CN108120888A - New cyclotron range stability measuring system - Google Patents
New cyclotron range stability measuring system Download PDFInfo
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- CN108120888A CN108120888A CN201711330335.XA CN201711330335A CN108120888A CN 108120888 A CN108120888 A CN 108120888A CN 201711330335 A CN201711330335 A CN 201711330335A CN 108120888 A CN108120888 A CN 108120888A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a kind of new cyclotron range stability measuring system, pickup sampled signals extract cavity signal, and the sampled signal measured as range stability by capacitive coupling；Signal-regulated kinase includes voltage-controlled amplifier and voltage-controlled attenuator, and Signal-regulated kinase is used for by the dynamic range of sampled signal conditioning to digitlization kinetic filter, and by signal output to digitizing kinetic filter；Digitizing dynamic cymoscope includes analog-digital converter, programmable gate array, phaselocked loop and power module；It is mainly that new cyclotron range stability provides signal processing and display function that LABVIEW, which shows control interface,.The sampled signal that the present invention can be directed to cavity carries out accurate detection shaping, and export for Transistor-Transistor Logic level digital high precision dynamic rectified signal, the present invention have the characteristics that system integration degree it is high, it is small, be simple to manufacture, be stable and reliable for performance, versatility it is good.
Description
Technical field
The invention belongs to cyclotron technical fields, are specifically related to new cyclotron range stability measurement system
System.
Background technology
Superconducting cyclotron is more and more widely used because of characteristics such as its distinctive compact nature and low-power consumption in PET
The medical domains such as (positron emission tomography) diagnosis, Isotope production and proton therapeutic.Wherein, resonator
It is superconducting cyclotron one of the ost important components, resonator mainly provides the electric field of ion acceleration.The working condition of resonator
Directly affect quality of beam.But due to electromagnetic thermal effect, mechanical oscillation, beam current distribution during resonator is run
Etc. factors, can cause that resonator cannot stablize operate in as defined under working condition, cause power source reflection power excessive, damage
Bad Transmission system and power source, the detuning of resonator cause the unstable decline for causing quality of beam of resonator gap voltage and beam
Stream is lost.In order to solve problems, amplitude stabilization control system is the main of cyclotron cavity low level control system
Component, major function are to complete the setting of the high frequency amplitude between entire each cavity of accelerator system and stabilization, clutter
Inhibition of modulation etc..With the raising of digitizing technique, high frequency low level control both domestic and external experienced real from pure analogue technique
It now arrives half simulation Semi-digital to realize, then is realized to pure digi-tal technology, superconducting cyclotron SC200 is in order to keep low level control
The low latency of system and flexibility realize that low level control system is completed to accelerate superconducting cyclotron using half simulation Semi-digital technology
The stability contorting of device cavity voltage.Reach 0.04% for the long-term range stability requirement of superconducting cyclotron SC200, this
With regard to needing a kind of measuring system that can measure the amplitude of superconducting cyclotron.Superconducting cyclotron range stability measurement side
Method can be divided into three classes, and one kind is using Spectrum Method and oscilloscope method, and this method is mainly by by cavity sampled signal and frequency spectrograph
It is connected directly, the voltage signal of cavity is extracted by frequency spectrograph, so as to judge the stability characteristic (quality) of cavity voltage, the advantages of this method
It is direct convenience, it is easily operated.But the measurement error that interference is larger to cause voltage-regulation coefficient is larger, suitable for clutter and noise compared with
Mini system.One kind uses SR844 lock-in amplifier measuring amplitude stabilitys, identical with Spectrum Method connection mode, and cavity is sampled
Signal and SR844 lock-in amplifiers are connected directly, and the voltage signal of cavity are extracted by SR844 lock-in amplifiers, so as to judge
The stability characteristic (quality) of cavity voltage.Since the gain accuracy of measuring instrument SR844 lock-in amplifiers is ± 0.25dB, gain stabilization
Spend for 0.2%/DEG C, the required accuracy of measuring amplitude Stability index is not achieved.So SR844 lock-in amplifiers measurement result is only
As reference.In addition the method for a kind of measurement cavity range stability is the indirect method of measurement, and this method is by the cavity signal of extraction
Dynamic cymoscope is all simulated in transmission, and the defeated value that goes out for simulating dynamic cymoscope then is passed to dynamic signal analyzer.The measurement
Method compare it is higher with first two measuring method precision, but this system mainly using analog device realize, have volume
Greatly, the shortcomings of low in energy consumption, is gradually eliminated in High Definition Systems.Microwave detector and digital quadrature detector gradually into
For new detecting way, microwave detector counts mainly by extraction of the microwave device realization to amplitude and direct decision operation
Word quadrature detector is mainly extracted by direct sampled data after AD samplings into line amplitude and decision operation.
