CN202435703U - Variable-frequency tuned cavity - Google Patents
Variable-frequency tuned cavity Download PDFInfo
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- CN202435703U CN202435703U CN 201120517665 CN201120517665U CN202435703U CN 202435703 U CN202435703 U CN 202435703U CN 201120517665 CN201120517665 CN 201120517665 CN 201120517665 U CN201120517665 U CN 201120517665U CN 202435703 U CN202435703 U CN 202435703U
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Abstract
The utility model mainly relates to the technical field of ferrite loaded wide-band, high-frequency and high-voltage synchronous accelerators for forming high-frequency and high-voltage electric fields in vacuum and trapping and accelerating heavy particle beams in the movement direction of the beams, in particular to a high-power ferrite loaded variable-frequency tuned cavity. The variable-frequency tuned cavity comprises a coaxial resonant cavity, and the coaxial resonant cavity comprises a resonant cavity A and a resonant cavity B which are coaxially connected through a flange and are the same in structure. The variable-frequency tuned cavity is mainly characterized in that a leading-in end of a particle beam pipeline of the coaxial resonant cavity is connected with accelerating slits through corrugated pipes, the other end of each accelerating slit is connected with a particle beam leading-in end, insulating ceramics are arranged on the accelerating slits, a high-voltage vacuum capacitor for tuning a cavity and a final power amplifier electron tube of a high-frequency power source are arranged between the accelerating slits, and an anode of the electron tube outputs radio-frequency high voltage loaded at two ends of each accelerating slit.
Description
Technical field
The present invention is chiefly directed to and forms the high-frequency and high-voltage electric field under the vacuum condition; And, relate in particular to a kind of loading and frequency conversion tuning cavity of large power ferrite in the broadband high-frequency and high-voltage synchrotron device technique field that the ferrite that the line direction of motion is captured, quickened heavy particle beam loads.
Background technology
Before this, domestic have only a synchrotron with ferrite loading and frequency conversion tuning coaxial resonant cavity body, is used for Lanzhou heavy particle accelerator cooling storage ring (CSR) main ring, and halved tie stream is captured, and quickens.The cavity because of simple structure, could Cheng by the highest average high-frequency power does not exceed 2kW, and can only work in the duty cycle is less than 1/2 of the sweep pulse mode, the operating frequency range of 0.25MHz ~ 0.25MHz.Afterwards; Become first synchrotron of China to use the loading and frequency conversion tuning cavity of large power ferrite body by The CAS Institute of Modern Physics design and by nearly thing institute with Shaanxi digital broadcasting communication apparatus Co., Ltd joint research and development, be mainly used in the halved tie of CSR experimental ring and flow and accumulate and slow down.CSR main ring cavity is made up of two cavitys that are added with ferrite bead; Be filled with ferrite bead between the internal and external conductor of each cavity; The copper cash that the is parallel to main shaft ring part as the magnetic bias coil is arranged, every circle external chiasma in the middle part in each chamber of coil between ring internal diameter and the inner wire; Embedding has silicon rubber to be used for insulation between ring internal diameter and inner wire, whenever presss from both sides a slice copper coins as heat transmission at a distance from two magnet rings, and the tuning capacity of cavity is a ceramic condenser.
The defective of this prior art is: the high-frequency dielectric loss is bigger, and radiating effect is relatively poor.In addition, cavity can only be operated in the less scanning frequency pulse pattern of average power.Bigger in duty ratio, when cavity voltage is higher, or under the continuous wave working condition, the ferrite temperature can be too high, and dielectric can generate heat, and tuning capacity burns easily.
Summary of the invention
The objective of the invention is to develop the loading and frequency conversion tuning cavity of large power ferrite that is used for the heavy-ion cancer therapy isolated plant, what realization heavy particle therapy ring halved tie stream carried out capturing and quickening.
The object of the invention can be realized through adopting following technical scheme: a kind of frequency conversion tuning cavity; Comprise a coaxial resonant cavity; The resonant cavity A resonant cavity B that described coaxial resonant cavity includes by coaxial connection forms, and resonant cavity A resonant cavity B structure is identical, connects through flange; Its main feature is: particle beam pipeline leading-in end one side at said coaxial resonant cavity is connected with accelerating slit through bellows, and the other end of accelerating slit links to each other with the particle beam leading-in end; Insulating ceramics is located on the accelerating slit; Between accelerating slit, be provided with the tuning final stage power amplifier electron tube with high voltage vacuum capacitors and high frequency power source of cavity, wing output radio frequency high tension is carried in two ends, accelerating slit gap.
