JP2001052896A - Particle accelerating and accumulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a system while improving the incidence efficiency by arranging plural cavities on a particle orbit of an orbital accelerator, and performing the acceleration, deceleration and accumulation of the particles with one orbital accelerator. SOLUTION: Electron generated by an electron source 7 is accelerated, and passes through a primary electron orbit 8, and enters an electron accumulation cavity 4 including an X-ray target 9 made of a carbon narrow wire and arranged so as to cross the electron orbit. The electron accelerated by the carbon narrow wire receives the energy while passing through the accumulation cavity 4, but since the electron after passing the cavity has various energy, the electron orbits while drawing various scattered electron orbit 10. Most of the electron pass through without being attenuated by collision with the X-ray target 9, and reaches a deceleration cavity 2 with the initial energy. The reached electron returns the energy in the deceleration cavity 4, and the electron is accelerated by a next acceleration cavity, and continues to orbit on a storage orbit 16 as a primary electron orbit. Electron can be thereby continuously transferred from the initial acceleration to the storage mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an industrial field utilizing a charged particle accelerator, and particularly to an industrial field generating and utilizing high-intensity radiation.

[0002]

2. Description of the Related Art Among charged particle accelerators, high energy accelerators mainly use the principle of a synchrotron. However, since the mass of particles changes according to the principle of special relativity, initial acceleration and high energy acceleration are performed. Different accelerators are used for accelerating accumulation. In order to inject particles from the initial accelerator into the high energy accelerator or the storage accelerator, a pulse magnetic field or pulse electric field must be used.

[0003]

In a high energy accelerator, a plurality of accelerators are used, so that the size of the apparatus must be increased, and the incidence efficiency at the time of incidence from the initial accelerator to the high energy accelerator is finite. That is, there is a fundamental problem that high repetition incidence cannot be performed.

[0004]

[Means for Solving the Problems] A new principle of continuously inputting from the initial accelerator to the high energy accelerator without using a pulse electric field or a pulse magnetic field is provided, and the initial accelerator and the high energy accelerator or the storage accelerator are used. By providing means for integration, the incidence efficiency is improved and the size of the system is reduced.

[0005] The means is such that by arranging at least two cavities on a particle orbit of the orbiting accelerator, not only acceleration but also deceleration is performed, and accumulation of particles is performed by the same orbiting accelerator. Particle accelerating and accumulating device.

Further, by arranging at least two cavities on the particle orbit of the orbiting accelerator, not only the acceleration but also the deceleration is performed, so that the particles are continuously incident from the initial accelerator to the orbiting accelerator. This is a particle acceleration / accumulation device to be implemented.

Further, there is provided a particle accelerating / accumulating apparatus in which a wiggler is inserted into the orbit of an orbiting accelerator having at least one cavity and the phase is changed to shift from acceleration to accumulation.

Further, there is provided a particle accelerating / accumulating device in which accumulation is continuously performed by the same orbital accelerator by disposing an accumulation cavity on a particle orbit of an orbiting accelerator having at least one cavity. .

Further, in the orbiting accelerator having at least one cavity, a particle accelerator / accumulator for continuously accumulating particles by adjusting the voltage of the cavity so that the perimeter of the particle accumulation orbit does not become λn. is there. Here, if c is the speed of light, c / λ is the frequency of the microwave applied to the cavity. n is an integer.

Further, in the particle accelerating / accumulating apparatus, the particles accumulating particles by applying a voltage to the cavity such that the circumference of the particle accumulating trajectory is either 2λ or λ (n ± 1/2). Acceleration / accumulation device. Here, if c is the speed of light, c / λ is the frequency of the microwave applied to the cavity. n is an integer.

Further, in a particle accelerating / accumulating apparatus in which initial acceleration and accumulation are continuously performed, a thin wire or a thin film is inserted into a particle orbit including the inside of the cavity and the accumulation cavity to continue accumulation. A particle acceleration / accumulation device characterized by generating radiation.

Further, in a particle accelerating / accumulating apparatus in which initial acceleration and accumulation are performed continuously, a laser or microwave is injected into a particle orbit including a cavity and the inside of a accumulation cavity to collide with particles. The particle acceleration / accumulation device is characterized by emitting high-intensity light converted into a short wavelength in the traveling direction of particles while continuing accumulation.

