CN114980473B - Method and device for adjusting parasitic oscillation frequency of high-frequency system of particle accelerator - Google Patents

Method and device for adjusting parasitic oscillation frequency of high-frequency system of particle accelerator Download PDF

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Publication number
CN114980473B
CN114980473B CN202210502187.XA CN202210502187A CN114980473B CN 114980473 B CN114980473 B CN 114980473B CN 202210502187 A CN202210502187 A CN 202210502187A CN 114980473 B CN114980473 B CN 114980473B
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frequency
signal
adjusting
oscillation frequency
particle accelerator
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CN114980473A (en
Inventor
王志宇
付浩然
刘巍
王旭东
余才军
高建超
谢勇
吕银龙
李明
冯雨
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Guodian Nuclear Power Technology Wuxi Technology Co ltd
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Guodian Nuclear Power Technology Wuxi Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/08—Arrangements for injecting particles into orbits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/14—Vacuum chambers
    • H05H7/16—Vacuum chambers of the waveguide type
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/14—Vacuum chambers
    • H05H7/18—Cavities; Resonators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/08—Arrangements for injecting particles into orbits
    • H05H2007/081—Sources

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)

Abstract

The invention discloses a method for adjusting parasitic oscillation frequency of a high-frequency system of a particle accelerator, which comprises the following steps: selecting a preset scanning frequency range according to the working frequency of the high power source and the accelerating cavity; the signal generator generates working frequency required by automatic detection, and the working frequency is coupled into a tested system by the directional coupler and the signal pickup; the system to be tested consists of a high power source, a feeder line and an acceleration cavity; the directional coupler is used for coupling out a forward signal and a reverse signal and sending the forward signal and the reverse signal into the AD collector; the signal processor samples through the AD collector to obtain signals, and calculates to obtain amplitude and phase information of the forward signal and the reverse signal; after the frequency traversal is completed, a threshold value is selected and used as a judgment basis; at possible resonant frequency values, determining whether the frequency is a "detrimental" oscillation frequency for f osc The resonance frequency is adjusted by adjusting a parasitic oscillation frequency device of the particle accelerator high-frequency system; after the adjustment is completed, the frequency traversal is performed again until no harmful oscillation frequency can be found.

Description

Method and device for adjusting parasitic oscillation frequency of high-frequency system of particle accelerator
Technical Field
The invention relates to the field of detection, in particular to a method and a device for adjusting parasitic oscillation frequency of a high-frequency system of a particle accelerator.
Background
In particle accelerator engineering applications, a power source in a particle accelerator system is typically used to provide the high frequency electric field required to accelerate the particles for the acceleration chamber. Typically, a transmission feeder (feeder tube, waveguide) is used between the power source and the acceleration cavity to realize power coupling feeding.
Typically, an optional directional coupler is strung between the acceleration chamber and the power source in order to monitor the actual power signal fed by the system to the acceleration chamber.
Generally, the physical dimensions of the accelerating cavity and the power source are relatively large, and from the perspective of radiation protection, the power source and the accelerating cavity are required to be arranged separately.
This determines the presence of a certain length of the transmission feed line for power transmission between the acceleration chamber and the power source. In general, the length of the transmission feeder is between several meters and several tens of meters, and the longer transmission feeder makes the whole system possible to have unnecessary parasitic oscillation frequencies, and the parasitic frequencies can have adverse effects on the stability of the whole high-frequency system under the specific length of the transmission feeder.
Disclosure of Invention
The invention aims to: a method for adjusting parasitic oscillation frequency of a high-frequency system of a particle accelerator is provided to solve the above-mentioned problems in the prior art.
The technical scheme is as follows: a method of adjusting the parasitic oscillation frequency of a high frequency system of a particle accelerator, comprising:
step 1, selecting a preset scanning frequency range according to the working frequencies of a high power source and an acceleration cavity;
step 2, the signal generator generates working frequency required by automatic detection, and the working frequency is coupled into a tested system through a directional coupler and a signal pickup; the system to be tested consists of a high power source, a feeder line and an acceleration cavity;
step 3, the directional coupler couples out a forward signal and a reverse signal and sends the forward signal and the reverse signal into the AD collector;
step 4, the signal processor samples through the AD collector to obtain signals, and the amplitude and phase information of the forward signal and the reverse signal are obtained through calculation;
step 5, after the frequency traversal is completed, selecting a threshold value as a judgment basis;
and 6, judging whether the frequency is a harmful oscillation frequency or not under the possible resonance frequency value.
