CN112763795B - Side coupling cavity measuring device and side coupling cavity measuring method for coupling cavity accelerating structure - Google Patents
Side coupling cavity measuring device and side coupling cavity measuring method for coupling cavity accelerating structure Download PDFInfo
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- CN112763795B CN112763795B CN202011618129.0A CN202011618129A CN112763795B CN 112763795 B CN112763795 B CN 112763795B CN 202011618129 A CN202011618129 A CN 202011618129A CN 112763795 B CN112763795 B CN 112763795B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a side coupling cavity measuring device for a coupling cavity accelerating structure, which comprises: a network analyzer, a measuring part and a cable. Wherein the measuring part includes a main body and a coaxial line; the main body is a copper pipe with a groove; one end of the coaxial line is provided with a magnetic coupling ring; the coaxial line is positioned in the main body, and the magnetic coupling ring is positioned in the groove; the other end of the coaxial line is provided with a coaxial radio frequency connector; the coaxial radio frequency connector is connected with the network analyzer through the cable. According to the technical scheme, the grooves in the main body and the magnetic coupling rings in the grooves can achieve complete short circuit of the accelerating cavities on two sides of the side coupling cavity to be tested, and space can be reserved for the excitation and receiving device of the microwave signals, so that the test result of the side coupling cavity can be accurately obtained.
Description
Technical Field
The invention relates to the technical field of accelerators, in particular to a side coupling cavity measuring device and a side coupling cavity measuring method for a coupling cavity accelerating structure.
Background
The coupled cavity acceleration structure is a proton linear accelerator for accelerating a proton beam from several tens of MeV to several hundreds of MeV in energy. The cavity accelerating structure generally includes a plurality of accelerating cavities, edge-coupled cavities, bridge couplers, and end-coupled cavities. In the coupled cavity accelerating structure, two adjacent accelerating cavities are communicated through an edge coupled cavity. In order to enable microwaves to enter each accelerating cavity through the transmission of the side coupling cavity and establish a designed accelerating electric field in each accelerating cavity, the cavity frequency and other parameters of the accelerating cavities and the side coupling cavities need to meet the design requirements, therefore, before the accelerating structure of the coupling cavity is used, the frequency and other parameters of each cavity in the accelerating structure of the coupling cavity need to be accurately tested, and the cavity needs to be tuned according to the test result, so that each cavity meets the design requirements.
In the related art, the testing and tuning of the cavity in the coupling cavity accelerating structure are mainly performed by a piston probe method. However, the piston probe method is mainly suitable for the case that all cavities are on the same axis. For the side coupling cavity in the coupling cavity accelerating structure, because the side coupling cavity and the accelerating cavity are not in the same axis, the piston probe method in the related art is difficult to obtain an accurate test result of the side coupling cavity.
Disclosure of Invention
The invention mainly aims to provide a side coupling cavity measuring device and a side coupling cavity measuring method for a coupling cavity accelerating structure, so as to accurately obtain a test result of a side coupling cavity.
In order to achieve the above object, the present invention provides an edge-coupled cavity measuring apparatus for a coupled cavity accelerating structure, comprising: a network analyzer, a measuring part and a cable. Wherein the measuring part includes a main body and a coaxial line; the main body is a copper pipe with a groove; one end of the coaxial line is provided with a magnetic coupling ring; the coaxial line is positioned in the main body, and the magnetic coupling ring is positioned in the groove; the other end of the coaxial line is provided with a coaxial radio frequency connector; the coaxial radio frequency connector is connected with the network analyzer through the cable.
Further, the measuring part further comprises a medium; the medium is located in the body; the coaxial line is fixed in the medium.
Further, the medium is made of polytetrafluoroethylene.
Further, the body includes a first extension, a second extension, and a third extension; the third extension part is positioned between the first extension part and the second extension part and connects the first extension part and the second extension part; the groove is located between the first extension and the second extension and corresponds to the third extension.
Further, the first extension includes a first axial end surface adjacent the second extension; the second extension includes a second axial end surface adjacent the first extension; the groove is located between the first axial end face and the second axial end face.