Further, a cavity used in a particle accelerating / accumulating device in which initial acceleration and accumulation are performed continuously,
A particle accelerating / accumulating device, characterized in that a slit is provided in the accumulating cavity so that an electron beam or emitted light can be transmitted.

Further, in the particle accelerating / accumulating device in which the initial acceleration and accumulation are performed continuously, the outside of the orbit is covered with an annular mirror, and the radiation light is accumulated and taken out from one or a plurality of locations. A particle acceleration / accumulation device characterized by the above.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 will be described in detail with reference to FIG. An example of an electron which is a kind of particle will be described. However, the present invention can be applied to protons, ions, mesons, and any other charged particles. FIG. 1 shows two symmetric electromagnets 1 used in a circular accelerator called a race track type microtron, and a vacuum chamber
0, and the deceleration cavity 2, the acceleration cavity 3, and the storage cavity 4 are provided in the vacuum chamber 30. These cavities have the same shape and the same natural frequency, but are named deceleration cavities, acceleration cavities, and storage cavities. Instead of two symmetric electromagnets, one circular electromagnet may be used to arrange the deceleration cavity, the acceleration cavity, and the storage cavity between the magnetic poles of the magnet. The size of the electromagnet is 0.8m in major axis, 0.3m in width, and 0.
It is about 2m. In this embodiment, the deceleration cavity 2, the acceleration cavity 3, and the storage cavity 4 are set to 2.45 GHz. The deceleration cavity and the acceleration cavity supply the microwaves from the pulse klystron 5 via the waveguide 31 so as to perform the pulse operation, but supply the microwaves with their phases inverted by almost 180 degrees. The device for inverting the phase is the phase shifter 6,
Here, since it is configured to supply power from one pulse klystron, it is placed here. Of course, two pulse klystrons may be used, or a magnetron may be used. Describing other standard technologies required for microwave supply is not the purpose and is not shown in the figures. The storage cavity 4 is supplied with power from the CW klystron 11 so as to perform continuous operation. Although the phase of the storage cavity 4 with respect to the acceleration cavity 3 is advanced by about 90 degrees, it is desirable that the phase can be freely adjusted. Next, the placement of the electron source 7 is similar to that of a normal microtron, but here, the electron source 7 is placed inside the acceleration cavity.

In the embodiment of FIG. 1, the pulse klystron 5 generates a high-frequency electric field having a maximum of about 1 MV in the acceleration cavity and the deceleration cavity. The electrons generated by the electron source 7 are accelerated to 1 MeV, pass through the primary electron orbit 8 and enter the storage cavity 4. Approximately 100k using a CW klystron 11
Generates a high-frequency electric field of V. In the present embodiment, an X-ray target 9 made of a thin carbon wire having a thickness of about 10 microns is placed inside the storage cavity so as to cross the electron orbit. Of course, it is not necessary to use carbon, but tungsten or stainless steel may be used, and a thin film may be used instead of a thin wire. If the beam current value is large,
Sometimes the target is rotated and cooled. 3 shows a state in which the X-ray target is inserted. Next, the electrons decelerated by the fine carbon wire pass through the storage cavity and receive energy, but the electrons after passing have various energies that are continuous, so they draw various scattered electron orbits 10. It circulates again, collides with the X-ray target 9 again, is accelerated by the storage cavity 4 and continues circling, and continues to generate X-rays until the electron energy becomes zero. The important point is that although electrons have various energies, they always draw orbits through the storage cavity 4.
Then, all the electrons pass through the X-ray target. By arranging the storage cavity 4 and the deceleration cavity 2, the use efficiency of the electrons is increased. However, even without the deceleration cavity 2, the electrons orbit around the target to some extent. Efficiency can be increased. When there is no deceleration cavity 2, it is preferable to adjust the voltage applied to the acceleration cavity 3 and shift the circumference of the storage orbit 16 obtained by acceleration from the normal λn. For example, λ (n + 1/4) is one solution, and there are many other solutions. Where λ is
The wavelength of the microwave. This causes the particles to stop accelerating from some point or enter a deceleration mode. In this embodiment, a four-pole magnet 12 for further converging the electron beam is provided. From the X-ray target, an X-ray beam 13 is generated at a narrow angle in the traveling direction of the electrons.