The content of the invention
It is an object of the invention to provide new cyclotron range stability measuring systems, can be directed to taking for cavity
Sample signal carries out accurate detection shaping, and exports the digital high precision dynamic rectified signal for Transistor-Transistor Logic level, and the present invention, which has, is
System integration degree is high, it is small, be simple to manufacture, be stable and reliable for performance, the features such as versatility is good.
The purpose of the present invention can be achieved through the following technical solutions：
New cyclotron range stability measuring system, including Pickup sampled signals, Signal-regulated kinase, number
Change kinetic filter, Labview shows control interface；
The pickup sampled signals extract cavity signal, and the sampling measured as range stability by capacitive coupling
Signal；
The Signal-regulated kinase includes voltage-controlled amplifier and voltage-controlled attenuator, and the Signal-regulated kinase is used to sample
Signal condition is in the dynamic range of digitlization kinetic filter, and by signal output to digitizing kinetic filter；
The digitlization dynamic cymoscope includes analog-digital converter, programmable gate array, phaselocked loop and power supply
Module；
It is mainly that new cyclotron range stability provides signal processing and display work(that the LABVIEW, which shows control interface,
Energy.
Further, the analog-digital converter carries out analog-to-digital conversion after obtaining sampled signal, obtains digital sample letter
Number, and export to programmable gate array.
Further, the programmable gate array is used to carry out digital detection to sampled signal, and exports TTL numbers
Logical waveform, the programmable gate array include digitised envelope extraction module, envelope shaping module, adaptively dynamically sentence
Certainly threshold module and video pulse Shaping Module.
Further, the digitised envelope extraction module extracts digital sample by digitizing extract real-time envelope technique
The amplitude information of signal carrier in signal, and obtain the signal envelope of input sampled signal.
Further, the adaptive dynamic decision threshold module forms dynamic to the signal envelope by envelope shaping and sentences
Certainly thresholding, and adjudicated compared with the signal envelope by delay, obtain the video pulse of TTL waveforms.
Further, the video pulse Shaping Module carries out the video pulse of TTL waveforms shaping pulse, hardness removal
Time duration is less than the spuious short pulse of burr of setting value.
Further, the phaselocked loop provides system clock for analog-digital converter and programmable gate array.
Further, the power module provides high stability dc power supply for digitlization dynamic cymoscope.
Further, the digitised envelope extraction module is by signal orthogonalization by obtaining real-time I/Q two paths of data, and
Extract signal amplitude.
Further, the adaptive dynamic decision threshold technique that the adaptive dynamic decision threshold module uses, refers to
According to the noise floor of sampled signal amplitude, decision threshold that is adaptive, dynamically adjusting pulse, and it is true according to decision threshold
Surely the amplitude of the video pulse of TTL waveforms is exported, if the amplitude of signal envelope is less than decision threshold, otherwise output 0 exports 1,
To remove the trailing phenomenon of rising edge and trailing edge.
