CN206061269U - 230MeV superconducting cyclotrons prevent the frame for movement of draw-out area harmful resonance - Google Patents
230MeV superconducting cyclotrons prevent the frame for movement of draw-out area harmful resonance Download PDFInfo
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- CN206061269U CN206061269U CN201621059741.8U CN201621059741U CN206061269U CN 206061269 U CN206061269 U CN 206061269U CN 201621059741 U CN201621059741 U CN 201621059741U CN 206061269 U CN206061269 U CN 206061269U
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Abstract
This utility model is related to a kind of 230MeV superconducting cyclotrons prevents the frame for movement of draw-out area harmful resonance, the magnetic pole of the structure is in double-decker, lower floor is magnetic pole root, upper strata is to have a snack plate with the permeability magnetic material of magnetic pole root same material, described permeability magnetic material has a snack the surface that plate is fixed on lower floor's magnetic pole root, and upper strata permeability magnetic material has a snack the protrusion side profile of plate compared with the protrusion side profile of lower floor's magnetic pole root with bigger opisthotonos angle.This utility model reduces axial resonance frequency ν before leading point under conditions of magnetic pole radius is not increasedz, it is to avoid ν is passed through before leading pointz=1 resonance, prevents the educt beaming flow axial direction quality variation caused by the resonance, reduces the beam loss of draw-out area, and then reduce the irradiation dose suffered by accelerator attendant.
Description
Technical field
This utility model belongs to cyclotron designing technique, and in particular to a kind of 230MeV superconducting cyclotrons are prevented
The frame for movement of draw-out area harmful resonance.
Background technology
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.Given magnetic field with
Cyclotron frequency Bcenter、ω0, field when can provide theory etc. 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：
In formula, modulation degree F is determined by following formula：
Wherein,<B>=α Bhill+(1-α)·Bvalley (5)
Ratios of the α shared by magnetic pole, Bhill、BvalleyRespectively central plane superiors area and the magnetic field in paddy area, typically come
Say, Bhill>Bvalley.<B>For the average magnetic field at radius r.In order to avoidBeam loss caused by resonance, for drawing
Go out the medium-energy cyclotron of 230MeV protons, 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.Near
Magnetic rigidity it is maximum, obtain ν in being brought into (6) formularNear=1, magnetic rigidity is maximum, i.e. νrThe magnetic rigidity of=1 near-resonance embodies
The size of cyclotron maximum acceleration energy, usual isochronous cyclotron are selected in νrDraw after=1 radius, with
Just make full use of magnetic field pulse guide field.At this moment, as cyclotron average magnetic field is with beginning to decline after increasing radii to peak value, draw
The region that the magnetic field of point declines with radius already in average magnetic field.From n near (7) formula, leading point>0, and with flat
Magnetic field decrease speed accelerates, and n becomes rapidly big.From (2) formula, it is possible to pass through ν before leading pointz=1 resonance.Drawing
ν is passed through before going out a littlez=1 resonance can cause axial bundle stream quality variation.
In order to reduce axial resonance frequency ν before leading pointz, according to (2) formula, need to reduce the field in the front zonule in leading point
Landing index n；Or reduce modulation degree F in the front zonule in leading point；Or reduce the front zonule inner-spiral angle ξ in leading point.But
Reducing field landing index n means to increase magnetic pole radius, can cause extraction system difficult design, and extraction voltage is too high；It is locally little
Modulation degree F changes in region cannot slowly meet the requirement that local diminishes.Reduce the front zonule inner-spiral angle ξ in leading point to exist
Have difficulties in structure.
Utility model content
The purpose of this utility model is for problems of the prior art, there is provided a kind of 230MeV superconducting cyclotrons add
Fast device prevents the frame for movement of draw-out area harmful resonance, in the condition for not increasing magnetic pole radius (not affecting extraction system to design)
Under, reduce axial resonance frequency ν before leading pointz, it is to avoid ν is passed through before leading pointz=1 resonance.
The technical solution of the utility model is as follows：A kind of 230MeV superconducting cyclotrons prevent draw-out area harmful resonance
Frame for movement, the magnetic pole are in double-decker, and lower floor is magnetic pole root, and upper strata is the permeability magnetic material pad with magnetic pole root same material
Plate is mended, described permeability magnetic material has a snack the surface that plate is fixed on lower floor's magnetic pole root, and upper strata permeability magnetic material has a snack the protrusion side of plate
Profile is compared with the protrusion side profile of lower floor's magnetic pole root with bigger opisthotonos angle.
