WO2004073364A1 - 荷電粒子加速器 - Google Patents
荷電粒子加速器 Download PDFInfo
- Publication number
- WO2004073364A1 WO2004073364A1 PCT/JP2004/001470 JP2004001470W WO2004073364A1 WO 2004073364 A1 WO2004073364 A1 WO 2004073364A1 JP 2004001470 W JP2004001470 W JP 2004001470W WO 2004073364 A1 WO2004073364 A1 WO 2004073364A1
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- WIPO (PCT)
- Prior art keywords
- acceleration
- charged particle
- period
- particle accelerator
- acceleration period
- Prior art date
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Classifications
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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
- H05H11/00—Magnetic induction accelerators, e.g. betatrons
Definitions
- the present invention relates to a circular particle accelerator for accelerating charged particles, and more particularly to a small charged particle accelerator capable of accelerating a large current beam.
- the FFAG Fixed Field Alternating Gradient
- the FFAG Fixed Field Alternating Gradient
- the magnetic field generated by the bending electromagnet is constant, and the equilibrium orbit spreads out of the orbit as the charged particle accelerates.
- Non-Patent Document 2 There is a betatron accelerator that accelerates in a constant orbit without changing the equilibrium orbit. (For example, see Non-Patent Document 2).
- Non-Patent Document 1 The beam generated by the source is incident and orbits in a substantially circular orbit with the deflecting magnetic field of the deflecting electromagnet. Acceleration is performed by the applied electric field. During acceleration, the bending magnetic field of the bending electromagnet is constant, and the equilibrium orbit moves out of the accelerator with beam acceleration. The magnetic field strength of the bending electromagnet increases as it goes to the outside, but since the magnetic field of the bending electromagnet is constant, the overall size of the device is large, miniaturization is difficult, and its application fields have been limited.
- the present invention has been made to solve the above-described problems.
- a laptop type of about 30 ⁇ ⁇ ⁇ is extremely small and has a large current acceleration.
- the aim is to provide charged particle accelerators that can be used in various fields, such as industrial, medical, and other fields.
- Another object of the present invention is to provide a compact accelerator for accelerating protons or carbon as charged particles. Disclosure of the invention
- a charged particle accelerator according to the present invention is a charged particle accelerator including a charged particle generator, a bending electromagnet, acceleration means, and a vacuum duct,
- a charged particle accelerator according to the present invention is a charged particle accelerator including a charged particle generator, a bending electromagnet, acceleration means, and a vacuum duct,
- the charged particles guided into the vacuum duct from the charged particle generator are deflected by the deflection electromagnet and accelerated to a predetermined energy through a first acceleration period and a second acceleration period.
- the electric field by the acceleration means is applied from the acceleration start time of the first acceleration period to the end time of the extraction period, and the magnetic field of the bending electromagnet is applied at a constant value during the first acceleration period,
- the second acceleration period is applied so as to increase until the end time of the second acceleration period, and the take-out period is applied so as to keep the end value in the second acceleration period constant.
- the charged particle accelerator of this invention it is small and compact, the space charge effect can be suppressed, a high output beam can be accelerated, and the excellent effect that a high output and high quality beam can be obtained is produced.
- FIG. 1 is a plan view showing a charged particle accelerator according to Embodiments 1 to 5 of the present invention.
- FIG. 2 is a diagram showing a time structure of a deflection magnetic field and an acceleration core magnetic field according to the first embodiment of the present invention.
- FIG. 3 is a diagram showing a time structure of a deflection magnetic field and an acceleration core magnetic field according to Embodiment 2 of the present invention.
- FIG. 4 is a diagram showing a time structure of a deflection magnetic field and an acceleration core magnetic field according to Embodiment 3 of the present invention.
- FIG. 5 is a diagram showing a time structure of a deflection magnetic field and an acceleration core magnetic field according to Embodiment 4 of the present invention.
- FIG. 1 is a plan view showing the charged particle accelerator 100.
- FIG. 1 is a plan view showing the charged particle accelerator 100.
- a charged particle beam (hereinafter, referred to as a beam) generated by a charged particle generator 11 enters a vacuum duct 15 from a septum electrode 12.