In a further embodiment, in the step 1, the starting operating frequency fstart, the cut-off operating frequency fstop, and the operating frequency step δf of the signal generator are further set, and the frequency output is sequentially performed by using δf as a step, and the selection of the scanning frequency range needs to consider the operating frequency (bandwidth) and at most the third harmonic frequency of the high power source.
In a further embodiment, in the implementation step 3, when the scanning frequency is higher, a radio frequency front end is added in front of the AD acquisition for implementing frequency conversion processing of signal sampling;
the directional coupler is fed into the AD collector through forward coupling of the generated signals of the signal generator and backward coupling of the signals reflected by the whole test system.
In a further embodiment, the step 4 further includes the step of the signal processor recording a ratio relationship between the forward signal and the reverse signal of the corresponding frequency, and forming an index table at the same time;
the amplitude and phase information of the two signals are calculated in real time through the signal processor, and the resonance condition of the whole system under the current signal generator frequency can be obtained through comparing the amplitudes of the forward signal and the reverse signal;
the accelerating cavity is used as a high-frequency resonant cavity, the Q value is very high, the corresponding working bandwidth is very small, the Q value of the accelerating cavity can reach about 8000 aiming at the accelerating cavity of the cyclotron, and when the working frequency of the accelerating cavity is 70MHz, the corresponding working bandwidth of the accelerating cavity is as follows:
when the resonator is in a stable resonance state, the intrinsic quality factor Q is defined as:
where f represents the operating frequency and Δf represents the operating bandwidth;
the higher the quality factor, the smaller the bandwidth of the acceleration cavity, and for the above parameters:
the MHz magnitude is the working bandwidth of the high-frequency power source, and the high-frequency power source can also have working resonance points on harmonic frequency points, BW represents bandwidth, namely bandwidth, 70e6 represents 70×10 6 I.e. 70MHz.
In a further embodiment, the step 5 further includes setting the reverse signal to Pr, the forward signal to Pf, and selecting the threshold to threshold;
when (when)Indicating that there may be a resonant frequency of the system under test at that frequency point;
when (when)Indicating that the system under test has no resonant frequency at the frequency point;
when the reverse/forward signal is greater than the threshold, it indicates that there is no resonant frequency of the system under test at that frequency point.
In a further embodiment, the frequency is determined to be a "harmful" oscillation frequency at a possible resonant frequency value, where the resonant frequency value is f re onant ；
When (when)Or f re onant The second or third working frequency of the high power source is approximately equal to the harmful oscillation frequency; is provided with a harmful oscillation frequency f o c 。
In a further embodiment, the method further comprises a step 7, aiming at f o c The resonance frequency is adjusted by adjusting a parasitic oscillation frequency device of the particle accelerator high-frequency system;
during the movement process of the device for adjusting the parasitic oscillation frequency of the particle accelerator high-frequency system, the resonance frequency of the frequency is continuously measured, after the length of the feeder line is changed, the resonance frequency of the measured system is changed, and the new resonance frequency is moved out of the range of the harmful oscillation frequency;
after the adjustment is completed, the frequency traversal is performed again until no harmful oscillation frequency can be found.
An apparatus for adjusting parasitic oscillation frequency of a high frequency system of a particle accelerator, comprising:
an adjusting part connected with the feeder line;
the adjusting part is a variable length phase shifter;
the feeder comprises a fixed branch pipe and a movable branch pipe;
the fixed branch pipe is characterized by comprising an outer pipe and an inner pipe arranged in the outer pipe;
the movable branch pipe comprises a movable outer pipe and a movable inner pipe arranged in the movable outer pipe; fixing lugs are arranged on two sides of the movable outer guide pipe;
the outer conduit is sleeved with the movable outer conduit, and the inner conduit is sleeved with the movable inner conduit;
an adaptive conduction piece is arranged between the outer guide pipe and the movable outer guide pipe and between the inner guide pipe and the movable inner guide pipe;
the adaptive conduction piece comprises a conduction seat fixedly connected with the external conduit and the internal conduit, and a conduction ball embedded in the conduction seat;
at least one half of the conducting ball is embedded in the conducting seat;
through the design of the conducting seat and the conducting ball, the device can be used as a lubricating mechanism and a reliable point contact mechanism.
