CN112996214B - Magnetic field stability control system and method - Google Patents
Magnetic field stability control system and method Download PDFInfo
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- CN112996214B CN112996214B CN202110188888.6A CN202110188888A CN112996214B CN 112996214 B CN112996214 B CN 112996214B CN 202110188888 A CN202110188888 A CN 202110188888A CN 112996214 B CN112996214 B CN 112996214B
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
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Abstract
The invention relates to a magnetic field stability control system and a method, which are characterized by comprising a magnet, a magnetic field sensor, a magnetic field measurement system, an industrial personal computer, a digital controller and a magnet power supply; at least three magnetic field sensors are arranged on the uniform field area of the magnet at intervals; the magnetic field measurement system is used for outputting standard voltage analog signals or standard current analog signals of the magnetic field size measured by the magnetic field sensors in real time after processing analog signals measured by the magnetic field sensors; the industrial personal computer is used for setting a working magnetic field set value of the magnet and parameters of the digital controller; the digital controller is used for executing a digital closed-loop control algorithm and determining a standard voltage control signal or a standard current control signal of the magnet power supply; the magnet power supply is used for providing exciting current for the magnet in real time according to the standard voltage control signal or the standard current control signal and the corresponding relation of the numerical values of the I/B magnetic measurement curve, and the invention can be widely applied to the field of magnetic restraint beam control of accelerators.
Description
Technical Field
The invention relates to a magnetic field stability control system and a magnetic field stability control method, and belongs to the field of magnetic confinement beam control of accelerators.
Background
Along with basic scientific researches such as accelerator physics, particle physics and the like and application and development of the accelerator in the field of high-end experimental instruments, the requirements of people on control indexes of charged particle tracks running in the accelerator are higher and higher, and the requirements on the stability of a magnetic field of the accelerator are higher.
During particle accelerator beam operation, charged particles are operated for a long period of time in a vacuum tube of finite circumference at a maximum near light velocity. Therefore, it is necessary to provide a high-precision magnet system and a high-precision, high-stability magnet power system to provide a high-precision magnetic field and magnetic field pattern to ensure the stability of the track of the beam. In addition, for some high-precision instruments, such as high-precision secondary ion mass spectrometers, to increase the analysis speed, analysis capacity and in-situ resolution precision of isotope samples, high-precision, high-stability magnets and power systems are more needed to achieve the ultra-high stability magnetic fields required for rapid pulse mass spectrometry.
However, high precision magnets and high precision, high stability power systems mean a doubling of equipment development costs and difficulty. However, the prior art does not have a control system and method based on the magnets and power supply devices used by the existing conventional particle accelerators to improve the stability of the magnetic field.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a magnetic field stability control system and method for a particle accelerator, which is based on a magnet and a power supply device of an existing conventional particle accelerator, at low cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a magnetic field stability control system comprises a magnet, a magnetic field sensor, a magnetic field measurement system, an industrial personal computer, a digital controller and a magnet power supply;
at least three magnetic field sensors for collecting magnetic field analog signals generated by the magnet in real time are arranged on the uniform field area of the magnet at intervals;
the magnetic field measurement system is used for outputting standard voltage analog signals or standard current analog signals of the magnetic field size measured by the magnetic field sensors in real time after processing analog signals measured by the magnetic field sensors;
the industrial personal computer is used for setting a working magnetic field set value of the magnet, a magnet power supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range and parameters of the digital controller;
the digital controller is used for executing a digital closed-loop control algorithm, determining the magnetic field deviation between the working magnetic field set value of the magnet and the standard voltage analog signal or the standard current analog signal output by the magnetic field measurement system in real time, and determining the standard voltage control signal or the standard current control signal of the magnet power supply according to the magnet power supply current and the magnetic field error fluctuation range corresponding to the working magnetic field set value;
the magnet power supply is used for providing exciting current for the magnet in real time according to the standard voltage control signal or the standard current control signal and the corresponding relation of the numerical values of the I/B magnetic measurement curve.
Further, the industrial personal computer comprises a control interface, a parameter setting module and a monitoring module;
the control interface is used for controlling the controller and the magnet power supply to be turned on or turned off;
the parameter setting module is used for setting a working magnetic field set value of the magnet, a magnet power supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range and parameters of the digital controller;
the monitoring module is used for remotely monitoring the running states of the magnetic field measuring system, the digital controller and the magnet power supply.
