WO2019056989A1

WO2019056989A1 - Energy selection system for superconducting proton apparatus and implementation method therefor

Info

Publication number: WO2019056989A1
Application number: PCT/CN2018/105717
Authority: WO
Inventors: 宋云涛; 郑金星; 支博; 江峰; 朱雷; 张午权; 韩曼芬; 王鹏彧; 李明; 曾宪虎; 王成
Original assignee: 合肥中科离子医学技术装备有限公司
Priority date: 2017-09-25
Filing date: 2018-09-14
Publication date: 2019-03-28
Also published as: CN107635348B; CN107635348A

Abstract

An energy selection system for a superconducting proton apparatus and an implementation method therefor. The energy selection system comprises: a degradation section A degrading an entered proton beam; a focusing and correction section B detecting the divergence of the beam, and feeding a signal back to a control system; a deflection section C enabling protons with larger divergence to radially deviate from a track to a larger extent; a secondary focusing section D enabling the beam to focus again at the section; and an energy selection section E preliminarily screening the beam. All of the components are respectively: a supporting base 1, an adjustment platform 2, a fixed lead-brass collimator 3, a pair of degraders 4 symmetrically mounted, a first vacuum chamber 5, a first mobile collimator 6, a fixed graphite collimator 7, a first beam detector 8, a second mobile collimator 9 and a second vacuum chamber.

Description

Superconducting proton device energy selection system and implementation method thereof

Technical field

The invention relates to the technical field of proton cyclotron energy selection device engineering, in particular to a superconducting proton device energy selection system and an implementation method thereof.

Background technique

Proton radiotherapy is currently the most recognized international radiotherapy technology. Unlike previous radiotherapy methods in which X-rays are used to "sand the birds", when protons are accelerated to about 70% of the speed of light via a synchrotron, proton rays are directed into the human body, and the tumor is "stereoscopic" at the moment of accurate arrival at the lesion. Directional blasting does not harm normal cells, "one soldier and one pawn", especially for recurrent and refractory malignant tumors such as head and neck, ophthalmology, chest, and digestive tract.

The energy selection system is a very important component in proton radiotherapy equipment. Proton therapy uses different energy protons according to the depth and thickness of the tumor itself, and the proton beam from the cyclotron is fixed at 200 MeV, so it needs to be in the accelerator and treatment. There is an energy selection system between the heads. The entire energy selection system consists of a graphite degrader, a fixed collimator, a moving collimator and a selection slit. The system also includes various magnets and corresponding beam detection devices and beam resistances required for particle optics. Equipment such as breakers.

The research and development status of energy selection systems is quite mixed. At present, there are more than a dozen production and research institutions abroad, and their technical products are currently in a state of confidentiality. The domestic market is still in a blank position; and the differences in product performance and shape of different manufacturers are relatively serious. It affects the standardized production of this product, which is not conducive to the promotion and application of equipment.

Application No. CN201480022491.8 discloses an energy-selective compact proton therapy system onboard a rotatable gantry comprising: a fixed particle accelerator configured to provide a particle beam; a beamline assembly coupled to the fixed particle An accelerator and operable to direct the particle beam along a first direction; an energy reducer operable to attenuate energy of the particle beam; and a rotating gantry assembly coupled to the beam assembly and including: a collection of bipolar magnets that control the magnetic field; and a collimator disposed between the sets of bipolar magnets; the fixed particle accelerator includes a superconducting cyclotron and is operable to provide the particle beam having 250 MeV.

Application No. CN201610616075.1 discloses a cyclotron-based proton therapy system comprising a proton cyclotron and a main proton beam transport system for transporting protons in a proton cyclotron, the main proton beam transport system passing the switch magnet The protons requiring energy are transmitted to the treatment rooms of three different paths, and the treatment rooms on the three different paths are the rotating frame treatment room and the horizontal beam and vertical beam double fixed beam treatment room arranged on both sides of the rotating frame treatment room and Horizontal beam and oblique beam double fixed beam treatment room.

The above prior art solutions disclose having an energy selective component and a proton beam transport system. In order to meet the current quality of the proton beam in the field and to meet the needs of the therapeutic end, a solution is now provided.

