CN110261886A - Utilize the method and system of digital BPM measurement linear accelerator beam position - Google Patents
Utilize the method and system of digital BPM measurement linear accelerator beam position Download PDFInfo
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Abstract
This application discloses a kind of method and system using number BPM measurement linear accelerator beam position；Line trigger signal and four road straight line beam current signals are obtained, according to line trigger signal, windowing interception is carried out to four road straight line beam current signals respectively, obtains four the first digital signals of tunnel；Splicing recombination is carried out to four the first digital signals of tunnel, obtains four the second digital signals of tunnel, wherein the second digital signal is obtained by the first digital signal of duplication；Interpolation processing is carried out to four the second digital signals of tunnel, obtains four tunnel third digital signals；Four tunnel third digital signals are filtered, the 4th digital signal of four tunnels is obtained；According to the 4th digital signal of four tunnels, beam position data are obtained, the resolution ratio of beam position data can satisfy accelerator measurement demand.
Description
Technical field
The present invention relates generally to high-energy physics fields, and in particular to particle accelerator field more particularly to it is a kind of utilize number
The method and system of word BPM measurement linear accelerator beam position.
Background technique
In particle accelerator field, digital BPM (Beam Position Monitor, beam position detector) be into
The key equipment of row beam position measurement.Its system hardware is set for the purpose of completing high-resolution beam position measurement
Meter, hardware configuration specifically include that digital BPM probe, coaxial transmission cable, radio frequency conditioning circuit and digital processing circuit etc..It is soft
FPGA (Field Programmable Gate Array, field programmable gate array) of the part algorithm in digital processing circuit
It is realized in chip, the computer language used is HDL (Hardware Description Language, hardware description language)
Language.
Currently, straight line BPM electronics used in linear accelerator is provided by a French commercial company, straight line
BPM algorithm be to user it is completely enclosed, also can not find the specific mentality of designing of its algorithm in the document published.
Summary of the invention
It is intended to provide a kind of side using number BPM measurement linear accelerator beam position that can satisfy Measurement Resolution
Method and system.
In a first aspect, the method using number BPM measurement linear accelerator beam position of the invention, including following step
It is rapid:
Obtain line trigger signal and four road straight line beam current signals；
According to line trigger signal, windowing interception is carried out to four road straight line beam current signals respectively, obtains four the first numbers of tunnel
Signal；
Splicing recombination is carried out to four the first digital signals of tunnel, obtains four the second digital signals of tunnel, wherein the second digital signal
It is obtained by the first digital signal of duplication；
Interpolation processing is carried out to four the second digital signals of tunnel, obtains four tunnel third digital signals；
Four tunnel third digital signals are filtered, the 4th digital signal of four tunnels is obtained；
According to the 4th digital signal of four tunnels, beam position data are obtained.
Second aspect, the system using number BPM measurement linear accelerator beam position of the invention, comprising:
Signal acquisition module: for obtaining line trigger signal and four road straight line beam current signals；
Open a window interception module: for carrying out windowing interception to four road straight line beam current signals respectively according to line trigger signal,
Obtain four the first digital signals of tunnel；
Splicing module: for carrying out splicing recombination to four the first digital signals of tunnel, obtaining four the second digital signals of tunnel,
In, the second digital signal is obtained by the first digital signal of duplication；
Interpolating module: for carrying out interpolation processing to four the second digital signals of tunnel, four tunnel third digital signals are obtained；
Filter module: for being filtered to four tunnel third digital signals, the 4th digital signal of four tunnels is obtained；
Processing module: for obtaining beam position data according to the 4th digital signal of four tunnels.
