CN110536536B - Restarting automatic exercise device for low-level system of cyclotron and control method - Google Patents
Restarting automatic exercise device for low-level system of cyclotron and control method Download PDFInfo
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- CN110536536B CN110536536B CN201910828214.0A CN201910828214A CN110536536B CN 110536536 B CN110536536 B CN 110536536B CN 201910828214 A CN201910828214 A CN 201910828214A CN 110536536 B CN110536536 B CN 110536536B
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- H—ELECTRICITY
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Abstract
The invention discloses a restarting automatic exercise device for a low-level system of a cyclotron, which comprises a cavity sampling signal unit, a wave detector unit, an ADC (analog-to-digital converter) sampling unit, an FFT (fast Fourier transform) conversion and data zeroing and data processing unit, a comparison unit, a control output signal unit, a cavity ignition detection unit, a cavity sampling signal processing unit and a motor control unit, wherein the cavity sampling signal unit is connected with the wave detector unit; the automatic exercise device obtains and processes a sampling signal from the accelerator cavity, and then outputs a signal to the transmitter and the motor controller; the intelligent control method comprises the following steps:
setting threshold parameters under different modes;
entering a low power automatic continuous exercise mode;
entering a medium power automatic pulse exercise mode;
entering a medium power automatic continuous exercise mode; the invention realizes the full automation of the restarting exercise stage of the cyclotron, effectively simplifies some complex processes needing manual judgment in the running process of the cyclotron, and improves the running efficiency in the low-level running process.
Description
Technical Field
The invention relates to the technical field of cyclotrons, in particular to a low-level system restart automatic exercise device of a cyclotrons and a control method.
Background
The cyclotron is widely applied to the fields of basic research of atomic nucleus, nuclear engineering, chemistry, radiobiology, radiology, solid physics and the like, diagnosis and treatment of diseases, activation analysis of high-purity substances, radiation treatment of certain industrial products, radiation treatment of agricultural products and other foods, cosmic radiation simulation, nuclear explosion simulation and the like.
When we need to make a commercial cyclotron for delivery to customers, the internal surface of the cavity of the cyclotron (which is a device for establishing voltage) may be contaminated during the previous processing, transportation, other long-time contact with the atmosphere, or after the cyclotron is stopped for a long time, and the contamination may cause the high-level signal of the low-level system to be reflected when fed into the cavity through the transmitter during operation, and may cause the equipment to be damaged when reflected to the equipment. Therefore, before the cyclotron runs, the cyclotron cavity needs to be exercised, and the exercise is completed by continuously transmitting signals to the transmitter, continuously amplifying the signals by the transmitter, continuously establishing a high-voltage electric field in the cavity, continuously removing the polluted inner surface of the cavity by the high-voltage electric field, and finally completely removing all pollution. This exercise process can be very long, with 1 month, 2 months, 3 months, 4 months, or even half a year.
The accelerator in the prior art is divided into two stages in the using process: an exercise phase and a run phase after completion of the exercise. The running stage is automatically controlled by a low-level system, but the exercise stage completely adopts a manual exercise method: the manual exercise method is that the signal transmitting knob is rotated manually, and the oscilloscope exercise result is seen at the same time. Because the accelerator requires 24 hours of uninterrupted exercise, three shifts are required to be started by adopting a manual exercise method, each shift generally requires 2 persons and 6 persons all day long, if the exercise time is half a year, a large amount of manpower is consumed, and the labor is consumed only when 1 cyclotron is paid for use, and if dozens of or hundreds of cyclotrons are delivered for use, huge manpower cost is required, and the popularization and the use of the cyclotrons are seriously influenced due to overhigh manpower cost.
Disclosure of Invention
The invention provides a restarting automatic exercise device for a low-level system of a cyclotron and a control method for solving the problems in the prior art, and aims to solve the problem that the popularization and the use of the cyclotron are seriously influenced due to overhigh labor cost caused by adopting a manual exercise method in the exercise process of the cyclotron in the prior art.