Further, the digital controller comprises an ADC acquisition module, a data processing module and a DAC output module;
the ADC acquisition module is used for converting a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system in real time into a digital signal, and then sequentially carrying out high-pass, low-pass or band-pass filtering processing and differential operation to obtain a current magnetic field measurement value;
the data processing module is used for determining the magnetic field adjustment quantity of the magnet power supply in real time based on the parameters set by the industrial personal computer by adopting a digital PID algorithm, according to the working magnetic field set value of the magnet, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module;
the DAC output module is used for obtaining a standard voltage control signal or a standard current control signal of the magnet power supply through a standard voltage or current given signal according to the magnetic field adjustment quantity of the magnet power supply by adopting a data smoothing algorithm, and sending the standard voltage control signal or the standard current control signal to the magnet power supply through a control interface.
Further, the digital controller adopts a PID controller, and a control interface of the PID controller adopts a voltage signal interface of 0-10V; the precision of the ADC acquisition module is 24 bits, and the precision of the DAC output module is 16 bits.
Further, the accuracy of the magnetic field sensor is ± (0.02% of full scale+0.01% of measured value+0.00002) T; the magnetic field sensor has a sampling rate of up to 10kHz.
Further, the magnetic field sensor adopts a Hall probe.
Further, the magnetic field measurement system employs a magnetic field measurement transmitter.
A magnetic field stability control method, comprising:
1) At least three magnetic field sensors are arranged at intervals on the uniform field region of the magnet, and the magnetic field working range of the magnet is calibrated to be within a specific voltage signal range through a magnetic field measurement system;
2) The industrial personal computer remotely controls the digital controller and the magnet power supply to be started, and sets a working magnetic field set value of the magnet, a magnet power supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range and parameters of the digital controller;
3) Each magnetic field sensor acquires the analog signals of the magnetic field generated by the magnet in real time, and the magnetic field measurement system processes the analog signals acquired by each magnetic field sensor and then outputs standard voltage analog signals or standard current analog signals of the magnetic field size measured by the magnetic field sensor in a specific voltage signal range in real time;
4) The digital controller executes a digital closed-loop control algorithm, determines the magnetic field deviation between a working magnetic field set value of the magnet and a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system in real time, and determines a standard voltage control signal of a magnet power supply according to the magnet power supply current and the magnetic field error fluctuation range corresponding to the working magnetic field set value;
5) And the magnet power supply provides stable exciting current for the magnet in real time according to the standard voltage control signal or the standard current control signal and the corresponding relation of the numerical values of the I/B magnetic measurement curve.
Further, the specific process of the step 4) is as follows:
4.1 The ADC acquisition module converts a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system in real time into a digital signal, and then sequentially carries out high-pass, low-pass or band-pass filtering processing and differential operation to obtain a current magnetic field measurement value;
4.2 The data processing module adopts a digital closed-loop control algorithm, and determines the magnetic field adjustment quantity of the magnet power supply in real time based on parameters sent by the industrial personal computer according to the working magnetic field set value of the magnet, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module;
4.3 The DAC output module adopts a data smoothing algorithm, obtains a standard voltage control signal or a standard current control signal of the magnet power supply through a standard voltage or current given signal according to the magnetic field adjustment quantity of the magnet power supply, and sends the standard voltage control signal or the standard current control signal to the magnet power supply through a control interface to control the exciting current output by the magnet power supply to the magnet.
Further, in the step 4.1), the calibration of the magnetic field signal is performed in advance by combining with other magnetic field instruments, and the calibrated data curve is used for data correction between the standard voltage analog signal or the standard current analog signal acquired by the ADC acquisition module and the actual magnetic field value of the magnet.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention sets several magnetic field sensors to collect the analog signals of magnetic field generated by the magnet as the feedback value of magnetic field power correction output, compared with the traditional mode of indirectly calculating the magnetic field change by DCCT (direct current strong detector) current feedback value of power and I/B curve of the pre-measured magnet, it has the characteristics of more real and accurate feedback physical quantity.
2. The invention adopts a plurality of magnetic field sensors, can reduce the measurement error problem caused by the stability of a single magnetic field sensor or the interference of local environment by a multi-path data difference method, and improves the accuracy of the magnetic field acquisition value.
3. The controller is realized based on FPGA hardware, data communication of the magnetic field feedback value and the magnetic field power supply correction amount is transmitted through an analog circuit, digital coding and data processing links are reduced, and the controller has better instantaneity and quick system response capability.
