CN113709960A - Beam splitting device, system, method and application - Google Patents
Beam splitting device, system, method and application Download PDFInfo
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- CN113709960A CN113709960A CN202110992967.2A CN202110992967A CN113709960A CN 113709960 A CN113709960 A CN 113709960A CN 202110992967 A CN202110992967 A CN 202110992967A CN 113709960 A CN113709960 A CN 113709960A
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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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- 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
- H05H2007/002—Arrangements for beam delivery or irradiation for modifying beam trajectory, e.g. gantries
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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
- H05H2007/004—Arrangements for beam delivery or irradiation for modifying beam energy, e.g. spread out Bragg peak devices
Abstract
The invention relates to a beam splitting device, a beam splitting system, a beam splitting method and application, wherein the beam splitting system comprises the following components: radio frequency deflection chamber, first beam pipeline (drift section 1), four pole iron, second beam pipeline (drift section 2) and the cutting magnet of establishing ties in proper order, the radio frequency deflection chamber includes outer conductor and inner conductor, be provided with the beam passageway on the outer conductor, the inner conductor is used for right horizontal electric field and horizontal magnetic field are applyed to the beam that the beam passageway flows to produce horizontal momentum, the outer conductor passes through the end cover with the inner conductor and is connected. The device can split the strong current beam at ns-level time interval and provide beam current for a plurality of different application terminals, thereby improving the utilization efficiency of the strong current beam current.
Description
Technical Field
The invention relates to a beam splitting device, a beam splitting system, a beam splitting method and application, in particular to a rapid beam splitting device, a beam splitting system, a beam distribution method and application for improving utilization efficiency of a high-intensity beam, and belongs to the technical field of beam modulation of a particle accelerator.
Background
The particle accelerator can generate a particle beam with high-energy high-current, and is used for scientific and physical experiment research and a series of industrial applications such as isotope production, nuclear pore membrane manufacturing, material irradiation, a neutron source, muir beam generation, particle cancer treatment and the like. Different experimental terminals or application terminals have different requirements on beam current intensity, pulse length, repetition frequency and energy. Along with the development of the high-power high-current particle accelerator, the beam current intensity which can be led out by the particle accelerator is far higher than the requirement of a single terminal, if the beam current can be led out partially through the beam splitting device according to the requirement of the terminal on different energies, and further distributed to a plurality of terminals through the beam splitting device, the utilization efficiency of the high-current beam is greatly improved.
The beam repetition frequency is high, the beam cluster spacing is small and is only nanosecond level; and the beam energy is high, the magnetic rigidity is large, and the separation in a short drift distance is difficult. The beam splitting device is fast, compact and efficient, can effectively split beams with nanosecond-level beam intervals in a compact space, achieves screening of single beam clusters, and guarantees that the dynamic quality of the beams is not affected, so that the requirement that multiple terminals supply beams simultaneously is met.
Disclosure of Invention
Aiming at the technical problems, the invention provides a beam splitting device, a system, a method and an application, the device leads out the beam at different energies according to the requirements of different physical experiments or industrial applications through a quick beam splitting device, modulates the beam into different time structures and space distributions, and provides the beam for a plurality of different application terminals, thereby solving the problem that the prior art can not effectively split the high repetition frequency, high energy and high current beams with nanosecond-level beam intervals in a compact space and screen single beams.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a beam splitting apparatus, comprising:
radio frequency deflection chamber, first beam pipeline (drift section 1), four pole iron, second beam pipeline (drift section 2) and the cutting magnet of establishing ties in proper order, the radio frequency deflection chamber includes the outer conductor and sets up inner conductor in the outer conductor, be provided with the beam passageway on the outer conductor, the inner conductor is used for right horizontal electric field and horizontal magnetic field are applyed to the beam that the beam passageway flows out to produce horizontal momentum.
The radio frequency resonant cavity deflection cavity is characterized in that the outer conductor is of a hollow cylindrical structure with two open ends, inner conductors extending into the cylinder from the two open ends along the axial direction of the outer conductor are arranged in the outer conductor, the outer conductor and the inner conductors are connected through end covers, the inner conductors are of a hollow cylindrical structure with one open end, the closed ends of the two inner conductors are close to each other, a gap is reserved between the closed ends of the two inner conductors, and beam current channels penetrating through the cylinder wall of the outer conductor are symmetrically arranged in the direction axially vertical to the outer conductor.
