CN209092547U - The detuning detection unit of frequency cavity - Google Patents
The detuning detection unit of frequency cavity Download PDFInfo
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- CN209092547U CN209092547U CN201821215998.7U CN201821215998U CN209092547U CN 209092547 U CN209092547 U CN 209092547U CN 201821215998 U CN201821215998 U CN 201821215998U CN 209092547 U CN209092547 U CN 209092547U
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Abstract
The utility model provides a kind of detuning detection unit of frequency cavity, including data acquisition module and processor module；Data acquisition module directly acquires the sampled signal of frequency cavity cavity；Processor module includes FPGA；Processor module is connected with data acquisition module, carries out digital phase detection to the sampled signal of data collecting module collected and obtains phase parameter, and phase parameter is carried out linear fit, detuning phase angle is calculated.The utility model is used for proton or cancer Therapy with Heavy Ion Beams device linear accelerator automatic tuning system under pulse mode, makes frequency cavity work in resonant state.
Description
Technical field
The utility model relates to accelerator low level control technical field more particularly to a kind of detuning detection of frequency cavity are single
Member.
Background technique
Resonant cavity is as proton or the important component of cancer Therapy with Heavy Ion Beams device linear accelerator radio frequency system, in grain
Son plays an important role during accelerating.The key characteristic of resonant cavity is natural resonance frequency and chamber impedance, accelerator
Resonant cavity is under resonant state when normal work, and intrinsic frequency and high frequency references frequency are almost the same, chamber impedance and transmitting
Machine matches substantially, and output power of transmitter is transferred to resonant cavity, and the acceleration for meeting physics acceleration voltage requirement is established in cavity
Electric field realizes the acceleration to charged particle.In actual motion, due to the size of output high frequency power, the power of line, chamber
Body loss fever causes the influence of the factors such as physical deformation, mechanical oscillation, and the intrinsic frequency of resonant cavity can change, and makes cavity
Intrinsic frequency and high frequency references frequency are inconsistent, cause cavity detuning.Therefore need the detuning detection unit of cavity to detuning situation
It is detected, and cavity tuner is controlled according to detuning situation, make the detuning holding of cavity in allowed limits.
The prior art measures cavity Tune-out angle using the input/output signal of high frequency cavity, and Tune-out angle is defined as cavity sampling
The phase difference of signal and input signal, according to cavity input-output characteristic, under cavity resonant state, Tune-out angle zero, output
Amplitude is maximum；The phase parameter that cavity input and sampled signal is measured by phase demodulation link, then carries out than phase, while passing through inspection
Wave link measures sampled signal amplitude, and comparison phase result carries out phasing according to sampled signal range parameter, obtains cavity and loses
Humorous angle.
But it there is problems in currently available technology, firstly, needing to measure simultaneously according to cavity input-output characteristic
The stable phase parameter of forward signal and sampled signal, for proton or cancer Therapy with Heavy Ion Beams device linear accelerator general work
In the pulsing mode, RF pulse width is generally several hundred a microseconds, and the prior art needs to reject the transient state of lower edge in pulse
Response process；Secondly prior art needs to measure Tune-out angle, to taking the carrying out than phase of forward signal and sampled signal, but due to depositing
The phase shift caused by the factors such as length of cable needs to carry out phasing according to sampled signal range parameter than phase result, different
School phase again is needed under output power；Finally, the prior art, in phase demodulation detection, forward signal and sampled signal need to pass through mould
Quasi- radio-frequency front-end is converted to intermediate-freuqncy signal, and analog video front end is easy to be influenced by factors such as temperature, needs to be placed on insulating box
In.Therefore, the prior art is also urgently to be improved and developed.
Utility model content
(1) technical problems to be solved
The utility model provides a kind of detuning detection unit of frequency cavity, at least partly to solve technology set forth above
Problem.
(2) technical solution
One aspect according to the present utility model, providing a kind of detuning detection unit of frequency cavity includes: data acquisition module
Block and processor module；Data acquisition module directly acquires the sampled signal of frequency cavity cavity；Processor module includes FPGA；Place
Reason device assembly is connected with data acquisition module, carries out digital phase detection to the sampled signal of data collecting module collected and obtains phase ginseng
Number, and phase parameter is subjected to linear fit, detuning phase angle is calculated.