Described resonant cavity A or resonant cavity B include therein that the heart is provided with the particle beam pipeline, are provided with inner wire and outer conductor in the outside of particle beam pipeline, between inner wire and outer conductor, are provided with the multi-disc ferrite bead; The magnetic bias coil is located on the inner and outer rings of multi-disc ferrite bead, and the magnetic bias coil is parallel to main shaft between ferrite bead internal diameter and inner wire, and each circle intersects between resonant cavity A resonant cavity B cavity and is communicated with; Between ferrite bead, magnetic bias coil and inner wire, be provided with insulating barrier.
Described magnetic bias coil is led to the internal diameter of the ferrite bead of resonant cavity A by the external diameter of the ferrite bead among the resonant cavity B; Turn to the external diameter of the ferrite bead of resonant cavity A then; The internal diameter that connects the ferrite bead among the resonant cavity B again by the external diameter of the ferrite bead of resonant cavity A; The below external diameter that is communicated with the ferrite bead among the resonant cavity B by the internal diameter of the ferrite bead among the resonant cavity B; Be communicated with the below internal diameter of the ferrite bead of resonant cavity A by the below external diameter of the ferrite bead among the resonant cavity B, turn to the below external diameter of the ferrite bead of resonant cavity A once more, be communicated with the internal diameter of the ferrite bead among the resonant cavity B by the below external diameter of the ferrite bead of resonant cavity A; By the next external diameter of the ferrite bead among the internal diameter connection resonant cavity B of the ferrite bead among the resonant cavity B, circulation successively.
The described insulating barrier that between ferrite bead, magnetic bias coil and inner wire, is provided with is a polytetrafluoroethylene; Described ferrite bead, magnetic bias coil and inner wire are one by teflon-coated.Before ferrite core is installed, with mould with the tetrafluoro extrusion modling on coaxial inner conductor, and simultaneously the magnetic bias coil-conductor is embedded in the middle of the tetrafluoro layer, make the tetrafluoro medium, copper conductor bar, coaxial inner conductor become the one of combining closely and can Precision Machining.
Described between the multi-disc ferrite bead, accompany in, the water flowing cooler pan that external diameter is identical with ferrite bead; Described water flowing cooler pan is provided with water inlet pipe, outlet pipe.
The outside of described coaxial resonant cavity is provided with stainless steel casing, and the sidepiece of coaxial resonant cavity is provided with vacuum chamber two end supports device; Ferrite bead and water cooling dish are installed on the resonant cavity through the supporter of resonant cavity bottom.
Described ferrite core is 24, is located at respectively among the resonant cavity A resonant cavity B cavity.
Described particle beam pipeline links to each other through brace with inner wire.
Described frequency conversion tuning cavity, described magnetic bias coil are 8 circles.
Described frequency conversion tuning cavity, described high voltage vacuum capacitors are (CKT1000P/14kV/160A), for height withstand voltage, high power vacuum ceramic electric capacity; High pressure vacuum electric capacity two ends are provided with the cavity voltage sampling device and supply to detect usefulness.
The final stage power amplifier electron tube (22) of described high frequency power source is (Emac 4CW50000E).
The invention has the beneficial effects as follows: described loading and frequency conversion tuning cavity of large power ferrite is employed in the medium of filling between inner wire and the magnet ring and selects the good polytetrafluoroethylene dielectric material of high frequency performance for use, and solves its processing and forming; In the ferrite core both sides, between ring and the ring water of radiation cold dish is set, and solves the manufacture craft of aqueous cold plate; The cavity tuning capacity is selected for use high withstand voltage, high power ceramic vacuum electric capacity; The magnetic bias coil intersects in the middle part of two cavitys; Cavity such as can dismantle repeatedly at design and structure, and in 0.6MHz～3.9MHz frequency range, cavity is worked under the scanning frequency pulse modulating mode, and ceiling voltage can reach peak value 10kV, has satisfied the job requirement of heavy particle therapy ring radio frequency system.Load that ferrite can bear tens of kilowatts of high frequency powers and temperature is no more than 40 degree, can satisfy the physical modulated Shu Genggao requirement in one step.
