A beam blocking device and control system for a radiation zone of a high-current accelerator

Abstract

This invention relates to a beam blocking device and control system for the radiation region of a high-current accelerator. The beam blocking device includes a mounting cavity and blocking elements. The blocking elements include a shielding iron assembly, a blocking target assembly, and a drive mechanism. The shielding iron assembly is fixed in the mounting cavity, and the blocking target assembly is located within the mounting cavity. The drive mechanism is connected to the blocking target assembly and drives the blocking target assembly to reciprocate linearly in a horizontal direction perpendicular to the beam injection direction. Two sets of blocking elements are provided in the mounting cavity, and the two sets of blocking elements are symmetrically distributed on both sides of the beam injection direction. The control system includes a motion control system and an electronics-data acquisition system. This invention utilizes two independent blocking elements that can move independently to open and close the entire blocking device, thereby achieving beam blocking in different ranges of the high-current beam in the radiation region, and extends the service life of external electrical components by utilizing the shielding iron assembly.

Description

Technical Field

[0001] This invention relates to the field of accelerator technology, and more specifically to a beam blocking device and control system for the radiation region of a high-current accelerator. Background Technology

[0002] The High Intensity Heavy-ion Accelerator Facility (HIAF) is one of the major national scientific engineering projects. Its High Energy Radiation Separator (HFRS) generates a secondary beam by bombarding a target with a high-energy, high-intensity heavy-ion beam. The beam blocker operates along the HFRS radioactive beamline, blocking beams in different ranges depending on experimental requirements. During experiments, the vast majority of the beam is lost at this location, making this region highly radioactive. Calculations show that the instantaneous dose rate of the secondary radiation field generated in the high-radiation region can reach 10-1. 12 The extremely high levels of radioactivity, in the μSv / h range, can damage electronic components on the detector target. Equipment such as motors cannot operate in this area for long periods and require frequent replacement.

[0003] Within the accelerator's radioactive beam tunnel, the surface residual dose rate of highly activated components can reach 10. 6 The beam density is on the order of μSv / h, which prevents operators from entering the high-radiation environment for maintenance and equipment replacement for a long period after shutdown. Personnel can only enter after a long cooling period and the radiation dose rate has decreased to a low level. This results in abnormally low accelerator operating efficiency. Since the electronic components and vacuum measurement equipment on the equipment are affected by strong radioactivity, effectively blocking the beam and ensuring more stable and reliable operation of the equipment in the radiation zone is of great significance. Therefore, it is urgent to design a beam blocking device that can be used in high-radiation environments. This device must be stable, reliable, have strong radiation resistance, be easy to hoist and replace, and ensure the normal operation of the accelerator. Summary of the Invention

[0004] The purpose of this invention is to provide a beam blocking device and control system for the radiation region of a high-current accelerator, so as to solve the problems of easy damage to electronic components and low operating efficiency of accelerators in the ultra-strong radioactive environment in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a beam blocking device for the radiation region of a high-current accelerator, comprising:

[0007] The mounting cavity has a flange interface on its wall that connects to the accelerator beam pipe;

[0008] The blocking element includes a shielding iron assembly, a blocking target assembly, and a driving mechanism. The shielding iron assembly is fixed in the mounting cavity, and the blocking target assembly is located in the mounting cavity below the shielding iron assembly. The driving mechanism is mounted on the mounting cavity and connected to the blocking target assembly, and is used to drive the blocking target assembly to reciprocate linearly in the horizontal direction in a direction perpendicular to the beam injection direction.

[0009] Two sets of blocking elements are provided in the mounting cavity, and the two sets of blocking elements are symmetrically distributed on both sides of the beam injection direction.

[0010] Furthermore, a first flange interface for beam injection is provided on the front cavity wall of the mounting cavity, and a second flange interface for beam ejection is provided on the rear cavity wall of the mounting cavity. The first flange interface and the second flange interface are arranged opposite to each other, and the first flange interface and the second flange interface form a beam flow path within the mounting cavity.

[0011] Furthermore, the top of the mounting cavity is provided with an assembly port for inserting the blocking element. The blocking element also includes a sealing flange, which is located above the mounting cavity, covering the assembly port and connected to the top of the shielding iron assembly, for sealing the assembly port by the weight of the shielding iron assembly.

[0012] Furthermore, a lifting device is fixed to the top of the sealing flange.

