CN106255306A - A kind of cyclotron resonance chamber controllable impedance coupling matching method and apparatus - Google Patents
A kind of cyclotron resonance chamber controllable impedance coupling matching method and apparatus Download PDFInfo
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- CN106255306A CN106255306A CN201610723990.0A CN201610723990A CN106255306A CN 106255306 A CN106255306 A CN 106255306A CN 201610723990 A CN201610723990 A CN 201610723990A CN 106255306 A CN106255306 A CN 106255306A
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- coupling ring
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- coaxial waveguide
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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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Abstract
The invention discloses a kind of cyclotron resonance chamber controllable impedance coupling matching method and apparatus, this matching process includes: analyzes according to resonator cavity physical Design, calculates installation site and the effective area of coupling ring；In resonator cavity, coupling ring is installed in bar upper shed, and stretches out from interior bar；Coaxial waveguide outer conductor is connected with bar in resonator cavity, coaxial waveguide inner wire is made electrical contact with coupling ring；Using vector network analyzer regulation coupling matching, vector network analyzer one end is connected on feeder line input, measures reflection coefficient S11, and as S11, < during 25dB, at this moment coupling reaches matching status.The present invention is to achieve energy feeding to enter the purpose of cavity, by moving horizontally regulation coupling ring, changes the area of coupling ring, regulates coupled magnetic flux, it is achieved feeder line mates with cavity, it is to avoid mismatch, cause high-power reflection, damages transmission waveguide.
Description
Technical field
The invention belongs to cyclotron technical field, relate to a kind of cyclotron resonance chamber controllable impedance coupling matching
Method and apparatus.
Background technology
Cyclotron is increasingly wider in the application of the every field such as scientific research, industrial and agricultural production and biomedicine,
The scientific research fields such as Isotope production and diagnosis, proton therapeutic, high-energy physics, nuclear physics, material science, chemistry, biology are sent out
Wave the most important effect.Along with the requirement of cyclotron research improves day by day, superconducting cyclotron compact conformation,
Superior performance, economic feature are paid attention to.The major function of cyclotron is under the guiding in magnetic field, utilizes high-frequency electric field
Proton emission to high-energy.
The key component of cyclotron virtual prototype radio frequency system design is the design of resonator cavity, its natural oscillation frequency
The complete machine that rate not only has influence on high frequency transmitter mates, and also determines the change frequency of accelerating field, it is necessary to the rotation of ion
Turning Frequency Synchronization, the frequency of resonator cavity also can cause the change of physical form to change because of cavity loss heating etc..
Coupling device is as connecting the big subsystem transmitter of accelerator radio frequency system two and the key equipment of cavity, right
The safe and reliable operation of radio frequency system plays very important effect.The Main Function of coupling device is to be exported by transmitter
High frequency power be fed to cavity, to produce the high-frequency electric field accelerated required for ion.
In order to effectively the high frequency power that transmitter exports is fed into cavity, it is important that coupled system is also responsible for another
The effect of task, i.e. impedance transformation: due to transmitter likely away from cavity, high frequency power usually needs by longer transmission
Line is transported to cavity.In general, cavity is a high resistant device, and transmission line is usually standard transmission system, i.e. characteristic resistance
Resisting is the transmission line (low frequency) of 50 ohm, so impedance transformation must be carried out, will be transformed to the impedance of 50 ohm by cavity, in order to
With transmission system matches, thus obtain maximum power transfer condition.The mode of coupling is a lot, master conventional in proton precessional magnetometer
Inductive coupled if (coupling ring coupling) and capacitive coupling (Capacitance Coupled) two ways；The existence of coupling unit, can make resonance
In cavity, the distribution of electromagnetic field is affected, thus can cause the change of resonant frequency.
