JP2856126B2 - Ion beam accelerator and circular accelerator using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ion beam accelerator for applying energy to charged particles, and more particularly to an ion beam accelerator suitable for use in an accelerator for medical or physical experiments and a circular accelerator using the same. .

[0002]

2. Description of the Related Art First, the types of acceleration cavities used for ion acceleration will be described. Ions have a small relativistic effect because the mass of the lightest proton is about 2000 times as heavy as the electron mass. Therefore, the ion velocity is generally low, and the ion velocity changes greatly during acceleration. Therefore,
To accelerate this to the desired energy, a magnetic material is loaded into the acceleration cavity, and the resonance frequency of the acceleration cavity is greatly reduced by the magnetic permeability of the magnetic material. A magnetic material-loaded acceleration cavity that accelerates ions by matching the resonance frequency of the cavity is used. For this magnetic material-loaded acceleration cavity, use a magnetic material with low magnetic loss,
By applying a bias magnetic field to the magnetic material by a bias current, the permeability of the magnetic material is controlled to change the resonance frequency of the acceleration cavity so as to be tuned to the orbital frequency of the ions. By using a large magnetic material, the cavity voltage is low, but the loss of the magnetic material widens the resonance frequency beyond the range of all the circulating frequencies necessary to accelerate ions, so that a bias device is unnecessary. There are two types: an untuned accelerating cavity that is easy to control.

[0003] Examples of the prior art relating to the accelerating cavity and its power supply method are described in High Energy Accelerator Seminar OHO '89, "High Frequency Accelerator for Proton Synchrotron", pp. V-19 to V-.
30.

Next, FIG. 10 shows a conventional non-tuning type acceleration cavity 3.

The accelerating cavity 3 includes an accelerating cavity outer conductor 10 and an accelerating cavity outer conductor 10A, through which the ion beam 60 passes and passes through the side wall of the accelerating cavity outer conductor 10.
The accelerating cavity conductor 11A provided inside the accelerating cavity conductor 11B and the accelerating cavity conductor 11A provided on the other side wall in the same manner as 11A.
, And a gap 12 formed between the accelerating cavity conductor 11A and the accelerating cavity conductor 11B. Accelerator cavity conductor 11A
And 11B are connected to the vacuum duct of the circular accelerator.

The high-frequency power output from the high-frequency power generator 30 is applied between the accelerating cavity inner conductor 11A and the accelerating cavity outer conductor 10 having a coaxial structure. This power supply method is called direct coupling or direct power supply. With this direct power supply,
A high-frequency current 41 is generated between the accelerating cavity inner conductor 11A and the accelerating cavity outer conductor 10.

The high-frequency current 41 generates a high-frequency magnetic field 42 in the annular magnetic body 20, and an acceleration voltage for accelerating ions is generated in the gap 12.

The accelerating cavity described in JP-A-63-76299 has the same power supply structure as the conventional accelerating cavity 3 shown in FIG.

[0009]

The inventors have studied in detail the characteristics of the conventional acceleration cavity 3 shown in FIG. 10 and the characteristics of Japanese Patent Application Laid-Open No. 63-76299. As a result, the inventors have discovered a new problem that the efficiency of using high-frequency power is low in these conventional acceleration cavities. The present invention has been made to solve this new problem.

A first object of the present invention is to provide an ion beam accelerator which has a high efficiency of using high frequency power and can be downsized, and a circular accelerator using the same.

A second object of the present invention is to provide an ion beam accelerator capable of generating a higher accelerating voltage and a circular accelerator using the same .

[0012]

According to a first aspect of the present invention, there is provided an ion beam accelerating apparatus comprising:
High-frequency power generation means and high-frequency power generation means
And a magnetic branch for each high-frequency power
And a plurality of high-frequency powers branched by the branching device.
Multiple transmissions that amplify each high-frequency power and transmit to each magnetic body
Sending means.

According to a second aspect of the present invention for achieving the first object, an ion beam accelerator comprises a single high-frequency power generator.
Stage and a plurality of high-frequency powers generated by the high-frequency power generation means.
And a branching device for each magnetic material group.
The high-frequency power branched by the
Multiple transmitters that amplify each wave power and transmit to each group
And a step.