The second aspect of the invention provides a beam splitting system, which comprises the beam splitting device, wherein the beam splitting system comprises a plurality of beam splitting devices and an acceleration module or a deceleration module which are sequentially and alternately connected in series, and the acceleration module or the deceleration module is used for accelerating or decelerating the beam transmitted by the beam splitting devices so as to meet the energy requirement of an experimental terminal or an application terminal.
The beam splitting system preferably has at least one secondary beam splitter on each beam splitter, and the secondary beam splitters have the same composition structure as the beam splitters and are used for further splitting beams of the beams transmitted by the beam splitters again so as to meet the requirements of an experimental terminal or an application terminal.
Preferably, the secondary beam splitting device includes a single group of beam splitting devices or a plurality of groups of parallel beam splitting devices, the single group of beam splitting devices is used for splitting the beam into two beams or three beams, and the plurality of groups of parallel beam splitting devices are used for splitting the beam into more than three beams.
The beam splitting system preferably further comprises an ion source and a radio frequency quadrupole field accelerator, wherein beams generated by the ion source enter the beam splitting device and the acceleration module or the deceleration module which are sequentially and alternately connected in series after passing through the radio frequency quadrupole field accelerator.
The third aspect of the present invention provides a beam current distribution method, which includes the following steps:
the beam generated by the ion source is modulated into a plurality of micro beam groups after passing through the radio frequency quadrupole field accelerator, and the micro beam groups enter the beam splitting device and the acceleration module or the deceleration module which are sequentially and alternately connected in series;
the beam group enters different terminals after beam splitting and acceleration are finished in the beam splitting device and the acceleration module or the deceleration module, so that the requirements of different experimental terminals or application terminals are met.
In the beam distribution method, preferably, when a beam group passes through the beam splitting device, a transverse momentum is generated under the combined action of a transverse electric field and a transverse magnetic field in the radio frequency deflection cavity, and the magnitude and the direction of the transverse momentum of a single beam group are adjusted by adjusting the frequency of the radio frequency deflection cavity and the phase of the beam group relative to the cavity, so as to lead out or split the beam group;
the undivided beam group coming out of the radio frequency deflection cavity enters the first beam flow pipeline (drift section 1), the beam group drifts to different directions, the undeflected beam group continues to move along an initial track, the transverse distance of the beam group is primarily separated, the unextracted beam group enters the quadrupole iron, and the quadrupole iron focuses the beam group and separates expanded beams;
and the beam group enters the second beam pipeline (the drift section 2) from the quadrupole iron, the transverse distance of the beam group is further enlarged, and finally the beam group enters different beam pipelines through the cutting magnet to finish beam splitting.
In the beam current distribution method, preferably, the beam current led out from the beam current splitting device can be further split by the secondary beam splitting device, so that simultaneous beam current supply of multiple terminals is realized.
The fourth aspect of the present invention provides an application of the above beam distribution method in a medical particle accelerator, an isotope production accelerator, a nuclear track membrane production accelerator, a material irradiation accelerator, a muon generation accelerator, a neutron source, or a method of simultaneously providing beams to a plurality of different application terminals.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention can effectively split the high-energy high-intensity beam with the beam interval at ns level, realizes the screening of single beam groups and ensures that the dynamic quality of the beam is not influenced.
2. According to the invention, high-energy high-intensity beams generated by the accelerator are applied and tested by leading out part of beams at different energies through the rapid beam splitting device according to different industrial and scientific research requirements, and the led-out beams are distributed to each terminal through the further secondary beam splitting device according to the requirements of each test terminal or application terminal, so that the requirement that multiple test terminals or multiple application terminals use the beams simultaneously is met, and the utilization efficiency of the high-intensity beams is greatly improved.
3. The core of the beam splitting device and the secondary beam splitting device is a compact, efficient and stable radio frequency resonant cavity, and the size of the cavity is smaller under the same cavity frequency, so that the space size of the whole beam splitting device can be effectively reduced; the shunt impedance is higher, and larger transverse momentum can be provided for the beam group passing through the cavity under the same cavity consumption, so that the longitudinal length of the whole beam splitting device is shortened; and the inner and outer conductors are mutually supported, so that the deformation of the cavity is smaller when the interference of the outer temperature, pressure, Lorentz force and the like is responded, the frequency of the cavity is more stable, the beam splitting is more stable, and the quality of the beam group is better.