Further, the third extending part comprises a cambered surface and a top plane connected with the cambered surface; the cambered surface is positioned on the same circumferential surface with the outer surface of the first extension part and the outer surface of the second extension part; the top plane is positioned between the first axial end face and the second axial end face and is respectively connected with the first axial end face and the second axial end face; the recess is bounded by the top plane, the first axial end surface and the second axial end surface.
Further, the top plane is perpendicular to the first axial end face and the second axial end face.
Further, the third extension further comprises a groove recessed from the top plane to an interior of the third extension; the magnetic coupling ring is located in the groove and above or inside the groove.
Further, the medium is filled in the first extension part and the second extension part; the coaxial line is threaded through the medium in the first extension.
Further, a through hole is formed in the medium in the first extension.
Further, the length of the main body in the first direction is at least larger than the length of three accelerating cavities connected along the first direction in the coupling cavity accelerating structure in the first direction.
Further, the width of the groove in the first direction is smaller than the width of an acceleration gap of an acceleration cavity in a coupled cavity acceleration structure in the first direction.
Further, the network analyzer is an instrument with a reflection parameter measurement function.
Further, the network analyzer is a microwave vector network analyzer.
The invention also provides a side coupling cavity measuring method for testing the side coupling cavity in the coupling cavity accelerating structure by adopting the side coupling cavity measuring device, which comprises the following steps: connecting the coaxial line with the network analyzer; inserting the measuring part into a beam hole of a coupling cavity acceleration structure, and enabling the groove in the measuring part to be arranged in the middle of an acceleration cavity adjacent to a side coupling cavity to be measured, wherein the opening of the groove faces one side of the side coupling cavity to be measured; and adjusting parameters of the network analyzer to measure a reflection coefficient, and obtaining the resonant frequency of the side coupling cavity to be measured according to the measured reflection coefficient waveform.
Further, the step of inserting the measuring part into the beam-pass aperture of the coupling cavity accelerating structure comprises: inserting the measuring part into the beam-pass aperture of the coupling cavity accelerating structure along a first direction as a whole; wherein the beam-aperture traverses a plurality of acceleration cavities of the coupling cavity acceleration structure along the first direction.
Further, after the step of adjusting the parameter of the network analyzer to measure the reflection coefficient and obtain the resonant frequency of the side-coupled cavity to be measured according to the measured reflection coefficient waveform, the method further includes: moving the measuring part along the first direction until the groove in the measuring part is positioned between the adjacent accelerating cavities of the next side coupling cavity to be measured, and the opening of the groove faces one side of the next side coupling cavity to be measured; adjusting parameters of the network analyzer to measure a reflection coefficient S 11 And obtaining the resonant frequency of the next side coupling cavity to be measured according to the measured reflection coefficient waveform.
By applying the technical scheme of the invention, the grooves on the main body and the magnetic coupling rings in the grooves can realize the complete short circuit of the accelerating cavities on the two sides of the side coupling cavity to be tested, and can reserve space for the excitation and receiving device of the microwave signal, thereby accurately obtaining the test result of the side coupling cavity.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and will assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic diagram of an edge-coupled cavity measurement apparatus according to some embodiments of the present invention when applied to a coupled cavity acceleration structure;
FIG. 2 is an enlarged schematic view of the edge-coupled cavity measurement apparatus of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the edge-coupled cavity measurement apparatus of FIG. 2;
FIG. 4 is a flow chart of an edge-coupled cavity measurement method for a coupled cavity accelerating structure according to some embodiments of the invention.
It is to be noted that the drawings are not necessarily drawn to scale but are merely shown in a schematic manner which does not detract from the understanding of the reader.
Description of the reference numerals:
100. a coupling cavity accelerating structure; 110a, 110b, an acceleration chamber; 112. an acceleration gap; 130. a side coupling cavity; 150. a beam-current aperture; 210. a network analyzer; 230. a measuring section; 232. a main body; 2320. a first extension portion; 23201. a first axial end face; 2322. a second extension portion; 23220. a second axial end face; 2324. a third extension portion; 23240. a cambered surface; 23242. a top plane; 23246. a trench; 234. a medium; 236. a coaxial line; 237. a magnetic coupling ring; 238. a groove; 239. a through hole; 250. and (3) a cable.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. If the description refers to "first", "second", etc. throughout this document, these descriptions are only used for distinguishing similar objects, and should not be understood as indicating or implying relative importance, order or implied number of indicated technical features, it should be understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.
