CN106804091A - A kind of cyclotron isochronous magnetic field shimming method and system - Google Patents
A kind of cyclotron isochronous magnetic field shimming method and system Download PDFInfo
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- CN106804091A CN106804091A CN201710167892.8A CN201710167892A CN106804091A CN 106804091 A CN106804091 A CN 106804091A CN 201710167892 A CN201710167892 A CN 201710167892A CN 106804091 A CN106804091 A CN 106804091A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
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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
- H05H13/005—Cyclotrons
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Abstract
The invention discloses a kind of cyclotron isochronous magnetic field shimming method and system.First by finite element modeling with calculate at cyclotron magnetic pole different radii unit edge area of cut magnetic field radially knots modification, the correlation matrix for characterizing cut vector with global magnetic field knots modification is calculated using some groups of knots modifications.After survey magnetic is carried out to the main magnet processed, the edge cut according to required for a deviation and correlation matrix when waiting can be calculated inversely after Continuous maching coordinate is obtained by interpolation, is processed using Digit Control Machine Tool along radius distribution vector to pole edge.Magnet field shim method provided by the present invention considers radial edges field-effect during having a snack, in combination with FEM calculation magnetic knot is surveyed with actual really, with predictable, high accuracy feature, and magnet field shim effect is predicted based on correlation matrix, further increase and have a snack reliability, requirement during satisfaction etc., is greatly saved the time of having a snack and workload by after generally being had a snack at 2 times.
Description
Technical field
The invention belongs to the design of cyclotron main magnet and Development Techniques field, add more particularly, to one kind convolution
Fast device isochronous magnetic field shimming method and system.
Background technology
Cyclotron is that one kind does circumnutation using fixed magnetic field constraint charged particle, while using fixed frequency
High-frequency electric field carries out the device that from coil to coil accelerates repeatedly to charged particle；Mainly include ion gun, main magnet system, radio frequency system,
Extraction system and vacuum system.Wherein, main magnet system produces the magnetic field of constraint charged particle using coil current excitation pole,
Formed along the isochronous magnetic field distribution of radius modulation with amendment is had a snack by the design of trimming coils, or pole form, met
The stabilization of cyclotron frequency in particle accelerating process.
In the isochronous magnetic field of cyclotron is had a snack, mainly there are two methods to adjust the isochronism distribution in magnetic field：
(1) design and installation multiply trimming coils are distributed at magnetic pole different radii, can by carrying out configuration to each group trimming coils electric current
Isochronous magnetic field required for realizing, this method has larger flexibility and a configurability, but realize complicated and cost compared with
Height, is used for accelerating the cyclotron or superconducting cyclotron of various particles.(2) magnetic pole shimming method, mainly to magnetic
Pole edge shape carries out having a snack amendment, directly can be had a snack on magnetic pole, generally uses the panel to being assemblied in magnetic pole side
Had a snack；This method needed in practical operation repeatedly have a snack so that magnetic field meet accelerated particle slide phase requirement, mainly
It is applied in the compact cyclotron for accelerate single type particle.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of cyclotron isochronous magnetic field
Shimming method and system, it is contemplated that radial edges field-effect during having a snack, magnetic knot is surveyed in combination with FEM calculation with actual
Really, with predictable, high accuracy feature.Thus solve to be had a snack for compact cyclotron isochronous magnetic field in the prior art
The technical problem of method existing defects in the degree of accuracy.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of cyclotron isochronous magnetic field pad
Compensating method, including：
(1) treating the cyclotron main magnet having a snack carries out finite element modeling, calculates N group average magnetic fields difference point
Cloth curve, wherein, the N groups average magnetic field difference distribution curve represents the N number of different radii of pole edge in cyclotron
After place's cutting unit area, difference distribution of the average magnetic field relative to raw magnetic gradient at relevant radii before cutting at each radius
Curve；
(2) by the N groups average magnetic field difference distribution curve discretization, sign cut vector C is calculated with each after cutting
Average magnetic field changes the correlation matrix R of Δ B relations at radius；
(3) survey magnetic is carried out to the main magnet after reality processing, is calculated along the isochronous magnetic field of radius for magnetic data is surveyed
Deviation delta BisoIf, deviation delta BisoThe requirement of beam focusing operating point is not met, then using Δ BisoIt is reverse with correlation matrix R
Calculate pole edge cut vector Cpred；
(4) using the magnetic field knots modification predictive ability adjustment C of correlation matrix RpredSo that the magnetic field after having a snack meets line
Focusing task point requirement, it is determined that having a snack cut vector Cf；
(5) to having a snack cut vector CfSpline interpolation is carried out, the coordinate input Digit Control Machine Tool of discretization is carried out into magnetic pole side
Edge is had a snack.