Summary of the invention

The object of the present invention is to provide a superconducting proton device energy selection system and an implementation method thereof, so as to meet the requirements of the trajectory, energy and divergence of the proton beam during proton radiotherapy.

The object of the present invention can be achieved by the following technical solutions:

A superconducting proton device energy selection system, the energy selection system comprising: energy reduction segment A: energy reduction, energy divergence and divergence adjustment of an incoming proton beam; focus correction segment B: divergence of beam current The degree is detected, the signal is fed back to the control system, the control system adjusts the magnitude of the magnetic field, and corrects the trajectory of the beam; the deflection segment C: the larger the divergence, the amplitude of the proton in the radial deviation from the center of the beam The larger the second focus segment D: the beam is again focused in the segment; the energy selection segment E: enables only the beam of the design center portion to pass, to achieve a preliminary screening of the beam.

The energy reduction section A comprises a support base, an adjustment platform, a fixed lead brass collimator, a symmetrically mounted pair of energy reducers, a vacuum chamber body 1, a moving collimator, a fixed graphite collimator, and a beam current detection. First, the moving collimator 2, the vacuum chamber 2; wherein the degrader includes a servo motor, a sliding platform, a connecting flange, a limit switch, a grating ruler, a bellows, a water-cooled tube, and an optional device; the servo motor Movement, through the timing belt and sliding platform drive connection, with the graphite movement at the front end of the movable energy option, the two damperly mounted energy reducers move simultaneously, adjusting the thickness of the graphite wedge in the direction of beam motion, thereby reducing the energy of the proton beam To the specified intensity, and through the detection and feedback of the limit switch and the grating ruler, the positioning of the graphite wedge is more precise. Fixed lead brass collimators and graphite collimators reduce the damage of the proton beam to subsequent components, increasing component life. The moving parts of the degrader are designed with a sophisticated control system that ensures the motion accuracy of the moving parts and adjusts the energy of the beam in a much smaller range. The moving parts of the moving collimator are designed with a precise control system to ensure the movement accuracy of the moving parts, to adjust the divergence of the beam in a smaller range, and the two moving collimators can be used according to the treatment. The demand is matched with a wider variety of divergence.

The focus correction segment B comprises a quadrupole iron one, a quadrupole iron two, a correction iron one and a beam current detector two; the beam detector two detects the motion trajectory of the beam current, and feeds the signal back to the computer control system to control The system adjusts the magnitude of the magnetic field by controlling the current intensity of the iron one, thereby realizing the correction of the beam motion trajectory.

The deflection section C is composed of a dipole iron, and the magnetic field of the dipole iron is a vertical upward uniform magnetic field. The protons are deflected inward by the Lorentz force in the horizontal direction in the magnetic field, and the protons with larger divergence are scattered. The amplitude of the radial deviation from the center of the beam is also greater. The control system is designed on the dipole iron. According to the different requirements of the proton beam in the transmission to the magnetic field, the control system can control the power supply to output the corresponding current, so that the magnet generates a corresponding magnetic field to transport the proton to the treatment end.

The secondary focus segment D comprises a quadrupole iron three, a quadrupole iron four, a correction iron two and a beam detector three. The magnet of the segment causes the beam to be focused again in the segment to avoid further divergence of the beam. Penetrate the tube wall and cause radiation.

The energy selection section E is composed of an energy selection slit. After the deflection of the C-stage secondary iron and the focus of the D-segment, the direction of motion has deviated from the center of the beam, and the deviation occurs when passing through the energy selection slit. The larger beam at the center will be blocked by the copper block, and only the beam at the center of the design can pass, thus achieving a preliminary screening of the beam and ensuring the quality of the beam.

