CN212677436U

CN212677436U - Charged particle acceleration device

Info

Publication number: CN212677436U
Application number: CN202020951079.7U
Authority: CN
Inventors: 陈进安
Original assignee: Individual
Current assignee: Chinan Biomedical Technology Inc
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-03-09
Anticipated expiration: 2030-05-29

Abstract

A charged particle accelerating device comprises a cavity, a pipeline component, a corrugated pipe, a plurality of magnetic rings and a voltage source. The pipeline component comprises a first vacuum tube, an accelerating vacuum tube and a second vacuum tube which are connected in series in sequence. The first vacuum tube is provided with a first connecting end which is positioned outside the cavity, the second vacuum tube is provided with a second connecting end which is positioned outside the cavity, and the accelerating vacuum tube is positioned in the cavity. The corrugated pipe is sleeved outside the first vacuum pipe, absorbs the stress of the first vacuum pipe and limits the change of expansion with heat and contraction with cold on the overall structure of the cavity and the pipeline assembly. Therefore, the structural stability of the device operation is ensured, and the acceleration and the maintenance of the charged particle motion are prevented from being influenced.

Description

Charged particle acceleration device

Technical Field

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

Background

One of the current medical methods for treating cancer is to use a particle accelerator to accelerate charged particle beams to hit the target tumor, destroy the DNA of cancer cells by the charged particles, and prevent cell regeneration to kill the tumor cells. Since the DNA of cancer cells is particularly vulnerable to attack by charged particle beams, and some cancer cells are even particularly deficient in DNA repair, making them more sensitive to proton radiation; proton therapy is therefore considered to be an effective means of treating tumors. The method for treating cancer by accelerating charged particles with a synchronous acceleration system and emitting particle beams belonging to high-energy charged particle beams has been developed, which can effectively reduce tumor size and reduce the occurrence of side effects.

The conventional synchronous acceleration system has a high-frequency acceleration resonant cavity, and its main function is to provide sufficient acceleration voltage, so that the proton injected into the synchronous acceleration system can obtain energy, and thus reach the required energy and velocity. However, the synchrotron system is exposed to temperature variation during operation and requires an electromagnetic field to accelerate charged particles (e.g., protons); therefore, the structure of the charged particle accelerating device needs to be designed properly to ensure the best utilization efficiency of the synchronous accelerating system and the reliability of the whole operation.

SUMMERY OF THE UTILITY MODEL

The synchronous acceleration system is subject to temperature variation during operation and needs to be introduced with electromagnetic field, etc., and has limitations in material selection and structural design. In view of this, an object of the present invention is to provide a charged particle accelerating device, which is suitable for a synchronous accelerating system.

The utility model discloses a charged particle accelerating device of embodiment contains a cavity, a pipeline subassembly, a bellows, a plurality of magnetic ring and a voltage source. The cavity comprises a first face and a second face which are opposite to each other, and a side face connected with the first face and the second face. The pipeline component comprises a first vacuum tube, an accelerating vacuum tube and a second vacuum tube which are connected in series in sequence. The first vacuum tube is provided with a first connecting end which is positioned outside the cavity, the second vacuum tube is provided with a second connecting end which is positioned outside the cavity, and the accelerating vacuum tube is positioned in the cavity. The plurality of magnetic rings are sleeved outside the pipeline assembly and are positioned in the cavity. The bellows is sleeved outside the first vacuum tube. The corrugated pipe is provided with a third connecting end. The third connecting end is connected to the first connecting end of the first vacuum tube. The plurality of magnetic rings are sleeved outside the pipeline assembly and are positioned in the cavity. The magnetic rings are used for generating a magnetic field positioned in the accelerating vacuum tube. The accelerating vacuum tube is made of non-metal materials. The voltage source is coupled to the first vacuum tube and the second vacuum tube. The voltage source is used for generating an electric field positioned in the accelerating vacuum tube.

In an embodiment, the bellows is located outside the cavity, and the bellows has a fourth connection end opposite to the third connection end, and the fourth connection end is connected to the first surface of the cavity.

In one embodiment, the bellows is located in the cavity, the bellows has a fourth connection end opposite to the third connection end, and the fourth connection end is sleeved outside the first vacuum tube.

In one embodiment, the number of the bellows is two, and the two bellows are respectively located at the first connection end of the first vacuum tube and the second connection end of the second vacuum tube.

