CN116095939A - Apparatus and method for reducing high frequency power reflection of large beam current back-spinning accelerator - Google Patents
Apparatus and method for reducing high frequency power reflection of large beam current back-spinning accelerator Download PDFInfo
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Abstract
The invention discloses a device and a method for reducing high-frequency power reflection of a large-beam back-rotation accelerator, wherein the device comprises a motor compensation quantity and current intensity relation comparison table module, a beam current intensity measuring module, a PLC central controller, a motor driving module, an upper computer auxiliary adjusting module and a stepping motor module; the method comprises the steps of establishing a flow intensity compensation relation comparison table; programming the test result to a PLC and an upper computer auxiliary adjusting module; the current flow intensity measurement information is sent to a PLC and an upper computer auxiliary adjustment module; the PLC receives a reverse sampling signal sent by the current directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module; when the motor is in a closed-loop working state, the PLC automatically adjusts once at each node with integral multiple of 100 mu A; an operator judges whether manual adjustment is needed according to the reflection signal, the flow intensity signal and the flow direction compensation relation comparison table information displayed on the current upper computer; the invention reduces the possibility of damage to the high frequency device by power reflection.
Description
Technical Field
The invention belongs to the technical field of cyclotrons, and particularly relates to a device and a method for reducing high-frequency power reflection of a large-beam-flow back-rotating accelerator.
Background
The high frequency system is one of the important parts of the cyclotron, and its stability and reliability play a key role in the performance of the cyclotron. The high frequency system of the cyclotron comprises four parts: high frequency power sources, transmission line systems, resonant cavities, and low level systems. The high-frequency power source and the resonant cavity are connected through a transmission line with a coupling device, and the coupling device has the meaning of not only feeding the high-frequency power output by the high-frequency power source into the cavity to generate a high-frequency electric field required for accelerating particles, but also carrying the function of impedance transformation.
The capacitive coupling mode is one of the coupling modes of the cyclotron. Capacitive coupling places a capacitance in the region of the strongest electric field (i.e., near the Dee plate) to excite the resonant cavity to produce the desired field.
A resonant cavity employing capacitive coupling can be generally equivalent to that shown in fig. 5:
C c is a coupling capacitance, and R, C, L are the equivalent impedance of the resonant cavity itself. R is R c When beam load exists, from the perspective of an equivalent circuit, the effective impedance of the resonant cavity is changed into R I R by a resistor which is connected in parallel with the resistor R in an equivalent way c . But in the absence of beam load, R c Is absent.
In the absence of beam load, R, C, L and resonance frequency omega 0 No-load quality factor Q 0 Equivalent voltage V of accelerating gap eff The total cavity loss power P has the following relationship:
the input impedance is:
the optimal coupling condition is Z r ＝Z 0 ,Z i ＝0。(Z 0 For transmission line characteristic impedance, ω is the operating frequency
Order the
I.e. the optimal coupling state is +.>
But in the presence of beam load, due to R c The effective impedance of the equivalent circuit diagram is changed, so that the optimal coupling state is broken, and the larger the beam current is, the more obvious the impedance change is, and the worse the coupling state is, so that the cyclotron for large beam current needs to adjust the coupling device during the working period, and the mismatching phenomenon caused by the change of the coupling state is prevented, otherwise, high-power reflection is caused, and reflected power can be transmitted back to the high-frequency power source along the transmission line, so that the high-frequency power source or the transmission system is damaged.
Currently cyclotrons, when handling coupling devices, are often not manually adjustable during operation of the accelerator due to the fact that they are often limited by practical conditions such as space, etc. Therefore, the general processing method is as follows: the cavity and the power source are in an over-coupling state when no beam is generated, and the cavity and the power source are automatically transited to a close matching state along with the increase of the beam intensity and the energy. This approach is possible in the case of small beam currents, becauseIs R c The variation range of (c) is not large, and can be formed in an approximately matched state. But for large beam cyclotrons, R c The amount of variation is much larger and a method for reducing the reflection of high frequency power of the large beam back-spinning accelerator is necessary, otherwise the safety and reliability of high frequency cannot be ensured.