The control system includes a degrader, a moving collimator, a beam detector, a moving collimator, an energy selection control system, a selection slit, a dipole iron, a quadrupole iron, a calibration iron, a vacuum gauge, and a molecule. Pump;

The energy selection control system includes a PLC controller, an industrial switch connected to the PLC controller through a data line, an industrial touch screen connected to the industrial switch through a data line, and a remote IO module connected to the industrial switch through the data line, and The switch of the industrial switch connected by the data line, the power source connected to the industrial switch through the data line, the vacuum gauge connected to the industrial switch through the data line, the molecular pump connected to the industrial switch through the data line, and the bundle connected to the industrial switch through the data line. Flow detector

The remote IO modules are respectively connected to a degrader, a selection slit, a moving collimator, and a moving collimator 2; the drivers are respectively connected to a degrader, a selection slit, and a moving collimator. The collimator 2; the power source is connected to the dipole iron, the quadrupole iron, and the correction iron, respectively.

The driver includes a driver 1, a driver 2, a driver 3, a driver 4, a driver 5, and a driver 6. The power source includes a power source 1, a power source 2, and a power source 3. The PLC controller is a safety PLC and can be constructed. Fail-safe system; the remote IO module is a secure I/O module that enables secure signal acquisition and communication.

The working process of the control system is: the beam detector sends the detected input energy value of the selected system to the PLC controller through the Ethernet, and the PLC controller sends the position value command through the Ethernet according to the set energy value. The energy reducer, the selection slit, the moving collimator, the moving collimator 2, the initial adjustment of the beam energy, the beam energy divergence, and the beam cross section, and the current value command is sent to the power source through the Ethernet, and the power supply is controlled. The pole iron realizes the beam deflection, the beam is focused by the power supply to control the quadrupole iron, and the direction of the proton beam is finely adjusted by the power supply control, and the beam detector sends the detected output energy value of the selected system to the PLC through the Ethernet. Monitors the beam output of the energy selection system and forms a feedback loop; the PLC controller vacuums the vacuum line through the Ethernet control molecular pump, and the vacuum gauge measures the vacuum inside the vacuum line and sends it to the PLC controller via Ethernet. monitor.

A method for implementing a superconducting proton device energy selection system, the method comprising the steps of:

After the proton beam enters the energy selection system, the energy and divergence are initially adjusted to the requirements required by the treatment end through the initial adjustment of the energy reducer and the moving collimator;

Through the detection of the beam detector, the position of the beam, the intensity of the beam and the size of the beam spot are observed from time to time, and fed back to the control system of the transport line;

The proton beam after the collimator is constrained to move on the specified trajectory by the deflection of the dipole iron, the focusing of the quadrupole iron, and the correction of the corrected iron to ensure stable transmission of the proton beam;

After the proton beam is deflected by the two-pole magnet, the protons with large divergence are also radially offset from the center of the beam. Therefore, a limiting slit is placed at the rear end of the dipole to enable off-center proton beam. Blocking absorption allows screening of the proton beam to meet the beam quality requirements at the treatment end.

The magnetic field generated by the above-mentioned quadrupole iron is a magnetic field whose gradient is constant, and its function is to focus the motion of the particle with the central orbit as the axis, and the magnitude of the focusing force is proportional to the magnetic field gradient. The quadrupole magnet is a punched-type stacked structure, usually composed of a core and a two-cake coil in a beam transmission line, and is mainly used for focusing and correcting the proton beam in the transmission line. The length of the fringe field of the quadrupole magnet varies with the change of the magnetic gap, and it is obvious that the end portion is slanted, and the center of the pole needs to be cut shorter than the edge. Performing straight edge shaving removes most of the center of the pole, and the closer to the edge, the less it is cut. The effect of this component can be attenuated by the sharpening of the end of the magnet. In order to increase the flexibility of adjustment during the adjustment and operation, all four-pole magnets are powered independently.

The dipole iron adopts the field type symmetry of the H-type magnet, which is suitable for working in the high field area, and the symmetrical structure makes the mechanical stability relatively high. The finite width of the magnetic pole face, that is, the uniformity of the magnetic field required for the good field region, requires that each side of the magnetic pole extends a distance in the width of the good field region to solve the problem that the magnetic leakage at the edge of the magnet air gap and the magnetic field edge magnetic field decrease. The magnet coils are designed with a water-cooling system, which can dissipate the heat generated during operation in a timely manner, which is stable in the whole system.