In one embodiment, the vacuum valve further comprises a welding structure for combining the first vacuum tube and the accelerating vacuum tube.

In one embodiment, the first vacuum tube further has a flange structure at the first connection end.

In one embodiment, the vacuum tube further comprises at least one connecting element for connecting the flange structure of the first vacuum tube and the third connecting end of the bellows.

In one embodiment, the connecting element is a screw.

Therefore, the charged particle accelerating device ensures the structural stability of the operation of the device through structural improvement, and avoids influencing the acceleration and the maintenance of the motion of the charged particles.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

Fig. 1 is a schematic view of a charged particle acceleration device according to an embodiment of the present invention;

fig. 2 is a schematic view of a charged particle acceleration device according to another embodiment of the present invention;

fig. 3 is a schematic view of a charged particle acceleration device according to another embodiment of the present invention.

Wherein the reference numerals

1: cavity body

2: pipeline assembly

3: corrugated pipe

4: magnetic ring

Voltage source 5

10 first side

12 the second side

14 side surface

20: a first vacuum tube

22 accelerated vacuum tube

24: second vacuum tube

200 first connection end

200a flange structure

240 second connection end

30 the third connecting end

32 the fourth connecting end

6: welding structure

7: connecting sheet

70 connecting element

Detailed Description

The following detailed description will discuss embodiments of the present invention, and will be exemplified with reference to the accompanying drawings. In the description of the specification, numerous specific details are set forth in order to provide a thorough understanding of the present invention; however, the present invention may be practiced without some or all of these specific details. The same or similar elements in the drawings will be denoted by the same or similar symbols. It is particularly noted that the drawings are merely schematic and do not represent actual sizes or quantities of elements, and that some of the details may not be fully drawn for clarity of the drawings.

Fig. 1 is a schematic diagram of a charged particle acceleration device according to an embodiment of the present invention. Referring to fig. 1, an embodiment of a charged particle acceleration apparatus of the present invention includes a chamber 1, a pipe assembly 2, a bellows 3, a plurality of magnetic rings 4, and a voltage source 5. The cavity 1 includes a first surface 10, a second surface 12 and a lateral surface 14, wherein two sides of the lateral surface 14 are respectively connected to the first surface 10 and the second surface 12, that is, the first surface 10 and the second surface 12 are oppositely disposed on two opposite sides of the lateral surface 14, thereby forming the cavity 1 having an accommodating space. In the embodiment, the cavity 1 has a cylindrical shape, wherein the first surface 10 and the second surface 12 are annular, and the central portion thereof has an opening through which the pipeline assembly 2 can pass. In one embodiment, the chamber 1 and the pipe assembly 2 are both cylindrical, and the axial center line of the pipe assembly 2 is aligned with the axial center line of the chamber 1.

The tube assembly 2 includes a first vacuum tube 20, an accelerating vacuum tube 22 and a second vacuum tube 24 connected in series. The first vacuum tube 20, the accelerating vacuum tube 22 and the second vacuum tube 24 all have hollow and interconnected passages, so that the interior of the tube assembly 2 has a path for charged particles to pass through. In this embodiment, the pipe assembly 2 is switched to a vacuum state by the action of the external vacuum pump, so that the pipe assembly 2 has a vacuum channel therein. Wherein, the first vacuum tube 20 has a first connection end 200 located outside the chamber 1 and connected to the external pipeline, and the other end (opposite to the first connection end 200) of the first vacuum tube 20 is connected to one end of the second vacuum tube 24. The second vacuum tube 24 has a second connection end 240 located outside the chamber 1 and connected to the external piping, and the other end (opposite to the second connection end 240) of the second vacuum tube 24 is connected to the other end of the second vacuum tube 24. In other words, the tube assembly 2 is connected to the external tube to form an annular vacuum tube for moving and accelerating the charged particles therein. As shown in fig. 1, at least a portion of the first vacuum tube 20 and the second vacuum tube 24 are located in the chamber 1, and the accelerating vacuum tube 22 is located in the chamber 1, that is, the chamber 1 is sleeved outside the pipeline assembly 2.

The bellows 3 can be disposed outside or inside the chamber 1, and the bellows 3 has a third connection end 30 and a fourth connection end 32 opposite to each other. In the present embodiment, the bellows 3 is located outside the chamber 1 and is sleeved outside the first vacuum tube 20. In particular, the third connection end 30 is connected to the first connection end 200 of the first vacuum tube 20, and the fourth connection end 32 is connected to the first face 10 of the chamber 1.

