CN106132065B - 230MeV superconducting cyclotron avoids the field structure of draw-out area harmful resonance - Google Patents
230MeV superconducting cyclotron avoids the field structure of draw-out area harmful resonance Download PDFInfo
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- CN106132065B CN106132065B CN201610617091.2A CN201610617091A CN106132065B CN 106132065 B CN106132065 B CN 106132065B CN 201610617091 A CN201610617091 A CN 201610617091A CN 106132065 B CN106132065 B CN 106132065B
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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 present invention relates to the field structures that a kind of 230MeV superconducting cyclotron avoids draw-out area harmful resonance, the notch that rounding off is opened up at magnetic pole protrusion side profile is coupled using the permeability magnetic material cushion block with magnetic pole same material in the magnetic pole protrusion side gap position opened up；The inner surface of the permeability magnetic material cushion block and the protrusion side notch tight fit of magnetic pole；Profile rounding off before and after the protrusion side notch of the front and back end of the outer surface profile of permeability magnetic material cushion block and magnetic pole, and formed avoid draw-out area harmful resonance needed for reflexed angle.The present invention reduces axial resonance frequency v before leading point under conditions of not increasing magnetic pole radiusz, avoid passing through v before leading pointz=1 resonance prevents the educt beaming flow axial direction quality variation as caused by the resonance, reduces the beam loss of draw-out area, and then reduce irradiation dose suffered by accelerator maintenance personnel.
Description
Technical field
The invention belongs to cyclotron designing techniques, and in particular to a kind of 230MeV superconducting cyclotron avoids drawing
The field structure of area's harmful resonance.
Background technique
According to the isochronism principle of cyclotron, have
In formula, BcenterIt is central magnetic field, c is the light velocity, ω0For particle cyclotron frequency, r is radius of gyration.To fixed-field with
Cyclotron frequency Bcenter、ω0, field whens theory etc. can be provided by formula (1).According to formula (1), cyclotron isochronism magnetic
Field is with increasing radii.
The free oscillation frequency approximate expression of isochronous cyclotron is：
Modulation degree F is determined by following formula in formula：
Wherein,<B>=α Bhill+(1-α)·Bvalley (5)
α is ratio shared by magnetic pole, Bhill、BvalleyThe respectively magnetic field in central plane superiors area and paddy area, it is general next
It says, Bhill> Bvalley.<B>For the average magnetic field at radius r.In order to avoidBeam loss caused by resonating, for drawing
The medium-energy cyclotron of 230MeV proton out, number of blade N >=4 of magnetic pole, therefore (3) formula is approximately (6) formula：
In formula
Known by (7) formula, when cyclotron average magnetic field is not further added byI.e.It is attached
Close magnetic rigidity is maximum, is brought into (6) formula and obtains νrMagnetic rigidity is maximum near=1, i.e. νrThe magnetic rigidity body of=1 near-resonance
The size of cyclotron maximum acceleration energy is showed, usual isochronous cyclotron selection is in νrIt is drawn after=1 radius,
To make full use of magnetic field pulse guide field.At this moment, since cyclotron average magnetic field after increasing radii to peak value with beginning to decline, draw
The magnetic field put out has been in the region that average magnetic field declines with radius.By (7) formula it is found that the neighbouring n > 0, Er Qiesui in leading point
Average magnetic field decrease speed become faster, n becomes larger rapidly.By (2) formula it is found that being possible to pass through ν before leading pointz=1 resonance.
ν is passed through before leading pointz=1 resonance will cause axial bundle stream quality variation.
In order to reduce axial resonance frequency v before leading pointz, according to (2) formula, need to reduce the field in the preceding zonule in leading point
Land index n；Or reduce modulation degree F in the preceding zonule in leading point；Or reduce the preceding zonule inner-spiral angle ξ in leading point.But
Reducing field landing index n means to increase magnetic pole radius, will lead to extraction system difficult design, extraction voltage is excessively high；Part is small
Modulation degree F variation is slowly unable to satisfy the requirement locally to become smaller very much in region；Reduce the preceding zonule inner-spiral angle ξ in leading point,
It will lead to magnetic pole protrusion side profile and occur reflexed angle sharply near draw-out area, directly processing, which is difficult to ensure, processes draw-out area
Required magnetic pole contour line.
Summary of the invention
It is an object of the invention to aiming at the problems existing in the prior art, provide a kind of 230MeV superconducting cyclotron
The field structure for avoiding draw-out area harmful resonance, under conditions of not increasing magnetic pole radius (not influencing extraction system design), drop
Axial resonance frequency v before low leading pointz, avoid passing through v before leading pointz=1 resonance.