Further, 230MeV superconducting cyclotrons as above prevent the frame for movement of draw-out area harmful resonance, its
In, described permeability magnetic material has a snack the height of the thickness less than the magnetic pole root of plate.
Further, 230MeV superconducting cyclotrons as above prevent the frame for movement of draw-out area harmful resonance, its
In, described permeability magnetic material has a snack the surface that plate is bolted on lower floor's magnetic pole root.
Further, 230MeV superconducting cyclotrons as above prevent the frame for movement of draw-out area harmful resonance, its
In, for the cyclotron for possessing multiple magnetic poles, the permeability magnetic material arranged on each magnetic pole root have a snack plate shape and
It is equivalently-sized.
Further, 230MeV superconducting cyclotrons as above prevent the frame for movement of draw-out area harmful resonance, its
In, the outer surface profile that plate is had a snack by processing the permeability magnetic material adjusts the magnetic field of draw-out area come local fine, improves line
In the resonance of draw-out area.
The beneficial effects of the utility model are as follows：Using scheme of the present utility model, in the magnetic-field measurement of cyclotron
During with having a snack, the side profile that plate can be had a snack by machining permeability magnetic material adjusts the magnetic field of draw-out area come local fine, changes
Resonance of the kind line in draw-out area.This utility model under conditions of magnetic pole radius (not affecting extraction system to design) is not increased,
Reduce axial resonance frequency ν before leading pointz, it is to avoid ν is passed through before leading pointz=1 resonance, prevented by drawing that the resonance is caused
Go out line axial direction quality variation, reduce the beam loss of draw-out area, and then reduce the irradiation dose suffered by accelerator attendant.
Description of the drawings
Structural representations of the Fig. 1 for 230MeV superconducting cyclotrons；
Fig. 2 is the field structure side view that 230MeV superconducting cyclotrons prevent draw-out area harmful resonance；
Fig. 3 is the field structure top view that 230MeV superconducting cyclotrons prevent draw-out area harmful resonance；
Fig. 4 is to have a snack the result schematic diagram that magnetic field and Particle tracking are calculated after magnetic pole using structure of the present utility model.
Specific embodiment
With reference to the accompanying drawings and examples this utility model is described in detail.
The structure of 230MeV superconducting cyclotrons is as shown in figure 1,1 be magnetic pole in figure, twist, this is this area
Known technology.230MeV superconducting cyclotrons provided by the utility model prevent the field structure of draw-out area harmful resonance,
Into double-decker, as shown in Fig. 2 lower floor is magnetic pole root 2 (i.e. the main body of magnetic pole), upper strata is and magnetic pole root the pole design
The permeability magnetic material of 2 same material of portion has a snack plate 3, and described permeability magnetic material is had a snack plate 3 and is bolted on lower floor magnetic pole root 2
The height H2 that the thickness H1 of plate 2 is far smaller than magnetic pole root 3 is had a snack on surface, permeability magnetic material.
The protrusion side profile of lower floor's magnetic pole root is easily worked in draw-out area rounding off.As permeability magnetic material has a snack plate 2
Thickness H1 be far smaller than magnetic pole root 3 height H2, be more convenient processing, therefore, upper strata permeability magnetic material has a snack the protrusion side of plate
Profile can process bigger opisthotonos angle compared with the protrusion side profile of lower floor's magnetic pole root, for avoiding the harmful of draw-out area
Resonance, as shown in figure 3,4 be profile that lower floor magnetic pole root protrudes side in figure, in figure, 5 is that upper strata permeability magnetic material is had a snack plate and protruded
The profile of side.Individually processed by plate being had a snack to upper strata permeability magnetic material, at protrusion side profile formed bigger opisthotonos angle,
Then upper strata permeability magnetic material is had a snack surface engagement of the plate by bolt with lower floor's magnetic pole root to install, so avoids to whole
The difficulty that individual magnetic pole is processed.And the magnetic-field measurement of cyclotron with having a snack when, can by machine permeability magnetic material
The outer surface profile for having a snack plate 2 comes the magnetic field that local fine adjusts draw-out area, improves resonance of the line in draw-out area.
For the cyclotron for possessing multiple magnetic poles, the permeability magnetic material arranged on each magnetic pole root has a snack the shape of plate
Shape and equivalently-sized.Can by process the permeability magnetic material have a snack plate protrusion side profile opisthotonos angle size adjusting extraction
The magnetic field in area.