4. The invention can realize the stability control of the magnetic field based on the existing magnetic field and the magnet power supply, has simple method, good feasibility and high equipment utilization rate, and can be widely applied to the field of magnetic confinement beam control of accelerators.
Drawings
FIG. 1 is a schematic diagram of a control system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of magnetic field feedback control of a control system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The magnetic field stability control system and method of the embodiment are based on a magnetic field feedback control principle and a rapid data processing principle, wherein the magnetic field feedback control is mainly implemented among a controller, a magnet, a magnetic field measurement system 3 and a magnetic field power supply, and analog quantity acquisition and accurate transmission of 0-10V are realized through a high-precision ADC (analog-to-digital converter) module and a DAC (digital-to-analog converter) module which are arranged in the controller. The data acquisition of the uniform magnetic field region in the magnetic field system adopts a plurality of magnetic field sensors 2, and the differential method of multipath data can reduce the measurement error problem caused by the stability of the single magnetic field sensor 2 or the local environment interference, and improve the accuracy of the magnetic field acquisition value of the magnet. The controller adopts a digital closed-loop control algorithm, and realizes the stability correction control of the magnetic field by rapidly adjusting the given exciting current of the magnet power supply 6 according to the fluctuation of the field magnetic field.
Example 1
As shown in fig. 1, the present embodiment provides a magnetic field stability control system including a magnet 1, a magnetic field sensor 2, a magnetic field measurement system 3, an industrial personal computer 4, a digital controller 5, and a magnet power supply 6.
The even field interval of magnet 1 is provided with at least three magnetic field sensor 2, and magnetic field measurement system 3 is all connected to each magnetic field sensor 2, and industrial computer 4 is respectively through network interface connection digital controller 5 and magnet power 6, and magnetic field measurement system 3 and magnet power 6 are connected respectively to digital controller 5, and magnet power 6 still connects magnet 1.
The magnetic field sensor 2 is used for acquiring analog signals of the magnetic field generated by the magnet 1 in real time.
The magnetic field measurement system 3 is configured to amplify, shape and linearly compensate for the analog signals collected by each magnetic field sensor 2, and then output, in real time, standard voltage analog signals or standard current analog signals of the magnetic field size within a specific magnetic field measurement range measured by the magnetic field sensor 2, so as to facilitate data acquisition and processing of the subsequent digital controller 5, where the specific magnetic field measurement range refers to a working magnetic field range of each magnet 1 adopted in each field, and for the same magnetic field precision requirement, the larger the magnetic field working range, the higher the requirement on the number of bits of the ADC for collecting analog signals carried by the magnetic field measurement system 3 itself, and if the magnetic field measurement range is low, the 12-bit ADC is adopted, and if the magnetic field measurement range is large, the 16-bit or 24-bit ADC is adopted.
The industrial personal computer 4 is used for setting the working magnetic field set value of the magnet 1, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the parameters of the digital controller 5 on line, and remotely controlling the work of the digital controller 5 and the magnet power supply 6.
The digital controller 5 is configured to execute a digital closed-loop control algorithm based on parameters set by the industrial personal computer 4, determine, in real time, a magnetic field deviation between a working magnetic field set value of the magnet 1 and a standard voltage analog signal or a standard current analog signal (i.e., a magnetic field feedback value) output by the magnetic field measurement system 3, and determine, according to a magnet supply current and a magnetic field error fluctuation range corresponding to the working magnetic field set value, a standard voltage control signal or a standard current control signal of the magnet power supply 6, so as to implement stable control of the magnet magnetic field signal by adjusting the exciting current of the magnet power supply 6 in real time.
The magnet power supply 6 is used for providing stable exciting current for the magnet 1 in real time according to a preset corresponding relation of the numerical value of the I/B magnetic measurement curve and the standard voltage control signal or the standard current control signal so as to obtain a stable magnetic field morphological structure conforming to an operation mode.
In a preferred embodiment, the industrial personal computer 4 comprises a control interface, a parameter setting module and a monitoring module.
The control interface is used for controlling the on or off of the digital controller 5 and the magnet power supply 6.
