CN106535461A - Medical superconducting cyclotron resonant cavity capacitor tuning device and method - Google Patents
Medical superconducting cyclotron resonant cavity capacitor tuning device and method Download PDFInfo
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- CN106535461A CN106535461A CN201610992494.5A CN201610992494A CN106535461A CN 106535461 A CN106535461 A CN 106535461A CN 201610992494 A CN201610992494 A CN 201610992494A CN 106535461 A CN106535461 A CN 106535461A
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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
- H05H13/00—Magnetic resonance accelerators; Cyclotrons
- H05H13/005—Cyclotrons
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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
- H05H7/14—Vacuum chambers
- H05H7/18—Cavities; Resonators
- H05H7/20—Cavities; Resonators with superconductive walls
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Abstract
The invention discloses a medical superconducting cyclotron resonant cavity capacitor tuning device and method. The device comprises a cavity and two sets of DEE plates arranged end to end in the cavity. Upper and lower sides of each set of DEE plates are respectively vertically connected with an inner rod. A tuning structure which moves relative to an end face of each Dee plate is arranged in the cavity. The tuning structure consists of a tuning capacitor plate and a moving rod. The tuning method comprises the steps that a vector network analyzer is used to adjust the resonant frequency; the reflection coefficient S11 is measured; the frequency point f1 corresponding to the minimum S11 is observed; f1 and the resonant frequency f0 are compared; if f1 is greater than f0, the capacitor plate is slowly moved to the left, otherwise the capacitor plate is slowly moved to the right; the change of the frequency point corresponding to the minimum S11 is observed; and if f1 is equal to f0, the moving of the capacitor plate is stopped to reach the frequency point of the working resonant cavity. According to the invention, automatically cavity frequency adjusting is realized; and the equivalent capacitance of a resonant circuit is changed by automatically controlling the capacitor plate to move to the right and left and tune the resonant cavity.
Description
Technical field
The invention belongs to superconducting cyclotron technical field, is related to a kind of medical superconducting cyclotron resonator electric capacity
Tuner and method.
Background technology
Cyclotron is not only widely used in the basic scientific research such as nuclear physics, particle and solid-state physics field, while
Occupy critical role in applications such as the diagnosis of medical science PET, proton therapeutic, Isotope production and industrial irradiations.Construction possesses certainly
The medical cyclotron of main intellectual property, and it is imperative to make which smoothly put into operation.
When medical superconducting cyclotron cavity is designed, the requirement of resonant frequency should be met first, because accelerator
Operating frequency it is single, it requires that cavity frequency selectivity is precipitous, but, in order to coordinate the operating frequency of magnet, it is desirable to chamber
The frequency of body is adjustable in a certain scope, that is, require that resonance point has several million scope adjustable, and this is accomplished by effective frequency and adjusts machine
Structure.But due to accelerator under normal operating conditions, there is fuel factor in radio system so that cavity resonant frequency is in thermal balance
Occurs relatively large deviation before and after process, the presence of the deviation causes not being inconsistent with Theoretical Design value, it is impossible to realize the correct acceleration of line
And draw.Therefore, when resonator is designed, frequency regulation arrangement will be in dynamic tuning state, by mobile fine setting electricity in real time
Hold plate to compensate the frequency drift that fuel factor causes.
The content of the invention
It is an object of the invention to provide a kind of medical superconducting cyclotron resonator capacitance tuning device and method, uses
In resonator frequency is adjusted, resonator is made to be operated in resonant condition；By changing the spacing between trimmer and ground, change fine setting
The capacitance of electric capacity is realizing the regulation of resonator frequency.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of medical superconducting cyclotron resonator capacitance tuning device, the device include cavity and are arranged on chamber
Two groups of DEE plates that internal and end is oppositely arranged with end；The upper and lower both sides of per group of DEE plate are respectively perpendicular one interior bar of connection；Institute
The tuning structure being provided with cavity relative to each Dee plates end face movement is stated, the tuning structure is by tuning capacitance plate and movement
Bar is constituted.
Each described tuning structure is made up of tuning capacitance plate and mobile bar, and the tuning capacitance plate is made up of metallic copper,
Described mobile bar one end is connected with capacitor board, and the other end passes through chamber outer wall and magnet to be connected with motor, with the interior bar
Feedback probe is connected on relative cavity.
The capacitance tuning device is respectively distributed to the midplane of left and right cavity, and adopts symmetrical structure, the interior bar,
Tuning capacitance plate, mobile bar are located in one single-chamber body of resonator.
The mobile bar other end is connected with motor, and the feedback probe is connected with cavity, radio frequency in test chamber
Signal, controls motor regulation mobile bar and moves left and right for feeding back to control system.
