TW201442571A - Charged particle accelerating device of synchrotron accelerating system - Google Patents

Abstract

A charged particle accelerating device of synchrotron accelerating system is disclosed. The accelerating device includes: a tubular body, a first vacuum tube disposed inside the tubular body, a second vacuum tube disposes inside the tubular body, a plurality of magnetic rings being orderly disposed in the tubular body to encompass the first and second vacuum tube with the same distant interval, and an AC power supply. Under interaction of the electric field generated by the AC power supply and the magnetic field generated by the magnetic rings, a charged particle passing through the first vacuum tube and the second vacuum tube can be instantly accelerated.

Description

Charged particle acceleration device for synchronous acceleration system

The present invention relates to a charged particle acceleration device, and more particularly to a charged particle acceleration device for a synchronous acceleration system and a structure thereof.

Charged particle acceleration devices accelerate charged particles to produce high-energy particles that meet the needs of various experiments in many different fields such as physics, semiconductors, and biomedical applications. Since the advent of charged particle accelerators, they have been an important tool in the scientific community. .

Today, cancer is becoming more and more common, and various cancer therapies are constantly being developed. Among them, the technology for treating cancer with proton beam is highly valued. Earlier, the medical community knew that radiation was used to fight cancer cells. However, radiation is generally easy to injure healthy cells. In contrast, proton beam treatment of cancer is easier because it is easy to control local cancer cells. potential.

It is known that the synchronous acceleration system can be used for proton beam therapy. In a typical synchronous acceleration system, there is a high-frequency acceleration resonant cavity whose main function is to provide sufficient acceleration voltage so that protons injected into the synchronous acceleration system can obtain energy, thereby achieving The energy required to synchronize the acceleration system. The design of this high-frequency accelerating cavity has a great influence on the reliability and usability of the entire synchronous acceleration system. The good design can ensure the optimal use efficiency of the synchronous acceleration system and the reliability of the overall operation.

Therefore, while developing proton beam therapy, how to master the design criteria and production technology of this high-frequency resonant cavity has become a topic that must be paid attention to by domestic related companies in the application of proton beam therapy. In particular, how to reduce the development cost of the overall equipment and avoid the burden of additional acquisition and maintenance costs is a must for the relevant industry.

In order to solve the above problems, the present invention provides a self-developed charged particle acceleration device for a synchronous acceleration system, which can effectively reduce the configuration space required for a proton accelerator and reduce maintenance compared to purchasing the same proton accelerator from abroad. Costs further promote the development of proton beam therapy technology.

According to the above object, the present invention provides a charged particle acceleration device comprising: a tubular body having a hollow interior and a vacuum, each of which is provided with a retaining wall at both ends; a first vacuum tube body, one of the tubular bodies The retaining wall is inserted into the tubular body, the axial center line of the first vacuum tube body is aligned with the axial center line of the tubular body; a second vacuum tube body is inserted into the tubular body by the other retaining wall of the tubular body, the first vacuum tube The body and the second vacuum tube body are not in contact with each other, and the adjacent and non-contacting ends of the first vacuum tube body and the second vacuum tube body are closed ends and there is a gap between each other; a plurality of magnetic bodies are located inside the tubular body, and Surrounding at least the first vacuum tube body at a certain interval, the magnetic body is not in contact with the first vacuum tube body or the second vacuum tube body, and the central position of the magnetic body is aligned with the tubular body, the first vacuum tube body and the second vacuum tube body An axial center line; and an AC power source electrically connected to the first vacuum tube body and the second vacuum tube body; wherein the AC power source generates an electric field, the magnetic body generates a magnetic field, and the electric field Field of the pair interaction sequentially obtained by an acceleration of charged particles of the first member and the second vacuum tube of the vacuum tube body.

In one embodiment, the tubular body is a cylindrical tubular body having a radius of preferably 700-800 mm; the first vacuum tube body and the second vacuum tube body are cylindrical and have a radius of 150-250 mm; The total number is six or eight, preferably annular, and the outer diameter is preferably 550-700 mm, the inner diameter is preferably 275-325 mm, and the thickness is preferably 20-30 mm. The material is ferrite. a magnetic material or an iron-based nanocrystalline soft magnetic material; the aforementioned charged particles are preferably protons; the magnetic system surrounds the first vacuum tube body and the second vacuum tube body respectively inserted into the tubular body at intervals, and surrounds the first vacuum tube body The number of magnetic bodies is equal to the number of magnetic bodies 16 surrounding the second vacuum tube body.