Instead of placing an X-ray target, a laser or microwave is applied from the outside to collide with electrons,
Emitting light converted to a short wavelength in the traveling direction of electrons is one method of generating high-brightness short-wavelength light. In FIG. 1, such a laser 14 is installed. Here, a YAG laser of about 100 W is injected through the mirror 15 in a direction opposite to the X-ray beam. The X-ray target and laser are not used at the same time. Also in this case, the electrons that have lost energy due to the collision circulate at various energies, not as much as in the case of the X-ray target, and any electron passes through the storage cavity 4 and collides with the laser. High brightness light can be generated. Note that X
When accumulating the electron beam for a purpose other than the purpose of generating a ray, an X-ray target or a laser is not used.

Next, the role of the deceleration cavity will be described. The electron
Energy is attenuated by collision with an X-ray target or laser, but because the X-ray target is extremely thin and the cross-section of the collision is finite, many electrons pass through without being attenuated. Reaches the deceleration cavity 2 with the energy of. Even when a laser is used, the scattering cross section is not large. In the absence of the deceleration cavity 2, the electrons deviate from the primary electron orbit and collide with the vacuum vessel or storage cavity and stop at the next acceleration cavity 3 because the energy is doubled. The role of the deceleration cavity is to return the electron energy to 500 eV so that the electrons accelerated in the next acceleration cavity pass through the primary electron orbit. Therefore, a high-frequency voltage of the same magnitude as that of the acceleration cavity is generated in the deceleration cavity, but the phase is inverted.
Thus, the electrons that have not been attenuated continue to travel in the primary orbit, that is, the storage orbit 16. That is, the circuit circulates in the accumulation mode. The pulse klystron is not always running, but at intervals of about 10 Hz to 100 Hz, about 1 to 10
Operate with a width of μs. When the pulse klystron is stopped, the electrons already orbiting are not affected by the accelerating cavity and the decelerating cavity, recover the energy attenuated in the storage cavity, and continue orbiting. That is, the present invention makes it possible to continuously shift from the initial acceleration to the accumulation mode. That is, the injection accelerator and the storage accelerator are integrated,
The incident efficiency is set to 100% in principle.

Next, means for circulating electrons using a phase adjuster without using a deceleration cavity will be described with reference to FIG. FIG. 6 is based on the same circular microtron as in FIG. A three-pole wiggler for phase adjustment is placed at a position symmetrical to the acceleration cavity 3. The wiggler changes the path depending on the energy of the particles. The lower the energy, the smaller the curvature and the longer the path. After being accelerated to the n-turn orbit by the normal operation of the microtron,
The particles enter the wiggler, and as a result, the wiggler is adjusted so that the length of the trajectory on the (n + 1) th turn becomes (n + 1. + x) λ. The next time the particle enters the accelerating cavity, its phase advances by xλ, so that the particle does not receive the regular acceleration, stops accelerating repeatedly, and shifts to the accumulation mode. X is 1/2
In the case of, the deceleration mode is entered, deceleration is repeated, and the energy returns to the initial energy. By selecting X, a state in which deceleration and acceleration are repeated can be created. Although it is in an unstable equilibrium state, particles can accumulate for a certain period of time. x
For example, there is 0.02.

The first embodiment aims at generating hard X-rays by inserting an X-ray target or by colliding an electron and a laser, but it is of course possible to use synchrotron radiation. In such cases, 1M
At eV electron energy, the wavelength of the emitted light is limited, so the system will accumulate after accelerating more. The second embodiment will be described in detail with reference to FIG. FIG. 4 is a schematic view of a synchrotron or a synchrotron radiation device, which is one of the orbiting accelerators. Orbit 16
Is made of many bending magnets and multi-pole magnets,
It is not shown here because it is not the purpose to describe it. The storage cavity 4 is a cavity for compensating for loss due to radiation, and is the same as that inserted in a usual synchrotron or synchrotron radiation device. An acceleration cavity 3, a deceleration cavity 2, and a phase modulator 40 are inserted into such a normal synchrotron. The phase modulator 40 is constituted by a three-pole electromagnet called a wiggler here. The electromagnets 41 and 44 guide electrons from the injector 43 and adjust the trajectory of the orbiting electrons, and also have a wiggler structure. Here, the injector 43 employs a linac, but may be another accelerator. However, in order to make the injection efficiency 100%, the acceleration frequency of the linac and the acceleration cavity, deceleration cavity installed in the synchrotron,
The frequencies of the storage cavities should be the same.