Beneficial effects of the present invention：
(1) present invention using Digital Signal Processing method to the hangover of the rising edge and trailing edge of cavity sampled signal into
Row accurate calibration, the small TTL pulse signal of outputting standard, shake is the measurement of back-end system and simultaneously provides stable reference
Signal obtains the measurement accuracy that the 1-2 order of magnitude is promoted than simulation dynamic detection techniques；
(2) used in the programmable gate array in the present invention " high-efficiency digital orthogonalization technique " and " automatic to adapt to
Two key technologies of dynamic decision thresholding " have each served as the digitized hardware resource of saving and have ensured the survey of Time delay variation
The effect of accuracy of measurement.Meanwhile using the digitized processing structure based on FPGA, take full advantage of FPGA and digitized processing from
Body advantage, ensure that system integration degree it is high, it is small, manufacture and to debug that simple, stable and reliable for performance, versatility is good etc. special
Property；
(3) system hardware testing the result shows that, present invention shake ahead of the curve, Time delay variation and output pulse precision etc.
Important indicator has all reached the magnitude of 10ns or so, and 5ns is even less than under partial picture.Simulation dynamic is greatly exceeded in performance
The precision property of wave detector (usually in more than 200ns).
Description of the drawings
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Fig. 1 is the system construction drawing of the present invention；
Fig. 2 is the hardware circuit board connection framework figure of the present invention；
Fig. 3 is the work flow diagram of adaptive dynamic decision threshold module in programmable gate array of the invention；
Fig. 4 is the decision threshold side of being formed in adaptive dynamic decision threshold module in the programmable gate array of the present invention
Formula schematic diagram.
Specific embodiment
New cyclotron range stability measuring system, including Pickup sampled signals, Signal-regulated kinase, number
Change kinetic filter, Labview show control interface, as shown in Figure 1；
The pickup sampled signals extract cavity signal, and the sampling measured as range stability by capacitive coupling
Signal；
The Signal-regulated kinase includes voltage-controlled amplifier and voltage-controlled attenuator, and Signal-regulated kinase is used for sampled signal
In the dynamic range for nursing one's health digitlization kinetic filter, and by signal output to digitizing kinetic filter；
The digitlization dynamic cymoscope includes analog-digital converter, programmable gate array, phaselocked loop and power supply
Module；
The analog-digital converter carries out analog-to-digital conversion after obtaining sampled signal, obtains digital sampled signal, and exports
To programmable gate array；
Preferably, the analog to digital converter realizes that band logical is adopted to be more than the sampling rate of 400MHz to input signal
Sample；
In the present embodiment, A/D sampling rates are the AD9684 of 500MHz, when sampling rate is too low, cause lack sampling, from
And the performance of system is made drastically to deteriorate；In addition, in order to meet the high-precision Time delay variation of index request, also it is necessary to adopt big
In the sampling rate of 400MHz；
The programmable gate array is used to carry out digital detection to sampled signal, and exports TTL Digital Logic waveforms,
Preferably, programmable gate array is the FPGA of EP2C8T144C8N；
Wherein, the programmable gate array includes digitised envelope extraction module, envelope shaping module, adaptively moves
State decision threshold module and video pulse Shaping Module；
The digitised envelope extraction module is believed by digitizing extract real-time envelope technique and extracting in digital sampled signal
The amplitude information of number carrier wave, and obtain the signal envelope of input sampled signal；
Preferably, digitised envelope extraction module by signal orthogonalization by obtaining real-time I/Q two paths of data, and extracts letter
Number amplitude；
Preferably, in digital information processing system extract signal envelope include Hilbert (Hilbert) amplitude demodulation method,
Detection-filter method and high pass absolute value demodulation method, using Hilbert (Hilbert) amplitude demodulation method in the present embodiment,
For signal in itself, imaginary part converts the real part of analytic signal obtained by Hilbert conversion for its Hilbert, the amplitude of analytic signal
The as envelope of signal, in the present embodiment, Hilbert is realized by FFT；
Assuming that giving continuous time signal x (t), Hilbert conversion is set to X (t), and Hilbert converters are amplitude
Characteristic is 1 all-pass filter, after signal is by Hilbert converters, the phase shift of+90 ° of negative frequency component work, and positive frequency