In another embodiment, the magnetic system surrounds only the first vacuum tube body that is inserted into the tubular body at a certain interval.

The charged particle acceleration device according to various embodiments of the present invention has the following characteristics: charged particles have an acceleration energy ranging from 7 to 300 million electron volts (MeV), and an alternating current power source has a frequency range of 1.2 to 6.8 megahertz (MHz). Operating voltage is 0.5 to 2 kV (kV), operating power is 0.5 to 2.8 kW, working phase is 35 to 39 degrees, phase deviation is not more than ±0.5 degrees, and standing wave ratio (Voltage Standing Wave Ratio) ;VSWR) is no more than 3.

Through the charged particle accelerating device proposed by the invention, the high-frequency resonant cavity technology of the particle accelerating device can be self-mastered in the country, so that the development cost of the particle accelerating device can be reduced, and thus the cost can be realized when the synchronous accelerating system needs to be built in the future. Effectively, the cost of maintaining a synchronous acceleration system is also reduced.

Another main object of the present invention is to provide a charged particle acceleration device, which can improve the technical level of domestic proton therapy, thereby improving the quality of cancer treatment and improving the quality of life of Chinese people.

Another main object of the present invention is to provide a charged particle acceleration device that can be applied to a high frequency acceleration system in a large frequency range, so that the time and cost required for re-planning can be reduced in the future when a large number of systems are built.

1. . . Charged particle accelerator

12. . . Tubular body

122. . . Retaining wall

13. . . Proton beam

142. . . First vacuum tube

144. . . Second vacuum tube

15. . . AC power

152. . . Electrically conductive line

154. . . Electrically conductive line

16. . . Magnetic body

18. . . gap

2. . . Charged particle accelerator

twenty two. . . Tubular body

222. . . Retaining wall

twenty three. . . Proton beam

242. . . First vacuum tube

244. . . Second vacuum tube

25. . . AC power

252. . . Electrically conductive line

254. . . Electrically conductive line

26. . . Magnetic body

28. . . gap

1 is a schematic cross-sectional view showing a charged particle accelerating device according to a first embodiment of the present invention;
2 is a perspective perspective view of a charged particle acceleration device according to a first embodiment of the present invention;
Figure 3 is a schematic plan cross-sectional view showing a charged particle accelerating device according to a second embodiment of the present invention.

The present invention mainly discloses a charged particle accelerating device for a synchronous acceleration system, and the techniques relating to how charged particles are generated are not the focus of the present invention, and are well known to those of ordinary skill in the art, so the following description does not These parts are detailed. In addition, the drawings referred to in the description below are not completely drawn according to the actual relevant dimensions, and their functions are only to illustrate the relevant features of the charged particle acceleration device of the present invention, and thus do not limit the present invention. The range of technical content to be protected.

First, please refer to FIG. 1 and FIG. 2, respectively, which are schematic cross-sectional views and perspective perspective views of a charged particle acceleration device according to a first embodiment of the present invention. As shown in Fig. 1 and Fig. 2, the charged particle acceleration device 1 of the present embodiment has a cylindrical tubular body 12, which is hollow inside and has a vacuum at the same time, and has a retaining wall 122 on each side; The first vacuum tube body 142 and the cylindrical second vacuum tube body 144 are respectively inserted into the tubular body 12 from the two side retaining walls 122 of the tubular body 12 and the first vacuum tube body 142 and the second vacuum tube body 144 are at least partially located in the tubular shape. The axial center line of the first vacuum tube body 142 and the second vacuum tube body 144 in the body 12 is aligned with the axial center line of the tubular body 12, and the first vacuum tube body 142 and the second vacuum tube body 144 are in the tubular body 12. The first vacuum tube body 142 and the second vacuum tube body 144 are non-closed ends, and there is a gap 18 between them, and the first vacuum tube body 142 and the second vacuum tube are not in contact with each other. The other end of the body 144 extends and is connected to other devices (not shown), while other devices (not shown) are not the focus of the present invention and will not be described in detail; the interior of the tubular body 12 further has a plurality of Figure 2 The magnetic body 16 of the annular shape surrounds the first vacuum tube body 142 and the second vacuum tube body 144 inserted into the tubular body 12 at intervals, and the center position of the magnetic body 16 is aligned with the tubular body 12, first The axial center line of the vacuum tube body 142 and the second vacuum tube body 144, the number of the magnetic bodies 16 surrounding the first vacuum tube body 142 is equal to the number of the magnetic bodies 16 surrounding the second vacuum tube body 144, and the magnetic body 16 is not connected to the first vacuum tube body. The material of the magnetic body 16 may be a ferrite material or a Fe-sub nanocrystalline soft magnetic material.