The particles accelerated by the linac are deflected at 44 and travel through a part of the wiggler 41 to the orbit 16.
Is driven into. The injected electrons are accelerated in the acceleration cavity 3. After acceleration, the particles have an energy of E
₀ + Ea. E ₀ is the energy of the linac,
Ea is the energy provided in the accelerating cavity. The particles then pass through the phase modulation wiggler 40. Within the wiggler, particles pass through different trajectories depending on their energy. Low energy particles follow long paths and high particles follow short paths. The length of the path is inversely proportional to the energy. As a result, the time of arrival at the deceleration cavity 2 will depend on the energy. Energy is E ₀ + E
In the state a, the vehicle passes through the path 45. At this time, a magnetic field having a path length of mλ is given to the phase modulation wiggler. m is an integer. λ is the same as described above. The particles spend mλ / c including the drift space while moving from the acceleration cavity 3 to the deceleration cavity 2 so as to enter the deceleration cavity 2 in the acceleration mode. After passing through the deceleration cavity, the energy of the particles is E ₀ + 2Ea
Becomes The deceleration and acceleration cavities operate to provide the same energy. The particles pass through the wiggler 41 when making a round of the orbit. The wiggler is adjusted so that the accelerated particles follow a path as shown in FIG. 4 and intersect the incident trajectory. This is possible because the energy of the orbiting particles is higher than the energy of the incident particles. Then, when the particles enter the acceleration cavity 3 again, the deceleration cavity 2 is set so that the acceleration cavity 3 is in the acceleration mode.
This is to adjust the length of the orbit in the counterclockwise direction from to the acceleration cavity 3 to be kλ (k is an integer) including the path of the wiggler 41. The particles then pass through the phase-modulated wiggler again, when the energy of the particles is E ₀
Since the path is + 3Ea, the path becomes shorter and passes through a path 46 that changes by (n + 1/2) λ as a whole including the drift space. As a result, when reaching the deceleration cavity 2, the particle undergoes deceleration, so its energy is again E ₀ + 2Ea and the particle can follow the same orbit. But then the particles again accelerated cavity 3
, The phase has already changed by (n + 1/2) λ, so the particles undergo deceleration and the energy is E ₀ + Ea
Becomes Then, the particles pass through the path 45, and the phase change at this time is mλ. Therefore, the particles enter the deceleration cavity 2 in the acceleration mode, and the particle energy becomes E ₀ + 2Ea again and orbits the same orbit. Thereafter, the above process is repeated to orbit the orbit stably. Making the phase modulation wiggler 40 to be mλ or (n + 1/2) λ by energy is a standard technique, and therefore will not be described in detail.