1) adopt the coaxial resonance structure of single-ended input 1/4 wavelength, accelerating slit has shortened cavity length at an end of cavity
The medium of 2) between inner wire and magnet ring, filling is selected the good polytetrafluoroethylene dielectric material of high frequency performance for use, and solves its processing and forming problem.
3), between ring and the ring water of radiation cold dish is set, and solves the manufacture craft of aqueous cold plate in iron oxygen ring both sides.
4) it is withstand voltage that the cavity tuning capacity is selected height for use, high power ceramic vacuum electric capacity.
5) the magnetic bias coil intersects in the middle part of 1/4 wavelength coaxial resonant cavity body.
6) cavity can be dismantled repeatedly.
Description of drawings:
Fig. 1 is a cavity schematic diagram of the present invention:
Fig. 2 is a structural front view of the present invention;
Fig. 3 is the A-A cross-sectional view among Fig. 1 of the present invention;
Fig. 4 is the B-B cross-sectional view among Fig. 1 of the present invention;
Fig. 5 is a system works flow process of the present invention.
Among the figure: 1, resonant cavity A, 2. resonant cavity B, 3. particle beam pipeline, 4. insulating ceramics, 5. accelerating slit; 6. ferrite bead, 7. water flowing cooler pan, 8. insulating barrier, 9. magnetic bias coil, the connection space between 11. resonant cavity A and the resonant cavity B; 12. bellows, 13. vacuum chamber two end supports devices, 14. capacitors, 15. inner wires; 16. outer conductor, 17. cavity side support corrosion resistant plate, 18. braces, 19. ferrite cores and aqueous cold plate supporter; 20. aqueous cold plate water inlet pipe and water outlet pipe joint, 21. cavity stainless steel casings, 22. electron tubes, 23. flanges.
Embodiment:
Do further to detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:
See Fig. 1,2,3,4; A kind of frequency conversion tuning cavity comprises a coaxial resonant cavity, and the resonant cavity A1 resonant cavity B2 that described coaxial resonant cavity includes by coaxial connection forms; Resonant cavity A resonant cavity B structure is identical; Connect through flange 23, be connected with accelerating slit 5 in particle beam pipeline 3 leading-in ends one side of said coaxial resonant cavity through bellows 12, the other end of accelerating slit 5 links to each other with the particle beam leading-in end; Insulating ceramics 4 is located on the accelerating slit 5; Between accelerating slit 5, be provided with the tuning final stage power amplifier electron tube 22 with high voltage vacuum capacitors 14 and high frequency power source of cavity, electron tube 22 anodes output radio frequency high tension is carried in two ends, accelerating slit 5 gap.Bellows 12 is used for damping and prevents because the vacuum-chamber dimensions that causes of expanding with heat and contract with cold changes.
Described frequency conversion tuning cavity; Described resonant cavity A1 or resonant cavity B2 include therein, and the heart is provided with particle beam pipeline 3; Be provided with inner wire 15 and outer conductor 16 in the outside of particle beam pipeline 3, between inner wire 15 and outer conductor 16, be provided with multi-disc ferrite bead 6; Magnetic bias coil 9 is located on the inner and outer rings of multi-disc ferrite bead 6, and magnetic bias coil 9 is parallel to main shaft between ferrite bead 6 internal diameters and inner wire 15, and each circle intersects between resonant cavity A resonant cavity B cavity and is communicated with; Between ferrite bead 6, magnetic bias coil 9 and inner wire 15, be provided with insulating barrier 8.