The cylindrical tubular body 12 of the charged particle acceleration device 1 disclosed in the first embodiment of the present invention preferably has a cylindrical radius ranging from 700 to 800 mm, and a cylindrical radius of the cylindrical first vacuum tube body 142 and the cylindrical second vacuum tube body 144. The range is preferably 150-250 mm, the outer diameter of the annular magnetic body 16 is preferably 550-700 mm, and the inner diameter of the annular magnetic body 16 is preferably 275-325 mm, the annular magnetic body. The thickness of 16 is preferably in the range of 20-30 mm. In a preferred embodiment, the radius of the cylindrical tubular body 12 is 750 mm, and the radius of the cylindrical first vacuum tube body 142 and the cylindrical second vacuum tube body 144 is 200 mm, and the outer diameter of the annular magnetic body 16 It is 675 mm, has an inner diameter of 300 mm and a thickness of 25.4 mm.

Referring to FIG. 1 again, in the use of the charged particle acceleration device 1 of the first embodiment of the present invention, the first vacuum tube body 142 and the second vacuum tube body 144 are respectively pulled out of the gap 18 between the two. 152, 154 is connected to an AC power source 15 to form an electrical connection. The connection between the conductive lines 152 and 154 and the first vacuum tube body 142 and the second vacuum tube body 144 are opposite to each other and are not in contact with each other. The AC power supply 15 provides communication. The voltage forms an electric field (not shown), and the magnetic body 16 forms a magnetic field (not shown). Therefore, when the charged particles such as the proton beam 13 generated by the charged particle generating device (not shown) sequentially pass through the first vacuum tube body 142 and the second vacuum tube body 144, they are subjected to an electric field (not shown) and a magnetic field ( The acceleration is obtained by acting instead of the figure. The preferred embodiment of the charged particle acceleration device 1 of the present embodiment uses the proton beam 13 as the charged particles, but is not limited thereto. In other embodiments, the charged particle acceleration device 1 may also use an electron beam or other. Charged particles.

The charged particle acceleration device 1 of the first embodiment of the present invention has the following characteristics in a preferred embodiment: the charged energy of the charged particles ranges from 7 to 300 million electron volts, and the frequency range of the alternating current power source ranges from 1 to 7. Million hertz, operating voltage is 0.5 to 2 kV, operating power is 0.5 to 2.8 thousand, working phase is 35 to 39 degrees, phase deviation is not more than ± 0.5 degrees.

In the charged particle acceleration device 1 of the first embodiment of the present invention, the total number of the magnetic bodies 16 is preferably six or eight, that is, three or four magnetic bodies 16 surround the first vacuum tube body 142 and the second, respectively. The vacuum tube body 144 according to this embodiment can make the shunt impedance greater than 250 ohms within the operating frequency range, and only requires about 2 kW input when the total number of magnetic bodies 16 is eight. High-frequency power can establish an acceleration electric field of 1kV. Further, the standing wave of the charged particle accelerating device 1 of the first embodiment of the present invention is preferably not more than 3. When the total number of the magnetic bodies 16 is six, a high-frequency transmission wire (not shown) having a characteristic impedance of 400 ohms can be selectively used between the magnetic bodies 16, and a vacuum adjustable capacitor is connected in parallel in the charged particle acceleration device 1 ( Not shown) to achieve an overall capacitance value of 30 picofarads (pF) to achieve the desired standing wave ratio. When the total number of the magnetic bodies 16 is eight, a high-frequency transmission wire (not shown) having a characteristic impedance of 700 ohms is used between the magnetic bodies 16, and a vacuum tunable capacitor is connected in parallel in the charged particle acceleration device 1 (not shown). ) Make the overall capacitance value up to 35 picofarad to achieve the desired standing wave ratio.

