A stripping target for cyclotron beam extraction and a beam extraction method

Abstract

The present invention discloses a new type of stripping target and beam extraction method for cyclotron beam extraction, wherein the stripping target includes: a fixing part, including a vacuum chamber window cover, a motor support connected to one side of the vacuum chamber window cover, and an aluminum alloy support frame connected to the other side of the vacuum chamber window cover; further comprising: a driving part connected to the fixing part, driving the sliding part to slide along a predetermined stroke; a sliding part connected to the driving part, driving the swinging part to swing, causing the stripping film to move and changing the beam extraction trajectory; and a swinging part connected to the sliding part. The present invention simplifies the stripping target structure while being able to effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation to quickly realize stripping and extracting a proton beam. The stripping target has a simple structure, low manufacturing cost, and a short manufacturing cycle, and is therefore adaptable to some special, experimental, and temporary operating conditions.

Description

Technical Field

[0001] The present invention relates to a stripping target, in particular to a stripping target for cyclotron beam extraction and a beam extraction method. Background Art

[0002] Since the first cyclotron was used for physics experiments in 1932, compact, high-intensity proton cyclotrons based on stripping extraction have made significant progress and found widespread application, particularly in nuclear medicine. According to the International Atomic Energy Agency, over 1,300 compact, high-intensity proton cyclotrons are in use in nuclear medicine worldwide. The most common stripping extraction cyclotrons are those that accelerate H⁻, D⁻, and H⁺⁻ particles. These systems extract proton beams by stripping electrons from accelerated ions using a stripping membrane.

[0003] However, due to the limited space inside the cyclotron and the obstruction of the magnetic yoke outside the vacuum chamber, the installation space and movement distance of the stripping target are both restricted. Furthermore, in order to achieve precise adjustment of the stripping film position and multi-dimensional directional control, a complex system structure is often required. This requires sufficient design time, trial and error experience, and production costs, while also considering the feasibility of installation, maintenance, and disassembly.

[0004] A fixed beam extraction radius corresponds to the same extraction energy. For cyclotron accelerators with low beam extraction energy and fixed energy, the stripping target structure can be simplified to quickly achieve stripping and extraction of the proton beam. This is especially true for some special, experimental, and temporary operating conditions, such as when the required beam energy is low and the beam stripping point is at a fixed but far distance from the vacuum chamber wall.

[0005] Therefore, for the above-mentioned application scenarios, research on the new cyclotron stripping target system can reduce the production cost and installation difficulty of the stripping target and improve work efficiency, which has far-reaching significance for the research and development of various operating conditions experiments of domestic cyclotrons. Summary of the Invention

[0006] Purpose of the invention: To provide a stripping target and a beam extraction method for cyclotron beam extraction, so as to solve the above-mentioned problems existing in the prior art.

[0007] Technical solution: A stripping target for cyclotron beam extraction, comprising:

[0008] A fixing member, comprising a vacuum chamber window cover plate, a motor support connected to one side of the vacuum chamber window cover plate, and an aluminum alloy support frame connected to the other side of the vacuum chamber window cover plate;

[0009] Also includes:

[0010] A driving member connected to the fixing member, configured to drive the sliding member to slide along a predetermined stroke;

[0011] The sliding member is connected to the driving member and is used to drive the swing member to swing, so as to move the stripping film and thus change the beam extraction trajectory;

[0012] The swinging member is connected to the sliding member and comprises a connecting rod assembly connected to the sliding member and a stripping film frame arranged at the end of the connecting rod assembly.

[0013] The present invention simplifies the stripping target structure while being able to effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation to quickly realize stripping and extracting a proton beam. The stripping target has a simple structure, low production cost, and short production cycle, and is therefore suitable for some special, experimental, and temporary operating conditions, such as when the required beam energy is low and the beam stripping point is far away from the vacuum chamber wall but fixed.