4. The invention realizes the shaping and beam splitting of any time structure of the beam in the middle and high energy sections, realizes the screening of single beam clusters, improves the utilization efficiency of the high-current beam, and simultaneously meets the requirement of simultaneously supplying beams by a plurality of different terminals.
5. The radio frequency resonance structure is efficient and compact, high in beam splitting efficiency and good in structural stability.
Drawings
Fig. 1 is a schematic diagram of a compact and efficient beam splitting apparatus and a schematic diagram of changes in a beam trajectory before and after a beam passes through the beam splitting apparatus, according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of beams with different energies on a particle accelerator, which are extracted by a beam splitting device and further split and distributed to terminals according to embodiment 2 of the present invention;
fig. 3 is a schematic diagram of a core component rf deflection cavity in a compact and efficient beam-splitting apparatus provided in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of adjusting the cavity frequency and the phase of the beam relative to the cavity to equally divide the initial beam into two beams according to embodiment 2 of the present invention;
fig. 5 is a schematic diagram of adjusting the cavity frequency and the phase of the beam current relative to the cavity to divide the initial beam current into three uneven beams according to embodiment 2 of the present invention;
fig. 6 is a schematic view of combined beam splitting performed by a multi-stage beam splitting apparatus according to embodiment 2 of the present invention;
fig. 7 is a schematic view of combined beam splitting of another multi-stage beam splitting device provided in embodiment 2 of the present invention
The respective symbols in the figure are as follows:
1-an outer conductor; 2-an inner conductor; 3-a beam current channel; 4-end cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," "third," "fourth," "upper," "lower," "left," and similar terms in the context of the present invention do not denote any order, quantity, or importance, but rather the terms "first," "second," "third," "fourth," "upper," "lower," "left," and similar terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The current beam extraction and beam splitting techniques of particle accelerators include the following:
1) and (3) respectively adjusting beam parameters of the accelerator according to the requirements of each terminal, wherein the requirements of one terminal are only met once, and the beam switching at different terminals is completed by a deflection magnet. Taking two terminals a and B as an example, in the existing technical scheme, beam parameters of an accelerator are generally modulated according to the beam requirement of a, and then the beam is led out to the terminal a through a deflection magnet. And after the irradiation of the terminal A is finished, adjusting beam parameters of the accelerator according to the beam demand of the terminal B, and leading the beam to the terminal B through the deflection magnet. One disadvantage of this solution is that the utilization efficiency of the beam is low, and especially, the beam required by many physical experiments is only 1/10 or even lower than the beam provided by the accelerator, for example, when a neutron spectrum is measured by using a time-of-flight method, the space between the beamlets needs to be enlarged from nanosecond level to microsecond level to realize first thyme picking of the beamlets, and the waste of the beam is more significant.
2) The beam is split by the medium-high energy through the radio frequency resonant cavity section, and the requirements of a plurality of terminals are met. The beam splitting efficiency is low, and the beam can be split only by drifting of dozens of meters to hundreds of meters; secondly, when the proton and the heavy ion are subjected to beam splitting, the cavity is large in size and poor in mechanical property, and the beam quality is poor due to the fact that the influence of external pressure, temperature and Lorentz force is large during operation; thirdly, the energy extracted by the beam is single, and the requirements of various different energies cannot be met.