According to technical solution provided by the embodiments of the present application, in conjunction with line trigger signal, four road straight line lines are believed respectively
Windowing interception number is carried out, four the first digital signals of tunnel are obtained, splicing recombination is carried out respectively, at interpolation to four the first digital signals of tunnel
Reason, filtering processing, are then calculated again, to obtain the beam position data for meeting accelerator measurement demand.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is that the process of the method for measuring linear accelerator beam position using number BPM of the embodiment of the present invention is shown
It is intended to；
Fig. 2 is that the structure of the system for measuring linear accelerator beam position using number BPM of the embodiment of the present invention is shown
It is intended to；
Fig. 3 is that the structure of the system for measuring linear accelerator beam position using number BPM of the embodiment of the present invention is shown
It is intended to；
Fig. 4 is that the structure of the system for measuring linear accelerator beam position using number BPM of the embodiment of the present invention is shown
It is intended to；
Fig. 5 is that the system for measuring linear accelerator beam position using number BPM of the embodiment of the present invention is measured
As a result schematic diagram；
Fig. 6 is that the system for measuring linear accelerator beam position using number BPM of the embodiment of the present invention is measured
As a result schematic diagram.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, part relevant to invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
One of embodiment of the invention is, referring to FIG. 1, of the invention measures linear accelerator using number BPM
The method of beam position, comprising the following steps:
Obtain line trigger signal and four road straight line beam current signals；
According to line trigger signal, windowing interception is carried out to four road straight line beam current signals respectively, obtains four the first numbers of tunnel
Signal；
Splicing recombination is carried out to four the first digital signals of tunnel, obtains four the second digital signals of tunnel, wherein the second digital signal
It is obtained by the first digital signal of duplication；
Interpolation processing is carried out to four the second digital signals of tunnel, obtains four tunnel third digital signals；
Four tunnel third digital signals are filtered, the 4th digital signal of four tunnels is obtained；
According to the 4th digital signal of four tunnels, beam position data are obtained.
In an embodiment of the present invention, the measurement of linear accelerator beam position needs accelerator to provide to straight line number BPM
Two signals: straight line beam current signal and line trigger signal.Electron gun is sent out in the starting point of linear accelerator with the frequency of 50Hz
Radio beamlet group, when each electron beam group is by straight line number BPM, four electrodes of BPM probe can induce four tunnel amplitudes
Different analog signals is transmitted by four road coaxial cables, and radio frequency conditioning circuit handles four tunnel analog signals, specifically
, radio frequency conditioning circuit carries out bandpass filtering treatment, attenuation processing and enhanced processing to four tunnel analog signals respectively, completes straight
The stretching, extension of line beam current signal in the time domain.At the time of line trigger signal is for marking straight line beam current signal to arrive, two signals are protected
Certain phase relation is held, convenient that effective straight line beam current signal is captured in FPGA, line trigger signal is a pulse signal,
The phase relation of pulse width and line trigger signal and straight line beam current signal be it is adjustable, can be according to the line position in FPGA
It sets measurement logic and carries out flexible modulation.
The time that straight line beam current signal arrives is detected according to line trigger signal, is opened a window to four road straight line beam current signals
Interception obtains effective the first digital signal of four tunnels, can reduce the interference of invalid signals, improve the resolution ratio of measurement result.
Single straight line beam current signal duration is shorter, and the points for the first digital signal for causing windowing to intercept are less, by right
First digital signal carries out splicing recombination, and carrying out splicing recombination to the first digital signal is the first digital signal of duplication, can obtain
Obtain four more the second digital signals of tunnel of data point number.Then interpolation processing is carried out to the second digital signal, obtains third number
Signal, data after interpolation processing are closer to the amplitude variable condition of true line, that is, third digital signal can
The case where analogue signal amplitude variation sensed when more accurately reaction straight line beam current signal is popped one's head in by BPM.To third number
Word signal is filtered, by third digital signal by the duplicate letter of the introduced frequency of splicing and interpolation processing
The removal of number ingredient, obtains the 4th digital signal, then according to the 4th digital signal of four tunnels, obtains beam position data.Finally will
Beam position data upload by network and are stored in database, and the resolution ratio of beam position data can satisfy accelerator measurement and need
It asks.
Further, tetra- the second digital signal of tunnel of Dui carries out interpolation processing, before obtaining four tunnel third digital signals, also
Including carrying out reduction of speed processing to four the second digital signals of tunnel.
