CN116828690A - Miniaturized Heavy Ion Synchrotron - Google Patents
Miniaturized Heavy Ion Synchrotron Download PDFInfo
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- CN116828690A CN116828690A CN202310875708.0A CN202310875708A CN116828690A CN 116828690 A CN116828690 A CN 116828690A CN 202310875708 A CN202310875708 A CN 202310875708A CN 116828690 A CN116828690 A CN 116828690A
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- 238000000605 extraction Methods 0.000 claims abstract description 77
- 238000005520 cutting process Methods 0.000 claims abstract description 35
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
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- 150000002500 ions Chemical class 0.000 claims description 56
- 238000010884 ion-beam technique Methods 0.000 claims description 14
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- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 9
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- 229910052734 helium Inorganic materials 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
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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
- H05H13/00—Magnetic resonance accelerators; Cyclotrons
- H05H13/04—Synchrotrons
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Abstract
The present disclosure provides a miniaturized heavy ion synchrotron, comprising: the four deflection units are used for deflecting the beam, the deflection angle of each deflection unit is 90 degrees, and straight sections between adjacent deflection units are connected through vacuum pipelines; the four focusing units are respectively arranged on each straight section and are used for focusing the beam in the horizontal direction and the vertical direction; the high-frequency accelerating cavity is arranged on one of the straight sections and is used for accelerating beam current; the injection system is arranged on a pair of opposite straight sections and is used for introducing beam current to the miniaturized heavy ion synchrotron; the slow extraction system comprises an extraction static deflection plate and an extraction cutting magnet, wherein the extraction static deflection plate and the extraction cutting magnet are respectively arranged on the other pair of opposite straight line sections, the phase shift of the extraction static deflection plate and the extraction cutting magnet is 300 degrees, and the slow extraction system is used for extracting high-energy beam current of target energy obtained after acceleration. The ion therapeutic device can be miniaturized, and stable and reliable high-current strong beam current is provided.
Description
The present disclosure claims priority from chinese patent application No. 202310711466.1 filed at 2023, 6, 15, the entire contents of which are incorporated herein by reference.
Technical Field
The present disclosure relates to the technical field of medical devices, and in particular, to a miniaturized heavy ion synchrotron.
Background
Ion beams (meaning ions of the periodic table of hydrogen, helium, lithium, carbon and oxygen ions having mass numbers not exceeding 20, and suitable for ion therapy) have a physical effect called bragg peaks, which means that the amount of energy deposited by an ion beam in a substance is inversely related to the magnitude of the energy, and the energy release reaches a peak before the movement of the ions is stopped, and then the energy deposition is drastically reduced. Due to the existence of Bragg peak, the ion beam can accurately kill tumor cells with little damage to surrounding healthy tissues. In addition, ion beams have a higher relative biological effect than conventional radiation, i.e., the physical absorbed dose required to achieve the same biological effect (e.g., 10% survival of cells) is less than that of conventional radiation, thereby significantly reducing the number of treatments for the patient.
The existing ion treatment accelerator has large occupied area and high investment cost, so that the accelerator is difficult to popularize. The invention mainly reduces the cost of the synchrotron, including reducing the number of elements, reducing the manufacturing and mounting cost of main elements, reducing the occupied area and the like.
An existing ion treatment device (application number is 201010252492.5) deflects an ion beam by a plurality of diode magnets to form a closed track, and quadrupole magnets are arranged among the diode magnets to realize the focusing effect on the ion beam in the horizontal direction and the vertical direction. The circumference of the existing ion treatment device is larger than 50m, the weight of the single dipolar magnet is close to 20 tons, the manufacturing cost and the installation difficulty are high, and in order to install, a large gantry crane is needed, and the space requirement is high. Another ion treatment device (application No. 202110638036.2) employs a composite superconducting magnet with a composite quadrupole field on a dipole field, which is more compact than an accelerator structure consisting of conventional magnets. But the extraction scheme adopts vertical extraction, and deflection iron used for extraction can introduce dispersion in the vertical direction of the high-energy beam line. Generally, the ion beam has a certain energy dispersion, and the dispersion will increase the overall size of the ion beam, so a section of beam line is specially designed on the high-energy beam line to eliminate the dispersion. Both the introduction and the elimination of chromatic dispersion can only be through a diode magnet. Since the dipole magnet in the synchrotron typically deflects particles in the horizontal direction, dispersion in the horizontal direction is inherent, and hence the high-energy beam always needs to be subjected to dispersion cancellation in the horizontal direction, regardless of whether the beam is extracted in the horizontal direction or the vertical direction. The vertical extraction scheme increases the design difficulty and debugging difficulty of the whole high-energy beam line because dispersion elimination in both horizontal and vertical directions is required.
