CN110035597B - Frequency conversion non-tuning cavity structure - Google Patents
Frequency conversion non-tuning cavity structure Download PDFInfo
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- CN110035597B CN110035597B CN201910359890.8A CN201910359890A CN110035597B CN 110035597 B CN110035597 B CN 110035597B CN 201910359890 A CN201910359890 A CN 201910359890A CN 110035597 B CN110035597 B CN 110035597B
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- 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
- H05H13/04—Synchrotrons
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- H—ELECTRICITY
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- 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
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Abstract
The invention discloses a frequency conversion non-tuning cavity structure, which comprises: at least two basic coaxial resonant cavity units; the basic coaxial resonant cavity units are sequentially arranged in parallel; each basic coaxial resonant cavity unit comprises a first resonant cavity and a second resonant cavity which are connected in a coaxial mode, and an acceleration gap which is arranged between the first resonant cavity and the second resonant cavity in a coaxial mode; the first resonant cavity and the second resonant cavity are coaxially provided with beam pipelines, the beam pipeline in the first resonant cavity and the beam pipeline in the second resonant cavity are arranged at intervals in an acceleration gap to form an acceleration seam in the basic coaxial resonant cavity unit, a ceramic insulating sleeve is sleeved outside the acceleration seam, and two ends of the insulating ceramic sleeve are respectively connected with the end parts of the beam pipelines on the corresponding sides; beam pipelines between two adjacent basic coaxial resonant cavity units are connected with each other; the external power source is connected with the accelerating gaps in all the basic coaxial resonant cavity units through transmission lines.
Description
Technical Field
The invention relates to a frequency conversion non-tuned cavity structure, in particular to a frequency conversion non-tuned cavity structure loaded by a magnetic alloy material, and belongs to the technical field of high-frequency loading cavities of synchrotrons.
Background
The synchrotron is the most widely applied accelerator in the field of high-energy accelerators at present, and has wide application in the fields of aerospace, biology, materials, particle therapy and the like. The high-frequency cavity is the most important component of the synchrotron, and is the most important place for performing longitudinal and transverse operations such as trapping, acceleration, deceleration, rotation, compression and the like on charged particles such as heavy ions, protons and the like: the high-frequency cavity can receive power fed in from a power source, a required high-frequency and high-voltage electric field is formed in an acceleration gap in the cavity by utilizing the power, and charged particles such as heavy ions and protons enter the high-frequency cavity and then interact with the electric field at the acceleration gap to obtain the required charged particle beam current such as the heavy ions and the protons.
The prior art of the high-frequency cavity of the synchrotron is mainly divided into a frequency conversion tuning cavity loaded by ferrite materials and a frequency conversion non-tuning cavity loaded by magnetic alloy materials. The frequency conversion tuning cavity loaded by ferrite material belongs to a high-frequency cavity which has earlier development, more traditional technology and wider application in a synchrotron, but has more obvious defects, such as complex system structure, narrow frequency band, low acceleration gradient and the like and can only work in a tuning (resonance) state; the variable-frequency non-tuned cavity loaded by the magnetic alloy material is a relatively advanced high-frequency cavity in the conventional synchrotron, and compared with the traditional variable-frequency tuned cavity loaded by the ferrite material, the variable-frequency non-tuned cavity loaded by the magnetic alloy material has the advantages of simple system, no need of tuning, capability of working in a detuning state, wide frequency band, high acceleration gradient and the like.