According to a third aspect of the present invention for achieving the second object, in the first or second aspect , the amplified signal is amplified by the transmission means.
The generated high-frequency power generates a magnetic field in the same direction in all the magnetic bodies.

[0015]

A fourth invention for achieving the second object.
, In any one of the first to third invention, the magnetic body is annular, accelerating cavity inner conductor has penetrates the magnetic body of the annular.

[0017]

[0018]

[0019]

[0020]

According to the first invention, a plurality of high frequency powers are
Multiple transmissions that amplify each high-frequency power and transmit to each magnetic body
Providing the transmitting means improves impedance mismatch between the transmitting means and the accelerating cavity, so that reflected power is reduced and high-frequency power utilization efficiency is increased. Also one high
Frequency power generating means, and the high frequency generated by the high frequency power generating means.
A branching device that branches the frequency power into a plurality of
High frequency power is amplified for each high frequency power and transmitted to each magnetic body
And a plurality of transmission means to reduce the output.
High-frequency power generation means, branching power with small power capacity, power
It is possible to use an amplifier of transmission means with a small capacity.
Means for supplying high-frequency power can be miniaturized,
The beam acceleration device can be downsized.

According to the second invention, a plurality of high frequency powers are
A plurality of signals that are amplified for each high-frequency power and transmitted to each group
By providing the transmission means, the impedance mismatch between the transmission means and the acceleration cavity is improved, so that the reflected power is reduced and the efficiency of using the high-frequency power is increased. Also one
High-frequency power generation means and high-frequency power generation means
A branching device for branching high-frequency power into a plurality, and a plurality of branched devices
RF power is amplified for each RF power and
By providing a plurality of transmission means for transmitting,
Small high-frequency power generation means, small branching power,
It is possible to use an amplifier of transmission means with small power capacity.
Therefore, the means for supplying high-frequency power can be reduced in size,
The beam accelerator can be downsized.

According to the third aspect, the signal is amplified by the transmission means.
Since the high-frequency power generates a magnetic field in the same direction in all magnetic bodies, a large high-frequency magnetic field can be generated inside the magnetic bodies, and is supplied into the acceleration cavity via the high-frequency magnetic field. High frequency power is increased and higher accelerating voltage is obtained.

[0024]

According to the fourth aspect , the magnetic body is annular, and the conductor in the acceleration cavity penetrates the annular magnetic body, so that a large high-frequency magnetic field is generated inside the magnetic body,
High power is supplied into the acceleration cavity via the high-frequency magnetic field, and a high acceleration voltage is obtained.

[0026]

[0027]

[0028]

[0029]

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a conventional acceleration cavity 3 shown in FIG. 10, an acceleration voltage V generated in a gap 12 is:

[0031]

(Equation 1)

Is given by Where P is the power in the cavity,
Z is the impedance of the cavity.

The impedance Z of the accelerating cavity 3 is, when substantially equal to the impedance Z _d of the magnetic body, a gap 12
Accelerating voltage V _d generated in, using Z _d,

[0034]

(Equation 2)

Is given by

Also, P is

[0037]

(Equation 3)

(However, assuming that Z is substantially a pure resistance, when Z> Z ₀ , Γ = (Z−Z ₀ ) / (Z + Z ₀ ) When Z <Z ₀ , Γ = (Z ₀ −Z) / (Z ₀ + Z)). Here, Γ is the voltage reflection coefficient, Z ₀ is the characteristic impedance of the transmission line (= 50Ω), and P _g is the output power of the high frequency source.

The impedance Z _{d of the} magnetic material loaded in the acceleration cavity 3 is generally large, and the impedance Z of the acceleration cavity 3 is substantially determined by this. Therefore, the impedance Z _{0 of the} transmission path for transmitting power and the impedance Z of the acceleration cavity 3 are Z = Z _d ≫Z ₀ , and an impedance mismatch occurs. The power P in the cavity is, for example, Z =
If 1 kΩ, the output power P of the high-frequency power generator 30
_g of 20% or less. The remaining power is reflected by the high-frequency power generator 30 and consumed there. Therefore, the utilization efficiency of the high frequency power is low.

The accelerating cavity disclosed in JP-A-63-76299 can be said to be the same as the conventional accelerating cavity 3 shown in FIG.