Preferably, the radial direction spacing between the adjacent radius of N number of unit area cutting is more than or equal to 1cm.
Preferably, rear magnetic field knots modification Δ B is had a snack in the processing predicted according to step (4)pred=RCf。
It is another aspect of this invention to provide that a kind of cyclotron isochronous magnetic field shim system is provided, including：
Finite element modeling module, finite element modeling is carried out for treating the cyclotron main magnet having a snack, and calculates N
Group average magnetic field difference distribution curve, wherein, the N groups average magnetic field difference distribution curve represents the magnetic pole in cyclotron
After cutting unit area at the N number of different radii in edge, the average magnetic field at each radius is former relative at relevant radii before cutting
Beginning magnetic field difference distribution curve；
First computing module, for by the N groups average magnetic field difference distribution curve discretization, calculate characterize cutting to
Amount C changes the correlation matrix R of Δ B relations with average magnetic field at each radius after cutting；
Second computing module, for carrying out survey magnetic to the main magnet after reality processing, calculates along half for magnetic data is surveyed
The isochronous magnetic field deviation delta B in footpathisoIf, deviation delta BisoThe requirement of beam focusing operating point is not met, then using Δ BisoWith
Correlation matrix R inversely calculates pole edge cut vector Cpred；
3rd computing module, for the magnetic field knots modification predictive ability adjustment C using correlation matrix RpredSo that after having a snack
Magnetic field meet beam focusing operating point requirement, it is determined that having a snack cut vector Cf；
Module is had a snack, for having a snack cut vector CfSpline interpolation is carried out, the coordinate of discretization is input into Digit Control Machine Tool
Pole edge is carried out to have a snack.
Preferably, the radial direction spacing between the adjacent radius of N number of unit area cutting is more than or equal to 1cm.
Preferably, rear magnetic field knots modification Δ B is had a snack in the processing predicted according to the 3rd computing modulepred=RCf。
In general, there is following skill compared with prior art, mainly by the contemplated above technical scheme of the present invention
Art advantage：Traditional magnetic pole shimming method only considers to have a snack local magnetic field influence at radius, more using hard-edge model approximate simulation
Effect is had a snack, accuracy is had a snack inadequate；Instant invention overcomes the defect of traditional magnetic pole shimming method, by three-dimensional finite element point
Analysis, draws the distribution of average magnetic field knots modification after the cutting of unit area at different radii along radius, and from which further follow that sign is cut
Cut correlation matrix of the vector with global magnetic field knots modification.Can accurately be calculated using correlation matrix needs the edge shape having a snack simultaneously
Predict that it has a snack effect.Iteration can be completed in 1-2 times by shimming method proposed by the present invention and have a snack process.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of cyclotron isochronous magnetic field shimming method disclosed in the embodiment of the present invention；
Fig. 2 be the embodiment of the present invention in be used to calculate the unit cutting Model schematic diagram of correlation matrix；
Fig. 3 is to cut average magnetic field difference distribution after unit area at the different radii that calculates in the embodiment of the present invention
Figure.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
As shown in Figure 1 for a kind of flow of cyclotron isochronous magnetic field shimming method disclosed in the embodiment of the present invention is shown
It is intended to, is comprised the following steps in the method shown in Fig. 1：
(1) treating the cyclotron main magnet having a snack carries out finite element modeling, calculates N group average magnetic fields difference point
Cloth curve, wherein, above-mentioned N groups average magnetic field difference distribution curve represents the N number of different radii of pole edge in cyclotron
After place's cutting unit area, difference distribution of the average magnetic field relative to raw magnetic gradient at relevant radii before cutting at each radius
Curve；
(2) by above-mentioned N groups average magnetic field difference distribution curve discretization, sign cut vector C is calculated with each after cutting
Average magnetic field changes the correlation matrix R of Δ B relations at radius；
(3) survey magnetic is carried out to the main magnet after reality processing, is calculated along the isochronous magnetic field of radius for magnetic data is surveyed
Deviation delta BisoIf, deviation delta BisoThe requirement of beam focusing operating point is not met, then using Δ BisoIt is reverse with correlation matrix R
Calculate pole edge cut vector Cpred；
(4) using the magnetic field knots modification predictive ability adjustment C of correlation matrix RpredSo that the magnetic field after having a snack meets line
Focusing task point requirement, it is determined that having a snack cut vector Cf；
(5) to having a snack cut vector CfSpline interpolation is carried out, the coordinate input Digit Control Machine Tool of discretization is carried out into magnetic pole side
Edge is had a snack.
