Collimation and measurement device for low-energy transmission particle beam
By setting up a cooling water circuit and a beam transformer in the inner cavity of the beam collimator, the problem of the difficulty of the collimation and measurement device of the low-energy transmission particle beam flow is solved, and the uniform cooling of the beam collimator and accurate measurement of the beam intensity is achieved, which meets the beam quality requirements of the RF quadrupole accelerator.
Patent Information
- Application Number
- CN202311267516.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-28
AI Technical Summary
In BNCT, it is difficult for the collimation and measurement device of low-energy transmission particle beam flow to achieve fast and accurate energy determination and collimation, resulting in some beam flow not meeting the requirements of the RF quadrupole accelerator, and the beam flow collimator heats and deforms, affecting the beam flow quality.
A beam current transformer low-energy transmission line beam flow collimation device is designed. By setting a water inlet tank, water inlet pipe and cooling water path in the inner cavity of the beam current collimator, cooling water is used to circle flow to cool down, and a beam current transformer is provided on the outer wall of the beam current collimator to measure the beam current intensity.
The full and uniform cooling of the inner cavity of the beam collimator is achieved, ensuring that the beam transformer can accurately measure the beam intensity, meet the beam quality requirements of the RF quadrupole accelerator, and avoid the heating deformation of the beam collimator.
Smart Images
Figure CN119724673A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of particle beam collimation, and in particular to a low-energy transmission particle beam collimation and measurement device in BNCT. Background Art
[0002] The accelerator is the core of the particle beam, which is used to generate high-energy particles, gather them into dense beams, and accelerate them to a certain energy. For example, in BNCT, the ECR ion source is used as a proton generator. During the working process, hydrogen is first injected, microwave power is loaded, and a confining magnetic field is loaded. The hydrogen is ionized to produce plasma, and then high voltage is required to draw out the protons in the plasma, and the target is completed by further accelerating it to the required energy.
[0003] The plasma generated by the ECR ion source is drawn out through high voltage to form a proton beam, which enters the radio frequency quadrupole accelerator through a low-energy transmission line. The radio frequency quadrupole accelerator has certain requirements on the beam size and beam envelope, so a measurement and collimation device is needed to allow particle beams that meet the requirements to pass through, and those that do not meet the entry conditions will be blocked or absorbed by the filter cavity connected to the rear end of the measurement and collimation device. Therefore, a beam collimation and measurement device is designed at the end of the low-energy transmission line, that is, before the entrance of the radio frequency quadrupole accelerator, which can quickly and accurately determine and collimate the energy of the particle beam. Summary of the invention
[0004] The object of the present invention is to provide a collimation and measurement device for low-energy transmission particle beams to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: the collimation and measurement device comprises a beam collimator inner cavity and a cooling water path installed through a front flange, one side of the front flange is fixedly connected with the beam collimator inner cavity, the outer wall of the beam collimator inner cavity is sleeved with the beam collimator outer wall, the beam collimator inner cavity is provided with a cooling component for cooling the beam collimator inner cavity, the cooling component comprises a water inlet groove opened at the top of the front flange, the top of the water inlet groove is inserted and connected with a water inlet pipe for entering water flow, the outer wall of the beam collimator inner cavity is provided with a cooling water path for cooling the beam collimator inner cavity, and the cooling water path is connected with the water inlet groove.
[0006] Preferably, a drainage assembly for discharging water inside the cooling water channel is provided at the bottom of the front flange, the outer wall of the beam collimator is fixedly connected to one side of the front flange, the cooling water channel is a conical spiral structure, the cone angle of the cooling water is equal to the cone angle of the inner cavity of the beam collimator, and the cross-section of the outer wall of the beam collimator is convex.
[0007] Preferably, the drainage assembly includes a water outlet groove opened at the bottom of the front flange, the bottom of the water outlet groove is connected with a water outlet pipe, and the water outlet groove and the cooling water channel are interconnected.
[0008] Preferably, a flange connecting tube is fixedly connected to one side of the front flange, the inner cavity of the beam collimator is inserted and connected to the middle of the flange connecting tube, the outer wall of the beam collimator is inserted and connected to the middle of the flange connecting tube, and a rear flange is fixedly connected to one side of the flange connecting tube.
[0009] Preferably, a front end plate for fixing the position of the rear flange is provided on one side of the rear flange, the rear flange is fixedly connected to the front end plate by bolts, and a gap is provided between one side of the front end plate and the side opposite to the inner cavity and outer wall of the beam collimator.