Disclosure of Invention
The invention provides a device and a method for reducing high-frequency power reflection of a large-beam gyratory accelerator, which aim to solve the problem that the prior art only can solve the high-frequency power reflection of a small-beam gyratory accelerator, but cannot solve the problem that the large-beam gyratory accelerator can not solve the problem that R is caused by the R during the loading of a beam c The coupling condition is deteriorated, and the reflected power is greatly increased.
The invention provides the following technical scheme for solving the technical problems:
a device for reducing high frequency power reflection of a large beam back-flow rotary accelerator, characterized by: the device comprises a motor compensation quantity and current intensity relation comparison table module, a beam current intensity measurement module, a PLC central controller, a motor driving module, an upper computer auxiliary regulation module and a stepping motor module; the motor compensation quantity and current intensity relation comparison table module is used for providing test results of the direction and distance to be compensated of the motor under different current intensities for the PLC central controller; the beam intensity measuring module is used for providing the current beam intensity value for the PLC central controller; the upper computer auxiliary adjusting module is used for compensating the deviation of the motor compensation quantity theoretical value and the motor compensation quantity actual value under the emergency; the PLC central controller receives the comparison information of the motor compensation quantity and the current intensity relationship and the beam intensity information, calculates the compensation quantity of the current motor, and outputs the current motor compensation quantity instruction to the motor driving module; the PLC central controller also receives a reverse sampling signal of the directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module, and an operator judges whether manual adjustment is needed according to the reflection signal, the current intensity signal and the current intensity compensation relation comparison table information displayed on the current upper computer; and the manual adjusting signal of the upper computer auxiliary adjusting module is also received, and the stepping motor is controlled according to the motor compensation amount sent by the upper computer auxiliary adjusting module.
Further, the PLC central controller comprises a reverse sampling signal receiving sub-module, a flow intensity compensation relation receiving sub-module, a beam intensity receiving sub-module and a calculation compensation sub-module; the calculation compensation quantum module obtains the motor compensation quantity corresponding to each beam intensity from the current intensity compensation relation receiving sub-module, obtains the current beam intensity from the current intensity receiving sub-module, and then sends the corresponding motor compensation quantity instruction to the motor driving module; the calculation compensation quantum module receives the current motor open-loop or closed-loop state information of the upper computer auxiliary adjusting module, receives the manual motor compensation amount information sent by the upper computer auxiliary adjusting module, judges the current state, sends an instruction to the motor driving module if the current state is the open-loop state, and controls the stepping motor according to the motor compensation amount sent by the upper computer auxiliary adjusting module; if the current state is a closed loop state, sending an instruction to a motor driving module, and controlling the stepping motor according to a pre-test result; the reverse sampling signal receiving submodule receives the reverse sampling signal sent by the directional coupler and sends the signal to the upper computer auxiliary adjusting module.
Further, the upper computer auxiliary adjusting module comprises a reverse sampling signal receiving sub-module, a stream intensity compensation relation receiving sub-module, a beam intensity receiving sub-module, an open loop and closed loop switching sub-module and a manual adjusting signal sending sub-module; the open loop and closed loop switching sub-module receives the beam intensity sent by the sub-module according to the beam intensity the information is sent to a current flow intensity compensation relation receiving sub-module to search the motor compensation quantity corresponding to the current flow intensity, judging whether the current motor compensation quantity reaches a preset compensation result in a comparison table according to the reverse sampling signal received by the reverse sampling signal receiving sub-module, if not, selecting the current state as an open-loop state, and sending the state information to a calculation compensation quantum module of the PLC central controller; and then clicking a motor movement button on the operation interface, wherein each click represents one cell of motor movement, and information of each movement of the motor is sent to a calculation compensation quantum module of the PLC central controller.
Further, the motor compensation amount and current intensity relation comparison table module sets an ID number at each node of 100uA integer times, and the current beam intensity, motor compensation amount and motor compensation direction corresponding to the ID number, and the comparison table information is programmed into the PLC central controller to control the stepping motor according to the current beam intensity and the motor compensation amount corresponding to the current beam intensity in the comparison table.