- the beam is deflected by the bending electromagnet 13 and orbits in a substantially circular orbit.
- the beam is accelerated by an induced electric field generated by electromagnetic induction by AC excitation from the acceleration core power supply 17 to the acceleration core 14.
- the beam orbits the vacuum duct 15 so that the beam does not collide with air and is lost.
- the typical equilibrium orbitals are schematically shown as 16a, 16b, 16c, and 16d.
- the bending electromagnet 13 is excited by a bending magnet power supply 18.
- the accelerating core 14 and the accelerating core power supply 17 are referred to as accelerating means.
- FIG. 2 shows a deflection magnetic field 20 generated by the bending electromagnet 13 and an acceleration generated in the acceleration core 14 for accelerating a beam of the charged particle accelerator 100 according to Embodiment 1 of the present invention. This shows the time structure of the core magnetic field 21.
- the time structure of the deflection magnetic field 20 and the time structure of the acceleration core magnetic field 21 shown in FIG. 2 do not satisfy the betatron acceleration conditions.
- the betatron acceleration condition is a relationship between the deflection magnetic field 20 and the acceleration core magnetic field 21 such that the orbit (equilibrium orbit) of the beam during acceleration is constant.
- a first acceleration period 22 for accelerating a beam and a second acceleration period 23 are provided.
- the acceleration core magnetic field 21 is changed so as to increase with time from the beam injection start time 25 until the beam reaches a predetermined energy. Accordingly, an induced electric field is applied in the traveling direction of the beam, and the beam incident at time 25 is also accelerated during the first acceleration period 22.
- the deflecting magnetic field of the deflecting electromagnet 13 is constant, and the beam gradually increases, as shown in the typical balanced orbits 16 a to 16 d in FIG. Spread outward.
- the beam Since the beam is continuously incident during the first acceleration period 22, at the end time 26 of the first acceleration period 22, the beam spread horizontally in the charged particle accelerator 100. Orbiting.
- the beam incident at the start time of the first (acceleration start time) 25 orbits the outermost orbit 16 d with the highest energy. ing.
- the beam incident just before the injection end time 26 in the first acceleration period 22 orbits the orbit 16a near the innermost with the lowest energy. That is, at the first acceleration period end time 26, the energy width is large, and the horizontally spread beam orbits the charged particle accelerator 100.
- the magnetic pole shape of the bending electromagnet 13 is set so that the magnetic field intensity becomes larger outside the beam orbit so that the beam deviated from the balanced orbit stably circulates.
- the operation shifts to the second acceleration period 23.
- the second acceleration period 23 has an excitation pattern that increases both the deflection magnetic field 20 and the acceleration core magnetic field 21 with time.
- the excitation pattern is adjusted to a condition close to the beta-ton acceleration condition in the charged particle accelerator 100, that is, the polarized magnetic field 200 is set so that the orbit (equilibrium orbit) of the beam being accelerated is constant.
- the acceleration core magnetic field 21 is set so as to accelerate.
- the beam has a large energy width and spreads horizontally. It is accelerated until it reaches a predetermined energy while maintaining it.
- the beam that has reached the predetermined energy is taken out of the orbit from the deflector 30 shown in FIG. 1, and is used for various beam applications by the output beam transport system 31.
- a beam is made to collide with the X-ray target 29 shown in FIG. 1 to generate X-rays, which are used for various X-ray applications.
- the space charge effect can be suppressed by a compact structure, and the number of the conventional betatron accelerator can be reduced from 10 times to 100 times. It is capable of achieving twice as large output and large beam acceleration.
- the means for generating the accelerating electric field may be an induction electric field as in the example of the present embodiment or a high-frequency electric field supplied from a high-frequency power supply.
- Embodiment 2 of the present invention will be described with reference to FIG.
- FIG. 3 is a time structure diagram of the deflection magnetic field 20 and the acceleration core magnetic field 21 according to the second embodiment, which is similar to the first embodiment.
- the acceleration core magnetic field 21 has a negative value at the start time 25 of the first acceleration period 22, that is, at the beam incident start time 25. Thereafter, the voltage is applied so as to increase in the positive direction with the passage of time until the end time of the second acceleration period 23.
- the acceleration core magnetic field 21 has a time structure that generates positive and negative magnetic fields.
- the space charge effect can be suppressed, and a high-power beam can be realized with a compact structure.
- Embodiment 3 of the present invention will be described with reference to FIG.
- FIG. 4 is a time structure diagram of the deflection magnetic field 20 and the acceleration core magnetic field 21 in the third embodiment.
- the time structure of the deflection magnetic field 20 increases with time from the first acceleration period start time 25 to the first acceleration period end time 26. That is, the deflection magnetic field 20 is changed within the first acceleration period 22. At this time, it is necessary to change the beam energy of the charged particle generator 11 as well.
- the space charge effect can be suppressed in the same manner as described above, and a high-power beam can be accelerated by a compact device.
- Embodiment 4 of the present invention will be described with reference to FIG.
- FIG. 5 is a time structure diagram of the deflection magnetic field 20 and the acceleration core magnetic field 21 in the fourth embodiment.
- the time structures of the deflection magnetic field 20 and the acceleration core magnetic field 21 are, as shown in FIG. 5, a first acceleration period 22, a second acceleration period 23, There is a beam extraction period 24 following the second acceleration period 23.
- the accelerating core magnetic field 21 is applied so as to increase from the beam incident start time 25 to the end time 28 of the beam extraction period with time.
- the deflecting magnetic field 20 is a magnetic field having a constant strength within the first acceleration period 22, and is determined from the end time 26 of the first acceleration period 22, that is, from the start time of the second acceleration period 23. Applied to increase until end time 28.
- the magnetic field of the terminal value of the second acceleration period 22 is applied so as to be kept constant until the end time 28.
- the beam has a large energy width and is accelerated while keeping the beam characteristics spread horizontally.
- This beam is X-rays are generated by colliding with the X-ray target 29 shown in Fig. 1, and these X-rays can be used for industry and medical care.
- the beam is accelerated while keeping the horizontal beam width almost as shown in the typical equilibrium orbits 16a to 16d in FIG.
- the beam extraction period 24 is entered and beam extraction is started. This time corresponds to 27 in FIG.
- the increase in the deflection magnetic field 20 of the bending electromagnet 13 is stopped, and the relationship between the deflection magnetic field 20 and the acceleration core magnetic field 21 is maintained so that the equilibrium trajectory of the beam during acceleration changes with time. Control.
- the accelerating core magnetic field 21 is changing, so an induced electric field is applied in the traveling direction of the charged beam, and the representative equilibrium orbits 16a, 16b, and 16c are shown.
- the beam gradually spreads outward.
- the beam is made to collide with the X-ray target 29 installed outside the orbit to generate X-rays. That is, X-rays can be generated during the beam extraction period 24 in FIG. Since the beam energy at the time of collision with the X-ray target 29 accelerates during the beam extraction, the beam energy colliding with the X-ray target 29 at the beam extraction start time 27 also ends The beam energy colliding at time 28 is almost the same.
- the beam when accelerating the beam, the beam has a large energy width, is accelerated while maintaining the horizontally spread beam characteristics, and almost collides with the X-ray target 29.
- the energy is constant, and high quality X-rays can be obtained.
- a space-saving effect can be suppressed with a compact device, a high-power beam can be accelerated, and X-rays can be generated using a high-power, high-quality electron beam with almost constant energy width. .
- Embodiment 5 will be described with reference to FIG.
- the fifth embodiment of the present invention is different from the fourth embodiment in that the X-ray target 29 of the fourth embodiment is replaced with a deflector 30 as a beam extracting means.
- FIG. 1 shows an example in which the deflector 30 is provided at a location different from the X-ray target 29, but may be located at the same position instead of the X-ray target 29.
- the beam when the beam is accelerated, the beam is accelerated while maintaining a wide energy width and a horizontally spread beam characteristic, but reaches the output beam output transport system 31. When it does, the energy becomes almost constant and a good beam can be extracted.
- the space charge effect can be suppressed with a compact device, a high-power beam can be accelerated, and a high-power, high-quality beam can be obtained. It has the effect of being able to do it.
- the excitation pattern for exciting the deflection electromagnet and the acceleration core is the second pattern.
- the shape may be a straight line as shown in FIGS. 5 to 5, or may not necessarily be a straight line but may be a curved line or a broken line.
- the power supply be a stabilized DC power supply, and the setting accuracy of the required exciting current may be low.
- a switching power supply that performs DC voltage ON / OFF switching may be used.
- power semiconductor switching elements such as IGBTs and MOSFETs turn on and off the DC voltage to create the excitation waveform.
- FIG. 1 shows an example in which the charged particle generator 11 is provided at the center of the charged particle accelerator 100, but the present invention is not limited to this.
- the charged particle generator 11 can be arranged in the vacuum duct of the charged particle accelerator 100, which contributes to the compactness of the entire device.
- the charged particle accelerator of the present invention can be widely used in industrial or medical fields, such as an X-ray generator and a particle beam therapy device.
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/544,806 US7259529B2 (en) | 2003-02-17 | 2004-02-12 | Charged particle accelerator |
DE112004000137.4T DE112004000137B4 (de) | 2003-02-17 | 2004-02-12 | Verfahren zum Betreiben eines Beschleunigers für geladene Teilchen |
JP2005504978A JP4174508B2 (ja) | 2003-02-17 | 2004-02-12 | 荷電粒子加速器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-037694 | 2003-02-17 | ||
JP2003037694 | 2003-02-17 |
Publications (1)
Publication Number | Publication Date |
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WO2004073364A1 true WO2004073364A1 (ja) | 2004-08-26 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/001470 WO2004073364A1 (ja) | 2003-02-17 | 2004-02-12 | 荷電粒子加速器 |
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US (1) | US7259529B2 (ja) |
JP (1) | JP4174508B2 (ja) |
CN (1) | CN100359993C (ja) |
DE (1) | DE112004000137B4 (ja) |
WO (1) | WO2004073364A1 (ja) |
Cited By (3)
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US7310409B2 (en) | 2005-04-26 | 2007-12-18 | Mitsubishi Denki Kabushiki Kaisha | Electromagnetic wave generator |
JP2009524010A (ja) * | 2006-01-09 | 2009-06-25 | クゥアルコム・インコーポレイテッド | 無線デバイス上で発生するイベントの地理的位置概算のための装置および方法 |
CN112166651A (zh) * | 2018-04-09 | 2021-01-01 | 东芝能源系统株式会社 | 加速器的控制方法、加速器的控制装置以及粒子束治疗系统 |
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- 2004-02-12 WO PCT/JP2004/001470 patent/WO2004073364A1/ja active Application Filing
- 2004-02-12 DE DE112004000137.4T patent/DE112004000137B4/de not_active Expired - Fee Related
- 2004-02-12 US US10/544,806 patent/US7259529B2/en not_active Expired - Fee Related
- 2004-02-12 CN CNB2004800017524A patent/CN100359993C/zh not_active Expired - Fee Related
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JPH01204399A (ja) * | 1988-02-09 | 1989-08-16 | Akihiro Mori | 電子加速器 |
Cited By (4)
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US7310409B2 (en) | 2005-04-26 | 2007-12-18 | Mitsubishi Denki Kabushiki Kaisha | Electromagnetic wave generator |
JP2009524010A (ja) * | 2006-01-09 | 2009-06-25 | クゥアルコム・インコーポレイテッド | 無線デバイス上で発生するイベントの地理的位置概算のための装置および方法 |
CN112166651A (zh) * | 2018-04-09 | 2021-01-01 | 东芝能源系统株式会社 | 加速器的控制方法、加速器的控制装置以及粒子束治疗系统 |
CN112166651B (zh) * | 2018-04-09 | 2023-09-19 | 东芝能源系统株式会社 | 加速器的控制方法、加速器的控制装置以及粒子束治疗系统 |
Also Published As
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CN100359993C (zh) | 2008-01-02 |
US7259529B2 (en) | 2007-08-21 |
DE112004000137B4 (de) | 2015-10-22 |
JPWO2004073364A1 (ja) | 2006-06-01 |
US20060152177A1 (en) | 2006-07-13 |
CN1723744A (zh) | 2006-01-18 |
JP4174508B2 (ja) | 2008-11-05 |
DE112004000137T5 (de) | 2005-12-01 |
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