The present inventors have succeeded in increasing the utilization efficiency of the high-frequency power by supplying the high-frequency power to each magnetic substance loaded in the acceleration cavity or to each group of the magnetic substances.

This specific example will be described below.

Embodiment 1 An ion beam accelerator according to a first embodiment of the present invention will be described with reference to FIG.

The ion beam accelerator of this embodiment has an acceleration cavity 2 loaded with n annular magnetic bodies 20 and n high-frequency power supply devices 35.

The accelerating cavity 2 is a non-tuned accelerating cavity. The accelerating cavity outer conductor 10, the accelerating inner conductors 11C and 11D through which the ion beam 60 passes, and the accelerating cavity 10 are accelerated. It has an annular magnetic body 20 arranged to surround the in-cavity conductors 11C and 11D, respectively. Each annular magnetic body 2
0 all have the same magnetic permeability. One annular magnetic body 20
Is Z _d / n.

The accelerating cavity conductors 11C and 11D pass through different side walls of the accelerating cavity conductor 10 and face each other.
The gap 12 is composed of the accelerating cavity conductor 11C and the accelerating cavity conductor.
11D. This gap 12 is arranged at the center of the accelerating outer conductor 10 in the traveling direction of the ion beam 60.

The side walls 25 and 26 of the external conductor 10 are connected to the internal conductors 11C and 11D.

The high frequency power supply device 35 is
There are provided n power transmission paths 34 provided for each 0, and a winding part 33 connected to the power transmission paths 34 to generate a high-frequency magnetic field in the annular magnetic body 20. The power transmission line 34 includes a high-frequency power generator 30A that generates high-frequency power, an amplifier 32 connected to an output side of the high-frequency power generator 30A, and a coaxial cable 14 connected to an output of the amplifier 32.

The inner conductor 15 of the coaxial cable 14 is wound around the annular magnetic body 20 in a one-to-one relationship to form a winding part 33. The tip of the inner conductor 15 is connected to the inner wall of the outer conductor of the acceleration cavity 10. In a portion where the internal conductor 15 penetrates the external acceleration cavity conductor 10, an electric insulator 27 is provided between the internal conductor 15 and the external acceleration cavity conductor 10. Outer conductor 16
Are connected to the outer wall of the accelerating cavity outer conductor 10.

The high frequency power generated by the high frequency power generator 30A is amplified by the amplifier 32. The amplified high-frequency power is transmitted to the annular magnetic body 20 via the coaxial cable 14.

Since the inner conductor 15 is wound around the annular magnetic body 20, a high-frequency current flowing through the inner conductor 15 generates a high-frequency magnetic field 42 inside the annular magnetic body 20. High-frequency power is supplied to the acceleration cavity 2 by these high-frequency magnetic fields 42, and an acceleration voltage is generated in the gap 12. When the ion beam 60 passes through the gap 12,
It is accelerated by the accelerating voltage.

FIG. 2A shows an equivalent circuit of the accelerating cavity as viewed from the high-frequency power supply device 35.

In this embodiment, the n annular magnetic members 2
Since the high-frequency power is supplied to the acceleration cavity 2 via the zero, the high-frequency power generator 30 and the acceleration cavity 2 can be said to be an inductive coupling utilizing the inductance of the annular magnetic body 20.

Further, when the equivalent circuit of FIG. 2A is represented by a sub-circuit of n annular magnetic bodies 20, it becomes as shown in FIG. 2B.

The impedance Z _n of the acceleration cavity 2 connected to one power transmission line 34 is equivalent to the impedance Z _d / n of one annular magnetic body 20. Therefore, it can be said that the acceleration cavity 2 having the n annular magnetic bodies 20 of the present embodiment is formed by connecting n acceleration cavities having an impedance Z _d / n in series.

Assuming that the high-frequency power transmitted by one coaxial cable 14 is P _g / n, the acceleration voltage V _n generated in the gap 12 is

[0057]

(Equation 4)

Is given by

Therefore, the accelerating cavity 2 of the present embodiment can generate a voltage Δn times that of the directly coupled accelerating cavity.

Incidentally, in an accelerating cavity to which high-frequency power is supplied by direct coupling, there is one power transmission path, and the impedance Z of the accelerating cavity is the impedance Z _d of n magnetic bodies.