The invention adopts the following technical scheme for solving the technical problems:
a restarting automatic exercise device of a low-level system of a cyclotron is characterized in that: the device comprises a cavity sampling signal unit, a detector unit, an ADC (analog to digital converter) sampling unit, an FFT (fast Fourier transform) conversion and data zeroing and data processing unit, a comparison unit, a control output signal unit, a cavity ignition detection unit, a cavity sampling signal processing unit and a motor control unit; the cavity sampling signal unit obtains a cavity sampling signal from an accelerator cavity of a cyclotron low-level operation system, and then the cavity sampling signal is sent to the FFT conversion and data zeroing and data processing unit through the wave detector and the ADC sampling unit; the FFT conversion and data zeroing and data processing unit sends a processing result to the comparison unit, and the comparison unit sends the comparison result to the control output signal unit; the input end of the control output signal unit receives signals from the comparison unit and the cavity ignition detection unit respectively, and the output end of the control output signal unit sends the signals to a transmitter of a cyclotron low-level operation system; the input end of the cavity sampling signal processing unit obtains a cavity sampling signal from the cavity sampling signal unit and processes the cavity sampling signal, and then outputs a processing result to the motor control unit; the motor control unit outputs a signal to the cyclotron low level to restart the motor drive of the automatic exercise system.
An intelligent control method for restarting an automatic exercise device of a low-level system of a cyclotron is used for carrying out self-starting exercise and running of the system when restarting the low-level system of the cyclotron every time or when restarting the system after a long time of shutdown; the method is characterized in that: the method comprises the following steps:
step one, entering an automatic exercise mode of restarting a low-level system of a cyclotron;
step two, entering an automatic running mode of restarting a low-level system of the cyclotron;
the specific process of the step one is as follows:
⑴ setting threshold parameters in different modes;
⑵ enter a low power automatic continuous exercise mode;
⑶ enter a medium power automatic pulse exercise mode;
⑷ enter a medium power automatic continuous exercise mode;
the threshold parameters in the different modes include a low power continuous exercise mode threshold parameter, a medium power pulse exercise mode threshold parameter, and a medium power continuous exercise mode threshold parameter.
Moreover, the process ⑵ enters a low power continuous exercise mode, which includes the following steps:
⑴ inputting a low power continuous wave signal;
⑵ real-time low power searching of the cavity by the motor;
⑶ detecting, sampling, sorting, and finding the maximum value;
⑷ judging whether the maximum sampling value is greater than or equal to the low-power exercise threshold, if so, switching to the next medium-power pulse exercise mode, and if less than the low-power exercise threshold, returning to step ⑴ to continue the low-power automatic continuous exercise mode;
moreover, the process ⑶ enters a medium power pulse exercise mode, which includes the following steps:
⑴ inputting a pulse signal with medium power;
⑵ analog signal processing is carried out on the sampling signal of the cavity;
⑶ digitizing the analog signal;
⑷ sorting and zeroing the digitalized result;
⑸ Fourier transforming the processed result;
⑹ judging the broadening of the current pulse according to the Fourier judgment result, whether the broadening of the current pulse is less than or equal to the threshold parameter of the medium power pulse exercise mode, if the broadening of the current pulse is less than or equal to the threshold of the medium power pulse exercise mode, entering the next medium power continuous exercise mode, if the broadening of the current pulse is greater than the threshold of the medium power pulse exercise mode, returning to the process ⑴, and continuing the medium power automatic pulse exercise mode.
Moreover, the process ⑷ enters a medium power continuous exercise mode, which includes the following steps:
⑴ inputting a continuous wave signal of medium power;
⑵ tune and provide spark protection in real time;
⑶ detecting, sampling, sorting, and finding the maximum value;
⑷ judging whether the maximum cavity sampling value is larger than or equal to the medium power continuous exercise threshold, if yes, ending the automatic exercise mode of the cyclotron low level system, and switching to the automatic running mode of the cyclotron low level system, if not, returning to the link ⑴, and continuing to perform the medium power continuous exercise mode.
Furthermore, the broadening of the current pulse of the link ⑹ is the broadening of the pulse at a point on the post-FFT pulse sequence X [ K ] where K is (2pi/Tr)/(2pi/NTp), where X represents the post-FFT pulse sequence, X [ K ] represents the value of each point of the post-FFT frequency domain sequence, K represents each point on the post-FFT frequency domain sequence, Tr represents the pulse width in the time domain before FFT, Tp represents the time domain sampling period before FFT, and N represents the number of points of the time domain sampling before FFT.