In some embodiments of the utility model, FPGA includes: IQ demodulation module, digital phase detection module and detuning calculating
Module；IQ demodulation module obtains IQ parameter；Digital phase detection module obtains phase parameter according to the IQ parameter of acquisition；Detuning calculating mould
Phase parameter is carried out linear fit calculating by block, obtains the detuning information Δ ω of frequency cavity cavity；It is calculated according to detuning information Δ ω
Off-resonance frequency Δ f；Detuning phase angle is calculated according to off-resonance frequency Δ f and known parameters Q1.
In some embodiments of the utility model, processor module further includes DSP, and DSP is connected with FPGA, to FPGA into
Row auxiliary operation processing.
In some embodiments of the utility model, data acquisition module is analog-digital converter.
In some embodiments of the utility model, the resolution ratio of analog-digital converter is 8,10,12 and/or 16
Any one of.
(3) beneficial effect
It can be seen from the above technical proposal that the detuning detection unit of the utility model frequency cavity at least has below beneficial to effect
One of fruit or in which a part:
(1) data acquisition module directly acquires the sampled signal of frequency cavity cavity, effectively increases the efficiency of sample of signal.
(2) digital phase detection is completed in FPGA, the advantage for making full use of FPGA Fast Fixed-point to handle.
It (3), can be more quasi- by sample point linear fit during the failing edge of frequency cavity sampled signal phase curve
True test chamber is detuning, is suited to speed up device frequency cavity resonance frequency control system, and then is applied to biological (medical treatment), space flight
With the fields such as industry.
(4) DSP is connect with FPGA, carries out auxiliary operation processing to FPGA by using DSP, to give full play to the floating of DSP
The advantage of the Fast Fixed-point of point processing ability and FPGA processing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the detuning detection unit of the utility model embodiment frequency cavity.
Fig. 2 is the flow diagram of the detuning detection method of the utility model embodiment frequency cavity.
Fig. 3 is the utility model embodiment frequency cavity input and output amplitude-phase characteristic.
Fig. 4 is the utility model embodiment frequency cavity sampled signal phase curve.
Fig. 5 is the structural schematic diagram of another detuning detection unit of embodiment medium-high frequency chamber of the utility model.
Specific embodiment
The utility model provides a kind of detuning detection unit of frequency cavity.The detuning detection of frequency cavity provided by the utility model
Unit includes data acquisition module and processor module；Data acquisition module directly acquires the sampled signal of frequency cavity cavity；Place
Managing device assembly includes FPGA；Processor module is connected with data acquisition module, to the sampled signal of data collecting module collected into
Row digital phase detection obtains phase parameter, and phase parameter is carried out linear fit, detuning phase angle is calculated.The utility model
For the proton or cancer Therapy with Heavy Ion Beams device linear accelerator automatic tuning system under pulse mode, make frequency cavity work humorous
Vibration state.
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to attached drawing, the utility model is further described.
The utility model some embodiments will be done referring to appended attached drawing in rear and more comprehensively describe to property, some of but simultaneously
Not all embodiment will be shown.In fact, the various embodiments of the utility model can be realized in many different forms, without
It should be construed as limited to this several illustrated embodiment；Relatively, it theses embodiments are provided so that the utility model meets to be applicable in
Legal requirement.
In first exemplary embodiment of the utility model, a kind of detuning detection unit of frequency cavity is provided.Fig. 1 is
The structural schematic diagram of the detuning detection unit of the utility model embodiment frequency cavity.As shown in Figure 1, the utility model frequency cavity is detuning
Detection unit, comprising: data acquisition module and processor module.Data acquisition module directly acquires the sampling letter of frequency cavity cavity
Number；Processor module includes FPGA；Processor module is connected with data acquisition module, believes the sampling of data collecting module collected
Number carrying out digital phase detection obtains phase parameter, and phase parameter is carried out linear fit, detuning phase angle is calculated.FPGA packet
It includes: IQ demodulation module, digital phase detection module and detuning computing module；IQ demodulation module obtains IQ parameter.Digital phase detection module root
Phase parameter is obtained according to the IQ parameter of acquisition.Phase parameter is carried out linear fit calculating by detuning computing module, obtains frequency cavity
The detuning information Δ ω of cavity；Off-resonance frequency Δ f is calculated according to detuning information Δ ω；According to off-resonance frequency Δ f and known parameters Ql
Calculate detuning phase angle.Data acquisition module is analog-digital converter.The resolution ratio of analog-digital converter be 8,10,12 and/or
Any one of 16, here preferably with 16.
