CN103517537A - Double-strippable film single-ring beam extraction method applied to compact cyclotron - Google Patents
Double-strippable film single-ring beam extraction method applied to compact cyclotron Download PDFInfo
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- CN103517537A CN103517537A CN201210204706.0A CN201210204706A CN103517537A CN 103517537 A CN103517537 A CN 103517537A CN 201210204706 A CN201210204706 A CN 201210204706A CN 103517537 A CN103517537 A CN 103517537A
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Abstract
The invention relates to beam extraction technology applied to a cyclotron, particularly relates to a double-strippable film single-ring beam extraction method applied to a compact cyclotron. The method comprises the following step that: one strippable film is respectively arranged on opposite azimuth angles of the cyclotron so as to perform single-ring extraction on beams. According to the double-strippable film single-ring beam extraction method of the invention, one the one hand, traditional electrostatic deflection plates are replaced by the strippable films, and therefore, the advantages of high extraction efficiency and convenient extraction can be utilized of the strippable films can be utilized, and the construction and installation of a strippable target system can be simpler, and operation cost is also reduced; and on the other hand, the procession of the beams can be fully utilized, and requirements of injected beam quality for the cyclotron can be lowered.
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 basic principle of drawing is to place a stripping film, H at accelerator line extraction location
-line hits and on film, is stripped from two electronics and becomes H
+thereby the radius of curvature of Particles Moving is drawn in opposite direction.This lead-out mode ejection efficiency high (>99%), and very convenient, therefore, the H of most
-compact cyclotron all adopts this kind of mode to draw proton beam.But peel off, to draw be a kind of multi-turn line lead-out mode, and the emittance of educt beaming flow and line can fall apart often larger, 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 in the world at present electrostatic deflection plates to draw individual pen line.But the installation of electrostatic deflection plates and build equal more complicated, beam loss in spill process is larger, and the stability of accelerator operation can be affected, simultaneously, this lead-out mode requires the line envelope of extraction location to be less than the size of enclosing spacing, to injecting having relatively high expectations of quality of beam.Therefore, be necessary to study a kind of stripping film that adopts and realize the technology that individual pen line is drawn, guarantee that beam extraction efficiency is high, realize easily simultaneously, draw high-quality proton beam.
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 is being drawn through the individual pen that a slice stripping film carries out line is set respectively on two relative azimuths of accelerator centre, two center lines that accelerate frequency cavity are 180 ° of angle settings each other, the position of two stripping films should guarantee 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 arrives the distance of accelerator centre for the first time through the position of the line between two stripping films; R
2for arriving for the second time the distance of accelerator centre through the position of the line between two stripping films after frequency cavity acceleration of Shu Tuanjing; The every distance increase Δ R/2 that arrives accelerator centre after a frequency cavity is accelerated through the position of the line between two stripping films of bundle group.
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 is by the stent support with good thermal conductivity, is arranged on the accelerator of line extraction location on the middle facial planes between lower magnet.
Beneficial effect of the present invention is as follows: the present invention adopts and on the relative azimuth of accelerator, to place respectively the individual pen that a slice stripping film carries out line and draw.On the one hand, stripping film replaces traditional electrostatic deflection plates, not only utilized stripping film ejection efficiency high, draw advantage easily, peel off the construction of target system and install also simplyr, operating cost is also reduced; On the other hand, the present invention takes full advantage of the precession of line, has reduced the requirement of accelerator being injected to quality of beam.Apply the present invention to H
-type compact cyclotron, will be greatly improves the quality of drawing proton beam, draws proton beam by the field that can be used for nuclear physics experiment etc. quality of beam is had relatively high expectations, 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
-the schematic diagram that two stripping film individual pen lines in compact cyclotron are drawn embodiment.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
For H
-compact cyclotron, while moving, can there is precession in bundle group in accelerator, that is to say, line is not only whole to be rotated in accelerator, beam phase space self also can rotate, these two kinds of rotations are almost synchronous (bundle are rolled into a ball motion half-turn in accelerator, and a bundle group phase space self is also rotated half-turn).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.1 Shu Tuanzhong of place part particle (being solid line part) inwards in Tu Zhong position becomes the outside part particle of Shu Tuanzhong while moving to position 2.The present invention is drawing through the individual pen that a slice stripping film carries out line is set respectively on two relative azimuths of accelerator centre, line between the position of two stripping films is through the center of accelerator, and be certain angle with the line of centres of two frequency cavity, make full use of the precession of line, reduced the requirement of accelerator being injected to quality of beam.