Described magnetic bias coil 9 is led to the internal diameter of the ferrite bead 6-1 of resonant cavity A by the external diameter of the ferrite bead 6-2 among the resonant cavity B; Turn to the external diameter of the ferrite bead 6-1 of resonant cavity A then; The internal diameter that connects the ferrite bead 6-2 among the resonant cavity B again by the external diameter of the ferrite bead 6-1 of resonant cavity A; The below external diameter that is communicated with the ferrite bead 6-2 among the resonant cavity B by the internal diameter of the ferrite bead 6-2 among the resonant cavity B; The below internal diameter that is communicated with the ferrite bead 6-1 of resonant cavity A by the below external diameter of the ferrite bead 6-2 among the resonant cavity B; Turn to the below external diameter of the ferrite bead 6-1 of resonant cavity A once more; Be communicated with the internal diameter of the ferrite bead 6-2 among the resonant cavity B by the below external diameter of the ferrite bead 6-1 of resonant cavity A, connect the next external diameter of the ferrite bead 6-2 among the resonant cavity B, circulation successively by the internal diameter of the ferrite bead 6-2 among the resonant cavity B.Coil is in order to offset the radio-frequency current that radio frequency high tension forms on two halves cavity D.C. magnetic biasing coil, to avoid high-frequency signal to seal in the D.C. magnetic biasing power supply in the cavity intermediate interdigitated, and guaranteeing does not have high frequency power loss on the D.C. magnetic biasing coil.
The described insulating barrier that between ferrite bead 6, magnetic bias coil 9 and inner wire 15, is provided with 8 is polytetrafluoroethylene; Described ferrite bead 6, magnetic bias coil 9 and inner wire 15 are one by teflon-coated.Before ferrite core is installed, with mould with the tetrafluoro extrusion modling on coaxial inner conductor, and simultaneously the magnetic bias coil-conductor is embedded in the middle of the tetrafluoro layer, make the tetrafluoro medium, copper conductor bar, coaxial inner conductor become the one of combining closely and can Precision Machining.
Described frequency conversion tuning cavity, described between multi-disc ferrite bead 6, accompany in, the water flowing cooler pan 7 that external diameter and ferrite bead 6 are identical; Described water flowing cooler pan 7 is provided with water inlet pipe, outlet pipe 20.For the heat that ferrite is produced is taken away; In between the both sides of every ferrite core and two adjacent ferrite cores, accompanying; The water flowing cooler pan that external diameter is identical with ferrite core; Water cooling dish 7 links to each other with outside feed pipe through water inlet pipe and water outlet pipe joint 20, and the heat that ferrite produces is transmitted on the aqueous cold plate, is taken away by the current in the dish.
Described frequency conversion tuning cavity, the outside of described coaxial resonant cavity is provided with stainless steel casing 21, and the sidepiece of coaxial resonant cavity is provided with vacuum chamber two end supports device 13; Ferrite bead 6 is installed on the resonant cavity with the supporter 19 of water cooling dish 7 through the resonant cavity bottom.
Described frequency conversion tuning cavity, described ferrite core 6 is 24, is located at respectively among the resonant cavity A resonant cavity B cavity.
Described frequency conversion tuning cavity, described particle beam pipeline 3 links to each other through brace 18 with inner wire 15.
Described frequency conversion tuning cavity, described magnetic bias coil 9 are 8 circles.
Described frequency conversion tuning cavity, described high voltage vacuum capacitors 14 is (CKT1000P/14kV/160A), for height withstand voltage, high power vacuum ceramic electric capacity; High pressure vacuum electric capacity two ends are provided with the cavity voltage sampling device and supply to detect usefulness.
The final stage power amplifier electron tube (22) of described high frequency power source is (Emac 4CW50000E).
Experimental example: described loading and frequency conversion tuning cavity of large power ferrite, be filled with internal diameter 300mm between the inner wire 15 of its coaxial resonant cavity and the outer conductor 16, external diameter 500mm, totally 24 of the special-purpose ferrite beads 6 of thickness 25mm form the cavity resonant inductance with this.All ferrite beads and aqueous cold plate have supporter 19 to support at cavity bottom, do not stress to guarantee inner wire.Particle beam pipeline 3 places coaxial inner conductor, and the place adds the balance high frequency power through the feed bonding conductor in the acceleration slit, and this voltage is exactly the accelerating voltage of particle.Ferritic effect has two, one, shortens cavity length, and the 2nd, DC magnetic bias current changes ferritic permeability, thereby changes the resonance frequency of cavity.For this reason, be provided with bias current coil 9 in the medium between cavity inner wire and magnet ring, coil 9 is wide 20mm, and the copper coin of thickness 10mm, coil be totally 8 circles.Corresponding 0.6MHz～3.9MHz operating frequency.Coil intersects with copper coin in the middle part of cavity, and purpose is that the high-frequency current that cavity is responded on coil is cancelled out each other, and has only DC magnetic bias current on the coil.