Disclosure of Invention
In view of the above problems, the present invention provides a porphyrinized heavy ion synchrotron to solve the above problems.
One aspect of the present disclosure provides a miniaturized heavy ion synchrotron, comprising: the direct joints among the deflection units are connected through vacuum pipelines and are used for deflecting the beam current, and the deflection angle of each deflection unit is 90 degrees; the four focusing units are respectively arranged on the straight sections and are used for focusing the beam in the horizontal direction and the vertical direction; the high-frequency accelerating cavity is arranged on one of the straight sections and is used for accelerating the beam; the injection system is arranged on a pair of opposite straight sections and is used for introducing beam current to the miniaturized heavy ion synchrotron; the slow extraction system comprises an extraction static deflection plate and an extraction cutting magnet, wherein the extraction static deflection plate and the extraction cutting magnet are respectively arranged on the other pair of opposite straight sections, the phase shift of the extraction static deflection plate and the extraction cutting magnet is 300 degrees, and the extraction static deflection plate and the extraction cutting magnet are used for extracting high-energy beam current of target energy obtained after acceleration.
According to an embodiment of the present disclosure, the miniaturized heavy ion synchrotron further includes: an ion source for generating low energy ions having an initial energy; and the linear accelerator is used for primarily accelerating the low-energy ions to obtain a medium-energy beam.
According to an embodiment of the present disclosure, the single turn injection system includes: injection cutting magnets and injection impact magnets, which are respectively arranged on a pair of opposite straight sections; the injection cutting magnet is used for injecting beam current into the miniaturized heavy ion synchrotron, and the injection impact magnet is used for giving a transverse kicker angle to the medium-energy ion beam so that the medium-energy ion beam enters into the central track of the miniaturized heavy ion synchrotron.
According to an embodiment of the present disclosure, the slow extraction system further comprises: four lead-out convex rail magnets and lead-out excitation; two of the four leading-out raised rail magnets are arranged on the straight line section where the leading-out electrostatic deflection plate is positioned and are respectively arranged on two sides of the leading-out electrostatic deflection plate; the other two raised rail magnets of the four raised rail magnets are arranged on two straight sections adjacent to the straight section where the electrostatic deflection plate is arranged and are adjacent to the deflection unit; the four leading-out convex rail magnets are used for forming local convex rails at the leading-out electrostatic deflection positions, so that the beam current approaches to the polar plate of the leading-out electrostatic deflection plate.
According to an embodiment of the present disclosure, the slow extraction system further comprises: two resonating hexapole irons and two chromaticity correcting hexapole irons; the two resonance hexapole irons are respectively arranged on the straight line sections where the leading-out electrostatic deflection plate and the leading-out cutting magnet are positioned and are adjacent to focusing units on the corresponding straight line sections, and are used for causing third-order resonance of the beam and forming a stable triangle in a phase space; the two chromaticity correction hexapole irons are respectively arranged on the other two straight line sections except the straight line sections where the lead-out electrostatic deflection plate and the lead-out cutting magnet are arranged, are adjacent to the focusing units on the corresponding straight line sections, and are used for adjusting chromaticity to enable particle lead-out phase diagrams with different energies in the beam to overlap, so that the lead-out efficiency is improved.
According to an embodiment of the present disclosure, the slow extraction system further comprises: and the extraction excitation is arranged on any section of the straight section and is used for generating a transverse high-frequency electric field so as to continuously and stably extract the beam current.
According to an embodiment of the present disclosure, the deflection unit comprises at least one superconducting secondary magnet.