[0014] At the same time, for cyclotron accelerators with fixed extraction positions, the size of the connecting rod assembly can be obtained by knowing the beam stripping point and the vacuum chamber installation position, and then the production can be completed in a short time. The mechanical structure is simple and not prone to failure, and can effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation.

[0015] Easy to install, the overall structure takes up little space, the number of accessories is small, and installation and disassembly can be completed by one person;

[0016] The component itself does not require additional gap avoidance for the magnetic yoke, vacuum chamber or magnetic poles, fully utilizes the gap between the magnetic poles, maximizes the height of the stripping film, and makes a higher probability of contact between the beam and the stripping film, and the beam extraction efficiency is high.

[0017] Good vacuum sealing and few leak detection points;

[0018] The vacuum sealing surface of the stripping target only includes a magnetic fluid seal and a vacuum chamber cover seal, which can meet the vacuum requirements of the cyclotron.

[0019] The method is effectively applicable to low beam energy cyclotron accelerators where the distance between the beam stripping point and the vacuum chamber window is large.

[0020] In a further embodiment, the driving member comprises:

[0021] A servo motor is mounted on the motor support;

[0022] The output end of the servo motor has an output shaft, the output shaft is connected to a coupling, the coupling is connected to a magnetic fluid main shaft, and the magnetic fluid main shaft passes through the window cover and the aluminum alloy support frame.

[0023] In a further embodiment, the sliding member comprises:

[0024] A screw rod is coaxially connected to the magnetic fluid main shaft;

[0025] Tin bronze slider, sleeved on the screw rod;

[0026] The switch bracket is connected to the aluminum alloy support frame;

[0027] The travel switch is arranged on the travel switch bracket and is used to limit the sliding stroke of the tin bronze slider.

[0028] In a further embodiment, the connecting rod assembly comprises:

[0029] Connecting rod A, hinged to the tin bronze slider;

[0030] Connecting rod B is hinged to connecting rod A through a pin, and the connection between connecting rod A, connecting rod B and the pin is insulated by a ceramic spacer;

[0031] The connecting rod bracket has one end connected to the aluminum alloy support frame and the other end hinged to the end of the connecting rod B away from the connecting rod A;

[0032] The stripping film frame is connected to one end of the connecting rod B away from the connecting rod A.

[0033] In a further embodiment, a ceramic sleeve and a ceramic gasket are provided between the connection between the connecting rod bracket and the aluminum alloy support frame, and insulation is achieved through the ceramic sleeve and the ceramic gasket.

[0034] In a further embodiment, a magnetic fluid seal is further provided in the aluminum alloy support frame.

[0035] A beam extraction method for a stripping target used for cyclotron beam extraction, comprising:

[0036] Step 1: Install the stripping target and perform insulation treatment at the same time;

[0037] Step 2. After the installation is completed, the servo motor drives the output shaft to rotate, so that the coupling drives the magnetic fluid main shaft to rotate, drives the lead screw to rotate, and makes the tin bronze slider slide, which in turn drives the connecting rod A and the connecting rod B to swing, and then drives the stripping film frame to swing, so that the stripping film also moves, thereby changing the beam extraction trajectory.

[0038] In a further embodiment, when installing the stripping target, the installation method is affected by the space outside the cyclotron, including:

[0039] There is a reserved opening installation method. When there is a reserved opening on the magnetic yoke outside the installation window, the stripping target can be installed in advance and then extended radially from the window as a whole, and positioned and installed through the vacuum chamber window cover;

[0040] Installation method without reserved opening: When there is no reserved opening for the magnetic yoke outside the installation window, connect the aluminum alloy support frame, magnetic fluid, lead screw, limit switch, and vacuum chamber window cover in advance, and then install them as a whole from the vacuum chamber window radially. Secondly, install connecting rod A, connecting rod B, connecting rod bracket and stripping film frame inside the vacuum chamber, and finally install the servo motor outside the vacuum chamber.