The actual work of the variable-frequency non-tuned cavity loaded by the magnetic alloy material is less developed in China, and only modern physical research institute of Chinese academy, Shanghai and Qinghua develop research work at present, and the variable-frequency non-tuned cavity loaded by the magnetic alloy material is successfully processed respectively. As shown in figure 1, the three cavities are all in a single acceleration gap structure and are cooled by strong wind, the highest working voltage does not exceed 2kV, the maximum size (outer diameter) of the magnetic alloy material does not exceed phi 460mm, and the acceleration gradient does not exceed 3 kV/m. It can be seen that the existing magnetic alloy material loading frequency conversion non-tuned cavity structure in China has the following defects: firstly, the working voltage and the acceleration gradient are low, and the advantages of a frequency conversion non-tuned cavity loaded by a magnetic alloy material relative to a frequency conversion tuned cavity loaded by a ferrite material cannot be reflected in the aspects of cavity voltage and acceleration gradient. Secondly, along with the improvement of the required working voltage, if the domestic current magnetic alloy material loading frequency conversion non-tuned cavity prior art is continuously adopted, the magnetic alloy material required to be loaded by the cavity, the longitudinal length of the cavity and the like can be doubled, so that the electrical length of the cavity is continuously increased, the difference between the short-circuit end voltage and the open-circuit end voltage of the cavity is overlarge, and the acceleration gradient is not obviously improved. And thirdly, along with the improvement of required working voltage, the cavity loss power can be rapidly increased along with the square relation of the voltage, so that strong wind cannot meet the cooling requirement of the magnetic alloy material, the temperature inside the material can be rapidly close to the Curie temperature of the material, the performance of the material is reduced, and the material can sink into vicious circle of further increase of cavity power loss and continuous increase of high-frequency loss of the material. The maximum size (outer diameter) of the magnetic alloy material is not more than phi 460mm, the performance of the magnetic alloy material is limited, and indexes such as cavity acceleration gradient and the like cannot be improved in the aspect of material performance.
Disclosure of Invention
In view of the above problems, the present invention provides a high-power broadband high-voltage magnetic alloy material loaded multi-acceleration gap liquid-cooled frequency-conversion non-tuned cavity structure, which can effectively improve the working voltage and acceleration gradient provided by the cavity, significantly reduce the temperature of the magnetic alloy material, and compress the installation length of the cavity and the amount of loaded magnetic alloy material under the same frequency and voltage. The structure is applied to a high-frequency loading cavity of the synchrotron, and the synchrotron can output charged particle beams of high-energy heavy current ions, protons and the like.
In order to achieve the above object, the present invention adopts the following technical solution, and a frequency conversion non-tuned cavity structure, which is characterized by comprising:
at least two basic coaxial resonant cavity units; the basic coaxial resonant cavity units are sequentially arranged in parallel; each basic coaxial resonant cavity unit comprises a first resonant cavity and a second resonant cavity which are connected in a coaxial mode, and an acceleration gap which is arranged between the first resonant cavity and the second resonant cavity in a coaxial mode; beam pipelines are coaxially arranged in the first resonant cavity and the second resonant cavity, the beam pipeline in the first resonant cavity and the beam pipeline in the second resonant cavity are arranged in the acceleration gap at intervals to form an acceleration gap in the basic coaxial resonant cavity unit, a ceramic insulating sleeve is sleeved outside the acceleration gap, and two ends of the insulating ceramic sleeve are respectively connected with the end parts of the beam pipelines on the corresponding sides; the beam pipelines between two adjacent basic coaxial resonant cavity units are connected with each other;
and the external power source is connected with the accelerating slits in all the basic coaxial resonant cavity units through a transmission line, so that the power output by the final stage of the external power source is simultaneously fed into all the basic coaxial resonant cavity units and is loaded at two ends of the accelerating slits in each basic coaxial resonant cavity unit.
Preferably, the first resonant cavity and the second resonant cavity have the same structure, and both comprise:
the inner conductor is internally provided with a cylindrical cavity; the beam pipeline is arranged in a cylindrical cavity in the inner conductor;
an outer conductor disposed outside the inner conductor;
the magnetic alloy rings are arranged between the inner conductor and the outer conductor and are distributed at intervals along the axial direction of the beam pipeline;
the two axial end faces of the inner conductor and the outer conductor are closed to form a first closed resonant cavity and a second closed resonant cavity, and cooling liquid is filled in the first resonant cavity and the second resonant cavity.
Preferably, a cooling liquid inlet and a cooling liquid outlet are arranged on the outer conductors of the first resonant cavity and the second resonant cavity; and liquid leakage valves and gas outlet valves are arranged on the outer conductors of the first resonant cavity and the second resonant cavity.