The invention discloses a beam splitting device and a beam distribution method.A beam generated by an ion source is modulated into one micro beam group after passing through a radio frequency quadrupole accelerator (RFQ), and the micro beam group enters a series of acceleration modules or deceleration modules to be gradually accelerated or decelerated. The more acceleration or deceleration modules a beam experiences, the higher or lower its energy. A beam extraction device is arranged behind each section of acceleration module or deceleration module, and beam splitting extraction can be carried out after different acceleration modules or deceleration modules are selected according to energy requirements of different experiment terminals and application terminals. The beam splitting device comprises a radio frequency resonant cavity, a first beam pipeline (drift section 1), four-pole iron, a second beam pipeline (drift section 2) and a cutting magnet. When the beam current passes through the beam splitting device, the beam current firstly passes through a set of radio frequency deflection cavity, and generates transverse momentum under the combined action of a transverse electric field and a transverse magnetic field in the cavity. By adjusting the frequency of the cavity and the phase of the beam cluster relative to the cavity, the magnitude and direction of the lateral momentum of the individual beam clusters can be adjusted. The deflection force can be used for leading out part of beam current from a main beam current and can also be used for splitting the led-out beam current. After the beam current comes out of the radio frequency deflection cavity, the beam current enters a section of vacuum first beam current pipeline (a drift section 1), under the action of transverse momentum, a beam group starts to drift towards different directions, and the beam group which is not subjected to the transverse deflection action in the radio frequency deflection cavity moves along an initial track continuously. After passing through the drift section 1, the transverse spacing of the beam groups is primarily separated, and the beam groups to be led out deviate from the original beam orbit. And then the beam enters a group of quadrupole magnets, and the quadrupole magnets can focus the beam group to reduce the transverse emittance of the beam group and further expand the separation of the beam group. After the beam current comes out of the quadrupole iron, the beam current passes through the drift (drift section 2) of the second vacuum pipeline again, and the transverse distance of the beam group is further enlarged. And finally, the beam passes through a group of cutting magnets and enters different beam pipelines to finish beam splitting.
Example 1
The present embodiment provides a beam splitting apparatus, and the structure thereof will be described in detail below.
Referring to fig. 1, the beam splitting apparatus includes: a radio frequency resonant cavity; a drift section 1; four-pole iron; drift section 2 and a cutting magnet, which are connected in series.
The radio frequency deflection cavity adopts a double-quarter-wavelength cavity structure and consists of an outer conductor 1, an inner conductor 2, an end cover 4 and a beam pipeline 3. Under the same cavity frequency, the size of the double quarter-wavelength cavity is smaller, so that the space size of the whole beam splitting device can be effectively reduced; the shunt impedance is higher, and larger transverse momentum can be provided for beam current passing through the cavity under the same cavity consumption, so that the longitudinal length of the whole beam splitting device is shortened; and the inner and outer conductors are mutually supported, so that the deformation of the cavity is smaller when the interference of the outer temperature, pressure, Lorentz force and the like is responded, the frequency of the cavity is more stable, the beam splitting is more stable, and the beam quality is better. The radio frequency deflection cavity structure is used for beam splitting for the first time, is suitable for multi-energy extraction and multi-terminal beam supply in an accelerator with high current intensity, greatly reduces the space size and the system redundancy of a beam splitting system, can effectively reduce the construction cost, and has important significance for practical industrial application.
The drift section 1 is a section of vacuum beam pipeline, and the beam group coming out of the cavity is gradually separated in the drift tube under the action of transverse momentum. The size of the drift tube needs to consider the beam envelope after the beam group is separated.
The quadrupole iron mainly plays two roles, one is to transversely focus the beam cluster and improve the quality of the beam; another aspect is to further expand the separation of the bunches.
The drift section 2 is a section of vacuum beam pipeline, and the beam distance of the beam from the quadrupole iron is further increased through further drift. The separation of the beam group in this section is much larger than that in the first section of drift tube, and the size of the drift tube needs to be correspondingly increased. The beam current exiting the drift tube 2 is required to achieve the separation of the beam clusters to achieve the accepted separation distance of the cutting magnet.
After the cutting magnet comes out, the separated beam current advances along a new beam current pipeline and goes to a terminal or further beam splitting is carried out again.
The beam splitting device can be used for beam extraction and modulation of a linear accelerator and a ring accelerator.
According to different beam requirements of each terminal, extracting beams of an accelerator at different energies and distributing the beams to each terminal;
the radio frequency deflection cavity can be realized by a normal temperature radio frequency structure or a superconducting radio frequency structure, and depends on beam energy and a beam splitting angle.
The deflection cavity can realize fast beam splitting by ns ascending edge and descending edge, and the quality of adjacent beam clusters is not influenced while the beam is split.