[0010] Preferably, a beam transformer is sleeved in the middle of the outer wall of the beam collimator, a positioning ring for fixing the position of the beam transformer is provided on one side of the beam transformer, the positioning ring is sleeved in the middle of the outer wall of the beam collimator, and the beam transformer and the positioning ring are both arranged inside the flange connecting tube.
[0011] A collimation and measurement device for a low-energy transmission particle line beam, the collimation and measurement device comprises the beam transformer low-energy transmission line beam collimation.
[0012] Technical effects and advantages of the present invention:
[0013] The beam transformer low-energy transmission line beam collimation adds water inlet troughs, water inlet pipes and cooling water channels of different structures on the original basis. The cooling water enters the water inlet trough through the water inlet pipe, and flows into the cooling water channel through the water inlet trough, so that the inner cavity of the beam collimator is cooled by the cooling water channel spirally arranged in the inner cavity of the beam collimator. This design ensures that the inner wall of the inner cavity of the beam collimator is cooled fully and evenly. The gap design between the end of the inner cavity of the beam collimator and the rear front end plate ensures that the beam transformer can accurately measure the beam intensity passing through the beam transformer. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the front structure of the present invention.
[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention in a top view.
[0016] Figure 3 It is a schematic diagram of the front cross-sectional structure of the present invention.
[0017] In the figure: 1. front flange; 2. inner cavity of beam collimator; 3. outer wall of beam collimator; 4. water inlet groove; 5. water inlet pipe; 6. cooling water channel; 7. water outlet groove; 8. water outlet pipe; 9. flange connection; 10. rear flange; 11. front end plate; 12. beam transformer; 13. positioning ring; 14. gap. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the present invention of the low-energy transmission particle beam collimation and measurement device to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0019] Example: Low-energy transmission particle beam alignment and measurement device for BNCT
[0020] The "low energy" in the low-energy transmission particle beam in this embodiment refers to the electron energy of the particles, more specifically the energy of the ions, low-energy ions. Boron neutron capture therapy (BNCT for short) is one of the most advanced cancer treatments in the world. BNCT is a targeted, cell-level precision radiotherapy that combines radiation with drugs. The BNCT in this embodiment uses an ECR ion source as a hydrogen proton generator. An ion source is a device that ionizes neutral atoms or molecules and draws out an ion beam. It is widely used in accelerators, high-energy physics, ion implanters, semiconductors, and cancer treatment. As a proton generator, the ECR ion source first injects hydrogen, loads microwave power, and loads a confining magnetic field. The hydrogen is ionized to generate plasma, and then high voltage needs to be loaded to draw out the protons in the plasma, and the target is completed by further accelerating to the required energy. The plasma generated by the ECR ion source is drawn out through high voltage to form a proton beam, and the proton beam enters the radio frequency quadrupole accelerator through a low-energy transmission line. The radio frequency quadrupole accelerator has certain requirements on the beam size and beam envelope. Therefore, the present invention is used as a beam collimation and measurement device at the end of the low-energy transmission line, that is, before the entrance of the radio frequency quadrupole accelerator. A beam transformer is installed in the cavity of the device to measure the beam size. At the same time, the designed beam collimation and measurement cavity can make the beam after passing through the cavity meet the entrance beam quality requirements of the radio frequency quadrupole accelerator, so that the collimation cavity controls the quality of the particle beam to enter the rear functional cavity, such as the envelope, angle, etc., and those that do not meet the entry conditions are blocked.
[0021] The present invention provides Figure 1-3A beam transformer low-energy transmission line beam collimation and test cavity shown is used in BNCT, including a beam collimator cavity 2 and a cooling water path 6 installed through a front flange 1, one side of the front flange is fixedly connected to the beam collimator cavity 2, one side of the front flange 1 is fixedly connected to the beam collimator cavity 2, the outer wall of the beam collimator cavity 2 is sleeved with a beam collimator outer wall 3, the beam collimator cavity 2 is provided with a cooling component for cooling the beam collimator cavity 2, the cooling component includes a water inlet groove 4 opened at the top of the front flange 1, a water inlet pipe 5 for entering water flow is inserted and connected at the top of the water inlet groove 4, the outer wall of the beam collimator cavity 2 is provided with a cooling water path 6 for cooling the beam collimator cavity 2, and the cooling water path 6 is connected to the water inlet groove 4.