The parameter setting module is configured to preset a working magnetic field set value of the magnet 1, a magnet supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range, and parameters of the digital controller 5, where the parameters of the digital controller 5 include closed-loop control parameters, such as proportional, integral, and derivative parameters of a PID controller, and the closed-loop control parameters are determined according to relevant parameters of a field device and an actual device operation and debugging condition, where the field device includes the magnet 1, the industrial personal computer 4, and the magnet power supply 6, and the relevant parameters include a temperature of the magnet, a field environment temperature, a response of the magnet power supply 6 to the industrial personal computer 4, a response of the magnet 1 to an excitation current signal output by the magnet power supply 6, an execution time and a data processing precision of the digital controller 5, and the like.
The monitoring module is used for remotely monitoring the operation states of the magnetic field measuring system 3, the digital controller 5 and the magnet power supply 6.
In a preferred embodiment, the digital controller 5 may employ a PID (proportional-integral-derivative) controller including an ADC acquisition module, a data processing module, and a DAC output module.
The ADC acquisition module is configured to convert a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system 3 in real time into a digital signal, and sequentially perform high-pass, low-pass or band-pass filtering processing and differential operation to obtain a current magnetic field measurement value, so as to improve accuracy of the standard voltage analog signal or the standard current analog signal output by the magnetic field measurement system 3.
The data processing module is used for realizing error control between the current magnetic field measured value and the magnetic field set value, adopts a digital PID algorithm, and determines the magnetic field adjustment quantity of the magnet power supply 6 in real time based on the set value of the working magnetic field of the magnet 1, the magnet power supply current corresponding to the set value of the working magnetic field, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module.
The DAC output module is configured to obtain a standard voltage control signal or a standard current control signal of the magnet power supply 6 according to a standard voltage or current given signal by using a data smoothing algorithm and according to a magnetic field adjustment amount of the magnet power supply 6, and send the standard voltage control signal or the standard current control signal to the magnet power supply 6 through a control interface, so as to control the exciting current output to the magnet 1 by the magnet power supply 6.
In a preferred embodiment, the control interface of the PID controller can adopt a voltage signal interface of 0-10V; the accuracy of the ADC acquisition module is 24 bits, and the accuracy of the DAC output module is 16 bits.
In a preferred embodiment, the network interface may employ a 100/1000M Ethernet interface.
In a preferred embodiment, the accuracy of the magnetic field sensor 2 may be ± (0.02% of full scale+0.01% of measured value+0.00002) T, where T is the unit tesla of the magnetic field; the sampling rate of the magnetic field sensor 2 can be up to 10kHz.
In a preferred embodiment, the magnetic field sensor 2 may employ a hall probe.
In a preferred embodiment, the magnetic field measurement system 3 may employ a magnetic field measurement transmitter.
Example 2
As shown in fig. 2, the present embodiment provides a magnetic field stability control method, which includes the following steps:
1) At least three magnetic field sensors 2 are arranged at intervals on the uniform field region of the magnet 1, and the magnetic field working range of the magnet 1 is calibrated to be within a voltage signal range of 0-10V through a magnetic field measuring system 3 with a specific magnetic field range.
2) The industrial personal computer 4 remotely controls the digital controller 5 and the magnet power supply 6 to be started, and sets the working magnetic field set value of the magnet 1, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the parameters of the digital controller 5, specifically:
2.1 A control interface controls the digital controller 5 and the magnet power supply 6 to be turned on.
2.2 The parameter setting module sets the working magnetic field set value of the magnet 1, the power supply current of the magnet 1 corresponding to the working magnetic field set value and the parameters of the digital controller 5.
2.3 The monitoring module remotely monitors the operating states of the magnetic field measurement system 3, the digital controller 5 and the magnet power supply 6.
3) Each magnetic field sensor 2 collects the analog signals of the magnetic field generated by the magnet 1 in real time, and the magnetic field measuring system 3 outputs the standard voltage analog signals or the standard current analog signals of the magnetic field size measured by the magnetic field sensors 2 in 0-10V in real time after amplifying, shaping and temperature linear compensation of the analog signals collected by the magnetic field sensors 2.
