CN115175434B - Beam current collecting device of laser acceleration proton beam - Google Patents
Beam current collecting device of laser acceleration proton beam Download PDFInfo
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- CN115175434B CN115175434B CN202210870543.3A CN202210870543A CN115175434B CN 115175434 B CN115175434 B CN 115175434B CN 202210870543 A CN202210870543 A CN 202210870543A CN 115175434 B CN115175434 B CN 115175434B
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- 238000001514 detection method Methods 0.000 description 2
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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
- H05H7/001—Arrangements for beam delivery or irradiation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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Abstract
The invention discloses a beam current collecting device of a laser acceleration proton beam, which relates to the technical field of particle acceleration, wherein a ternary electromagnetic quadrupole lens group is fixedly arranged on a first bracket, a second bracket is rotationally connected with a shell of the ternary electromagnetic quadrupole lens group, a permanent magnet quadrupole magnet group, a first rotating shaft and a second rotating shaft are arranged on the second bracket, the permanent magnet quadrupole magnet group comprises a first permanent magnet quadrupole magnet fixedly arranged in a first protective shell and a second permanent magnet quadrupole magnet fixedly arranged in a second protective shell, the first protective shell is in threaded connection with the first rotating shaft, the second protective shell is slidably sleeved on the first rotating shaft, the first protective shell is slidably sleeved on the second rotating shaft, and the second protective shell is in threaded connection with the second rotating shaft; the second bracket is also provided with a first driving device capable of driving the first rotating shaft to rotate and a second driving device capable of driving the second rotating shaft to rotate. The invention can realize high transmission efficiency and better energy regulation capability at the same time.
Description
Technical Field
The invention relates to the technical field of particle acceleration, in particular to a beam current collecting device of a laser acceleration proton beam.
Background
Particle accelerators not only provide great help for medical, biological and energetic physical research, but also have been widely and practically applied in various fields such as chemical industry, agricultural production, medical and health. However, due to the device breakdown threshold, the acceleration gradient of conventional rf linacs tends to be difficult to exceed 100MV/m.
With the continuous progress of high-power laser technology, laser plasma acceleration greatly reduces the space size of the accelerator and saves economic cost by virtue of an acceleration gradient three orders of magnitude larger than that of a traditional accelerator. Laser acceleration has been successful to date with a quasi-mono-energetic electron beam of energy 7.8GeV and a proton beam of up to 93 MeV. Such laser-accelerated particle beams, particularly ion beams, have become a research hotspot for applications such as cancer treatment, excitation of X-rays, nuclear fusion detection, and the like. Under the current technical conditions of laser and target, the target back sheath field acceleration is the main direction to be considered for laser ion acceleration. The target back sheath field acceleration proton beam has the characteristics of small source size, short pulse, large divergence angle, wide energy spectrum and the like. The characteristic of large divergence angle makes most protons unable to enter the target point after being transmitted for a distance, which becomes a main obstacle for its application. There is therefore a need for efficient collection and transport of particles using a beam dump system; the energy spectrum width means that this system needs to have the ability to adjust the energy collected by different targets.
The dominant transport elements used in the beam dump system are permanent magnet quadrupoles, pulsed solenoids, and electromagnetic quadrupoles. The permanent magnetic quadrupole lens has strong focusing capability, small volume and low manufacturing cost, but the magnetic field is invariable; the pulse solenoid can be in axisymmetric focusing, but the power supply system is complex and expensive; the electromagnetic quadrupole lens can conveniently adjust the magnetic field through current, but the magnetic field gradient is not high and the volume is larger. At present, a number of beam dump systems built by different research institutions have been reported: for example, four permanent magnet quadrupole lenses are used as main European extreme optics, a double pulse solenoid is used as main Germany Helmholtz heavy ion research center, and a ternary electromagnetic quadrupole lens group (three electromagnetic quadrupole magnets with opposite magnetic fields) is used as main Beijing university laser plasma laboratory. However, due to the disadvantages of the individual transport elements themselves, it is difficult for these collection systems constructed from a single element type to have a high transport efficiency, a strong energy conditioning capacity and an economical efficiency at the same time.
On the other hand, in order to introduce protons into the beam collection system before they are too divergent, it is necessary to reduce the distance from the proton source to the entrance of the beam collection system as much as possible, but since in the laser acceleration experiment system, many necessary detection devices such as a camera for focusing laser light, a radiochromic diaphragm for diagnosing proton beam, a microchannel plate, etc. are placed behind the proton source, the beam collection system cannot be simply fixedly installed in a place close to the proton source, which greatly limits its collection capability.