On the other hand, in this embodiment, the load impedance Z in one of the n power transmission lines 34 is
_n is the impedance Z _d / n of one annular magnetic body 20
It is.

That is, in this embodiment, the power transmission line 34
, The load impedance Z _n decreases and approaches the characteristic impedance Z ₀ of the power transmission line 34.

Accordingly, the impedance mismatch between the power transmission line 34 and the load is improved, and the reflected power is reduced. In the high-frequency power supply device 35, the high-frequency power supplied to the inside of the acceleration cavity 2 increases, and the reflected power, which is useless power, decreases. Therefore, the high-frequency power generator 30
, The consumption of the reflected power is reduced, and the utilization efficiency of the high frequency power is increased.

Further, by winding the internal conductor 15 around a magnetic material, the high-frequency magnetic field 42 can be efficiently generated inside the magnetic material. And since the magnetic body is annular,
A large high-frequency magnetic field 42 is obtained. This high-frequency magnetic field 42
, The high-frequency power supplied to the acceleration cavity 2 increases, so that a high acceleration voltage is obtained in the gap 12. Here, the winding direction of the internal conductor 15 is determined regardless of the phase of the output power of the high-frequency power generator 30A.
The selection is made such that the directions of the high-frequency magnetic fields 42 generated within 0 coincide. The same applies to the following embodiments.

This is because, in the n sub-circuits connected in series in FIG. 2B, the voltage generated in each sub-circuit is small, but as a result of coupling these in series, Indicates that a large voltage can be obtained.

Further, in this embodiment, the tip of the inner conductor 15 is connected to the inner wall of the outer conductor 10 of the acceleration cavity. The effect can be obtained.

In this embodiment, the non-tuning type acceleration cavity is described as an example. However, the same effect can be obtained with a tuning type acceleration cavity. The same applies to the embodiments described below. (Embodiment 2) A second embodiment of the accelerating cavity according to the present invention will be described with reference to FIGS. This is the annular magnetic body 2
A case where a power supply circuit (high-frequency power supply device 35) is configured for each 0 is shown. The accelerating cavity is an untuned accelerating cavity. The accelerating cavity system includes an accelerating cavity inner conductor 11, an accelerating cavity outer conductor 10, an annular magnetic body 20, an accelerating gap 12,
It is composed of a power supply line 40 and a high-frequency power generator 30C. The number of the annular magnetic bodies 20 loaded in the cavity is eight.

In the high-frequency power generator 30C, the same high-frequency power is supplied to several minutes of the annular magnetic body 20 loaded in the accelerating cavity, that is, so that the same high-frequency power is supplied to every annular magnetic body.
High frequency power is branched.

The arrangement and connection of the inner conductor and the outer conductor of each feed line 40 are the same as those of the coaxial cable of the first embodiment.

Since the internal conductor of the power supply line 40 is wound around the annular magnetic body 20, a high-frequency current 41 flowing through the internal conductor generates a high-frequency magnetic field 42 inside the annular magnetic body.

High-frequency power is supplied to the acceleration cavity by these high-frequency magnetic fields 42. Then, an accelerating voltage is generated in the gap 12. When the ion beam 60 passes through the gap 12, it is accelerated by the acceleration voltage.

The equivalent circuit of this embodiment is a case where n = 8 in the equivalent circuit of FIG. Therefore, the accelerating voltage V ₈ generated in the gap 12 is represented by the following equation (4), where n = 8.

[0073]

(Equation 5)

Is given by Here, V _d is the accelerating voltage accelerating cavity direct coupling occurs. Accelerating cavity 2 of the present embodiment is capable of generating almost three times the acceleration voltage of V _d. In the conventional example, the power supply to the cavity is direct coupling between the inner and outer conductors of the cavity. However, the present invention indicates that the inductive coupling utilizes the inductance of the magnetic material.

Assuming that the impedance of the conventional cavity is Z _d , the impedance per power supply circuit in the present invention is Z _d.
d / 8, which is 1 / the number of magnetic materials.

[0076] Thus, in the present invention, the impedance decreases per each feeder circuit, the reflection of the high frequency power eliminates the impedance mismatch by approaching Z ₀ is reduced.
Therefore, the power use efficiency increases.

(Embodiment 3) A medical circular accelerator 1 to which an ion beam accelerator 13 according to a third embodiment of the present invention is applied will be described with reference to FIG.