Advantageous effects of the invention
1. The cavity sampling signal unit receives a sampling signal from the cavity of the accelerator, the sampling signal is subjected to wave detection, ADC sampling, data processing and data zeroing, FFT conversion and threshold comparison, the motor driver is controlled by the cavity sampling signal processing unit, signals of the cavity ignition detection device and the threshold comparison unit are simultaneously received and processed by the control output signal unit, and a processing result is output to the transmitter, so that the full automation of the restarting exercise stage of the cyclotron is realized, complex processes needing manual judgment in the running process of the cyclotron are effectively simplified, and the running efficiency in the low-level running process is improved.
2. The invention solves three difficult problems of safety, rapidness and stability in the realization of full-automatic exercise of the cyclotron in the field for a long time, and satisfactorily solves the three problems by setting three stages of low-power continuous exercise, medium-power pulse exercise and medium-power continuous exercise: the low-power continuous exercise mode meets the requirements of low starting at the initial exercise stage and quick starting; the medium-power pulse exercise mode meets the requirement of accelerating the speed in the middle exercise period and also meets the safety requirement caused by high speed; the medium-power continuous exercise mode meets the requirements of stability in the later period of exercise and rapidity on the basis of the stability, and the three exercise modes are organically combined to realize the ingenious combination of scientificity and safety.
3. The invention skillfully utilizes the method of comparing the Fourier transform and the point value to be measured with the set point threshold value in the medium-power pulse exercise stage, solves the difficult problem that the exercise effect is difficult to confirm due to unstable pulse feedback signals in the medium-power pulse exercise mode, and further solves the difficult problem of measuring the pulse width in the medium-power pulse exercise mode by the method of comparing the Fourier transform and the point value to be measured with the set point threshold value, thereby realizing the aim of comparing the set pulse width with the actual pulse width and determining whether the current exercise is successful.
Drawings
FIG. 1a is a block diagram of the low level system restart automatic exercise device of the cyclotron of the present invention;
FIG. 1b is a diagram of the operating mode of a cyclotron low level system;
FIG. 2 is a flow chart of the intelligent control method of restarting the automatic exercise device based on the cyclotron low level system of the present invention;
FIG. 3 is a flow chart of the present invention for restarting the automatic exercise mode of the cyclotron low level system;
FIG. 4 is a flow chart of the low power continuous exercise mode of the present invention;
FIG. 5 is a flow chart of a medium power pulse exercise mode of the present invention;
FIG. 6 is a flow chart of the present invention for a medium power continuous exercise mode;
FIGS. 7a and 7b are corresponding graphs of Fourier transform time domain and frequency domain;
FIG. 8a is a diagram showing the correspondence between the time domain and the frequency domain of Fourier transform in an ideal state when the exercise is completed;
FIG. 8b is a diagram showing the correspondence between the time domain and the frequency domain of Fourier transform in a non-ideal state before exercise;
fig. 8c and 8d are exploded views of fig. 8 b.
Detailed Description
The invention is further explained below with reference to the drawings:
design principle of the invention
1. Low power continuous exercise mode design principle: the multi-point effect region with lower voltage needs to be crossed in the initial stage of the accelerator cavity exercise, and if the multi-point effect region with lower voltage cannot be crossed, the power is not increased upwards. Since the low power is applied to the accelerator cavity in the low power stage so that the reflection due to the multiple electron effect is small and does not cause damage to the device, the method of continuously transmitting waves can be adopted in the low power stage.
2. Medium power pulse exercise mode design principle: when a plurality of areas generating multiple electron effects are generated in a low-power stage, a higher-intensity medium pulse power is needed to exercise, and because the intensity of a medium-power signal is higher than that of a low-power signal, in order to prevent the device from being frequently switched and damaged due to protection caused by excessive reflection, a pulse mode rather than a continuous transmission mode is needed, wherein the pulse mode is a transmission mode with an interval of one second or a certain time.
