CN109637692B - Trajectory corrector suitable for charged particle beam - Google Patents
Trajectory corrector suitable for charged particle beam Download PDFInfo
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- CN109637692B CN109637692B CN201910082844.8A CN201910082844A CN109637692B CN 109637692 B CN109637692 B CN 109637692B CN 201910082844 A CN201910082844 A CN 201910082844A CN 109637692 B CN109637692 B CN 109637692B
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- 239000002245 particle Substances 0.000 title claims abstract description 73
- 238000013507 mapping Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 description 6
- 206010028980 Neoplasm Diseases 0.000 description 5
- 238000001959 radiotherapy Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 3
- 239000013077 target material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000002661 proton therapy Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/08—Deviation, concentration or focusing of the beam by electric or magnetic means
- G21K1/093—Deviation, concentration or focusing of the beam by electric or magnetic means by magnetic means
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The invention relates to the technical field of trajectory corrector, in particular to a trajectory corrector suitable for charged particle beams, which comprises: a first correction magnet for shifting the advancing direction of the charged particle beam by a predetermined angle; a second correction magnet for adjusting the advancing direction of the charged particle beam to be parallel to the advancing direction before the offset occurs; the second correction magnet is connected with the first correction magnet through the distance adjusting device; the distance adjusting device is used for adjusting the distance between the first correcting magnet and the second correcting magnet to a preset distance; and the control device is electrically connected with the first correcting magnet, the second correcting magnet and the distance adjusting device respectively.
Description
Technical Field
The invention relates to the technical field of trajectory correction devices, in particular to a trajectory correction device suitable for charged particle beams.
Background
Radiation therapy has become one of the important means for treating malignant tumors, and radioactive sources capable of undergoing radiation therapy can be classified into natural decay nuclides and artificial radioactive sources generated by accelerators according to their generation. Because of the advantages of simple protection, controllable intensity and the like, artificial radioactive sources have become an important tool for radiotherapy. These artificial radiation sources primarily include photons, neutrons, charged particles (including but not limited to electrons, protons, heavy ions), and the primary method of photon and neutron generation is to bombard the target material with the charged particles. The nature of artificial radiation sources is therefore to generate and transport charged particles.
The charged particles bombard the target material to generate photons and neutrons for treating tumors, for example, a traditional photon radiotherapy machine utilizes high-energy electrons to bombard a tungsten target to generate photons through bremsstrahlung; the charged particles may also be bombarded directly onto the tumor, killing the tumor by ionizing radiation, such as in electron beam radiotherapy and proton therapy machines, etc. It is therefore important to manipulate the charged particles to accurately strike the target material and the location of the tumor.
In the transportation process of charged particles, space charge force, an undesirable electromagnetic field and other interference factors can cause the charged particles to deviate from a set orbit, and finally the charged particles cannot accurately bombard a tumor or a target. Therefore, during transport of charged particles, a modulating element needs to be added to correct the trajectory of the particles. A common method is to wind a coil around a rectangular core frame to construct a corrective magnet.
The correction magnet consists of four magnet-free core frames and coils, wherein coils wound by the upper iron core and the lower iron core are used as one group, and coils wound by the left iron core and the right iron core are used as the other group. When the beam current is desired to be corrected in the vertical direction, the current of the horizontal coil is turned off (I h =0), current I is applied in the vertical direction v . In this case, a horizontal magnetic field B appears in the middle region of the rectangular frame h If the charged particle beam moves in the direction of going out from the paper surface in the middle of the rectangular frame, the charged particles are deflected in the vertical direction by the lorentz force in the vertical direction. The momentum increase experienced by the charged particles in the vertical direction at this time can be expressed as y '(y' =p y And/pz), the position of the particles in the vertical direction is changed to Δy=l×y' after passing through the straight line drift section of length L from this position, i.e., the position of the particles in the vertical direction is corrected by Δy. The horizontal direction is the same.
The traditional correction magnet has the following defects:
the adjustment of the correction quantity of the charged particles is realized by adjusting the current, if the correction distance is larger, larger current is needed, the coil heats after the current is overlarge, the resistance rises, the actual current is reduced, the accuracy is reduced, and the repeatability is poor.
Disclosure of Invention
An object of the present invention is to provide a trajectory corrector suitable for a charged particle beam, which can rapidly and precisely adjust the trajectory of the charged particle beam.