In a further embodiment, the variable length phase shifter comprises a transversal phase shifter and a vertical phase shifter;
the transverse phase shifter comprises a bottom plate, fixing frames fixedly arranged on two sides of the bottom plate, a driving screw rod and a guide rod which are arranged on the fixing frames, and a moving frame sleeved on the driving screw rod and the guide rod;
a driving wheel is sleeved at the end part of the driving screw rod, and a driving belt is arranged between the driving wheels;
the other end of any driving screw rod is provided with a driving motor, the output end of the driving motor is provided with a driving input shaft, and the driving input shaft and the driving screw rod coaxially rotate;
the fixed lugs are connected with the movable frame;
when the feeder is placed in a transverse state, the transverse phase shifter can be adopted, the fixed lug is fixed on the movable frame, the driving motor drives the driving input shaft to rotate, the driving screw rod is driven to rotate, the movable outer guide tube and the movable inner guide tube are driven to be inserted into the outer guide tube and the inner guide tube, and in the inserting process, the guide tube is used as a lubricating mechanism by the conducting ball, so that the distance changing process is smoother.
In a further embodiment, the vertical phase shifter comprises a fixed plate, a lifting motor, a lifting rotating shaft, a first rotating wheel, a second rotating wheel, a first guide wheel and a second guide wheel, wherein the lifting motor is installed on the fixed plate, the lifting rotating shaft is arranged at the output end of the lifting motor, the first rotating wheel and the second rotating wheel are sleeved on the lifting rotating shaft, the first guide wheel and the second guide wheel are arranged at two sides of the fixed plate, a first cable which is wound on the first rotating wheel and is connected with a fixed lug at one side of a movable outer guide pipe by bypassing the first guide wheel, and a second cable which is wound on the second rotating wheel and is connected with a fixed lug at the other side of the movable outer guide pipe by bypassing the second guide wheel; the winding directions of the first cable and the second cable on the first guide wheel and the second guide wheel are opposite;
the fixed plate is preinstalled on the fixed branch pipe.
When the feeder is placed in a vertical state, the vertical phase shifter can be selected to complete adjustment of the feeder, firstly, the lifting motor drives the lifting rotating shaft to rotate, then the first rotating wheel and the second rotating wheel are driven to rotate, the first cable and the second cable are wound by the second changing wheel of the first rotating wheel, then the movable outer guide pipe and the movable inner guide pipe are driven to be inserted into the outer guide pipe and the inner guide pipe, and in the inserting process, the conducting ball is used as a lubricating mechanism, so that the distance changing process is smoother.
The beneficial effects are that: the invention discloses a method for adjusting parasitic oscillation frequency of a high-frequency system of a particle accelerator, which can improve the stability of the whole accelerator high-frequency system by designing a method, firstly selecting a preset scanning frequency range according to the working frequency of a high-power source and an accelerating cavity, then generating the working frequency required by automatic detection by a signal generator, coupling the working frequency into a tested system by a directional coupler and a signal pickup, coupling forward signals and reverse signals by the directional coupler, sending the forward signals and the reverse signals into an AD collector, sampling by the signal processor through the AD collector to obtain signals, obtaining amplitude and phase information of the forward signals and the reverse signals through calculation, selecting a threshold value as a judging basis after frequency traversal is completed, judging whether the frequency is a harmful oscillation frequency or not under possible resonant frequency values, and then adjusting the distance of a feeder line according to judging information, thereby avoiding the problem of system equipment damage caused by the parasitic frequency.
Drawings
FIG. 1 is a schematic of the process workflow of the present invention.
Fig. 2 is a block diagram of the hardware of the invented method.
Fig. 3 is a schematic diagram of an inventive signal generation collector.
Fig. 4 is a block diagram schematic of a prior art method hardware.
Fig. 5 is a schematic diagram of an inventive transversal phase shifter.
Fig. 6 is a schematic diagram of an inventive vertical phase shifter.
Fig. 7 is a schematic diagram of an inventive via.