The medium power pulse exercise method is summarized as that the intensity and the width of the pulse are increased continuously according to the judgment of a feedback signal, so that the crossing of the multiple electronic effect in a medium power area is realized. The medium power pulse exercise phase goals are: and the pulse width of the point to be measured is automatically identified or monitored in the pulse exercise stage. The previous low power continuous monitoring is easier to implement than the medium power exercise mode because the signal is a continuous wave, the sampled data is detected and sequenced, and compared with a threshold value, it is known whether to increase the power or continue exercising at the original power. After the medium power pulse exercise is entered, because the pulse feedback signal is very unstable and random, it cannot be simply determined from the time domain whether the exercise is successful currently, and therefore a method needs to be found for automatically determining whether the exercise is currently good or not.
The invention adopts a method of fast Fourier transform and a set point threshold value, wherein the set point is a certain point on the abscissa of a frequency domain function coordinate obtained through calculation and is called as the set point. The setpoint threshold is the value of the ordinate corresponding to the setpoint. After the set point is found, when the data to be tested is subjected to fast Fourier transform, the result value of the frequency point with the abscissa of the result being the same as the set point is compared with the set point threshold, if the value of the point to be tested is larger than the set point threshold, the user does not exercise, the user needs to continue pulse exercise, if the value of the point to be tested is smaller than the set point threshold, the user needs to go to the next link.
The principle of comparing the value of the point to be measured with the set point threshold value to judge whether the exercise is successful is as follows: the criterion for exercise success is that the given pulse width and the actual pulse width are consistent. When impurities exist in the cavity, the latter half part signal of the pulse is often reflected back, so that the width of the actual pulse is smaller than that of the given pulse when the impurities exist in the cavity, when the actual pulse width does not reach the given pulse width, because the frequency spectrum component of the narrow pulse is more than that of the wide pulse, the distance from the peak of the frequency spectrum to the zero point (the set point threshold value is 0) of the narrow pulse of the point to be measured to the zero point is longer than that of the wide pulse, namely the distance from the coordinate point on the X axis to the origin point when the narrow pulse reaches the zero point from the peak of the frequency spectrum is farther. Therefore, in the same time frame, the ordinate value of the narrow pulse spectrum when it reaches the set point is larger than the set point threshold value. The narrow pulse width can not reach the given width, so that the current exercise effect is judged to be not good enough, and the exercise needs to be continued, wherein the exercise continuing method is a method of continuously giving a medium-power pulse signal to the transmitter through a low-level system, amplifying the signal by the transmitter and feeding the amplified signal into the accelerator cavity, establishing a high-voltage electric field in the accelerator cavity, and removing impurities in the cavity through the high-voltage electric field.
3. Medium power continuous exercise mode design principle. The third stage uses a medium power continuous wave because it needs to consolidate the exercise results after the pulse phase has passed, which requires the functions of providing spark protection and tuning the cavity. More electrons with multiple electron effects can be knocked down by adopting a continuous exercise mode than by adopting a pulse mode. Continuous wave exercise can be employed in the third stage because the impurities in the accelerator cavity have been substantially removed in the second stage, without concern for the device being frequently switched and damaged due to excessive reflections caused by the presence of the cavity impurities.
The third stage and the first stage, although the intensity of the transmitted power is different, adopt the method of continuous wave transmitted signal training, and have other differences: the first stage uses the motor to reciprocate in a wide range to perform the exercise, but the motor cannot reciprocate in a wide range to reach the third stage because the middle power intensity of the third stage is larger than the low power intensity of the first stage, so the reflected power of the third stage is large if the motor reciprocates in a wide range, and the third stage needs the motor to reciprocate in a certain tuning range.
4. The present invention relates to an automatic exercise device and a low level operating system. The cyclotron low level system restart automatic exercise device of figure 1a is a part of the low level system of figure 1b, but not all of the low level system of figure 1b, and figure 1a shows the wiring relationship of the present invention to the accelerator chamber, transmitter, motor drive of figure 1 b.