To achieve the above object, the present invention provides a trajectory corrector suitable for a charged particle beam, comprising:
a first correction magnet for shifting the advancing direction of the charged particle beam by a predetermined angle;
a second correction magnet for adjusting the advancing direction of the charged particle beam to be parallel to the advancing direction before the offset occurs;
the second correction magnet is connected with the first correction magnet through the distance adjusting device; the distance adjusting device is used for adjusting the distance between the first correcting magnet and the second correcting magnet to a preset distance;
the control device is electrically connected with the first correcting magnet, the second correcting magnet and the distance adjusting device respectively and is used for:
determining the magnitude of the preset angle according to the target deviation correcting distance of the charged particle beam and controlling the first correcting magnet to enable the advancing direction of the charged particle beam to deviate by the preset angle; and
and determining the preset distance according to the target deviation correcting distance of the charged particle beam and controlling the distance adjusting device to adjust the distance between the first correcting magnet and the second correcting magnet to the preset distance.
As a preferred embodiment, the first corrective magnet includes:
a first coil group electrically connected with the control device, the control device being configured to: the preset angle is adjusted by controlling the direction and the magnitude of the first current of the first coil group.
As a preferred embodiment, a first mapping relationship exists among the first current, a preset distance and a target deviation correcting distance, and the control device is used for determining the preset distance according to the first mapping relationship.
As a preferred embodiment, the distance adjusting device includes:
one end of the screw rod is rotationally connected with the first correction magnet, and the middle part of the screw rod penetrates through the second correction magnet and is in threaded connection with the second correction magnet;
and the other end of the screw rod is connected with the driving end of the servo motor.
As a preferred embodiment, a second mapping relationship exists among the first current, the pitch of the screw and the rotation parameter of the servo motor, and the control device is used for determining the rotation parameter of the servo motor according to the second mapping relationship.
As a preferred embodiment, the rotation parameters of the servo motor include the number of revolutions and the steering.
As a preferred embodiment, the second corrective magnet includes:
the second coil group is electrically connected with the control device, and the control device is used for: the direction and magnitude of the second current of the second coil set are controlled to adjust the advancing direction of the charged particle beam to be parallel to the advancing direction before the offset occurs.
As a preferred embodiment, the first and second currents are in opposite directions.
The invention has the beneficial effects that: the utility model provides a trajectory unscrambler suitable for charged particle beam, through setting up two distance adjustable correction magnets, change traditional through electric current adjustment offset distance into through distance adjustment offset distance, can carry out quick and accurate adjustment to the trajectory of charged particle beam.
Drawings
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, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a trajectory corrector for a charged particle beam according to an embodiment;
fig. 2 is a schematic diagram of a trajectory of a charged particle beam according to an embodiment.
In the figure:
1. a first corrective magnet;
2. a second corrective magnet;
3. a screw;
4. a control device;
5. an accelerating tube;
6. a charged particle beam.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1 to 2, the present invention provides a trajectory corrector suitable for a charged particle beam, comprising a first correction magnet 1, a second correction magnet 2, a distance adjusting device, and a control device 4.
Wherein the first corrective magnet 1 is used for shifting the advancing direction of the charged particle beam 6 by a preset angle. The second correction magnet 2 is used to adjust the advancing direction of the charged particle beam 6 to be parallel to the advancing direction before the offset occurs. The second corrective magnet 2 is connected to the first corrective magnet 1 via the distance adjusting device. The distance adjusting device is used for adjusting the distance between the first correcting magnet 1 and the second correcting magnet 2 to a preset distance. The control device 4 is electrically connected with the first correction magnet 1, the second correction magnet 2 and the distance adjusting device respectively, and the control device 4 is used for determining the magnitude of the preset angle according to the target deviation correcting distance of the charged particle beam 6 and controlling the first correction magnet 1 to enable the advancing direction of the charged particle beam 6 to deviate by the preset angle; the control device 4 is further configured to determine the magnitude of the preset distance according to the target deviation correcting distance of the charged particle beam 6 and control the distance adjusting device to adjust the distance between the first corrective magnet 1 and the second corrective magnet 2 to the preset distance. Preferably, the direction of advance of the charged particle beam 6 before deflection occurs, i.e. the direction of movement when leaving the acceleration tube 5.