The magnetic rings 4 are sleeved outside the pipeline assembly 2 and are located in the cavity 1. The magnetic rings 4 generate a magnetic field (not shown), and at least a part of the magnetic field is distributed in the accelerating vacuum tube 22, so that the charged particles passing through the accelerating vacuum tube 22 can be accelerated. In the present embodiment, the magnetic rings 4 are disposed around the first vacuum tube 20 and the second vacuum tube 24 and spaced apart from each other by a predetermined distance. In one embodiment, the magnetic rings 4 are annular, and the axial center lines of the magnetic rings 4 are aligned with the axial center line of the pipeline assembly 2. In one example, the number of magnetic rings 4 outside the first vacuum tube 20 is equal to the number of magnetic rings 4 outside the second vacuum tube 24, and the magnetic rings 4 do not contact the first vacuum tube 20 and the second vacuum tube 24. In another embodiment, the magnetic rings 4 may be ferrite magnetic material or iron-based nanocrystalline soft magnetic material to generate a magnetic field. Since the charged particle acceleration mechanism is based on the electromagnetic field, the acceleration vacuum tube 22 for particle acceleration should be made of non-metal material so as not to shield the applied magnetic field, for example, the acceleration vacuum tube 22 is a ceramic vacuum tube, but not limited thereto.

The voltage source 5 is coupled to the first vacuum tube 20 and the second vacuum tube 24. In the present embodiment, the voltage source 5 is electrically connected to two adjacent ends of the first vacuum tube 20 and the second vacuum tube 24, thereby forming two electrode rings respectively located at two opposite sides of the accelerating vacuum tube 22. Since the accelerating valve 22 made of a non-conductive material is disposed between the first valve 20 and the second valve 24, an electric field (not shown) is generated between the first valve 20 and the second valve 24 and is located in the accelerating valve 22, and the direction of the electric field is changed at a fixed frequency. In general, when the charged particles generated by the charged particle generating device are, for example: the proton beam, passing through the first vacuum tube 20, the accelerating vacuum tube 22 and the second vacuum tube 24 in sequence, is subjected to the action of the electric field and the magnetic field to obtain acceleration, and finally reaches the expected target speed and energy.

In the process of accelerated movement of charged particles, an accelerating electric field in the accelerating vacuum tube 22 is generated by the plurality of magnetic rings 4 and the voltage source 5, however, the temperature change of the synchronous accelerating system is generated when the synchronous accelerating system is operated by the input of electric energy from the voltage source 5, so that the first vacuum tube 20 made of metal generates structural stress and extrudes the accelerating vacuum tube 22 made of non-metal material, and the accelerating vacuum tube 22 is easily broken by the stress extrusion of the first vacuum tube 20. The bellows 3 is sleeved outside the first vacuum tube 20, can absorb the stress of the first vacuum tube 20, and limits the thermal expansion and contraction change of the overall structure of the cavity 1 and the pipeline assembly 2. Therefore, the structural stability of the device operation is ensured, and the acceleration and the maintenance of the charged particle motion are prevented from being influenced.

Fig. 2 is a schematic diagram of a charged particle acceleration device according to another embodiment of the present invention. Referring to fig. 2, in an embodiment, the bellows 3 is located in the cavity 1 and is sleeved outside the first vacuum tube 20. Specifically, the third connecting end 30 is connected to the first connecting end 200 of the first vacuum tube 20, and the fourth connecting end 32 is sleeved outside the first vacuum tube 20, for example, but not limited to, the fourth connecting end 32 can be connected to the first vacuum tube 20 or connected to the side surface 14 through a rib (not shown) inside the cavity 1. Since the terms "first" and "second" are used herein for convenience of description, the bellows 3 can be disposed outside the second vacuum tube 24 or both the first vacuum tube 20 and the second vacuum tube 24 according to different embodiments, which can be modified and changed according to the user's requirements. That is, at least two bellows 3 are respectively located at the first connection end 200 of the first vacuum tube 20 and the second connection end 240 of the second vacuum tube 24, but not limited thereto.