Preferably, the first resonant cavity and the second resonant cavity both adopt quarter-wavelength coaxial resonant cavities, and the short-circuit ends of the first resonant cavity and the second resonant cavity are in high-frequency contact with the inner conductor and the outer conductor of the first resonant cavity and the second resonant cavity; the open ends of the first resonant cavity and the second resonant cavity are oppositely arranged, the open ends of the first resonant cavity and the second resonant cavity are both sealed by insulating medium discs, and through holes for beam pipelines to pass through are formed in the insulating medium discs; the acceleration gap is positioned between the open end of the first resonant cavity and the open end of the second resonant cavity, and good high-frequency contact is formed between the outer conductor of the acceleration gap and the outer conductors of the first resonant cavity and the second resonant cavity; and good high-frequency contact is formed between the beam pipeline and the short-circuit ends of the first resonant cavity and the second resonant cavity corresponding to the beam pipeline.
Preferably, the number of the magnetic alloy rings in the first resonant cavity and the second resonant cavity is the same, and a plurality of the magnetic alloy rings are sequentially distributed at intervals from the open end to the short end in the first resonant cavity or the second resonant cavity according to the sequence of the performance from high to low.
Preferably, a short-circuit end plate is arranged at one end between the inner conductor and the outer conductor to form the first resonant cavity or a short-circuit end on the first resonant cavity, a containing groove is formed in the end face of the outer conductor and the end face of the inner conductor, which are on the same side as the short-circuit end, a high-frequency spring is placed in the containing groove, and the short-circuit end plate is tightly pressed on the end faces of the inner conductor and the outer conductor, which are on the same side as the short-circuit end.
Preferably, a liquid seal groove is formed in the end face of the insulating medium disc, which is in contact with the open end, and a seal ring is placed in the liquid seal groove.
Preferably, the two opposite-phase signals output by the final stage of the external power source are directly connected with two transmission lines through two high-power transmission lines, one of the transmission lines is respectively connected with one end of the acceleration slits of all the basic coaxial resonant cavity units, and the other transmission line is respectively connected with the other end of the acceleration slits of all the basic coaxial resonant cavity units.
Or, the external power source is respectively connected with the two transmission lines through a one-to-two reverse phase power divider, and the final stage of the external power source outputs one path of signal.
Preferably, metal disks are respectively arranged outside the beam conduits on two sides of the insulating ceramic sleeve, good high-frequency contact is formed between the metal disks and the beam conduits or the inner conductors of the first or second resonant cavities corresponding to the beam conduits, and the metal disks are fixedly connected with the insulating ceramic sleeve.
Preferably, the frequency conversion non-tuned cavity structure further comprises a bracket for supporting the frequency conversion non-tuned cavity structure.
By adopting the technical scheme, the invention has the following advantages: 1. the invention provides a variable-frequency non-tuned cavity structure, which comprises at least two basic coaxial resonant cavity units which are arranged in parallel, wherein each basic coaxial resonant cavity unit comprises two resonant cavities which are coaxially connected and an acceleration gap positioned between the two resonant cavities; therefore, a variable-frequency non-tuned cavity structure with a large power broadband high-voltage magnetic alloy material loaded with multiple acceleration gaps is formed, and the working voltage and the acceleration gradient provided by the cavity can be effectively improved.
2. The resonant cavity is of a closed structure, the magnetic alloy ring is arranged in the resonant cavity, the cooling liquid is filled in the resonant cavity, the magnetic alloy ring is cooled in a direct cooling mode, and when the resonant cavity works under the high-voltage and high-power state, the temperature rise of a magnetic alloy material can be effectively controlled, so that the stability of the temperature and the performance of the magnetic alloy material is ensured; the damage of the magnetic alloy ring caused by the increase of the power loss is avoided, and the working voltage gradient is improved.
3. The invention distributes the power of the external power source to the accelerating seams of all basic coaxial resonant cavity units uniformly, which can effectively avoid the phenomena of ignition, breakdown and the like caused by overlarge working voltage; under the same frequency point and voltage, the frequency conversion non-tuning cavity has a more compact structure and a shorter longitudinal length, and the loading quantity of the magnetic alloy ring is reduced. The application of the method in the synchrotron can effectively save the limited longitudinal dimension of the synchrotron.