The reference numerals are: 11. a bottom plate; 12. a moving rack; 13. driving a screw rod; 14. a guide rod; 15. a fixing frame; 21. a lifting motor; 22. a first wheel; 23. a second wheel; 24. the first guide wheel; 25. a fixing plate; 26. the second guide wheel; 27. a first cable; 28. a second cable; 31. fixing the branch pipes; 311. an external conduit; 312. a conduction seat; 313. a conductive ball; 32. moving the outer catheter; 33. a fixed ear; 34. the inner catheter is moved.
Detailed Description
The present invention relates to a method and apparatus for adjusting the parasitic oscillation frequency of a high frequency system of a particle accelerator, and is explained below by way of specific embodiments.
An apparatus for adjusting parasitic oscillation frequency of a high frequency system of a particle accelerator comprises: an adjusting part connected with the feeder line;
the feeder comprises a fixed branch pipe 31 and a movable branch pipe;
wherein the fixed branch pipe 31 comprises an outer conduit 311, and an inner conduit arranged in the outer conduit 311;
the mobile branch pipe comprises a mobile outer guide pipe 32 and a mobile inner guide pipe 34 arranged in the mobile outer guide pipe 32; the two sides of the movable outer guide pipe 32 are provided with fixed lugs 33;
the outer conduit 311 is sleeved with the movable outer conduit 32, and the inner conduit is sleeved with the movable inner conduit 34;
an adapting conduction piece is arranged between the outer conduit 311 and the movable outer conduit 32 and between the inner conduit and the movable inner conduit 34;
the adapting conduction member comprises a conduction seat 312 fixedly connected with the external conduit 311 and the internal conduit, and a conduction ball 313 embedded in the conduction seat 312;
at least a half of the conductive ball 313 is embedded in the conductive socket 312;
by designing the conduction seat 312 and the conduction ball 313, the device can be used not only as a lubrication mechanism but also as a point contact mechanism with reliability.
The adjusting part comprises a transverse phase shifter;
the transverse phase shifter comprises a bottom plate 11, fixing frames 15 fixedly arranged on two sides of the bottom plate 11, a driving screw rod 13 and a guide rod 14 which are arranged on the fixing frames 15, and a movable frame 12 sleeved on the driving screw rod 13 and the guide rod 14;
a driving wheel is sleeved at the end part of the driving screw rod 13, and a driving belt is arranged between the driving wheels;
the other end of any driving screw rod 13 is provided with a driving motor, the output end of the driving motor is provided with a driving input shaft, and the driving input shaft and the driving screw rod 13 coaxially rotate;
the fixed lugs 33 are connected with the movable frame 12;
when the feeder line is placed in a horizontal state, a horizontal phase shifter can be adopted at this time, the fixed lug 33 is fixed on the movable frame 12, the driving motor drives the driving input shaft to rotate, and then drives the driving screw rod 13 to rotate, and further drives the movable outer guide tube 32 and the movable inner guide tube 34 to be inserted into the outer guide tube 311 and the inner guide tube, and in the inserting process, the conducting ball 313 is used as a lubricating mechanism, so that the distance changing process is smoother.
The adjusting part comprises a vertical phase shifter;
the vertical phase shifter comprises a fixed plate 25, a lifting motor 21 arranged on the fixed plate 25, a lifting rotating shaft arranged at the output end of the lifting motor 21, a first rotating wheel 22 and a second rotating wheel 23 sleeved on the lifting rotating shaft, a first guide wheel 24 and a second guide wheel 26 arranged at two sides of the fixed plate 25, a first cable 27 wound on the first rotating wheel 22 and bypassing the first guide wheel 24 to be connected with a fixed lug 33 at one side of a movable outer guide pipe 32, and a second cable 28 wound on the second rotating wheel 23 and bypassing the second guide wheel 26 to be connected with a fixed lug 33 at the other side of the movable outer guide pipe 32; the winding directions of the first cable 27 and the second cable 28 on the first guide wheel 24 and the second guide wheel 26 are opposite;
the fixing plate 25 is pre-installed on the fixing sub-pipe 31.
When the feeder line is placed in a vertical state, the vertical phase shifter can be selected to complete adjustment of the feeder line, firstly, the lifting motor 21 drives the lifting rotating shaft to rotate, then the first rotating wheel 22 and the second rotating wheel 23 are driven to rotate, the first cable 27 and the second cable 28 are wound by the second changing wheel of the first rotating wheel 22, then the movable outer guide pipe 32 and the movable inner guide pipe 34 are driven to be inserted into the outer guide pipe 311 and the inner guide pipe, and in the inserting process, the conducting ball 313 is used as a lubricating mechanism, so that the distance changing process is smoother.