[0022] It should be noted that the beam collimator cavity 2 is set to be conical, and a conical hole is opened inside the cone. This setting ensures that only the beam that meets the taper and size of the beam collimator cavity 2 can enter the RF quadrupole accelerator, and the remaining beam is lost in the beam collimator cavity 2. A circular hole is opened on the front flange 1, and the size of the circular hole is consistent with that of one side of the conical hole. The water inlet pipe 5 is inserted at the top of the water inlet groove 4, so that after the cooling water enters the water inlet pipe 5, it enters the water inlet groove 4 through the water inlet pipe 5, and then enters the cooling water path 6 that runs through the water inlet groove 4.
[0023] Furthermore, this arrangement ensures that even if there is beam loss in the beam collimator, since cooling water enters the water inlet tank 4 through the water inlet pipe 5, and then the cooling water enters the cooling water path 6 that runs through the water inlet tank 4, the cooling water flows in the cooling water path 6 that is spirally arranged in the beam collimator cavity 2, thereby cooling the beam collimator cavity 2. This design ensures that the inner wall of the beam collimator cavity 2 is cooled sufficiently and evenly.
[0024] Specifically, a drainage assembly for discharging water from the cooling water channel 6 is provided at the bottom of the front flange 1. The outer wall 3 of the beam collimator is fixedly connected to one side of the front flange 1. The cooling water channel 6 is a conical spiral structure. The cone angle of the cooling water channel 6 is equal to the cone angle of the beam collimator inner cavity 2. The cross-section of the outer wall 3 of the beam collimator is convex.
[0025] It should be noted that by fixing the position of the beam collimator outer wall 3 on one side of the front flange 1 and setting a spiral cooling water path 6, the conical spiral angle of the cooling water path 6 is consistent with the conical angle of the beam collimator inner cavity 2, which can ensure uniform cooling of the beam collimator inner cavity 2.
[0026] Specifically, the drainage assembly includes a water outlet groove 7 provided at the bottom of the front flange 1 , a water outlet pipe 8 is inserted and connected to the bottom of the water outlet groove 7 , and the water outlet groove 7 and the cooling water channel 6 are interconnected.
[0027] Furthermore, after the cooling water enters the cooling water channel 6 , the cooling water is discharged from the cooling water channel 6 through the water outlet trough 7 that penetrates the cooling water channel 6 , and then the cooling water is discharged from the water outlet trough 7 through the water outlet pipe 8 .
[0028] Specifically, a flange connection tube 9 is fixedly connected to one side of the front flange 1, the beam collimator inner cavity 2 is inserted and connected to the middle of the flange connection tube 9, the beam collimator outer wall 3 is inserted and connected to the middle of the flange connection tube 9, and a rear flange 10 is fixedly connected to one side of the flange connection tube 9.
[0029] Specifically, a front end plate 11 for fixing the position of the rear flange 10 is provided on one side of the rear flange 10. The rear flange 10 is fixedly connected to the front end plate 11 by bolts. A gap 14 is provided between one side of the front end plate 11 and the side opposite to the beam collimator inner cavity 2 and the beam collimator outer wall 3.
[0030] Specifically, a beam transformer 12 is sleeved in the middle of the outer wall 3 of the beam collimator, and a positioning ring 13 for fixing the position of the beam transformer 12 is provided on one side of the beam transformer 12. The positioning ring 13 is sleeved in the middle of the outer wall 3 of the beam collimator, and the beam transformer 12 and the positioning ring 13 are both arranged inside the flange connecting tube 9.
[0031] It should be noted that the beam collimator outer wall 3 is sleeved on the outside of the beam collimator inner cavity 2, the beam collimator inner cavity 2 and the beam collimator outer wall 3 are airtightly welded at the tapered tail end by argon arc welding, and the beam collimator outer wall 3 and the front flange 1 are airtightly welded by argon arc welding to ensure that the cooling water flows in the entire water cooling pipeline without affecting the vacuum in the vacuum chamber; the beam transformer 12 is installed on the beam collimator outer wall 3 and fixed by a positioning ring 13, and a gap is left between the beam collimator inner cavity 2, the beam collimator outer wall 3 and the front end plate 11 of the radio frequency quadrupole accelerator. The gap design can ensure that the beam transformer 12 accurately measures the beam intensity.
[0032] The present invention claims a collimation and measurement device for a low-energy transmission particle line beam, and the collimation and measurement device comprises the beam transformer low-energy transmission line beam collimation.