Thus, the present invention provides an incident method which is applicable to a conventional synchrotron and has continuous and 100% incidence efficiency. The configuration using the two acceleration cavities and the phase modulation wiggler can be applied to a racetrack type microtron or a circular microtron. That is, FIG.
The wiggler may be inserted between the accelerating cavity and the decelerating cavity, or the decelerating cavity and the accelerating cavity may be placed at opposite positions as shown in FIG. Of course, in this embodiment, an X-ray target and a laser can be incorporated as in the first embodiment. Next, another example in which the present invention is applied to a race track type microtron is shown in FIG. In this embodiment, the particles are also supplied from the linac 43. Needless to say, an electrostatic accelerator or a normal microtron may be used instead of the linac. The particles are accelerated in the accelerating cavity 2, repeatedly accelerated according to the principle of the microtron, pass through each orbit 52, finally pass through the orbit 54, enter the wiggler 56, and are guided to the decelerating cavity 3. The wiggler has a quarter period. The particle energy at this time is Eo. In the deceleration cavity, the energy is initially accelerated and the energy is Eo + E
After passing through the accelerating cavity, it becomes Eo + 2Ea and passes through the orbit 53. At this time, the particles pass through the wiggles 57, 56, and constitute a wiggler having a period of 1/2 with 56 and 57. The length of the path is (n + 1/2) λ, and the particles reach the deceleration cavity 3. Is inverted. As a result, the particles undergo deceleration and the energy becomes Eo + Ea, so that the particles pass through the same orbit 55. The particles are then subjected to deceleration in the accelerating cavity 2 where the energy is again E
It becomes o and passes through the orbit 54. The next time the particles pass through the deceleration cavity 3, the process has been switched back to acceleration mode. In this manner, the particles enter an accumulation mode in which the particles alternately pass through the orbits 53 and 54 and repeat orbits. Note that 54
Path is λ from cavity 2 including wiggler to λ
And the length of the cavities 3 to 2 passing through 55 must also be an integral multiple including the wiggler 58. 5
Reference numeral 8 denotes a wiggler for incidence, which has the same structure as 44 and 41 in FIG. When the injection operation is completed and the acceleration cavity and the deceleration cavity are stopped, the particles having the energy Eo + Ea orbit the orbits 55 and 54 constantly. Here, if a structure in which the initial microtron acceleration is not performed and the mode immediately shifts to the accumulation mode is used, the structure is the same as that of the embodiment of FIG.

The third embodiment will be described in detail with reference to FIG. The third embodiment uses a perfect circular electromagnet such as a circular microtron. The arrangement of the deceleration cavity 2 is different from that of the first embodiment. Although the deceleration cavity 2 is located symmetrically with the acceleration cavity 3, it need not be. The accelerating cavity 3, the decelerating cavity 2, and the storage cavity 4 can operate at the same fundamental frequency, and the accelerating cavity 3 and the decelerating cavity 2 can operate at the same phase or inverted phases. In this embodiment, electrons are accelerated several times in the accelerating cavity 3 according to the microtron principle, for example, accelerated 10 times to about 10 MeV, and then passed through the decelerating cavity 2 and the storage cavity 4. According to the principle of the microtron, the radius of the electron orbit becomes larger as the energy is increased.
This is shown as an N-th orbit 33. The principle of the microtron is well known and will not be described in detail here. The magnitude of the high-frequency electric field generated in the deceleration cavity 2 may be the same, half, or 1.5 times as in the first and second embodiments. In the same case, acceleration and deceleration occur in the same sequence as in the second embodiment. For example, if the particles are rotating in the counterclockwise direction, the energy is always the same in the lower half E ₀ +
In the upper half, E ₀ + Ea and E ₀ + 3Ea are repeated, and a result of orbiting with the orbital radius corresponding thereto is obtained. In this configuration, since there is no wiggler corresponding to 56 in FIG. 55, the position passing through the acceleration cavity or the deceleration cavity is different each time. To eliminate this inconvenience, the cavity has a long slit.

When the high-frequency electric field of the deceleration cavity is half that of the acceleration cavity, the electron is decelerated or accelerated by the deceleration cavity so that the electron has a larger or smaller radius than the tenth electron orbit. Orbit 16 or 1
Go through 6 '. What is important here is how to determine the acceleration / deceleration trajectory. The length of the acceleration / deceleration trajectory must be a specific length. It the circumferential length of the acceleration and deceleration trajectory and lambda _S, when the wavelength of the microwave pulse klystron was lambda, is to set the _{λ S = λ (n ± 1} /2) to become as lambda _S . Here, n is an integer. If the phase of the microwave in the deceleration cavity is the same as that of the acceleration cavity, it becomes a plus sign, and if inverted, it becomes a minus sign. By doing so, the phase of the accelerated (or decelerated) electron becomes zero the next time it passes through the acceleration cavity 3.
That is, electrons are not accelerated or decelerated in the acceleration cavity 3. In this way, in the deceleration cavity 2, the phase is delayed (or advanced) by 180 degrees, so that the electrons are decelerated (or accelerated). That is, the electrons alternately accelerate and decelerate at the same voltage in the deceleration cavity 2. Therefore, the electrons continue in a storage state where the two energy states are repeated. Several μs to several tens μs
After the acceleration / deceleration operation is completed, the operation mode is shifted to the accumulation mode using only the accumulation cavity 4. In the accumulation mode, the emitted light is generated and the electron energy is attenuated. It is the accumulation cavity 4 that supplies the attenuated energy.
The phase of the storage cavity is shifted by about 90 degrees with respect to the phase of the accelerating cavity, but it is preferable that the phase can be adjusted in accordance with the radiation or emitted light emission power according to the principle of the synchrotron.