Summary of the invention
It is an object of the invention to provide a kind of cyclotron resonance chamber controllable impedance coupling matching method and apparatus, use
In by high frequency source RF power fed-in to accelerator cavity body, form ion high frequency accelerating field, it is ensured that in accelerator structure
In the case of compact, coupling matching device does not take additional space, but bar hollow gap in utilizing resonator cavity, it is achieved can
Adjust coupling matching.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of cyclotron resonance chamber controllable impedance coupling matching method, this matching process comprises the steps:
1) analyze according to resonator cavity physical Design, calculate installation site and the effective area of coupling ring；
2) in resonator cavity, coupling ring is installed in bar upper shed, and stretches out from interior bar；
3) coaxial waveguide outer conductor is connected with bar in resonator cavity, coaxial waveguide inner wire is made electrical contact with coupling ring；
4) using vector network analyzer regulation coupling matching, vector network analyzer one end is connected on feeder line input, surveys
Amount reflection coefficient S11, if S11 >-25dB, observes vector network analyzer impedance circle diagram, if match point is not in impedance circle diagram
Portion, coupling ring outwards moves horizontally；If match point is inside impedance circle diagram, coupling ring inwardly moves horizontally, when impedance circle diagram mistake
During match point, stopping moving horizontally coupling ring, observe the change of S11 simultaneously, as S11 <-25dB, at this moment coupling reaches coupling
State.
Described coaxial waveguide inner wire is fixing with variable-diameter structure upper end to be connected, and variable-diameter structure lower end makes electrical contact with coupling ring,
Bar and the excellent electric contact of coupling ring in realizing, impedance smooth excessiveness, reflection coefficient is little.
Described coupling ring is arranged on interior bar by horizontal shift structure, makes coupling ring horizontally slip, and changes coupling ring
Area, guarantees that coupling ring upper end is good with the electrical contact of coaxial waveguide inner wire simultaneously, and coupling ring lower end connects with bar electricity in resonator cavity
Touch good.
A kind of cyclotron resonance chamber controllable impedance coupling matching device, this device includes the interior bar running through resonator cavity,
This interior bar upper end is connected with coaxial waveguide outer conductor；In resonator cavity, interior bar upper end is extended with coupling ring, and described coupling ring ring is put down
Face is orthogonal with magnetic field line, and coupling ring couples with resonator cavity in high-intensity magnetic field district, and coupling ring one end makes electrical contact with coaxial waveguide inner wire,
The other end forms energy with the electrical contact of interior bar and couples.
Described coupling ring uses horizontal shift structure, regulation feeder line and the coupling matching of resonator cavity.
Described horizontal shift structure is U-shaped coupling ring, and with coaxial waveguide inner wire contact jaw, vertical direction opens notch cuttype
Groove, increases coupling ring and inner wire contact area, strengthens coupling ring upper end and coaxial waveguide inner wire electrical contact performance；Coupling ring
Lower end is embedded in resonator cavity on bar, it is ensured that good with bar electrical contact in resonator cavity；U-shaped coupling ring contacts with coaxial waveguide inner wire
End, the notch cuttype groove that vertical direction is opened extends along horizontal direction, it is ensured that coupling ring horizontally slips, and changes the area of coupling ring；
Described feeder line and bar integrated design in resonator cavity；Described coaxial waveguide outer conductor and bar chi in accelerator cavity
Very little unanimously, interior bar is connected with outer conductor；Described coaxial waveguide inner wire stretches into interior bar, and passes through variable-diameter structure top and couple
Ring upper surface makes electrical contact with.
Described coupling ring moves horizontally the area of the prominent interior bar of regulation coupling ring, changes coupling amount and makes cavity and on-axis wave
Lead 50 Europe impedance matchings.
Described coupling ring stretches out in resonator cavity high-intensity magnetic field district, is positioned at masthead end position.
Described variable-diameter structure is circular platform type, coaxial waveguide inner wire be smoothly transitted into the chi consistent with coupling ring width
Very little, round platform front end uses notch cuttype to be embedded in U-shaped coupling ring, increases the contact surface with coupling ring, it is achieved inner wire and coupling ring
Electrical contact is good.
Beneficial effects of the present invention: the present invention is stretched out by coupling ring bar in accelerator cavity, is placed on high-intensity magnetic field
Region, and make plane of a loop orthogonal with magnetic field line, flows through the magnetic field in the electric current of ring can encourage resonator cavity, reaches energy feeding
Enter the purpose of cavity, by moving horizontally regulation coupling ring, change the area of coupling ring, regulate coupled magnetic flux, it is achieved
Feeder line mates with cavity, it is to avoid mismatch, causes high-power reflection, damages transmission waveguide；Feeder line and bar one in resonator cavity simultaneously
Bodyization designs, and compact conformation, coaxial waveguide feeder line inner wire passes through variable-diameter structure, it is achieved inner wire connects with the good electrical of coupling ring
Touch, the smooth excessiveness of impedance.
