An RFQ water supply system that is easy to monitor and maintain in real time

Abstract

The present invention relates to the field of accelerator technology, and in particular to an RFQ water supply system that is convenient for real-time monitoring and maintenance; the water supply system comprises a mounting bracket, a water circulation system and a real-time monitoring system, the mounting bracket is mounted above the RFQ accelerator cavity, and the water circulation system and the real-time monitoring system are mounted on the mounting bracket; the water supply system is structurally separated from the cavity, the water supply system is completely located above the cavity, and there is a large gap between the water supply system and the cavity except for the hose connection, so that the structure is more compact, the influence of the vibration of the water system on the cavity is greatly reduced, and it is convenient for workers to operate and maintain; the water system not only solves the cooling of the RFQ accelerator cavity and auxiliary equipment, but also plays a role in cavity field tuning; the acquisition terminal of all water flow switch signals adopts a point-surface-line method to completely solve data acquisition and signal return, and the advantage of this data acquisition method is that a control cabinet is omitted, so that the control method is light and easy to implement.

Description

Technical Field

[0001] The invention relates to the technical field of accelerators, in particular to an RFQ water supply system which is convenient for real-time monitoring and maintenance. Background Art

[0002] Radio Frequency Quadrupole (RFQ) accelerator is a high-current low-energy ion linear accelerator. Because it can directly accelerate low-energy ions drawn from the ion source, and integrate multiple functions such as acceleration, longitudinal clustering, transverse focusing and matching into one structure, it can efficiently accelerate tens of milliamperes, hundreds of milliamperes or even ampere-level high-current ion beams to about 7MeV / μ. As a universal pre-accelerator for low-energy and high-current accelerators, RF quadrupole accelerators have been increasingly widely used in large scientific facilities such as spallation neutron sources, accelerator-driven clean nuclear energy systems, neutrino factories, and small accelerator neutron sources. Traditional RF quadrupole accelerator structures include four-wing and four-rod types. Among them, the four-wing RF quadrupole field is suitable for working at higher frequencies, high duty cycles and high average RF power conditions. At present, the four-wing RF quadrupole field has become a commonly selected acceleration structure for the initial stage of high-current accelerators (from ion sources to energies of several MeV).

[0003] When ions run in the RF quadrupole field, the high-frequency electromagnetic field produces a strong thermal effect in the linear accelerator cavity, resulting in a large heat flux density of the accelerated particles and a constant fluctuation in the heat load, which in turn causes the temperature of the accelerator cavity to rise and its inherent frequency to change. In particular, the temperature and frequency changes of the end unit, electrode and coupling unit are the most obvious. Therefore, during the construction of the RF quadrupole accelerator project, a corresponding water supply circulation system is usually configured for the project to cool the accelerator cavity. In theory, the four electrodes of each acceleration section have the largest heat load and are made of heat-sensitive elements. The thermal effect is the most obvious and the temperature rises the fastest. They are the parts with the highest temperature in the entire accelerator cavity and should be the most urgently in need of cooling. Therefore, in actual construction, some projects will treat the water supply circulation system differently because they believe that the cooling requirements and effects of different components in the accelerator cavity are different. This kind of project in which there are multiple different water supply circulation systems in the same cavity to achieve the cooling effect is not only difficult to build and has high maintenance costs, but more importantly, it is difficult to achieve real-time monitoring in a practical sense.