The beneficial effects of the invention: a superconducting proton device energy selection system and an implementation method thereof according to the invention can adjust the energy and divergence of the proton beam, and screen the quality of the proton beam to satisfy the therapeutic end. demand.

DRAWINGS

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a top plan view of the overall structure of the present invention;

Figure 2 is a perspective view showing the overall structure of the present invention;

Figure 3 is a structural view of a section A of the structure of the present invention;

Figure 4 is a perspective view of the A section of the structure of the present invention;

Figure 5 is a structural view of the energy reducer in the A section of the structure of the present invention;

Figure 6 is a perspective view of the control system of the present invention.

Preferred embodiment of the invention

The technical solutions of the present invention will be described clearly and completely hereinafter with reference to the embodiments. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

A superconducting proton device energy selection system and an implementation method thereof are shown in Figures 1, 2, 3 and 4, and the A segment is a reduced energy segment, which comprises all the components shown in Fig. 3, respectively being support bases 1. Adjusting platform 2, fixed lead brass collimator 3, symmetrically mounted pair of energy reducers 4, vacuum chamber body 5, moving collimator one 6, fixed graphite collimator 7, beam detector one, Moving the collimator 2, the vacuum chamber 2;

The proton beam enters the energy selection system. When the lead-lead collimator 3 is fixed, the secondary particles in the beam and the proton beam far away from the center can be blocked and absorbed, thereby reducing the damage of the downstream components. . After the fixed lead brass collimator 3 filters and collimates the protons through the graphite layer of the degrader 4, the beam current is blocked and absorbed, so that the overall energy of the beam is reduced, and the graphite thickness is large. The reduced energy is large, and different energy reductions can be obtained with different thicknesses.

As shown in FIG. 5, the energy reducer 4 includes a servo motor 401, a sliding platform 402, a connecting flange 403, a limit switch 404, a grating scale 405, a bellows 406, a water-cooling tube 407, and an optional component 408; After the accelerator extracts the proton beam of fixed energy into the energy selection system, by adjusting the thickness of the graphite layer of the degrader, a proton beam continuously adjustable in a certain energy intensity range can be obtained at the output end; the process is: according to the treatment The need for the general control room to issue a command to control the movement of the servo motor 401 of the degrader, through the timing belt and the sliding platform 402 drive connection, the graphite movement of the front end of the movable option 408, the two energy reducers 4 installed symmetrically Movement, adjusting the thickness of the graphite wedge in the direction of beam motion, thereby reducing the energy of the proton beam to a specified intensity, and the positioning of the graphite wedge is more accurate through the detection feedback of the limit switch 404 and the grating ruler 405. In turn, the value of the proton beam energy reduction is more accurate.

The fixed lead brass collimator 3 is fixed to the front end of the vacuum chamber body 5 by bolts, and two degraders 4 are symmetrically mounted on the front and rear sides of the vacuum chamber body 5. The core working parts of the degrader are inside the vacuum chamber The power unit (servo motor 401) and the transmission unit (synchronous belt, ball screw and linear guide) are placed outside the vacuum chamber, and are separated from the vacuum inside by the bellows 406, and the servo motor outside the bellows is passed. The timing belt pulley and the timing belt are connected with the sliding platform 402. The sliding platform drives the bellows to move, thereby pushing the steel tube inside the bellows. The sliding platform 402 is equipped with a grating ruler 405 and a limit switch 404. The entire motion control system adopts closed-loop control. In order to ensure the accuracy of the movement and the safety of the work. Inside the bellows 406, the connecting flange 403 is connected with the working part inside the steel tube vacuum chamber, and the steel pipe is connected with the outside atmosphere. The steel pipe has an inlet and outlet water cooling pipe 407, which is in contact with the internal working parts to form a water cooling system, thereby ensuring system operation. The heat balance at the time.

The moving collimator (6, 9) is similar in structure to the degrader. The core working part is made of lead brass and has four tapered holes of different sizes. The part can be moved up and down, and the working part is Inside the vacuum chamber; the moving collimator also uses a bellows to isolate the working part from the power transmission unit, and the external motor drives the sliding table through the timing belt to push the bellows to move; the limit switch is mounted on the sliding table to ensure the movement Safety; because the movable collimator does not move very often, semi-closed loop control is still used to meet the design accuracy requirements. The inlet and outlet pipes are also designed in the bellows to form a water cooling system with the working parts.