A method for reducing high frequency power reflection from a bulk beam back-spinning accelerator comprising the steps of:
step one, establishing a relation comparison table of the motor compensation quantity and the current intensity, testing a stable value of the relation between the motor compensation quantity and the current intensity, and filling the relation comparison table;
programming the test result to a PLC central controller, sending the test result to an upper computer auxiliary adjusting module, and setting a motor electronic ruler for feedback so that the motor movement distance is more accurate;
step three, starting an accelerator, and increasing the flow intensity from 0;
step four, the current flow intensity measurement information is sent to a PLC central controller and an upper computer auxiliary adjusting module;
step five, the PLC central controller receives the reverse sampling signal sent by the current directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module;
step six, when the motor is in a closed-loop working state, the PLC central controller automatically adjusts once at each node which is 100 mu A integer times according to the current flow intensity value, and the adjustment mode is according to the moving direction and the distance of the motor in the measured relation comparison table, so that the distance between a capacitive disc of the coupling device and the Dee board is changed, and the capacitive coupling quantity is changed;
step seven, an operator judges whether manual adjustment is needed according to the reflection signal, the flow intensity signal and the flow direction compensation relation comparison table information displayed on the current upper computer, if not, the step six is returned, if the manual adjustment is needed, the motor is selected to be in an open-loop state on the operation interface, meanwhile, an open-loop state signal is sent to the PLC central controller, then a motor action button is manually adjusted, and each manual adjustment signal is sent to the PLC central controller;
step eight, the PLC judges whether a manual adjustment signal is received currently, and if the manual adjustment signal is received, the step motor is driven according to a manual adjustment instruction;
step nine, enabling the motor to be closed loop again after manual adjustment by an operator is completed, and returning to the step six.
Further, the specific process of the first step is as follows:
1) Installing the capacitive coupling device;
2) When the current intensity is increased to the maximum intensity after the accelerator is started, the current intensity is obtained by using the beam intensity measuring module, and the current intensity is displayed on the man-machine interaction interface of the upper computer in real time;
3) Manually operating the moving direction and distance of the motor on the man-machine interaction interface, and manually adjusting the motor according to the actual condition of the reflected signal to enable the reflection to descend and the accelerator to be in a better matching state;
4) The above process is repeated continuously for multiple times, and finally, a corresponding table of the direction and the distance to be compensated by the motor under different flow strengths can be obtained.
Advantageous effects of the invention
The invention aims at a large-beam-current rotary accelerator and is characterized by R during the beam load period c The coupling condition caused by the generation of the (a) is poor, and the reflected power is greatly increased, and a novel method for reducing the high-frequency power reflection of the large-beam back-flow rotary accelerator is designed. The method is independent of the original low-level system, and designs a self-adjusting coupling capacitor C c The coupling loop can change the coupling capacitance C between the high-frequency power source and the resonant cavity in real time according to the change condition of the current intensity when the current intensity of the large-current gyratory accelerator is gradually increased through monitoring the current intensity of the current intensity measuring system c Is of a size such that two areThe coupling matching state is good, the possibility of damage of power reflection to high-frequency equipment is greatly reduced, the feed-in power between a high-frequency power source and a resonant cavity is improved, the power reflection is reduced, and the stability and the reliability of a high-frequency system and even a cyclotron are effectively improved.
Drawings
FIG. 1 is a schematic diagram of an apparatus for reducing high frequency power reflection from a large beam back-spinning accelerator in accordance with the present invention;
FIG. 2a is a functional block diagram of an upper computer auxiliary adjusting module according to the present invention;
FIG. 2b is a schematic diagram of a human-computer interface of the upper computer auxiliary adjusting module according to the present invention;
FIG. 3 is a functional block diagram of a PLC central controller according to the present invention;
FIG. 4 is a table showing the relationship between the motor compensation amount and the current intensity.
Fig. 5 is a schematic diagram of a capacitively coupled resonator.