[0041] In a further embodiment, wiring is performed after the overall installation is completed, and the wires are led out through other reserved outlets of the vacuum chamber;

[0042] All components from the aluminum alloy support frame to the stripping film direction should be suspended in the air without direct contact with the magnetic pole surface;

[0043] After installation, the servo motor outside the vacuum chamber is fixed to the vacuum chamber window cover through the motor support. The motor output shaft is directly connected to the magnetic fluid main shaft through a coupling. The magnetic fluid main shaft is coaxial with the lead screw and passes through the vacuum chamber window cover and the aluminum alloy support frame.

[0044] In a further embodiment, during the insulation treatment, the pin connection between the connecting rod A and the connecting rod B is insulated by designing a ceramic spacer, and the connecting rod bracket and the aluminum alloy support frame are insulated by designing a ceramic spacer and a ceramic gasket;

[0045] Finally, the peeling film transmits the electrical signal to the connecting rod B and the connecting rod bracket, and the beam measuring motor is connected to the connecting rod bracket.

[0046] Beneficial effects: The present invention discloses a stripping target and a beam extraction method for cyclotron beam extraction. By designing a swinging part to drive the stripping film frame to move, the stripping target structure is simplified to quickly realize the stripping and extraction of the proton beam while being able to effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation. The stripping target has a simple structure, low production cost, and short production cycle, and is therefore suitable for some special, experimental, and temporary operating conditions. For example, when the required beam energy is low, the beam stripping point is far away from the vacuum chamber wall but fixed.

[0047] At the same time, for cyclotron accelerators with fixed extraction positions, the size of the connecting rod assembly can be obtained by knowing the beam stripping point and the vacuum chamber installation position, and then the production can be completed in a short time. The mechanical structure is simple and not prone to failure, and can effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation.

[0048] Easy to install, the overall structure takes up little space, the number of accessories is small, and installation and disassembly can be completed by one person;

[0049] The component itself does not require additional gap avoidance for the magnetic yoke, vacuum chamber or magnetic poles, fully utilizes the gap between the magnetic poles, maximizes the height of the stripping film, and makes a higher probability of contact between the beam and the stripping film, and the beam extraction efficiency is high.

[0050] Good vacuum sealing and few leak detection points;

[0051] The vacuum sealing surface of the stripping target only includes a magnetic fluid seal and a vacuum chamber cover seal, which can meet the vacuum requirements of the cyclotron.

[0052] The method is effectively applicable to low beam energy cyclotron accelerators where the distance between the beam stripping point and the vacuum chamber window is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural schematic diagram of the present invention.

[0054] Figure 2 It is a schematic diagram of the extraction trajectory of the cyclotron after the target beam is stripped by the present application.

[0055] Figure 3 It is a schematic flow chart of the method of the present invention.

[0056] The accompanying drawings are:

[0057] 1. Servo motor; 2. Motor support; 3. Coupling; 4. Vacuum chamber window cover; 5. Aluminum alloy support frame; 6. Magnetic fluid seal; 7. Screw; 8. Tin bronze slider; 9. Travel switch; 10. Switch bracket; 11. Connecting rod A; 12. Connecting rod B; 13. Connecting rod bracket; 14. Stripping film frame; 15. Pin. DETAILED DESCRIPTION

[0058] The present application relates to a stripping target and a beam extraction method for cyclotron beam extraction, which are explained in detail below through specific implementation methods.

[0059] The stripping target is the core device for controlling the beam extraction of the cyclotron. By remotely operating the motor, the relevant mechanical structure is driven to control the stripping film to reach the specified position, correct the proton beam extraction trajectory, and finally successfully extract the proton beam at the corresponding vacuum chamber window.

[0060] Stripping extraction principle: In the development of cyclotron accelerator, stripping extraction method is an important extraction method to obtain high-current proton beam;

[0061] The basic principle is to set an electron stripping membrane on the ion orbit of the corresponding energy. When the negative ions pass through the electron stripping membrane, the electrons are stripped away and they become positive ions with different ionic charge states. Then, as the orbital curvature reverses or becomes significantly different from the central orbit, only the central ions are selected by the accelerator's own strong magnetic field and are extracted from the accelerator.

