JP2000068100A - Charged particle beam generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a current value of the extracted charged particle beam and the extracted frequency and widen the range of the selection of the irradiation methods in a charged particle beam generater, having synchrotrons for energizing the deflected electromagnet by using a resonance power source, with circularly accelerating the charged particles by using a plurality of synchrotrons. SOLUTION: A charged particles beam is accelerated and extracted by using a plurality of synchrotrons mounted coaxially along a direction vertical to a rotary face of the charged particles. Here, the deflecting electromagnets 7, 7 mounted on the synchrotrons 3, 3 comprise the specifications common to the upper and lower synchrotrons 3, 3, and the lattices (arrangement of the electromagnets) are also made the same as each another. With such a structure, the current value of the charged particles beam can be increased and the deriving period of the beam can be shortened, so that the irradiation method of the beam can be determined from a wider range of selection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a charged particle beam generator for generating a charged particle beam accelerated by using a synchrotron.

[0002]

2. Description of the Related Art As one of devices for irradiating charged particles accelerated to high energy by a synchrotron, there is a cancer treatment system using protons. FIG. 9 shows the system configuration. The charged particle beam generated by the ion source 1 is accelerated by the injector 2 and is incident on the synchrotron 3. The beam further accelerated by the synchrotron 3 is emitted, passes through the beam transport system 4, is guided to the irradiation device 5, and is irradiated on the target OB.

[0003] The proton synchrotron used in such a system will be described by way of example. FIG. 10 shows KE.
3 shows the K Booster Synchrotron. The charged particles accelerated to some extent by the injector 2 are incident on the synchrotron using the incident electromagnet 6. After that, the charged particles bent using the bending electromagnet 7 orbit. Meanwhile R
Electric energy is obtained from the F cavity 8 and accelerated. The charged particles accelerated to the required energy are emitted by the emission electromagnet 9.

In order for charged particles to orbit stably in a circular orbit in the synchrotron, the charged particle beam must be converged. For this purpose, a quadrupole electromagnet 10 is generally used separately from the bending electromagnet 7. .

FIG. 11 shows the magnetic pole shape of the quadrupole electromagnet 10 for converging the beam and the generated magnetic field in comparison with the case of the deflection electromagnet 7. FIG. FIG. 11B shows the case of the quadrupole electromagnet 10. As shown in FIG. 11A, the core 7a and the coil 7
b, a dipole magnetic field 7c having a shape as shown is formed by the magnetic pole 7d.

On the other hand, as shown in FIG. 11B, in a quadrupole electromagnet 10 composed of an iron core 10a and a coil 10b, a quadrupole magnetic field 10c having a shape as shown in FIG.
Is formed by the magnetic pole 10d.

However, when it is desired to reduce the size of the synchrotron or to simplify the control, the combined use of not only the quadrupole electromagnet 10 but also a quadrupole component as well as a dipole component for deflecting the beam is used instead. The beam is deflected and converged using a type bending electromagnet.

FIG. 12 shows the configuration of a combined bending electromagnet 11 used in a KEK booster synchrotron. As shown in FIG. 11A, the magnetic pole 7d that generates only the dipole component magnetic field 7c has a flat and parallel shape, whereas the magnetic pole 11b of the combined bending electromagnet 11 has a magnetic pole 11b as shown in FIG. Quadrupole magnetic field 11a
Are also inclined so that the

Such a combined type bending electromagnet 11
In the synchrotron using the device, since the quadrupole electromagnet and its power supply are unnecessary, the overall configuration can be reduced in size. In addition, there is an advantage that tracking of a power supply for adjusting the amount of excitation between the deflecting magnet and the quadrupole electromagnet in accordance with the acceleration of the particles is unnecessary, and control is facilitated.

The synchrotron accelerates charged particles that are incident at an operation cycle of several seconds to several tens of seconds by adjusting the magnetic field strength of the bending electromagnet and the accelerating voltage generated in the RF cavity. Usually, this operation is performed repeatedly, and the number of repetitions is called an operation frequency.