As shown in Figure 2, the H providing in the present embodiment
-compact cyclotron is being drawn 60 ° of radiuses and a slice stripping film I and II are placed respectively in 240 ° of azimuthal positions.Two acceleration frequency cavity are arranged on respectively 0 °, accelerator and 180 ° of azimuthal positions of degree, and bundle group moves outward along counter clockwise direction screw, and during at every turn through a frequency cavity, the radius of bundle cluster centre is also along with increase.For H
-compact cyclotron, requires educt beaming flow can not pass through frequency cavity, otherwise loses on the lateral wall in line Hui Da chamber.Therefore, require stripping film to be placed on the sector magnetic pole of first and third quadrant as shown in Figure 2.The effect of stripping film is to allow beat H thereon
-particle peels off two electronics and becomes proton.Accelerator is comprised of upper and lower magnet, and bundle group moves on central plane, therefore, requires stripping film to be placed on extraction location accelerator on the middle facial planes between lower magnet.Stripping film is by the stent support with good thermal conductivity (can be that radial struts can be also axial support) of special use, and the Machine Design of stripping system can, with reference to traditional corresponding requirements of peeling off outbound course, 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 material is had to requirement, generally can select carbon film.
L heat conduction is good.
The size of l stripping film is greater than line size, otherwise has line to be lost in accelerator without film, pollutes accelerator.
The requirement of stripping film material, size and thickness will be carried out by force comprehensive selection according to the energy of educt beaming flow and stream, and the selection in different accelerators laboratory also can be different, and the present invention does not do specific requirement to this.
The radius of bundle cluster centre Tu2Zhong position 1 is R
1(restraint cluster centre and through the position of the line between two stripping films, arrive for the first time the distance of accelerator centre), in-position 2 after frequency cavity a accelerates, radius increases Δ R/2, R
2for arriving for the second time the distance of accelerator centre through the position of the line between two stripping films after frequency cavity acceleration of Shu Tuanjing, therefore,
R
2?=?R
1?+?ΔR/2
Now, bundle group is about to hit in stripping film II (but not knocking), and in-position 3 after frequency cavity b accelerates is drawn thereby the outside part particle of bundle group hits on stripping film I, now requires the position of stripping film to meet following condition:
R
3?=?R
2?+ΔR/2?=?R
1?+ΔR
R
3for the distance of stripping film I to accelerator centre.
While moving in accelerator due to bundle group, precession can occur, mean that line is not only whole rotates in accelerator, and beam phase space self also can rotate, at H
-in compact cyclotron, these two kinds of rotations are almost synchronous.Therefore, 3 places, Tu2Zhong position are not stripped from film I and peel off the part particle inwards of drawing, continue motion and arrive stripping film II after frequency cavity a accelerates, reason due to precession, originally the direction of part particle inwards has outwards become, thereby be all stripped from film II, peel off and draw, require stripping film Ⅱ position to meet following condition here:
R
4?=?R
3?+ΔR?/2?=?R
2?+ΔR
R
4for the distance of stripping film II to accelerator centre.
This process has guaranteed that stripping film I and stripping film II only drawn the line of a certain circle, thus educt beaming flow can fall apart littlely, quality of beam is higher.Therefrom be not difficult to find out, half envelope of this individual pen line outbound course requirement extraction location line is less than the size of the circle spacing (Δ R) of line,
<ΔR
Wherein, the full envelope size that represents extraction location line.
And tradition adopts deflector to realize the method requirement < Δ R that line individual pen is drawn.
Visible, this method has obviously reduced the restriction to accelerator extraction location line envelope size, has correspondingly reduced injecting the requirement of quality of beam.