In summary, the drawbacks of the current beam collection system for laser-accelerated proton beams are quite evident: constrained by the spatial volume, focusing capability and aperture size of each transmission element, the transmission efficiency and energy regulation capability of the system often cannot be achieved; there are many engineering problems that the protons with large divergence angles cannot enter the collection system at all, and inherent beam loss is brought.
Disclosure of Invention
The invention aims to provide a beam current collecting device of a laser acceleration proton beam, which solves the problems of the prior art and simultaneously realizes high transmission efficiency and better energy adjustment capability.
In order to achieve the above object, the present invention provides the following solutions:
The invention provides a beam current collecting device of a laser acceleration proton beam, which comprises a first bracket, a ternary electromagnetic quadrupole lens group and a second bracket, wherein the ternary electromagnetic quadrupole lens group is fixedly arranged on the first bracket, the second bracket is rotationally connected with a shell of the ternary electromagnetic quadrupole lens group, a permanent magnet quadrupole magnet group, a first rotating shaft and a second rotating shaft parallel to the first rotating shaft are arranged on the second bracket, the permanent magnet quadrupole magnet group comprises a first permanent magnet quadrupole magnet fixedly arranged in a first protective shell and a second permanent magnet quadrupole magnet fixedly arranged in a second protective shell, the first protective shell is in threaded connection with the first rotating shaft, the second protective shell is slidably sleeved on the first rotating shaft, the first protective shell is slidably sleeved on the second rotating shaft, and the second protective shell is in threaded connection with the second rotating shaft; the second bracket is also provided with a first driving device capable of driving the first rotating shaft to rotate and a second driving device capable of driving the second rotating shaft to rotate.
Preferably, the rotary adjusting mechanism further comprises a third rotating shaft, a rotating wheel, a driving bevel gear, a driven bevel gear and a connecting frame, wherein the third rotating shaft is in running fit with the first bracket through a bearing, the rotating wheel is fixedly sleeved on the third rotating shaft, the driving bevel gear is in transmission connection with the third rotating shaft, a handle is fixedly arranged on the rotating wheel, the driven bevel gear is meshed with the driving bevel gear, the driven bevel gear is fixedly connected with the connecting frame, and the connecting frame is fixedly connected with the second bracket; the top and bottom of the casing of ternary electromagnetic quadrupole lens group set firmly respectively and have a vertical fixed axle, two the fixed axle is coaxial and respectively through the bearing with second support normal running fit, driven bevel gear with the fixed axle is coaxial.
Preferably, the first gear coaxial with the fixed shaft is fixedly arranged on the second support, the limiting frame is fixedly arranged on the shell of the ternary electromagnetic quadrupole lens group, the second gear meshed with the first gear is rotatably arranged on the limiting frame, a first scale line is arranged on the second gear, a second scale line is arranged on the limiting frame, and when the first scale line is collinear with the second scale line, the permanent magnetic quadrupole magnet group is coaxial with the ternary electromagnetic quadrupole lens group.
Preferably, the second support is provided with a cantilever corresponding to the two fixed shafts respectively, the second support is rotatably connected with the fixed shafts through the cantilever, and the cantilever is in rotary fit with the corresponding fixed shafts through bearings.
Preferably, the first driving mechanism adopts a motor, a third gear is fixedly arranged on an output shaft of the first driving mechanism, and a fourth gear meshed with the third gear is fixedly arranged on the first rotating shaft.
Preferably, the second driving mechanism adopts a motor, a fifth gear is fixedly arranged on an output shaft of the second driving mechanism, and a sixth gear meshed with the fifth gear is fixedly arranged on the second rotating shaft.
Preferably, the third rotating shaft is fixedly provided with a driving sprocket, the driving bevel gear is fixedly arranged on a fourth rotating shaft, the fourth rotating shaft is in running fit with the first bracket through a bearing, the fourth rotating shaft is fixedly provided with a driven sprocket, and the driving sprocket and the driven sprocket are wound with a chain.
Preferably, the first bracket comprises a supporting plate and a vertical plate, and the bottom end of the vertical plate is fixedly connected with the supporting plate.