Since the magnetic field strength of the bending electromagnet 7 must be changed at high speed during this operation cycle, its excitation pattern is a sine wave, a triangular wave, or a trapezoidal wave. When the operating frequency is increased, it becomes difficult to form a triangular wave or trapezoidal wave pattern, so that a resonance power supply excited by a sine wave is often used. However, the exciting current of the bending electromagnet 7 is determined by the required magnetic field and the shape of the magnet, while the required voltage V is V = ωLI, where ω is the operating frequency, L is the inductance, and I is the current, and is proportional to the operating frequency. .
When ω is large, the voltage becomes large, so even if a resonance power supply is used, the operating frequency is limited.
z is the highest. Generally, the operating frequency of the KEK booster is 20 Hz.

FIG. 13A shows an electric circuit configuration of a power supply in a case where the number of the bending electromagnets 7 is nine. Power is fed from the AC power supply by the choke transformer 12. AC energy is stored by the inductance of the choke transformer and the resonance capacitor 13.

Further, since the charged particle at the time of incidence has a momentum P, it has a finite magnetic field strength from P = eBρ. Therefore, a bias current must be supplied by a DC power supply. The part connected to the DC power supply is connected by an irregular choke transformer 14, but is equivalent to other transformers in terms of AC. FIG. 13B shows the waveform of the resonance power supply.

There are several methods of irradiating a charged particle beam for cancer treatment, and the method currently used is a method of irradiating a beam by enlarging the beam to the shape of a tumor. In the future, as will be described with reference to FIG. 14, a method of irradiating a point-like beam spot 16 as shown in FIG. 14B according to the shape 15 of the tumor shown in FIG. I have. However, it is said that an existing synchrotron using a resonance power source cannot be adopted because the operating frequency is too low to cover the range of the tumor and it takes time.

[0015]

As described above, in the charged particle beam generator, even if an attempt is made to expand the range of selection of the irradiation method, the range of possible operating frequencies is very narrow, so that the irradiation method which can be actually used is There was a problem that the range of selection was extremely limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to enable a wide range of irradiation method selections corresponding to a wider operating frequency. An object of the present invention is to provide a charged particle beam generator.

[0017]

According to the first aspect of the present invention,
A charged particle beam generator having a synchrotron that excites a bending electromagnet using a resonance power supply is characterized in that charged particles are circulated and accelerated using a plurality of the synchrotrons.

With such a configuration, the current value and the extraction frequency of the extracted charged particle beam can be increased by using a plurality of synchrotrons.
The range of selection of the irradiation method can be widened.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, all of the plurality of synchrotrons are operated at the same operation frequency. With such a configuration, in addition to the operation of the invention described in claim 1, by operating at the same operation frequency using a plurality of synchrotrons, a beam can be extracted at a fraction of a cycle. The range of selection of the irradiation method can be further expanded.

According to a third aspect of the present invention, in the first aspect of the present invention, the phases of the respective operation cycles of the plurality of synchrotrons are made different. With this configuration, in addition to the operation of the first aspect of the present invention, the phase of the operating frequency is made different by using a plurality of synchrotrons, so that the beam extraction frequency becomes an integral multiple. The range of selection of the irradiation method can be widened.

According to a fourth aspect of the present invention, in the first aspect of the present invention, all of the plurality of synchrotrons use a common bending electromagnet. With such a configuration, in addition to the operation of the first aspect of the invention, by using a common specification for the bending electromagnet, excitation can be performed with the same power supply, and the system can be simplified.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a common lattice is used by all of the plurality of synchrotrons. With such a configuration, in addition to the operation of the invention described in claim 1, a beam with uniform properties can be extracted by using a common lattice, so that the range of selection of the irradiation method can be further expanded. it can.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the plurality of synchrotrons are installed in a direction perpendicular to the plane of rotation of the particles. With such a configuration, in addition to the operation of the above-described claim 1, the entire installation area can be reduced by installing each synchrotron in a direction perpendicular to the rotation plane of the particles,
The synchrotron building can be downsized.

According to a seventh aspect of the present invention, in the third aspect of the present invention, the synchrotron comprises two units,
It is characterized in that the phase difference between the operation cycles is set to a half cycle.

With this configuration, in addition to the operation of the third aspect of the present invention, the operation cycle of each synchrotron is shifted by a half period by using two synchrotrons, thereby doubling the operation period. Beams can be taken out periodically, and uniform and easy-to-handle beams can be obtained, so that a wider range of irradiation methods can be selected.