In an embodiment of the present invention, interpolation processing is carried out to the second digital signal, will lead to the number of third digital signal
It is got higher according to rate, the data rate of the third digital signal after several times of interpolation processings is possible to be more than what fpga chip was supported
Peak data rate.Before carrying out interpolation processing to the second digital signal, reduction of speed processing, energy first are carried out to the second digital signal
Enough ensure that the data rate of third digital signal is no more than the peak data rate that fpga chip is supported, improves the stabilization of measurement
Property.
Further, the reduction of speed multiple of the second digital signal and the interpolation multiple of the second digital signal are equal.
In an embodiment of the present invention, the interpolation multiple phase of the reduction of speed multiple of the second digital signal and the second digital signal
Deng can guarantee that the data rate of third digital signal is identical as the data rate of the second digital signal before reduction of speed, avoid
The data rate of three digital signals is more than the peak data rate that fpga chip is supported, improves the stability of measurement.
Further, four tunnel third digital signals are filtered, obtain the 4th digital signal of four tunnels, including, it goes
Except by the duplicate signal component of the introduced frequency of splicing and interpolation processing, obtaining four tunnels in four tunnel third digital signals
4th digital signal.
In an embodiment of the present invention, it removes introduced by splicing and interpolation processing in four tunnel third digital signals
The duplicate signal component of frequency, obtain the 4th digital signal of four tunnels, to improve the accuracy of measurement.
Further, according to the 4th digital signal of four tunnels, beam position data are obtained, including,
The absolute value of the 4th digital signal of four tunnels is integrated respectively, obtains the range value of four road straight line beam current signals,
Beam position data are obtained according to the range value of four road straight line beam current signals.
In an embodiment of the present invention, the absolute value of the 4th digital signal of four tunnels is integrated respectively, obtains four Lu Zhi
The range value of line beam current signal is respectively VA、VB、VC、VD, VAIndicate the straight line beam current signal by coaxial transmission cable A transmission
Amplitude, VBIndicate the amplitude of the straight line beam current signal by coaxial transmission cable B transmission, VCIt indicates to pass by coaxial transmission cable C
The amplitude of defeated straight line beam current signal, VDThe amplitude for indicating the straight line beam current signal by coaxial transmission cable D transmission, according to four
The range value and difference of road straight line beam current signal and than formula obtain beam position data (X, Y), wherein X=(VA-VC)/(VA+
VC), Y=(VB-VD)/(VB+VD)。
Another embodiment of the invention is, a kind of to measure linear accelerator line position using number BPM with reference to Fig. 2-6
The system set, comprising:
Signal acquisition module: for obtaining line trigger signal and four road straight line beam current signals；
Open a window interception module: for carrying out windowing interception to four road straight line beam current signals respectively according to line trigger signal,
Obtain four the first digital signals of tunnel；
Splicing module: for carrying out splicing recombination to four the first digital signals of tunnel, obtaining four the second digital signals of tunnel,
In, the second digital signal is obtained by the first digital signal of duplication；
Interpolating module: for carrying out interpolation processing to four the second digital signals of tunnel, four tunnel third digital signals are obtained；
Filter module: for being filtered to four tunnel third digital signals, the 4th digital signal of four tunnels is obtained；
Processing module: for obtaining beam position data according to the 4th digital signal of four tunnels.
In an embodiment of the present invention, the measurement of linear accelerator beam position needs accelerator to provide to straight line number BPM
Two signals: straight line beam current signal and line trigger signal.Electron gun is sent out in the starting point of linear accelerator with the frequency of 50Hz
Radio beamlet group, when each electron beam group is by straight line number BPM, four electrodes of BPM probe can induce four tunnel amplitudes
Different analog signals is transmitted by four road coaxial cables, and radio frequency conditioning circuit handles four tunnel analog signals, specifically
, radio frequency conditioning circuit carries out bandpass filtering treatment, attenuation processing and enhanced processing to four tunnel analog signals respectively, completes straight
The stretching, extension of line beam current signal in the time domain.At the time of line trigger signal is for marking straight line beam current signal to arrive, two signals are protected
Certain phase relation is held, convenient that effective straight line beam current signal is captured in FPGA, line trigger signal is a pulse signal,
The phase relation of pulse width and line trigger signal and straight line beam current signal be it is adjustable, can be according to the line position in FPGA
It sets measurement logic and carries out flexible modulation.
