CN103517537B - Two stripping film individual pen line outbound courses in compact cyclotron - Google Patents
Two stripping film individual pen line outbound courses in compact cyclotron Download PDFInfo
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- CN103517537B CN103517537B CN201210204706.0A CN201210204706A CN103517537B CN 103517537 B CN103517537 B CN 103517537B CN 201210204706 A CN201210204706 A CN 201210204706A CN 103517537 B CN103517537 B CN 103517537B
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Abstract
The present invention relates to the line lead-out process of cyclotron, be specifically related to the two stripping film individual pen line outbound courses in a kind of compact cyclotron.The method adopts places a slice stripping film respectively to carry out the individual pen extraction of line on the azimuth that accelerator is relative.On the one hand, stripping film replaces traditional electrostatic deflection plates, not only make use of stripping film ejection efficiency high, draw advantage easily, peel off the construction of target system and install also more simple, operating cost is also reduced; On the other hand, the present invention takes full advantage of the precession of line, reduces the requirement of accelerator being injected to quality of beam.
Description
Technical field
The present invention relates to the line lead-out process of cyclotron, be specifically related to the two stripping film individual pen line outbound courses in a kind of compact cyclotron.
Background technology
Peeling off the general principle of drawing is place one piece of stripping film, H at accelerator line extraction location
-line hits and on film, is stripped two electronics becomes H
+, the radius of curvature of Particles Moving in opposite direction thus drawn.This lead-out mode ejection efficiency high (>99%), and very convenient, therefore, current most H
-compact cyclotron all adopts this kind of mode to draw proton beam.But peeling off extraction is a kind of multi-turn line lead-out mode, the emittance of educt beaming flow and line often can fall apart comparatively greatly, are mostly applied to medical radionuclide production etc. to the less demanding field of quality of beam.Individual pen lead-out mode can make up the low shortcoming of multi-turn educt beaming flow quality, all adopts electrostatic deflection plates to draw individual pen line at present in the world.But the installation of electrostatic deflection plates and build equal more complicated, beam loss in spill process is comparatively large, and the stability of accelerator operation can be affected, simultaneously, this lead-out mode requires that the line envelope of extraction location is less than the size of turn separation, higher to the requirement of injecting quality of beam.Therefore, be necessary to study a kind of technology adopting stripping film to realize the extraction of individual pen line, ensure that beam extraction efficiency is high, realize easily simultaneously, draw the proton beam of high-quality.
Summary of the invention
The object of the present invention is to provide a kind of ejection efficiency high and realize H easily
-two stripping film individual pen line outbound courses in compact cyclotron.
Technical scheme of the present invention is as follows: the two stripping film individual pen line outbound courses in a kind of compact cyclotron, the method arranges the individual pen extraction that a slice stripping film carries out line respectively on the azimuth that two through accelerator centre are relative, two center lines accelerating frequency cavity are arranged in 180 ° of angles each other, the position of two panels stripping film should ensure that the line of drawing is without frequency cavity, and meets following condition simultaneously:
Stripping film I is to the distance R of accelerator centre
3=R
2+ Δ R/2=R
1+ Δ R
Stripping film II is to the distance R of accelerator centre
4=R
3+ Δ R/2=R
2+ Δ R
Wherein, R
1for bundle cluster centre first time line between two stripping films position to the distance of accelerator centre; R
2for Shu Tuanjing frequency cavity accelerates the distance of position to accelerator centre of the line of rear second time between two stripping films; Bundle rolls into a ball the distance increase Δ R/2 of position to accelerator centre of the line often after a frequency cavity is accelerated between two stripping films.
Further, the two stripping film individual pen line outbound courses in compact cyclotron as above, wherein, the full envelope size that line is positioned at extraction location should meet following condition:
<ΔR。
Further, the two stripping film individual pen line outbound courses in compact cyclotron as above, wherein, described stripping film by the stent support with good thermal conductivity, in the middle plane on the accelerator being arranged on line extraction location between lower magnet.
Beneficial effect of the present invention is as follows: the present invention adopts and on the azimuth that accelerator is relative, places a slice stripping film respectively to carry out the individual pen extraction of line.On the one hand, stripping film replaces traditional electrostatic deflection plates, not only make use of stripping film ejection efficiency high, draw advantage easily, peel off the construction of target system and install also more simple, operating cost is also reduced; On the other hand, the present invention takes full advantage of the precession of line, reduces the requirement of accelerator being injected to quality of beam.Apply the present invention to H
-type compact cyclotron, greatly will improve and draw the quality of proton beam, and drawing proton beam will can be used for the field higher to quality of beam requirement such as nuclear physics experiment, H
-the range of application of type compact cyclotron will be expanded further.