Design of the present invention is to peel off on the basis of drawing design at traditional accelerator, at the another set of stripping system of the relative Position Design of stripping film, draws individual pen line, and this quality of beam is higher, can be applied in nuclear physics experiment research.For the aspects such as azimuth, structure and material properties, size and thickness of stripping film, the present invention completely can be with reference to traditional corresponding requirements of peeling off outbound course.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technology thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (3)
1. two stripping film individual pen line outbound courses in a compact cyclotron, it is characterized in that: the method is being drawn through the individual pen that a slice stripping film carries out line is set respectively on two relative azimuths of accelerator centre, two center lines that accelerate frequency cavity are 180 ° of angle settings each other, the position of two stripping films should guarantee 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 arrives the distance of accelerator centre for the first time through the position of the line between two stripping films; R
2for arriving for the second time the distance of accelerator centre through the position of the line between two stripping films after frequency cavity acceleration of Shu Tuanjing; The every distance increase Δ R/2 that arrives accelerator centre after a frequency cavity is accelerated through the position of the line between two stripping films of bundle group.
2. two stripping film individual pen line outbound courses in compact cyclotron as claimed in claim 1, is characterized in that: the full envelope size that line is positioned at extraction location should meet following condition:
<ΔR。
3. two stripping film individual pen line outbound courses in compact cyclotron as claimed in claim 1 or 2, it is characterized in that: described stripping film is by the stent support with good thermal conductivity, be arranged on the accelerator of line extraction location on the middle facial planes between lower magnet.
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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 CN103517537B (en) | 2016-03-30 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938166A (en) * | 2016-06-12 | 2016-09-14 | 东莞中子科学中心 | Apparatus for testing electronic peeling membrane, and application thereof |
| 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 |
| CN106961781A (en) * | 2017-04-24 | 2017-07-18 | 华中科技大学 | A kind of cyclotron peels off target drive device |
| CN107087340A (en) * | 2017-07-04 | 2017-08-22 | 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 |
| CN108873046A (en) * | 2018-07-04 | 2018-11-23 | 中国原子能科学研究院 | Proton beam intensity on-line monitoring system and its method |
| 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 |
| CN108966476A (en) * | 2018-09-04 | 2018-12-07 | 中国原子能科学研究院 | Improve the outbound course and extraction system of cyclotron educt beaming flow quality |
| CN110913561A (en) * | 2019-12-09 | 2020-03-24 | 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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| 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 |
| CN105938166A (en) * | 2016-06-12 | 2016-09-14 | 东莞中子科学中心 | Apparatus for testing electronic peeling membrane, and application thereof |
| 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 |
| CN106961781A (en) * | 2017-04-24 | 2017-07-18 | 华中科技大学 | A kind of cyclotron peels off target drive device |
| CN106961781B (en) * | 2017-04-24 | 2017-12-22 | 华中科技大学 | A kind of cyclotron peels off target drive device |
| US10390418B2 (en) | 2017-07-04 | 2019-08-20 | Hefei Cas Ion Medical And Technical Devices Co., Ltd. | Beam energy dispersion adjusting mechanism for superconducting proton cyclotron |
| 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 |
| WO2019006914A1 (en) * | 2017-07-04 | 2019-01-10 | 合肥中科离子医学技术装备有限公司 | Beam energy dissipation adjusting mechanism used for superconducting proton cyclotron |
| CN107087340A (en) * | 2017-07-04 | 2017-08-22 | 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 |
| CN108873046A (en) * | 2018-07-04 | 2018-11-23 | 中国原子能科学研究院 | Proton beam intensity on-line monitoring system and its method |
| 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 |
| CN108966476A (en) * | 2018-09-04 | 2018-12-07 | 中国原子能科学研究院 | Improve the outbound course and extraction system of cyclotron educt beaming flow quality |
| CN110913561A (en) * | 2019-12-09 | 2020-03-24 | 中国原子能科学研究院 | Device and method for extracting single-ring beam of stripping extraction cyclotron |
| 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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