Detailed Description
Principle of design of the invention
1. The invention has the design difficulty
The difficulty is that the object being processed is a large beam back-spinning accelerator rather than a small beam back-spinning accelerator, and that such large beam back-spinning accelerator reflections are dynamically changing or even uncontrollable. The small beam flow back rotating accelerator generally adopts an over-coupling method for the coupling capacitance processing method, and when no beam flows, the R is estimated when the beam flows exist, so that the R is connected in parallel c The time resistance changes to a desired value, but this "precompensation" method is limited to small beam current, R c When the value does not change much. For large beam current spinning accelerators, the load is very variable and there is load fluctuation because the beam current load is continuously variable with increasing current intensity during the starting process of the accelerator. If the over-coupling method for processing the small beam current to the spin-accelerator is also used, the matching is poor when the large beam current accelerator is just started, even the power cannot be fed in, and the beam cannot be output. The principle of the load being continuously changed is shown in figure 5, in the case of beam load, due to R c Resulting in effective impedance of the equivalent circuit diagramChanges and R as the flow strength increases during the start of the accelerator c The value of (2) is also gradually increased and changed, due to R c The coupling matching effect is poorer and worse, so that the value of the backward sampling from the directional coupler is also increased continuously; the load is fluctuating or uncontrollable, because environmental factors are not controllable, so that there is always a gap between theory and practice. As the beam current increases during the starting process of the accelerator, the impedance change becomes more obvious, the coupling state becomes worse, if the coupling device cannot be effectively adjusted during the starting process of the accelerator, high-power reflection is caused, and reflected power can be transmitted back to the high-frequency power source along the transmission line, so that the high-frequency power source or the transmission system is damaged.
2. Dynamic control principle
First, design principles combining dynamic design and static design; the dynamic design is that the beam intensity is measured in real time and the motor is moved in real time. The static design is to pre-establish a comparison table of the motor compensation quantity and the current intensity. The dynamic design and the static design are combined, namely the beam current real-time measurement and the motor compensation quantity depend on a comparison table of the motor compensation quantity and the current intensity obtained through repeated tests, and because the motor compensation quantity corresponding to each current intensity in the comparison table is the motor compensation quantity which is proved to be effective through repeated measurement, compared with a method for instantly calculating the motor compensation quantity according to the current intensity, the method has the advantages of quick response, low delay, slow response and high delay caused by extremely complex algorithm of the instantly calculated motor compensation quantity, and therefore, the calculated motor compensation quantity can not necessarily effectively reduce the reflected power. The motor compensation amount given for each flow intensity value in the comparison table is a conclusion that the repeated test proves that the reflected power can be effectively reduced.
Secondly, designing a principle of combining theoretical design and manual adjustment; the theoretical design is a design obtained according to a certain range of experience and theory, and the theoretical design is a design based on a comparison table of motor compensation quantity and current intensity; the manual adjustment is based on the design of 'upper computer auxiliary adjustment'. If the theoretical design is not available, the upper computer auxiliary adjusting module does not have a judgment basis, for example, the current flow intensity is 100 mu A, the current flow intensity is searched in a comparison table, the backward sampling signal after motor compensation should have a descending trend, and the reflection is reduced and even approaches to 0. If the reflected signal is not in a range close to 0 but is far beyond the range, the theoretical design motor compensation amount cannot solve the problem of large current reflected power, because the theoretical design does not consider the environmental factors under the emergency, but the reflected power caused by the environmental factors under the emergency rises, the reflected power cannot be reduced according to the conventional motor compensation amount, and the reflected power under the emergency cannot be reduced by automatic control only until the reflected power is reduced to the allowable range. Therefore, the theoretical design must be combined with manual adjustment to perfectly solve the various problems. Similarly, manual adjustment is also dependent on theoretical design. Without theoretical design, manual adjustment has no judgment basis.