[0033] The current technology still adopts the traditional cooling beam collimator, in which the middle part of the inner cavity is designed to be conical, so that the beam that meets the cone angle enters the radio frequency quadrupole accelerator, and the rest of the beam is blocked by the beam collimator. At the same time, part of the beam is lost in the beam collimator, causing the beam collimator to heat up. When the beam collimator is not sufficiently water-cooled, the beam collimator heats up and deforms, so that the quality of the beam passing through it cannot meet the requirements of the radio frequency quadrupole accelerator. The low-energy transmission line beam collimation of the beam transformer of the present invention adds an unnecessary The water inlet trough, water inlet pipe and cooling water path of the same structure, more specifically, innovatively introduce a new cooling water path, the cooling water enters the water inlet trough through the water inlet pipe, and the cooling water flows into the cooling water path through the water inlet trough, so that the inner cavity of the beam collimator is cooled by the cooling water path spirally arranged in the inner cavity of the beam collimator. This design ensures that the inner wall of the inner cavity of the beam collimator is cooled fully and evenly, and the gap design between the end of the inner cavity of the beam collimator and the rear front end plate ensures that the beam transformer can accurately measure the beam intensity passing through the beam transformer.
[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A collimation and measurement device for low energy transmission particle beam, characterized in that: The collimation and measurement device comprises a beam collimator cavity (2) and a cooling water path (6) installed through a front flange (1); one side of the front flange (1) is fixedly connected to the beam collimator cavity (2); the bottom of the front flange (1) is provided with a drainage component for discharging water inside the cooling water path (6); the outer wall of the beam collimator cavity (2) is sleeved with a beam collimator outer wall (3); the beam collimator cavity (2) is provided with a cooling component for cooling the beam collimator cavity (2); the cooling component comprises a water inlet groove (4) opened at the top of the front flange (1); the top of the water inlet groove (4) is connected with a water inlet pipe (5) for entering water flow; the outer wall of the beam collimator cavity (2) is provided with a cooling water path (6) for cooling the beam collimator cavity (2); the cooling water path (6) is connected with the water inlet groove (4).
2. The collimation and measurement device for low energy transmission particle beam according to claim 1, characterized in that: The beam collimator outer wall (3) is fixedly connected to one side of the front flange (1).
3. The collimation and measurement device for low energy transmission particle beam according to claim 1, characterized in that: The cooling water channel (6) is a conical spiral structure, the cone angle of the cooling water channel (6) is equal to the cone angle of the beam collimator inner cavity (2), and the cross section of the beam collimator outer wall (3) is convex.
4. The collimation and measurement device for low energy transmission particle beam according to claim 1, characterized in that: The drainage assembly comprises a water outlet groove (7) provided at the bottom of the front flange (1), a water outlet pipe (8) is inserted through the bottom of the water outlet groove (7), and the water outlet groove (7) and the cooling water channel (6) are interconnected.
5. The collimation and measurement device for low energy transmission particle beam according to claim 1, characterized in that: A flange connection pipe (9) is fixedly connected to one side of the front flange (1), and the beam collimator inner cavity (2) is inserted and connected to the middle part of the flange connection pipe (9).
6. The collimation and measurement device for low energy transmission particle beam according to claim 1, characterized in that: The outer wall (3) of the beam collimator is inserted and connected to the middle part of the flange connection pipe (9), and a rear flange (10) is fixedly connected to one side of the flange connection pipe (9).
7. The collimation and measurement device for low energy transmission particle beam according to claim 6, characterized in that: A front end plate (11) for fixing the position of the rear flange (10) is provided on one side of the rear flange (10), and the rear flange (10) is fixedly connected to the front end plate (11) by bolts.
8. The collimation and measurement device for low energy transmission particle beam according to claim 7, characterized in that: A gap (14) is provided between one side of the front end plate (11) and a side opposite to the inner cavity (2) and the outer wall (3) of the beam collimator.
9. The collimation and measurement device for low energy transmission particle beam according to claim 1, characterized in that: A beam transformer (12) is sleeved in the middle of the outer wall (3) of the beam collimator, a positioning ring (13) for fixing the position of the beam transformer (12) is provided on one side of the beam transformer (12), and the positioning ring (13) is sleeved in the middle of the outer wall (3) of the beam collimator.
10. The collimation and measurement device for low energy transmission particle beam according to claim 9, characterized in that: The beam current transformer (12) and the positioning ring (13) are both arranged inside the flange connection pipe (9).