A method of adjusting the parasitic oscillation frequency of a high frequency system of a particle accelerator, comprising:
step 1, selecting a preset scanning frequency range according to the working frequencies of a high power source and an acceleration cavity;
setting an initial working frequency fstart, a cut-off working frequency fstop and a working frequency step δf of the signal generator, taking δf as a step, and sequentially carrying out frequency output, wherein the selection of a scanning frequency range needs to consider the working frequency and the maximum third harmonic frequency of a high-power source.
Step 2, the signal generator generates working frequency required by automatic detection, and the working frequency is coupled into a tested system through a directional coupler and a signal pickup; the system to be tested consists of a high power source, a feeder line and an acceleration cavity;
step 3, the directional coupler couples out a forward signal and a reverse signal and sends the forward signal and the reverse signal into the AD collector;
when the scanning frequency is higher, a radio frequency front end is added in front of AD acquisition for realizing frequency conversion processing of signal sampling;
the directional coupler is fed into the AD collector through forward coupling of the generated signals of the signal generator and backward coupling of the signals reflected by the whole test system.
Step 4, the signal processor samples through the AD collector to obtain signals, and the amplitude and phase information of the forward signal and the reverse signal are obtained through calculation;
the signal processor records the ratio relation between the forward signal and the reverse signal of the corresponding frequency and forms an index table at the same time;
the amplitude and phase information of the two signals are calculated in real time through the signal processor, and the resonance condition of the whole system under the current signal generator frequency can be obtained through comparing the amplitudes of the forward signal and the reverse signal;
the accelerating cavity is used as a high-frequency resonant cavity, the Q value is very high, the corresponding working bandwidth is very small, the Q value of the accelerating cavity can reach about 8000 aiming at the accelerating cavity of the cyclotron, and when the working frequency of the accelerating cavity is 70MHz, the corresponding working bandwidth of the accelerating cavity is as follows:
when the resonator is in a stable resonance state, the intrinsic quality factor Q is defined as:
where f represents the operating frequency and Δf represents the operating bandwidth;
the higher the quality factor, the smaller the bandwidth of the acceleration cavity, and for the above parameters:
the MHz magnitude is the working bandwidth of the high-frequency power source, and the high-frequency power source can also have working resonance points on harmonic frequency points, BW represents bandwidth, namely bandwidth, 70e6 represents 70×10 6 I.e. 70MHz.
Step 5, after the frequency traversal is completed, selecting a threshold value as a judgment basis;
setting a reverse signal as Pr, a forward signal as Pf, and selecting a threshold value as threshold;
when (when)Indicating that there may be a resonant frequency of the system under test at that frequency point;
when (when)Indicating that the system under test has no resonant frequency at the frequency point;
when the reverse/forward signal is greater than the threshold, it indicates that there is no resonant frequency of the system under test at that frequency point.
And 6, judging whether the frequency is a harmful oscillation frequency or not under the possible resonance frequency value.
Judging whether the frequency is a harmful oscillation frequency or not under the possible resonance frequency value, and setting the resonance frequency value as f re onant ；
When (when)Or f re onant The second or third working frequency of the high power source is approximately equal to the harmful oscillation frequency; is provided with a harmful oscillation frequency f o c 。
Step 7, for f o c The resonance frequency is adjusted by adjusting a parasitic oscillation frequency device of the particle accelerator high-frequency system;
during the movement process of the device for adjusting the parasitic oscillation frequency of the particle accelerator high-frequency system, the resonance frequency of the frequency is continuously measured, after the length of the feeder line is changed, the resonance frequency of the measured system is changed, and the new resonance frequency is moved out of the range of the harmful oscillation frequency;
after the adjustment is completed, the frequency traversal is performed again until no harmful oscillation frequency can be found.
The feeder length changing method has two states;
lateral state: the fixed lug 33 is fixed on the movable frame 12 by adopting the transverse phase shifter, the driving motor drives the driving input shaft to rotate, and then drives the driving screw rod 13 to rotate, and further drives the movable outer guide pipe 32 and the movable inner guide pipe 34 to be inserted into the outer guide pipe 311 and the inner guide pipe, and in the inserting process, the conducting ball 313 is used as a lubricating mechanism, so that the distance changing process is smoother.