When the accumulated current value has attenuated, the acceleration / deceleration operation can be repeated again. Even if repeated, the accumulated electrons do not fall off. The length of the acceleration / deceleration trajectory is determined by the magnitude of the high-frequency electric field generated in the deceleration cavity. Although affected by the storage cavity, the voltage in the storage cavity is small compared to the voltage in the deceleration cavity and can be almost ignored. In the present embodiment, the storage cavity and the deceleration cavity are provided. However, since the same natural frequency is used, it is possible to use one unit for both. That is, the same cavity is supplied with power from both the pulse klystron and the CW klystron, but is made in phase with the same reference frequency generator. The above description is an example. The location of the deceleration cavity and its voltage can vary. There can be various phases and voltages of the storage cavity, but they are the same in principle. Of course, it can be used to store not only electrons but also any charged particles.

In FIG. 2, a concentric barrel-type mirror 17 is arranged around the storage orbit. This is based on the principle of the optical storage ring (Reference: Applied Physics Vol.65 (1) (1996) pp.
According to 41-47), radiation light is integrated and laser oscillation is performed to generate high-brightness light. On the mirror 17,
One or more light extraction ports are open so that light can be extracted. It goes without saying that the X-ray target can also be placed in the charged particle acceleration / accumulation device of the second embodiment.

Next, details of the deceleration cavity 2, the acceleration cavity 3, and the storage cavity 4 will be described with reference to FIG. Since these cavities have the same natural frequency, they can be made almost the same shape. FIG. 3 is a plan view and a side view of a rectangular cavity. Cavity internal sizes, 110x40x50mm ³
It is. Here, the _TM01 mode is generated in the cavity, but it is possible in principle to use a higher-order mode. The cavity is characterized by an open electron orbital plane.
That is, the slit 18 allows electrons and emitted light to pass freely. In this embodiment, an acceleration electrode 19 is provided in an acceleration cavity, and acceleration is performed in an acceleration gap 20 between the electrodes. In the first embodiment, since the secondary electron trajectory can take various forms, the inside of each of the acceleration cavity, the deceleration cavity, and the storage cavity (in the direction of the center of the electromagnet) is open.
In a second embodiment, the cavity is open on the outside in order to extract the emitted light. Due to the opening, some leakage of microwaves is observed, but no abnormality occurs in the required mode. FIG. 3 shows the X-ray target 9, in which a fine carbon wire is stretched across the electron orbit inside the acceleration electrode. Since no electric or magnetic field is generated at this position, it is suitable for placing a target. Of course X
In the second embodiment in which no line is generated, no target is set.

[0028]

The present invention makes it possible to integrate the initial accelerator and the storage accelerator by adding a deceleration cavity and a storage cavity to the orbiting electron trajectory of the orbiting accelerator to decelerate or accelerate the electrons. did. As a result, according to the present invention,
Since the size of the accelerator system can be reduced to half that of the conventional system and can be truly made into a tabletop, the accelerator system can be introduced into factories and hospitals. Also,
According to the present invention, in the conventional accelerator system, the efficiency of the accelerator from the initial accelerator to the storage accelerator was finite, but was increased to 100% in principle, so that the efficiency of the accelerator was greatly improved. If the present invention is applied to a conventional synchrotron or synchrotron radiation device, the accumulated current value can be easily increased 100 times. Furthermore, the energy of lost electrons is recovered by placing an X-ray target on the electron orbit in or near the storage cavity or by colliding the laser with the electrons to generate short wavelength light. Since the energy can be used efficiently to the end, an extremely high-brightness X-ray source has been realized.

