electron beams, can avoid the occurrence of tail sweeping phenomenon, and prolong the service life of a titanium window; the irradiation device is not only suitable for irradiation of regular-shape objects such as pipes, belts, plates and the like, but also has good irradiation performance on large-size irregularly-structured objects.
Description
Technical Field
The application relates to the field of irradiation accelerators, in particular to a permanent magnet diffusion device for an irradiation accelerator and the irradiation accelerator.
Background
In the application of magnetic scanning of irradiation accelerators at home and abroad, an electromagnet is a mainstream scheme. In order to ensure the irradiation quality, the waveform frequency, amplitude and the like of exciting current need to be strictly controlled; there is also a high requirement for the speed of movement of the under-beam device of the accelerator. The electron beam periodically scans the titanium window transversely to cause heating problem, so that the titanium window is easy to burn; the electron beam scanning also has the phenomenon of tail scanning, namely that the partial dose of the head and the tail in the electron beam scanning path is too much, and the uniform scanning of the object is difficult to realize.
Disclosure of Invention
To solve the above technical problems or at least partially solve the above technical problems, the present application provides a permanent magnet diffusing device for an irradiation accelerator and an irradiation accelerator.
In a first aspect, the present application provides a permanent magnet diffusing device for an irradiation accelerator, comprising:
the mounting frame is used for mounting the first magnet group and the second magnet group;
a first magnet group for performing a first diffusion of the electron beam; the first magnet group is arranged on the mounting frame;
a second magnet group for performing a second diffusion of the electron beam; the second magnet group is arranged on the mounting frame.
Preferably, the mounting frame comprises: and the first magnet group and the second magnet group are arranged on the magnetic yoke.
Preferably, the first magnet group includes: the four first magnets are respectively oppositely arranged on the magnetic yoke of the mounting frame, and the polarities of the two opposite first magnets are opposite.
Preferably, the first magnet group further includes: the first adjusting screw is connected with the magnetic yoke and the first magnet respectively and used for adjusting the distance between two adjacent first magnets.
Preferably, the magnetic force calculation expression of the first magnet group is:
wherein K represents magnetic force, q represents electric charge, e represents basic electric charge, K represents quadrupole iron gradient, m represents particle mass, and v represents particle velocity.
Preferably, the length of the long axis of the beam spot obtained after the first diffusion is:
wherein x represents the length of the long axis of the beam spot, x 0 The length of the original long axis of the beam spot is represented by K, the magnetic force of the first magnet group is represented by K, and the longitudinal movement distance of the particles is represented by s.
Preferably, the short axis length of the beam spot obtained after the first diffusion is:
wherein y represents the short axis length of the beam spot, y 0 The length of the original short axis of the beam spot is represented by K, the magnetic force of the first magnet group is represented by K, and the longitudinal movement distance of the particles is represented by s.
Preferably, the second magnet group includes: eight second magnets, wherein four second magnets are respectively oppositely arranged on the magnetic yoke of the mounting frame, and the magnetism of the four opposite second magnets is the same.
Preferably, the second magnet group further includes: the second adjusting screw is connected with the magnetic yoke and the second magnet respectively and used for adjusting the distance between two adjacent second magnets.
In a second aspect, the present application provides an irradiation accelerator comprising a permanent magnet diffusion device as described in any one of the above.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the permanent magnet diffusion device for the irradiation accelerator and the irradiation accelerator have no electric energy consumption, do not need an excitation power supply and a water cooling device, have simple structure and reliable operation, directly diffuse electron beams, can avoid the occurrence of tail sweeping phenomenon, and prolong the service life of a titanium window; the irradiation device is not only suitable for irradiation of regular-shape objects such as pipes, belts, plates and the like, but also has good irradiation performance on large-size irregularly-structured objects.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a permanent magnet diffusion device for an irradiation accelerator according to an embodiment of the present application;
FIG. 2 is a schematic state diagram of a permanent magnet diffusion device for an irradiation accelerator according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a magnetic field state of a permanent magnet diffusion device for an irradiation accelerator according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an irradiation accelerator according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Fig. 1 is a schematic structural diagram of a permanent magnet diffusion device for an irradiation accelerator according to an embodiment of the present application.
The present application provides a permanent magnet diffusing device for an irradiation accelerator, comprising:
a mounting frame 1 for mounting a first magnet group 2 and a second magnet group 3;
a first magnet group 2 for performing a first diffusion of the electron beam; the first magnet group 2 is arranged on the mounting frame 1;
a second magnet group 3 for performing a second diffusion of the electron beam; the second magnet group 3 is arranged on the mounting frame 1.
Specifically, the permanent magnet beam-scattering device is formed by combining a set of first magnet set 2 and a set of second magnet set 3. The electron beam firstly passes through the effective field areas of the first magnet group 2 and the second magnet group 3 in sequence through accelerated focusing, and the beam passes through the vacuum scanning box after being diffused, continuously diffuses in the vacuum scanning box, finally passes through the titanium window to irradiate on an object, so that the irradiation effect is realized.