Technical scheme is as follows：A kind of 230MeV superconducting cyclotron avoids the magnetic pole of draw-out area harmful resonance
Structure opens up the notch of rounding off, using the permeability magnetic material cushion block with magnetic pole same material in institute at magnetic pole protrusion side profile
The magnetic pole protrusion side gap position opened up is coupled；The inner surface of the permeability magnetic material cushion block and the protrusion side notch of magnetic pole are tight
Cooperation；Profile rounding off before and after the front and back end of the outer surface profile of permeability magnetic material cushion block and the protrusion side notch of magnetic pole, and
Reflexed angle needed for formation avoids draw-out area harmful resonance.
Further, 230MeV superconducting cyclotron as described above avoids the field structure of draw-out area harmful resonance,
In, for single magnetic pole, the permeability magnetic material cushion block is an integral single piece, or is divided into sliceable multiple accessories
Combination.
Further, 230MeV superconducting cyclotron as described above avoids the field structure of draw-out area harmful resonance,
In, the permeability magnetic material cushion block is fixedly connected by bolt with the protrusion side notch of magnetic pole.
Further, 230MeV superconducting cyclotron as described above avoids the field structure of draw-out area harmful resonance,
In, for possessing the cyclotron of multiple magnetic poles, the notch of rounding off is opened up at the protrusion side profile of each magnetic pole,
The shape and size of the permeability magnetic material cushion block of notch setting are identical.
Further, 230MeV superconducting cyclotron as described above avoids the field structure of draw-out area harmful resonance,
In, the magnetic field of draw-out area is fine-tuned by processing the appearance chamfered shape of the permeability magnetic material cushion block.
Beneficial effects of the present invention are as follows：Using the solution of the present invention, when the magnetic-field measurement of cyclotron is with having a snack,
It can be avoided by machining the outer surface profile of permeability magnetic material cushion block come the magnetic field of local fine adjusting draw-out area to entire magnetic
The difficulty of pole processing improves line in the resonance of draw-out area.The present invention (does not influence extraction system to set not increasing magnetic pole radius
Meter) under conditions of, reduce axial resonance frequency v before leading pointz, avoid passing through v before leading pointz=1 resonance, prevents by this
Educt beaming flow axial direction quality variation caused by resonance reduces the beam loss of draw-out area, and then reduces accelerator maintenance personnel institute
The irradiation dose received.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of 230MeV superconducting cyclotron；
Fig. 2 is the field structure schematic diagram that 230MeV superconducting cyclotron avoids draw-out area harmful resonance；
Fig. 3 is the result schematic diagram that magnetic field and Particle tracking calculate after having a snack magnetic pole using structure of the invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
The structure of 230MeV superconducting cyclotron is as shown in Figure 1,5 be magnetic pole in figure, twist, this is this field
Well-known technique.As shown in Fig. 2, the present invention solves the problems, such as that line is drawing Q region resonance Q in such a way that magnetic pole is had a snack, provided
230MeV superconducting cyclotron avoid the field structure of draw-out area harmful resonance as follows：It protrudes in magnetic pole 1 and is opened at side profile
If rounding off and the notch 3 being easily worked, magnetic pole is had a snack using the permeability magnetic material cushion block 2 with the same material of magnetic pole 1,
Permeability magnetic material cushion block 2 and the protrusion side notch 3 of magnetic pole 1 are coupled by bolt 4.The inner surface of permeability magnetic material cushion block 2 with
The protrusion side notch 3 of magnetic pole 1 is fitted close；The front and back end of the outer surface profile of permeability magnetic material cushion block 2 and the protrusion side of magnetic pole 1 lack
The profile rounding off of mouthfuls 3 front and backs, and formed avoid draw-out area harmful resonance needed for reflexed angle.Permeability magnetic material cushion block 2 can be with
It is designed as meeting the arbitrary shape of above-mentioned requirements, it can be by machining the outer surface profile of permeability magnetic material cushion block come local fine
Adjust the magnetic field of draw-out area.
For single magnetic pole 1, permeability magnetic material cushion block 2 can be integral single piece；Sliceable multiple match can also be divided into
The combination of part, multiple accessory splicings are fitted to the protrusion side notch 3 of magnetic pole 1, and the cushion block after combination should integrally meet above-mentioned
With the protrusion side notch tight fit of magnetic pole and the structural requirement of rounding off.
Generally, for the cyclotron for possessing multiple magnetic poles, opened up at the protrusion side profile of each magnetic pole
The shape and size of rounding off and the notch being easily worked, the permeability magnetic material cushion block 2 of all magnetic poles should be consistent.