Into the phase shift for being allocated as -90 °.Z (t) is set to the analytic signal of signal, then has：
Z (t)=x (t)+j X (t)
Since x (t) is by the intermediate-freuqncy signal of envelope signal modulation, can be denoted as：
X (t)=A (t) * cos (wt+ φ)
Then：X (t)=A (t) * sin (wt+ φ)
According to the characteristics of analytic signal：
Z (t)=A (t) * cos (wt+ φ)+j A (t) * sin (wt+ φ)=A (t) * ej (wt+ φ)
Envelope signal A (t) i.e. can obtain to z (t) modulus：
| (t) |=| A (t) * ej(wt+φ)|=| A (t) |=A (t)
To the discrete signal x (n) that x (t) samplings obtain afterwards, its analytic signal z can also be obtained with same method
(t)；
The envelope shaping module carries out envelope shaping after obtaining signal envelope, offsets interference of the noise to signal envelope,
Preferably, progress digital smoothness is further processed after envelope shaping module filters out high-frequency noise by bandpass filter；
The adaptive dynamic decision threshold module forms dynamic decision thresholding to the signal envelope by envelope shaping, and
It is adjudicated compared with the signal envelope by delay, obtains the video pulse of TTL waveforms；
Preferably, the adaptive dynamic decision threshold technique that the adaptive dynamic decision threshold module uses, refers to root
According to the noise floor of sampled signal amplitude, adaptively, the decision threshold of pulse is dynamically adjusted, and determined according to decision threshold
The amplitude of the video pulse of TTL waveforms is exported, if the amplitude of signal envelope is less than decision threshold, otherwise output 0 exports 1, with
Remove the trailing phenomenon of rising edge and trailing edge；
As shown in figure 3, the process that the adaptive dynamic decision threshold module carries out adaptive dynamic decision thresholding includes
Following steps：
Whether S1, judgement current signal magnitude are more than noise gate ζ 2, if signal is less than noise gate ζ 2, take decision gate
The 1/2 of amplitude peak is limited to, as shown in Figure 4；If signal is more than noise gate ζ 2, illustrate there are useful signal, then to trigger more
The amplitude peak of new sampled signal；
S2, when accumulative signal length is more than T2=4us, decision gate is updated according to the amplitude peak of current sample signal
Limit ζ 1；
S3, decision threshold ζ 1 is updated according to dynamic, is compared judgement by the signal envelope for postponing 4us, obtains TTL ripples
The video pulse of shape；
The video pulse Shaping Module carries out the video pulse of TTL waveforms shaping pulse, hardness removal duration
Length is less than the spuious short pulse of burr of setting value, to remove the ghost pulse information of grass.
The phaselocked loop provides system clock for analog-digital converter and programmable gate array；
The power module provides high stability dc power supply for digitlization dynamic cymoscope；
It is mainly that new cyclotron range stability provides signal processing and display work(that the LABVIEW, which shows control interface,
Energy；
In the present embodiment, as shown in Fig. 2, system includes main circuit board, clock circuit plate and power supply circuit board, main circuit board
On be provided with Signal-regulated kinase, analog-digital converter, programmable gate array, lock phase is provided on clock circuit plate
Ring, power module is provided on power filter plate, and the main circuit board is 116.3x86.4mm26 layers of printed board, for installing
ADC's and FPGA, the clock circuit is 60.7x86.4mm26 layers of printed board, for installing PLL, the power filter electricity
Road is 180x58.6mm26 layers of printed board, for installing power module, the top layer and bottom of 3 pieces of printed boards are signals layer,
Mounting related components, interlayer is one layer of power supply, a layer signal, one layer of simulation ground and power supply, a layer digital；To number and simulation
Isolated from power filters, simulation ground and digitally separated and pass through magnetic bead and connect；3 pieces of circuit boards are shielded using shielding box, both can be real
The space isolation of existing electromagnetic signal, and facilitate the ground connection nearby of radiofrequency signal port, radiofrequency signal is avoided in cabinet inside
It interferes with each other；
By the detailed test of system, frequency input signal is 50-120MHz in the present embodiment, rises edge on the input signals
<100ns and signal rising edge 1us~2us, the Time delay variation of the opposite input modulation pulse of TTL video pulses of output are small
In 5ns；Forward position is shaken is less than 5ns when signal-to-noise ratio is more than 6dB, and 10ns is less than when signal-to-noise ratio is less than 6dB, is surpassed significantly in performance
The precision property of simulation dynamic cymoscope is crossed；
Can be seen that this example from this example can realize detection function to cavity sampled signal well, and have
System integration degree is high, it is small, be simple to manufacture, be stable and reliable for performance, the features such as versatility is good.