Specifically, the conventional correction magnet controls the amount of forward angular displacement of the charged particle beam 6 by controlling the magnitude of the current on the correction magnet so that the displacement distance of the charged particle beam 6 satisfies the target correction distance. The trajectory corrector provided in this embodiment is configured such that the first correction magnet 1 is arranged to deflect the charged particle beam 6 by a predetermined angle, and then the deflection distance of the charged particle beam 6 is adjusted by adjusting the distance between the first correction magnet 1 and the second correction magnet 2 (the larger the predetermined distance, the larger the deflection distance; the smaller the predetermined distance, the smaller the deflection distance). In this way, the conventional way of adjusting the offset distance by adjusting the current is avoided, and the adjustment of the preset distance is faster and more accurate than the adjustment of the current, so that the trajectory of the charged particle beam 6 can be adjusted more quickly and accurately.
Preferably, the first corrective magnet 1 comprises a first coil set, which is electrically connected to the control device 4, the control device 4 being configured to: the preset angle is adjusted by controlling the direction and the magnitude of the first current of the first coil group.
Specifically, the distance between the first corrective magnet 1 and the second corrective magnet 2 is limited, but different offset distances can be obtained at the same preset distance by changing the preset angle. Thus, the range and accuracy of the trajectory corrector may be adjusted by varying the first current.
In this embodiment, a first mapping relationship exists among the first current, a preset distance and a target deviation correcting distance, and the control device 4 is configured to determine the preset distance according to the first mapping relationship. Specifically, the first current may be a default value or a correction adjustment value, the target deviation correcting distance is automatically calculated or considered to be input by the control program, and the value of the preset distance can be obtained according to the first mapping relation. There are many distance adjusting means that can be used to adjust the distance between the first corrective magnet 1 and the second corrective magnet 2, for example, using a cylinder or a motor to push the second corrective magnet 2 along a slide rail toward or away from the first corrective magnet 1, etc. Preferably, the distance adjusting device of the present embodiment includes a screw 3 and a servo motor. One end of the screw rod 3 is rotationally connected with the first correction magnet 1, the middle part of the screw rod 3 penetrates through the second correction magnet 2 and is in threaded connection with the second correction magnet 2, and the other end of the screw rod 3 is connected with the driving end of the servo motor. Further, a second mapping relationship exists among the first current, the pitch of the screw 3 and the rotation parameter of the servo motor, and the control device 4 is configured to determine the rotation parameter of the servo motor according to the second mapping relationship. Specifically, the preset distance can be determined by the screw pitch and the motor rotation parameter, so that the first current can adopt a default value or a correction adjustment value, the target correction distance is automatically calculated or considered to be input by a control program, the screw pitch is the preset value, and the rotation parameter of the servo motor can be reversely pushed according to the second mapping relation. Specifically, the rotation parameters of the servo motor include the number of revolutions and the steering.
The second corrective magnet 2 comprises a second coil set, the second coil set is electrically connected with the control device 4, and the control device 4 is used for: the direction and magnitude of the second current of the second coil set are controlled to adjust the advancing direction of the charged particle beam 6 to be parallel to the advancing direction before the offset occurs. Specifically, since the second correction magnet 2 is used to restore the advancing direction of the charged particle beam 6 to be parallel to the original advancing direction, the directions of the first current and the second current are opposite, and the magnitude of the second current is calculated by the control device 4. Specifically, the second corrective magnet 2 can compensate the scattering problem caused by the preset angle, so that the charged particles continue to move along the original advancing direction.
The traditional correction magnet has the following defects:
(1) the offset distance of the charged particle beam 6 is achieved by adjusting the magnitude of the current, if the offset distance to be corrected is large, a large current is required, and after the current is too large, the coil heats up, so that the resistance rises, the actual current is reduced, the accuracy is reduced, and the repeatability is poor.
(2) The corrected charged particle beam 6, although positionally satisfactory, is not directed forward in the direction of movement, with a divergent angle, resulting in subsequent transport difficulties.
(3) The offset distance of the charged particle beam 6 is achieved by adjusting the magnitude of the current, but lacking calibration, each adjustment needs to be determined by observing the actual position of the charged particle beam 6, which is slow. For example, the current of a desired amount of amperes for the charged particle beam 6 to be offset by 1mm can be determined by trial and error and observation.
Aiming at the defects, the track corrector provided by the embodiment has the following beneficial effects:
(1) after calibration, the current of the coils of the corrector works in a constant current mode, and the offset of the charged particle beam 6 is adjusted by adjusting the interval between the coils, so that the defect (1) can be effectively solved;
(2) the final divergence angle is corrected by adjusting the offset distance of the charged particle beam 6 through the front correction magnet and the rear correction magnet, so that the defect (2) is effectively overcome;
(3) the relationship between the distance between the two coils and the offset distance of the charged particle beam 6 is calibrated by the controller, so that the charged particle beam 6 can be quickly adjusted to a required position, and the defect (3) is effectively overcome.