The invention according to claim 8 is the invention according to claim 7, wherein the choke inductance of the electromagnet power supply system of the first synchrotron of the two synchrotrons is controlled by the electromagnet of the second synchrotron. Replacing the first
And the second synchrotron is excited by one power supply system.

According to this structure, in addition to the effect of the seventh aspect of the present invention, the inductance of the choke of the power supply of the bending electromagnet is reduced by using two synchrotrons.
By replacing the magnets with synchrotrons and accelerating each synchrotron in opposite phases, it is possible to extract beams at twice the frequency, simplify the power supply configuration, and adjust the phase between the two systems. Is also unnecessary.

According to a ninth aspect of the present invention, in the first aspect of the present invention, a combined bending electromagnet is used for the synchrotron. With such a configuration, in addition to the operation of the first aspect of the present invention, since the bending electromagnet is of a combined type, the beam extraction frequency is increased, and a quadrupole electromagnet is not required, so that the size and control are small. It will be easier.

According to a tenth aspect of the present invention, in the first aspect of the present invention, adjacent synchrotrons share an RF cavity. With such a configuration, in addition to the effect of the first aspect of the present invention, the RF acceleration system can be simplified by sharing the RF cavity between adjacent synchrotrons.

An eleventh aspect of the present invention is characterized in that, in the first aspect of the present invention, the plurality of synchrotrons share an injector. With such a configuration, in addition to the operation of the first aspect of the present invention, the configuration of the entire system can be simplified and the control can be facilitated.

According to a twelfth aspect of the present invention, in the first aspect of the present invention, the plurality of synchrotrons share an input / output device. With such a configuration, in addition to the operation of the invention described in claim 1, the configuration of the system can be simplified by sharing the input / output devices of the respective synchrotrons.

According to a thirteenth aspect of the present invention, in the first aspect of the present invention, the irradiation apparatus is shared with a transport system through which a beam passes after the plurality of synchrotrons emit light.

With such a configuration, in addition to the operation of the first aspect of the present invention, the system of the irradiation apparatus can be simplified by sharing the irradiation apparatus with the respective beam transport systems, and the irradiation time can be reduced. The extraction frequency of the charged particle beam can be increased.

According to a fourteenth aspect of the present invention, in the first aspect of the present invention, at least a part of the plurality of synchrotrons is set such that a phase difference between at least a part of the operation cycles is equal, and the operation cycles of the plurality of synchrotrons are equal. The synchrotron with the phase difference set is characterized by sharing the irradiation system with the transport system through which the beam passes after emission. With such a configuration,
In addition to the effect of the first aspect of the invention, the system configuration of the irradiation device can be simplified.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. (First Embodiment) FIG. 1 shows the configuration of a synchrotron according to a first embodiment of the present invention. The configuration of each synchrotron itself is the same as that shown in FIGS. Since they are almost the same, the same portions are denoted by the same reference numerals and description thereof will be omitted.

It is assumed that the charged particle beam is accelerated and extracted by using a plurality of, for example, two synchrotrons 3, 3 coaxially arranged along the direction perpendicular to the rotational plane of the charged particles. At this time, the bending electromagnets 7, 7 installed in the synchrotrons 3, 3 have the same specifications for the upper and lower synchrotrons 3, 3, and the lattices (electromagnet arrangement) are also the same.

With the above configuration, the charged particles are accelerated by using a plurality of, for example, two synchrotrons 3, 3, so that the current value of the charged particle beam is increased and the beam extraction cycle is shortened. Therefore, the irradiation method of the beam can be obtained from a wider range of options.

Further, by using a common bending electromagnet specification, excitation by the same power supply becomes possible, and the system configuration can be simplified. Furthermore, the above-mentioned synchrotron 3,
Since a common lattice is used in Step 3, a beam with uniform properties can be obtained, and the range of irradiation method selection can be further expanded.

Further, by installing the respective synchrotrons 3 and 3 coaxially in the direction perpendicular to the plane of rotation of the particles, the entire installation area can be reduced, and the building of the synchrotrons 3 and 3 can be downsized. Can be.

(Second Embodiment) FIG. 2A shows an excitation pattern of an electromagnet according to a second embodiment of the present invention. The basic configuration of a synchrotron is shown in FIG. Therefore, the same parts are denoted by the same reference numerals, and their illustration and description are omitted.