As shown in fig. 1b, the structure of the low level system operation mode of the cyclotron: the system comprises a low level system, a transmitter, an accelerator cavity, a cavity fine tuning motor and a motor driver, wherein the cavity fine tuning motor and the motor driver are arranged in the cavity; the restarting automatic exercise device of the low-level system comprises a control output signal unit, wherein the control output signal unit sends a high-frequency signal to a transmitter, and the transmitter amplifies a signal given by the low-level system and feeds an output high-power signal into an accelerator cavity; the accelerator cavity can establish a high-voltage electric field to accelerate particles through the power fed in by the transmitter; the low-level system can also receive a sampling signal fed back from the accelerator cavity, and simultaneously output a motor control signal to the motor driver, and the motor driver controls the cavity to finely adjust the motor, so that the stability of the cavity frequency is ensured;
the low level system further comprises an operating mode determining unit which determines whether the system is currently in an exercise mode or an operational mode, the operating mode determining unit belonging to the low level system but being located outside the re-activated automatic exercise device of the low level system, being another part of the low level system.
Based on the principle of the invention, the invention designs the restarting automatic exercise device of the low-level system of the cyclotron.
A restarting automatic exercise device of a cyclotron low-level system is shown in figure 1 and comprises a cavity sampling signal unit, a wave detector unit, an ADC (analog-to-digital converter) sampling unit, an FFT (fast Fourier transform) conversion and data zeroing and data processing unit, a comparison unit, a control output signal unit, a cavity ignition detection unit, a cavity sampling signal processing unit and a motor control unit; the cavity sampling signal unit obtains a cavity sampling signal from an accelerator cavity of a cyclotron low-level operation system, and then the cavity sampling signal is sent to the FFT conversion and data zeroing and data processing unit through the wave detector and the ADC sampling unit; the FFT conversion and data zeroing and data processing unit sends a processing result to the comparison unit, and the comparison unit sends the comparison result to the control output signal unit; the input end of the control output signal unit receives signals from the comparison unit and the cavity ignition detection unit respectively, and the output end of the control output signal unit sends the signals to a transmitter of a cyclotron low-level operation system; the input end of the cavity sampling signal processing unit obtains a cavity sampling signal from the cavity sampling signal unit and processes the cavity sampling signal, and then outputs a processing result to the motor control unit; the motor control unit outputs a signal to the cyclotron low level to restart the motor drive of the automatic exercise system.
Supplementary explanation:
1. the cavity sampling signal processing unit: the unit mainly adopts the relative phase relation of an analysis signal and a reference signal, and adjusts the position of the motor according to the result to form a closed loop, thereby ensuring the tuning state of the cavity.
2. The position and the effect of the cavity fine tuning motor are as follows: the cavity vernier motor and the accelerator cavity in fig. 1b belong to a whole from function division, but the cavity vernier motor is not installed inside the accelerator cavity but installed outside the accelerator cavity and next to the accelerator cavity, and the accelerator cavity is sealed.
The cavity trimming motor actually carries the trimming capacitor of the cavity to sweep frequency, or the cavity trimming motor carries the trimming structure of the cavity to sweep frequency. The cavity has a natural frequency, the natural frequency of the cavity changes when the mechanical structure of the cavity changes, a device for finely adjusting the frequency is arranged when the cavity is designed, and the frequency of the device changes as long as the device moves, so that fine adjustment is carried out. The cavity trimming motor is used for tuning the frequency of the cavity when the power is high: since the temperature of the cavity rises when power is supplied to the cavity and the natural frequency of the cavity changes when the temperature rises, fine adjustment of the power by the motor is ensured and the frequency of the cavity is adjusted to a desired frequency.
The invention also designs an intelligent control method for restarting the automatic exercise device based on the low-level system of the cyclotron, which is used for carrying out the self-starting exercise and running of the system when restarting the low-level system of the cyclotron every time or when restarting the system after long shutdown time;
as shown in fig. 2, the method comprises the steps of:
step one, entering an automatic exercise mode of restarting a low-level system of a cyclotron;
step two, entering an automatic running mode of restarting a low-level system of the cyclotron;
as shown in fig. 3, the specific process of the first step is as follows:
⑴ setting threshold parameters in different modes;
⑵ enter a low power automatic continuous exercise mode;
⑶ enter a medium power automatic pulse exercise mode;
⑷ enter a medium power automatic continuous exercise mode;
the threshold parameters in the different modes include a low power continuous exercise mode threshold parameter, a medium power pulse exercise mode threshold parameter, and a medium power continuous exercise mode threshold parameter.