The track corrector provided by the embodiment has the advantages of compact structure, simple operation and quick response time, and can efficiently and accurately control the position of the charged particle beam 6, so that the charged particle beam 6 can accurately bombard a target, and the track corrector can play a role in promoting the future accelerator field.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A trajectory corrector suitable for a charged particle beam, comprising:
a first correction magnet (1), wherein the first correction magnet (1) is used for shifting the advancing direction of the charged particle beam (6) by a preset angle;
a second correction magnet (2), wherein the second correction magnet (2) is used for adjusting the advancing direction of the charged particle beam (6) to be parallel to the advancing direction before the deviation occurs;
the second correction magnet (2) is connected with the first correction magnet (1) through the distance adjusting device; the distance adjusting device is used for adjusting the distance between the first correcting magnet (1) and the second correcting magnet (2) to a preset distance;
the control device (4), the control device (4) respectively with first correction magnet (1), second correction magnet (2) and distance adjustment device electricity are connected, the control device (4) is used for:
determining the magnitude of the preset angle according to the target deviation correcting distance of the charged particle beam (6) and controlling the first correcting magnet (1) to enable the advancing direction of the charged particle beam (6) to deviate by the preset angle; and
determining the magnitude of the preset distance according to the target deviation correcting distance of the charged particle beam (6) and controlling the distance adjusting device to adjust the distance between the first correcting magnet (1) and the second correcting magnet (2) to the preset distance;
the first corrective magnet (1) comprises:
a first coil group electrically connected with the control device (4), the control device (4) being configured to: the direction and the magnitude of the first current of the first coil group are controlled to adjust the preset angle;
a first mapping relation exists among the first current, a preset distance and a target deviation correcting distance, and the control device (4) is used for determining the preset distance according to the first mapping relation;
the distance adjustment device includes:
the middle part of the screw rod (3) penetrates through the second correcting magnet (2) and is in threaded connection with the second correcting magnet (2);
the other end of the screw rod (3) is connected with the driving end of the servo motor;
and a second mapping relation exists among the first current, the screw pitch of the screw (3) and the rotation parameter of the servo motor, and the control device (4) is used for determining the rotation parameter of the servo motor according to the second mapping relation.
2. The trajectory corrector for a charged particle beam according to claim 1, characterized in that the rotation parameters of the servo motor comprise the number of revolutions and the steering.
3. Trajectory corrector suitable for a charged particle beam according to claim 1, characterized in that said second corrective magnet (2) comprises:
a second coil set electrically connected to the control device (4), the control device (4) being configured to: the direction and magnitude of the second current of the second coil group are controlled to adjust the advancing direction of the charged particle beam (6) to be parallel to the advancing direction before the offset occurs.
4. The trajectory corrector for a charged particle beam of claim 3, wherein the first and second currents are in opposite directions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910082844.8A CN109637692B (en) | 2019-01-23 | 2019-01-23 | Trajectory corrector suitable for charged particle beam |
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| CN201910082844.8A CN109637692B (en) | 2019-01-23 | 2019-01-23 | Trajectory corrector suitable for charged particle beam |
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| CN109637692B true CN109637692B (en) | 2023-12-19 |
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| CN117113793B (en) * | 2023-10-23 | 2024-01-26 | 之江实验室 | Simulation method for particle transport in magnetic confinement charged particle imaging system |
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| JP4604096B2 (en) * | 2008-02-29 | 2010-12-22 | 株式会社日立ハイテクノロジーズ | Charged particle beam equipment |
| WO2011058833A1 (en) * | 2009-11-10 | 2011-05-19 | 三菱電機株式会社 | Particle beam radiation system and particle beam radiation method |
| US8592761B2 (en) * | 2011-05-19 | 2013-11-26 | Hermes Microvision Inc. | Monochromator for charged particle beam apparatus |
| CN209561018U (en) * | 2019-01-23 | 2019-10-29 | 深圳铭杰医疗科技有限公司 | Track rectifier suitable for charged particle beam |
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| CN1404618A (en) * | 2000-01-24 | 2003-03-19 | Ict半导体集成电路测试有限公司 | Column for a charged particle beam device |
| JP2002203492A (en) * | 2000-12-27 | 2002-07-19 | Sony Corp | Electron gun for cathode-ray tube and cathode-ray tube |
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