Based on the principle of the invention, the invention designs a device for reducing high-frequency power reflection of a large-beam current rotary accelerator, which is shown in fig. 1, 2a, 2b, 3 and 4, and is characterized in that: the device comprises a motor compensation quantity and current intensity relation comparison table module, a beam current intensity measurement module, a PLC central controller, a motor driving module, an upper computer auxiliary regulation module and a stepping motor module; the motor compensation quantity and current intensity relation comparison table module is used for providing test results of the direction and distance to be compensated of the motor under different current intensities for the PLC central controller; the beam intensity measuring module is used for providing the current beam intensity value for the PLC central controller; the upper computer auxiliary adjusting module is used for compensating the deviation of the motor compensation quantity theoretical value and the motor compensation quantity actual value under the emergency; the PLC central controller receives the comparison information of the motor compensation quantity and the current intensity relationship and the beam intensity information, calculates the compensation quantity of the current motor, and outputs the current motor compensation quantity instruction to the motor driving module; the PLC central controller also receives a reverse sampling signal of the directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module, and an operator judges whether manual adjustment is needed according to the reflection signal, the current intensity signal and the current intensity compensation relation comparison table information displayed on the current upper computer; and the manual adjusting signal of the upper computer auxiliary adjusting module is also received, and the stepping motor is controlled according to the motor compensation amount sent by the upper computer auxiliary adjusting module.
Further, the PLC central controller comprises a reverse sampling signal receiving sub-module, a flow intensity compensation relation receiving sub-module, a beam intensity receiving sub-module and a calculation compensation sub-module; the calculation compensation quantum module obtains the motor compensation quantity corresponding to each beam intensity from the current intensity compensation relation receiving sub-module, obtains the current beam intensity from the current intensity receiving sub-module, and then sends the corresponding motor compensation quantity instruction to the motor driving module; the calculation compensation quantum module receives the current motor open-loop or closed-loop state information of the upper computer auxiliary adjusting module, receives the manual motor compensation amount information sent by the upper computer auxiliary adjusting module, judges the current state, sends an instruction to the motor driving module if the current state is the open-loop state, and controls the stepping motor according to the motor compensation amount sent by the upper computer auxiliary adjusting module; if the current state is a closed loop state, sending an instruction to a motor driving module, and controlling the stepping motor according to a pre-test result; the reverse sampling signal receiving submodule receives the reverse sampling signal sent by the directional coupler and sends the signal to the upper computer auxiliary adjusting module.
Further, the upper computer auxiliary adjusting module comprises a reverse sampling signal receiving sub-module, a stream intensity compensation relation receiving sub-module, a beam intensity receiving sub-module, an open loop and closed loop switching sub-module and a manual adjusting signal sending sub-module; the open loop and closed loop switching sub-module receives the beam intensity sent by the sub-module according to the beam intensity the information is sent to a current flow intensity compensation relation receiving sub-module to search the motor compensation quantity corresponding to the current flow intensity, judging whether the current motor compensation quantity reaches a preset compensation result in a comparison table according to the reverse sampling signal received by the reverse sampling signal receiving sub-module, if not, selecting the current state as an open-loop state, and sending the state information to a calculation compensation quantum module of the PLC central controller; and then clicking a motor movement button on the operation interface, wherein each click represents one cell of motor movement, and information of each movement of the motor is sent to a calculation compensation quantum module of the PLC central controller.
Further, the motor compensation amount and current intensity relation comparison table module sets an ID number at each node of 100uA integer times, and the current beam intensity, motor compensation amount and motor compensation direction corresponding to the ID number, and the comparison table information is programmed into the PLC central controller to control the stepping motor according to the current beam intensity and the motor compensation amount corresponding to the current beam intensity in the comparison table.
A method for reducing high frequency power reflection from a bulk beam back-spinning accelerator comprising the steps of:
step one, establishing a relation comparison table of the motor compensation quantity and the current intensity, testing a stable value of the relation between the motor compensation quantity and the current intensity, and filling the relation comparison table;
programming the test result to a PLC central controller, sending the test result to an upper computer auxiliary adjusting module, and setting a motor electronic ruler for feedback so that the motor movement distance is more accurate;
step three, starting an accelerator, and increasing the flow intensity from 0;
step four, the current flow intensity measurement information is sent to a PLC central controller and an upper computer auxiliary adjusting module;
step five, the PLC central controller receives the reverse sampling signal sent by the current directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module;
step six, when the motor is in a closed-loop working state, the PLC central controller automatically adjusts once at each node which is 100 mu A integer times according to the current flow intensity value, and the adjustment mode is according to the moving direction and the distance of the motor in the measured relation comparison table, so that the distance between a capacitive disc of the coupling device and the DEE plate is changed, and the capacitive coupling quantity is changed;
step seven, an operator judges whether manual adjustment is needed according to the reflection signal, the flow intensity signal and the flow direction compensation relation comparison table information displayed on the current upper computer, if not, the step six is returned, if the manual adjustment is needed, the motor is selected to be in an open-loop state on the operation interface, meanwhile, an open-loop state signal is sent to the PLC central controller, then a motor action button is manually adjusted, and each manual adjustment signal is sent to the PLC central controller;
step eight, the PLC judges whether a manual adjustment signal is received currently, and if the manual adjustment signal is received, the step motor is driven according to a manual adjustment instruction;
step nine, enabling the motor to be closed loop again after manual adjustment by an operator is completed, and returning to the step six.