Vertical state: the vertical phase shifter is adopted, the lifting motor 21 drives the lifting rotating shaft to rotate, the first rotating wheel 22 and the second rotating wheel 23 are driven to rotate, the first cable 27 and the second cable 28 are wound by the first rotating wheel 22 and the second rotating wheel, the movable outer guide pipe 32 and the movable inner guide pipe 34 are driven to be inserted into the outer guide pipe 311 and the inner guide pipe, and in the inserting process, the conducting ball 313 is used as a lubricating mechanism, so that the distance changing process is smoother.
Description of working principle: selecting a preset scanning frequency range according to the working frequency of the high power source and the accelerating cavity; the signal generator generates working frequency required by automatic detection, and the working frequency is coupled into a tested system by the directional coupler and the signal pickup; the system to be tested consists of a high power source, a feeder line and an acceleration cavity; the directional coupler is used for coupling out a forward signal and a reverse signal and sending the forward signal and the reverse signal into the AD collector; the signal processor samples through the AD collector to obtain signals, and calculates to obtain amplitude and phase information of the forward signal and the reverse signal; after the frequency traversal is completed, a threshold value is selected and used as a judgment basis; at possible resonant frequency values, determining whether the frequency is a "detrimental" oscillation frequency for f o c The resonance frequency is adjusted by adjusting a parasitic oscillation frequency device of the particle accelerator high-frequency system; after the adjustment is completed, the frequency traversal is performed again until no harmful oscillation frequency can be found.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and these equivalent changes all fall within the scope of the present invention.

Claims (7)

1. A method for adjusting the parasitic oscillation frequency of a high frequency system of a particle accelerator, comprising:
step 1, selecting a preset scanning frequency range according to the working frequencies of a high power source and an acceleration cavity;
step 2, the signal generator generates working frequency required by automatic detection, and the working frequency is coupled into a tested system through a directional coupler and a signal pickup; the tested system consists of a high power source, a feeder line and an acceleration cavity;
step 3, the directional coupler couples out a forward signal and a reverse signal and sends the forward signal and the reverse signal into the AD collector;
step 4, the signal processor samples through the AD collector to obtain signals, and the amplitude and phase information of the forward signal and the reverse signal are obtained through calculation;
step 5, after the frequency traversal is completed, selecting a threshold value as a judgment basis;
step 6, judging whether the frequency is a harmful oscillation frequency or not under the possible resonance frequency value;
let the resonant frequency value be f resonant ；
When (when)Or f resonant The secondary or tertiary working frequency of the high power source is judged to be harmful oscillation frequency;
is provided with a harmful oscillation frequency f osc ；
Step 7, for f osc The resonance frequency is adjusted by adjusting a parasitic oscillation frequency device of the particle accelerator high-frequency system;
during the movement process of the device for adjusting the parasitic oscillation frequency of the particle accelerator high-frequency system, the resonance frequency of the frequency is continuously measured, after the length of the feeder line is changed, the resonance frequency of the measured system is changed, and the new resonance frequency is moved out of the range of the harmful oscillation frequency;
after the adjustment is completed, frequency traversal is performed again until harmful oscillation frequency cannot be found;
the device for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator comprises:
an adjusting part connected with the feeder line;
the feeder comprises a fixed branch pipe (31) and a movable branch pipe;
the fixed branch pipe (31) comprises an outer conduit (311), an inner conduit arranged in the outer conduit (311);
the mobile branch pipe comprises a mobile outer guide pipe (32), and a mobile inner guide pipe (34) arranged in the mobile outer guide pipe (32); both sides of the movable outer guide pipe (32) are provided with fixed lugs (33);
the outer conduit (311) is sleeved with a movable outer conduit (32), and the inner conduit is sleeved with a movable inner conduit (34);
an adapting conduction piece is arranged between the outer conduit (311) and the movable outer conduit (32) and between the inner conduit and the movable inner conduit (34);
the adaptive conduction piece comprises a conduction seat (312) fixedly connected with the external conduit (311) and the internal conduit, and a conduction ball (313) embedded in the conduction seat (312);
at least a half of the conductive ball (313) is embedded in the conductive socket (312).