As shown in fig. 4, the process ⑵ enters a low power continuous exercise mode, which includes the following steps:
⑴ inputting a low power continuous wave signal;
⑵ real-time low power searching of the cavity by the motor;
⑶ detecting, sampling, sorting, and finding the maximum value;
⑷ judging whether the maximum sampling value is greater than or equal to the low-power exercise threshold, if so, switching to the next medium-power pulse exercise mode, and if less than the low-power exercise threshold, returning to step ⑴ to continue the low-power automatic continuous exercise mode;
as shown in fig. 5, the process ⑶ enters a medium power pulse exercise mode, which includes the following steps:
⑴ inputting a pulse signal with medium power;
⑵ analog signal processing is carried out on the sampling signal of the cavity;
⑶ digitizing the analog signal;
⑷ sorting and zeroing the digitalized result;
supplementary explanation:
the step of sorting the digitalized result is as follows: the digitized detection result is subjected to averaging and sorting, and the offset value when the output is 0 is subtracted from all data, so that the digitized result is called to be sorted.
The zeroing of the digitization result is as follows: and setting the default of the detection result data after the digitization is less than a certain range as zero, namely, zeroing the digitization result.
⑸ Fourier transforming the processed result;
⑹ judging the broadening of the current pulse according to the Fourier judgment result, whether the broadening of the current pulse is less than or equal to the threshold parameter of the medium power pulse exercise mode, if the broadening of the current pulse is less than or equal to the threshold of the medium power pulse exercise mode, entering the next medium power continuous exercise mode, if the broadening of the current pulse is greater than the threshold of the medium power pulse exercise mode, returning to the process ⑴, and continuing the medium power automatic pulse exercise mode.
Supplementary explanation:
fig. 7a and 7b are schematic diagrams of a method for measuring the pulse width by using a fourier transform method. Fig. 7a is a time domain diagram before fourier transform, and fig. 7b is a frequency domain diagram after fourier transform. Point B represents the width Tr of the pulse emitted in the medium power pulse exercise mode, point a is a set value representing the ideal width to be achieved by the pulse after fourier transform, and point a is (2pi/Tr)/(2pi/NTp) where Tp is the sampling period and N is the number of time-domain sampling points. If the ordinate value of the curve of the point to be measured of the frequency domain at the point A is smaller than the threshold value of the point A, the pulse width reaches the given width, and if the ordinate value of the curve of the point to be measured of the frequency domain at the point A is larger than the threshold value of the point A, the pulse width does not reach the given width. As described in the inventive concept: this is because the narrow pulse has more spectral components than the wide pulse, and therefore the distance from the peak of the spectrum to the zero point (the set point threshold is 0) of the narrow pulse of the point to be measured to the zero point is longer than that of the wide pulse, that is, the distance from the coordinate point on the X axis to the origin point when the narrow pulse reaches the zero point from the peak of the spectrum is longer, thereby determining whether the width of the pulse reaches a given width.
As shown in fig. 8a, which is a schematic diagram of the actual pulse width reaching a given width after fourier transform, it can be seen from the frequency domain diagram on the right side that the curve value of the point to be measured at a point a is equal to the threshold value of a, and the threshold value of the point a is 0.
As shown in fig. 8b, which is a schematic diagram of the actual pulse width after fourier transform does not reach the given width, it can be seen from the frequency domain diagram on the right side that the curve value of the point to be measured at a is far greater than the threshold value of a, which indicates that the pulse of the point to be measured is a narrow pulse and is smaller than the width of the given pulse.
FIG. 8c and FIG. 8d are the component diagrams of FIG. 8b, and the pulse of FIG. 8c is a narrower pulse than that of FIG. 8d, so the value of A at the point to be measured of FIG. 8c is greater than the threshold value 0 of A, and the pulse width of FIG. 8d is equal to a given width, so the value of A at the point to be measured of FIG. 8d is equal to the threshold value 0 of A.