Embodiment
By taking energy superconducting cyclotron in certain as an example.There are four magnetic pole blade, magnetic pole radius R=860mm for the accelerator.Root
It is calculated according to magnetic field, in order to avoid passing through v before leading pointzThere is reflexed angle since magnetic pole radius r=810mm in=1 resonance.
Since magnetic pole radius r=770mm, the profile that magnetic pole protrudes side designs machining gap, increases permeability magnetic material cushion block.Magnetic pole lacks
The inner surface profile of profile and permeability magnetic material cushion block engaged therewith is circular arc at mouthful, and arc radius R is 70mm, is greater than processing
Tool radius needed for magnetic pole (42mm), it is easy to process；The reflexed angle θ of the outer surface profile of permeability magnetic material cushion block is 110 degree, warp
It crosses magnetic field and Particle tracking to calculate, be shown by Fig. 3 calculated result using such magnetic pole indentation, there profile and engaged therewith
Permeability magnetic material cushion block size can make v before draw-out area outzV1 avoids vz=1 harmful resonance.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then the present invention is also intended to include these modifications and variations.
Claims (5)
1. the field structure that a kind of 230MeV superconducting cyclotron avoids draw-out area harmful resonance, it is characterised in that：In magnetic pole
The notch (3) that rounding off is opened up at protrusion side profile, using the permeability magnetic material cushion block (2) with magnetic pole same material what is opened up
Magnetic pole protrusion side notch (3) position is coupled；The inner surface of the permeability magnetic material cushion block (2) and the protrusion side notch of magnetic pole
(3) tight fit；Profile before and after the front and back end of the outer surface profile of permeability magnetic material cushion block (2) and the protrusion side notch (3) of magnetic pole
Rounding off, and formed avoid draw-out area harmful resonance needed for reflexed angle.
2. 230MeV superconducting cyclotron as described in claim 1 avoids the field structure of draw-out area harmful resonance, special
Sign is：For single magnetic pole, the permeability magnetic material cushion block (2) is an integral single piece, or is divided into sliceable
The combination of multiple accessories.
3. 230MeV superconducting cyclotron as claimed in claim 1 or 2 avoids the field structure of draw-out area harmful resonance,
It is characterized in that：The permeability magnetic material cushion block (2) is fixedly connected by bolt (4) with the protrusion side notch (3) of magnetic pole.
4. 230MeV superconducting cyclotron as claimed in claim 1 or 2 avoids the field structure of draw-out area harmful resonance,
It is characterized in that：For possessing the cyclotron of multiple magnetic poles, rounding off is opened up at the protrusion side profile of each magnetic pole
Notch, notch setting permeability magnetic material cushion block shape and size it is identical.
5. 230MeV superconducting cyclotron as claimed in claim 1 or 2 avoids the field structure of draw-out area harmful resonance,
It is characterized in that：The magnetic field of draw-out area is fine-tuned by processing the appearance chamfered shape of the permeability magnetic material cushion block.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610617091.2A CN106132065B (en) | 2016-07-29 | 2016-07-29 | 230MeV superconducting cyclotron avoids the field structure of draw-out area harmful resonance |
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| CN201610617091.2A CN106132065B (en) | 2016-07-29 | 2016-07-29 | 230MeV superconducting cyclotron avoids the field structure of draw-out area harmful resonance |
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| CN106132065A CN106132065A (en) | 2016-11-16 |
| CN106132065B true CN106132065B (en) | 2018-11-30 |
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| CN109548264B (en) * | 2018-10-31 | 2019-12-24 | 中国原子能科学研究院 | Isochronous magnetic field shimming method for superconducting cyclotron |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3925676A (en) * | 1974-07-31 | 1975-12-09 | Ca Atomic Energy Ltd | Superconducting cyclotron neutron source for therapy |
| CN1209037A (en) * | 1997-08-14 | 1999-02-24 | 深圳奥沃国际科技发展有限公司 | Longspan cyclotron |
| EP1069809A1 (en) * | 1999-07-13 | 2001-01-17 | Ion Beam Applications S.A. | Isochronous cyclotron and method of extraction of charged particles from such cyclotron |
| EP3024306B1 (en) * | 2014-11-19 | 2019-08-07 | Ion Beam Applications S.A. | High current cyclotron |
| CN205883693U (en) * | 2016-07-29 | 2017-01-11 | 中国原子能科学研究院 | 230MeV superconducting cyclotron avoids drawing forth harmful resonant field structure in district |
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