4) The digital controller 5 executes a digital closed-loop control algorithm to determine the magnetic field deviation between the working magnetic field set value of the magnet 1 and the standard voltage analog signal or the standard current analog signal output by the magnetic field measurement system 3 in real time, and determines the standard voltage control signal of the magnet power supply 6 according to the magnet power supply current and the magnetic field error fluctuation range corresponding to the working magnetic field set value, specifically:
4.1 The ADC acquisition module converts a standard voltage analog signal or a standard current analog signal within 0-10V output by the magnetic field measurement system 3 in real time into a digital signal, and then sequentially carries out high-pass, low-pass or band-pass filtering processing and differential operation to obtain a current magnetic field measurement value. When the ADC module collects standard voltage analog signals or standard current analog signals, the calibration of the magnetic field signals is performed in advance by combining with other high-precision magnetic field instruments (for example, nuclear magnetic resonance) on the magnetic field of the magnet 1, and the calibrated data curve is used for data correction between the standard voltage analog signals or standard current analog signals collected by the ADC module and the actual magnetic field value of the magnet.
4.2 The data processing module adopts a digital closed-loop control algorithm, and based on parameters sent by the industrial personal computer 4, the magnetic field adjustment quantity of the magnet power supply 6 is determined in real time according to the working magnetic field set value of the magnet 1, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module:
the data processing module takes the working magnetic field set value of the magnet 1, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module as signal input, takes the magnetic field adjustment quantity of the magnet power supply 6 as signal output, and realizes the consistency of the magnetic field measured value and the magnetic field set value through a PID algorithm.
4.3 The DAC output module adopts a data smoothing algorithm, obtains a standard voltage control signal or a standard current control signal of the magnet power supply 6 through a standard voltage or current given signal according to the magnetic field adjustment quantity of the magnet power supply 6, and sends the standard voltage control signal or the standard current control signal to the magnet power supply 6 through a control interface to realize the control of the exciting current output to the magnet 1 by the magnet power supply 6:
the data smoothing algorithm of the invention is as follows: the broken line or the part with the jump in the standard voltage control signal curve or the standard current control signal curve output by the DAC output module is replaced by a parabolic fitting method, so that abrupt output of the magnet power supply 6 is avoided, the magnet power supply 6 can not respond timely due to too fast abrupt signal change, and the stability of magnetic field control can be improved by adopting data smoothing processing.
The parabolic smoothing processing method mainly adopts parabolic fitting broken lines, and comprises the following specific processes: firstly, taking two existing straight lines as tangent lines of parabolas; then, two tangent points are taken on the straight lines at the two ends of the folding point, and a parabolic equation is calculated according to the conditions; secondly, adopting a certain increment to calculate corresponding values one by one; finally, these values are sequentially outputted at intervals at which the magnet power supply 6 can react, that is, the smoothing process of the exciting current signal can be realized.
5) The magnet power supply 6 provides stable exciting current for the magnet 1 in real time according to the corresponding relation of the numerical values of the I/B magnetic measurement curve according to the standard voltage control signal or the standard current control signal so as to obtain a stable magnetic field morphological structure conforming to the operation mode.
The foregoing embodiments are only for illustrating the present invention, wherein the structures, connection modes, manufacturing processes, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. The magnetic field stability control system is characterized by comprising a magnet, a magnetic field sensor, a magnetic field measurement system, an industrial personal computer, a digital controller and a magnet power supply;
at least three magnetic field sensors for collecting magnetic field analog signals generated by the magnet in real time are arranged on the uniform field area of the magnet at intervals;
the magnetic field measurement system is used for outputting standard voltage analog signals or standard current analog signals of the magnetic field size measured by the magnetic field sensors in real time after processing analog signals measured by the magnetic field sensors;
the industrial personal computer is used for setting a working magnetic field set value of the magnet, a magnet power supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range and parameters of the digital controller;
the digital controller is used for executing a digital closed-loop control algorithm, determining the magnetic field deviation between the working magnetic field set value of the magnet and the standard voltage analog signal or the standard current analog signal output by the magnetic field measurement system in real time, and determining the standard voltage control signal or the standard current control signal of the magnet power supply according to the magnet power supply current and the magnetic field error fluctuation range corresponding to the working magnetic field set value;
the magnet power supply is used for providing exciting current for the magnet in real time according to the standard voltage control signal or the standard current control signal and the corresponding relation of the numerical values of the I/B magnetic measurement curve.
2. The magnetic field stability control system of claim 1, wherein the industrial personal computer comprises a control interface, a parameter setting module and a monitoring module;
the control interface is used for controlling the controller and the magnet power supply to be turned on or turned off;
the parameter setting module is used for setting a working magnetic field set value of the magnet, a magnet power supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range and parameters of the digital controller;
the monitoring module is used for remotely monitoring the running states of the magnetic field measuring system, the digital controller and the magnet power supply.