As shown in fig. 6, the process ⑷ enters a medium power continuous exercise mode, which includes the following steps:
⑴ inputting a continuous wave signal of medium power;
⑵ tune and provide spark protection in real time;
⑶ detecting, sampling, sorting, and finding the maximum value;
⑷ judging whether the maximum cavity sampling value is larger than or equal to the medium power continuous exercise threshold, if yes, ending the automatic exercise mode of the cyclotron low level system, and switching to the automatic running mode of the cyclotron low level system, if not, returning to the link ⑴, and continuing to perform the medium power continuous exercise mode.
The broadening of the current pulse of the link ⑹ is the broadening of a pulse at a point on a post-FFT pulse sequence X [ K ] that satisfies K ═ 2pi/Tr)/(2pi/NTp), where X represents the post-FFT pulse sequence, X [ K ] represents the value of each point of the post-FFT frequency domain sequence, K represents each point on the post-FFT frequency domain sequence, Tr represents the pulse width in the time domain before FFT, Tp represents the time domain sampling period before FFT, and N represents the number of time domain samples before FFT.
It should be emphasized that the described embodiments of the present invention are illustrative rather than limiting and, thus, the present invention includes embodiments that are not limited to those described in the detailed description.
Claims (6)
1. A low level system restart automatic exercise device of cyclotron, characterized in that: the device comprises a cavity sampling signal unit, a detector unit, an ADC (analog to digital converter) sampling unit, an FFT (fast Fourier transform) conversion and data zeroing and data processing unit, a comparison unit, a control output signal unit, a cavity ignition detection unit, a cavity sampling signal processing unit and a motor control unit; the cavity sampling signal unit obtains a cavity sampling signal from an accelerator cavity of a cyclotron low-level operation system, and then the cavity sampling signal is sent to the FFT conversion and data zeroing and data processing unit through the wave detector and the ADC sampling unit; the FFT conversion and data zeroing and data processing unit sends a processing result to the comparison unit, and the comparison unit sends the comparison result to the control output signal unit; the input end of the control output signal unit receives signals from the comparison unit and the cavity ignition detection unit respectively, and the output end of the control output signal unit sends the signals to a transmitter of a cyclotron low-level operation system; the input end of the cavity sampling signal processing unit obtains a cavity sampling signal from the cavity sampling signal unit and processes the cavity sampling signal, and then outputs a processing result to the motor control unit; the motor control unit outputs a signal to the cyclotron low level to restart the motor drive of the automatic exercise system.
2. An intelligent control method based on the automatic exercise device restarted by the low-level system of the cyclotron in claim 1, wherein the method is used for carrying out the self-starting exercise and running of the system each time the low-level system of the cyclotron is restarted or the system is restarted after a long time of shutdown; the method is characterized in that: the method comprises the following steps:
step one, entering an automatic exercise mode of restarting a low-level system of a cyclotron;
step two, entering an automatic running mode of restarting a low-level system of the cyclotron;
the specific process of the step one is as follows:
⑴ setting threshold parameters in different modes;
⑵ enter a low power automatic continuous exercise mode;
⑶ enter a medium power automatic pulse exercise mode;
⑷ enter a medium power automatic continuous exercise mode;
the threshold parameters in the different modes include a low power continuous exercise mode threshold parameter, a medium power pulse exercise mode threshold parameter, and a medium power continuous exercise mode threshold parameter.
3. The intelligent control method for restarting the automatic exercise device of the cyclotron low-level system of claim 2, wherein the process ⑵ enters a low-power continuous exercise mode, comprising the following steps:
⑴ inputting a low power continuous wave signal;
⑵ real-time low power searching of the cavity by the motor;
⑶ detecting, sampling, sorting, and finding the maximum value;
⑷, determining whether the maximum sampling value is greater than or equal to the low power exercise threshold, if so, switching to the next medium power pulse exercise mode, and if less than the low power exercise threshold, returning to element ⑴, and continuing the low power automatic continuous exercise mode.