According to an embodiment of the present disclosure, the focusing unit is a horizontal focusing quadrupole magnet.
According to an embodiment of the present disclosure, the linac includes: a radio frequency quadrupole field accelerator for accelerating low energy ions extracted from the ion source to an energy level of 0.6 MeV/u; a drift tube linac for further accelerating the beam from the rf quadrupolar field accelerator to an energy level of 4-7 MeV/u.
According to an embodiment of the disclosure, the operating point of the miniaturized heavy ion synchrotron is at 5/3.
The above at least one technical scheme adopted in the embodiment of the disclosure can achieve the following beneficial effects:
the miniaturized heavy ion synchrotron provided by the embodiment of the disclosure reduces the number of components in the synchrotron as much as possible, shortens the perimeter of the synchrotron, optimizes the extraction design, controls the envelope of extracted beam current so that the diode magnets in the synchrotron have the same aperture, and is convenient to process and manufacture. The whole accelerator has compact layout, and can effectively reduce the construction cost of the medical synchrotron.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of a miniaturized heavy ion synchrotron provided by an embodiment of the present disclosure;
fig. 2A schematically illustrates a trajectory diagram of a beam injection process provided by an embodiment of the present disclosure;
FIG. 2B schematically illustrates a trace of a beam forming a partial track at the induced electrostatic deflection by a track magnet;
fig. 2C schematically shows the trajectory of the beam at the last three turns before extraction and the trajectory after entering the electrostatic deflector plate.
Reference numerals:
1-a deflection unit; a 2-focusing unit; 3-a high frequency acceleration chamber; 4-leading out an electrostatic deflection plate; 5-leading out a cutting magnet; a 6-ion source; 7-linear accelerator; 8-injecting a cutting magnet; 9-injecting an impact magnet; 10-leading out a convex rail magnet; 11-extracting the excitation; 12-resonating hexapole iron; 13-chromating correction hexapole iron.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
In the present embodiment, the ion source 6 employs a laser ion source 6 for generating low energy ions having an initial energy; the linear accelerator 7 is used for primarily accelerating low-energy ions to obtain a medium-energy beam. And the synchrotron further accelerates the injected medium-energy ion beam to obtain high-energy beam current with target energy.
The linac 7 comprises a radio frequency quadrupole field accelerator for accelerating low energy ions extracted from the ion source 6 to an energy level of 0.6 MeV/u; a drift tube linac for further accelerating the beam from the rf quadrupolar field accelerator to an energy level of 4-7 MeV/u.
Fig. 1 schematically illustrates a schematic diagram of a miniaturized heavy ion synchrotron provided by an embodiment of the present disclosure.
As shown in fig. 1, the miniaturized heavy ion synchrotron provided in the embodiment of the present disclosure includes: the four deflection units 1 are respectively connected with straight sections among the deflection units 1 through vacuum pipelines and are used for deflecting beam current, and the deflection angle of each deflection unit 1 is 90 degrees; the four focusing units 2 are horizontal focusing quadrupole magnets, are respectively arranged on each linear section and are used for focusing the beam in the horizontal direction and the vertical direction; the high-frequency accelerating cavity 3 is arranged on one of the straight sections and is used for accelerating beam current; the injection system is arranged on a pair of opposite straight sections and is used for introducing beam current to the miniaturized heavy ion synchrotron; the slow extraction system comprises an extraction static deflection plate 4 and an extraction cutting magnet 5, wherein the extraction static deflection plate 4 and the extraction cutting magnet 5 are respectively arranged on the other pair of opposite straight sections, the phase shift of the extraction static deflection plate 4 and the extraction cutting magnet 5 is 300 degrees, and the slow extraction system is used for extracting high-energy beam current of target energy obtained after acceleration.