4. The invention is applied to the synchrotron, and can realize that the synchrotron outputs charged particle beams of high-energy heavy current ions, protons and the like or can accelerate the charged particle beams.
Drawings
FIG. 1 is a structural schematic diagram of a domestic existing magnetic alloy material loading frequency conversion non-tuned cavity;
FIG. 2 is a schematic diagram of the structure of a variable frequency non-tuned cavity of the present invention;
FIG. 3 is a schematic diagram of a frequency translating non-tuned cavity structure comprising three basic coaxial resonant cavity units;
FIG. 4 is a schematic sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of the cross-sectional structure taken along line B-B in FIG. 3;
fig. 6 is an isometric schematic view of the structure of fig. 3.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 2 to 6, the present invention provides a frequency conversion non-tuned cavity structure, which includes: at least two basic coaxial resonant cavity units 1 arranged in sequence; each basic coaxial resonant cavity unit 1 includes a resonant cavity 11 and a resonant cavity 12 which are connected in a coaxial manner, and an acceleration gap 13 which is disposed between the resonant cavity 11 and the resonant cavity 12 in a coaxial manner; beam pipelines 14 are coaxially arranged in the resonant cavity 11 and the resonant cavity 12, the beam pipelines 14 in the resonant cavity 11 and the beam pipelines 14 in the resonant cavity 12 are arranged at intervals in the acceleration gap 13, so that an acceleration slit 15 in the basic coaxial resonant cavity 1 is formed, a ceramic insulating sleeve 16 is sleeved outside the acceleration slit 15, and two ends of the insulating ceramic sleeve 16 are respectively connected with the end parts of the beam pipelines 14 on the corresponding sides; beam pipelines 14 between two adjacent basic coaxial resonant cavity units 1 are connected with each other;
the external power source 2 is connected with the accelerating slits 15 in all the coaxial resonant cavity units 1 through a transmission line, so that the power output by the external power source 2 is simultaneously fed into all the basic coaxial resonant cavity units 1 and is loaded at both ends of the accelerating slits 15 in each basic coaxial resonant cavity unit 1.
When the frequency conversion non-tuned cavity structure is used, the output power of an external power source 2 is simultaneously fed into all basic coaxial resonant cavity units 1 through a transmission line and is loaded at two ends of an acceleration slit 15 in each basic coaxial resonant cavity unit 1, so that a radio frequency electric field required by operation beams is formed in each acceleration slit 15, and the acceleration gradient in the frequency conversion non-tuned cavity structure and the highest working voltage which can be provided are effectively improved.
Further, the resonant cavity 11 and the resonant cavity 12 have the same structure, and both include:
an inner conductor 102, a cylindrical cavity is formed in the inner conductor 102, and the beam current pipeline 14 is installed in the cylindrical cavity in the inner conductor 102;
an outer conductor 101 provided outside the inner conductor 102;
a plurality of magnetic alloy rings 103, which are arranged between the inner conductor 102 and the outer conductor 101 and are distributed at intervals along the axial direction of the beam pipeline 14;
the inner conductor 102 and the outer conductor 101 are sealed at two axial end faces, so that a sealed resonant cavity 11 and a closed resonant cavity 12 are formed, and the resonant cavity 11 and the resonant cavity 12 are filled with cooling liquid;
the magnetic alloy ring body 103 is cooled in a direct cooling mode, so that the temperature of the magnetic alloy ring body 103 can be effectively reduced in time, the damage to the magnetic alloy ring body 103 caused by the increase of power loss is avoided, and the working voltage gradient is improved; the resonant cavity can normally work in the states of high voltage gradient (more than 20kV/m), high power density (more than or equal to 0.4W/cc) and broadband (more than or equal to 5 frequency doubling).
Further, a cooling liquid inlet 4 and a cooling liquid outlet 3 are arranged on the outer conductors 101 of the resonant cavity 11 and the resonant cavity 12, so that cooling liquid can be conveniently added into the resonant cavity 11 and the resonant cavity 12, and the cooling liquid can fully flow. The liquid leakage valve 5 and the gas outlet valve 6 are arranged on the outer conductors 101 of the resonant cavity 11 and the resonant cavity 12.