Fixed graphite collimator 7, the main working part is a cylinder made of graphite material, the center of which is machined with a tapered hole, which can control the divergence of the beam while eliminating the secondary particles, reducing the proton beam to the surrounding Damage to the components; the graphite body is mounted on the fixed bracket and positioned by the positioning pin. The bracket is mounted on the bottom plate of the vacuum chamber. The upper part of the graphite body has a positioning groove, and a spring device is installed inside, and the spring is pressed by the upper cover plate. It is in close contact with the bracket to achieve three dimensional positioning.

The vacuum chamber body 5 is welded by stainless steel material, and the front and rear end faces are welded with a vacuum quick connection pipe diameter to facilitate connection with the pipe. The vacuum chamber 2 is also welded by stainless steel, and a beam detector 8 and a moving collimator 2 are sequentially arranged inside, and a beam detector 8 is mounted on the upper cover of the vacuum chamber, and multi-wire ionization is used. The chamber (MWIC) method measures the position and divergence of the beam and feeds back the signal to the correcting magnet in the transport line to maintain accurate beam position. Wherein, the multi-wire ionization chamber can be moved up and down, and the steel pipe sealed inside the bellows is connected with an external power device to realize vacuum dynamic sealing. The moving collimator 2 inside the vacuum chamber 2 and the moving collimator in the vacuum chamber have the same structure and function. The two collimators can be used together to realize various combinations of proton beam divergence. Provide more options for the treatment side.

The support base 1 mainly plays the role of support and leveling. The base is welded by carbon steel. Three horns are installed at the lower end to adjust the level of the whole device, so that the whole support device is in a horizontal state; It is placed on the support base 1 and supports the two energy reducers to be symmetrically mounted. The whole is welded by stainless steel and used together with the above-mentioned adjustment plate, so that the energy reducer is generally in a horizontal state, which can better meet the work requirements.

The incident proton beam is scattered as it passes through the energy reducer, resulting in a discrete distribution of beam energy, spatial position and direction of motion, energy distribution (energy divergence), spatial position and motion direction distribution (ie, divergence). During the passage of the particles, a nuclear reaction occurs, resulting in secondary particles, causing certain particle loss and radiation. Therefore, a fixed graphite collimator 7 is installed downstream of the degrader 4 and the moving collimator 6. The above-mentioned radiation particles can be absorbed and shielded to protect other components in the system from being damaged by the irradiated particles.

A moving collimator 6 and a moving collimator 2 are mounted on the two vacuum chambers, and the core working part is a copper core with a tapered hole. Different apertures can make the proton beam spatial position and movement direction. The distribution is different, the moving collimator 6 and the moving collimator 2 are used together to obtain more beams with different divergence protons; the beam detector 8 can detect the position and divergence of the proton beam from time to time. And feedback the signal to the control center, and control the movement of the degrader 4 and the moving collimator 6 through the control system, thereby further adjusting the proton beam flow, and the whole system strokes a closed-loop control system, which can make the working state of the system More precise and stable.

After the proton beam is adjusted by energy reduction, divergence and divergence, it enters segment B; segment B is the focus correction segment, and segment B contains quadrupole iron, quadrupole iron II, corrected iron one, and beam detector II. . The proton beam moves in the magnetic field and is subjected to the Lorentz force of the magnetic field. The direction of the force is directed to the center of the beam, thereby constraining the proton beam from further diverging; the beam detector in segment B can be directed to the beam. The divergence is detected, and the signal is fed back to the computer control system. The control system adjusts the magnitude of the magnetic field by controlling the current intensity of the iron one, thereby realizing the correction of the beam motion trajectory.