As shown in the figure, the charged particles are excited by a sine wave, and the charged particles are accelerated at a portion where the slope is positive after being incident at the timing T1, and are emitted near the peak value when emitted at the maximum energy. Emitted at T2.

As shown in FIG. 2 (b), a plurality of
When the three synchrotrons 3, 3,... Are operated at the same operation frequency, the beam extraction frequency is quadrupled, and an easy-to-use beam with uniform beam intervals can be supplied. Therefore, the irradiation method can be more widely selected and a stable beam can be supplied.

A plurality of synchrotrons 3, 3,...
By making the phases of the operating frequencies different, the beam extraction frequency becomes an integral multiple, so that the range of selection of the irradiation method can be further expanded.

(Third Embodiment) FIG. 3A shows a resonance power supply for an electromagnet according to a third embodiment of the present invention. The basic configuration of the synchrotron itself is shown in FIG. Therefore, the same parts are denoted by the same reference numerals and their illustration and description are omitted.

By replacing the inductance used in the choke transformer 12 of FIG. 3A with the inductances 20, 20,.
The circuit becomes as shown in FIG.
The phases of the currents 7,... Are opposite to each other. A choke transformer 12 is newly installed to feed the alternating current. DC feed capacitors 21 and 21 are used to feed DC.
Is installed.

By replacing the inductance of the choke of the resonance power supply with the inductance of the second synchrotron 3, it is possible to extract a beam with a half cycle,
The circuit configuration of the power supply can be simplified, and phase adjustment between the two systems is not required.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention.
It shows the configuration of the synchrotron according to the embodiment, which is basically the same as the case shown in FIG. 1, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

Thus, as shown in the figure, the bending electromagnets (7, 7) of the two synchrotrons 3, 3 are combined bending electromagnets 11, 11, and no quadrupole electromagnet is installed except for correction.

The use of the combined type bending electromagnets 11 increases the beam extraction frequency,
As described above, since the quadrupole electromagnet is not required, the device is small and easy to control.

(Fifth Embodiment) FIG. 5A shows a configuration of a synchrotron according to a fifth embodiment of the present invention, which is basically the same as that shown in FIG. Therefore, the same portions have the same reference characters allotted, and description thereof will not be repeated.

It is assumed that the RF cavities 8 'of the two synchrotrons 3 and 3 are shared, and that the phases of the operating frequencies of the two synchrotrons 3 and 3 are different by 180 degrees.

The RF cavity 8 ′ has two beam ducts 81, between ferrites 80, as shown in FIG.
Electric energy is given to charged particles passing through the cavity by the magnetic field generated in the ferrite 80 through the ferrite 80, and the ferrite 80 is installed so as to surround the beam ducts 81 of the two synchrotrons as shown in the figure.

The phase of the two synchrotrons 3, 3 is 18
If they differ by 0 degrees, after the charged particles accelerated by the first synchrotron 3 are emitted, the charged particles are incident on the second synchrotron 3 and charged by the respective synchrotrons 3. Since the particles do not pass through the RF cavity 8 'at the same time, the above-described structure is feasible. By sharing the RF cavity 8 ',
Only one control system for the RF cavity 8 'is required, and the RF acceleration system can be simplified and downsized.

(Sixth Embodiment) FIG. 6 shows a sixth embodiment of the present invention.
This shows the configuration of the synchrotron according to the present embodiment, which is basically the same as that shown in FIG. 4 above. Therefore, the same parts will be denoted by the same reference numerals and description thereof will be omitted.

The two synchrotrons 3 and 3 share the ion source 1 and the injector 2, and the two
The charged particle beam is distributed to two synchrotrons 3 and 3. By sharing the injector 2, only one control and maintenance is required, and the configuration of the apparatus is reduced.

(Seventh Embodiment) FIG. 7 shows a seventh embodiment of the present invention.
This shows the side configuration of the synchrotron according to the embodiment, and the configuration of the synchrotron itself is basically the same as that shown in FIG. 6 above. It shall be omitted.