Further, the specific process of the first step is as follows:
1) Installing the capacitive coupling device;
2) When the current intensity is increased to the maximum intensity after the accelerator is started, the current intensity is obtained by using the beam intensity measuring module, and the current intensity is displayed on the man-machine interaction interface of the upper computer in real time;
3) Manually operating the moving direction and distance of the motor on the man-machine interaction interface, and manually adjusting the motor according to the actual condition of the reflected signal to enable the reflection to descend and the accelerator to be in a better matching state;
4) The above process is repeated continuously for multiple times, and finally, a corresponding table of the direction and the distance to be compensated by the motor under different flow strengths can be obtained.
Example 1
The device comprises a motor compensation quantity and current intensity relation comparison table module, a beam current intensity measurement module, a PLC central controller, a motor driving module, an upper computer auxiliary regulation module and a stepping motor module; the motor compensation quantity and current intensity relation comparison table module is used for providing test results of the direction and distance to be compensated of the motor under different current intensities for the PLC central controller; the beam intensity measuring module is used for providing the current beam intensity value for the PLC central controller; the upper computer auxiliary adjusting module is used for compensating the deviation of the motor compensation quantity theoretical value and the motor compensation quantity actual value under the emergency; the PLC central controller receives the comparison information of the motor compensation quantity and the current intensity relationship and the beam intensity information, calculates the compensation quantity of the current motor, and outputs the current motor compensation quantity instruction to the motor driving module; the PLC central controller also receives a reverse sampling signal of the directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module, and an operator judges whether manual adjustment is needed according to the reflection signal, the current intensity signal and the current intensity compensation relation comparison table information displayed on the current upper computer. The implementation method comprises the following steps:
firstly, according to the physical design of the resonant cavity and the actual space, the installation position of the capacitive coupling device is determined, the capacitive coupling device is installed at the lower end opening of the resonant cavity, and the distance between the capacitive disc of the coupling device and the Dee board can be adjusted by adjusting the movement of the motor, so that the capacitive coupling amount is changed.
Secondly, whether the coupling degree is adjusted is judged according to the parameter of the current intensity, so that a beam intensity detection system is needed, and the coupling device is subjected to one-time adjustment of the coupling capacitance when the current intensity is in the value of integral multiple of each 100 mu A. Considering that the change of the coupling capacitance also affects the change of the operating frequency, the tuning loop of the low-level system is operated as usual, and the operating frequency is kept unchanged.
Thirdly, testing the relative compensation quantity required by the coupling capacitance of the section near the integral multiple of the current intensity under different current intensity conditions, especially 100 mu A, recording the data of the motor movement of each compensation point, inputting the data into the PLC, enabling the PLC controller to automatically control the motor to move corresponding distances when the current intensity changes by 100 mu A, and setting an electronic ruler to feed back so that the motor movement distance is more accurate. In order to better improve the safety and stability of the method and prevent uncontrollable emergency, a standby method is provided: the directional coupler is utilized to obtain a reflection sampling signal from the transmission line, the reflection sampling signal can be displayed on the man-machine interaction interface of the upper computer in real time, meanwhile, the man-machine interaction interface can manually operate the moving direction and the distance of the motor, manual fine adjustment can be selected again according to the reflection change displayed in real time after each automatic adjustment of the compensation point, and therefore the safety of the high-frequency system is better guaranteed.