[Brief description of the drawings]

FIG. 1 is a plan view and a side sectional view of a particle acceleration / accumulation device according to a first embodiment.

FIG. 2 is a plan view and a side sectional view of a particle acceleration / accumulation device according to a third embodiment.

FIG. 3 is a detailed view of a deceleration cavity, an acceleration cavity, and a storage cavity.

FIG. 4 is an overall configuration diagram of a particle acceleration / accumulation device according to a second embodiment.

FIG. 5 shows another example in which the present invention is applied to a race track type microtron.

FIG. 6 is an embodiment based on the same circular microtron as FIG. 2;

[Explanation of symbols]

1. Electromagnet 2. Deceleration cavity 3. Acceleration cavity 4. Storage cavity 5. Pulse klystron 6. Phase shifter 7. 8. Electron source 8. Primary electron orbit 9. X-ray target 10. 10. Scattered electron orbit CW klystron 12.4 pole electromagnet 13. Beam 14. YAG laser 15. Mirror 16. Storage trajectory 16 'Storage trajectory 17. Circular mirror 18. Slit 19. Accelerating electrode 20. Acceleration gap 30. Vacuum chamber 31. Waveguide 32. Secondary trajectory 33. N-th orbit 40. Phase modulation wiggler 41. Wiggler 43. Linac 44. Incident orbit orbit changing magnet 53. E ₀ + 3Ea electron orbital 54. E ₀ + Ea electron orbital 55. E ₀ + 2Ea electron orbital 56. Orbit changing magnet 57. Orbit changing magnet 58. Incident trajectory changing magnet

Claims (10)

[Claims] 1. A particle in which at least two cavities are arranged on a particle orbit of an orbiting accelerator so that not only acceleration but also deceleration is performed, and particles are accumulated by the same orbiting accelerator. Acceleration / accumulation device. 2. Arrangement of at least two cavities on the particle orbit of the orbiting accelerator so that not only acceleration but also deceleration is performed, and particles are continuously input from the initial accelerator to the orbiting accelerator. Particle acceleration / accumulation device. 3. A particle acceleration / accumulation device in which a wiggler is inserted into a circular orbit of a circular accelerator having at least one cavity and the phase is changed to shift from acceleration to accumulation. 4. A particle accelerating / accumulating device in which accumulation is continuously performed by the same orbital accelerator by disposing an accumulation cavity on a particle orbit of an orbiting accelerator having at least one cavity. 5. A particle accelerator / accumulator for continuously accumulating particles by adjusting the voltage of the cavity and preventing the perimeter of the particle accumulation orbit from being λn in the orbiting accelerator having at least one cavity. Here, if c is the speed of light, c /
λ is the frequency of the microwave applied to the cavity. n is an integer. 6. The particle accelerating / accumulating device according to claim 1, wherein the peripheral length of the particle accumulating orbit is nλ, λ (n
A particle accelerating / accumulating device that accumulates particles by applying a voltage such as ± 1/2) to the cavity. Here, if c is the speed of light, c / λ is the frequency of the microwave applied to the cavity. n is an integer. 7. A particle accelerating / accumulating apparatus in which initial acceleration and accumulation are continuously performed, wherein a thin wire or a thin film is inserted into a particle orbit including a cavity and the inside of an accumulation cavity to continuously accumulate radiation. A particle acceleration / accumulation device characterized in that the particles are generated. 8. A particle acceleration / accumulation device in which initial acceleration and accumulation are performed continuously, wherein a laser or microwave is injected into a particle orbit including a cavity and the inside of a accumulation cavity to collide with particles. A high-intensity light converted into a short wavelength in the traveling direction of the particles while the accumulation is continued. 9. A cavity used in a particle acceleration / accumulation device in which initial acceleration and accumulation are continuously performed, and a slit is provided in the accumulation cavity so that an electron beam or radiation light can be transmitted. Particle accelerating and accumulating device. 10. A particle acceleration / accumulation device in which initial acceleration and accumulation are continuously performed, wherein the outer periphery of the orbit is covered with an annular mirror, and radiation light is accumulated and taken out from one or a plurality of locations. A particle acceleration / accumulation device characterized in that: