Adjustable beam slit device close to circular shape
阅读说明：本技术 一种接近圆形的可调整束流狭缝装置 (Adjustable beam slit device close to circular shape ) 是由 黄鹏 宋国芳 安世忠 李鹏展 侯世刚 曹磊 于 2019-11-02 设计创作，主要内容包括：本发明公开了一种接近圆形的可调整束流狭缝装置,该束流狭缝装置可用于直流束流切割装置、且安装在直流束流切割装置的束流切割器极板之后,也可安装在加速器束流传输系统中；所述可调整束流狭缝装置包括狭缝头部的两个直角开口大小相同、相对而设的直角挡块、一个同时驱动狭缝头部两个直角挡块的驱动机构、及位置检测反馈装置；所述同时驱动狭缝头部两个直角挡块的驱动机构由狭缝端PLC控制器控制,整个装置通过狭缝端PLC控制器集成到加速器控制系统中。本发明实现了束流脉宽连续变化的过程中,束流狭缝始终接近圆形,从而最大限度地保证了束流的聚集效果,使得束流通过狭缝时被分散掉的束流达到最小,提高了束流流强和传输的束流品质。(The invention discloses a nearly circular adjustable beam slit device, which can be used for a direct current beam cutting device, is arranged behind a beam cutter polar plate of the direct current beam cutting device, and can also be arranged in an accelerator beam transmission system; the adjustable beam slit device comprises two right-angle stop blocks which are opposite and have the same size on the slit head, a driving mechanism for simultaneously driving the two right-angle stop blocks on the slit head, and a position detection feedback device; the driving mechanism for simultaneously driving the two right-angle stop blocks at the head of the slit is controlled by the slit end PLC controller, and the whole device is integrated into an accelerator control system through the slit end PLC controller. The invention realizes that the beam slit is always close to a circle in the process of continuously changing the beam pulse width, thereby ensuring the beam aggregation effect to the maximum extent, minimizing the beam scattered when the beam passes through the slit, and improving the beam intensity and the transmitted beam quality.)
1. A nearly circular adjustable beam slit device, the beam slit device can be used for the direct current beam cutting device, and is installed behind the beam cutter polar plate of the direct current beam cutting device, also can be installed in the beam transmission system of the accelerator; the method is characterized in that: the adjustable beam slit device comprises two right-angle stop blocks which are opposite and have the same size on the slit head, a driving mechanism for simultaneously driving the two right-angle stop blocks on the slit head, and a position detection feedback device; the driving mechanism for simultaneously driving the two right-angle stop blocks at the head part of the slit is controlled by a slit end PLC controller, and the whole adjustable beam slit device is integrated into an accelerator control system through the slit end PLC controller and then is remotely controlled by a master control PLC of the accelerator.
2. The adjustable near circular beam slit apparatus of claim 1, wherein: the two right-angle stoppers of the slit head are arranged in a manner of being attached to each other front and back, the two right-angle stoppers are identical in shape and are both in a right-angle opening shape, and the opening parts are oppositely arranged to form a square opening to be close to a circle; under the action of an alternating electric field of a beam cutting polar plate, deflection at the beam generating position is realized, only particle beams with small deflection angles can pass through the openings of the two slit right-angle stop blocks, so that the conversion from direct current beams to pulse beams is realized, and the final pulse width of the pulse beams and the total number of particles passing through the slit head are realized by adjusting the sizes of the openings of the two right-angle stop blocks at the slit head; the adjustable beam slit device enables a beam to have a better focusing effect when the beam passes through the slit head and approaches the round opening, and the adjustable beam slit device can dynamically change or adjust the size of the opening of the slit head which approaches the round opening.
3. The adjustable near circular beam slit apparatus of claim 1, wherein: the driving mechanism and the position detection feedback device comprise a stepping motor with electromagnetic brake, a motor driver, a set of transmission device and a potentiometer used for position feedback; the transmission device comprises a bidirectional screw rod, two right-angle stop blocks and two travel limit protection switches, wherein the bidirectional screw rod is used for driving the two right-angle stop blocks at the head of the slit to move oppositely; the stepping motor drives the two right-angle stop blocks of the slit head to move synchronously through the transmission device, and the motion range of the two right-angle stop blocks of the slit head is limited through the stroke limit protection switch; and the position detection feedback device is used for feeding back the position information of the slit head to the slit end PLC control system for carrying out closed-loop control on the slit position.