Accompanying drawing explanation
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 controllable impedance coupling ring general arrangement structure chart of the present invention；
Fig. 2 is controllable impedance coupling ring principle schematic of the present invention；
Fig. 3 is resonator cavity coupling matching principle schematic of the present invention；
In figure: 1-coaxial waveguide；2-coaxial waveguide and interior bar junction；3-short board；4-coupling ring；5-DEE；6-visits
Pin；7-resonator cavity；Bar in 8-.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all other
Embodiment, broadly falls into the scope of protection of the invention.
A kind of cyclotron resonance chamber controllable impedance coupling matching device, sees Fig. 1, including running through the interior of resonator cavity 7
Bar 8, this interior bar 8 upper end is connected with coaxial waveguide 1；Short board 3, bar 8 resonant cavity 7 in connecting, slide up and down short board and change
The height of resonator cavity 7；In resonator cavity 7, probe 6 is stretched out in short board 3 bottom, gives with resonator cavity 7 Coupled Feedback signal and controls system
System；In resonator cavity 7, interior bar 8 upper end is extended with coupling ring 4, and coupling ring 4 couples with resonator cavity 7 in high-intensity magnetic field district, coupling ring 4
One end makes electrical contact with coaxial waveguide 1 inner wire, and the other end forms energy with the electrical contact of interior bar 8 and couples；
Horizontal shift structure is U-shaped coupling ring, and with coaxial waveguide inner wire contact jaw, vertical direction is opened notch cuttype groove, increased
Big coupling ring and inner wire contact area, it is ensured that coupling ring upper end is good with the electrical contact of coaxial waveguide inner wire；Coupling ring lower end
It is embedded in resonator cavity on bar, good with bar electrical contact in resonator cavity；U-shaped coupling ring and coaxial waveguide inner wire contact jaw, vertically
The notch cuttype groove that direction is opened extends along horizontal direction, it is ensured that coupling ring horizontally slips, and changes the area of coupling ring；
Variable-diameter structure is circular platform type, coaxial waveguide inner wire be smoothly transitted into the size consistent with coupling ring width, circle
Platform front end uses notch cuttype to be embedded in U-shaped coupling ring, increases the contact surface with coupling ring, it is achieved inner wire makes electrical contact with coupling ring
Well.
Seeing Fig. 1, Fig. 2, a kind of cyclotron resonance chamber controllable impedance coupling matching method, the method includes: by coupling
Cyclization 4 combines with the interior bar 8 of accelerator cavity 7, and in accelerator cavity, bar 8 stretches out, and is placed on high magnetic field area,
And make coupling ring plane of a loop orthogonal with magnetic field line, flow through the magnetic field in the electric current of coupling ring can encourage resonator cavity 7, reach feedback
Energy is sent to enter the purpose of cavity；Coupling ring 4 one end makes electrical contact with coaxial waveguide 1 inner wire, and the other end and interior bar 8 make electrical contact with shape
Become energy coupling；Coupling ring 4 uses horizontal shift structure, for regulating the area of the prominent interior bar of coupling ring, changes coupling amount, makes
Obtain resonator cavity and coaxial waveguide 50 Europe impedance matching, reach peak power feed-in resonator cavity；Microwave energy feeder line coaxial waveguide 1 with
Bar 8 integrated design in resonator cavity, coaxial waveguide 1 outer conductor and bar 8 consistent size in accelerator cavity, interior bar and outer conductor
Being connected together, coaxial waveguide 1 inner wire stretches into interior bar 8, and is connect with coupling ring upper surface electricity by variable-diameter structure top
Touch.Coaxial waveguide inner wire variable-diameter structure, it is achieved interior bar and the excellent electric contact of coupling ring, impedance smooth excessiveness, reflection coefficient
Little.