Compared with the prior art, the invention has the following technical effects:
The beam current collecting device of the laser acceleration proton beam can realize high transmission efficiency and better energy adjusting capability at the same time. The invention combines the permanent magnetic quadrupole lens group and the ternary electromagnetic quadrupole lens group, and the beam current collecting system has high energy adjustability by adjusting the relative distance between the permanent magnetic quadrupole lenses and the current of the ternary electromagnetic quadrupole lens group simultaneously; secondly, since the permanent magnetic quadrupole lens has high magnetic field gradient of the order of 100T/m and is small in volume and can be used for vacuum, the permanent magnetic quadrupole lens can be very close to a laser acceleration proton source, more large-divergence-angle proton beams are collected, and good collection and transmission efficiency is realized; finally, through the ingenious mechanical structure design of the permanent magnet quadrupole magnet set integral moving system, the permanent magnet quadrupole magnet set part can withdraw from the space behind the proton source in the non-working time, so that the permanent magnet quadrupole magnet set part can be flexibly used with other experimental elements alternately, and therefore, the key engineering problem of the system is solved. The solution method has universality and can be widely applied to various experimental systems or practical application devices of the laser acceleration proton beam.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a beam dump assembly for laser-accelerated proton beams according to a first view angle;
FIG. 2 is a schematic view of a beam dump assembly for laser-accelerated proton beams according to a second aspect of the present invention;
FIG. 3 is a schematic view of a beam dump for laser-accelerated proton beams according to a third view of the present invention;
FIG. 4 is a partial cross-sectional view of a beam dump of a laser-accelerated proton beam in accordance with the present invention;
wherein: 100. a beam current collecting device for accelerating the proton beam by laser; 1. a first bracket; 101. a supporting plate; 102. a vertical plate; 2. a ternary electromagnetic quadrupole lens set; 3. a second bracket; 4. a cantilever; 5. a first protective case; 6. a second protective case; 7. a first driving device; 8. a third gear; 9. a fourth gear; 10. a second driving device; 11. a fifth gear; 12. a sixth gear; 13. a rotating wheel; 14. a handle; 15. a driven sprocket; 16. a fourth rotation shaft; 17. a drive bevel gear; 18. a driven bevel gear; 19. a connecting frame; 20. a fixed shaft; 21. a first gear; 22. a limiting frame; 23. a second gear; 24. a first rotation shaft; 25. a second rotation shaft; 26. a drive sprocket; 27. a third rotation shaft; 28. a first thread segment; 29. a second thread segment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the invention without any inventive effort, are intended to fall within the scope of the invention.
The invention aims to provide a beam current collecting device of a laser acceleration proton beam, which solves the problems of the prior art and simultaneously realizes high transmission efficiency and better energy adjustment capability.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 4: the present embodiment provides a beam current collecting device 100 of a laser acceleration proton beam, which comprises a first bracket 1, a ternary electromagnetic quadrupole lens group 2 and a second bracket 3, wherein the ternary electromagnetic quadrupole lens group 2 is fixedly arranged on the first bracket 1, the first bracket 1 comprises a supporting plate 101 and a vertical plate 102, and the bottom end of the vertical plate 102 is fixedly connected with the supporting plate 101. The second bracket 3 is rotationally connected with the shell of the ternary electromagnetic quadrupole lens group 2, and the shell of the ternary electromagnetic quadrupole lens group 2 relative to the second bracket 3 can be adjusted to rotate through a rotation adjusting mechanism.
In this embodiment, a vertical fixed shaft 20 is fixed at the top end and the bottom end of the casing of the ternary electromagnetic quadrupole lens set 2, and the two fixed shafts 20 are coaxial and are in running fit with the second bracket 3 through bearings respectively; specifically, the second bracket 3 is provided with a cantilever 4 corresponding to the two fixed shafts 20, the second bracket 3 is rotatably connected with the fixed shafts 20 through the cantilever 4, and the cantilever 4 is rotatably matched with the corresponding fixed shaft 20 through a bearing.