In the embodiment of the present application, the mounting rack 1 includes: and the first magnet group 2 and the second magnet group 3 are arranged on the magnetic yoke.
Specifically, the number of yokes may be 1, 2 or more, and the first magnet group 2 and the second magnet group 3 may be mounted on the same yoke or may be mounted on 2 yokes, respectively.
In the embodiment of the present application, the first magnet group 2 includes: the four first magnets are respectively arranged on the magnetic yokes of the mounting frame 1 in an opposite mode, and the polarities of the two opposite first magnets are opposite.
Specifically, the first magnet set 2 is a special-configuration quadrupole magnet, two pairs of opposite first magnets are respectively arranged in the y direction of the first magnet set 2, the polarities of the first magnets are opposite to each other, the electron beam is deflected under the action of a magnetic field when passing through the special-configuration quadrupole magnet, the received focusing force enables the beam cluster to be compressed in the y direction, and the received defocusing force enables the beam cluster to be spread in the x direction to be wider. The final beam spot shape after spreading is thus like an ellipse, which is long in the x-direction and narrow in the y-direction.
In this embodiment of the present application, the length of the long axis of the beam spot obtained after the first diffusion is:
wherein x represents the length of the long axis of the beam spot, x 0 The length of the original long axis of the beam spot is represented by K, the magnetic force of the first magnet group is represented by K, and the longitudinal movement distance of the particles is represented by s.
In this embodiment of the present application, the short axis length of the beam spot obtained after the first diffusion is:
wherein y represents the short axis length of the beam spot, y 0 The length of the original short axis of the beam spot is represented by K, the magnetic force of the first magnet group is represented by K, and the longitudinal movement distance of the particles is represented by s.
Specifically, the first magnet group 2 (standard quadrupole magnet) has a characteristic of focusing in one x direction and defocusing in the other y direction on charged particles, and the magnetic force calculation expression of the first magnet group is:
wherein K represents magnetic force, q represents electric charge, e represents basic electric charge, K represents quadrupole iron gradient, m represents particle mass, and v represents particle velocity.
By proposing to construct a magnetic field of a special-configuration quadrupole magnet, the movement and diffusion of the electron beam in the magnetic field meet the design requirements.
In this embodiment, the first magnet group 2 further includes: the first adjusting screw is connected with the magnetic yoke and the first magnet respectively and used for adjusting the distance between two adjacent first magnets.
Specifically, the first adjusting screw can adjust the distance between two adjacent first magnets according to actual needs. The shape or structure of the first adjusting screw can be a common shape or structure.
In the embodiment of the present application, the second magnet group 3 includes: eight second magnets, wherein four second magnets are respectively oppositely arranged on the magnetic yoke of the mounting frame, and the magnetism of the four opposite second magnets is the same.
Specifically, the second magnet group 3 is used to correct the electron beam spot spread by the first magnet group 2. The second magnet group 3 is a special-configuration eight-pole magnet, and the special-configuration eight-pole magnet is composed of two groups of four magnetic poles with the same magnetic property. The two groups of magnetic poles are oppositely arranged in the magnetic directions of x and y, and provide a static magnetic field with central symmetry for the effective area. The electron is influenced by the magnetic pole of the special-configuration octupole magnet in the x direction, and the electron is subjected to a force directed to the z axis, so that the electron does not all form defocusing motion in the x direction, namely, the beam spot is not infinitely scattered in the x direction, and therefore, the shape of the beam spot after being scattered is converted from ellipse to rectangle.
In an embodiment of the present application, the second magnet set further includes: the second adjusting screw is connected with the magnetic yoke and the second magnet respectively and used for adjusting the distance between two adjacent second magnets.
Specifically, the second adjusting screw can adjust the distance between two adjacent second magnets according to actual needs. The shape or structure of the second adjusting screw can be a common shape or structure.
In the embodiment of the present application, as shown in fig. 1-3, the permanent magnet diffusion device is composed of a quadrupole magnet and an octapole magnet, the neodymium iron boron with the strongest magnetism is selected as a magnet material, magnetic poles with uniform surface magnetic fields and smaller relative errors are screened out, and the magnetic pole remanence is determined by comparing a simulation experiment with an actual magnetic measurement result of an actual quadrupole magnet. Because the relative difference and the mechanical error of the magnets can cause the difference between the actual magnetic field and the simulation result, in order to realize the flexible adjustment and correction of the magnetic field and eliminate the asymmetry caused by the mechanical error, the neodymium-iron-boron magnets are fixed on the adjustable magnetic yoke, the distance between the magnets is adjusted through the screw, as shown in fig. 4, along with the adjustment of the distance between the magnets, the beam current has the effects of widening, shortening, stretching and the like in the transverse direction, the longitudinal direction and the oblique direction, thereby meeting the irradiation requirements under different scenes.