[0013] Furthermore, the drive mechanism includes an external drive mechanism and an internal transmission mechanism;

[0014] The external drive mechanism is located above the mounting cavity and mounted on the sealing flange. It includes a base, a transmission assembly, a motor, a bellows, and a transmission rod. The base is fixed to the top of the sealing flange. The transmission assembly includes a lead screw and a first slider that matches the lead screw. The lead screw is vertically rotatably connected to the base. The motor is fixed to the top of the base, and the output end of the motor is connected to the lead screw. The transmission rod is located inside the mounting cavity. Its top end passes through the sealing flange and is connected to the first slider. Its bottom end passes through the shielding iron assembly and is connected to the internal transmission mechanism. The bellows is located above the sealing flange and is sleeved on the transmission rod. The top end of the bellows is connected to the first slider, and the bottom end of the bellows is connected to the sealing flange.

[0015] The lead screw has a first guide rail on one side, which is vertically fixed to the base, and the first slider is slidably sleeved on the first guide rail.

[0016] The internal transmission mechanism includes a bracket, a vertical rack, a gear assembly, and a horizontal rack. The bracket is located on the rear side of the blocking target assembly and fixed to the inner wall of the mounting cavity. The vertical rack is located on the rear side of the blocking target assembly and connected to the bottom end of the transmission rod. The horizontal rack is fixed to the blocking target assembly and perpendicular to the beam injection direction. The gear assembly includes a first gear and a second gear arranged on a common fixed shaft. The diameter of the first gear is smaller than the diameter of the second gear. The first gear meshes with the vertical rack, and the second gear meshes with the horizontal rack. The rear end of the fixed shaft is rotatably connected to the bracket.

[0017] The bracket is fixed with a vertical second guide rail, and the vertical rack is fixed with a second slider that is slidably connected to the second guide rail.

[0018] Furthermore, the top end of the first guide rail is provided with an upper limit stop block fixed on the base, and the bottom end of the first guide rail is provided with a lower limit stop block fixed on the base. The first slider is disposed between the upper limit stop block and the lower limit stop block, and a displacement sensor is fixedly connected to the first slider.

[0019] Furthermore, the blocking target assembly includes a copper base block, a graphite element, and a strip electrode. The horizontal rack is fixed to the top of the copper base block. A third guide rail parallel to the horizontal rack is fixed to the support. The third guide rail is a V-shaped guide rail, and several third guide rails are arranged vertically. A third slider is fixed to the rear wall of the copper base block and slidably connected to the third guide rail. The graphite element is embedded in the front wall of the copper base block. The strip electrode is located in front of the graphite element and covers the front wall of the copper base block. Several multi-core connectors for external electronic systems are installed on the top of the sealing flange. The strip electrode is connected to the multi-core connectors through signal lines. The supports of the two sets of blocking elements have semi-circular notches on adjacent side walls that are adapted to the beam flow diameter.

[0020] Furthermore, the strip electrode includes a high-voltage plate and a metal strip. The high-voltage plate is located on the front side of the graphite component and covers the front wall of the copper base block. The metal strip has a vertical "C"-shaped structure attached to the front wall of the high-voltage plate. The top end of the metal strip is located above the high-voltage plate and connected to the top of the copper base block through a ceramic insulating pad. The bottom end of the metal strip is located below the high-voltage plate and connected to the bottom of the copper base block through a ceramic insulating pad. Several metal strips are arranged side by side.

[0021] Furthermore, a water-cooled box is provided above the copper base block. The water-cooled box is fixed in the mounting cavity, and an inlet pipe and an outlet pipe are respectively connected to the top of the water-cooled box. The inlet pipe and the outlet pipe both pass vertically upward through the sealing flange to connect to the external water supply equipment. A cooling water passage is provided inside the copper base block. The cooling water passage forms an inlet and an outlet on the top of the copper base block, respectively. The inlet and outlet are respectively connected to the water-cooled box through flexible corrugated water pipes.

[0022] The present invention also provides a control system for controlling the above-described beam blocking device for the radiation region of a high-current accelerator. The control system includes a motion control system and an electronics-data acquisition system. The motion control system is configured to control the motion of the drive mechanism, and the electronics-data acquisition system is configured to read and process the bar electrode signals of the blocking target assembly and monitor the position status and beam position information of the blocking target assembly.