Accompanying drawing explanation
Fig. 1 is the precession schematic diagram of bundle group in accelerator;
Fig. 2 is H
-two stripping film individual pen lines in compact cyclotron draw the schematic diagram of embodiment.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
For H
-compact cyclotron, can precession be there is in bundle group when moving in accelerator, that is, line is not only overall to be rotated in accelerator, beam phase space self also can rotate, these two kinds rotate is almost synchronous (i.e. bundle group motion half-turn in accelerator, bundle group's phase space self also half rotation).As shown in Figure 1, the arrow in figure represents the direction of line precession to the situation of bundle group precession in accelerator, represents the full envelope size of line.Shu Tuanzhong outside some particles is become when position 1 place Shu Tuanzhong some particles inwards (i.e. bold portion) moves to position 2 in figure.The present invention arranges the individual pen extraction that a slice stripping film carries out line respectively on the azimuth that two through accelerator centre are relative, line between the position of two panels stripping film is through the center of accelerator, and with the angle that the line of centres of two frequency cavity is certain, make full use of the precession of line, reduce the requirement of accelerator being injected to quality of beam.
As shown in Figure 2, the H provided in the present embodiment
-compact cyclotron places a slice stripping film I and II respectively at extraction radius 60 ° and 240 ° of azimuthal positions.Two are accelerated frequency cavity and are arranged on 0 °, accelerator and 180 ° of azimuthal positions of degree respectively, and bundle group moves outside counter clockwise direction screw, and at every turn through a frequency cavity, the radius of bundle cluster centre is also along with increase.For H
-compact cyclotron, requires that educt beaming flow can not through frequency cavity, otherwise line can be beaten and loses on the lateral wall in chamber.Therefore, require that stripping film is placed on the sector magnetic pole of first and third quadrant as shown in Figure 2.The effect of stripping film allows the H beaten thereon
-particle peels off two electronics and becomes proton.Accelerator is made up of upper and lower magnet, and bundle group moves on central plane, therefore, requires in the middle plane that stripping film is placed on extraction location accelerator between lower magnet.Stent support that stripping film has good thermal conductivity by special (can be radial struts also can be axial support), the Machine Design of stripping system with reference to the corresponding requirements of traditional stripping outbound course, can be determined as the case may be.
Stripping film will meet the following conditions on material is selected:
L charge stripping efficiency is high, therefore has requirement to material, generally can select carbon film.
L heat conduction is good.
The size of l stripping film is greater than beam dimensions, otherwise has line to be lost in without film in accelerator, pollutes accelerator.
The requirement of stripping film material, size and thickness will carry out comprehensive selection by force according to the energy of educt beaming flow and stream, and the selection in different accelerator laboratory also can be different, and the present invention does not do specific requirement to this.
The radius of bundle cluster centre position 1 is in fig. 2 R
1(namely restrainting the distance of position to accelerator centre of the cluster centre line of first time between two stripping films), in-position 2 after frequency cavity a accelerates, radius increases Δ R/2, R
2for Shu Tuanjing frequency cavity accelerates the distance of position to accelerator centre of the line of rear second time between two stripping films, therefore,
R
2=R
1+ΔR/2
Now, bundle group is about to hit on stripping film II (but not knocking), in-position 3 after frequency cavity b accelerates, and the outside some particles of bundle group to hit on stripping film I thus to be drawn, and now requires that the position of stripping film meets following condition:
R
3=R
2+ΔR/2=R
1+ΔR
R
3for stripping film I is to the distance of accelerator centre.
Owing to can there is precession when bundle group moves in accelerator, mean that line is not only overall and rotate in accelerator, beam phase space self also can rotate, at H
-in compact cyclotron, these two kinds rotations are almost synchronous.Therefore, position 3 place is not stripped film I and peels off the some particles inwards of drawing in fig. 2, continue to move across after frequency cavity a accelerates and arrive stripping film II, due to the reason of precession, originally the direction of some particles inwards has become outside, thus be all stripped film II stripping extraction, require that the position of stripping film II meets following condition here:
R
4=R
3+ΔR/2=R
2+ΔR
R
4for stripping film II is to the distance of accelerator centre.