4. The intelligent control method of a cyclotron low-level system restart automatic exercise device as claimed in claim 2, wherein said process ⑶ enters a medium power pulse exercise mode, specifically comprising the following steps:
⑴ inputting a pulse signal with medium power;
⑵ analog signal processing is carried out on the sampling signal of the cavity;
⑶ digitizing the analog signal;
⑷ sorting and zeroing the digitalized result;
⑸ Fourier transforming the processed result;
⑹ judging the broadening of the current pulse according to the Fourier judgment result, whether the broadening of the current pulse is less than or equal to the threshold parameter of the medium power pulse exercise mode, if the broadening of the current pulse is less than or equal to the threshold of the medium power pulse exercise mode, entering the next medium power continuous exercise mode, if the broadening of the current pulse is greater than the threshold of the medium power pulse exercise mode, returning to the process ⑴, and continuing the medium power automatic pulse exercise mode.
5. The intelligent control method for restarting the automatic exercise device of the cyclotron low-level system of claim 2, wherein the process ⑷ enters a continuous exercise mode with medium power, comprising the following steps:
⑴ inputting a continuous wave signal of medium power;
⑵ tune and provide spark protection in real time;
⑶ detecting, sampling, sorting, and finding the maximum value;
⑷ judging whether the maximum cavity sampling value is larger than or equal to the medium power continuous exercise threshold, if yes, ending the automatic exercise mode of the cyclotron low level system, and switching to the automatic running mode of the cyclotron low level system, if not, returning to the link ⑴, and continuing to perform the medium power continuous exercise mode.
6. The intelligent control method for the restarting automatic exercise device of the cyclotron low-level system according to claim 4 is characterized in that the broadening of the current pulse of the link ⑹ is the broadening of the pulse of the point satisfying K ═ 2pi/Tr)/(2pi/NTp) on a pulse sequence X [ K ] after FFT, wherein X represents the pulse sequence after FFT, X [ K ] represents the value of each point of the frequency domain sequence after FFT, K represents each point on the frequency domain sequence after FFT, Tr represents the pulse width in the time domain before FFT, Tp represents the time domain sampling period before FFT, and N represents the number of the time domain samples before FFT.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498444B1 (en) * | 2000-04-10 | 2002-12-24 | Siemens Medical Solutions Usa, Inc. | Computer-aided tuning of charged particle accelerators |
| CN1891864A (en) * | 2005-07-08 | 2007-01-10 | 北京大学 | Dry treatment method for superconductor cavity |
| CN102869185A (en) * | 2012-09-12 | 2013-01-09 | 中国原子能科学研究院 | Cavity exercising method of high-current compact type editcyclotron |
| CN103079334A (en) * | 2013-01-04 | 2013-05-01 | 中国原子能科学研究院 | Automatic exercising system of radio frequency resonant cavity of circular accelerator |
| CN103179773A (en) * | 2013-02-07 | 2013-06-26 | 中国科学院上海应用物理研究所 | Automatic high-voltage forging method of high-voltage accelerator and automatic high-voltage forging system of high-voltage accelerator |
| CN105282956A (en) * | 2015-10-09 | 2016-01-27 | 中国原子能科学研究院 | Intelligent self-starting method for high-frequency system of strong-current circular accelerator |
-
2019
- 2019-09-03 CN CN201910828214.0A patent/CN110536536B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6498444B1 (en) * | 2000-04-10 | 2002-12-24 | Siemens Medical Solutions Usa, Inc. | Computer-aided tuning of charged particle accelerators |
| CN1891864A (en) * | 2005-07-08 | 2007-01-10 | 北京大学 | Dry treatment method for superconductor cavity |
| CN102869185A (en) * | 2012-09-12 | 2013-01-09 | 中国原子能科学研究院 | Cavity exercising method of high-current compact type editcyclotron |
| CN103079334A (en) * | 2013-01-04 | 2013-05-01 | 中国原子能科学研究院 | Automatic exercising system of radio frequency resonant cavity of circular accelerator |
| CN103179773A (en) * | 2013-02-07 | 2013-06-26 | 中国科学院上海应用物理研究所 | Automatic high-voltage forging method of high-voltage accelerator and automatic high-voltage forging system of high-voltage accelerator |
| CN105282956A (en) * | 2015-10-09 | 2016-01-27 | 中国原子能科学研究院 | Intelligent self-starting method for high-frequency system of strong-current circular accelerator |
Non-Patent Citations (1)
| Title |
|---|
| CYCIAE-100回旋加速器高频谐振腔的老炼;殷治国等;《中国原子能科学研究院年报》;20131231;全文 * |
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