In this embodiment, the deflection unit 1 may be composed of one or more superconducting diode magnets, the processing difficulty of the large-angle superconducting diode iron is high, and the size of the whole deflection unit 1 is large due to the plurality of small-angle superconducting diode magnets. A preferred solution is the case of 2 45 degree diode magnets as shown in the figure. The superconducting diode magnet is an inclined solenoid type diode magnet or a discrete cosine type diode magnet, has the characteristics of high magnet field intensity, capability of easily combining various magnetic fields and the like, and structurally comprises a plurality of layers of coils, wherein the inner side coil generates a diode magnetic field, and the outer side coil generates a quadrupole magnetic field. A horizontal focusing quadrupole magnet is arranged on the straight line section between each deflection unit 1, and the focusing effect of the beam current in the horizontal direction and the vertical direction can be realized under the cooperation of two quadrupole magnetic fields.
The synchronous accelerator injection mode generally comprises single-circle injection, multi-circle injection, stripping injection and the like, and the single-circle injection has few related devices, and the accelerator has smaller beam acceptance degree because of only one injection, but has higher requirement on the injector for reaching the same ion number; the beam gain is smaller due to the Liuwei theorem in the multi-turn injection, and generally only has more than ten times of gain; and stripping injection, the ions in a low charge state are stripped into particles in a high charge state, so that the Liuwei theorem can be broken through, and the gain of more than 50 times is realized. The multiple turn and lift-off implants require multiple applications of the implant beam within the acceptance of the accelerator, which is several times greater than the single turn implant. The laser ion source 6 and the linear accelerator 7 are adopted, so that high enough current intensity can be provided for the synchronous accelerator, and in order to reduce the number of devices and the aperture requirement of beam current on the diode iron, a single-turn injection mode is adopted in the embodiment.
In this embodiment, the single turn injection system includes an injection cutting magnet 8 and an injection impact magnet 9. The injection cutting magnet 8 and the injection impact magnet 9 are respectively disposed on a pair of opposed straight sections. As shown in fig. 2A, the injection cutting magnet 8 injects a beam into the miniaturized heavy ion synchrotron, and the injection impact magnet 9 gives the middle energy ion beam a lateral kick angle so that it enters on the central orbit of the miniaturized heavy ion synchrotron.
In this embodiment, the slow extraction system includes an extraction electrostatic deflection plate 4, an extraction cutting magnet 5, four extraction track magnets, 2 resonant hexapole irons 12 and 2 chromaticity correcting hexapole irons 13, and an extraction excitation 11.
Two of the four leading-out raised rail magnets 10 are arranged on the straight line section where the leading-out electrostatic deflection plate 4 is positioned and are respectively arranged on two sides of the leading-out electrostatic deflection plate 4; the other two raised rail magnets of the four raised rail magnets 10 are arranged on two straight sections adjacent to the straight section where the raised electrostatic deflection plate 4 is arranged and are adjacent to the deflection unit 1; the four extraction convex rail magnets 10 are used for forming local convex rails at extraction static deflection positions, so that beam current approaches to the polar plate of the extraction static deflection plate 4, and the positions outside the local convex rails are on the central rail, thereby being beneficial to reducing the envelope of the extraction beam current, ensuring the extraction efficiency and avoiding the beam current loss at the static deflection plate in the injection and acceleration processes. As shown in fig. 2B, the lower diagram shows the leading-out convex rail, and the position of the starting point of the picture is the inlet position of the electrostatic deflection plate. The 4 lead-out track magnets 10 may also be replaced with 3 lead-out track magnets 10, such as by subtracting the track magnets before the electrostatic deflector plate 4 is led out. The 3 track magnets solution requires higher magnet strength and the track magnets need to be increased in length in order to reduce strength.
The two resonance hexapole irons 12 are respectively arranged on the straight line sections where the leading-out electrostatic deflection plate 4 and the leading-out cutting magnet 5 are positioned, and are adjacent to the focusing units 2 on the corresponding straight line sections, namely the quadrupole magnets. The two resonance hexapole irons 12 are symmetrically arranged and are used for inducing beam third-order resonance and forming a triangular stable region in a phase space, particles leaving the boundary of the triangular stable region can rapidly increase the amplitude along the boundary extension line of the boundary rail, enter the leading-out electrostatic deflection plate when the amplitude is increased to a certain degree, and then are led out through the leading-out cutting iron.