Coupling ring itself have to be sufficiently small, in the case of not affecting resonant frequency and magnetic distribution, it is achieved
The effect of coupling, this determines the size of coupling ring substantially.The equivalent circuit of inductive coupled system, as it is shown on figure 3, L, C, R generation
The equivalent parallel lumped parameter original paper of table resonator cavity, these electrical quantitys can not directly calculate.The coupling ring equivalent coil number of turn
Relation than between n and coupling ring geometric parameter:
In formula, φ t, φ c represent by coupling collar extension place plane and the size of the effective flux of coupling ring respectively,
Ht, Hc represent the average field strength size that coupling ring place plane is corresponding with coupling ring face respectively, and St, Sc represent vacuum respectively
Indoor coupling ring place plane and the size of coupling ring live part.
Utilize the condition of load and line characteristic impedance conjugate impedance match, available:
R=n2Z0
In conjunction with two formula above, the relation between coupling ring geometric parameter and electrical quantity is
It is a ratio on the right of equation, unrelated with the high-frequency signal power size of input at coupling port, can be by means of
Characteristic value solver calculates the magnitude of field intensity of coupling ring position, can obtain the effective area Sc of coupling ring.
The Implement methodology of the present invention is as follows:
1) first analyze according to resonator cavity physical Design, calculate position and the effective area of coupling ring；
2) installing coupling ring in interior bar upper shed, when making coupling ring move horizontally regulation, coupling ring upper end is not electric with interior bar
Contact, lower end is good with the electrical contact of interior bar；
3) coaxial waveguide inner wire is fixing with variable-diameter structure upper end is connected, and variable-diameter structure lower end makes electrical contact with coupling ring, coupling
During cyclization horizontal adjustment, make electrical contact with the best；Coaxial outer conductor is connected with bar in resonator cavity；
4), after the integral installation of adjustable coupling coalignment is fixing, vector network analyzer regulation coupling matching, vector are used
Network Analyzer one end is connected on feeder line input, measures reflection coefficient S11, if S11 >-25dB, observes vector network analyzer resistance
Anti-circle diagram, if match point is not inside impedance circle diagram, coupling ring outwards moves horizontally；If match point is inside impedance circle diagram, coupling
Cyclization inwardly moves horizontally, and when impedance circle diagram overmatching point, stops moving horizontally coupling ring, observes the change of S11 simultaneously, when
During S11 <-25dB, at this moment coupling reaches matching status.
Above content is only to present configuration example and explanation, affiliated those skilled in the art couple
Described specific embodiment makes various amendment or supplements or use similar mode to substitute, without departing from invention
Structure or surmount scope defined in the claims, all should belong to protection scope of the present invention.
Claims (10)
1. a cyclotron resonance chamber controllable impedance coupling matching method, it is characterised in that this matching process includes following
Step:
1) analyze according to resonator cavity physical Design, calculate installation site and the effective area of coupling ring；
2) in resonator cavity, coupling ring is installed in bar upper shed, and stretches out from interior bar；
3) coaxial waveguide outer conductor is connected with bar in resonator cavity, coaxial waveguide inner wire is made electrical contact with coupling ring；
4) using vector network analyzer regulation coupling matching, vector network analyzer one end is connected on feeder line input, measures anti-
Penetrate coefficient S 11, if S11 >-25dB, observe vector network analyzer impedance circle diagram, if match point is not inside impedance circle diagram, coupling
Cyclization outwards moves horizontally；If match point is inside impedance circle diagram, coupling ring inwardly moves horizontally, when impedance circle diagram overmatching point
Time, stop moving horizontally coupling ring, observe the change of S11 simultaneously, as S11 <-25dB, at this moment coupling reaches matching status.
2. a cyclotron resonance chamber controllable impedance coupling matching device, it is characterised in that this device includes running through resonance
The interior bar in chamber, this interior bar upper end is connected with coaxial waveguide；And short board, bar resonant cavity in connecting, slide up and down short board
Change the height of resonator cavity；
In described resonator cavity, probe is stretched out in short board bottom, with resonator cavity Coupled Feedback signal to control system；
In described resonator cavity, interior bar upper end is extended with coupling ring, and coupling ring couples with resonator cavity in high-intensity magnetic field district, coupling ring
One end makes electrical contact with coaxial waveguide inner wire, and the other end forms energy with the electrical contact of interior bar and couples.
A kind of cyclotron resonance chamber the most according to claim 2 controllable impedance coupling matching device, it is characterised in that
Described coaxial waveguide inner wire is fixing with variable-diameter structure upper end to be connected, and variable-diameter structure lower end makes electrical contact with coupling ring.
