WO2006008839A1 - 螺旋軌道型荷電粒子加速器及びその加速方法 - Google Patents
螺旋軌道型荷電粒子加速器及びその加速方法 Download PDFInfo
- Publication number
- WO2006008839A1 WO2006008839A1 PCT/JP2004/015989 JP2004015989W WO2006008839A1 WO 2006008839 A1 WO2006008839 A1 WO 2006008839A1 JP 2004015989 W JP2004015989 W JP 2004015989W WO 2006008839 A1 WO2006008839 A1 WO 2006008839A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- acceleration
- radius
- forming
- distribution
- Prior art date
Links
Classifications
-
- 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
-
- 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
- H05H15/00—Methods or devices for acceleration of charged particles not otherwise provided for, e.g. wakefield accelerators
Definitions
- the present invention relates to a charged particle accelerator, and more particularly to a spiral orbit type charged particle accelerator and an acceleration method thereof.
- a cyclotron a representative example of a helical orbital charged particle accelerator, was invented by Lawrence in 1930, and its structure is shown in Fig. 1 (a) and (b). 1, an acceleration electrode 12 for accelerating charged particles, and an ion source 13 for forming charged particles.
- the magnetic pole 11 is composed of a magnet N pole 15 and S pole 16. The accelerated particles travel on the spiral accelerated particle orbit 14.
- ⁇ is the pi
- m is the mass of the moving particle (kg)
- e is its charge (Coulomb)
- B is the magnetic flux density (Tesla) on the particle orbit.
- Mass m is expressed by the following equation using static mass m and particle velocity v (mZ seconds).
- c is the speed of light (approximately 3 X 10 mZ seconds).
- Equation (1) if mZeB is constant, the rotational period of the particles is always constant regardless of the radius of rotation. Such a magnetic field distribution is called an isochronous magnetic field distribution.
- the period of the high frequency that accelerates the particles may be constant.
- Figure 2 shows the relationship between the phase of the particles and the phase of the acceleration radio frequency in this case.
- Figure 2 is a waveform diagram of the accelerated high-frequency voltage with the voltage on the vertical axis and time on the horizontal axis.
- the ratio of the acceleration high-frequency period (T) to the particle rotation period (T) is called the harmonic number N
- R is the radius of curvature of the particle orbit.
- a ring cyclotron as shown in Fig. 3 was developed.
- This ring cyclotron employs a structure in which several deflecting magnets (sector 1) 31 are individually separated and arranged, and a high-frequency acceleration cavity 32 is disposed therebetween.
- a method is adopted in which a low-energy beam accelerated in advance is incident on the particle incident position 33! / ⁇ .
- the incident accelerated particles travel along the spiral accelerated particle trajectory 34 and are extracted at an extraction position (not shown).
- the radius of curvature of the particle orbit at the incident position is defined as the incident radius and the energy of the particle at the incident position as the incident energy.
- the radius of curvature of the particle trajectory at the extraction position is called the extraction radius, and the energy of the particles at the extraction position is called the extraction energy.
- the high-frequency accelerating cavity and the deflecting magnet are spatially separated, so that the acceleration energy per round can be set to 500 MeV or more (see Non-Patent Document 1).
- This ring cyclotron is also designed to satisfy the isochronous magnetic field distribution.
- the average magnetic field in the orbit is designed to keep T in equation (1) constant.
- Non-Patent Document 1 Kamei Kaoru and Motoki Kihara, “Parity Physics Course Accelerator Science” Maruzen Co., Ltd., September 20, 1993 P. 210— 211
- An object of the present invention is to increase the particle extraction energy without increasing the magnet relative to the incident energy, that is, to increase the energy gain, in a spiral orbital charged particle accelerator having a magnet arrangement such as a ring cyclotron. It is to be. Means for solving the problem
- the magnetic field distribution and the acceleration high-frequency voltage distribution are formed such that a harmonic number, which is a ratio of a charged particle rotation period to an acceleration high-frequency period, changes in integer units.
- a helical orbit type charged particle accelerator is provided.
- the means for forming the acceleration high-frequency voltage distribution maintains the amplitude of the acceleration high-frequency voltage constant with respect to the radius, and the means for forming the magnetic field distribution has a harmonic number for each round of acceleration. It is preferable to increase the magnetic field strength with respect to the radius so that it decreases in integer units.