The C segment of the energy selection system is a deflection segment, and the C segment is mainly composed of a dipole iron. The magnetic field of the dipole iron is a vertical upward uniform magnetic field, and the proton is deflected inward by a Lorentz force in the horizontal direction in the magnetic field. The larger the divergence, the greater the amplitude of the protons that deviate radially from the center of the beam;

Therefore, a D-segment device is installed in the rear section of C. The D-segment is a secondary focusing segment, and the D-segment includes a quadrupole iron three, a quadrupole iron four, a correction iron two and a beam detector three. The D segment magnet can make a beam. The flow is again focused in the segment to avoid further divergence of the beam, penetrating the tube wall and causing radiation.

Section E is the energy selection section, which is mainly composed of energy selection slits. After the deflection of the secondary iron of the C section and the proton beam after the focusing of the D section, the direction of motion has deviated from the center of the beam, and the energy selection slit is passed. The beam that is off-center will be blocked by the copper block, and only the beam at the center of the design can pass, thus achieving preliminary screening of the beam and ensuring the quality of the beam.

The selection slit mainly comprises a vacuum chamber body 3 and its supporting mechanism, a transmission mechanism, an electric cylinder and an e-block; a KF80 flange is arranged on the front and rear end faces of the vacuum chamber body for connection of the beam pipe. Horizontal (X-direction) and vertical (Y-direction) angular supports are symmetrically mounted on the outer wall of the four sides of the vacuum chamber; an electric cylinder and a transmission mechanism are mounted on the angular support on each side; and the inner wall of the four sides of the vacuum chamber is provided with Corresponding emperor. The transmission mechanism includes an oil-free bushing, a moving link, a bellows and an electric cylinder connecting block, and a G10 connecting block. The two ends of the electric cylinder connecting block are respectively screwed with the moving connecting rod and the electric cylinder, and the specified linear displacement is realized by the electric cylinder driving the e-block, and the structure has the characteristics of compact space and high transmission efficiency. The G10 connecting block is used to connect the moving link and the buck, and transmits the linear displacement to the buck. The G10 material is used for insulation. The oil-free bushing is mounted on the inner wall of the vacuum chamber for fixing the moving link; the bellows sleeve is placed outside the oil-free bushing for maintaining a certain working vacuum inside the vacuum chamber. A current lead is installed in the opening of the buck, and an aviation socket interface is reserved on the vacuum cavity for detecting the current generated by the working state.

Section F in Figure 1 is a vacuum system consisting of a vacuum chamber 4, a sealing device and a vacuum component. Its main function is to provide a stable vacuum environment for the system to prevent other particles of the air from interfering with the proton beam. The vacuum chamber system is designed to ensure the vacuum environment of the energy selection system, so that the proton beam always moves in the vacuum environment, reducing the influence of tiny particles in the air on the proton beam, thus ensuring the quality of the beam and the beam to the device. The accuracy of the adjustment.

As shown in FIG. 6, the entire contents shown in the control system block diagram are, in turn, a degrader 4, a moving collimator 6, a beam detector 17, a moving collimator 2, an energy selection control system 10, and a selection slit. 11, dipole iron 12, quadrupole iron 13, calibration iron 14, vacuum gauge 15, molecular pump 16;

The energy selection control system includes a PLC controller 1001, an industrial switch 1003 connected to the PLC controller 1001 via the data line 1014, an industrial touch screen 1002 connected to the industrial switch 1003 via the data line 1014, and an industrial switch 1003 through the data line 1014. The connected remote IO module 1004, the driver connected to the industrial switch 1003 via the data line 1014, the power source connected to the industrial switch 1003 via the data line 1014, the vacuum meter 15 connected to the industrial switch 1003 via the data line 1014, and the industrial switch 1003 a molecular pump 16 connected to the data line 1014, and a beam detector 17 connected to the industrial switch 1003 via the data line 1014;

The remote IO module 1004 is connected to the degrader 4, the selection slit 11, the moving collimator 6, and the moving collimator 2, respectively; the driver is connected to the degrader 4, the selection slit 11, and Moving the collimator 6 and moving the collimator 2; the power supply is respectively connected to the dipole iron 12, the quadrupole iron 13 and the correction iron 14;

The drive comprises a driver 1005, a driver two 1006, a driver three 1007, a driver four 1008, a driver five 1009, a driver six 1010; the power supply comprises a power supply 1011, a power supply 2102, a power supply three 1013;

The PLC controller 1001 is a safety type PLC capable of constructing a fail-safe system; the remote IO module 1004 is a secure I/O module capable of achieving secure signal acquisition and communication.