In the circular accelerator 1, the pre-accelerator 50
Injector 51 for receiving the ion beam 60 accelerated by the
A deflecting magnet 52 that bends the trajectory of the ion beam 60 incident from the injector 51; a quadrupole magnet 53 that diverges or converges the ion beam 60; an emitter 54 that emits the ion beam 60 to a laboratory or radiotherapy room 70; The ion beam accelerator 13 is disposed along an annular vacuum duct 55 through which the ion beam 60 passes.

The ion beam 60 accelerated by the pre-accelerator 50 is incident on the circular accelerator 1 by the injector 51. After being accelerated to a predetermined energy by the ion beam accelerator 13, it is taken out of the circular accelerator 1 by the emitter 54. The extracted ion beam
Used in a laboratory or radiotherapy room 70.

The ion beam accelerator 13 will be described with reference to FIGS.

The ion beam accelerator 13 of this embodiment is
It is composed of an acceleration cavity 2 loaded with eight annular magnetic bodies 20, and a high-frequency power supply device 35A.

The acceleration cavity 2 is a non-tuned acceleration cavity having the same structure as that of the first embodiment.

Both ends of the accelerating cavity conductors 11 C and 11 D are connected to the vacuum duct 55 of the circular accelerator 1.

The high-frequency power supply device 35A has one high-frequency power generation device 30B for generating high-frequency power and one input and eight outputs connected to the output of the high-frequency power generation device 30B instead of the high-frequency power generation device 30A of the first embodiment. Turnout 3
1 is provided.

The eight power transmission lines 34 and the winding portions 33 are provided for each of the annular magnetic members 20 as in the first embodiment. The power transmission path 34 includes the coaxial cable 14 and the amplifier 32. Each amplifier 32 is connected to each of the eight outputs of the splitter 31.

The arrangement and connection of the inner conductor 15 and the outer conductor 16 of each coaxial cable 14 are the same as in the first embodiment.

The high-frequency power generated by the high-frequency power generator 30B is split by the splitter 31 into eight high-frequency powers. Each of the branched high-frequency powers is supplied to an amplifier 32
Is amplified by The magnitudes and phases of the eight amplified high-frequency powers are all the same. The amplified high-frequency power is transmitted to the annular magnetic body 20 via the coaxial cable 14.
Since the internal conductor 15 is wound around the annular magnetic body 20, a high-frequency current flowing through the internal conductor 15 generates a high-frequency magnetic field 42 inside the annular magnetic body 20.

The high-frequency magnetic field 42 supplies high-frequency power to the acceleration cavity 2. Then, an accelerating voltage is generated in the gap 12. When passing through the gap 12, the ion beam 60 is accelerated by the generated acceleration voltage.

The equivalent circuit of this embodiment is a case where n = 8 in the equivalent circuit of FIG. Therefore, the acceleration voltage V ₈ generated in the gap 12
Is given by Equation 5 assuming n = 8 in Equation 4. Accelerating cavity 2 of the present embodiment is capable of generating almost three times the acceleration voltage of V _d.

The impedance Z _d / 8 of one annular magnetic body 20 is connected to one power transmission line 34. That is, in the present embodiment, as in the first embodiment, the load impedance Z ₈ in the power transmission line 34 decreases and approaches the characteristic impedance Z ₀ of the power transmission line.

Therefore, in this embodiment, as in the first embodiment,
The efficiency of using high-frequency power is increased. In each power transmission line 34, the magnitude and phase of the high-frequency power transmitted by the coaxial cable 14 and the direction of the winding of the internal conductor 15 are the same, so that the eight annular magnetic bodies 2
The magnitude and phase of the high-frequency magnetic field 42 generated within 0 are all the same. Further, by winding the internal conductor 15 around the annular magnetic body 20, a larger high-frequency magnetic field can be generated inside the magnetic body. Through the high-frequency magnetic field 42, the high-frequency power supplied to the acceleration cavity 2 increases, and a higher acceleration voltage can be obtained.

Further, since the amplifier 32 is provided in each of the power transmission lines 34, the output of the high-frequency power generator 30B may be small. Therefore, the splitter 3 having a small power capacity
1 and an amplifier 32 can be used. Accordingly, the high-frequency power supply device 35A can be downsized, and the ion beam accelerator 13 can be downsized.