[0023] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0024] This invention uses two sets of blocking elements symmetrically distributed on both sides of the beam injection direction in the mounting cavity. A driving mechanism drives the blocking target assembly to reciprocate linearly in the horizontal direction perpendicular to the beam injection direction. This allows the blocking target assemblies of the two independent blocking elements to move independently, thereby opening and closing the entire blocking device. This achieves beam blocking in different ranges of the strong beam in the radiation area, improving work efficiency. At the same time, the arrangement of the shielding iron assembly can effectively ensure the service life of external electrical components in the strong radiation area. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of a beam blocking device provided in an embodiment of the present invention;

[0027] Figure 2 This is a side view of a beam blocking device provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of a beam blocking device provided in an embodiment of the present invention;

[0029] Figure 4This is a schematic diagram of the structure of a blocking element in a beam blocking device provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the assembly structure of the drive mechanism and the blocking target assembly of a beam blocking device provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the assembly structure of the internal transmission mechanism and the blocking target assembly of a beam blocking device provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of a beam blocking device blocking target assembly provided in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the distribution structure of metal strips in a beam blocking device provided in an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the assembly structure of a metal strip and a high-voltage plate of a beam blocking device provided in an embodiment of the present invention.

[0035] The markings in the attached diagram are as follows:

[0036] 1. Mounting cavity; 11. First flange interface; 12. Second flange interface; 2. Blocking element; 21. Shielding iron assembly; 22. Blocking target head assembly; 221. Copper base block; 222. Graphite component; 223. Strip electrode; 2231. High voltage plate; 2232. Metal strip; 224. Third slider; 225. Ceramic insulating gasket; 23. Sealing flange; 231. Multi-core connector; 24. Lifting device; 25. External drive mechanism; 2 51. Base; 252. Transmission assembly; 253. Motor; 254. Corrugated pipe; 255. Transmission rod; 256. Displacement sensor; 26. Internal transmission mechanism; 261. Bracket; 262. Vertical rack; 263. Horizontal rack; 264. Second gear; 265. Second guide rail; 266. Second slider; 267. Third guide rail; 3. Water cooling box; 31. Inlet pipe; 32. Outlet pipe; 33. Flexible corrugated water pipe. Detailed Implementation

[0037] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0038] Traditional accelerators are prone to damage to electronic components and have low operating efficiency in highly radioactive environments. This invention provides a beam blocking device and control system for the radiation region of a high-current accelerator. The beam blocking device includes a mounting cavity and two sets of blocking elements symmetrically distributed on both sides of the beam injection direction within the mounting cavity. Each blocking element includes a shielding iron assembly, a blocking target assembly, and a driving mechanism. The driving mechanism drives the blocking target assembly to reciprocate linearly in a horizontal direction perpendicular to the beam injection direction. By utilizing the independently moving blocking target assemblies of the two blocking elements, the entire blocking device can be opened and closed, achieving beam blocking in different ranges of the high-current beam in the radiation region, thereby improving operating efficiency. Furthermore, the shielding iron assembly blocks radioactive ions, extending the equipment's service life.

[0039] The present invention will be described in detail below through embodiments.

[0040] Example

[0041] like Figure 1 and Figure 2 As shown, the present invention provides a beam blocking device for the radiation region of a high-current accelerator, comprising a mounting cavity 1 and a blocking element 2, specifically configured as follows:

[0042] The mounting cavity 1 has flange interfaces on its cavity wall that connect to the accelerator beam pipe. Specifically, a first flange interface 11 for beam injection is provided on the front cavity wall of the mounting cavity 1, and a second flange interface 12 for beam ejection is provided on the rear cavity wall of the mounting cavity 1. The first flange interface 11 and the second flange interface 12 are arranged opposite to each other, and the first flange interface 11 and the second flange interface 12 form a beam flow path within the mounting cavity 1. An extraction pipe is connected to the outer cavity wall of the mounting cavity 1, with one end of the extraction pipe connected to the inside of the mounting cavity 1 and the other end located away from the mounting cavity 1.

[0043] Combination Figure 3 , Figure 4 and Figure 5As shown, the blocking element 2 includes a shielding iron assembly 21, a blocking target assembly 22, and a driving mechanism. The shielding iron assembly 21 is fixed inside the mounting cavity 1. The shielding iron assembly 21 is used to block radioactive ions, effectively protecting external electronic and electrical components and extending the service life of the equipment. Guide balls are provided on both sides of the shielding iron assembly 21, which cooperate with guide grooves inside the vacuum chamber to achieve automatic hoisting of the blocking element 2. The specific structure of the shielding iron assembly 21 has been disclosed in invention patent 202011155076.3 and will not be repeated here. The blocking target assembly 22 is located inside the mounting cavity 1, below the shielding iron assembly 21. The driving mechanism is mounted on the mounting cavity 1 and connected to the blocking target assembly 22, and is used to drive the blocking target assembly 22 to reciprocate linearly in the horizontal direction perpendicular to the beam injection direction.