[0062] The position of the stripping film is a key factor in determining the extraction point of the proton beam. Even a slight change in the rotation radius at a specific energy will cause a huge change in the extraction trajectory of the proton beam in the magnetic field after the stripping. When the cyclotron is running to emit the beam, it is impossible to ensure that the beam trajectory corresponding to the initial position of the stripping film is directly facing the extraction window of the vacuum chamber. Therefore, the stripping target system is needed to control the position of the stripping film and correct the beam extraction trajectory. Figure 2 The stripping target is installed in a new 16MeV medical cyclotron. The schematic diagram of the extraction trajectory of the cyclotron beam after stripping corresponds to the experimental working condition of the stripping target installation with an extracted beam energy of 4Me.

[0063] The main transmission mode of the stripping target proposed by the present invention is composed of a sliding part driven by a screw pair and a swinging part driven by a connecting rod mechanism.

[0064] The screw pair consists of a magnetic fluid main shaft and a tin bronze slider. The magnetic fluid main shaft is directly connected to the servo motor to convert rotational motion into linear motion.

[0065] The connecting rod mechanism consists of a connecting rod B made of brass and a connecting rod A made of aluminum alloy, which are fixed to the connecting rod bracket and tin bronze slider respectively, and connected to each other through titanium alloy pins to convert linear motion into planar rotation.

[0066] The stripping film is fixed to the aluminum alloy stripping film frame, which is directly connected to the brass connecting rod and rotates with the connecting rod.

[0067] Insulation and beam measuring wires are provided on connecting rod B and connecting rod A to realize the beam signal detection function.

[0068] The travel limit function is achieved through the travel switch.

[0069] The beam measuring wires and the travel switch wires are led out through other reserved outlets of the vacuum chamber.

[0070] The overall sealing points include magnetic fluid seals and vacuum chamber window cover seals.

[0071] This application is applicable to situations where the cyclotron beam extraction radius is fixed, that is, the extracted beam energy is fixed; the beam stripping point can be located in the middle of the magnetic field, and is applicable to situations where the stripping point is far away from the vacuum chamber window;

[0072] The structure is simple and the design and production is quick. It is suitable for experimental occasions where temporary change of beam extraction energy is required, especially low energy.

[0073] A stripping target for cyclotron beam extraction, comprising:

[0074] A fixing member, comprising a vacuum chamber window cover plate, a motor support connected to one side of the vacuum chamber window cover plate, and an aluminum alloy support frame connected to the other side of the vacuum chamber window cover plate;

[0075] Also includes:

[0076] A driving member connected to the fixing member, configured to drive the sliding member to slide along a predetermined stroke;

[0077] The sliding member is connected to the driving member and is used to drive the swing member to swing, so as to move the stripping film and thus change the beam extraction trajectory;

[0078] The swinging member is connected to the sliding member and comprises a connecting rod assembly connected to the sliding member and a stripping film frame arranged at the end of the connecting rod assembly.

[0079] The present invention simplifies the stripping target structure while being able to effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation to quickly realize stripping and extracting a proton beam. The stripping target has a simple structure, low production cost, and short production cycle, and is therefore suitable for some special, experimental, and temporary operating conditions, such as when the required beam energy is low and the beam stripping point is far away from the vacuum chamber wall but fixed.

[0080] At the same time, for cyclotron accelerators with fixed extraction positions, the size of the connecting rod assembly can be obtained by knowing the beam stripping point and the vacuum chamber installation position, and then the production can be completed in a short time. The mechanical structure is simple and not prone to failure, and can effectively realize multiple functions such as stripping, beam measurement, limiting, and insulation.

[0081] Easy to install, the overall structure takes up little space, the number of accessories is small, and installation and disassembly can be completed by one person;

[0082] The component itself does not require additional gap avoidance for the magnetic yoke, vacuum chamber or magnetic poles, fully utilizes the gap between the magnetic poles, maximizes the height of the stripping film, and makes a higher probability of contact between the beam and the stripping film, and the beam extraction efficiency is high.