Further, since one high-frequency power generator 30B is connected to the splitter 31, there is no need to synchronize the high-frequency powers output from the amplifiers 32. Example 1
Since a separate high-frequency power generator 30 is provided, a separate device for synchronizing each high-frequency power output from each amplifier 32 is required. In the present embodiment, such a device for synchronizing is not required, and the device configuration is simpler than in the first embodiment.

The above-described ion beam accelerator 13
Is used in the circular accelerator 1, the reflected power in the ion beam accelerator 13 is reduced, and the utilization efficiency of the high-frequency power is increased, so that the power efficiency of the circular accelerator 1 can be improved. Further, since the ion beam accelerator 13 can be downsized, the circular accelerator 1 can also be downsized.

(Embodiment 4) An ion beam accelerator 13A according to a fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, similarly to the third embodiment, a power transmission line 34 is provided for each annular magnetic body 20. In the present embodiment, by the same operation as the third embodiment, the power use efficiency is high and a high acceleration voltage is obtained.

(Embodiment 5) An ion beam accelerator 13B according to a fifth embodiment of the present invention will be described with reference to FIG.

The accelerating cavity 2 of this embodiment is a non-tuned type accelerating cavity having the same structure as that of the third embodiment.

In this embodiment, the eight annular magnetic members 2
0 is divided into four groups of two, and a power transmission line 34 is provided for each group.

The high-frequency power supply device 35B includes a high-frequency power generator 30B for generating high-frequency power, a one-input four-output splitter 31B connected to the output of the high-frequency power generator 30B,
It comprises a power transmission line 34 connected to the four outputs of the branching device 31B, respectively, and a winding part 33 connected to the power transmission line 34.

The coaxial cable 14 is connected in the same manner as in the third embodiment. The inner conductor 15 of one coaxial cable 14 is wound around two annular magnetic bodies 20.

The equivalent circuit of this embodiment is a case where n = 4 in the equivalent circuit of FIG. 2 of the first embodiment. Therefore, the acceleration voltage V ₄ generated in the gap 12 is n
= 4

[0102]

(Equation 6)

Is given by Here, V _d is the accelerating voltage accelerating cavity direct coupling occurs. Accelerating cavity 2 of the present embodiment is capable of generating approximately twice the acceleration voltage of V _d.

Then, the impedance Z _d / 4 of the two annular magnetic bodies 20 is connected to one power transmission line 34. That is, in this embodiment, as in the first embodiment, decreases the load of the impedance Z ₄ in the power transmission path 34, closer to the characteristic impedance Z ₀ of the power transmission path.

Therefore, in this embodiment, similarly to the first embodiment,
The efficiency of using high-frequency power is increased. As described above, if the number of ring-shaped magnetic bodies included in one group is the same, the power transmission path 34 is provided for each group, and the power use efficiency is high and the power usage efficiency is high due to the same operation as the present embodiment. An accelerating voltage is obtained.

Further, when the magnetic bodies are divided into groups as in this embodiment, the number of groups may be any number. However, in the case where one power transmission line 34 and the high-frequency power generator 30B are provided with all the magnetic bodies as one group, the present embodiment has the same performance as that of the case of direct coupling.

[0107]

According to the first aspect of the invention , the reflected power is reduced, and the utilization efficiency of the high-frequency power is increased. In addition, high-frequency
The means for supplying force can be miniaturized and an ion beam accelerator
Can be reduced in size.

According to the second aspect , the reflected power is reduced,
The efficiency of using high-frequency power is increased. In addition, high frequency power
Supply means can be downsized, and the ion beam accelerator can be downsized.
Can be typed.

According to the third aspect, the high-frequency power supplied into the acceleration cavity is increased, and a higher acceleration voltage can be obtained.

[0110]

According to the fourth aspect, a large electric power is supplied into the acceleration cavity, and a high acceleration voltage can be obtained.

[0112]

[0113]

[0114]

[0115]

[Brief description of the drawings]

FIG. 1 is a structural diagram of an ion beam accelerator according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an equivalent circuit of the ion beam accelerator according to the first embodiment of the present invention.