Embodiment
By taking energy superconducting cyclotron in certain as an example.The accelerator has four magnetic pole blades, magnetic pole radius R=860mm.Root
According to magnetic field calculation, in order to avoid passing through ν before leading pointz=1 resonance, starts opisthotonos angle occur from magnetic pole radius r=810mm.
From the beginning of magnetic pole radius r=770mm, the profile rounding off of magnetic pole protrusion side is easy to processing to lower floor's magnetic pole root, and upper strata is led
Magnetic material is had a snack plate (thickness H1=50mm) and starts to process big opisthotonos angle from magnetic pole radius r=770mm, about 110 degree of opisthotonos angle,
For adjusting draw-out area magnetic field, it is to avoid harmful resonance.Fig. 4 result of calculations show, have a snack board size using such permeability magnetic material,
Before draw-out area is gone out, ν can be causedz<1, it is to avoid νz=1 harmful resonance.
Obviously, those skilled in the art can carry out various changes and modification without deviating from this practicality to this utility model
New spirit and scope.So, if belonging to this utility model claim to these modifications of the present utility model and modification
And its within the scope of equivalent technology, then this utility model is also intended to comprising these changes and modification.
Claims (5)
1. a kind of 230MeV superconducting cyclotrons prevent the frame for movement of draw-out area harmful resonance, it is characterised in that：Magnetic pole is in
Double-decker, lower floor are magnetic pole root, and upper strata is to have a snack plate, described permeability magnetic material with the permeability magnetic material of magnetic pole root same material
The surface that plate is fixed on lower floor's magnetic pole root is had a snack, upper strata permeability magnetic material has a snack the protrusion side profile and lower floor's magnetic pole root of plate
Protrusion side profile is compared with bigger opisthotonos angle.
2. 230MeV superconducting cyclotrons as claimed in claim 1 prevent the frame for movement of draw-out area harmful resonance, and which is special
Levy and be：Described permeability magnetic material has a snack the height of the thickness less than the magnetic pole root of plate.
3. 230MeV superconducting cyclotrons as claimed in claim 1 or 2 prevent the frame for movement of draw-out area harmful resonance, its
It is characterised by：Described permeability magnetic material has a snack the surface that plate is bolted on lower floor's magnetic pole root.
4. 230MeV superconducting cyclotrons as claimed in claim 1 or 2 prevent the frame for movement of draw-out area harmful resonance, its
It is characterised by：For the cyclotron for possessing multiple magnetic poles, the permeability magnetic material arranged on each magnetic pole root has a snack plate
Shape and size are identical.
5. 230MeV superconducting cyclotrons as claimed in claim 1 or 2 prevent the frame for movement of draw-out area harmful resonance, its
It is characterised by：The outer surface profile that plate is had a snack by processing the permeability magnetic material adjusts the magnetic field of draw-out area come local fine, changes
Resonance of the kind line in draw-out area.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620818256 | 2016-07-29 | ||
| CN2016208182568 | 2016-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206061269U true CN206061269U (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621059741.8U Withdrawn - After Issue CN206061269U (en) | 2016-07-29 | 2016-09-18 | 230MeV superconducting cyclotrons prevent the frame for movement of draw-out area harmful resonance |
Country Status (1)
| Country | Link |
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| CN (1) | CN206061269U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211540A (en) * | 2016-07-29 | 2016-12-07 | 中国原子能科学研究院 | 230MeV superconducting cyclotron prevents the frame for movement of draw-out area harmful resonance |
| 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 |
| EP3876679A1 (en) * | 2020-03-06 | 2021-09-08 | Ion Beam Applications | Synchrocyclotron for extracting beams of various energies |
-
2016
- 2016-09-18 CN CN201621059741.8U patent/CN206061269U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211540A (en) * | 2016-07-29 | 2016-12-07 | 中国原子能科学研究院 | 230MeV superconducting cyclotron prevents the frame for movement of draw-out area harmful resonance |
| 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 |
| 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 |
| EP3876679A1 (en) * | 2020-03-06 | 2021-09-08 | Ion Beam Applications | Synchrocyclotron for extracting beams of various energies |
| US11160159B2 (en) | 2020-03-06 | 2021-10-26 | Ion Beam Applications S.A. | Synchrocyclotron for extracting beams of various energies |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170329 Effective date of abandoning: 20181009 |