Used as a kind of optional implementation method, step (1) can use dimensional Finite Element software, such as OPERA-3D/
TOSCA or ANSYS software kits, initially set up the cyclotron main magnet three-dimensional finite element model for needing to have a snack, and calculate not
Carry out the average magnetic field at the archetype different radii of any cutting and be distributed B (R)；As shown in Fig. 2 in pole edge radius R1
To RNUnit area gore is cut at place respectively, wherein, the radial direction spacing between adjacent radius is more than or equal to 1cm, for every
Individual radius of clean-up Rk, corresponding average magnetic field distribution B at each radius can be calculated after cuttingk(R), and average magnetic field distribution phase
To the discrepancy delta B of raw magnetic gradient distribution B (R)k(R)=B (R)-Bk(R) N group average magnetic field difference distribution curves, are thus obtained, such as
Shown in Fig. 3, N group average magnetic field difference distributions curve covering characterizes magnetic field difference after cutting from center to the region drawn
Edge distribution.
As a kind of optional implementation method, in step (2), by N group average magnetic field difference distribution curve discretizations, by
The average magnetic field difference distribution data of N group discretizations calculate correlation matrix R.Due to every group of average magnetic field difference distribution curve bag
The distribution of radial edges after specific radius are cut is contained, correlation matrix R also characterizes cut vector C with each radius after cutting
Place's average magnetic field changes the relation of Δ B, that is, characterize influence of the cutting to radial direction fringe magnetic field at different radii, can accurately estimate and cut
Cut the change to global magnetic field.
As a kind of optional implementation method, in step (3), magnetic is carried out to the main magnet after being processed according to design
Survey, can be drawn after magnetic data is analyzed along discrepancy delta B when waiting of radius to surveying using beam dynamicsiso.Using correlation matrix R
With when waiting a discrepancy delta Biso, based on least square method, the pole edge cut vector C of prediction can be calculatedpred.Usual CpredAlso
Cannot be directly used to engineering to have a snack, it is necessary to C in step (4)predIt is adjusted, using the magnetic field knots modification of correlation matrix R
Predictive ability causes that the magnetic field after having a snack meets beam focusing operating point and requires, that is, meet line axially and radially frequency of oscillation
It is required that, it is determined that having a snack cut vector for Cf.In step (5), cut vector C is had a snack by what is determinedfIt is converted into using spline interpolation
The acceptable machining coordinate sequence of numerical control machining center, carries out having a snack amendment to pole edge or magnetic pole panel.
Wherein, rear magnetic field knots modification Δ B is had a snack in the processing being predicted by step (4)pred=RCf.Using correct
Modeling and FEM calculation, prediction magnetic field knots modification are less than 5Gs with actual measurement magnetic field knots modification deviation, can predict and have a snack effect,
Further increase and have a snack reliability.