The time that straight line beam current signal arrives is detected according to line trigger signal, is opened a window to four road straight line beam current signals
Interception obtains effective the first digital signal of four tunnels, can reduce the interference of invalid signals, improve the resolution ratio of measurement result.
Single straight line beam current signal duration is shorter, and the points for the first digital signal for causing windowing to intercept are less, by right
First digital signal carries out splicing recombination, and carrying out splicing recombination to the first digital signal is the first digital signal of duplication, can obtain
Obtain four more the second digital signals of tunnel of data point number.Then interpolation processing is carried out to the second digital signal, obtains third number
Signal, data after interpolation processing are closer to the amplitude variable condition of true line, that is, third digital signal can
The case where analogue signal amplitude variation sensed when more accurately reaction straight line beam current signal is popped one's head in by BPM.To third number
Word signal is filtered, by third digital signal by the duplicate letter of the introduced frequency of splicing and interpolation processing
The removal of number ingredient, obtains the 4th digital signal, then according to the 4th digital signal of four tunnels, obtains beam position data.Finally will
Beam position data are uploaded by network and are stored in database.
Further, further includes:
Reduction of speed module: for carrying out reduction of speed processing to four the second digital signals of tunnel.
In an embodiment of the present invention, interpolation processing is carried out to the second digital signal, will lead to the number of third digital signal
It is got higher according to rate, the data rate of the third digital signal after several times of interpolation processings is possible to be more than what fpga chip was supported
Peak data rate.Before carrying out interpolation processing to the second digital signal, reduction of speed processing, energy first are carried out to the second digital signal
Enough ensure that the data rate of third digital signal is no more than the peak data rate that fpga chip is supported, improves the stabilization of measurement
Property.
Further, the reduction of speed multiple of the second digital signal and the interpolation multiple of the second digital signal are equal.
In an embodiment of the present invention, the interpolation multiple phase of the reduction of speed multiple of the second digital signal and the second digital signal
Deng can guarantee that the data rate of third digital signal is identical as the data rate of the second digital signal before reduction of speed, avoid
The data rate of three digital signals is more than the peak data rate that fpga chip is supported, improves the stability of measurement.
Further, filter module: for removing in four tunnel third digital signals by splicing and interpolation processing institute
The duplicate signal component of the frequency of introducing obtains the 4th digital signal of four tunnels.
In an embodiment of the present invention, it removes introduced by splicing and interpolation processing in four tunnel third digital signals
The duplicate signal component of frequency, obtain the 4th digital signal of four tunnels, to improve the accuracy of measurement.
Further, processing module: integrating for the absolute value respectively to the 4th digital signal of four tunnels, obtains four tunnels
The range value of straight line beam current signal obtains beam position data according to the range value of four road straight line beam current signals.
In an embodiment of the present invention, the absolute value of the 4th digital signal of four tunnels is integrated respectively, obtains four Lu Zhi
The range value of line beam current signal is respectively VA、VB、VC、VD, VAIndicate the straight line beam current signal by coaxial transmission cable A transmission
Amplitude, VBIndicate the amplitude of the straight line beam current signal by coaxial transmission cable B transmission, VCIt indicates to pass by coaxial transmission cable C
The amplitude of defeated straight line beam current signal, VDThe amplitude for indicating the straight line beam current signal by coaxial transmission cable D transmission, according to four
The range value and difference of road straight line beam current signal and than formula obtain beam position data (X, Y), wherein X=(VA-VC)/(VA+
VC), Y=(VB-VD)/(VB+VD)。
In the case where straight line line signal amplitude is 1V, straight line BPM sensor sensitivity coefficient is 12, test result is as schemed
Shown in 5.Test result is shown: X-direction position resolution is 13.469um, and Y-direction position resolution is 14.847um.
The linear accelerator of BEPC II has two kinds of operational modes of positive electron and electronics, and positive electron mode operation is relatively stable.