More than content is only citing made for the present invention and explanation, and affiliated those skilled in the art are to being retouched
The specific embodiment stated does various modifications or additions or substitutes in a similar way, without departing from the structure of invention
Or surmount scope defined in the claims, it is within the scope of protection of the invention.
Claims (10)
1. new cyclotron range stability measuring system, which is characterized in that including Pickup sampled signals, signal condition
Module, digitlization kinetic filter, Labview show control interface；
The pickup sampled signals extract cavity signal, and the sampling letter measured as range stability by capacitive coupling
Number；
The Signal-regulated kinase includes voltage-controlled amplifier and voltage-controlled attenuator, and the Signal-regulated kinase is used for sampled signal
In the dynamic range for nursing one's health digitlization kinetic filter, and by signal output to digitizing kinetic filter；
The digitlization dynamic cymoscope includes analog-digital converter, programmable gate array, phaselocked loop and power module；
It is mainly that new cyclotron range stability provides signal processing and display function that the LABVIEW, which shows control interface,.
2. new cyclotron range stability measuring system according to claim 1, it is characterised in that：The simulation
Digital quantizer carries out analog-to-digital conversion after obtaining sampled signal, obtains digital sampled signal, and exports to programmable logic gate array
Row.
3. new cyclotron range stability measuring system according to claim 1, it is characterised in that：It is described to compile
Journey logic gate array is used to carry out digital detection to sampled signal, and exports TTL Digital Logic waveforms, the programmable gate
Array includes digitised envelope extraction module, envelope shaping module, adaptive dynamic decision threshold module and video pulse shaping
Module.
4. new cyclotron range stability measuring system according to claim 3, it is characterised in that：The number
Change the amplitude information that envelope extract block extracts signal carrier in digital sampled signal by digitizing extract real-time envelope technique,
And obtain the signal envelope of input sampled signal.
5. new cyclotron range stability measuring system according to claim 3, it is characterised in that：It is described adaptive
Dynamic decision threshold module is answered to form dynamic decision thresholding, and the signal with passing through delay to the signal envelope by envelope shaping
Envelope is compared judgement, obtains the video pulse of TTL waveforms.
6. new cyclotron range stability measuring system according to claim 3, it is characterised in that：The video
Shaping pulse module carries out the video pulse of TTL waveforms shaping pulse, and hardness removal time duration is less than setting value
The spuious short pulse of burr.
7. new cyclotron range stability measuring system according to claim 1, it is characterised in that：The lock phase
Ring provides system clock for analog-digital converter and programmable gate array.
8. new cyclotron range stability measuring system according to claim 1, it is characterised in that：The power supply
Module provides high stability dc power supply for digitlization dynamic cymoscope.
9. new cyclotron range stability measuring system according to claim 1, it is characterised in that：The number
Change envelope extract block by the way that signal orthogonalization is obtained real-time I/Q two paths of data, and extract signal amplitude.