4. The adjustable near circular beam slit apparatus of claim 1, wherein: the position detection feedback device adopts a linear potentiometer to feed back the position information of the slit head, and the positioning precision of the adjustable beam slit device is within 0.1 mm; the maximum size of the square opening at the head of the slit is 30 multiplied by 30mm, and the narrowest square opening can be completely closed; the two right-angle stoppers at the head part of the slit are closely mounted front and back, the gap is required to be as small as possible, the two right-angle stoppers are closely attached to each other as possible without friction, and the maximum gap is required to be not more than 1 mm; the right-angle block at the head of the slit is made of T2 red copper, and other parts are made of materials without special requirements; the sealing position can adopt rubber sealing, fluorine rubber sealing ring or metal sealing.
Technical Field
The invention belongs to the field of cyclotrons, and particularly relates to a near-circular adjustable beam slit device.
Background
In a beam pulse system, a beam cutter is utilized to form a continuous direct current beam into a pulse beam with an ultra-short time structure and width, and the pulse beam based on the ultra-short time structure has very important application in the fields of nuclear data measurement, nuclear physical tests and other researches. The adjustable beam slit device is one of indispensable devices of a beam pulse system. Meanwhile, the beam slit device is widely applied to the aspects of beam current intensity and section control and adjustment in the field of accelerators, in particular to the precise beam current transmission process of proton treatment and certain specific experiments with strict requirements on beam current shape and current intensity.
Disclosure of Invention
The invention provides a nearly circular adjustable beam slit device aiming at the defects of the prior art and aims to solve the problems that a beam cluster is dispersed when a pulse beam passes through a slit and the beam loss is caused after particles enter an accelerator due to a strip-shaped beam slit of a beam selection device in the prior art.
The invention adopts the following technical scheme for solving the technical problems:
a nearly circular adjustable beam slit device, the beam slit device can be used for the direct current beam cutting device, and is installed behind the beam cutter polar plate of the direct current beam cutting device, also can be installed in the beam transmission system of the accelerator; the method is characterized in that: the adjustable beam slit device comprises two right-angle stop blocks which are opposite and have the same size on the slit head, a driving mechanism for simultaneously driving the two right-angle stop blocks on the slit head, and a position detection feedback device; the driving mechanism for simultaneously driving the two right-angle stop blocks at the head part of the slit is controlled by a slit end PLC controller, and the whole adjustable beam slit device is integrated into an accelerator control system through the slit end PLC controller and then is remotely controlled by a master control PLC of the accelerator.
The two right-angle stoppers of the slit head are arranged in a manner of being attached to each other front and back, the two right-angle stoppers are identical in shape and are both in a right-angle opening shape, and the opening parts are oppositely arranged to form a square opening to be close to a circle; under the action of an alternating electric field of a beam cutting polar plate, deflection at the beam generating position is realized, only particle beams with small deflection angles can pass through the openings of the two slit right-angle stop blocks, so that the conversion from direct current beams to pulse beams is realized, and the final pulse width of the pulse beams and the total number of particles passing through the slit head are realized by adjusting the sizes of the openings of the two right-angle stop blocks at the slit head; the adjustable beam slit device enables a beam to have a better focusing effect when the beam passes through the slit head and approaches the round opening, and the adjustable beam slit device can dynamically change or adjust the size of the opening of the slit head which approaches the round opening.
The driving mechanism and the position detection feedback device comprise a stepping motor with electromagnetic brake, a motor driver, a set of transmission device and a potentiometer used for position feedback; the transmission device comprises a bidirectional screw rod, two right-angle stop blocks and two travel limit protection switches, wherein the bidirectional screw rod is used for driving the two right-angle stop blocks at the head of the slit to move oppositely; the stepping motor drives the two right-angle stop blocks of the slit head to move synchronously through the transmission device, and the motion range of the two right-angle stop blocks of the slit head is limited through the stroke limit protection switch; and the position detection feedback device is used for feeding back the position information of the slit head to the slit end PLC control system for carrying out closed-loop control on the slit position.
The position detection feedback device adopts a linear potentiometer to feed back the position information of the slit head, and the positioning precision of the adjustable beam slit device is within 0.1 mm; the maximum size of the square opening at the head of the slit is 30 multiplied by 30mm, and the narrowest square opening can be completely closed; the two right-angle stoppers at the head part of the slit are closely mounted front and back, the gap is required to be as small as possible, the two right-angle stoppers are closely attached to each other as possible without friction, and the maximum gap is required to be not more than 1 mm; the right-angle block at the head of the slit is made of T2 red copper, and other parts are made of materials without special requirements; the sealing position can adopt rubber sealing, fluorine rubber sealing ring or metal sealing.