Thus, the two synchrotrons 3 and 3 share the input electromagnet 6 and the output electromagnet 9, and the beam of charged particles is assumed to enter and exit from the horizontal direction. When the beam is incident, the charged particles on the incident trajectory 84 by being bent by the incident electromagnet 6 are distributed by the electromagnet 82.
At a, they are distributed to the two synchrotrons 3 and 3 and are bent by the kicker electromagnets 83a and 83a, respectively, to get on the orbits 85 and 85. After that, orbit 85,
85, and kicker electromagnet 8
The beams are bent from the orbits 85 and 85 at 3b and 83b, and are bent by the distribution electromagnets 82b to ride on the emission orbit 86 and are emitted by the emission electromagnet 9.

As described above, by sharing the input / output device of a plurality of synchrotrons, only one device is required, so that control and maintenance are easy, and the configuration of the device can be downsized.

(Eighth Embodiment) FIG. 8 shows an eighth embodiment of the present invention.
This shows the configuration of the synchrotron according to the present embodiment, which is basically the same as that shown in FIG. 6, so that the same parts are denoted by the same reference numerals and description thereof will be omitted.

It is assumed that the two synchrotrons 3 and 3 share the irradiation device 5 by the distribution electromagnet 82, and that the phase difference between the operation cycles of the two synchrotrons 3 and 3 is equal, in this case, 180 degrees. Set so that

As described above, by sharing the irradiation device 5, the system of the irradiation device 5 can be simplified and the extraction frequency of the charged particle beam at the time of irradiation can be doubled.

Further, by providing the above-described phase difference, the irradiation devices 5 can be shared without causing the passage timings of the charged particle beams in the irradiation devices 5 to coincide with each other. It should be noted that the present invention is not limited to the above-described first to eighth embodiments, and can be variously modified and implemented without departing from the gist thereof.

[0063]

According to the first aspect of the present invention, by using a plurality of synchrotrons, it is possible to increase the current value and the extraction frequency of the extracted charged particle beam. Can be expanded.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, by operating a plurality of synchrotrons at the same operation frequency, the beam is emitted at a fractional period. Can be taken out, so that the range of selection of the irradiation method can be further expanded.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the phase of the operating frequency is made different by using a plurality of synchrotrons, so that the beam extraction frequency becomes an integral multiple. Therefore, the range of selection of the irradiation method can be further expanded.

According to the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, by using a common bending electromagnet, excitation can be performed with the same power supply, and the system can be simplified. .

According to the fifth aspect of the present invention, in addition to the effect of the first aspect of the present invention, a beam having uniform properties can be obtained by using a common lattice. The width can be expanded.

According to the sixth aspect of the present invention, in addition to the effect of the first aspect of the present invention, the total installation area can be reduced by installing each synchrotron in a direction perpendicular to the plane of rotation of the particles. The synchrotron building can be downsized.

According to the seventh aspect of the invention, in addition to the effect of the third aspect of the invention, the operation cycle of each synchrotron is shifted by a half cycle by using two synchrotrons, thereby achieving a 2 Beams can be taken out at twice the frequency, and uniform and easy-to-handle beams can be obtained, so that the range of choice of irradiation method can be further expanded.

According to the eighth aspect of the invention, in addition to the effect of the seventh aspect of the present invention, the inductance of the choke of the bending electromagnet power supply is replaced by the electromagnet of the second synchrotron using two synchrotrons. However, by accelerating the respective synchrotrons in opposite phases, it is possible to extract a beam at twice the frequency, simplify the configuration of the power supply, and eliminate the need for phase adjustment between the two systems.

According to the ninth aspect of the present invention, in addition to the effect of the first aspect of the present invention, by using a combined type of bending electromagnet, the beam extraction frequency is increased and a quadrupole electromagnet is not required. Therefore, it is small and easy to control.

According to the tenth aspect, in addition to the effect of the first aspect, the RF acceleration system can be simplified by sharing the RF cavity between adjacent synchrotrons.

According to the eleventh aspect of the present invention, in addition to the effects of the first aspect of the present invention, the configuration of the entire system can be simplified and the control can be facilitated. According to the twelfth aspect, in addition to the effect of the first aspect, the configuration of the system can be simplified by sharing the input / output devices of the respective synchrotrons.

According to the thirteenth aspect of the present invention, in addition to the effects of the first aspect of the present invention, the system of the irradiation apparatus can be simplified by sharing the irradiation apparatus with each beam transport system, and the irradiation can be simplified. The extraction frequency of the charged particle beam at the time can be increased. According to the fourteenth aspect, in addition to the effect of the first aspect, the system configuration of the irradiation apparatus can be simplified.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram according to a first embodiment.