Fourth, the realization of man-machine interaction display of the sampling signals on the upper computer: the sampling signal is an analog quantity, the sampling signal is transmitted to the PLC for AD conversion, and then the voltage signal is calculated by a formula, assembled and converted into a power signal to be reflected on a human-computer interface, so that the reflected power can be monitored in real time.
Fifth, realization of automatic motor adjustment: the human-computer interface selects a closed-loop state, the motor can select a stepping motor, the PLC sends out instructions at each compensation point according to the data of the beam measurement system, the stepping angle of the stepping motor is controlled by sending out pulse signals to control the movement direction and distance of the stepping motor, and an electronic ruler is arranged to feed back the movement condition of the motor, so that the step loss condition is prevented.
Sixth, the manual adjustment of the motor is realized: the open-loop state is selected on the man-machine interaction interface, the moving direction and the stepping distance of the motor are selected according to actual conditions, the upper computer sends a command to the lower computer PLC, and the PLC controls the motor driver to realize the motor moving function.
It should be emphasized that the above-described embodiments are merely illustrative of the invention, which is not limited thereto, and that modifications may be made by those skilled in the art, as desired, without creative contribution to the above-described embodiments, while remaining within the scope of the patent laws.
Claims (6)
1. An apparatus for reducing high frequency power reflection from a large beam back-spinning accelerator, comprising: the device comprises a motor compensation quantity and current intensity relation comparison table module, a beam current intensity measurement module, a PLC central controller, a motor driving module, an upper computer auxiliary regulation module and a stepping motor module; the motor compensation quantity and current intensity relation comparison table module is used for providing test results of the direction and distance to be compensated of the motor under different current intensities for the PLC central controller; the beam intensity measuring module is used for providing the current beam intensity value for the PLC central controller; the upper computer auxiliary adjusting module is used for compensating the deviation of the motor compensation quantity theoretical value and the motor compensation quantity actual value under the emergency; the PLC central controller receives the comparison information of the motor compensation quantity and the current intensity relationship and the beam intensity information, calculates the compensation quantity of the current motor, and outputs the current motor compensation quantity instruction to the motor driving module; the PLC central controller also receives a reverse sampling signal of the directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module, and an operator judges whether manual adjustment is needed according to the reflection signal, the current intensity signal and the current intensity compensation relation comparison table information displayed on the current upper computer; and the manual adjusting signal of the upper computer auxiliary adjusting module is also received, and the stepping motor is controlled according to the motor compensation amount sent by the upper computer auxiliary adjusting module.
2. An apparatus for reducing high frequency power reflection from a large beam back-spinning accelerator as defined in claim 1, wherein: the PLC central controller comprises a reverse sampling signal receiving sub-module, a flow intensity compensation relation receiving sub-module, a beam intensity receiving sub-module and a calculation compensation quantum module; the calculation compensation quantum module obtains the motor compensation quantity corresponding to each beam intensity from the current intensity compensation relation receiving sub-module, obtains the current beam intensity from the current intensity receiving sub-module, and then sends the corresponding motor compensation quantity instruction to the motor driving module; the calculation compensation quantum module receives the current motor open-loop or closed-loop state information of the upper computer auxiliary adjusting module, receives the manual motor compensation amount information sent by the upper computer auxiliary adjusting module, judges the current state, sends an instruction to the motor driving module if the current state is the open-loop state, and controls the stepping motor according to the motor compensation amount sent by the upper computer auxiliary adjusting module; if the current state is a closed loop state, sending an instruction to a motor driving module, and controlling the stepping motor according to a pre-test result; the reverse sampling signal receiving submodule receives the reverse sampling signal sent by the directional coupler and sends the signal to the upper computer auxiliary adjusting module.
3. An apparatus for reducing high frequency power reflection from a large beam back-spinning accelerator as defined in claim 1, wherein: the upper computer auxiliary adjusting module comprises a reverse sampling signal receiving sub-module, a flow intensity compensation relation receiving sub-module, a beam intensity receiving sub-module, an open loop and closed loop switching sub-module and a manual adjusting signal sending sub-module; the open loop and closed loop switching sub-module receives the beam intensity received by the sub-module according to the beam intensity the information is sent to a current flow intensity compensation relation receiving sub-module to search the motor compensation quantity corresponding to the current flow intensity, judging whether the current motor compensation quantity reaches a preset compensation result in a comparison table according to the reverse sampling signal received by the reverse sampling signal receiving sub-module, if not, selecting the current state as an open-loop state, and sending the state information to a calculation compensation quantum module of the PLC central controller; and then clicking a motor movement button on the operation interface, wherein each click represents one cell of motor movement, and information of each movement of the motor is sent to a calculation compensation quantum module of the PLC central controller.