Therefore, straight line BPM beam testing experimental selection carries out under positive electricity subpattern.When positive electron mode operation, BPM probe detection is arrived
Four tunnel beam current signal amplitude maximums be no more than 8V, straight line number BPM sensor sensitivity coefficient be 12 in the case where, test knot
Fruit is as shown in Figure 6.Test result is shown: X-direction position resolution is 36.273um, and Y-direction position resolution is 35.296um.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (10)
1. a kind of method using number BPM measurement linear accelerator beam position, which comprises the following steps:
Obtain line trigger signal and four road straight line beam current signals；
According to the line trigger signal, the straight line beam current signal described in four tunnels carries out windowing interception respectively, obtains four tunnels first
Digital signal；
The first digital signal described in four tunnels carries out splicing recombination, obtains four the second digital signals of tunnel, wherein second number
Signal is obtained by replicating first digital signal；
The second digital signal described in four tunnels carries out interpolation processing, obtains four tunnel third digital signals；
The third digital signal described in four tunnels is filtered, and obtains the 4th digital signal of four tunnels；
The 4th digital signal according to four tunnels obtains beam position data.
2. the method according to claim 1 using number BPM measurement linear accelerator beam position, which is characterized in that
Second digital signal described in tetra- tunnel Dui carries out interpolation processing, before obtaining four tunnel third digital signals, further includes, to four tunnel institutes
It states the second digital signal and carries out reduction of speed processing.
3. the method according to claim 2 using number BPM measurement linear accelerator beam position, which is characterized in that
The reduction of speed multiple of second digital signal and the interpolation multiple of second digital signal are equal.
4. the method according to claim 1 using number BPM measurement linear accelerator beam position, which is characterized in that
The third digital signal described in four tunnels is filtered, and obtains the 4th digital signal of four tunnels, including, remove third described in four tunnels
By the duplicate signal component of the introduced frequency of splicing and interpolation processing in digital signal, the 4th number described in four tunnels is obtained
Word signal.
5. the method according to claim 1 using number BPM measurement linear accelerator beam position, which is characterized in that
The 4th digital signal according to four tunnels obtains beam position data, including,
The absolute value of the 4th digital signal described in four tunnels integrates respectively, obtains the amplitude of straight line beam current signal described in four tunnels
Value obtains the beam position data according to the range value of straight line beam current signal described in four tunnels.
6. a kind of system using number BPM measurement linear accelerator beam position characterized by comprising
Signal acquisition module: for obtaining line trigger signal and four road straight line beam current signals；
Open a window interception module: for according to the line trigger signal, the straight line beam current signal described in four tunnels to open a window respectively
Interception obtains four the first digital signals of tunnel；
Splicing module: carrying out splicing recombination for the first digital signal described in four tunnels, obtain four the second digital signals of tunnel,
In, second digital signal is obtained by replicating first digital signal；
Interpolating module: interpolation processing is carried out for the second digital signal described in four tunnels, obtains four tunnel third digital signals；
Filter module: being filtered for the third digital signal described in four tunnels, obtains the 4th digital signal of four tunnels；
Processing module: being used for the 4th digital signal according to four tunnels, obtains beam position data.
7. the system according to claim 6 using number BPM measurement linear accelerator beam position, which is characterized in that
Further include:
Reduction of speed module: reduction of speed processing is carried out for the second digital signal described in four tunnels.
8. the system according to claim 7 using number BPM measurement linear accelerator beam position, which is characterized in that
The reduction of speed multiple of second digital signal and the interpolation multiple of second digital signal are equal.
9. the system according to claim 6 using number BPM measurement linear accelerator beam position, which is characterized in that
The filter module: for removing in third digital signal described in four tunnels by frequency that splicing and interpolation processing are introduced
Duplicate signal component obtains the 4th digital signal described in four tunnels.
10. the system according to claim 6 using number BPM measurement linear accelerator beam position, which is characterized in that
The processing module: integrating for the absolute value of the 4th digital signal described in four tunnels respectively, obtains straight line described in four tunnels
The range value of beam current signal obtains the beam position data according to the range value of straight line beam current signal described in four tunnels.
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