[0044] Based on the above structural arrangement, two sets of blocking elements 2 are provided in the mounting cavity 1, and the two sets of blocking elements 2 are symmetrically distributed on both sides of the beam injection direction. With this structure, the blocking target assembly 22 of the two independent blocking elements 2 can move independently to realize the opening and closing of the entire blocking device, thereby achieving beam blocking in different ranges of the strong beam in the radiation area.

[0045] Furthermore, an assembly port for inserting the blocking element 2 is provided at the top of the mounting cavity 1. The blocking element 2 also includes a sealing flange 23. The sealing flange 23 is located above the mounting cavity 1, covering the assembly port and connected to the top of the shielding iron assembly 21. After the blocking element 2 is hoisted into the mounting cavity 1, the sealing flange 23 seals the assembly port by the weight of the shielding iron assembly 21. Preferably, a lifting device 24 is fixed to the top of the sealing flange 23. The lifting device 24 is used to realize the hoisting and transportation of the blocking element 2 by the overhead crane. The beam blocking device of the present invention, by integrating the shielding iron assembly 21 and the lifting device 24, can effectively protect external electrical components in the strong radiation area, increasing their service life. The lifting device 24 allows for remote automatic hoisting of the blocking element 2 by the overhead crane, greatly improving work efficiency and the operating efficiency of the accelerator.

[0046] A preferred embodiment is that the drive mechanism includes an external drive mechanism 25 and an internal transmission mechanism 26;

[0047] An external drive mechanism 25 is mounted on a sealing flange 23 above the mounting cavity 1 and includes a base 251, a transmission assembly 252, a motor 253, a bellows 254, and a transmission rod 255. The base 251 is fixed to the top of the sealing flange 23. The transmission assembly 252 includes a lead screw and a first slider that matches the lead screw. The lead screw is vertically rotatably connected to the base 251, and the motor 253 is fixed to the top of the base 251, with its output end connected to the lead screw. The transmission rod 255 is located inside the mounting cavity 1, its top end passing through the sealing flange 23 and connecting to the first slider, and its bottom end passing through the shielding iron assembly 21 and connecting to the internal transmission mechanism 26. The transmission assembly is formed using a lead screw and slider structure. The motor 253 drives the lead screw to rotate, thereby causing the slider to move up and down, which in turn causes the transmission rod 255 to perform reciprocating linear motion in the vertical direction. A bellows 254 is positioned above the sealing flange 23 and fitted onto the transmission rod 255. The top end of the bellows 254 is connected to the first slider, and the bottom end is connected to the sealing flange 23. The bellows 254 buffers the downward vertical movement of the first slider and assists its upward movement. A first guide rail is provided on one side of the lead screw, vertically fixed to the base 251, and the first slider slides on the first guide rail. This structure ensures stable vertical linear movement of the first slider along the first guide rail.

[0048] Furthermore, an upper limit stop block fixed to the base 251 is provided at the top of the first guide rail, and a lower limit stop block fixed to the base 251 is provided at the bottom of the first guide rail. A first slider is positioned between the upper and lower limit stops, and a displacement sensor 256 is fixedly connected to the first slider. This structure limits the movement of the first slider along the first guide rail using the upper and lower limit stops, and the displacement sensor 256 detects the displacement of the transmission rod 255 to monitor the position of the blocking target assembly 22.