Furthermore, the resonant cavity 11 and the resonant cavity 12 have the same structure, and are both quarter-wavelength coaxial resonant cavities, and the short-circuit ends 7 of the resonant cavity 11 and the resonant cavity 12 are in good high-frequency contact with the inner and outer conductors of the resonant cavity 11 and the resonant cavity 12; the open end of the resonant cavity 11 and the open end 8 of the resonant cavity 12 are arranged in opposite directions, the open ends of the resonant cavity 11 and the resonant cavity 12 are both sealed by an insulating medium disc 9, and a through hole for a beam pipeline 14 to pass through is formed in the insulating medium disc 9; the acceleration gap 13 is located between the open end 8 of the resonant cavity 11 and the open end 8 of the resonant cavity 12, and the outer conductor of the acceleration gap 13 and the outer conductor 101 of the resonant cavities 11 and 12 are in good high-frequency contact.
Further, the number of the magnetic alloy rings 103 in the resonant cavity 11 and the resonant cavity 12 is the same, the magnetic alloy rings 103 are sequentially distributed from the open end 8 to the short end 7 in the resonant cavity 11 or the resonant cavity 12 at intervals according to the performance of the magnetic alloy rings from high to low, and the size number and the performance index of the magnetic alloy rings 103 are determined according to the specific design requirement of the resonant cavity.
Further, the beam current pipe 14 is installed in a cylindrical cavity in the inner conductor 102, and the beam current pipe is required to be fixed with the cylindrical cavity after the position of the beam current pipe is determined, and the specific fixing method is determined according to specific situations; good high frequency contact is made between the beam pipe 14 and the short-circuited ends of the resonant cavities 11 and 12 corresponding thereto.
Further, the high-frequency contact can be realized by a way of slotting and adding a high-frequency spring.
Furthermore, a short-circuit end plate 10 is arranged at one end between the inner conductor 102 and the outer conductor 101, so as to form a short-circuit end 7 on the resonant cavity 11 and the resonant cavity 12, an accommodating groove (not shown in the figure) is formed on the end surfaces of the outer conductor 101 and the inner conductor 102 on the same side as the short-circuit end 7, a high-frequency spring is placed in the accommodating groove, and the short-circuit end plate 10 is tightly pressed on the end surfaces of the inner conductor 102 and the outer conductor 101 on the same side; because the high-frequency spring is pressed to rebound, the end face of the short circuit end plate 10 is always in good contact with the end faces of the inner conductor 102 and the outer conductor 101, and therefore good high-frequency contact is formed between the resonant cavity 11 and the short circuit end 7 of the resonant cavity 12 and the inner and outer conductors of the resonant cavity;
furthermore, a liquid seal groove (not shown in the figure) is formed in the end face of the insulating medium disc 9, which is in contact with the open end 8, and a seal ring is placed in the liquid seal groove to ensure that the cooling liquid does not leak.
Further, the external power source 2 is directly coupled with the variable-frequency non-resonant cavity structure, specifically: two paths of opposite-phase signals output by the external power source 2 are directly connected with two transmission lines 21(BusBar) through two high-power transmission lines 20, wherein one transmission line 21 is respectively connected with one ends of the acceleration slits 15 of all the basic coaxial resonant cavity units 1, and the other transmission line 21 is respectively connected with the other ends of the acceleration slits 15 of all the basic coaxial resonant cavity units 1; in this way, the power required by the variable frequency non-resonant cavity structure can be fed into all the basic coaxial resonant cavity units 1 simultaneously in parallel through the transmission line 21; the index size and the like of the high-power transmission line are determined according to specific design requirements.
Further, the external power source 2 is connected to the two transmission lines 21 through a one-to-two inverting power divider, and a final-stage output signal of the external power source 2 is divided into two inverting signals through the one-to-two inverting power divider and transmitted into the two transmission lines 21.