A kind of cyclotron resonance chamber the most according to claim 2 controllable impedance coupling matching device, it is characterised in that
Described coupling ring is arranged on interior bar by horizontal shift structure, makes coupling ring horizontally slip, and changes the area of coupling ring.
A kind of cyclotron resonance chamber the most according to claim 4 controllable impedance coupling matching device, it is characterised in that
Described coupling ring uses horizontal shift structure, regulation feeder line and the coupling matching of resonator cavity.
A kind of cyclotron resonance chamber the most according to claim 5 controllable impedance coupling matching device, it is characterised in that
Described horizontal shift structure is U-shaped coupling ring, and itself and coaxial waveguide inner wire contact jaw, vertical direction offers notch cuttype groove；
Coupling ring lower end is embedded in resonator cavity on bar；U-shaped coupling ring and coaxial waveguide inner wire contact jaw, the notch cuttype that vertical direction is opened
Groove extends along horizontal direction, it is ensured that coupling ring horizontally slips, and changes the area of coupling ring.
A kind of cyclotron resonance chamber the most according to claim 5 controllable impedance coupling matching device, it is characterised in that
Described feeder line and bar integrated design in resonator cavity；Described coaxial waveguide outer conductor and bar consistent size in accelerator cavity,
Interior bar is connected with outer conductor；Described coaxial waveguide inner wire stretches into interior bar, and by variable-diameter structure top and coupling ring upper end
Face makes electrical contact with.
A kind of cyclotron resonance chamber the most according to claim 4 controllable impedance coupling matching device, it is characterised in that
Described coupling ring moves horizontally the area of the prominent interior bar of regulation coupling ring, changes coupling amount and cavity is hindered with coaxial waveguide 50 Europe
Anti-coupling.
A kind of cyclotron resonance chamber the most according to claim 4 controllable impedance coupling matching device, it is characterised in that
Described coupling ring stretches out in resonator cavity high-intensity magnetic field district, is positioned at masthead end position, and described coupling ring plane of a loop is with magnetic field line just
Handing over, coupling ring couples with resonator cavity in high-intensity magnetic field district.
A kind of cyclotron resonance chamber the most according to claim 3 controllable impedance coupling matching device, its feature exists
In, described variable-diameter structure is circular platform type, and round platform front end uses notch cuttype to be embedded in U-shaped coupling ring.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385758A (en) * | 2016-11-11 | 2017-02-08 | 合肥中科离子医学技术装备有限公司 | Capacitive coupling matching method for superconductive cyclotron resonant cavity |
| CN108051652A (en) * | 2017-12-12 | 2018-05-18 | 合肥中科离子医学技术装备有限公司 | The method that cavity body filter accurately measures quality factor |
| CN110416681A (en) * | 2019-08-01 | 2019-11-05 | 电子科技大学 | A kind of resonant cavity coupling amount wideband self-adaptive regulating and method |
| CN112798873A (en) * | 2020-12-30 | 2021-05-14 | 中国原子能科学研究院 | End coupling cavity measuring device and end coupling cavity measuring method for coupling cavity accelerating structure |
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| JPH06176896A (en) * | 1992-12-01 | 1994-06-24 | Ishikawajima Harima Heavy Ind Co Ltd | High frequency accelerating cavity of particle accelerator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385758A (en) * | 2016-11-11 | 2017-02-08 | 合肥中科离子医学技术装备有限公司 | Capacitive coupling matching method for superconductive cyclotron resonant cavity |
| CN108051652A (en) * | 2017-12-12 | 2018-05-18 | 合肥中科离子医学技术装备有限公司 | The method that cavity body filter accurately measures quality factor |
| CN110416681A (en) * | 2019-08-01 | 2019-11-05 | 电子科技大学 | A kind of resonant cavity coupling amount wideband self-adaptive regulating and method |
| CN110416681B (en) * | 2019-08-01 | 2021-02-26 | 电子科技大学 | Broadband adaptive adjusting device and method for resonant cavity coupling quantity |
| CN112798873A (en) * | 2020-12-30 | 2021-05-14 | 中国原子能科学研究院 | End coupling cavity measuring device and end coupling cavity measuring method for coupling cavity accelerating structure |
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