[0083] Good vacuum sealing and few leak detection points;

[0084] The vacuum sealing surface of the stripping target only includes a magnetic fluid seal and a vacuum chamber cover seal, which can meet the vacuum requirements of the cyclotron.

[0085] The method is effectively applicable to low beam energy cyclotron accelerators where the distance between the beam stripping point and the vacuum chamber window is large.

[0086] The driving member includes:

[0087] A servo motor is mounted on the motor support;

[0088] The output end of the servo motor has an output shaft, the output shaft is connected to a coupling, the coupling is connected to a magnetic fluid main shaft, and the magnetic fluid main shaft passes through the window cover and the aluminum alloy support frame.

[0089] The sliding member comprises:

[0090] A screw rod is coaxially connected to the magnetic fluid main shaft;

[0091] The tin bronze slider is sleeved on the screw rod. The travel of the tin bronze slider is set with the soft limit of the travel switch and the hard limit of the bolt designed on the switch bracket;

[0092] The switch bracket is connected to the aluminum alloy support frame. A notch is provided on the top of the switch bracket for the sliding of the tin bronze slider. The tin bronze slider extends outside the notch on the top of the switch bracket and is connected to the connecting rod A.

[0093] In order to make the tin bronze slider slide more smoothly, a sliding groove can be opened on the side of the tin bronze slider and the inner wall with a groove on the top of the switch bracket, and the tin bronze slider and the inner wall with a groove on the top of the switch bracket are adapted to slide.

[0094] The travel switch is arranged on the travel switch bracket and is used to limit the sliding stroke of the tin bronze slider.

[0095] The connecting rod assembly comprises:

[0096] Connecting rod A is hinged to the tin bronze slider by a pin, and two copper rollers are installed at the connection to tighten and assist the slider in linear motion;

[0097] Connecting rod B is hinged to connecting rod A through a pin, and the connection between connecting rod A, connecting rod B and the pin is insulated by a ceramic spacer;

[0098] The connecting rod bracket has one end connected to the aluminum alloy support frame and the other end hinged to the end of the connecting rod B away from the connecting rod A;

[0099] The stripping film frame is connected to one end of the connecting rod B away from the connecting rod A.

[0100] A ceramic sleeve and a ceramic gasket are provided between the connection portion of the connecting rod bracket and the aluminum alloy support frame, and insulation is achieved through the ceramic sleeve and the ceramic gasket.

[0101] A magnetic fluid seal is also provided in the aluminum alloy support frame.

[0102] A beam extraction method for a stripping target used for cyclotron beam extraction, comprising:

[0103] Step 1: Install the stripping target and perform insulation treatment at the same time;

[0104] Step 2. After the installation is completed, the servo motor drives the output shaft to rotate, so that the coupling drives the magnetic fluid main shaft to rotate, drives the lead screw to rotate, and makes the tin bronze slider slide, which in turn drives the connecting rod A and the connecting rod B to swing, and then drives the stripping film frame to swing, so that the stripping film also moves, thereby changing the beam extraction trajectory.

[0105] When installing the stripping target, the installation method is affected by the space outside the cyclotron, including:

[0106] There is a reserved opening installation method. When there is a reserved opening on the magnetic yoke outside the installation window, the stripping target can be installed in advance and then extended radially from the window as a whole, and positioned and installed through the vacuum chamber window cover;

[0107] Installation method without reserved opening: When there is no reserved opening for the magnetic yoke outside the installation window, connect the aluminum alloy support frame, magnetic fluid, lead screw, limit switch, and vacuum chamber window cover in advance, and then install them as a whole from the vacuum chamber window radially. Secondly, install connecting rod A, connecting rod B, connecting rod bracket and stripping film frame inside the vacuum chamber, and finally install the servo motor outside the vacuum chamber.