- the means for forming the magnetic field distribution is such that the average magnetic field B at the orbit radius is changed to the incident radius R
- the means for maintaining the relationship of R ii and forming the acceleration high-frequency voltage distribution preferably modulates the amplitude of the acceleration voltage with respect to the radius so that the harmonic number decreases by an integer unit for each round of acceleration. Masashi.
- a step of forming a non-isomagnetic magnetic field distribution in which the magnetic field strength increases with an increase in radius, and an accelerated high frequency with a fixed frequency are provided.
- Forming a voltage distribution, the magnetic field distribution and the The acceleration high-frequency voltage distribution is provided such that the harmonic number, which is the ratio of the charged particle rotation period to the acceleration high-frequency period, changes in integer units.
- the amplitude of the acceleration high-frequency voltage is maintained constant with respect to the radius, and in the step of forming the magnetic field distribution, the harmonic number is increased for each round of acceleration. It is preferable to increase the magnetic field strength with respect to the radius so that it decreases in integer units.
- the average magnetic field B at the orbit radius is changed to the incident radius R.
- the step of maintaining the R ii relationship and forming the acceleration high-frequency voltage distribution it is preferable to modulate the amplitude of the acceleration voltage with respect to the radius so that the harmonic number decreases in integer units for each acceleration of one revolution. ⁇ .
- the basic principle of the present invention is that the strength of the magnetic field with respect to the radius is reduced so that the harmonic number (calo fast particle period Z high frequency period) decreases by an integer for each week of acceleration. It is a way to increase. In other words, every rotation, N is decreased by an integer unit.
- FIG. 5 illustrates this in comparison with the conventional cyclotron.
- the rotation period of the particles is shortened for each acceleration as compared with the conventional cyclotron. That is, it can be seen that the energy increase rate of the present invention is larger when the incident and extraction radii are the same as those of the conventional cyclotron.
- Magnetic field that satisfies the above equation (7) or Figure 5 There are an infinite number of acceleration voltage conditions, but two examples will be described below.
- FIG. 6 shows an example of a helical orbit type charged particle accelerator to which the present invention is applied when the acceleration voltage is constant with respect to the radius.
- Incident particle rotation period 0.125 s
- the magnetic field B has an unequal magnetic field distribution in which the magnetic field strength increases as the radius R increases.
- the ratio of the extraction radius Z incident radius is not so large (about 2.16 in the above example)
- the ratio of the extraction energy to the incident energy becomes large (8.75 in the above example).
- a large energy gain can be obtained compared to a ring cyclotron.
- the acceleration voltage distribution may be obtained so as to satisfy this ⁇ repulsive force S (7).
- Incident particle rotation period 0.25 s
- Acceleration frequency period 0.5ns
- the magnetic field B has an unequal magnetic field distribution in which the magnetic field strength increases as the radius R increases. Furthermore, the accelerating voltage also increases as the radius R increases. As a result, even if the ratio of the extraction radius Z incident radius is not larger than the example in Fig. 6 (about 1.36 in the above example), the ratio of the extraction energy to the incident energy is further increased (in the above example, 12 5) So much higher energy gain than the example in Fig. 6 can be obtained.
- Fig. 8 is a diagram showing temporal changes in particle energy and acceleration voltage when the acceleration voltage is temporally modulated when it is difficult to form a radial voltage distribution as shown in Fig. 7. It is. Even in this case, the acceleration voltage increases as the acceleration proceeds, so that an energy gain larger than that in the example of FIG. 6 is obtained.
- FIG. 1 is a diagram for explaining the principle of a cyclotron, in which (A) is a view taken along the line A—A in (B), and (B) is a sectional view taken along the line B—B in (A). It is.
- FIG. 2 is a diagram showing the relationship between the acceleration high-frequency period of the cyclotron and the particle rotation period.
- FIG. 3 is a simple plan view of a ring cyclotron.
- FIG. 4 is a diagram showing the acceleration principle of the present invention.
- FIG. 5 is a graph showing the relationship between particle rotation speed and particle rotation period.
- FIG. 6 is a diagram showing the relationship between magnetic field and particle energy in an example of the present invention.
- FIG. 7 is a diagram showing the relationship among magnetic field, particle energy and acceleration voltage in another example of the present invention.
- FIG. 8 is a diagram showing temporal changes in particle energy and acceleration voltage when the acceleration voltage is temporally modulated in the embodiment of FIG.