Fig. 3 is a schematic view of a charged particle acceleration device according to another embodiment of the present invention. Referring to fig. 2, in an embodiment, the charged particle accelerating device further includes a welding structure 6. The welding structure 6 is used to join the first vacuum tube 20 and the acceleration vacuum tube 22, and to join the second vacuum tube 24 and the acceleration vacuum tube 22. In the prior art, the second vacuum tube 24 (e.g., a ceramic vacuum tube) and the first vacuum tube 20 (e.g., a metal vacuum tube) are typically connected by a flange (flange) structure. However, the metal material of the flange structure may cause the magnetic field inside the chamber 1 to be non-uniform, thereby affecting the acceleration effect of the charged particles. By means of the welded structure 6, it is possible to avoid influencing the accelerated movement of charged particles in the pipe assembly 2.

In at least one embodiment, the first vacuum tube 20 further has a flange structure 200a located at the first connection end 200. The flange structure 200a is used to connect vacuum lines in a synchronous acceleration system. In some embodiments, third connection end 30 of bellows 3 is connected to flange structure 200a of first vacuum tube 20 via a connecting tab 7. In another embodiment, the charged particle accelerating device further comprises at least one connecting element 70. The connecting element 70 is located on the connecting piece 7, and the connecting element 70 combines the flange structure 200a of the first vacuum tube 20 and the third connecting end 30 of the bellows 3 through the connecting piece 7; for example, the connecting element 70 is a screw, and a plurality of screws on the two sides of the connecting plate 7 lock the flange structure 200a of the first vacuum tube 20 and the third connecting end 30 of the bellows 3.

In summary, some embodiments of the present invention provide a charged particle accelerating device, which mainly utilizes at least one bellows 3 to connect to the first surface 10 of the cavity 1 and cover the first vacuum tube 20, so as to absorb the stress generated by the first vacuum tube 20 along with the temperature change during the process of accelerating the charged particles, thereby avoiding the accelerated vacuum tube 22 from being broken due to stress extrusion. Therefore, the structural stability of the device operation is ensured, and the acceleration and the maintenance of the charged particle motion are prevented from being influenced. In addition, the first vacuum tube 20, the accelerating vacuum tube 22 and the second vacuum tube 24 are connected by the welding structure 6 without arranging a metal flange structure 200a in the cavity 1, so that the accelerated motion of the charged particles in the tube assembly 2 is prevented from being influenced by the disturbance of the magnetic field distribution, and a proton beam meeting the use condition of proton treatment can be generated.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims

1. A charged particle accelerating device, comprising:

the cavity comprises a first surface, a second surface and a side surface, wherein the first surface and the second surface are opposite, and the side surface is connected with the first surface and the second surface;

the pipeline assembly comprises a first vacuum tube, an accelerating vacuum tube and a second vacuum tube which are sequentially connected in series, wherein the first vacuum tube is provided with a first connecting end which is positioned outside the cavity, the second vacuum tube is provided with a second connecting end which is positioned outside the cavity, and the accelerating vacuum tube is positioned in the cavity;

the corrugated pipe is sleeved outside the first vacuum pipe and is provided with a third connecting end connected with the first connecting end of the first vacuum pipe;

the magnetic rings are sleeved outside the pipeline assembly and positioned in the cavity, the magnetic rings are used for generating a magnetic field positioned in the accelerating vacuum tube, and the accelerating vacuum tube is made of a non-metal material; and

and the voltage source is coupled to the first vacuum tube and the second vacuum tube and used for generating an electric field positioned in the accelerating vacuum tube.

2. A charged particle accelerating device according to claim 1, wherein the bellows is located outside the chamber, and the bellows has a fourth connection end opposite to the third connection end, and the fourth connection end is connected to the first surface of the chamber.

3. The charged-particle accelerating device of claim 1, wherein the bellows is located in the chamber, the bellows has a fourth connection end opposite to the third connection end, and the fourth connection end is sleeved outside the first vacuum tube.

4. The charged-particle accelerating device of claim 1, wherein there are two bellows, respectively located at the first connection end of the first vacuum tube and the second connection end of the second vacuum tube.

5. The charged-particle accelerating device of claim 1, further comprising a welding structure for joining the first vacuum tube and the accelerating vacuum tube.

6. The charged-particle accelerating device of claim 1, wherein the first vacuum tube further has a flange structure at the first connection end.

7. The charged-particle accelerating device of claim 6, further comprising at least one connecting element for connecting the flange structure of the first vacuum tube and the third connecting end of the bellows.

8. A charged-particle accelerating device according to claim 7, wherein the connecting member is a screw.