FIG. 3 is a structural diagram of an ion beam accelerator according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line III-III of FIG. 3;

FIG. 5 is a structural diagram of a circular accelerator using an ion beam accelerator according to a third embodiment of the present invention.

FIG. 6 is a detailed view of the ion beam accelerator of FIG.

FIG. 7 is a sectional view taken along line VI-VI of FIG. 6;

FIG. 8 is a structural diagram of an ion beam accelerator according to a fourth embodiment of the present invention.

FIG. 9 is a structural view of an ion beam accelerator according to a fifth embodiment of the present invention.

FIG. 10 is a view showing a conventional non-tuned acceleration cavity.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Circular accelerator, 2, 3 ... Acceleration cavity, 10 ... Acceleration cavity outer conductor, 11 ... Acceleration cavity inner conductor, 12 ... Gap, 13 ...
Ion beam accelerator, 14 coaxial cable, 15 inner conductor, 16 outer conductor, 20 annular magnetic body, 27 electric insulator, 30 high frequency power generator, 31 branching device,
32 amplifier, 33 winding part, 34 power transmission path, 35
... high-frequency power supply device, 41 ... high-frequency current, 42 ... high-frequency magnetic field, 50 ... pre-stage accelerator, 51 ... injector, 52 ... deflection magnet, 53 ... quadrupole magnet, 54 ... emitter, 55 ... vacuum duct, 60 ... ion Beam, 70 ... Laboratory or radiotherapy room.

Continuation of front page (56) References JP-A-63-76299 (JP, A) James E. Leiss, "INDUCTION LINEAR AC CELATORS AND THE IR APPLICATIONS" IE EE Trans. Nucl. , Sc i. , NS-26, No. 3, June. 3870-3876 K.C. Saito et al. , "F INEMET-core Iodized untuned RF cavity", Nucl. Instr. and Meth. A 402 (1998) 1-13 (58) Field surveyed (Int. Cl. ⁶ , DB name) H05H 13/04 H05H 7/00-7/22

Claims (6)

(57) [Claims] An accelerating external conductor having a space therein; an accelerating internal conductor penetrating one side wall of the accelerating external conductor and passing an ion beam through the interior; An ion beam accelerator comprising: a plurality of magnetic bodies disposed in a conductor so as to surround the accelerating cavity conductor;
A branching device for branching the generated high-frequency power into a plurality , and provided for each magnetic body, and branched by the branching device.
Amplifying a plurality of high-frequency powers for each high-frequency power
An ion beam accelerator, comprising: a plurality of transmission means for transmitting to a magnetic material . 2. An accelerating outer conductor having a space therein, an accelerating inner conductor penetrating one side wall of the accelerating outer conductor and passing an ion beam through the interior, and an accelerating outer conductor. An ion beam accelerator comprising: a plurality of magnetic bodies disposed in a conductor so as to surround the accelerating cavity conductor;
A branching device for branching the generated high-frequency power into a plurality of parts;
And a plurality of high-frequency powers branched by the branching device.
A plurality of amplifying each high frequency power and transmitting to each group
Ion beam accelerating device being characterized in that a transmission means. 3. The ion beam accelerator according to claim 1, wherein said high-frequency wave amplified by said transmission means is provided.
An ion beam accelerator, wherein magnetic fields in the same direction are generated in all the magnetic bodies by electric power . 4. A either ion beam accelerating device of claim 1 to claim 3, wherein the accelerating cavity inner conductors is of two accelerating cavity inner conductor penetrating respectively different side walls of the accelerating cavity outer conductor An ion beam accelerator, wherein the two accelerating cavity conductors are arranged to face each other so as to form a gap between the ends. In any of the ion beam accelerating device 5. A method according to claim 1 to claim 4, wherein the magnetic member is an annular, the accelerating cavity inner conductor has a feature in that through the magnetic body of the annular Ion beam accelerator. 6. A vacuum duct through which an ion beam passes.
And the ion beam accelerated by the pre-accelerator
And an injector that is incident along the vacuum duct.
A deflection magnet and a quadrupole magnet, and the ion beam
An ion beam accelerator for accelerating the ion beam,
A circle comprising an emitter for emitting to a laboratory or radiotherapy room
In the shape accelerator, the ion beam accelerator is provided in accordance with any one of claims 1 to 5.
Characterized in that it is any ion beam accelerator
Circular accelerator.