- Ion source 14 Accelerated particle orbit 15 Magnet N pole 16 Magnet S pole 31 Bending magnet 32 High frequency acceleration cavity 33 Particle incident position 34 Accelerated particle orbit T Particle rotation period
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/397,257 US7262565B2 (en) | 2004-07-21 | 2006-04-03 | Spiral orbit charged particle accelerator and its acceleration method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-213129 | 2004-07-21 | ||
JP2004213129A JP4104008B2 (ja) | 2004-07-21 | 2004-07-21 | 螺旋軌道型荷電粒子加速器及びその加速方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/397,257 Continuation US7262565B2 (en) | 2004-07-21 | 2006-04-03 | Spiral orbit charged particle accelerator and its acceleration method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006008839A1 true WO2006008839A1 (ja) | 2006-01-26 |
Family
ID=35784974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015989 WO2006008839A1 (ja) | 2004-07-21 | 2004-10-28 | 螺旋軌道型荷電粒子加速器及びその加速方法 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7262565B2 (ja) |
JP (1) | JP4104008B2 (ja) |
WO (1) | WO2006008839A1 (ja) |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2259664B1 (en) | 2004-07-21 | 2017-10-18 | Mevion Medical Systems, Inc. | A programmable radio frequency waveform generator for a synchrocyclotron |
US8581523B2 (en) * | 2007-11-30 | 2013-11-12 | Mevion Medical Systems, Inc. | Interrupted particle source |
US8933650B2 (en) | 2007-11-30 | 2015-01-13 | Mevion Medical Systems, Inc. | Matching a resonant frequency of a resonant cavity to a frequency of an input voltage |
JP4865934B2 (ja) * | 2010-04-26 | 2012-02-01 | 株式会社Quan Japan | 荷電粒子加速器および荷電粒子の加速方法 |
JP5665721B2 (ja) * | 2011-02-28 | 2015-02-04 | 三菱電機株式会社 | 円形加速器および円形加速器の運転方法 |
US10254739B2 (en) | 2012-09-28 | 2019-04-09 | Mevion Medical Systems, Inc. | Coil positioning system |
TW201438787A (zh) | 2012-09-28 | 2014-10-16 | Mevion Medical Systems Inc | 控制粒子治療 |
US9681531B2 (en) | 2012-09-28 | 2017-06-13 | Mevion Medical Systems, Inc. | Control system for a particle accelerator |
EP2900325B1 (en) | 2012-09-28 | 2018-01-03 | Mevion Medical Systems, Inc. | Adjusting energy of a particle beam |
JP6254600B2 (ja) | 2012-09-28 | 2017-12-27 | メビオン・メディカル・システムズ・インコーポレーテッド | 粒子加速器 |
EP2901821B1 (en) | 2012-09-28 | 2020-07-08 | Mevion Medical Systems, Inc. | Magnetic field regenerator |
WO2014052709A2 (en) | 2012-09-28 | 2014-04-03 | Mevion Medical Systems, Inc. | Controlling intensity of a particle beam |
JP6523957B2 (ja) | 2012-09-28 | 2019-06-05 | メビオン・メディカル・システムズ・インコーポレーテッド | 磁場を変更するための磁性シム |
JP6121544B2 (ja) | 2012-09-28 | 2017-04-26 | メビオン・メディカル・システムズ・インコーポレーテッド | 粒子ビームの集束 |
US8791656B1 (en) | 2013-05-31 | 2014-07-29 | Mevion Medical Systems, Inc. | Active return system |
US9730308B2 (en) | 2013-06-12 | 2017-08-08 | Mevion Medical Systems, Inc. | Particle accelerator that produces charged particles having variable energies |
US10258810B2 (en) | 2013-09-27 | 2019-04-16 | Mevion Medical Systems, Inc. | Particle beam scanning |
US10675487B2 (en) | 2013-12-20 | 2020-06-09 | Mevion Medical Systems, Inc. | Energy degrader enabling high-speed energy switching |
US9962560B2 (en) | 2013-12-20 | 2018-05-08 | Mevion Medical Systems, Inc. | Collimator and energy degrader |
US9661736B2 (en) | 2014-02-20 | 2017-05-23 | Mevion Medical Systems, Inc. | Scanning system for a particle therapy system |
US9950194B2 (en) | 2014-09-09 | 2018-04-24 | Mevion Medical Systems, Inc. | Patient positioning system |
US10786689B2 (en) | 2015-11-10 | 2020-09-29 | Mevion Medical Systems, Inc. | Adaptive aperture |