[0108] After the overall installation is completed, wiring is carried out and the wires are led out through other reserved outlets in the vacuum chamber;

[0109] All components from the aluminum alloy support frame to the stripping film direction should be suspended in the air without direct contact with the magnetic pole surface;

[0110] After installation, the servo motor outside the vacuum chamber is fixed to the vacuum chamber window cover through the motor support. The motor output shaft is directly connected to the magnetic fluid main shaft through a coupling. The magnetic fluid main shaft is coaxial with the lead screw and passes through the vacuum chamber window cover and the aluminum alloy support frame.

[0111] During insulation treatment, the pin connection between connecting rod A and connecting rod B is insulated by designing a ceramic spacer, and the connecting rod bracket and the aluminum alloy support frame are insulated by designing a ceramic spacer and ceramic gasket;

[0112] Finally, the peeling film transmits the electrical signal to the connecting rod B and the connecting rod bracket, and the beam measuring motor is connected to the connecting rod bracket.

[0113] Insulation principle:

[0114] The pin connection between connecting rod A and connecting rod B is insulated by designing a ceramic spacer, and the connecting rod bracket and the aluminum alloy support frame are insulated by designing a ceramic spacer and a ceramic gasket. Finally, the stripping film can transmit the electrical signal to connecting rod B and the connecting rod bracket, and the beam measurement motor is connected to the connecting rod bracket.

[0115] Installation method:

[0116] The installation method is affected by the space outside the cyclotron. If there is a reserved opening on the magnetic yoke outside the installation window, the stripping target can be installed in advance and then extended radially from the window as a whole, and positioned and installed through the vacuum chamber window cover.

[0117] If there is no reserved opening for the magnetic yoke outside the installation window, you can first connect the aluminum alloy support frame, magnetic fluid, lead screw, limit switch, and vacuum chamber window cover in advance, and then install them as a whole from the vacuum chamber window radially, and then install the connecting rod A, connecting rod B, connecting rod bracket and stripping film frame inside the vacuum chamber, and finally install the servo motor outside the vacuum chamber.

[0118] After the overall installation is completed, wiring is carried out and the wires are led out through other reserved outlets in the vacuum chamber.

[0119] All components from the aluminum alloy support frame to the inside should be suspended in the air and have no direct contact with the magnetic pole surface.

[0120] The stripping film is a pure titanium film with dimensions of 16 mm in height, 19 mm in width and 1 μm in thickness. It is sandwiched between two stripping film frames made of aluminum alloy and fixed to the head of connecting rod B by tightening bolts, making it easy to disassemble and replace the stripping film.

[0121] The peeling area after installation is 14mm high and 15mm wide.

[0122] Working principle description: The servo motor outside the vacuum chamber is fixed to the vacuum chamber window cover through the motor support. The motor output shaft is directly connected to the magnetic fluid main shaft through a coupling. The magnetic fluid main shaft is coaxial with the lead screw and passes through the vacuum chamber window cover and the aluminum alloy support frame.

[0123] The servo motor drives the output shaft to rotate, causing the coupling to drive the magnetic fluid main shaft to rotate, driving the lead screw to rotate, causing the tin bronze slider to slide, and then driving the connecting rod A and connecting rod B to swing, and then driving the stripping film frame to swing, causing the stripping film to move accordingly, thereby changing the beam extraction trajectory.