Example 2
step A: the beam current generated from the ion source is modulated into a micro beam group after passing through the radio frequency quadrupole field accelerator, and the micro beam group enters an acceleration module or a deceleration module (an acceleration module or a deceleration module 1, an acceleration module or a deceleration module 2, and an acceleration module or a deceleration module N) to be accelerated step by step. Each acceleration module or each deceleration module is followed by a beam splitting device (beam splitting device 1, beam splitting device 2.. times beam splitting device (N +1)) and a secondary beam splitting device (beam splitting device 1-1, beam splitting device 1-2.. times beam splitting device N-2), so that simultaneous beam supply of a plurality of different terminals (terminal 1-1-1, terminal 1-1-2.. times terminal (N +1) -3) is realized. The more acceleration or deceleration modules a beam experiences, the higher or lower its energy. According to the energy requirements of different experimental terminals and application terminals, split beam extraction can be performed after different acceleration modules or deceleration modules are selected.
And B: when the beam current passes through the beam splitting device, the beam current firstly passes through a set of radio frequency deflection cavity, and generates transverse momentum under the combined action of a transverse electric field and a transverse magnetic field in the cavity. The size and direction of the transverse momentum of a single beam group can be adjusted by adjusting the frequency of the cavity and the phase of the beam current relative to the cavity. The deflection force can be used for leading out part of beam groups from a main beam line and can also be used for splitting the led-out beam. After the beam comes out of the radio frequency deflection cavity, the beam enters a section of vacuum beam pipeline (a drift section 1), under the action of transverse momentum, a beam group starts to drift to different directions, and the beam group which is not subjected to the transverse deflection action in the radio frequency resonant cavity in the front continues to move along an initial track. After passing through the drift section 1, the transverse spacing of the beam groups is primarily separated, and the beam groups to be led out deviate from the original beam orbit. And then the beam enters a group of quadrupole magnets, and the quadrupole magnets can focus the beam group to reduce the transverse emittance of the beam group and further expand the separation of the beam group. After the quadrupole iron comes out, the beam current passes through the drift of a section of vacuum pipeline (drift section 2) again, and the transverse distance of the beam group is further enlarged. And finally, the beam passes through a group of cutting magnets and enters different beam pipelines to finish beam splitting.
And C: after the beam led out from the original beam track enters the beam pipeline, further beam splitting can be realized through a secondary beam splitting device, and simultaneous beam supply of multiple terminals is realized.
And D, the core of the beam splitting device is a radio frequency deflection cavity, different beam splitting effects can be obtained by adjusting the frequency of the cavity, and not only can average beam splitting be obtained, but also uneven beam splitting combination can be obtained.
Step E: through the single group of beam splitting devices, the beam current can be effectively split into three beams at most. More beam lines can be obtained by combining a plurality of groups of beam splitting devices. For example, 8 paths of average beam current can be obtained by 3 types of beam splitting devices with 7 sets in total (as shown in fig. 7); by using 4 sets of beam splitting devices in total, 9 paths of average beam current can be obtained (as shown in figure 6). By more complicated adjustment of the phase of the beam and more cavity shapes, a more complicated beam line can be obtained.
Example 3
different industrial applications and physical experiments have different requirements on beam energy, the beam current intensity provided by the modern high-power particle accelerator with high current is far higher than that of single industrial application, if the requirements of industry and scientific research which cannot be met are met, partial beams can be led out through the rapid beam splitting device at different energies to be applied and tested, and the simultaneous beam supply of multiple terminals is realized through the further beam splitting device, so that the utilization efficiency of the high-current beams is greatly improved.
The beam distribution method can be applied to a medical particle accelerator, an isotope production accelerator, a nuclear track membrane production accelerator, a material irradiation accelerator, a muon production accelerator, a neutron source and the like, and provides beams for a plurality of different application terminals.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A beam splitting apparatus, comprising:
radio frequency deflection chamber, first beam pipeline, four pole iron, second beam pipeline and the cutting magnet of establishing ties in proper order, the radio frequency deflection chamber includes outer conductor (1) and sets up inner conductor (2) in outer conductor (1), be provided with beam passageway (3) on outer conductor (1), inner conductor (2) are used for right horizontal electric field and horizontal magnetic field are applyed to the beam that beam passageway (3) flow out to produce horizontal momentum.