Next, please refer to FIG. 3, which is a schematic cross-sectional view of a charged particle acceleration device according to a second embodiment of the present invention. As shown in FIG. 3, the charged particle acceleration device 2 of the present embodiment has a cylindrical tubular body 22, the inside of the tubular body 22 is hollow and vacuum, and each side has a retaining wall 222; a first cylindrical vacuum tube body 242 and A second cylindrical vacuum tube body 244 is inserted into the tubular body 22 from the two side retaining walls 222 of the tubular body 22, respectively, such that at least a portion of the first vacuum tube body 242 and the second vacuum tube body 244 are located in the tubular body 22 and The axial centerlines of the vacuum tube body 242 and the first vacuum tube body 244 are aligned with the axial center line of the tubular body 22, and the first vacuum tube body 242 and the second vacuum tube body 244 are not in contact with each other in the tubular body 22, and The near and non-contacting ends of the first vacuum tube body 242 and the second vacuum tube body 244 are both non-closed ends, and a gap 28 exists between each other, and the other ends of the first vacuum tube body 242 and the second vacuum tube body 244 The extension and connection to other devices (not shown), and other devices (not shown) are not the focus of the present invention, and therefore will not be described in detail; the interior of the tubular body 22 further has a plurality of as shown in FIG. Annular magnetic body 26, The magnetic body 26 surrounds the first vacuum tube body 242 inserted into the tubular body 22 at a certain interval, and the center position of the magnetic body 26 is aligned with the axial center line of the tubular body 22 and the first vacuum tube body 242, and the magnetic body 26 is not The material of the magnetic body 26 may be a ferrite material or a Fe-sub Nanocrystalline soft magnetic material.

The cylindrical tubular body 22 of the charged particle acceleration device 2 disclosed in the second embodiment of the present invention preferably has a cylindrical radius ranging from 700 to 800 mm, and a cylindrical radius of the cylindrical first vacuum tube body 242 and the cylindrical second vacuum tube body 244. The range is preferably 150-250 mm, the outer diameter of the annular magnetic body 26 is preferably 550-700 mm, and the inner diameter of the annular magnetic body 26 is preferably 275-325 mm, the annular magnetic body. The thickness of 16 is preferably in the range of 20-30 mm. In a preferred embodiment, the radius of the cylindrical tubular body 22 is 750 mm, and the radius of the cylindrical first vacuum tube body 242 and the cylindrical second vacuum tube body 244 is 200 mm, and the outer diameter of the annular magnetic body 26 It is 675 mm, has an inner diameter of 300 mm and a thickness of 25.4 mm.

Referring to FIG. 3 again, in the use of the charged particle acceleration device 2 of the second embodiment of the present invention, the first vacuum tube body 242 and the second vacuum tube body 244 are respectively pulled out of the gap 28 between the two. 252, 254 are connected to an AC power source 25 to form an electrical connection, and the connection points of the electrical conduction lines 252 and 254 and the first vacuum tube body 242 and the second vacuum tube body 244 are opposite to each other and are not in contact with each other, and the AC power supply 25 provides communication. The voltage forms an electric field (not shown), and the magnetic body 26 forms a magnetic field (not shown). Therefore, when the charged particles such as the proton beam 23 generated by the charged particle generating device (not shown) sequentially pass through the first vacuum tube body 242 and the second vacuum tube body 244, they are subjected to an electric field (not shown) and a magnetic field ( The acceleration is obtained by acting instead of the figure. The charged particle acceleration device 2 of the present embodiment preferably uses the proton beam 23 as the charged particles, but is not limited thereto. In other embodiments, the charged particle acceleration device 2 may also use an electron beam or other charged particles.

The charged particle acceleration device 2 according to the second embodiment of the present invention has characteristics in a preferred implementation state, including an acceleration energy range of charged particles, a frequency range of an AC power source, an operating voltage, an operating power, and a work generated. The phase, the phase deviation, and the like are similar to those of the charged particle acceleration device 1 proposed in the first embodiment. Please refer to the above paragraph [0017], and therefore no further description is provided.

In the charged particle acceleration device 2 of the second embodiment of the present invention, the total number of the magnetic bodies 26 is preferably eight, that is, eight magnetic bodies 26 surround the first vacuum tube body 242. According to this embodiment, at work Within the frequency range, the shunt impedance value can be greater than 250 ohms, and only about 2 kW of input high frequency power can be used to establish an acceleration electric field of 1 kV. Further, the standing wave of the charged particle accelerating device 2 of the second embodiment of the present invention is preferably not more than 3.

The charged particle accelerating devices 1 and 2 according to the first embodiment and the second embodiment of the present invention can all produce a proton beam conforming to the proton therapy use condition, and have the required high frequency resonance characteristics, thus being in the synchronous acceleration system. In the construction, it can effectively reduce the cost of building and maintaining a proton accelerator for medical use, and can further enhance the development of domestic proton therapy.