4. An apparatus for reducing high frequency power reflection from a large beam back-spinning accelerator as defined in claim 1, wherein: the comparison table module of the relation between the motor compensation quantity and the current intensity sets an ID number at each node of 100uA integral multiple, and the current intensity, the motor compensation quantity and the motor compensation direction corresponding to the ID number, and the comparison table information is programmed into the PLC central controller to control the stepping motor according to the current intensity and the motor compensation quantity corresponding to the current intensity in the comparison table.
5. A method for reducing high frequency power reflection of a large beam back-spinning accelerator based on an apparatus for reducing high frequency power reflection of a large beam back-spinning accelerator as defined in any one of claims 1-4, comprising the steps of:
step one, establishing a relation comparison table of the motor compensation quantity and the current intensity, testing a stable value of the relation between the motor compensation quantity and the current intensity, and filling the relation comparison table;
programming the test result to a PLC central controller, sending the test result to an upper computer auxiliary adjusting module, and setting a motor electronic ruler for feedback so that the motor movement distance is more accurate;
step three, starting an accelerator, and increasing the flow intensity from 0;
step four, the current flow intensity measurement information is sent to a PLC central controller and an upper computer auxiliary adjusting module
Step five, the PLC central controller receives the reverse sampling signal sent by the current directional coupler and sends the reverse sampling signal to the upper computer auxiliary adjusting module;
step six, when the motor is in a closed-loop working state, the PLC central controller automatically adjusts once at each node which is 100 mu A integer times according to the current flow intensity value, and the adjustment mode is according to the moving direction and the distance of the motor in the measured relation comparison table, so that the distance between a capacitive disc of the coupling device and the DEE plate is changed, and the capacitive coupling quantity is changed;
step seven, an operator judges whether manual adjustment is needed according to the reflection signal, the flow intensity signal and the flow direction compensation relation comparison table information displayed on the current upper computer, if not, the step six is returned, if the manual adjustment is needed, the motor is selected to be in an open-loop state on the operation interface, meanwhile, an open-loop state signal is sent to the PLC central controller, then a motor action button is manually adjusted, and each manual adjustment signal is sent to the PLC central controller;
step eight, the PLC judges whether a manual adjustment signal is received currently, and if the manual adjustment signal is received, the step motor is driven according to a manual adjustment instruction;
step nine, enabling the motor to be closed loop again after manual adjustment by an operator is completed, and returning to the step six.
6. The method for reducing high frequency power reflection from a bulk beam back-up spinning accelerator of claim 5, wherein said step one is performed as follows:
1) Installing the capacitive coupling device;
2) When the current intensity is increased to the maximum intensity after the accelerator is started, the current intensity is obtained by using the beam intensity measuring module, and the current intensity is displayed on the man-machine interaction interface of the upper computer in real time;
3) Manually operating the moving direction and distance of the motor on the man-machine interaction interface, and manually adjusting the motor according to the actual condition of the reflected signal to enable the reflection to descend and the accelerator to be in a better matching state;
4) The above process is repeated continuously for multiple times, and finally, a corresponding table of the direction and the distance to be compensated by the motor under different flow strengths can be obtained.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117500138A (en) * | 2023-10-19 | 2024-02-02 | 北京核力同创科技有限公司 | Beam load dynamic matching method for low-frequency, high-energy and high-current accelerator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117500138A (en) * | 2023-10-19 | 2024-02-02 | 北京核力同创科技有限公司 | Beam load dynamic matching method for low-frequency, high-energy and high-current accelerator |
| CN117500138B (en) * | 2023-10-19 | 2024-04-26 | 国电投核力同创(北京)科技有限公司 | Beam load dynamic matching method for low-frequency, high-energy and high-current accelerator |
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