2. The beam splitting device according to claim 1, wherein the outer conductor (1) is a hollow cylindrical structure with two open ends, inner conductors (2) extending from the two open ends to the inside of the cylinder along the axial direction of the outer conductor (1) are arranged in the outer conductor (1), the outer conductor (1) and the inner conductors (2) are connected through end covers (4), the inner conductors (2) are a hollow cylindrical structure with one open end, the closed ends of the two inner conductors (2) are close to each other with a gap left therebetween, and the beam passages (3) penetrating through the wall of the outer conductor (1) are symmetrically arranged in the direction perpendicular to the axial direction of the outer conductor (1).
3. A beam splitting system comprising the beam splitting apparatus of claim 2,
the beam splitting system comprises a plurality of beam splitting devices and an acceleration module or a deceleration module which are sequentially and alternately connected in series, wherein the acceleration module or the deceleration module is used for accelerating or decelerating the beam transmitted by the beam splitting devices so as to meet the energy requirement of an experiment terminal or an application terminal.
4. The beam splitting system according to claim 3, wherein each beam splitting device is provided with at least one secondary beam splitting device, and the secondary beam splitting device has the same composition structure as the beam splitting device, and is configured to further split the beam transmitted by the beam splitting device again, so as to meet the requirements of an experimental terminal or an application terminal.
5. The beam splitting system of claim 4, wherein the secondary beam splitting device comprises a single set of beam splitting devices or multiple sets of parallel beam splitting devices, the single set of beam splitting devices is configured to split the beam into two or three beams, and the multiple sets of parallel beam splitting devices are configured to split the beam into three or more beams.
6. The beam splitting system according to any one of claims 3 to 5, further comprising an ion source and a radio frequency quadrupole accelerator, wherein a beam generated by the ion source passes through the radio frequency quadrupole accelerator and then enters the beam splitting device and the acceleration module or the deceleration module which are alternately connected in series in sequence.
7. A beam current distribution method, characterized in that, the beam current splitting system of claim 6 is adopted, and specifically comprises:
the beam generated by the ion source is modulated into a plurality of micro beam groups after passing through the radio frequency quadrupole field accelerator, and the micro beam groups enter the beam splitting device and the acceleration module or the deceleration module which are sequentially and alternately connected in series;
the beam current enters different terminals after beam splitting and acceleration or deceleration are finished in the beam current beam splitting device and the acceleration module or the deceleration module, so that the requirements of different experiment terminals or application terminals are met.
8. The beam current distribution method according to claim 7, wherein when the beam current passes through the beam current splitting device, a transverse momentum is generated under the combined action of a transverse electric field and a transverse magnetic field in the radio frequency deflection cavity, and the magnitude and direction of the transverse momentum of a single beam group are adjusted by adjusting the frequency of the radio frequency deflection cavity and the phase of the beam group relative to the cavity, so as to extract or split the beam current;
the beam groups which are not separated and led out from the radio frequency deflection cavity enter the first beam flow pipeline, the beam groups which are subjected to different transverse momentum drift to different directions, the beam groups which are not deflected continue to move along an initial track, the transverse spacing of the beam groups is primarily separated, the beam groups which are not led out enter the quadrupole iron, and the quadrupole iron focuses the beam groups and expands the separation of the beam groups;
and the beam group enters the second beam pipeline from the quadrupole iron, the transverse distance of the beam group is further enlarged, and finally the beam group enters different beam pipelines through the cutting magnet to finish beam splitting.
9. The beam current distribution method according to claim 7, wherein the beam current extracted from the beam current splitting device can be further split by the secondary beam splitting device, thereby realizing simultaneous beam current supply at multiple terminals.
10. Use of a beam distribution method as claimed in any one of claims 7 to 9 in a medical particle accelerator, an isotope production accelerator, a nuclear track membrane production accelerator, a material irradiation accelerator, a muon production accelerator, a neutron source or for providing beams to a plurality of different application terminals simultaneously.
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|---|---|---|---|---|
| CN116364325A (en) * | 2023-03-06 | 2023-06-30 | 中子高新技术产业发展(重庆)有限公司 | Multifunctional medical isotope production device based on accelerator |
| CN116364325B (en) * | 2023-03-06 | 2024-05-03 | 中子高新技术产业发展(重庆)有限公司 | Multifunctional medical isotope production device based on accelerator |
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