Furthermore, two ends of the cermet welding 16 are respectively connected with the ends of the beam current pipes 14 on the corresponding sides by means of cermet welding.
Furthermore, a metal disc 17 is respectively arranged outside the beam tube 14 at two sides of the insulating ceramic sleeve 16, a good high-frequency contact is formed between the metal disc 17 and the beam tube 14 or the inner conductor 102 of the resonant cavity 11 or 12 corresponding to the beam tube, and the metal disc 17 and the insulating ceramic sleeve 16 are fixedly connected to facilitate the connection of a transmission line (BusBar) and other circuit structures.
Further, the present invention also includes a support 18 for supporting the variable frequency non-tuned cavity structure.
The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the respective members may be changed. On the basis of the technical scheme of the invention, the improvement or equivalent transformation of the individual components according to the principle of the invention is not excluded from the protection scope of the invention.
Claims (7)
1. A variable frequency non-tuned cavity structure, comprising:
at least two basic coaxial resonant cavity units (1); the basic coaxial resonant cavity units (1) are sequentially arranged in parallel; each of the basic coaxial resonant cavity units (1) comprises a first resonant cavity (11) and a second resonant cavity (12) which are coaxially connected, and an acceleration gap (13) which is coaxially arranged between the first resonant cavity (11) and the second resonant cavity (12); beam pipelines (14) are coaxially arranged in the first resonant cavity (11) and the second resonant cavity (12), the beam pipeline (14) in the first resonant cavity (11) and the beam pipeline (14) in the second resonant cavity (12) are arranged in the acceleration gap (13) at intervals to form an acceleration slit (15) in the basic coaxial resonant cavity unit (1), a ceramic insulating sleeve (16) is sleeved outside the acceleration slit (15), and two ends of the ceramic insulating sleeve (16) are respectively connected with the end parts of the beam pipelines (14) on the corresponding sides; the beam pipelines (14) between two adjacent basic coaxial resonant cavity units (1) are connected with each other;
an external power source (2) is connected with the accelerating slits (15) in all the basic coaxial resonant cavity units (1) through a transmission line, so that the power output by the final stage of the external power source (2) is simultaneously fed into all the basic coaxial resonant cavity units (1) and is loaded at two ends of the accelerating slits (15) in each basic coaxial resonant cavity unit (1);
the first resonant cavity (11) and the second resonant cavity (12) have the same structure and both comprise:
an inner conductor (102), a cylindrical cavity being formed in the inner conductor (102), the beam conduit (14) being mounted in the cylindrical cavity in the inner conductor (102);
an outer conductor (101) provided outside the inner conductor (102);
the magnetic alloy rings (103) are arranged between the inner conductor (102) and the outer conductor (101) and are distributed at intervals along the axial direction of the beam current pipeline (14);
the axial two end faces of the inner conductor (102) and the outer conductor (101) are closed to form a first closed resonant cavity (11) and a second closed resonant cavity (12), and cooling liquid is filled in the first resonant cavity (11) and the second resonant cavity (12);
arranging a short-circuit end plate (10) at one end between the inner conductor (102) and the outer conductor (101) so as to form a short-circuit end (7) on the first resonant cavity (11) or the first resonant cavity (12), arranging accommodating grooves on the end surfaces of the outer conductor (101) and the inner conductor (102) at the same side as the short-circuit end (7), placing high-frequency springs in the accommodating grooves, and tightly pressing the short-circuit end plate (10) on the end surfaces of the inner conductor (102) and the outer conductor (101) at the same side;
the first resonant cavity (11) and the second resonant cavity (12) both adopt quarter-wavelength coaxial resonant cavities, and the short-circuit ends (7) of the first resonant cavity (11) and the second resonant cavity (12) are in high-frequency contact with the inner and outer conductors of the first resonant cavity and the second resonant cavity; open ends (8) of the first resonant cavity (11) and the second resonant cavity (12) are arranged in opposite directions, the open ends of the first resonant cavity (11) and the second resonant cavity (12) are sealed by an insulating medium disc (9), and a through hole for a beam pipeline (14) to pass through is formed in the insulating medium disc (9); the acceleration gap (13) is positioned between the open end (8) of the first resonant cavity (11) and the open end (8) of the second resonant cavity (12), and good high-frequency contact is formed between the outer conductor of the acceleration gap (13) and the outer conductors (101) of the first resonant cavity (11) and the second resonant cavity (12); and good high-frequency contact is formed between the beam pipeline (14) and the short-circuit ends of the first resonant cavity (11) and the second resonant cavity (12) corresponding to the beam pipeline.