[0004] For example, Chinese patent application No. 2019104191053 discloses a water distribution system for a four-wing radio frequency quadrupole accelerator cavity, the water distribution system comprising a left water distribution pipeline and a right water distribution pipeline arranged on both sides of the accelerator cavity, the left water distribution pipeline and the right water distribution pipeline both comprising a universal water distribution pipeline and an electrode water distribution pipeline, the electrode water distribution pipeline comprising an electrode water inlet main pipe, a plurality of electrode water inlet branches, a plurality of electrode water return branches and an electrode water return main pipe, although this technical solution sets up an electrode water distribution pipeline specifically for cooling the electrode, and cools down the four electrodes at both ends of each accelerating section of the accelerator cavity, so that the cooling between different components in the accelerator cavity is maintained at the same temperature, thereby stabilizing the temperature and frequency in the accelerator cavity, so that the accelerator cavity obtains a high-current ion beam with a stable frequency, but Due to the four-section cavity partition design, the left and right water distribution pipelines are arranged in the same way, resulting in uneven water distribution in different return branches. Such a design makes the process relatively complex, the construction cost is high, and the maintenance is inconvenient; in addition, the electrode return branch and the general return branch both collect multiple primary return branches through the water divider to a smaller number of secondary return branches, and a smaller number of temperature sensors and flow meters are set on the secondary return branches. Such a design, if not combined with a powerful control system and screen display system, is difficult to monitor the temperature and flow of the branch water channels in real time in a practical sense, and there is a high probability of false alarm signals; more importantly, the technical solution mixes the water supply system with the RFQ mounting bracket, making it difficult to implement manual maintenance work. Summary of the invention

[0005] The present invention aims to solve the problem in the prior art that it is difficult to realize real-time monitoring and convenient maintenance of a four-wing radio frequency quadrupole accelerator cavity, and aims to provide a compact RFQ water supply circulation system that is convenient for real-time monitoring and maintenance.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: an RFQ water supply system that is easy to monitor and maintain in real time, characterized in that: the water supply system includes a mounting bracket, a water circulation system and a real-time monitoring system, the mounting bracket is a cantilever beam lattice structure in the shape of a "7" as a whole, which is installed above the RFQ accelerator cavity, and the water circulation system and the real-time monitoring system are installed on the mounting bracket.

[0007] Ladders are arranged on the vertical beams on both sides of the mounting bracket, a water circulation pipe is hung on the horizontal beam, and the RFQ accelerator cavity is installed directly below the water circulation pipe.

[0008] The water circulation system includes N groups of water circulation pipe groups, N inlets and N outlets, forming N groups of independent water supply circulation systems. Each group of water circulation pipe groups includes an inlet / return main pipe and an inlet / return branch pipe. The inlet / return main pipe of each water circulation pipe group is branched to form an even number of water circulation units just above the accelerator cavity. The circulating water inlet and return pipes of each water circulation unit are arranged in space in a mirror-image distribution with the center line of the cavity.

[0009] The real-time monitoring system includes a data acquisition box, a water flow switch and a control center. The number of the data acquisition boxes is the same as the water circulation units, which respectively monitor and collect the electrical signals of the water flow of different water circulation units in real time; a water flow switch is installed on each circulating water pipeline to monitor the water flow in the pipeline in real time, and serves as a collection terminal point for the water flow switch signal of the pipeline. After the data acquisition panel collects the water flow signals of each pipeline in the water circulation unit, the water flow sensor data of each pipeline is transmitted to the control center through their respective cable lines.

[0010] Each water circulation unit is divided into inlet and return pipes to form multiple circulating water channels, part of which is used to cool the cavity, and part of which is used to cool other auxiliary equipment. In space, the inlet pipe and return pipe of any circulating water channel correspond one to one in order from front to back.

[0011] The horizontal beams and vertical beams are both made of channel steel and serve as data line routing ducts.

[0012] The data acquisition box is placed in the shielding box via the data acquisition panel, and the data acquisition box is installed on the crossbeam of the corresponding mounting bracket above the water circulation unit cavity.

[0013] There is an obvious distance between the water circulation system and the accelerator cavity, and the connection is achieved through a hose.

[0014] Each water flow switch has its own data line connected to each input pin of the corresponding data acquisition panel. Each water flow switch corresponds to the pin name of the data acquisition panel one by one to form a data acquisition center. Each data acquisition panel transmits the signal back to the control center through a multi-core data line.

[0015] Each of the data acquisition panels transmits signals back to the control center via a multi-core data line, including one switch quantity summary signal and one RS-485 communication signal.

[0016] The control center performs interlocking operations according to the summary signal, and reads the state of each water flow switch or sets shielding through RS-485 signals.

[0017] Each water circulation pipeline group includes an inlet / return main pipeline connected to an inlet / return branch pipeline through a flange to form an inlet / return circulation water circuit.

[0018] The water circulation system of the two groups of water circulation pipeline groups can achieve tuning of the microwave field intensity in the cavity by changing the water temperature difference between the two systems.

[0019] The beneficial effects of the present invention are as follows: the present invention mainly provides a large-scale RFQ water supply system. In terms of the overall structure, the water supply system is clearly separated from the cavity. The water supply system is completely located above the cavity. Except for the hose connection, there is a large gap between the water supply system and the cavity, which abandons the foreign method of mixing the water circulation system with the RFQ bracket into one, making the structure brighter; the water supply system is above the cavity and at a moderate distance, and is connected with a hose, which greatly reduces the impact of the vibration of the water system on the cavity; in addition, the main function of the mounting bracket in the present invention is hoisting, and the left and right sides are ladder-type designs and cantilever beam lattice structures, which can not only stabilize the water circulation pipeline, but also facilitate the operation and maintenance of the carrying workers.

[0020] The water circulation system includes two completely independent water supply systems that can be monitored in real time. The two water systems not only solve the cooling of the RFQ accelerator cavity and auxiliary equipment, but also play a role in cavity field tuning.

[0021] In the real-time monitoring of water flow, all water flow switch signal acquisition terminals adopt a point-surface-line method to complete data acquisition and signal feedback. The advantage of this data acquisition method is that it eliminates the need for a control cabinet, making the control method light and easy to implement. When a certain signal line is abnormal, the water flow switch position can be quickly located, saving time and energy for troubleshooting; and the signal of any water flow switch can be shielded as needed to check other pipelines; the data acquisition panel is reliably connected and located on the mounting bracket. It is usually unmanned and safer and more reliable. Since the cables are integrated in the channel steel, the overall appearance is neat, simple and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall installation layout structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the installation structure of the water circulation system and the installation bracket in the present invention.

[0024] Figure 3 It is a schematic diagram of the layout of the water circulation system in the present invention.

[0025] Notes on the attached drawings: 1-installation bracket, 11-ladder, 12-water circulation pipe, 13-crossbeam, 2-water circulation system, 21-inlet / return main pipe, 22-inlet / return branch pipe, 23-water circulation unit, 3-real-time monitoring system, 31-data collection box, 32-water flow switch, 4-accelerator cavity. DETAILED DESCRIPTION

[0026] The following describes in detail the specific implementation of the present invention in conjunction with the accompanying drawings of the specification, taking an example in which there are two groups of water circulation pipe groups in a water circulation system as a specific embodiment:

[0027] A RFQ water supply system that is convenient for real-time monitoring and maintenance, the water supply system comprising a mounting bracket 1, a water circulation system 2 and a real-time monitoring system 3, the mounting bracket 1 being a cantilever beam lattice structure in a "7" shape as a whole, mounted above an RFQ accelerator cavity 4, the water circulation system 2 and the real-time monitoring system 3 being mounted on the mounting bracket 1; there is an obvious distance between the water circulation system 2 and the RFQ accelerator cavity 4, and the connection is achieved through a hose.

[0028] The vertical beams on both sides of the mounting bracket 1 are provided with ladders 11, and a water circulation pipe 12 is suspended on the horizontal beam 13. The horizontal beam 13 and the vertical beams are both made of channel steel and serve as data line routing troughs; an RFQ accelerator cavity 4 is installed directly below the water circulation pipe 12, and the RFQ accelerator cavity 4 is divided into four mechanical cavities.

[0029] The water circulation system 2 includes two groups of water circulation pipes 12, two inlets and two outlets, which are two independent water supply circulation systems 2. The water circulation system 2 of the two groups of water circulation pipes 12 can achieve the tuning of the microwave field intensity in the cavity by changing the water temperature difference between the two systems; each group of water circulation pipes 12 includes an inlet / return main pipe 21 and an inlet / return branch pipe 22, which can provide multi-path circulating water. The water circulation system 2 is spatially arranged and located directly above the accelerator cavity 4. The inlet / return main pipe 21 of each group of water circulation pipes 12 is branched to form four inlet / return main pipes 21 directly above the accelerator cavity 4. The water circulation unit 23 provides water cooling for the four mechanical cavities. The circulating water inlet and return pipes of each water circulation unit 23 are arranged in a mirror image distribution along the center line of the cavity. Each water circulation unit 23 has inlet and return pipes to form multiple circulating water channels. Part of the multiple circulating water channels is used to cool the cavity, and part is used to cool other auxiliary equipment. The inlet pipe and return pipe of any circulating water channel in space correspond one to one in a front-to-back order. Each group of water circulation pipes 12 includes an inlet / return main pipe 21 connected to an inlet / return branch pipe 22 via a flange to form an inlet / return circulating water circuit.

[0030] The real-time monitoring system 3 includes a data acquisition box 31, a water flow switch 32 and a control center. There are four data acquisition boxes 31, which respectively monitor and collect the electrical signals of the water flow of the four water circulation units 23 in real time. The data acquisition box 31 is placed in a shielding box by a data acquisition panel. The data acquisition box 31 is installed on the crossbeam 13 of the corresponding mounting bracket 1 above the cavity of the water circulation unit 23; each circulating water pipeline is installed with a water flow switch 32 for real-time monitoring of the water flow in the pipeline, as the collection terminal point of the water flow switch signal of the pipeline, after the data acquisition panel collects the water flow signals of each pipeline in the water circulation unit 23, through their respective electrical The cable line transmits the water flow sensor data of each channel to the control center; the data line of each water flow switch 32 is connected to the input pins of the corresponding data acquisition panel, and each water flow switch 32 corresponds to the pin name of the data acquisition panel one by one to form a data acquisition center, and each data acquisition panel transmits the signal back to the control center through a multi-core data line; each data acquisition panel transmits the signal back to the control center through a multi-core data line, including a switch quantity summary signal and an RS-485 communication signal; the control center performs interlocking operations according to the summary signal, and reads the status of each water flow switch 32 or sets shielding through the RS-485 signal.

[0031] Example: There are 137 water cooling circulation pipelines in total

[0032] The RFQ water supply system in this embodiment, which is easy to monitor and maintain in real time, is a large water system for the high-power RFQ accelerator cavity 4. It is a water-cooled water distribution system with numerous water channels and a complex structure. It includes two completely independent water circulation systems 2 that can be monitored in real time. The two water systems provide a total of 137 circulating water channels, which can solve the cooling of the cavity and its ancillary equipment, and the cavity field tuning function.

[0033] In this embodiment, the water supply system mainly includes an installation bracket 1, a water circulation system 2 and a real-time monitoring system 3, wherein the main function of the installation bracket 1 is to hoist and stabilize the water circulation pipe 12. Since the water pipes on the cavity are arranged in a high and irregular density and need to be easily installed and maintained, the left and right sides of the installation bracket 1 adopt a ladder 11-type design combined with a cantilever beam truss structure, which not only hoists the water circulation pipe 12 but also carries workers for operation and maintenance; in addition, the left and right sides are ladder 11-type designs, and the cantilever beam truss structure is the main force-bearing structure, on which a cross beam 13 is built, and the cross beam 13 serves as a hoisting force base for the water circulation pipe 12, and the vertical beam is a structural connector. The channel steel as a beam can be used as a data line routing trough, and the vertical support and the inclined support are used as auxiliary force supports.