Advantages and effects of the invention
1. According to the invention, the two slit right-angle stoppers are oppositely installed through 90-degree openings, are closely installed in the front and the back, and have the requirement that the maximum gap between the front and the back cannot exceed 1mm, the motor drives the two-way screw rod, the two-way screw rod drives the two slit right-angle stoppers to move in the opposite directions, and the travel switch limits the moving positions of the two slit right-angle stoppers, so that the sizes of the openings of the two slit right-angle stoppers are maximally set to be 30 multiplied by 30mm, and the narrowest parts can be completely closed, thereby realizing that the slit of the beam is always close to a circle in the process of continuously changing the pulse width of the beam, further ensuring the focusing effect of the beam to the maximum extent, minimizing the dispersed beam when the beam passes through the slit.
2. The invention solves the technical problem that the beam slit is always in a linear shape, so that most of the beam on the circular section of the beam slit is intercepted by the stop block and wasted when the beam passes through the slit. The invention breaks through the habitual thinking of people, namely the habitual thinking that the width and the width of beam slits are distributed on a plane in two motion directions, so that only one linear slit is formed for a long time; the invention uses two planes of three-dimensional space to form an approximate plane, and uses two open right-angle shapes to form a graph which is closest to a circle, thereby solving the technical problem that the circular beam slit can not realize for a long time in the field, obtaining unexpected effects and generating a leap from quantitative change to qualitative change.
3. The invention skillfully combines the two-way screw rod and the motor, realizes that one motor drives two right-angle stop blocks at the head part of the slit to synchronously move, and compared with the method of adopting two motors to respectively drive one stop block to move in the prior art, the invention saves one motor, a motor driver and a mechanical transmission device which are matched with the motor, and a control mechanism for controlling the synchronous movement of the two motors, and finally reduces the whole volume of the beam slit device by nearly two thirds, effectively simplifies the installation and maintenance, and obtains unexpected effects.
Drawings
FIG. 1 is a schematic view of a prior art beam cutting apparatus;
FIG. 2 is a schematic diagram of the application effect of the beam slit apparatus according to the present invention;
FIG. 2a is an enlarged view of area A of FIG. 2;
FIG. 2b is an enlarged view of a portion of FIG. 2;
in the figure, 1: a feed-in port; 2: a
Detailed Description
Design principle of the invention
1. The design difficulty of the circular beam slit. The beam slit is designed to be circular, but the beam selection device not only allows the beam to pass, but also needs to dynamically change the size of the beam gap to generate pulse widths with different widths, if the beam selection device is designed to be a round hole slit, when the pulse width needs to be enlarged, the round hole slit is a red copper component, and the red copper component does not have elasticity and cannot stretch, the original red copper round hole slit needs to be divided into a plurality of parts along the circumference and then distributed on the enlarged circumference, and the original radian is not suitable for a new radian, and the shape of the enlarged beam slit does not keep the circular shape any more. The circular beam slit is difficult to realize, so that in the prior art, two cuboid copper plates are used as baffles, a slit between the cuboid copper plates is used as a beam selection slit, and the cuboid copper plates are used as the beam baffles, so that the circular beam slit is generally adopted due to the fact that the manufacturing is easy and the process is simple. However, the strip beam slits formed by the cuboid copper plate baffle plate enable the beam cross section passing through the slits to be relatively divergent, so that the beam is lost too much when entering the accelerator for acceleration, and the efficiency of the accelerator is reduced.
2. The square beam slit is closest to a circle. Compared with other shapes, the slit hole channel only with the square shape closest to the circular shape can still be maintained after the slit gap is enlarged. The square hole channel is formed by butt joint of two opposite right-angle baffles with right-angle shapes, a bidirectional screw rod is adopted to connect the two right-angle baffles respectively, when the square hole needs to be reduced, the bidirectional screw rod drives the two right-angle baffles to move oppositely and alternately, when the square hole needs to be enlarged, the bidirectional screw rod drives the two right-angle baffles to move back until the opening size reaches 30 multiplied by 30mm, the process is controlled by travel switches 11-6-1 and 11-6-2, and therefore, no matter the square hole is enlarged or reduced, the square slit always keeps the square shape, namely, the square slit always keeps the shape which is closest to the circular shape.