In order to realize uniform irradiation of articles, the diffused electron beam meets the requirement that the irradiation unevenness is less than 10% while meeting the rectangular beam spot shape, the irradiation function can be realized after the electron beam passes through a titanium window, the beam distribution is obtained by means of Parmela particle motion simulation, the unevenness calculation formula is substituted, the irradiation unevenness is obtained, the irradiation unevenness is 6.2%, the device is applied to a 1MeV electron irradiation accelerator for carrying out electron beam diffusion experiments, and the proved unevenness index meets the design requirement, and simultaneously, the engineering feasibility of the electron beam scattering device is proved.
The specific test steps are as follows: and adjusting the position of the beam scattering device to enable the beam center to coincide with the magnetic field center, observing electron beam diffusion change under the condition of small beam, adjusting the size parameters of the device according to rules and simulation results, and verifying the engineering feasibility of the beam scattering device. The expression of the unevenness calculation formula is as follows:
referring to fig. 4, the present application provides an irradiation accelerator comprising a permanent magnet diffusion device as described above.
The permanent magnet diffusion device for the irradiation accelerator and the irradiation accelerator have no electric energy consumption, do not need an excitation power supply and a water cooling device, have simple structure and reliable operation, directly diffuse electron beams, can avoid the occurrence of tail sweeping phenomenon, and prolong the service life of a titanium window; the irradiation device is not only suitable for irradiation of regular-shape objects such as pipes, belts, plates and the like, but also has good irradiation performance on large-size irregularly-structured objects.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A permanent magnet diffusing device for an irradiation accelerator, comprising:
the mounting frame is used for mounting the first magnet group and the second magnet group;
a first magnet group for performing a first diffusion of the electron beam; the first magnet group is arranged on the mounting frame;
a second magnet group for performing a second diffusion of the electron beam; the second magnet group is arranged on the mounting frame.
2. The permanent magnet diffusing device for an irradiation accelerator according to claim 1, wherein said mounting frame comprises: and the first magnet group and the second magnet group are arranged on the magnetic yoke.
3. The permanent magnet diffusing device for an irradiation accelerator according to claim 1, wherein said first magnet group comprises: the four first magnets are respectively oppositely arranged on the magnetic yoke of the mounting frame, and the polarities of the two opposite first magnets are opposite.
4. A permanent magnet diffusing arrangement for an irradiation accelerator according to claim 3, wherein said first magnet set further comprises: the first adjusting screw is connected with the magnetic yoke and the first magnet respectively and used for adjusting the distance between two adjacent first magnets.
5. The permanent magnet diffusing device for an irradiation accelerator according to claim 1, wherein a magnetic force calculation expression of the first magnet group is:
wherein K represents magnetic force, q represents electric charge, e represents basic electric charge, K represents quadrupole iron gradient, m represents particle mass, and v represents particle velocity.
6. The permanent magnet diffusing device for an irradiation accelerator according to claim 1, wherein the length of the long axis of the beam spot obtained after the first diffusion is:
wherein x represents the length of the long axis of the beam spot, x 0 The length of the original long axis of the beam spot is represented by K, the magnetic force of the first magnet group is represented by K, and the longitudinal movement distance of the particles is represented by s.
7. The permanent magnet diffusing device for an irradiation accelerator according to claim 1, wherein a short axis length of the beam spot obtained after the first diffusion is:
wherein y represents the short axis length of the beam spot, y 0 The length of the original short axis of the beam spot is represented by K, the magnetic force of the first magnet group is represented by K, and the longitudinal movement distance of the particles is represented by s.
8. The permanent magnet diffusing device for an irradiation accelerator according to claim 1, wherein said second magnet group comprises: eight second magnets, wherein four second magnets are respectively oppositely arranged on the magnetic yoke of the mounting frame, and the magnetism of the four opposite second magnets is the same.
9. The permanent magnet diffusing arrangement for an irradiation accelerator of claim 8, wherein said second magnet set further comprises: the second adjusting screw is connected with the magnetic yoke and the second magnet respectively and used for adjusting the distance between two adjacent second magnets.
10. An irradiation accelerator comprising a permanent magnet diffusing device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310642305.1A CN116489862A (en) | 2023-06-01 | 2023-06-01 | Permanent magnet diffusion device for irradiation accelerator and irradiation accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310642305.1A CN116489862A (en) | 2023-06-01 | 2023-06-01 | Permanent magnet diffusion device for irradiation accelerator and irradiation accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116489862A true CN116489862A (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310642305.1A Pending CN116489862A (en) | 2023-06-01 | 2023-06-01 | Permanent magnet diffusion device for irradiation accelerator and irradiation accelerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116489862A (en) |
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2023
- 2023-06-01 CN CN202310642305.1A patent/CN116489862A/en active Pending
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