3. The magnetic field stability control system of claim 1, wherein the digital controller comprises an ADC acquisition module, a data processing module, and a DAC output module;
the ADC acquisition module is used for converting a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system in real time into a digital signal, and then sequentially carrying out high-pass, low-pass or band-pass filtering processing and differential operation to obtain a current magnetic field measurement value;
the data processing module is used for determining the magnetic field adjustment quantity of the magnet power supply in real time based on the parameters set by the industrial personal computer by adopting a digital PID algorithm, according to the working magnetic field set value of the magnet, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module;
the DAC output module is used for obtaining a standard voltage control signal or a standard current control signal of the magnet power supply through a standard voltage or current given signal according to the magnetic field adjustment quantity of the magnet power supply by adopting a data smoothing algorithm, and sending the standard voltage control signal or the standard current control signal to the magnet power supply through a control interface.
4. A magnetic field stability control system according to claim 3, wherein the digital controller is a PID controller, and the control interface of the PID controller is a voltage signal interface of 0-10V; the precision of the ADC acquisition module is 24 bits, and the precision of the DAC output module is 16 bits.
5. A magnetic field stability control system according to claim 1, wherein the accuracy of the magnetic field sensor is ± (0.02% + measured value 0.01% +0.00002 of full scale) T; the magnetic field sensor has a sampling rate of up to 10kHz.
6. A magnetic field stability control system as defined in claim 1 wherein said magnetic field sensor employs a hall probe.
7. The magnetic field stability control system of claim 1 wherein the magnetic field measurement system employs a magnetic field measurement transmitter.
8. A magnetic field stability control method, comprising:
1) At least three magnetic field sensors are arranged at intervals on the uniform field region of the magnet, and the magnetic field working range of the magnet is calibrated to be within a specific voltage signal range through a magnetic field measurement system;
2) The industrial personal computer remotely controls the digital controller and the magnet power supply to be started, and sets a working magnetic field set value of the magnet, a magnet power supply current corresponding to the working magnetic field set value, a magnetic field error fluctuation range and parameters of the digital controller;
3) Each magnetic field sensor acquires the analog signals of the magnetic field generated by the magnet in real time, and the magnetic field measurement system processes the analog signals acquired by each magnetic field sensor and then outputs standard voltage analog signals or standard current analog signals of the magnetic field size measured by the magnetic field sensor in a specific voltage signal range in real time;
4) The digital controller executes a digital closed-loop control algorithm, determines the magnetic field deviation between a working magnetic field set value of the magnet and a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system in real time, and determines a standard voltage control signal of a magnet power supply according to the magnet power supply current and the magnetic field error fluctuation range corresponding to the working magnetic field set value;
5) And the magnet power supply provides stable exciting current for the magnet in real time according to the standard voltage control signal or the standard current control signal and the corresponding relation of the numerical values of the I/B magnetic measurement curve.
9. The method for controlling the stability of a magnetic field according to claim 8, wherein the specific process of the step 4) is as follows:
4.1 The ADC acquisition module converts a standard voltage analog signal or a standard current analog signal output by the magnetic field measurement system in real time into a digital signal, and then sequentially carries out high-pass, low-pass or band-pass filtering processing and differential operation to obtain a current magnetic field measurement value;
4.2 The data processing module adopts a digital closed-loop control algorithm, and determines the magnetic field adjustment quantity of the magnet power supply in real time based on parameters sent by the industrial personal computer according to the working magnetic field set value of the magnet, the magnet power supply current corresponding to the working magnetic field set value, the magnetic field error fluctuation range and the current magnetic field measured value obtained by the ADC acquisition module;
4.3 The DAC output module adopts a data smoothing algorithm, obtains a standard voltage control signal or a standard current control signal of the magnet power supply through a standard voltage or current given signal according to the magnetic field adjustment quantity of the magnet power supply, and sends the standard voltage control signal or the standard current control signal to the magnet power supply through a control interface to control the exciting current output by the magnet power supply to the magnet.
10. The method of claim 9, wherein in step 4.1), the calibration of the magnetic field signal is performed in advance by combining with other magnetic field instruments, and the calibrated data curve is used for data correction between the standard voltage analog signal or the standard current analog signal collected by the ADC collecting module and the actual magnetic field value of the magnet.
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