The two chromaticity correction hexapole irons 13 are respectively arranged on the other two straight line sections of the straight line sections where the static electricity removing deflection plate 4 and the lead-out cutting magnet 5 are positioned and are adjacent to the focusing units 2 on the corresponding straight line sections. The two chromaticity correction hexapole irons 13 are symmetrically arranged and are used for adjusting chromaticity to enable particle extraction phase diagrams with different energies in the beam to overlap, so that hardt conditions are met, and extraction efficiency is improved.
The extraction excitation 11 is arranged on any section of straight line section and is used for generating a transverse high-frequency electric field so that the amplitude of particles originally positioned in the triangular stable region is continuously increased and then leaves the stable region, and thus, beam extraction is continuously and stably carried out.
The high-frequency accelerating cavity 3 can accelerate or decelerate the beam, the beam in the synchrotron firstly forms a beam cluster through high-frequency adiabatic capture, the periodic movement of the beam cluster and the periodic variation of the accelerating electric field can be kept strictly synchronous by adjusting the frequency of the high-frequency cavity and the rising speed of the magnetic field, and the beam cluster can be continuously accelerated or decelerated by keeping a constant track.
Fig. 2C is a graph of the trajectory of the beam at the last three turns before extraction and the trajectory after entering the electrostatic deflector. Unlike the phase shift between the electrostatic deflection plate and the extraction cut magnet 5, which are typically employed in medical synchrotrons, which are placed on opposite long straight sections, respectively, the phase shift between them is approximately 90 deg. in the present disclosure. In the extraction design, it is often necessary to consider the distance separating the extraction beam from the circulating beam at the entrance of the magnetic cutter after deflection by the electrostatic deflector plate, which is used for mounting the pole plates of the magnetic cutter, which is theoretically dependent on the pole thickness, and determines the deflection angle of the electrostatic deflector plate,
wherein θ is a kick angle of the electrostatic deflector, β ES As a horizontal envelope function at the electrostatic deflection plate, beta MS As a horizontal envelope function at the magnetic cutter (mu) MS -μ ES ) Is the phase shift between the magnetic cutter and the electrostatic deflection plate. In the design, the static deflection plate and the extraction cutting magnet 5 are close to the horizontal focusing quadrupole magnet, so that the beta function of the positions of the static deflection plate and the extraction cutting magnet is the maximum, and the selected working point is about 5/3, and the synchronous accelerator has four periodic structures, so that when the static deflection plate and the extraction cutting magnet 5 are respectively arranged on long straight lines on opposite sides, the phase shift between the static deflection plate and the extraction cutting magnet is about 300 DEG, according to the formula, the distance gap between an extraction beam and a circulating beam can be greatly increased, and the requirement on an extraction element can be reducedThereby stably extracting the beam while reducing the size of the extraction element.
The miniaturized heavy ion synchrotron provided by the embodiment of the disclosure reduces the number of components in the synchrotron as much as possible, shortens the perimeter of the synchrotron, optimizes the extraction design, controls the envelope of extracted beam current so that the diode magnets in the synchrotron have the same aperture, and is convenient to process and manufacture. The whole accelerator has compact layout, and can effectively reduce the construction cost of the medical synchrotron.
Those skilled in the art will appreciate that the features recited in the various embodiments of the disclosure and/or in the claims may be provided in a variety of combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, the features recited in the various embodiments of the present disclosure and/or the claims may be variously combined and/or combined without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of the present disclosure.
While the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. The scope of the disclosure should, therefore, not be limited to the above-described embodiments, but should be determined not only by the following claims, but also by the equivalents of the following claims.
Claims (10)
1. A miniaturized heavy ion synchrotron, comprising:
the four deflection units (1) are connected with each other through vacuum pipelines in straight sections, and are used for deflecting beam current, and the deflection angle of each deflection unit (1) is 90 degrees;
four focusing units (2) which are respectively arranged on the straight sections and are used for focusing the beam in the horizontal direction and the vertical direction;
the high-frequency accelerating cavity (3) is arranged on one of the straight sections and is used for accelerating the beam;
the injection system is arranged on a pair of opposite straight sections and is used for introducing beam current to the miniaturized heavy ion synchrotron;
the slow extraction system comprises an extraction static deflection plate (4) and an extraction cutting magnet (5), wherein the extraction static deflection plate (4) and the extraction cutting magnet (5) are respectively arranged on the other pair of opposite straight line sections, the phase shift of the extraction static deflection plate (4) and the extraction cutting magnet (5) is 300 degrees, and the slow extraction system is used for extracting high-energy beam current of target energy obtained after acceleration.