The rotation adjusting mechanism comprises a third rotation shaft 27, a rotating wheel 13, a driving bevel gear 17, a driven bevel gear 18 and a connecting frame 19, wherein the third rotation shaft 27 is in rotation fit with the first bracket 1 through a bearing, the rotating wheel 13 is fixedly sleeved on the third rotation shaft 27, and the driving bevel gear 17 is in transmission connection with the third rotation shaft 27; specifically, a driving sprocket 26 is fixedly arranged on the third rotating shaft 27, the driving bevel gear 17 is fixedly arranged on the fourth rotating shaft 16, the fourth rotating shaft 16 is in running fit with the first bracket 1 through a bearing, a driven sprocket 15 is fixedly arranged on the fourth rotating shaft 16, and a chain is wound on the driving sprocket 26 and the driven sprocket 15. The handle 14 is fixedly arranged on the rotating wheel 13, the driven bevel gear 18 is meshed with the driving bevel gear 17, the driven bevel gear 18 is fixedly connected with the connecting frame 19, and the connecting frame 19 is fixedly connected with the cantilever 4 below the second bracket 3; the driven bevel gear 18 is coaxial with the fixed shaft 20.
Through handle 14 rotation runner 13, runner 13 drive third axis of rotation 27 and driving sprocket 26 rotation, driving sprocket 26 passes through the chain and drives driven sprocket 15 rotation, and driven sprocket 15 drives fourth axis of rotation 16 and initiative bevel gear 17 rotation, and initiative bevel gear 17 drives driven bevel gear 18 rotation, and driven bevel gear 18 drives link 19 rotation, and link 19 drives second support 3 relative fixed axle 20 rotation.
In this embodiment, the second bracket 3 is provided with a permanent magnetic quadrupole magnet set, a first rotating shaft 24 and a second rotating shaft 25 parallel to the first rotating shaft 24, the permanent magnetic quadrupole magnet set includes a first permanent magnetic quadrupole magnet fixed in the first protective shell 5 and a second permanent magnetic quadrupole magnet fixed in the second protective shell 6, the first protective shell 5 is in threaded connection with a first threaded section 28 on the first rotating shaft 24, the second protective shell 6 is slidably sleeved on the first rotating shaft 24, the first protective shell 5 is slidably sleeved on the second rotating shaft 25, and the second protective shell 6 is in threaded connection with a second threaded section 29 on the second rotating shaft 25; the second bracket 3 is further provided with a first driving device 7 capable of driving the first rotating shaft 24 to rotate and a second driving device 10 capable of driving the second rotating shaft 25 to rotate.
The first driving mechanism adopts a motor, a third gear 8 is fixedly arranged on an output shaft of the first driving mechanism, and a fourth gear 9 meshed with the third gear 8 is fixedly arranged on a first rotating shaft 24. The second driving mechanism adopts a motor, a fifth gear 11 is fixedly arranged on an output shaft of the second driving mechanism, and a sixth gear 12 meshed with the fifth gear 11 is fixedly arranged on the second rotating shaft 25.
The first gear 21 coaxial with the fixed shaft 20 is fixedly arranged on the second bracket 3, the limit frame 22 is fixedly arranged on the shell of the ternary electromagnetic quadrupole lens group 2, the second gear 23 meshed with the first gear 21 is rotatably arranged on the limit frame 22, the first scale line is arranged on the second gear 23, the second scale line is arranged on the limit frame 22, and when the first scale line and the second scale line are collinear, the permanent magnet quadrupole magnet group is coaxial with the ternary electromagnetic quadrupole lens group 2.
The specific working principle of the beam current collecting device 100 of the laser accelerated proton beam in this embodiment is as follows:
(1) The magnetic field environment is provided by the permanent magnetic quadrupole lens group and the ternary electromagnetic quadrupole lens group 2 in a matched mode. When the device works, the permanent magnetic quadrupole magnet set is rotated around the fixed shaft 20 to be coaxial with the proton center propagation direction and the ternary electromagnetic quadrupole lens set 2 through the rotation adjusting mechanism, and whether the permanent magnetic quadrupole magnet set is coaxial with the ternary electromagnetic quadrupole lens set 2 is judged through observing whether the first scale line and the second scale line are collinear or not. After the laser accelerates to produce proton beam, the proton beam passes through the floating section with centimeter length, then sequentially passes through the central holes of the first permanent magnet quadrupole magnet, the second permanent magnet quadrupole magnet and the ternary electromagnetic quadrupole lens group 2, and is focused or diverged under the action of the quadrupole magnetic field in the central holes, and finally is converged into a small beam spot with high beam current density at the target position; its transmission matrix can be described as:
Wherein r 0 and r 0 'are respectively the transverse off-axis distance and the divergence angle of the protons after the magnetic field is applied, and r 0 and r 0' are respectively the initial transverse off-axis distance and the divergence angle of the protons (for a laser-accelerated proton beam, the initial off-axis distance and the initial divergence angle are all in Gaussian distribution), and the focusing constant K is the magnetic field gradient, m is the proton mass,/>Gamma is the lorentz factor, β=v/c, β is the dimensionless rate of the particle, v is the particle rate, c is the speed of light, and thus K is related to the magnetic field gradient and proton energy. It should be noted that for a certain laser-accelerated proton source, the velocity (i.e. particle velocity) or energy distribution of the protons is known.