[0049] As mentioned above, such as Figure 6 and Figure 7As shown, the internal transmission mechanism 26 includes a bracket 261, a vertical rack 262, a gear assembly, and a horizontal rack 263. The bracket 261 is located on the rear side of the blocking target assembly 22 and fixed to the inner wall of the mounting cavity 1. The vertical rack 262 is located on the rear side of the blocking target assembly 22 and connected to the bottom end of the transmission rod 255. The horizontal rack 263 is fixed to the blocking target assembly 22 and perpendicular to the beam injection direction. The gear assembly includes a first gear and a second gear 264 arranged on a common fixed shaft. The diameter of the first gear is smaller than the diameter of the second gear 264, and the first gear meshes with the vertical rack 262, while the second gear 264 meshes with the horizontal rack 263. The rear end of the fixed shaft is rotatably connected to the bracket 261. With this structure, the vertical rack 262 is driven to reciprocate linearly in the vertical direction based on the up-and-down movement of the transmission rod 255. The vertical rack 262 drives the first gear to rotate, which in turn drives the second gear 264 to rotate via a fixed shaft. The rotation of the second gear 264 causes the horizontal rack 263 to move left and right, thereby enabling the blocking target assembly 22 to reciprocate linearly in the horizontal direction perpendicular to the beam injection direction. This achieves the opening and closing function of the blocking target assembly 22 of the two sets of blocking elements 2 at the flange interface. Simultaneously, by utilizing the fact that the diameter of the first gear is smaller than that of the second gear 264, the transmission between the large and small gears effectively reduces the movement range of the external drive mechanism 25, reduces the overall height of the equipment, and meets the lifting range of the overhead crane.

[0050] Preferably, a vertical second guide rail 265 is fixed on the bracket 261, and a second slider 266 is fixed to the vertical rack 262 and slidably connected to the second guide rail 265. The second guide rail 265 provides guidance for the movement of the vertical rack 262.

[0051] Furthermore, the blocking target assembly 22 includes a copper base block 221, a graphite element 222, and a strip electrode 223. A horizontal rack 263 is fixed to the top of the copper base block 221, and a third guide rail 267 parallel to the horizontal rack 263 is fixed to the support 261. The third guide rail 267 is a V-shaped guide rail, and several third guide rails 267 are arranged vertically. A third slider 224 is fixed to the rear wall of the copper base block 221 and slidably connected to the third guide rail 267, and the configuration of the third guide rail 267 provides guidance for the movement of the blocking target assembly 22.

[0052] Among them, the third guide rail 267 and the second guide rail 265 both adopt V-shaped all-metal guide rails, which can be used in high vacuum environments and strong radiation environments.

[0053] A graphite element 222 is embedded in the front wall of a copper base block 221, and the front wall of the graphite element 222 is flush with the front wall of the copper base block 221. A strip electrode 223 is located on the front side of the graphite element 222, covering the front wall of the copper base block 221. Several multi-core connectors 231 for connecting to an external electronics system are installed on the top of the sealing flange 23, and the strip electrode 223 is connected to the multi-core connectors 231 via signal lines 234. Preferably, two sets of multi-core connectors 231 are provided for leading out the signal from the strip electrode 223. With this structure, the strip electrode 223 generates secondary electrons when the beam passes through, allowing the collected current signal to be transmitted to the electronics system via the signal lines and multi-core connectors 231. After processing by the electronics system, the signal is acquired and processed by the data acquisition system, and the beam position information is displayed in real time, thereby measuring the beam position and improving work efficiency.

[0054] The support 261 is hollow to minimize weight. Furthermore, the supports 261 of the two sets of blocking elements 2 have semi-circular notches on adjacent sidewalls that match the beam flow path, ensuring an effective beam flow path under normal conditions.

[0055] Furthermore, combined Figure 8 and Figure 9 As shown, the strip electrode 223 includes a high-voltage plate 2231 and metal strips 2232. The high-voltage plate 2231 is a high-voltage metal plate, located in front of the graphite component 222 and covering the front wall of the copper substrate 221. The metal strips 2232 are vertically attached to the front wall of the high-voltage plate 2231 in a "C" shape, with the top of the metal strips 2232 above the high-voltage plate 2231 and connected to the top of the copper substrate 221 via a ceramic insulating pad 225, and the bottom of the metal strips 2232 below the high-voltage plate 2231 and connected to the bottom of the copper substrate 221 via a ceramic insulating pad 225. Several metal strips 2232 are arranged side-by-side, and are several thin metal strips with equal spacing.

[0056] A preferred implementation is: review Figure 6 A water-cooled box 3 is mounted above the copper base block 221. The water-cooled box 3 is fixed inside the mounting cavity 1, and an inlet pipe 31 and an outlet pipe 32 are connected to the top of the water-cooled box 3. Both the inlet pipe 31 and the outlet pipe 32 pass vertically upward through the sealing flange 23 and are connected to the external water supply equipment. A cooling water passage is provided inside the copper base block 221, with an inlet and an outlet formed at the top of the copper base block 221, and the inlet and outlet are connected to the water-cooled box 3 through flexible corrugated water pipes 33. The water-cooling structure facilitates the cooling and temperature reduction of the copper base block 221.