[0124] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A stripping target for cyclotron beam extraction, comprising: A fixing member, comprising a vacuum chamber window cover plate, a motor support connected to one side of the vacuum chamber window cover plate, and an aluminum alloy support frame connected to the other side of the vacuum chamber window cover plate; It is characterized by further comprising: A driving member connected to the fixing member, configured to drive the sliding member to slide along a predetermined stroke; The sliding member is connected to the driving member and is used to drive the swing member to swing, so that the stripping film moves, thereby changing the beam extraction trajectory; the sliding member includes: a screw rod coaxially connected to the magnetic fluid main shaft; a tin bronze slider sleeved on the screw rod; a switch bracket connected to the aluminum alloy support frame; a travel switch is provided on the travel switch bracket for limiting the sliding travel of the tin bronze slider; The swinging member is connected to the sliding member and includes: a connecting rod assembly connected to the sliding member, and a stripping film frame provided at the end of the connecting rod assembly; the connecting rod assembly includes: a connecting rod A, hinged to the tin bronze slider; a connecting rod B, hinged to the connecting rod A, and the hinge is completed by a pin, and the connection between the connecting rods A, B and the pin is insulated by a ceramic spacer; a connecting rod bracket, one end of which is connected to the aluminum alloy support frame and the other end is hinged to the end of the connecting rod B away from the connecting rod A; the stripping film frame is connected to the end of the connecting rod B away from the connecting rod A; A ceramic sleeve and a ceramic gasket are provided between the connection portion of the connecting rod bracket and the aluminum alloy support frame, and insulation is achieved through the ceramic sleeve and the ceramic gasket.

2. The stripping target for cyclotron beam extraction according to claim 1, characterized in that: The driving member includes: A servo motor is mounted on the motor support; The output end of the servo motor has an output shaft, the output shaft is connected to a coupling, the coupling is connected to a magnetic fluid main shaft, and the magnetic fluid main shaft passes through the window cover and the aluminum alloy support frame.

3. The stripping target for cyclotron beam extraction according to claim 1, characterized in that: A magnetic fluid seal is also provided in the aluminum alloy support frame.

4. A beam extraction method for a stripping target for cyclotron beam extraction, based on the stripping target for cyclotron beam extraction according to any one of claims 1 to 3, characterized in that: include: Step 1: Install the stripping target and perform insulation treatment at the same time; Step 2. After the installation is completed, the servo motor is used to drive the output shaft to rotate, so that the coupling drives the magnetic fluid main shaft to rotate, drives the lead screw to rotate, and makes the tin bronze slider slide, which in turn drives the connecting rod A and the connecting rod B to swing, and then drives the stripping film frame to swing, so that the stripping film also moves, thereby changing the beam extraction trajectory.

5. The beam extraction method for a stripping target for cyclotron beam extraction according to claim 4, characterized in that: When installing the stripping target, the installation method is affected by the space outside the cyclotron, including: There is a reserved opening installation method. When there is a reserved opening on the magnetic yoke outside the installation window, the stripping target is installed in advance and then extended radially from the window as a whole, and positioned and installed through the vacuum chamber window cover. Installation method without reserved opening: When there is no reserved opening for the magnetic yoke outside the installation window, connect the aluminum alloy support frame, magnetic fluid, lead screw, limit switch, and vacuum chamber window cover in advance, and then install them as a whole from the vacuum chamber window radially. Secondly, install connecting rod A, connecting rod B, connecting rod bracket and stripping film frame inside the vacuum chamber, and finally install the servo motor outside the vacuum chamber.

6. A beam extraction method for a stripping target for cyclotron beam extraction according to claim 5, characterized in that: After the overall installation is completed, wiring is carried out and the wires are led out through the wire outlet reserved in the vacuum chamber; All components from the aluminum alloy support frame to the stripping film direction should be suspended in the air without direct contact with the magnetic pole surface; After installation, the servo motor outside the vacuum chamber is fixed to the vacuum chamber window cover through the motor support. The motor output shaft is directly connected to the magnetic fluid main shaft through a coupling. The magnetic fluid main shaft is coaxial with the lead screw and passes through the vacuum chamber window cover and the aluminum alloy support frame.

7. The beam extraction method for a stripping target used for cyclotron beam extraction according to claim 6, characterized in that: During insulation treatment, the pin connection between connecting rod A and connecting rod B is insulated by designing a ceramic spacer, and the connecting rod bracket and the aluminum alloy support frame are insulated by designing a ceramic spacer and ceramic gasket; Finally, the peeling film transmits the electrical signal to the connecting rod B and the connecting rod bracket, and the beam measuring motor is connected to the connecting rod bracket.

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