In first exemplary embodiment of the utility model, a kind of detuning detection method of frequency cavity is additionally provided.Fig. 2
For the flow diagram of the detuning detection method of the utility model embodiment frequency cavity.As shown in Figure 2, comprising: step A: in frequency cavity
Sampled signal passes through data collecting module collected sample point；Step B: sample point carries out number by the FPGA in processor module
Phase demodulation, and phase parameter is subjected to linear fit, acquire the detuning information Δ ω of frequency cavity cavity；Step C: according to frequency cavity cavity
Detuning information Δ ω is calculated and is obtained off-resonance frequency Δ f；Step D: according to frequency cavity cavity known parameters Q1 and off-resonance frequency Δ f,
Calculate detuning phase angle.
Fig. 3 is the utility model embodiment frequency cavity input and output amplitude-phase characteristic.As shown in figure 3, in resonant state
Under, Tune-out angle zero, output amplitude maximum.Fig. 4 is the utility model embodiment frequency cavity sampled signal phase curve.Such as Fig. 4
It is shown, in step A, according to the line style between frequency cavity cavity sampled signal expression formula medium-high frequency chamber cavity sampled signal and time t
Relationship, collecting sample point；Frequency cavity cavity sampled signal expression formula are as follows:
Wherein, V (t) is frequency cavity cavity sampled signal, and A is amplitude, and f is frequency, and t is the time,For phase.
Step B further include:
Sub-step B1: IQ parameter, the expression formula of IQ parameter are obtained by IQ demodulation module are as follows:
Wherein, I is in-phase component, and Q is quadrature component, and A is amplitude,For phase.
Sub-step B2: by digital phase detection module, phase ginseng is obtained in the failing edge of frequency cavity sampled signal phase curve
Number, phase parameter expression formula are as follows:
Wherein,For phase, I is in-phase component, and Q is quadrature component.
Sub-step B3: by detuning computing module, phase parameter is subjected to linear fit calculating, frequency cavity cavity is obtained and loses
Humorous information Δ ω.
In step C, according to the detuning information Δ ω of frequency cavity cavity, calculates and obtain off-resonance frequency Δ f, off-resonance frequency Δ f table
Up to formula are as follows:
Wherein, Δ ω is detuning information, and Δ f is off-resonance frequency.
In step D, detuning phase angle expression formula is
Wherein, θ is detuning phase angle, and Δ f is off-resonance frequency, and f is frequency, QlFor cavity quality factor.
In second exemplary embodiment of the utility model, Fig. 5 is another embodiment medium-high frequency chamber of the utility model
The structural schematic diagram of detuning detection unit.As shown in figure 5, the difference of the present exemplary embodiment and first exemplary embodiment exists
It further include DSP in the processor module of the detuning detection unit of frequency cavity, DSP is connected with FPGA, carries out auxiliary operation to FPGA
Processing gives full play to the advantage of the floating-point operation ability of DSP and the Fast Fixed-point processing of FPGA.
So far, attached drawing is had been combined the utility model embodiment is described in detail.It should be noted that in attached drawing
Or in specification text, the implementation for not being painted or describing is shape known to a person of ordinary skill in the art in technical field
Formula is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various
Specific structure, shape or mode, those of ordinary skill in the art simply can be changed or be replaced to it.
According to above description, those skilled in the art should have the detuning detection unit of the utility model frequency cavity clear
Understanding.
In conclusion the detuning detection unit of frequency cavity provided by the utility model, suitable under pulse mode proton or
Cancer Therapy with Heavy Ion Beams device linear accelerator automatic tuning system makes frequency cavity work in resonant state.