Due to considering the influence having a snack to radial direction fringe magnetic field, can be carried out to arbitrarily having a snack vector using correlation matrix R
Accurately have a snack effect prediction so that the shimming method in the present invention have it is very high have a snack precision, generally pass through 1-2 iteration
Phase deviation is locally slided within being capable of achieving 0.05%, and accumulation within positive and negative 6 degree slides to deviation.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (6)
1. a kind of cyclotron isochronous magnetic field shimming method, it is characterised in that including：
(1) treating the cyclotron main magnet having a snack carries out finite element modeling, calculates N group average magnetic fields difference distribution bent
Line, wherein, the N groups average magnetic field difference distribution curve is represented to be cut at the N number of different radii of pole edge of cyclotron
After cutting unit area, the average magnetic field at each radius is bent relative to the difference distribution of raw magnetic gradient at relevant radii before cutting
Line；
(2) by the N groups average magnetic field difference distribution curve discretization, sign cut vector C is calculated with each radius after cutting
Place's average magnetic field changes the correlation matrix R of Δ B relations；
(3) survey magnetic is carried out to the main magnet after reality processing, is calculated along the isochronous magnetic field deviation of radius for magnetic data is surveyed
ΔBisoIf, deviation delta BisoThe requirement of beam focusing operating point is not met, then using Δ BisoInversely calculated with correlation matrix R
Go out pole edge cut vector Cpred；
(4) using the magnetic field knots modification predictive ability adjustment C of correlation matrix RpredSo that the magnetic field after having a snack meets beam focusing
Operating point requires, it is determined that having a snack cut vector Cf；
(5) to having a snack cut vector CfSpline interpolation is carried out, the coordinate input Digit Control Machine Tool of discretization is carried out into pole edge pad
Mend.
2. method according to claim 1, it is characterised in that the radial direction between the adjacent radius of N number of unit area cutting
Spacing is more than or equal to 1cm.
3. method according to claim 1 and 2, it is characterised in that the processing predicted according to step (4) is had a snack rear magnetic field and changed
Variable Δ Bpred=RCf。
4. a kind of cyclotron isochronous magnetic field shim system, it is characterised in that including：
Finite element modeling module, finite element modeling is carried out for treating the cyclotron main magnet having a snack, and is calculated N groups and is put down
Equal magnetic field difference distribution curve, wherein, the N groups average magnetic field difference distribution curve represents the pole edge in cyclotron
After cutting unit area at N number of different radii, the average magnetic field at each radius is relative to original magnetic at relevant radii before cutting
The difference distribution curve of field；
First computing module, cut vector C is characterized for by the N groups average magnetic field difference distribution curve discretization, calculating
Change the correlation matrix R of Δ B relations with average magnetic field at each radius after cutting；
Second computing module, for carrying out survey magnetic to the main magnet after reality processing, calculates along radius for magnetic data is surveyed
Isochronous magnetic field deviation delta BisoIf, deviation delta BisoThe requirement of beam focusing operating point is not met, then using Δ BisoAnd correlation
Matrix R inversely calculates pole edge cut vector Cpred；
3rd computing module, for the magnetic field knots modification predictive ability adjustment C using correlation matrix RpredSo that the magnetic after having a snack
Field meets the requirement of beam focusing operating point, it is determined that having a snack cut vector Cf；
Module is had a snack, for having a snack cut vector CfSpline interpolation is carried out, the coordinate input Digit Control Machine Tool of discretization is carried out into magnetic
Have a snack at pole edge.
5. system according to claim 4, it is characterised in that the radial direction between the adjacent radius of N number of unit area cutting
Spacing is more than or equal to 1cm.