Described loading and frequency conversion tuning cavity of large power ferrite; Ferrite and medium in the cavity are in the strong electromagnetic field of high frequency, owing to magnetic loss and dielectric loss, the absorbing high-frequency energy and generate heat; Endergonic size, i.e. the size of loss is relevant with ferritic performance with dielectric material.For cavity can be operated under the high power high voltage, the present invention is in order to reduce dielectric loss, and the dielectric between ferrite core and the inner wire adopts the little polytetrafluoroethylene of high-frequency loss, and solves its filling moulding difficult problem.Before ferrite core is installed, with mould with the tetrafluoro extrusion modling on coaxial inner conductor, and simultaneously the magnetic bias coil-conductor is embedded in the middle of the tetrafluoro layer, make the tetrafluoro medium, copper conductor bar, coaxial inner conductor become the one of combining closely and can Precision Machining.Like this, cavity just can be dismantled repeatedly, convenient for maintaining and test; For the heat that ferrite is produced is taken away; In between the both sides of every ferrite core and two adjacent ferrite cores, accompanying, external diameter is identical with ferrite core, certain thickness water flowing cooler pan; The heat that ferrite produces is transmitted on the aqueous cold plate, is taken away by the current in the dish; The cavity tuning capacity is selected for use high withstand voltage, high power vacuum ceramic electric capacity, and cool off with blower fan.
Adopt above design and structure, in 0.6MHz～3.9MHz frequency range, cavity is worked under the scanning frequency pulse modulating mode, and peak is pressed can reach peak value 10kV, has satisfied the job requirement of heavy particle therapy ring radio frequency system.
System works flow process of the present invention is seen Fig. 5,
1. DC magnetic bias current changes with the high frequency frequency change;
2. the ferrite permeability changes with bias current;
3. the cavity inductance changes with the ferrite permeability;
4. cavity inductance and resonant capacitance form the resonant circuit (this resonant tank is the wing circuit) of frequency change;
5. wing output radio frequency high tension is carried in the accelerating gap two ends.
Claims (9)
1. frequency conversion tuning cavity; Comprise a coaxial resonant cavity; Resonant cavity A (1) the resonant cavity B (2) that described coaxial resonant cavity includes by coaxial connection forms, and resonant cavity A (1) resonant cavity B (2) structure is identical, connects through flange (23); It is characterized in that: particle beam pipeline (3) leading-in end one side at said coaxial resonant cavity is connected with accelerating slit (5) through bellows (12), and the other end of accelerating slit (5) links to each other with the particle beam leading-in end; Insulating ceramics (4) is located on the accelerating slit (5); Between accelerating slit (5), be provided with the tuning final stage power amplifier electron tube (22) with high voltage vacuum capacitors (14) and high frequency power source of cavity, electron tube (22) anode output radio frequency high tension is carried in accelerating slit (5) two ends, gap.
2. frequency conversion tuning cavity as claimed in claim 1; The heart is provided with particle beam pipeline (3) to it is characterized in that including described resonant cavity A (1) or resonant cavity B (2) therein; Be provided with inner wire (15) and outer conductor (16) in the outside of particle beam pipeline (3), between inner wire (15) and outer conductor (16), be provided with multi-disc ferrite bead (6); Magnetic bias coil (9) is located on the inner and outer rings of multi-disc ferrite bead (6); Magnetic bias coil (9) is parallel to main shaft between ferrite bead (6) internal diameter and inner wire (15), each circle intersects between resonant cavity A (1) resonant cavity B (2) cavity and is communicated with; Between ferrite bead (6), magnetic bias coil (9) and inner wire (15), be provided with insulating barrier (8).