The feedback probe is distributed on left and right cavity, feedback signal is processed by control system, obtains cavity
Off resonance information and left and right cavity tuning capacitance plate positional information.
The capacitor board is connected with mobile bar, and mobile bar one end is Motor drive port, according to position signalling and control
Signal drives mobile bar to move left and right, and adjusts on the outside of Dee plates electric capacity and outer chamber wall between to realize tuning.
Tuning structure in the single-chamber body, capacitor board pass through the left and right movement of mobile bar, by the resonance for changing resonator
In loop, capacitance is adjusting cavity frequency.
A kind of medical superconducting cyclotron resonator capacitive tuning method, the tuning methods comprise the steps：
1) analyzed according to resonator physical Design, calculate the size and installation site of capacitor board, and chamber outer wall and
Magnet bore size；
2) mobile bar one end is connected with capacitor board, the other end passes through chamber outer wall and magnet to be placed on the position of calculating,
And be connected with motor；
3) resonant frequency is adjusted using vector network analyzer, one end of vector network analyzer is connected on feeder line input, survey
Amount reflectance factor S11, observe S11The corresponding Frequency point f of minimum of a value1, by f1With resonant frequency f0Contrast, if f1>f0, slowly to the left
Mobile capacitor board, conversely, the capacitor board that then moves right, while observing S11The change of minimum of a value respective frequencies point；Work as f1=f0When,
Stop mobile capacitor board, reach the Frequency point of resonator work.
Step 2) in, the tuning capacitance plate is placed on cavity midplane, with Dee plates on the outside of formed a tunable capacitor；
Tuning capacitance plate is connected with one end of mobile bar, and the mobile bar other end is connected with motor, is moved left and right by motor
Tuning capacitance plate, for the size of capacitance in resonant tank, changes frequency so that accelerating cavity reaches resonant condition；The chamber
In vivo by radiofrequency signal in feedback probe test chamber, mobile bar is automatically adjusted for feeding back to control system and carrying out motor
Move left and right.
Beneficial effects of the present invention：
1) present invention realizes the regulation of frequency, tuning knot using left and right mobile tuning structure is carried out in cavity midplane
Structure is separated with coupled structure, can be reduced cavity sparking possibility, be run cavity more stable.
2) present invention is by automatically controlling the moving left and right come regulating frequency of capacitor board, it is to avoid accelerator cavity off resonance, and
Experience adjustments of the manual tuning by operating personnel are solved, the longer shortcoming of regulating time realizes the function of automatic tuning；
Description of the drawings
For the ease of it will be appreciated by those skilled in the art that the present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is medical superconducting cyclotron resonator capacitance tuning device (single-chamber) structural representation of the invention；
In figure：1- superconducting magnets；2- cavitys；3- interior bars；4-Dee plates；5- tuning capacitance plates；6- mobile bars；7- probes.
Specific embodiment
Technical scheme is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Apply example only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is general
All other embodiment that logical technical staff is obtained under the premise of creative work is not made, belongs to present invention protection
Scope.
Medical superconducting cyclotron resonator capacitance tuning device, the left and right both sides of the tuner are using completely right
The structure of title, single cavity structure is referring to Fig. 1, including the Dee plates 4 that end is oppositely arranged with end, and 4 rear portion of Dee plates is placed with tuning capacitance
Plate 5；4 upper and lower both sides of Dee plates are respectively perpendicular one interior bar 3 of connection；
Wherein, interior bar 3, Dee plates 4 are may be contained within one single-chamber body of resonator with tuning structure, and the section of the resonator is in
Left and right two symmetrical cross-type shapes；
The capacitance tuning device is respectively distributed to the midplane of left and right cavity, and adopts symmetrical structure, by tuning capacitance
Plate 5 is constituted with mobile bar 6；Wherein, 6 one end of mobile bar is connected on tuning capacitance plate 5；
The other end of above-mentioned mobile bar 6 passes through 2 outer wall of cavity and superconducting magnet 1 to be connected with drive mechanism, the drive mechanism
For motor；Feedback probe 7 is connected with cavity 2；
Radiofrequency signal in 7 test chamber of above-mentioned feedback probe, transmission line pass through chamber outer wall and superconducting magnet that signal is anti-
Control system of feeding is carried out motor and automatically adjusts mobile bar to move left and right, and adjusts the electric capacity and outer chamber wall between on the outside of Dee plates
To realize tuning；
Referring to Fig. 1, medical superconducting cyclotron resonator capacitive tuning method, the method include：By tuning capacitance plate 5
Be placed on cavity midplane, with Dee plates 4 on the outside of formed a tunable capacitor；Tuning capacitance plate 5 is connected with one end of mobile bar 6,
6 other end of mobile bar is connected with drive mechanism；Tuner using moving left and right structure, in resonant tank capacitance it is big
It is little, change frequency so that accelerating cavity reaches resonant condition；Feedback probe 7 is connected with cavity, radiofrequency signal in test chamber, is used
Carry out motor and automatically adjust mobile bar to move left and right in control system is fed back to.