[0034] In this embodiment, the water circulation system 2 is separated from the RFQ accelerator cavity 4. The water circulation system 2 is completely located above the cavity. There is a large gap between the water circulation system 2 and the cavity except for the hose connection. The foreign method of mixing the water circulation system 2 with the RFQ bracket is abandoned, making the structure more lively. The water circulation system 2 is above the cavity and at a moderate distance. It is connected with a hose, which greatly reduces the impact of the water system vibration on the cavity compared with the previous similar products connected with copper pipes. The water circulation pipeline 12 is divided into two groups, two inlets and two outlets, as two independent water circulation systems 2, which are arranged just above the cavity in terms of spatial design. Four water circulation units 23 are formed directly above the cavity to provide water cooling for the four mechanical cavities; each unit is divided into inlet and return, with a total of 32 circulating water routes, of which 20 routes cool the cavity, and the inlet pipe and return pipe of any circulating water route in space are mirror-distributed along the center line of the cavity, which is convenient for workers to identify and operate during maintenance; the remaining 12 routes cool other auxiliary equipment, and the inlet and return pipes of any circulating water route in space correspond one to one in a front-to-back order. This method greatly reduces the difficulty and error rate of operation, reduces labor costs and time costs, and realizes a more efficient water circulation system 2 with high density, high integration, and high efficiency in a limited space.

[0035] In this embodiment, the real-time monitoring system 3 is regarded as a data control system of a large RFQ water supply system, including a data acquisition panel, a water flow switch 32 and a control center. There are four data acquisition panels, which respectively monitor and collect the electrical signals of the water flow of four water circulation units 23 in real time; each circulating water pipeline is equipped with a water flow switch 32 for real-time monitoring of the water flow in the pipeline, which serves as a collection terminal point for the water flow switch signal of the pipeline. After the data acquisition panel collects the water flow signals of each pipeline in the water circulation unit 23, it transmits the water flow sensor data of each pipeline to the control center through its own cable line; 137 of them The acquisition terminal of the water flow switch signal of the water-cooling circulation pipeline adopts a point-surface-line method to complete data acquisition and signal feedback, that is, each water-cooling circulation pipeline is installed with a water flow switch 32, and the sensor of the water flow switch 32 sends a signal to the responsible data acquisition panel, that is, there are a total of 137 water flow switches 32; since the RFQ accelerator cavity 4 is composed of four mechanical cavities, the 137 circulating water pipelines are respectively arranged into four water circulation units 23, and each water circulation unit 23 is designed to have 39, 32, 32, and 34 circulation pipelines, respectively, and four data acquisition panels correspond to the four water circulation units 23 one by one. The data acquisition panel is placed in a shielding box, which is installed on the crossbeam 13 of the mounting bracket 1 directly above the mechanical cavity. Each water flow switch 32 has its own data line connected to each input pin of the data acquisition panel to form a data acquisition center. Each water flow switch 32 corresponds to the pin name of the data acquisition panel one by one. Each data acquisition panel transmits the signal back to the control center through a multi-core data line, including a switch quantity summary signal and an RS-485 communication signal. The control center makes a chain operation according to the summary signal, and can read the state of each water flow switch 32 or set the shielding through the RS-485 signal. The advantage of this data acquisition method is that the control cabinet is omitted, making the control method light and easy to implement. When a certain signal output line is abnormal, the position of the water flow switch 32 can be quickly located, saving time and energy for troubleshooting; and the signal of any water flow switch 32 can be shielded as needed to check other pipelines; the data acquisition panel is reliably connected and is located on the mounting bracket 1. It is usually unmanned and safe and reliable. Because the cables are integrated in the channel steel, the overall appearance is neat, simple and beautiful.

[0036] The water cooling process implemented in this embodiment is as follows: deionized water enters from two water inlets a and b, and then is divided into four parts respectively, and enters four units to form four water circulation units 23. The inlet / return main pipeline 21 is connected to the inlet / return branch pipeline 22 through a flange to form an inlet / return circulation water circuit, which together form two completely independent water circulation systems 2a and b. The water supply units of the two water circulation systems 2 of a and b are located on the left side above the cavity, forming the water inlet units of the four cavity units; the water return units of the two systems a and b are located on the right side above the cavity, forming the water return units of the four cavity units. Each water circulation unit 23 is divided into inlet and return, with a total of 32 circulating water routes, 20 of which are used to cool the cavity, and the remaining 12 routes are used to cool other auxiliary equipment. The 20 water inlet and return units of four identical cavities all use 14mm diameter pipes; the other 12 water lines use 8mm diameter pipes, and 32 water lines are used to cool the cavity and its accessories. The water flow of the branch pipes of each cavity passes through two main pipes and finally forms its own water inlet and return system; that is, the 14mm diameter pipes have 20 inlets and 20 returns, and the 8mm diameter pipes have 12 inlets and 12 returns; the water inlet and return systems of each cavity are located above each cavity and are in symmetrical positions for easy operation; the staggered design is used in space for easy operation; each line has a water flow switch 32 with digital output, and the two circulation systems a and b can achieve the tuning of the microwave field intensity in the cavity by changing the water temperature difference between the two systems.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Technical personnel in this industry can make some deformation and modifications under the inspiration of this technical solution. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An RFQ water supply system that is easy to monitor and maintain in real time, characterized by: The water supply system includes a mounting bracket, a water circulation system and a real-time monitoring system. The mounting bracket is a cantilever beam lattice structure in the shape of a "7" as a whole, which is installed above the RFQ accelerator cavity. The water circulation system and the real-time monitoring system are installed on the mounting bracket; The vertical beams on both sides of the mounting bracket are provided with ladders, a water circulation pipe is suspended on the horizontal beam, and the RFQ accelerator cavity is installed directly below the water circulation pipe; the horizontal beam and the vertical beam are both made of channel steel, which serves as the data line routing trough; The water circulation system comprises N groups of water circulation pipe groups, N inlets and N outlets, forming N groups of mutually independent water supply circulation systems, each group of water circulation pipe groups comprises an inlet / return main pipe and an inlet / return branch pipe, the inlet / return main pipe of each group of water circulation pipe groups is branched to form an even number of water circulation units just above the accelerator cavity, and the circulating water inlet and return pipes of each water circulation unit in space are arranged in a mirror distribution with the center line of the cavity; each water circulation unit is divided into inlet and return pipes to form multiple circulation water, part of the multiple circulation water is used to cool the cavity, and part is used to cool other auxiliary equipment, and the inlet pipe and return pipe of any circulation water in space correspond one to one in a front-to-back order; The real-time monitoring system includes a data acquisition box, a water flow switch and a control center. The number of the data acquisition boxes is the same as the water circulation units, and the electrical signals of the water flow of different water circulation units are respectively monitored and collected in real time; A water flow switch is installed on each circulating water pipeline to monitor the water flow in the pipeline in real time. As the collection terminal point of the water flow switch signal of the pipeline, the data acquisition panel collects the water flow signals of each pipeline in the water circulation unit and transmits the water flow sensor data of each pipeline to the control center through their respective cable lines.

2. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 is characterized in that: The data acquisition box is placed in the shielding box via the data acquisition panel, and the data acquisition box is installed on the crossbeam of the corresponding mounting bracket above the water circulation unit cavity.

3. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 is characterized in that: There is a distance between the water circulation system and the accelerator cavity, and the connection is achieved through a hose.

4. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 is characterized in that: Each water flow switch has its own data line connected to each input pin of the corresponding data acquisition panel. Each water flow switch corresponds to the pin name of the data acquisition panel one by one to form a data acquisition center. Each data acquisition panel transmits the signal back to the control center through a multi-core data line.

5. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 is characterized in that: Each of the data acquisition panels transmits signals back to the control center via a multi-core data line, including one switch quantity summary signal and one RS-485 communication signal.

6. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 or 5, characterized in that: The control center performs interlocking operations according to the summary signal, and reads the state of each water flow switch or sets shielding through RS-485 signals.

7. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 is characterized by: Each water circulation pipeline group includes an inlet / return main pipeline connected to an inlet / return branch pipeline through a flange to form an inlet / return circulation water circuit.

8. The RFQ water supply system that is convenient for real-time monitoring and maintenance according to claim 1 is characterized by: The water circulation system of the two groups of water circulation pipeline groups can achieve tuning of the microwave field intensity in the cavity by changing the water temperature difference between the two systems.

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