FIG. 2 is a conceptual diagram according to a second embodiment.

FIG. 3 is a conceptual diagram according to a third embodiment.

FIG. 4 is a conceptual diagram according to a fourth embodiment.

FIG. 5 is a conceptual diagram according to a fifth embodiment.

FIG. 6 is a conceptual diagram according to a sixth embodiment.

FIG. 7 is a conceptual diagram according to a seventh embodiment.

FIG. 8 is a conceptual diagram according to an eighth embodiment.

FIG. 9 is a conceptual diagram of a conventional beam irradiation apparatus for cancer treatment.

FIG. 10 is a conceptual diagram of a conventional synchrotron.

FIG. 11 is a sectional view of a conventional bending electromagnet and a quadrupole electromagnet.

FIG. 12 is a cross-sectional view of a conventional combined bending electromagnet.

FIG. 13 is a schematic diagram of an electric circuit of an electromagnet installed in a conventional synchrotron.

FIG. 14 is a conceptual diagram of a desired beam irradiation method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ion source 2 ... Injector 3 ... Synchrotron 4 ... Beam transport system 5 ... Irradiation device 6 ... Injection electromagnet 7 ... Bending electromagnet 8, 8 '... RF cavity 9 ... Emission electromagnet 10 ... Quadrupole electromagnet 11 ... Combined type Bending electromagnet 12 Choke transformer 13 Resonant capacitor 14 Choke transformer for DC power supply connection 15 Tumor shape 16 Beam spot 20 Electromagnet inductance 21 DC blocking capacitor 80 Ferrite 81 Beam duct 82 Distributing electromagnet 83 Kicker magnet 84 ... incident orbit 85 ... circular orbit 86 ... outgoing orbit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G085 AA13 AA18 BA02 BA14 BA15 BA19 CA17 CA18 EA07 4C082 AA01 AC05 AE01 AG01 AG02 AG03 AG60 AT01

Claims (14)

[Claims] 1. A charged particle beam generator having a synchrotron that excites a bending electromagnet using a resonance power supply, wherein a plurality of the synchrotrons are used to orbit charged particles.
A charged particle beam generator characterized by being accelerated. 2. The charged particle beam generator according to claim 1, wherein all of the plurality of synchrotrons are operated at the same operation frequency. 3. The charged particle beam generator according to claim 1, wherein the phases of each operation cycle of said plurality of synchrotrons are made different. 4. The charged particle beam generator according to claim 1, wherein a bending electromagnet having a common specification is used in all of the plurality of synchrotrons. 5. The charged particle beam generator according to claim 1, wherein a common lattice is used by all of the plurality of synchrotrons. 6. The charged particle beam generator according to claim 1, wherein the plurality of synchrotrons are installed in a direction perpendicular to the plane of rotation of the particles. 7. The charged particle beam generator according to claim 3, wherein said synchrotron comprises two units, and a phase difference between their operation periods is set to a half period. 8. An inductance of a choke of an electromagnet power supply system of a first synchrotron of the two synchrotrons is replaced by an electromagnet of a second synchrotron, and the first and second synchrotrons are replaced by one. The charged particle beam generator according to claim 7, wherein the excitation is performed by a power supply system. 9. The charged particle beam generator according to claim 1, wherein a combined bending electromagnet is used for the synchrotron. 10. The charged particle beam generator according to claim 1, wherein an RF cavity is shared by adjacent synchrotrons. 11. The charged particle beam generator according to claim 1, wherein said plurality of synchrotrons share an injector. 12. The charged particle beam generator according to claim 1, wherein the input / output device is shared by the plurality of synchrotrons. 13. The charged particle beam generator according to claim 1, wherein the irradiation apparatus is shared with a transport system through which the beam passes after being emitted by the plurality of synchrotrons. 14. The synchrotron in which at least a part of the operation cycles of the plurality of synchrotrons are set so that the phase differences of the operation cycles are at equal intervals, and for the synchrotron in which the phase differences of the operation cycles are set, the transport through which the beam passes after emission. 2. The charged particle beam generator according to claim 1, wherein the irradiation unit is shared with the system.