2. The variable frequency non-tuned cavity structure of claim 1, wherein: a cooling liquid inlet (4) and a cooling liquid outlet (3) are arranged on the outer conductors (101) of the first resonant cavity (11) and the second resonant cavity (12); and the outer conductors (101) of the first resonant cavity (11) and the second resonant cavity (12) are respectively provided with a liquid leakage valve (5) and a gas outlet valve (6).
3. The variable frequency non-tuned cavity structure of claim 1, wherein: the number of the magnetic alloy rings (103) in the first resonant cavity (11) and the second resonant cavity (12) is the same, and a plurality of magnetic alloy rings (103) are sequentially distributed at intervals from an open end (8) to a short end (7) in the first resonant cavity (11) or the second resonant cavity (12) from high to low according to the performance of the magnetic alloy rings.
4. The variable frequency non-tuned cavity structure of claim 1, wherein: and a liquid sealing groove is formed in the end face of the insulating medium disc (9) which is in contact with the open end (8), and a sealing ring is placed in the liquid sealing groove.
5. The variable frequency non-tuned cavity structure of claim 1, wherein: two paths of opposite-phase signals output by the last stage of the external power source (2) are directly connected with two transmission lines (21) through two high-power transmission lines (20), wherein one transmission line (21) is respectively connected with one ends of the acceleration slits (15) of all the basic coaxial resonant cavity units (1), and the other transmission line (21) is respectively connected with the other ends of the acceleration slits (15) of all the basic coaxial resonant cavity units (1);
or, the external power source (2) is respectively connected with the two transmission lines (21) through a one-to-two reverse phase power divider, and the final stage of the external power source (2) outputs one path of signal.
6. The variable frequency non-tuned cavity structure of claim 1, wherein: metal discs (17) are respectively arranged outside the beam pipelines (14) on two sides of the ceramic insulating sleeve (16), good high-frequency contact is formed between the metal discs (17) and the beam pipelines (14) or the inner conductors (102) of the first resonant cavity (11) or the second resonant cavity (12) corresponding to the metal discs, and the metal discs (17) are fixedly connected with the ceramic insulating sleeve (16).
7. A variable frequency non-tuned cavity structure according to any of claims 1 to 6, wherein: and a support (18) for supporting the variable frequency non-tuned cavity structure.
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| JPH0574358A (en) * | 1991-09-10 | 1993-03-26 | Uchu Tsushin Kiso Gijutsu Kenkyusho:Kk | Cavity connecting type traveling-wave tube |
| JP2007027001A (en) * | 2005-07-20 | 2007-02-01 | Natl Inst Of Radiological Sciences | High frequency acceleration cavity and apparatus |
| CN101715272A (en) * | 2009-08-13 | 2010-05-26 | 中国科学院近代物理研究所 | Loading and frequency conversion tuning cavity of large power ferrite |
| CN202435703U (en) * | 2011-12-10 | 2012-09-12 | 中国科学院近代物理研究所 | Variable-frequency tuned cavity |
| JP2014038774A (en) * | 2012-08-17 | 2014-02-27 | Mitsubishi Electric Corp | High-frequency acceleration cavity and manufacturing method for the same |
| CN207166844U (en) * | 2017-09-14 | 2018-03-30 | 北京长峰广播通讯设备有限责任公司 | Radio-frequency acceleration cavity |
| CN108684133A (en) * | 2018-06-22 | 2018-10-19 | 中国科学院上海应用物理研究所 | A kind of synchrotron radio frequency system and its frequency and chamber press regulation and control method |
| CN109275256A (en) * | 2018-11-05 | 2019-01-25 | 中国原子能科学研究院 | Radio frequency input coupler |
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