3. frequency conversion tuning cavity as claimed in claim 2; It is characterized in that described magnetic bias coil (9) is led to the internal diameter of the ferrite bead (6-1) of resonant cavity A (1) by the external diameter of the ferrite bead among the resonant cavity B (6-2); Turn to the external diameter of the ferrite bead (6-1) of resonant cavity A (1) then; The internal diameter that connects the ferrite bead (6-2) among the resonant cavity B (2) again by the external diameter of the ferrite bead (6-1) of resonant cavity A (1); The below external diameter that is communicated with the ferrite bead (6-2) among the resonant cavity B (2) by the internal diameter of the ferrite bead (6-2) among the resonant cavity B (2); The below internal diameter that is communicated with the ferrite bead (6-1) of resonant cavity A (1) by the below external diameter of the ferrite bead (6-2) among the resonant cavity B (2); Turn to the below external diameter of the ferrite bead (6-1) of resonant cavity A (1) once more; Be communicated with the internal diameter of the ferrite bead (6-2) among the resonant cavity B (2) by the below external diameter of the ferrite bead (6-1) of resonant cavity A (1), connect the next external diameter of the ferrite bead (6-2) among the resonant cavity B (2), circulation successively by the internal diameter of the ferrite bead (6-2) among the resonant cavity B (2).
4. frequency conversion tuning cavity as claimed in claim 2 is characterized in that the described insulating barrier (8) that between ferrite bead (6), magnetic bias coil (9) and inner wire (15), is provided with is a polytetrafluoroethylene; Described ferrite bead (6), magnetic bias coil (9) and inner wire (15) are one by teflon-coated.
5. frequency conversion tuning cavity as claimed in claim 2, it is characterized in that described between multi-disc ferrite bead (6), accompany in, the water flowing cooler pan (7) that external diameter is identical with ferrite bead (6); Described water flowing cooler pan (7) is provided with water inlet pipe, outlet pipe (20).
6. frequency conversion tuning cavity as claimed in claim 2 is characterized in that the outside of described coaxial resonant cavity is provided with stainless steel casing (21), and the sidepiece of coaxial resonant cavity is provided with stainless steel bracing frame (13); Ferrite bead (6) and water cooling dish (7) are installed on the resonant cavity through the supporter (19) of resonant cavity bottom.
7. frequency conversion tuning cavity as claimed in claim 2 is characterized in that: described ferrite core (6) is 24, is located at respectively among the resonant cavity A resonant cavity B cavity.
8. frequency conversion tuning cavity as claimed in claim 2 is characterized in that: described particle beam pipeline (3) links to each other through brace (18) with inner wire (15).
9. frequency conversion tuning cavity as claimed in claim 2 is characterized in that: described magnetic bias coil (9) is 8 circles.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120517665 CN202435703U (en) | 2011-12-10 | 2011-12-10 | Variable-frequency tuned cavity |
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| CN 201120517665 CN202435703U (en) | 2011-12-10 | 2011-12-10 | Variable-frequency tuned cavity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711357A (en) * | 2011-12-10 | 2012-10-03 | 中国科学院近代物理研究所 | Variable frequency tuning cavity |
| CN110035597A (en) * | 2019-04-30 | 2019-07-19 | 中国科学院近代物理研究所 | A kind of frequency conversion nonresonant cavity configuration |
| CN113394533A (en) * | 2021-05-20 | 2021-09-14 | 中国人民解放军海军工程大学 | Composite ceramic type gyromagnetic nonlinear transmission line |
-
2011
- 2011-12-10 CN CN 201120517665 patent/CN202435703U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711357A (en) * | 2011-12-10 | 2012-10-03 | 中国科学院近代物理研究所 | Variable frequency tuning cavity |
| CN102711357B (en) * | 2011-12-10 | 2015-05-20 | 中国科学院近代物理研究所 | Variable frequency tuning cavity |
| CN110035597A (en) * | 2019-04-30 | 2019-07-19 | 中国科学院近代物理研究所 | A kind of frequency conversion nonresonant cavity configuration |
| CN110035597B (en) * | 2019-04-30 | 2021-11-02 | 中国科学院近代物理研究所 | Frequency conversion non-tuning cavity structure |
| CN113394533A (en) * | 2021-05-20 | 2021-09-14 | 中国人民解放军海军工程大学 | Composite ceramic type gyromagnetic nonlinear transmission line |
| CN113394533B (en) * | 2021-05-20 | 2022-03-04 | 中国人民解放军海军工程大学 | Composite ceramic type gyromagnetic nonlinear transmission line |
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