EP3481503B1 (en) | 2016-07-08 | 2021-04-21 | Mevion Medical Systems, Inc. | Treatment planning |
US11103730B2 (en) | 2017-02-23 | 2021-08-31 | Mevion Medical Systems, Inc. | Automated treatment in particle therapy |
EP3645111A1 (en) | 2017-06-30 | 2020-05-06 | Mevion Medical Systems, Inc. | Configurable collimator controlled using linear motors |
CN109599190B (zh) * | 2018-11-27 | 2020-06-23 | 中国原子能科学研究院 | 一种提高高能圆型加速器圈能量增益的方法 |
US11291861B2 (en) | 2019-03-08 | 2022-04-05 | Mevion Medical Systems, Inc. | Delivery of radiation by column and generating a treatment plan therefor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11176597A (ja) * | 1997-12-11 | 1999-07-02 | Hitachi Ltd | 高周波加速空胴の制御装置 |
JP2001267099A (ja) * | 2000-03-24 | 2001-09-28 | Sumitomo Heavy Ind Ltd | ベータトロン振動数測定装置及び測定方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA990404A (en) * | 1974-08-01 | 1976-06-01 | Stanley O. Schriber | Double pass linear accelerator operating in a standing wave mode |
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 |
-
2004
- 2004-07-21 JP JP2004213129A patent/JP4104008B2/ja not_active Expired - Fee Related
- 2004-10-28 WO PCT/JP2004/015989 patent/WO2006008839A1/ja active Application Filing
-
2006
- 2006-04-03 US US11/397,257 patent/US7262565B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11176597A (ja) * | 1997-12-11 | 1999-07-02 | Hitachi Ltd | 高周波加速空胴の制御装置 |
JP2001267099A (ja) * | 2000-03-24 | 2001-09-28 | Sumitomo Heavy Ind Ltd | ベータトロン振動数測定装置及び測定方法 |
Also Published As
Publication number | Publication date |
---|---|
US7262565B2 (en) | 2007-08-28 |
US20060175991A1 (en) | 2006-08-10 |
JP2006032282A (ja) | 2006-02-02 |
JP4104008B2 (ja) | 2008-06-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006008839A1 (ja) | 螺旋軌道型荷電粒子加速器及びその加速方法 | |
JP5665721B2 (ja) | 円形加速器および円形加速器の運転方法 | |
WO2004073364A1 (ja) | 荷電粒子加速器 | |
JPH11513528A (ja) | アイソクロナスサイクロトロンから荷電粒子を抽出する方法及びこの方法を応用する装置 | |
US8207656B2 (en) | B-K electrode for fixed-frequency particle accelerators | |
JP2004031115A (ja) | サイクロトロンで加速するビームの位相幅制限方法および位相幅制限装置 | |
Zdorovets et al. | Accelerator complex based on DC-60 cyclotron | |
WO2016174700A1 (ja) | 円形加速器 | |
US9215790B2 (en) | Formation of multiple proton beams using particle accelerator and stripper elements | |
Heikkinen | Injection and extraction for cyclotrons | |
Kolomenski et al. | The effect of radiation on the motion of relativistic electrons in a synchrotron | |
RU2058676C1 (ru) | Способ охлаждения пучка заряженных частиц | |
Brown et al. | Improving extraction efficiency of the third integer resonant extraction using higher order multipoles | |
US20210195726A1 (en) | Linear accelerator using a stacked array of cyclotrons | |
US20130307438A1 (en) | Centroidal Cycltron Charged Paticle Accelerator | |
Anggraita et al. | Beam tracking simulation in the central region of a 13 MeV PET cyclotron | |
JP3248737B2 (ja) | 荷電粒子装置 | |
JP4104007B2 (ja) | 周回軌道型荷電粒子加速器及びその加速方法 | |
Jeon et al. | Analysis of axis-encircling electron beam using a single-cusp magnetic field | |
Lebrun | Particle accelerators, instruments of discovery in physics | |
JP2021141062A (ja) | 各種のエネルギーのビームを取り出すためのシンクロサイクロトロン | |
Hauschild | Particle Accelerator—How Does that Work? | |
JP6663618B2 (ja) | 加速器および粒子線照射装置 | |
JP4002977B2 (ja) | Ffag加速器 | |
JP2006127822A (ja) | 円形荷電粒子加速器およびその円形荷電粒子加速器の運転方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11397257 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 11397257 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |