WO2006008838A1 - 周回軌道型荷電粒子加速器及びその加速方法 - Google Patents
周回軌道型荷電粒子加速器及びその加速方法 Download PDFInfo
- Publication number
- WO2006008838A1 WO2006008838A1 PCT/JP2004/015988 JP2004015988W WO2006008838A1 WO 2006008838 A1 WO2006008838 A1 WO 2006008838A1 JP 2004015988 W JP2004015988 W JP 2004015988W WO 2006008838 A1 WO2006008838 A1 WO 2006008838A1
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- WO
- WIPO (PCT)
- Prior art keywords
- acceleration
- frequency
- voltage
- amplitude
- frequency voltage
- Prior art date
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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
- H05H13/04—Synchrotrons
Definitions
- the present invention relates to a charged particle accelerator, and more particularly to an orbiting charged particle accelerator and an acceleration method thereof.
- the charged particle accelerators currently operating in the world can be roughly classified into high-frequency accelerators and DC high-pressure accelerators according to their acceleration methods. Moreover, it can be classified into a linear accelerator and a circular accelerator. Circular accelerators can be further classified into circular orbit type and spiral orbit type according to the orbit of particles. Furthermore, the structure differs depending on whether the acceleration frequency is modulated or not.
- the present invention relates to an orbiting charged particle accelerator, that is, an ion synchrotron.
- charged particles orbit around a fixed orbit 11.
- 12 is a deflecting magnet for maintaining charged particles on a fixed orbit
- 13 is a high-frequency acceleration cavity for accelerating charged particles by applying a high-frequency electric field.
- O is the orbital center of particle orbit 11 and R is the average radius of particle orbit 11 or the average orbit radius.
- Equation (1) holds for the average magnetic flux density B on the particle orbit.
- e is the charge of the ion (Coulomb)
- c is the speed of light (approximately 3 X 10 8 mZ seconds)
- B is the average magnetic flux density in the orbit (Tesla)
- m is the static mass of the ion (kg) .
- R is the average orbit radius (m), and when the length of one revolution of the particle orbit is L,
- ⁇ is the pi
- m is the ion mass (kg)
- V is the ion velocity (mZ seconds).
- the mass m differs from the static mass m, and changes with the velocity as shown in equation (4).
- 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 frequency period (T) to the particle rotation period (T) is
- N T / T (6)
- the frequency of the acceleration high frequency is modulated so that the rotation period (T) maintains this relationship.
- phase of the accelerated particles is maintained in a fixed relationship with the phase of the accelerated high-frequency voltage.
- the acceleration cavity for accelerating the particles with a force is part of a high-frequency resonance circuit as shown in FIG. Fig. 3 (a) shows a cross section of the acceleration cavity, and Fig. 3 (b) is a lumped constant circuit representation of the acceleration cavity shown in (a).
- the acceleration cavity is formed by arranging a pair of conductor portions composed of an inner conductor 31 and an outer conductor 32 with an acceleration gap 33 therebetween.
- the inner and outer conductors 31 and 32 provide resistance r and inductance L
- the acceleration gap 33 provides capacitance C. That is, the accelerating cavity constitutes a resonance circuit having a resistance!: And an inductance capacitance C.
- a magnetic material such as ferrite (ring-shaped ferrite 51) is put in, and the resonance frequency itself is changed by changing the magnetic permeability of this magnetic material.
- the magnetic permeability of the magnetic material is changed by winding a coil around the magnetic material and changing the current (bias current 53 from the bias power source 52) that flows through the coil. This utilizes the fact that the magnetic permeability of the magnetic material is changed by an external magnetic field (see Non-Patent Document 1).
- the method described above is a method that was adopted at the beginning of synchrotron development, but is very complicated. Therefore, it is conceivable to increase the resonance width of the resonant circuit by using a magnetic material with a large loss (dotted line in Fig. 4). In other words, the resonance circuit is not tuned by widening the resonance width. However, this method is inversely proportional to increasing the resonance width and has the disadvantage of increasing power loss for generating the required voltage.
- Non-Patent Document 1 Co-authored by Kamei Kei and Motoki Kihara, “Parity Physics Course Accelerator Science” Maruzen Co., Ltd., September 20, 1993 P. 62
- the present invention eliminates the complicated structure for changing the frequency of the acceleration high-frequency voltage, and provides a novel orbiting charged particle accelerator and acceleration method for reducing a large power loss. Objective.
- the frequency of the acceleration high-frequency voltage is fixed, and the amplitude of the acceleration high-frequency voltage is modulated so that the harmonic number, which is the ratio of the rotation period of the charged particles to the acceleration high-frequency period, changes as an integer.
- An orbiting charged particle accelerator with a circuit is provided
- the amplitude modulation circuit modulates the amplitude of the high-frequency voltage signal, and an arbitrary waveform generator that generates a voltage modulation waveform that satisfies an acceleration condition such that the harmonic number changes as an integer.
- An amplitude modulator an amplifier that amplifies the modulated high-frequency voltage signal and supplies it to the acceleration cavity of the accelerator, a voltage detector that detects the high-frequency voltage generated in the acceleration cavity, and a waveform of the detected high-frequency voltage It is preferable to provide an operational amplifier that compares the voltage modulation waveform and controls the amplitude modulator so that both waveforms are equal. That's right.
- the frequency of the acceleration high-frequency voltage is fixed, and the harmonic number that is the ratio of the rotation period of the charged particles to the acceleration high-frequency period is an integer.
- An acceleration method is provided that modulates the amplitude of the accelerating radio frequency voltage to vary.
- the present invention it is preferable to modulate the amplitude of the acceleration high-frequency voltage so that the harmonic number decreases in integer units as the rotation period of the charged particles becomes shorter.
- the present invention a complicated structure or magnetic material for changing the resonance frequency of the accelerating cavity is not required.
- the Q value of the accelerating cavity that is, the quality factor increases, and the power loss for acceleration can be greatly reduced.
- the acceleration voltage can be increased as much as the loss is reduced, and the acceleration beam extraction cycle can be significantly shortened.
- the basic principle of the present invention is a method in which the harmonic number N is decreased by an integer unit instead of modulating the frequency of the accelerating high frequency every time the accelerating particle makes one rotation. (7)
- This is a method of modulating the amplitude of the acceleration voltage so that Where ⁇ is the acceleration particle per revolution
- k is an arbitrary integer.
- the acceleration voltage is fixed so that the phase of the acceleration particles jumps by 2 ⁇ from the phase of the high frequency. Modulated. In other words, each time the accelerated particle makes one revolution, that is, one revolution period, the harmonic number ⁇ decreases from 7 to 4, one at a time.
- FIG. 6 simply shows the basic principle of the present invention, and the actual harmonic number is much larger and larger as described in the embodiments described later.
- the amplitude of the acceleration voltage is modulated so as to satisfy the relationship of Equation (7), so that the particle rotation period T linearly increases as the particle rotation speed increases. Decrease
- the harmonic number N upon incidence is 2000.
- Particle rotation period T is the number of particle rotations
- the high-frequency signal generated by the signal generator 91 is modulated by the amplitude modulator 92, amplified to the required power by the front stage amplifier 93 and the final stage amplifier 94, and accelerated through the impedance change 95. Supplied to 96.
- the arbitrary waveform generator 97 generates a voltage modulation waveform that satisfies the acceleration condition described above.
- the high-frequency acceleration voltage generated in the acceleration cavity 96 is detected by a voltage pickup 97 and a rectifier 98 Converted to pressure.
- the arbitrary waveform of the arbitrary waveform generator 97 and the rectified acceleration voltage waveform are sent to the differential amplifier 99 for comparison.
- the differential amplifier 99 controls the amplitude modulator 92 so that the acceleration voltage waveform becomes equal to the arbitrary waveform.
- the high frequency signal from the voltage pickup 97 is divided and transmitted to the oscilloscope 101 by the signal divider 100 and directly observed.
- the voltage pickup 97 constitutes the voltage detector of the present invention.
- FIG. 1 A simple plan view of an ion synchrotron and a diagram showing an accelerated particle orbit.
- FIG. 2 is a diagram showing the relationship between the acceleration high-frequency period and the particle rotation period of the ion synchrotron.
- FIG. 3 (a) is a cross-sectional view of the acceleration cavity, and (b) is a diagram showing a lumped constant circuit display of the acceleration cavity of (a).
- FIG. 4 is a diagram showing frequency characteristics of voltage gain of a resonance circuit.
- FIG. 5 is a diagram showing an example of a conventional acceleration cavity resonance frequency variable method of an ion synchrotron.
- FIG. 6 is a diagram showing the acceleration principle of the present invention.
- FIG. 7 is a diagram showing the relationship between particle rotation speed and particle rotation period.
- FIG. 8 is a diagram showing an example of temporal changes in the magnetic field (Gauss), acceleration voltage (kV), and particle energy (MeVZ nucleon) in the present invention when using an ion synchrotron magnetic field.
- FIG. 9 is a diagram showing an example of an acceleration cavity amplitude modulation circuit according to the present invention.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-213128 | 2004-07-21 | ||
JP2004213128A JP4104007B2 (ja) | 2004-07-21 | 2004-07-21 | 周回軌道型荷電粒子加速器及びその加速方法 |
Publications (1)
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WO2006008838A1 true WO2006008838A1 (ja) | 2006-01-26 |
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PCT/JP2004/015988 WO2006008838A1 (ja) | 2004-07-21 | 2004-10-28 | 周回軌道型荷電粒子加速器及びその加速方法 |
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JP (1) | JP4104007B2 (ja) |
WO (1) | WO2006008838A1 (ja) |
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 |
-
2004
- 2004-07-21 JP JP2004213128A patent/JP4104007B2/ja not_active Expired - Fee Related
- 2004-10-28 WO PCT/JP2004/015988 patent/WO2006008838A1/ja active Application Filing
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 |
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JP2006032281A (ja) | 2006-02-02 |
JP4104007B2 (ja) | 2008-06-18 |
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