The beam detector 17 includes a beam detector 1, a beam detector 2, and a beam detector 3. The quadrupole 13 includes a quadrupole iron, a quadrupole iron, a quadrupole iron, and a quadrupole iron. The correction iron 14 includes a correction iron one and a correction iron two.

The preferred embodiments of the invention disclosed above are merely illustrative of the invention. The preferred embodiments are not to be considered in all detail, and the invention is not limited to the specific embodiments. Obviously, many modifications and variations are possible in light of the teachings herein. The present invention has been chosen and described in detail to explain the embodiments of the invention and the invention. The invention is to be limited only by the scope of the appended claims and the appended claims.

Industrial applicability

The main working principle of the energy selection control system of the present invention is that the input energy value of the detected energy selection system of the beam current detector is sent to the PLC controller through the Ethernet, and the PLC controller passes the set energy value according to the set value. The Ethernet sends a position value command to the degrader, the selection slit, the moving collimator, the moving collimator 2, the initial adjustment of the beam energy, the beam energy divergence, and the beam cross section, and the current value command is transmitted through the Ethernet. To the power supply, the beam deflection is realized by the power control bipolar iron, the beam focusing is realized by the power supply controlling the quadrupole iron, the direction of the proton beam is corrected by the power supply control, and the output energy of the selected system can be selected by the beam detector. The value is sent to the PLC controller via Ethernet, monitors the beam output of the energy selection system, and forms a feedback loop; the PLC controller vacuums the vacuum line through the Ethernet control molecular pump, and the vacuum gauge measures the vacuum inside the vacuum line and passes Ethernet is sent to the PLC controller for monitoring. PLC controller and industrial touch screen realize data exchange by means of industrial switch and data line; industrial touch screen is a human-computer interaction and control device, which realizes setting, storing and displaying related parameters, and monitors system operation status and prompts fault information. And can display the control area information as a picture image.

Claims

A superconducting proton device energy selection system, characterized in that the energy selection system comprises:

Energy-reducing section A: adjustment of the energy, divergence and divergence of the incoming proton beam;

Focus correction segment B: detecting the divergence of the beam, feeding back the signal to the control system, and the control system adjusts the magnitude of the magnetic field to correct the trajectory of the beam;

Deflection section C: the larger the divergence, the greater the amplitude of the protons that deviate radially from the center of the beam;

Secondary focus segment D: focusing the beam again in the segment;

Energy Selection Segment E: A preliminary screening of the beam is achieved by allowing only the beam at the design center to pass.
The superconducting proton device energy selection system according to claim 1, wherein the energy reduction section A comprises a support base, an adjustment platform, a fixed lead brass collimator, and a symmetrically mounted pair of energy reducers. a vacuum chamber, a moving collimator, a fixed graphite collimator, a beam detector, a moving collimator, a vacuum chamber 2, wherein the degrader includes a servo motor, a sliding platform, and a connection method. Blue, limit switch, grating ruler, bellows, water-cooled tube, optional; servo motor movement, through the timing belt and sliding platform drive connection, with the graphite movement at the front end of the kinetic energy option, the two energy reducers installed symmetrically The movement adjusts the thickness of the graphite wedge in the direction of the beam motion, thereby reducing the energy of the proton beam to a specified intensity, and the positioning of the graphite wedge is more accurate through the detection and feedback of the limit switch and the grating ruler.
The superconducting proton device energy selection system according to claim 1, wherein the focus correction segment B comprises a quadrupole iron, a quadrupole iron II, a correction iron one, and a beam current detector 2; The detector 2 detects the motion trajectory of the beam, and feeds the signal back to the computer control system. The control system adjusts the magnitude of the magnetic field by controlling the current intensity of the iron one, thereby realizing the correction of the beam motion trajectory.
The superconducting proton device energy selection system according to claim 1, wherein the deflection section C is composed of a dipole iron, and the magnetic field of the dipole iron is a vertical upward uniform magnetic field, and the proton is in the magnetic field. It is deflected inward by the Lorentz force in the horizontal direction, and the larger the divergence, the larger the amplitude of the protons that deviate from the center of the beam in the radial direction.
The superconducting proton device energy selection system according to claim 1, wherein the secondary focus segment D comprises a quadrupole iron three, a quadrupole iron four, a correction iron two and a beam current detector three, The segment's magnet causes the beam to focus again in that segment.
A superconducting proton device energy selection system according to claim 1, wherein said energy selection section E is composed of an energy selective slit, and the proton after the deflection of the C segment secondary iron and the focusing of the D segment. Beam current, when passing through the energy selection slit, the beam that deviates from the design center will be blocked by the copper block, and only the beam at the center of the design can pass, thus achieving preliminary screening of the beam and ensuring the quality of the beam. .
The superconducting proton device energy selection system according to claim 1, wherein the control system comprises a degrader, a moving collimator, a beam detector, a moving collimator, and an energy selection control. System, selection slit, dipole iron, quadrupole iron, calibration iron, vacuum gauge, molecular pump;