In summary, the present invention has been described in detail by the above embodiments and variations. However, it will be understood by those skilled in the art that the present invention is to be construed as illustrative and not restrictive, Other variations and modifications of the charged particle acceleration device are covered by the present invention, which is defined by the scope of the appended claims.

1. . . Charged particle accelerator

12. . . Tubular body

122. . . Retaining wall

13. . . Proton beam

142. . . First vacuum tube

144. . . Second vacuum tube

15. . . AC power

152. . . Electrically conductive line

154. . . Electrically conductive line

16. . . Magnetic body

18. . . gap

Claims (10)

A charged particle acceleration device for a synchronous acceleration system, comprising:
a tubular body having a hollow interior and a vacuum, each of which is provided with a retaining wall at each end;
a first vacuum tube body is inserted into the tubular body by a retaining wall of the tubular body, and an axial center line of the first vacuum tube body is aligned with an axial center line of the tubular body;
a second vacuum tube body is inserted into the tubular body from another retaining wall of the tubular body, and an axial center line of the second vacuum tube body is aligned with an axial center line of the first vacuum tube body, the first vacuum tube body And the second vacuum tube body is not in contact with each other, and the first vacuum tube body and the second vacuum tube body are non-closed ends, and there is a gap between each other;
a plurality of magnetic bodies, located inside the tubular body, and surrounding at least the first vacuum tube body at intervals, the magnetic bodies are not in contact with the first vacuum tube body and the second vacuum tube body, and the central positions of the magnetic bodies Aligning the axial center line of the tubular body, the first vacuum tube body and the second vacuum tube body; and an AC power source electrically connected to the first vacuum tube body and the second vacuum tube body;
The alternating current source generates an electric field, and the magnetic bodies generate a magnetic field, and the interaction between the electric field and the magnetic field causes an acceleration to be sequentially passed through the charged particles of the first vacuum tube body and the second vacuum tube body. A charged particle acceleration device for a synchronous acceleration system according to claim 1, wherein the tubular body is a cylindrical tubular body. The charged particle acceleration device for a synchronous acceleration system according to claim 2, wherein the cylindrical tubular body has a radius of 700 to 800 mm. The charged particle acceleration device for a synchronous acceleration system according to claim 1, wherein the total number of the magnetic bodies is at least six. A charged particle accelerating device for a synchronous acceleration system according to claim 4, wherein the total number of the magnetic bodies is eight. The charged particle acceleration device for a synchronous acceleration system according to claim 1, wherein the first vacuum tube body and the second vacuum tube body are cylindrical and have a radius of 150-250 mm. The charged particle acceleration device for a synchronous acceleration system according to claim 1, wherein the magnetic bodies are annular and have an outer diameter of 550-700 mm, an inner diameter of 275-325 mm, and a thickness of 20 -30 mm. The charged particle acceleration device for a synchronous acceleration system according to claim 1, wherein the magnetic material is made of a magnetic material selected from the group consisting of a ferrite magnetic material and an iron-based nanocrystalline soft magnetic material. Group of. The charged particle acceleration device for a synchronous acceleration system according to claim 1, wherein the charged particles are protons. A charged particle acceleration device for a synchronous acceleration system, comprising:
a tubular body having a hollow interior and a vacuum, each of which is provided with a retaining wall at each end;
a first vacuum tube body is inserted into the tubular body by a retaining wall of the tubular body, and an axial center line of the first vacuum tube body is aligned with an axial center line of the tubular body;
a second vacuum tube body is inserted into the tubular body from another retaining wall of the tubular body, and an axial center line of the second vacuum tube body is aligned with an axial center line of the first vacuum tube body, the first vacuum tube body And the second vacuum tube body is not in contact with each other, and the first vacuum tube body and the second vacuum tube body are non-closed ends, and there is a gap between each other;
a plurality of magnetic bodies are disposed inside the tubular body and surround the first vacuum tube body and the second vacuum tube body at intervals, and the magnetic bodies do not contact between the first vacuum tube body and the second vacuum tube body. The central position of the magnetic body is aligned with the axial center line of the tubular body, the first vacuum tube body and the second vacuum tube body, the number of magnetic bodies surrounding the first vacuum tube body and the number of magnetic bodies surrounding the second vacuum tube body equal;
And an AC power source, which is electrically connected to the first vacuum tube body and the second vacuum tube body;
The alternating current source generates an electric field, and the magnetic bodies generate a magnetic field, and the interaction between the electric field and the magnetic field causes an acceleration to be sequentially passed through the charged particles of the first vacuum tube body and the second vacuum tube body.