In this embodiment, the first permanent magnet quadrupole magnet and the second permanent magnet quadrupole magnet are in Halbach structure, and the magnetic field gradients are 200T/m and 120T/m respectively. The highest magnetic field gradients of the ternary electromagnetic quadrupole lens set 23 (three electromagnetic quadrupole magnets with opposite magnetic fields) used were 50T/m, 25T/m and 25T/m, respectively.
Under such parameters, the highest collection efficiency corresponds to the optimal beam current collection element parameters for protons of a certain target energy, including the first and second permanent magnet quadrupole magnet positions and the actual magnetic field gradient of the ternary electromagnetic quadrupole lens set 2. The positions of the first permanent magnetic quadrupole magnet and the second permanent magnetic quadrupole magnet are controlled by the first driving device 7 and the second driving device 10, wherein the first driving device 7 is used for controlling and adjusting the distance between the proton source and the first permanent magnetic quadrupole magnet, and the second driving device 10 is used for controlling and adjusting the position of the second permanent magnetic quadrupole magnet, so that the condition of the distance between the first permanent magnetic quadrupole magnet and the second permanent magnetic quadrupole magnet is realized. In this embodiment, the position resolution is up to 3 microns; the actual magnetic field gradient of the ternary electromagnetic quadrupole lens set 2 can be adjusted between 0 and the highest magnetic field gradient by means of an electric current.
Assuming that the target position to collect the proton beam is 2.45m from the beam current collection system outlet, the collection efficiency of the system for the proton of the target collection energy is defined as:
Where n (E) is the number of protons of target energy whose target position is laterally off-axis less than 1cm and n 0 (E) is the ratio of the initial number of protons of that energy. For the parameters in this embodiment, the beam current collecting device 100 of the laser accelerated proton beam can make the collecting angle of the proton beam reach ±100mrad in 2 to 10MeV, and the collecting efficiency of the system reaches 40% to 60%.
(2) When the system is not in operation, the permanent magnetic quadrupole magnet set is rotated around the fixed shaft 20 to one side of the ternary electromagnetic quadrupole lens set 2 by the rotation adjusting mechanism, and the rotation angle of the second bracket 3 is 90 degrees in the embodiment. At this point, space is freed up behind the proton source, and other equipment required for laser acceleration experiments or applications can be placed.
The beam current collecting device 100 of the laser acceleration proton beam of the embodiment utilizes the combination of the permanent magnetic quadrupole lens group and the ternary electromagnetic quadrupole lens group, combines the design of a smart and flexible rotation adjusting mechanism, has small volume and low cost, and realizes the high collecting efficiency and the adjustable central collecting energy of the proton beam in a certain energy range; the key engineering difficulty of space limitation is effectively solved, the integral movement of the permanent magnet quadrupole magnet set can be realized, and the rear space of the proton source can be alternately used with other experimental elements.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms "top", "bottom", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principles and embodiments of the present invention have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. The utility model provides a beam current collection device of laser acceleration proton beam which characterized in that: the three-dimensional electromagnetic quadrupole lens assembly comprises a first bracket, a three-dimensional electromagnetic quadrupole lens assembly and a second bracket, wherein the three-dimensional electromagnetic quadrupole lens assembly is fixedly arranged on the first bracket, the second bracket is rotationally connected with a shell of the three-dimensional electromagnetic quadrupole lens assembly, a permanent magnet quadrupole magnet assembly, a first rotating shaft and a second rotating shaft parallel to the first rotating shaft are arranged on the second bracket, the permanent magnet quadrupole magnet assembly comprises a first permanent magnet quadrupole magnet fixedly arranged in a first protective shell and a second permanent magnet quadrupole magnet fixedly arranged in a second protective shell, the first protective shell is in threaded connection with the first rotating shaft, the second protective shell is slidably sleeved on the first rotating shaft, the first protective shell is slidably sleeved on the second rotating shaft, and the second protective shell is in threaded connection with the second rotating shaft; the second bracket is also provided with a first driving device capable of driving the first rotating shaft to rotate and a second driving device capable of driving the second rotating shaft to rotate;