The energy selection control system includes a PLC controller, an industrial switch connected to the PLC controller through a data line, an industrial touch screen connected to the industrial switch through a data line, and a remote IO module connected to the industrial switch through the data line, and The switch of the industrial switch connected by the data line, the power source connected to the industrial switch through the data line, the vacuum gauge connected to the industrial switch through the data line, the molecular pump connected to the industrial switch through the data line, and the bundle connected to the industrial switch through the data line. Flow detector

The remote IO modules are respectively connected to a degrader, a selection slit, a moving collimator, and a moving collimator 2; the drivers are respectively connected to a degrader, a selection slit, and a moving collimator. The collimator 2; the power source is connected to the dipole iron, the quadrupole iron, and the correction iron, respectively.
The superconducting proton device energy selection system according to claim 7, wherein the driver comprises a driver 1, a driver 2, a driver 3, a driver 4, a driver 5, and a driver 6. The power source includes a power source. 1. Power supply 2 and power supply 3; The PLC controller is a safety type PLC capable of constructing a fail-safe system; the remote IO module is a safe I/O module, which can realize safe signal acquisition and communication.
A superconducting proton device energy selection system according to claim 7, wherein said control system operates in that: the beam detector transmits the detected input energy value of the selectable system to the Ethernet via Ethernet. The PLC controller and the PLC controller send position value commands to the degrader, the selection slit, the moving collimator, and the moving collimator according to the set energy value, and initially adjust the beam energy and the beam energy. Divergence and beam cross section, send current value command to power supply through Ethernet, beam deflection through power supply control bipolar iron, beam focusing through power supply quadrupole iron, iron fine tuning proton beam direction through power supply control, beam The flow detector sends the detected output energy value of the selected system to the PLC controller through the Ethernet, monitors the beam output of the energy selection system, and forms a feedback loop; the PLC controller controls the vacuum pump through the Ethernet control molecular pump. Vacuum, the vacuum gauge measures the vacuum inside the vacuum line and sends it to the PLC controller for monitoring via Ethernet.
A method for implementing a superconducting proton device energy selection system, characterized in that the implementation method comprises the following steps:

After the proton beam enters the energy selection system, the energy and divergence are initially adjusted to the requirements required by the treatment end through the initial adjustment of the energy reducer and the moving collimator;

Through the detection of the beam detector, the position of the beam and the size of the beam spot are observed from time to time and fed back to the control system of the transport line;

The proton beam after the collimator is constrained to move on the specified trajectory by the deflection of the dipole iron, the focusing of the quadrupole iron, and the correction of the corrected iron to ensure stable transmission of the proton beam;

After the proton beam is deflected by the two-pole magnet, the protons with large divergence are also radially offset from the center of the beam. Therefore, a limiting slit is placed at the rear end of the dipole to enable off-center proton beam. Blocking absorption allows screening of the proton beam to meet the beam quality requirements at the treatment end.