When cavity because when fuel factor produces deformation, being analyzed with Cavity perturbation.Lower relation can be able to by Theory of Electromagnetic Field：
In above formula, ω is the resonant frequency after perturbation, ω0For the resonant frequency before perturbation,It is average electric field energy
Metric density and average magnetic energy density；Δ ν is Volume Changes,For the average electromagnetic energy of resonance cavity total after perturbation.
If equivalent capacity is C in resonant tank, equivalent inductance is L.The resonant frequency that loop can be obtained is expressed as：
Tuning capacitance plate changes the spacing between capacitor board and ground, that is, the electric capacity for changing electric capacity by moving left and right
Amount, causes equivalent capacity C of resonator to change, so that frequency occurs corresponding change in cavity.Therefore adopt
Capacitance value makes accelerating cavity be constantly in resonant condition come the method for compensating the frequency shift (FS) caused due to fuel factor.
The Implement methodology of the present invention is mainly as follows：
1) analyzed according to resonator physical Design, calculated outside the size and installation site, and cavity of tuning capacitance plate 5
Wall and magnet bore size；
2) mobile bar one end is connected with capacitor board, the other end passes through chamber outer wall and magnet to be placed on the position of calculating,
And be connected with motor；
3) resonant frequency is adjusted using vector network analyzer, one end of vector network analyzer is connected on feeder line input, survey
Amount reflectance factor S11, observe S11The corresponding Frequency point f of minimum of a value1, by f1With resonant frequency f0Contrast, if f1>f0, slowly to the left
Mobile capacitor board, conversely, the capacitor board that then moves right, while observing S11The change of minimum of a value respective frequencies point；Work as f1=f0When,
Stop mobile capacitor board, reach the Frequency point of resonator work.
4) electric capacity Board position is automatically adjusted by feedback control, it is to avoid as the intra-cavity frequency change that fuel factor causes causes
The phenomenon of cavity off resonance.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed
All of details is described, it is only described specific embodiment also not limit the invention.Obviously, the content according to this specification,
Can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to preferably explain the present invention
Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and its four corner and equivalent.
Claims (8)
1. medical superconducting cyclotron resonator capacitance tuning device, it is characterised in that the device includes cavity and arranges
In cavity and hold and two groups of DEE plates being oppositely arranged of end；The upper and lower both sides of per group of DEE plate are respectively perpendicular in connection one
Bar；Be provided with the tuning structure relative to the movement of each Dee plates end face in the cavity, the tuning structure by tuning capacitance plate and
Mobile bar is constituted.
2. medical superconducting cyclotron resonator capacitance tuning device according to claim 1, it is characterised in that described
Tuning capacitance plate is made up of metallic copper, and described mobile bar one end is connected with tuning capacitance plate, and the other end passes through chamber outer wall and surpasses
Magnetic conductor is connected with motor；Feedback probe is connected on the cavity relative with the interior bar.
3. medical superconducting cyclotron resonator capacitance tuning device according to claim 1, it is characterised in that described
Tuner is respectively distributed to the midplane of left and right cavity, and adopts symmetrical structure, the interior bar, tuning capacitance plate, movement
Bar is located in one single-chamber body of resonator.
4. medical superconducting cyclotron resonator capacitance tuning device according to claim 2, it is characterised in that described
Feedback probe is connected with cavity, radiofrequency signal in test chamber, motor is controlled for feeding back to control system and adjusts shifting
Lever is moved left and right.
5. medical superconducting cyclotron resonator capacitance tuning device according to claim 4, it is characterised in that described
Feedback probe is distributed on left and right cavity, feedback signal is processed by control system, obtain cavity off resonance information and
The positional information of left and right cavity tuning capacitance plate.
6. medical superconducting cyclotron resonator capacitance tuning device according to claim 5, it is characterised in that described
Tuning capacitance plate is connected with mobile bar, and mobile bar one end is Motor drive port, is driven according to position signalling and control signal
Mobile bar is moved left and right, and adjusts on the outside of Dee plates electric capacity and outer chamber wall between to realize tuning.