[0057] The present invention also provides a control system for controlling the aforementioned beam blocking device, comprising a motion control system and an electronics-data acquisition system. The motion control system is configured to control the movement of the drive mechanism, and the electronics-data acquisition system is configured to read and process the signals from the strip electrodes 223 of the blocking target assembly 22, and monitor the position status and beam position information of the blocking target assembly 22.

[0058] The present invention provides a beam blocking device and control system for the radiation region of a high-current accelerator, which has the following advantages:

[0059] 1. The beam blocking device of the present invention utilizes the blocking target assembly 22 of two independent blocking elements 2, which can move independently to realize the opening and closing of the entire blocking device, thereby achieving beam blocking in different ranges of the strong beam in the radiation region and improving working efficiency.

[0060] 2. The beam blocking device of the present invention comes with a shielding iron assembly 21 and a lifting device 24. At the same time, the external drive mechanism 25 is a radiation-resistant all-metal drive mechanism. In the strong radiation area, the shielding iron assembly 21 can effectively protect the external electrical components and increase their service life. The lifting device 24 can meet the requirements of remote automatic lifting of components by the overhead crane, greatly improving work efficiency and the operating efficiency of the accelerator.

[0061] 3. The beam blocking device of the present invention adopts a combination of two sets of gear and rack drive, which converts the vertical up-and-down movement of the external drive mechanism 25 into the horizontal movement of the internal transmission mechanism 26, and the transmission structure is simple and reliable.

[0062] 4. The beam blocking device of the present invention adopts a structure in which the blocking target assembly 22 is inlaid with graphite on a copper base block 221, which significantly increases the beam range and effectively reduces the thermal power per unit volume. At the same time, this combined structure can effectively reduce radiation activation.

[0063] 5. The beam blocking device of the present invention utilizes the setting of the strip electrode 223 in the blocking target assembly 22 to detect the position distribution of the beam and provide the position distribution of the beam while blocking the beam.

[0064] In summary, the beam blocking device of the present invention can meet the requirements of automatic hoisting, realize beam blocking in different ranges of strong beams in the radiation zone, and simultaneously measure the beam position; the transmission structure has high motion accuracy and can monitor the position status in real time. It has the characteristics of simple structure, convenient use, high reliability, high working efficiency and low cost, and can provide reliable services for accelerator beam experiments and machine protection.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A beam blocking device for the radiation region of a high-current accelerator, characterized in that, The beam blocking device includes: The mounting cavity has a flange interface on its wall that connects to the accelerator beam pipe; The blocking element includes a shielding iron assembly, a blocking target assembly, and a driving mechanism. The shielding iron assembly is fixed in the mounting cavity, and the blocking target assembly is located in the mounting cavity below the shielding iron assembly. The driving mechanism is mounted on the mounting cavity and connected to the blocking target assembly, and is used to drive the blocking target assembly to reciprocate linearly in the horizontal direction in a direction perpendicular to the beam injection direction. Two sets of blocking elements are provided in the mounting cavity, and the two sets of blocking elements are symmetrically distributed on both sides of the beam injection direction; The top of the mounting cavity is provided with an assembly port for inserting the blocking element. The blocking element also includes a sealing flange, which is located above the mounting cavity, covers the assembly port, and is connected to the top of the shielding iron assembly. It is used to seal the assembly port by the weight of the shielding iron assembly. The drive mechanism includes an external drive mechanism and an internal transmission mechanism; The external drive mechanism is located above the mounting cavity and mounted on the sealing flange. It includes a base, a transmission assembly, a motor, a bellows, and a transmission rod. The base is fixed to the top of the sealing flange. The transmission assembly includes a lead screw and a first slider that matches the lead screw. The lead screw is vertically rotatably connected to the base. The motor is fixed to the top of the base, and the output end of the motor is connected to the lead screw. The transmission rod is located inside the mounting cavity. Its top end passes through the sealing flange and is connected to the first slider. Its bottom end passes through the shielding iron assembly and is connected to the internal transmission mechanism. The bellows is located above the sealing flange and is sleeved on the transmission rod. The top end of the bellows is connected to the first slider, and the bottom end of the bellows is connected to the sealing flange. The lead screw has a first guide rail on one side, which is vertically fixed to the base, and the first slider is slidably sleeved on the first guide rail. The internal transmission mechanism includes a bracket, a vertical rack, a gear assembly, and a horizontal rack. The bracket is located on the rear side of the blocking target assembly and fixed to the inner wall of the mounting cavity. The vertical rack is located on the rear side of the blocking target assembly and connected to the bottom end of the transmission rod. The horizontal rack is fixed to the blocking target assembly and perpendicular to the beam injection direction. The gear assembly includes a first gear and a second gear arranged on a common fixed shaft. The diameter of the first gear is smaller than the diameter of the second gear. The first gear meshes with the vertical rack, and the second gear meshes with the horizontal rack. The rear end of the fixed shaft is rotatably connected to the bracket. The bracket is fixed with a vertical second guide rail, and the vertical rack is fixed with a second slider that is slidably connected to the second guide rail. The blocking target assembly includes a copper base block, a graphite component, and a strip electrode. The horizontal rack is fixed to the top of the copper base block. A third guide rail parallel to the horizontal rack is fixed to the support. The third guide rail is a V-shaped guide rail, and several third guide rails are arranged vertically. A third slider is fixed to the rear wall of the copper base block and slidably connected to the third guide rail. The graphite component is embedded in the front wall of the copper base block. The strip electrode is located in front of the graphite component and covers the front wall of the copper base block. Several multi-core connectors for external electronic systems are installed on the top of the sealing flange. The strip electrode is connected to the multi-core connectors through signal lines. The supports of the two sets of blocking elements have semi-circular notches on adjacent side walls that are adapted to the beam flow diameter. The multi-core connector is provided in two sets for leading out the signal from the strip electrode. The strip electrode generates secondary electrons when the beam passes through, and the collected current signal is transmitted to the electronics system through the signal line and the multi-core connector. After being processed by the electronics system, it is acquired and processed by the data acquisition system and the beam position information is displayed in real time. Then, the beam position is measured to improve work efficiency.