10. new cyclotron range stability measuring system according to claim 1, it is characterised in that：It is described from
The adaptive dynamic decision threshold technique that dynamic decision threshold module uses is adapted to, refers to the noise basis according to sampled signal amplitude
Bottom, decision threshold that is adaptive, dynamically adjusting pulse, and determine according to decision threshold the video pulse of output TTL waveforms
Amplitude, if the amplitude of signal envelope is less than decision threshold, otherwise output 0 exports 1, to remove rising edge and trailing edge
Trailing phenomenon.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711330335.XA CN108120888A (en) | 2017-12-13 | 2017-12-13 | New cyclotron range stability measuring system |
| PCT/CN2018/117786 WO2019114540A1 (en) | 2017-12-13 | 2018-11-28 | Novel cyclotron amplitude stability measurement system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711330335.XA CN108120888A (en) | 2017-12-13 | 2017-12-13 | New cyclotron range stability measuring system |
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| CN108120888A true CN108120888A (en) | 2018-06-05 |
Family
ID=62229778
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| WO (1) | WO2019114540A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108650771A (en) * | 2018-07-12 | 2018-10-12 | 北京航天广通科技有限公司 | Self-excitation stable control method, system and the storage medium of accelerator superconductor cavity |
| CN109600140A (en) * | 2018-12-21 | 2019-04-09 | 陕西航天时代导航设备有限公司 | Realize the digitizing solution of voltage frequency conversioning circuit |
| WO2019114540A1 (en) * | 2017-12-13 | 2019-06-20 | 合肥中科离子医学技术装备有限公司 | Novel cyclotron amplitude stability measurement system |
| CN112240993A (en) * | 2020-10-14 | 2021-01-19 | 中国原子能科学研究院 | Evaluation system and method for compact cyclotron magnetic field stability measurement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553221A (en) * | 1970-12-28 | 1985-11-12 | Hyatt Gilbert P | Digital filtering system |
| US5798730A (en) * | 1997-07-09 | 1998-08-25 | Litton Systems, Inc. | Pulse edge detector with wide dynamic range |
| CN101398481A (en) * | 2008-11-13 | 2009-04-01 | 上海交通大学 | Digital high precision dynamic cymoscope |
| CN106211539A (en) * | 2016-07-29 | 2016-12-07 | 中国原子能科学研究院 | A kind of cyclotron digital stabilising arrangement of ejected beam phase place and method thereof |
| CN205883689U (en) * | 2016-07-29 | 2017-01-11 | 中国原子能科学研究院 | Four resonant cavity's of dual drive high frequency D circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108120888A (en) * | 2017-12-13 | 2018-06-05 | 合肥中科离子医学技术装备有限公司 | New cyclotron range stability measuring system |
-
2017
- 2017-12-13 CN CN201711330335.XA patent/CN108120888A/en active Pending
-
2018
- 2018-11-28 WO PCT/CN2018/117786 patent/WO2019114540A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553221A (en) * | 1970-12-28 | 1985-11-12 | Hyatt Gilbert P | Digital filtering system |
| US5798730A (en) * | 1997-07-09 | 1998-08-25 | Litton Systems, Inc. | Pulse edge detector with wide dynamic range |
| CN101398481A (en) * | 2008-11-13 | 2009-04-01 | 上海交通大学 | Digital high precision dynamic cymoscope |
| CN106211539A (en) * | 2016-07-29 | 2016-12-07 | 中国原子能科学研究院 | A kind of cyclotron digital stabilising arrangement of ejected beam phase place and method thereof |
| CN205883689U (en) * | 2016-07-29 | 2017-01-11 | 中国原子能科学研究院 | Four resonant cavity's of dual drive high frequency D circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019114540A1 (en) * | 2017-12-13 | 2019-06-20 | 合肥中科离子医学技术装备有限公司 | Novel cyclotron amplitude stability measurement system |
| CN108650771A (en) * | 2018-07-12 | 2018-10-12 | 北京航天广通科技有限公司 | Self-excitation stable control method, system and the storage medium of accelerator superconductor cavity |
| CN109600140A (en) * | 2018-12-21 | 2019-04-09 | 陕西航天时代导航设备有限公司 | Realize the digitizing solution of voltage frequency conversioning circuit |
| CN109600140B (en) * | 2018-12-21 | 2023-04-28 | 陕西航天时代导航设备有限公司 | Digital method for realizing voltage frequency conversion circuit |
| CN112240993A (en) * | 2020-10-14 | 2021-01-19 | 中国原子能科学研究院 | Evaluation system and method for compact cyclotron magnetic field stability measurement |
| CN112240993B (en) * | 2020-10-14 | 2021-07-20 | 中国原子能科学研究院 | Evaluation system and method for compact cyclotron magnetic field stability measurement |
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| Publication number | Publication date |
|---|---|
| WO2019114540A1 (en) | 2019-06-20 |
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Application publication date: 20180605 |