7. medical superconducting cyclotron resonator capacitive tuning method, it is characterised in that the tuning methods comprise the steps：
1) analyzed according to resonator physical Design, calculate the size and installation site of tuning capacitance plate, and chamber outer wall and
Magnet bore size；
2) mobile bar one end is connected with tuning capacitance plate, the other end passes through chamber outer wall and magnet to be placed on the position of calculating,
And be connected with motor；
3) resonant frequency is adjusted using vector network analyzer, one end of vector network analyzer is connected on feeder line input, and measurement is anti-
Penetrate coefficient S11, observe S11The corresponding Frequency point f of minimum of a value1, by f1With resonant frequency f0Contrast, if f1>f0, slowly it is moved to the left
Capacitor board, conversely, the capacitor board that then moves right, while observing S11The change of minimum of a value respective frequencies point；Work as f1=f0When, stop
Mobile capacitor board, reaches the Frequency point of resonator work.
8. medical superconducting cyclotron resonator capacitive tuning method according to claim 7, it is characterised in that step
2), in, the tuning capacitance plate is placed on cavity midplane, with Dee plates on the outside of formed a tunable capacitor；Tuning capacitance plate with
One end of mobile bar is connected, and the mobile bar other end is connected with motor, moves left and right tuning capacitance plate by motor, uses
The size of capacitance in resonant tank, changes frequency so that accelerating cavity reaches resonant condition；By feeding back spy in the cavity
Radiofrequency signal in head test chamber, carrys out motor and automatically adjusts mobile bar to move left and right for feeding back to control system.
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| CN201610992494.5A CN106535461B (en) | 2016-11-11 | 2016-11-11 | Medical superconducting cyclotron resonator capacitance tuning device and method |
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| CN201610992494.5A CN106535461B (en) | 2016-11-11 | 2016-11-11 | Medical superconducting cyclotron resonator capacitance tuning device and method |
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Cited By (7)
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| CN107889337A (en) * | 2017-12-13 | 2018-04-06 | 合肥中科离子医学技术装备有限公司 | A kind of superconducting cyclotron T-shaped inner wire spiral shape resonator |
| CN108024438A (en) * | 2017-12-13 | 2018-05-11 | 合肥中科离子医学技术装备有限公司 | One kind is used for superconducting cyclotron RF resonator c-type electric connection structures |
| CN108449860A (en) * | 2018-03-05 | 2018-08-24 | 中国科学院高能物理研究所 | A kind of low temperature inserted link tuner and superconductor cavity |
| WO2019100858A1 (en) * | 2017-11-23 | 2019-05-31 | 合肥中科离子医学技术装备有限公司 | Method for conducting cold-cavity test on accelerating voltage of cyclotron by using equivalent parallel impedance |
| CN109862685A (en) * | 2019-03-11 | 2019-06-07 | 王飞 | A kind of high frequency cavity and its adjusting method with real-time, tunable formula capacitor |
| CN110213878A (en) * | 2019-05-29 | 2019-09-06 | 中国科学院近代物理研究所 | A kind of high-frequency resonant cavity |
| CN113612012A (en) * | 2021-07-28 | 2021-11-05 | 中国科学院合肥物质科学研究院 | Movable grid type surface wave ion cyclotron antenna structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019100858A1 (en) * | 2017-11-23 | 2019-05-31 | 合肥中科离子医学技术装备有限公司 | Method for conducting cold-cavity test on accelerating voltage of cyclotron by using equivalent parallel impedance |
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| CN108024438A (en) * | 2017-12-13 | 2018-05-11 | 合肥中科离子医学技术装备有限公司 | One kind is used for superconducting cyclotron RF resonator c-type electric connection structures |
| CN108024438B (en) * | 2017-12-13 | 2019-07-05 | 合肥中科离子医学技术装备有限公司 | One kind being used for superconducting cyclotron RF resonant cavity c-type electric connection structure |
| CN108449860A (en) * | 2018-03-05 | 2018-08-24 | 中国科学院高能物理研究所 | A kind of low temperature inserted link tuner and superconductor cavity |
| CN109862685A (en) * | 2019-03-11 | 2019-06-07 | 王飞 | A kind of high frequency cavity and its adjusting method with real-time, tunable formula capacitor |
| CN109862685B (en) * | 2019-03-11 | 2020-12-22 | 王飞 | High-frequency cavity with real-time adjustable capacitor and adjusting method thereof |
| CN110213878A (en) * | 2019-05-29 | 2019-09-06 | 中国科学院近代物理研究所 | A kind of high-frequency resonant cavity |
| CN113612012A (en) * | 2021-07-28 | 2021-11-05 | 中国科学院合肥物质科学研究院 | Movable grid type surface wave ion cyclotron antenna structure |
| CN113612012B (en) * | 2021-07-28 | 2023-09-29 | 中国科学院合肥物质科学研究院 | Movable grid type surface wave ion cyclotron antenna structure |
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