It should also be noted that, the direction term mentioned in embodiment, for example, "upper", "lower", "front", "rear", " left side ",
" right side " etc. is only the direction with reference to attached drawing, is not used to limit the protection scope of the utility model.Through attached drawing, identical member
Element is indicated by same or similar appended drawing reference.When may cause the understanding to the utility model and cause to obscure, will omit
Conventional structure or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only the utility model are illustrated to implement
The content of example.In addition, in the claims, any reference symbol between parentheses should not be configured to claim
Limitation.
It unless there are known entitled phase otherwise anticipates, the numerical parameter in this specification and appended claims is approximation, energy
The resulting required characteristic changing of content that enough bases pass through the utility model.Specifically, all be used in specification and right
The number of content, reaction condition of composition etc. is indicated in it is required that, it is thus understood that be the term by " about " in all situations
It is modified.Under normal circumstances, express meaning refer to comprising by specific quantity ± 10% variation in some embodiments,
± 5% variation in some embodiments, ± 1% variation in some embodiments, in some embodiments ± 0.5% change
Change.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.It is located in front of the element
Word "a" or "an" does not exclude the presence of multiple such elements.
In addition, unless specifically described or the step of must sequentially occur, there is no restriction in the above institute for the sequence of above-mentioned steps
Column, and can change or rearrange according to required design.And above-described embodiment can be based on the considerations of design and reliability, that
This mix and match is used using or with other embodiments mix and match, i.e., the technical characteristic in different embodiments can be freely combined
Form more embodiments.
Similarly, it should be understood that in order to simplify the utility model and help to understand one or more in each open aspect
A, in the description above to the exemplary embodiment of the utility model, each feature of the utility model is divided together sometimes
Group is into single embodiment, figure or descriptions thereof.However, the method for the disclosure should not be construed to reflect following meaning
Figure: the requires of the utility model features more more than feature expressly recited in each claim i.e. claimed.
More precisely, as reflected in the following claims, open aspect is less than single implementation disclosed above
All features of example.Therefore, it then follows thus claims of specific embodiment are expressly incorporated in the specific embodiment,
In separate embodiments of each claim as the utility model itself.
Particular embodiments described above has carried out into one the purpose of this utility model, technical scheme and beneficial effects
Step is described in detail, it should be understood that being not limited to this foregoing is merely specific embodiment of the utility model
Utility model, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all wrap
Containing being within the protection scope of the utility model.
Claims (5)
1. a kind of detuning detection unit of frequency cavity, comprising:
Data acquisition module directly acquires the sampled signal of frequency cavity cavity；
Processor module, the processor module include FPGA；The processor module is connected with the data acquisition module, right
The sampled signal of the data collecting module collected carries out digital phase detection and obtains phase parameter, and phase parameter is carried out Linear Quasi
It closes, detuning phase angle is calculated.
2. the detuning detection unit of frequency cavity according to claim 1, it is characterised in that: the FPGA includes:
IQ demodulation module obtains IQ parameter；
Digital phase detection module obtains phase parameter according to the IQ parameter of acquisition；
Phase parameter is carried out linear fit calculating, obtains the detuning information Δ ω of frequency cavity cavity by detuning computing module；According to mistake
Humorous information Δ ω calculates off-resonance frequency Δ f；Detuning phase angle is calculated according to off-resonance frequency Δ f and known parameters Q1.
3. the detuning detection unit of frequency cavity according to claim 1, it is characterised in that: the processor module further includes
DSP, the DSP are connected with the FPGA, carry out auxiliary operation processing to the FPGA.
4. the detuning detection unit of frequency cavity according to claim 1, it is characterised in that: the data acquisition module is modulus
Converter.
5. the detuning detection unit of frequency cavity according to claim 4, it is characterised in that: the resolution ratio of the analog-digital converter
It is any one of 8,10,12 and/or 16.
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| CN201821215998.7U CN209092547U (en) | 2018-07-26 | 2018-07-26 | The detuning detection unit of frequency cavity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108815723A (en) * | 2018-07-26 | 2018-11-16 | 中国科学院近代物理研究所 | The detuning detection unit of frequency cavity and its detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108815723A (en) * | 2018-07-26 | 2018-11-16 | 中国科学院近代物理研究所 | The detuning detection unit of frequency cavity and its detection method |
| CN108815723B (en) * | 2018-07-26 | 2024-01-30 | 中国科学院近代物理研究所 | High-frequency cavity detuning detection unit and detection method thereof |
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