6. the system according to claim 4 or 5, it is characterised in that after the processing predicted according to the 3rd computing module is had a snack
Magnetic field knots modification Δ Bpred=RCf。
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| CN107466152A (en) * | 2017-07-25 | 2017-12-12 | 中国科学院高能物理研究所 | Multipole magnet and its magnetic field harmonics shimming method |
| CN108780471A (en) * | 2018-06-07 | 2018-11-09 | 新瑞阳光粒子医疗装备(无锡)有限公司 | The antidote and device of magnetic field center error, equipment and storage medium |
| CN108834300A (en) * | 2018-06-27 | 2018-11-16 | 中国原子能科学研究院 | Extraction magnet passage first harmonic in superconducting cyclotron has a snack device and method |
| CN108882498A (en) * | 2018-07-04 | 2018-11-23 | 中国原子能科学研究院 | A kind of high-intensity magnetic field synchrocyclotron and its magnet field shim method |
| CN109548264A (en) * | 2018-10-31 | 2019-03-29 | 中国原子能科学研究院 | A kind of superconducting cyclotron isochronous magnetic field shimming method |
| CN110740561A (en) * | 2018-07-21 | 2020-01-31 | 中国原子能科学研究院 | Edge field shimming method for leading out magnetic channel element in superconducting cyclotron |
| CN112135411A (en) * | 2020-09-18 | 2020-12-25 | 中国原子能科学研究院 | Beam flow sliding phase measurement method in superconducting cyclotron |
| CN112216468A (en) * | 2020-10-29 | 2021-01-12 | 中国原子能科学研究院 | Straight-side fan main magnet of compact type medium-energy negative hydrogen strong-flow isochronous cyclotron |
| CN114217251A (en) * | 2021-12-08 | 2022-03-22 | 华中科技大学 | Magnetic conductivity measurement method and device |
| CN115568084A (en) * | 2022-11-22 | 2023-01-03 | 中国科学院近代物理研究所 | Online magnetic field dynamic effect compensation system, method and readable medium |
| CN116116217A (en) * | 2022-12-13 | 2023-05-16 | 北京核力同创科技有限公司 | Magnetic field shimming method and system of isotope electromagnetic separator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107466152B (en) * | 2017-07-25 | 2019-09-20 | 中国科学院高能物理研究所 | Multipole magnet and its magnetic field harmonics shimming method |
| CN107466152A (en) * | 2017-07-25 | 2017-12-12 | 中国科学院高能物理研究所 | Multipole magnet and its magnetic field harmonics shimming method |
| CN108780471B (en) * | 2018-06-07 | 2022-09-20 | 新瑞阳光粒子医疗装备(无锡)有限公司 | Method and device for correcting magnetic field center error, equipment and storage medium |
| CN108780471A (en) * | 2018-06-07 | 2018-11-09 | 新瑞阳光粒子医疗装备(无锡)有限公司 | The antidote and device of magnetic field center error, equipment and storage medium |
| CN108834300A (en) * | 2018-06-27 | 2018-11-16 | 中国原子能科学研究院 | Extraction magnet passage first harmonic in superconducting cyclotron has a snack device and method |
| CN108834300B (en) * | 2018-06-27 | 2019-09-13 | 中国原子能科学研究院 | Extraction magnet passage first harmonic in superconducting cyclotron has a snack device and method |
| CN108882498A (en) * | 2018-07-04 | 2018-11-23 | 中国原子能科学研究院 | A kind of high-intensity magnetic field synchrocyclotron and its magnet field shim method |
| CN110740561A (en) * | 2018-07-21 | 2020-01-31 | 中国原子能科学研究院 | Edge field shimming method for leading out magnetic channel element in superconducting cyclotron |
| CN109548264A (en) * | 2018-10-31 | 2019-03-29 | 中国原子能科学研究院 | A kind of superconducting cyclotron isochronous magnetic field shimming method |
| CN112135411A (en) * | 2020-09-18 | 2020-12-25 | 中国原子能科学研究院 | Beam flow sliding phase measurement method in superconducting cyclotron |
| CN112216468A (en) * | 2020-10-29 | 2021-01-12 | 中国原子能科学研究院 | Straight-side fan main magnet of compact type medium-energy negative hydrogen strong-flow isochronous cyclotron |
| CN112216468B (en) * | 2020-10-29 | 2022-11-25 | 中国原子能科学研究院 | Straight-side fan main magnet of compact type medium-energy negative hydrogen strong-flow isochronous cyclotron |
| CN114217251A (en) * | 2021-12-08 | 2022-03-22 | 华中科技大学 | Magnetic conductivity measurement method and device |
| CN115568084A (en) * | 2022-11-22 | 2023-01-03 | 中国科学院近代物理研究所 | Online magnetic field dynamic effect compensation system, method and readable medium |
| CN115568084B (en) * | 2022-11-22 | 2023-03-10 | 中国科学院近代物理研究所 | Online magnetic field dynamic effect compensation system, method and readable medium |
| CN116116217A (en) * | 2022-12-13 | 2023-05-16 | 北京核力同创科技有限公司 | Magnetic field shimming method and system of isotope electromagnetic separator |
| CN116116217B (en) * | 2022-12-13 | 2024-01-19 | 北京核力同创科技有限公司 | Magnetic field shimming method and system of isotope electromagnetic separator |
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