Based on the principle of the invention, the invention designs the adjustable beam slit device which is approximately round.
An adjustable beam slit device that is nearly circular is shown in fig. 2, which can be used in a dc beam cutting device and is installed behind a beam cutter plate of the dc beam cutting device; the method is characterized in that: as shown in fig. 2a and 2b, the adjustable beam slit device includes two right-angle stoppers 11-2 opposite to each other and having the same size of the two right-angle openings of the slit head, a driving mechanism for simultaneously driving the two right-angle stoppers of the slit head, and a position detection feedback device; the driving mechanism for simultaneously driving the two right-angle stop blocks at the head part of the slit is controlled by a slit end PLC controller, and the whole adjustable beam slit device is integrated into an accelerator control system through the slit end PLC controller and then is controlled by a master control PLC of the accelerator.
As shown in fig. 2, 2a and 2b, two right-angle stoppers 11-2 at the head part of the slit are arranged in a manner of being attached to each other front and back, the two right-angle stoppers 11-2 are identical in shape and are both in a right-angle opening shape, and the opening parts are arranged oppositely to form a square opening to be close to a circle; under the action of an alternating electric field of a beam cutting polar plate, deflection at the beam generating position is realized, only particle beams with small deflection angles can pass through the openings of the two slit right-angle stop blocks, so that the conversion from direct current beams to pulse beams is realized, and the final pulse width of the pulse beams and the total number of particles passing through the slit head are realized by adjusting the sizes of the openings of the two right-angle stop blocks at the slit head; the adjustable beam slit device enables a beam to have a better focusing effect when the beam passes through the slit head and approaches the round opening, and the adjustable beam slit device can dynamically change or adjust the size of the opening of the slit head which approaches the round opening.
As shown in fig. 2a, the driving mechanism and the position detection feedback device comprise a stepping motor 11-3 with electromagnetic brake, a motor driver 11-4 and a set of transmission device, and further comprise a potentiometer 11-5 used for position feedback; the transmission device comprises a bidirectional screw rod 11-1, the bidirectional screw rod 11-1 is used for driving two right-angle stop blocks 11-2 of the slit head to move oppositely or reversely, and the transmission device also comprises two stroke limit protection switches (11-6-1 and 11-6-2); the stepping motor 11-3 drives the two right-angle stoppers 11-2 of the slit head to synchronously move through a transmission device, and limits the movement range of the two right-angle stoppers of the slit head through stroke limit protection switches (11-6-1 and 11-6-2); and the position detection feedback device is used for feeding back the position information of the slit head to the slit end PLC control system for carrying out closed-loop control on the slit position.
The position detection feedback device adopts a linear potentiometer to feed back the position information of the slit head, and the positioning precision of the adjustable beam slit device is within 0.1 mm; the maximum size of the square opening at the head of the slit is 30 multiplied by 30mm, and the narrowest square opening can be completely closed; the two right-angle stoppers at the head part of the slit are closely mounted front and back, the gap is required to be as small as possible, the two right-angle stoppers are closely attached to each other as possible without friction, and the maximum gap is required to be not more than 1 mm; the right-angle block at the head of the slit is made of T2 red copper, and other parts are made of materials without special requirements; the sealing position can adopt rubber sealing, fluorine rubber sealing ring or metal sealing.
The direct current beam cutting device is shown in fig. 2, and comprises a spiral resonator, a beam cutting polar plate device and a beam selecting slit system; the spiral resonator is used for providing high-frequency voltage for the beam cutting polar plate, the beam cutting polar plate device is used for providing an alternating electric field for beam passing and beam deflection, and the beam selection slit device is used for cutting the beam in cooperation with the cutting polar plate so as to generate pulse beam with corresponding pulse width; the resonator is a small resonator, and the small resonator is a capacitance trimming polar plate with the fixed natural frequency of the spiral resonator accurately; the beam of the beam selection slit system passes through the approximate circular cross section which can enable the beam focusing effect to be better and can dynamically change the shape and the size.
The adjustable beam slit device which is approximately circular can be applied to a system for forming direct current beams into pulse beams, can also be applied to the adjustment and control of beam intensity and beam cross section in the beam transmission process related to an accelerator, and can also be applied to the automatic adjustment process of beams in the experiment process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
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