The rotary adjusting mechanism comprises a third rotating shaft, a rotating wheel, a driving bevel gear, a driven bevel gear and a connecting frame, wherein the third rotating shaft is in rotating fit with the first bracket through a bearing, the rotating wheel is fixedly sleeved on the third rotating shaft and is in transmission connection with the third rotating shaft, a handle is fixedly arranged on the rotating wheel, the driven bevel gear is meshed with the driving bevel gear, the driven bevel gear is fixedly connected with the connecting frame, and the connecting frame is fixedly connected with the second bracket; the top end and the bottom end of the shell of the ternary electromagnetic quadrupole lens group are respectively fixedly provided with a vertical fixed shaft, the two fixed shafts are coaxial and are respectively in running fit with the second bracket through bearings, and the driven bevel gear is coaxial with the fixed shafts;
The first gear coaxial with the fixed shaft is fixedly arranged on the second support, the limit frame is fixedly arranged on the shell of the ternary electromagnetic quadrupole lens group, the second gear meshed with the first gear is rotatably arranged on the limit frame, the first scale line is arranged on the second gear, the second scale line is arranged on the limit frame, and when the first scale line is collinear with the second scale line, the permanent magnet quadrupole lens group is coaxial with the ternary electromagnetic quadrupole lens group.
2. The beam dump of laser-accelerated proton beams of claim 1, wherein: the second support is provided with a cantilever corresponding to the two fixed shafts respectively, the second support is connected with the fixed shafts in a rotating mode through the cantilever, and the cantilever is in rotating fit with the corresponding fixed shafts through bearings.
3. The beam dump of laser-accelerated proton beams of claim 1, wherein: the first driving device adopts a motor, a third gear is fixedly arranged on an output shaft of the first driving device, and a fourth gear meshed with the third gear is fixedly arranged on the first rotating shaft.
4. The beam dump of laser-accelerated proton beams of claim 1, wherein: the second driving device adopts a motor, a fifth gear is fixedly arranged on an output shaft of the second driving device, and a sixth gear meshed with the fifth gear is fixedly arranged on the second rotating shaft.
5. The beam dump of laser-accelerated proton beams of claim 1, wherein: the driving bevel gear is fixedly arranged on a fourth rotating shaft, the fourth rotating shaft is in running fit with the first bracket through a bearing, a driven sprocket is fixedly arranged on the fourth rotating shaft, and a chain is wound on the driving sprocket and the driven sprocket.
6. The beam dump of laser-accelerated proton beams of claim 1, wherein: the first support comprises a supporting plate and a vertical plate, and the bottom end of the vertical plate is fixedly connected with the supporting plate.
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| CN202210870543.3A CN115175434B (en) | 2022-07-22 | 2022-07-22 | Beam current collecting device of laser acceleration proton beam |
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| CN202210870543.3A CN115175434B (en) | 2022-07-22 | 2022-07-22 | Beam current collecting device of laser acceleration proton beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102793979A (en) * | 2012-07-28 | 2012-11-28 | 中国科学院近代物理研究所 | Proton or heavy ion beam cancer treatment device |
| CN109362172A (en) * | 2018-11-27 | 2019-02-19 | 中国原子能科学研究院 | A kind of high energy, high current alternating gradient cyclotron |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013150809A (en) * | 2008-05-22 | 2013-08-08 | Vladimir Yegorovich Balakin | Charged particle beam acceleration method and apparatus as part of charged particle cancer therapy system |
| WO2010019584A1 (en) * | 2008-08-11 | 2010-02-18 | Ion Beam Applications S.A. | High-current dc proton accelerator |
| CN114501767B (en) * | 2022-01-24 | 2023-02-28 | 北京大学 | Laser acceleration proton beam homogenization method and device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102793979A (en) * | 2012-07-28 | 2012-11-28 | 中国科学院近代物理研究所 | Proton or heavy ion beam cancer treatment device |
| CN109362172A (en) * | 2018-11-27 | 2019-02-19 | 中国原子能科学研究院 | A kind of high energy, high current alternating gradient cyclotron |
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