This procedure ensures that stripping film I and stripping film II have drawn the line of a certain circle, therefore educt beaming flow can fall apart less, quality of beam is higher.Therefrom be not difficult to find out, this individual pen line outbound course requires that half envelope of extraction location line is less than the size of the turn separation (Δ R) of line, namely
<ΔR
Wherein, the full envelope size of extraction location line is represented.
And the method that tradition adopts deflector to realize the extraction of line individual pen requires < Δ R.
Visible, this method considerably reduces the restriction to accelerator extraction location line envelope size, correspondingly reduces the requirement to injecting quality of beam.
Design of the present invention is on the basis that extraction design peeled off by traditional accelerator, and at the another set of stripping system of the Position Design that stripping film is relative, draw individual pen line, this quality of beam is higher, can be applied in nuclear physics experiment research.For azimuth, the aspect such as structure and material properties, size and thickness of stripping film, the present invention completely can with reference to the corresponding requirements of traditional stripping outbound course.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technology thereof to these amendments of the present invention and modification, then the present invention is also intended to comprise these change and modification.
Claims (1)
1. the two stripping film individual pen line outbound courses in a compact cyclotron, it is characterized in that: the method arranges the individual pen extraction that a slice stripping film carries out line respectively on the azimuth that two through accelerator centre are relative, described stripping film is by the stent support with good thermal conductivity, in middle plane on the accelerator being arranged on line extraction location between lower magnet, the size of stripping film is greater than beam dimensions; Two center lines accelerating frequency cavity are arranged in 180 ° of angles each other, and the position of two panels stripping film should ensure that the line of drawing is without frequency cavity, and meets following condition simultaneously:
Bundle rolls into a ball the distance R of first stripping film to accelerator centre of process
3=R
2+ Δ R/2=R
1+ Δ R,
Bundle rolls into a ball the distance R of second stripping film to accelerator centre of process
4=R
3+ Δ R/2=R
2+ Δ R,
Wherein, R
1for bundle cluster centre first time line between two stripping films position to the distance of accelerator centre; R
2for Shu Tuanjing frequency cavity accelerates the distance of position to accelerator centre of the line of rear second time between two stripping films; Bundle rolls into a ball the distance increase Δ R/2 of position to accelerator centre of the line often after a frequency cavity is accelerated between two stripping films, and Δ R is the turn separation of line;
Line is positioned at the full envelope size σ of extraction location
beamfollowing condition should be met:
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| CN201210204706.0A CN103517537B (en) | 2012-06-20 | 2012-06-20 | Two stripping film individual pen line outbound courses in compact cyclotron |
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| CN103517537B true CN103517537B (en) | 2016-03-30 |
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| CN105938166B (en) * | 2016-06-12 | 2018-10-26 | 东莞中子科学中心 | A kind of device and its application for the test of electron detachment film |
| CN106163073B (en) * | 2016-07-29 | 2018-11-30 | 中国原子能科学研究院 | A kind of line outbound course of middle energy superconduction bevatron |
| CN106231778A (en) * | 2016-08-31 | 2016-12-14 | 安徽思讯医疗科技有限公司 | The radioisotopic superconducting cyclotron of a kind of production |
| CN106961781B (en) * | 2017-04-24 | 2017-12-22 | 华中科技大学 | A kind of cyclotron peels off target drive device |
| CN107087340B (en) * | 2017-07-04 | 2018-04-03 | 合肥中科离子医学技术装备有限公司 | A kind of line for superconduction bevatron can dissipate governor motion |
| CN108770180A (en) * | 2018-06-27 | 2018-11-06 | 中国原子能科学研究院 | The stripping target kinetic control system and its control method of accelerator |
| CN108873046B (en) * | 2018-07-04 | 2019-10-15 | 中国原子能科学研究院 | Proton beam intensity on-line monitoring system and its method |
| CN108966476B (en) * | 2018-09-04 | 2024-07-02 | 中国原子能科学研究院 | Extraction method and extraction system for improving extraction beam quality of cyclotron |
| CN110831313A (en) * | 2019-10-25 | 2020-02-21 | 中国原子能科学研究院 | Negative hydrogen beam splitting device of particle accelerator |
| CN110913561B (en) * | 2019-12-09 | 2021-03-09 | 中国原子能科学研究院 | Device and method for extracting single-ring beam of stripping extraction cyclotron |
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