2. A beam blocking device for the radiation region of a high-current accelerator according to claim 1, characterized in that: The front wall of the mounting cavity is provided with a first flange interface for beam injection, and the rear wall of the mounting cavity is provided with a second flange interface for beam ejection. The first flange interface and the second flange interface are arranged opposite to each other, and the first flange interface and the second flange interface form a beam flow path within the mounting cavity.

3. The beam blocking device for the radiation region of a high-current accelerator as described in claim 1, characterized in that: A lifting device is fixed to the top of the sealing flange.

4. A beam blocking device for the radiation region of a high-current accelerator according to claim 1, characterized in that: The top end of the first guide rail is provided with an upper limit stop block fixed on the base, and the bottom end of the first guide rail is provided with a lower limit stop block fixed on the base. The first slider is disposed between the upper limit stop block and the lower limit stop block, and a displacement sensor is fixedly connected to the first slider.

5. The beam blocking device for the radiation region of a high-current accelerator as described in claim 1, characterized in that: The strip electrode includes a high-voltage plate and a metal strip. The high-voltage plate is located on the front side of the graphite component and covers the front wall of the copper base block. The metal strip has a vertical "C"-shaped structure attached to the front wall of the high-voltage plate. The top end of the metal strip is located above the high-voltage plate and is connected to the top of the copper base block through a ceramic insulating pad. The bottom end of the metal strip is located below the high-voltage plate and is connected to the bottom of the copper base block through a ceramic insulating pad. Several metal strips are arranged side by side.

6. The beam blocking device for the radiation region of a high-current accelerator as described in claim 1, characterized in that: A water-cooled box is provided above the copper base block. The water-cooled box is fixed in the mounting cavity, and an inlet pipe and an outlet pipe are respectively connected to the top of the water-cooled box. The inlet pipe and the outlet pipe both pass vertically upward through the sealing flange and are connected to the external water supply equipment. A cooling water passage is provided inside the copper base block. The cooling water passage forms an inlet and an outlet on the top of the copper base block, respectively. The inlet and outlet are respectively connected to the water-cooled box through flexible corrugated water pipes.

7. A control system for controlling a beam blocking device for the radiation region of a high-current accelerator as described in any one of claims 1-6, characterized in that: The control system includes a motion control system and an electronics-data acquisition system. The motion control system is configured to control the motion of the drive mechanism, and the electronics-data acquisition system is configured to read and process the bar electrode signals of the blocking target assembly and monitor the position status and beam position information of the blocking target assembly.

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