2. The method for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator according to claim 1, wherein the method comprises the following steps: in the step 1, an initial operating frequency fstart, a cut-off operating frequency fstop and an operating frequency step δf of the signal generator are set, the δf is used as a step to sequentially perform frequency output, and the operating frequency and the multiple third harmonic frequency of the high power source are considered for selecting the scanning frequency range.
3. The method for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator according to claim 1, wherein the method comprises the following steps: in the implementation step 3, when the scanning frequency is higher, a radio frequency front end is added in front of AD acquisition for realizing frequency conversion processing of signal sampling;
the directional coupler is fed into the AD collector through forward coupling of the generated signals of the signal generator and backward coupling of the signals reflected by the whole test system.
4. The method for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator according to claim 1, wherein the method comprises the following steps: the step 4 also comprises the step that the signal processor records the ratio relation between the forward signal and the reverse signal of the corresponding frequency and forms an index table at the same time;
the amplitude and phase information of the two signals are calculated in real time through a signal processor, and the resonance condition of the whole system under the current signal generator frequency is obtained through comparing the amplitudes of the forward signal and the reverse signal;
the accelerating cavity is used as a high-frequency resonant cavity, the Q value is very high, the corresponding working bandwidth is very small, the Q value of the accelerating cavity can reach about 8000 aiming at the accelerating cavity of the cyclotron, and when the working frequency of the accelerating cavity is 70MHz, the corresponding working bandwidth of the accelerating cavity is as follows:
when the resonator is in a stable resonance state, the intrinsic quality factor Q is defined as:
where f represents the operating frequency and Δf represents the operating bandwidth;
the higher the quality factor, the smaller the bandwidth of the acceleration cavity, and for the above parameters:
the MHz order of the operating bandwidth of the high-frequency power source, and the high-frequency power source may have an operating resonance point at the harmonic frequency point, wherein 70e6 represents 70×10 6 I.e. 70mhz, bw indicates the bandwidth.
5. The method for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator according to claim 1, wherein the method comprises the following steps: step 5 further includes setting a reverse signal to be Pr, setting a forward signal to be Pf, and selecting a threshold to be threshold;
when (when)Indicating that there may be a resonant frequency of the system under test at that frequency point;
when (when)Indicating that there is no resonant frequency of the system under test at that frequency point.
6. The method for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator according to claim 1, wherein the method comprises the following steps: the adjusting part comprises a transverse phase shifter;
the transverse phase shifter comprises a bottom plate (11), fixing frames (15) fixedly arranged on two sides of the bottom plate (11), a driving screw rod (13) and a guide rod (14) which are arranged on the fixing frames (15), and a movable frame (12) sleeved on the driving screw rod (13) and the guide rod (14);
a driving wheel is sleeved at the end part of the driving screw rod (13), and a driving belt is arranged between the driving wheels;
the other end of any driving screw rod (13) is provided with a driving motor, the output end of the driving motor is provided with a driving input shaft, and the driving input shaft and the driving screw rod (13) coaxially rotate;
the fixed lugs (33) are connected with the movable frame (12).
7. The method for adjusting the parasitic oscillation frequency of the high-frequency system of the particle accelerator according to claim 1, wherein the method comprises the following steps: the adjusting part comprises a vertical phase shifter;
the vertical phase shifter comprises a fixed plate (25), a lifting motor (21) arranged on the fixed plate (25), a lifting rotating shaft arranged at the output end of the lifting motor (21), a first rotating wheel (22) and a second rotating wheel (23) sleeved on the lifting rotating shaft, a first guide wheel (24) and a second guide wheel (26) arranged on two sides of the fixed plate (25), a first cable (27) wound on the first rotating wheel (22) and bypassing the first guide wheel (24) to connect a fixed lug (33) on one side of a movable outer guide pipe (32), and a second cable (28) wound on the second rotating wheel (23) and bypassing the second guide wheel (26) to connect a fixed lug (33) on the other side of the movable outer guide pipe (32); the winding directions of the first cable (27) and the second cable (28) on the first guide wheel (24) and the second guide wheel (26) are opposite;
the fixing plate (25) is pre-installed on the fixing branch pipe (31).
CN202210502187.XA 2022-05-10 2022-05-10 Method and device for adjusting parasitic oscillation frequency of high-frequency system of particle accelerator Active CN114980473B (en)

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