2. The miniaturized heavy ion synchrotron of claim 1, further comprising:
an ion source (6) for generating low energy ions having an initial energy;
and the linear accelerator (7) is used for primarily accelerating the low-energy ions to obtain a medium-energy beam.
3. The miniaturized heavy ion synchrotron of claim 1, wherein the single turn injection system comprises:
an injection cutting magnet (8) and an injection impact magnet (9), the injection cutting magnet (8) and the injection impact magnet (9) being respectively arranged on a pair of opposed straight sections;
the injection cutting magnet (8) is used for injecting beam current into the miniaturized heavy ion synchrotron, and the injection impact magnet (9) is used for giving a transverse kicker angle to the medium-energy ion beam so that the medium-energy ion beam enters into the central track of the miniaturized heavy ion synchrotron.
4. The miniaturized heavy ion synchrotron of claim 1, wherein the slow extraction system further comprises:
four lead-out raised rail magnets (10);
two of the four leading-out raised rail magnets (10) are arranged on straight sections where the leading-out electrostatic deflection plates (4) are arranged and are respectively arranged on two sides of the leading-out electrostatic deflection plates (4);
the other two raised rail magnets in the four raised rail magnets (10) are arranged on two straight sections adjacent to the straight section where the electrostatic deflection plate (4) is arranged and are adjacent to the deflection unit (1);
the four leading-out convex rail magnets (10) are used for forming local convex rails at the leading-out electrostatic deflection positions so that the beam current approaches to the polar plate of the leading-out electrostatic deflection plate (4).
5. The miniaturized heavy ion synchrotron of claim 1, wherein the slow extraction system further comprises:
two resonating hexapole irons (12) and two chromaticity correcting hexapole irons (13);
the two resonance hexapole irons (12) are respectively arranged on the straight line sections where the leading-out electrostatic deflection plate (4) and the leading-out cutting magnet (5) are positioned and are adjacent to the focusing units (2) on the corresponding straight line sections, and are used for causing third-order resonance of the beam current and forming a stable triangle in a phase space;
the two chromaticity correction hexapole irons (13) are respectively arranged on the other two straight line sections except the straight line sections where the extraction static deflection plate (4) and the extraction cutting magnet (5) are arranged, are adjacent to the focusing units (2) on the corresponding straight line sections, and are used for adjusting chromaticity to enable particle extraction phase diagrams with different energies in the beam to overlap, so that extraction efficiency is improved.
6. The miniaturized heavy ion synchrotron of claim 1, wherein the slow extraction system further comprises:
and the extraction excitation (11) is arranged on any section of the straight line section and is used for generating a transverse high-frequency electric field to continuously and stably extract the beam current.
7. A miniaturized heavy ion synchrotron according to claim 1, characterized in that the deflection unit (1) comprises at least one superconducting secondary magnet.
8. A miniaturized heavy ion synchrotron according to claim 1, characterized in that the focusing unit (2) is a horizontally focusing quadrupole magnet.
9. A miniaturized heavy ion synchrotron according to claim 2, characterized in that the linac (7) comprises:
a radio frequency quadrupole field accelerator for accelerating low energy ions extracted from the ion source (6) to an energy level of 0.6 MeV/u;
a drift tube linac for further accelerating the beam from the rf quadrupolar field accelerator to an energy level of 4-7 MeV/u.
10. The miniaturized heavy ion synchrotron of claim 1, wherein the miniaturized heavy ion synchrotron has an operating point of 5/3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310711466 | 2023-06-15 | ||
| CN2023107114661 | 2023-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116828690A true CN116828690A (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310875708.0A Pending CN116828690A (en) | 2023-06-15 | 2023-07-17 | Miniaturized Heavy Ion Synchrotron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116828690A (en) |
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2023
- 2023-07-17 CN CN202310875708.0A patent/CN116828690A/en active Pending
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