FIG. 1 is a schematic diagram of an edge-coupled cavity measurement apparatus according to some embodiments of the present invention as applied to a coupled cavity acceleration structure. As shown in fig. 1, the coupling cavity accelerating structure 100 includes a plurality of accelerating cavities 110a, 110b and a plurality of edge coupling cavities 130. The plurality of acceleration chambers 110a, 110b are sequentially connected along the first direction D1. The plurality of edge coupling cavities 130 are disposed at both sides of the plurality of acceleration cavities 110 in a second direction D2 substantially perpendicular to the first direction D1. Each side coupling cavity 130 is coupled to an adjacent accelerating cavity 110a, 110b for electromagnetically coupling the adjacent accelerating cavities 110a, 110b. The coupled-cavity accelerating structure 100 also includes a beam aperture 150 that extends through the plurality of accelerating cavities 110a, 110b along the first direction D1. Each acceleration chamber 110a, 110b communicates with a beam aperture 150 through an acceleration gap 112.
Embodiments of the present invention provide an edge-coupled cavity measurement apparatus and an edge-coupled cavity measurement method, which can be used to test the edge-coupled cavity 130 in the coupled cavity acceleration structure 100, so as to accurately obtain a test result of the edge-coupled cavity 130.
As shown in fig. 1, the edge-coupled cavity measuring apparatus includes a network analyzer 210, a measuring part 230, and a cable 250. The measuring portion 230 may be disposed in the beam-pass hole 150 and connected to the network analyzer 210 through a cable 250.
Specifically, the network analyzer 210 may employ an instrument having a reflection parameter measurement function. For example, the network analyzer 210 may employ a microwave vector network analyzer. The microwave vector network analyzer is a microwave network parameter measuring device and can measure reflection parameters, transmission parameters and the like.
As shown in fig. 2 and 3, measuring portion 230 includes a main body 232, a medium 234, and a coaxial line 236.
The main body 232 may be made of copper, etc., and has a substantially hollow tubular shape. In particular, the body 232 may be a copper tube having an outer diameter that is smaller than an inner diameter of the beam-pass aperture 150.
In the embodiment shown in fig. 2 and 3, the main body 232 includes a first extension 2320, a second extension 2322, and a third extension 2324. The first extension 2320 is a hollow tubular structure. The second extension 2322 is a hollow tubular structure. The third extension 2324 is located between the first extension 2320 and the second extension 2322 and connects the first extension 2320 and the second extension 2322.
In particular, the first extension 2320 includes a first axial end face 23201 adjacent to the second extension 2322. The second extension 2322 includes a second axial end face 23220 that is adjacent to the first extension 2320.
The third extension 2324 includes an arcuate surface 23240, a top planar surface 23242 connected to the arcuate surface 23240, and a groove 23246 recessed from the top planar surface 23242 towards the interior of the third extension 2324. The arc surface 23240 is located on the same circumferential plane as the outer surface of the first extension 2320 and the outer surface of the second extension 2322. The top planar surface 23242 is located between the first and second axial end surfaces 23201 and 23220 and is generally perpendicular to the first and second axial end surfaces 23201 and 23220. The top planar surface 23242 is connected to the bottom of the first and second axial end surfaces 23201 and 23220, respectively, thereby forming a groove 238 between the first and second extensions 2320 and 2322 and above the third extension 2324.
The width of the groove 238 in the axial direction of the body 232, i.e., the first direction D1, is smaller than the width of the acceleration gap 112 in the first direction D1.
In one embodiment, the length of the main body 232 in the axial direction, i.e., the first direction D1, is at least greater than the length of the three accelerating cavities 110. In the embodiment shown in fig. 1, the length of the body 232 in the axial direction thereof, i.e., the first direction D1, is greater than the length of the beam orifice 150 in the first direction D1, in other words, the body 232 may penetrate through the beam orifice 150.
A medium 234 is filled in the body 232. Specifically, the media 234 fills within the first and second extensions 2320 and 2322. In one embodiment, the media 234 may be polytetrafluoroethylene.
In one embodiment, the dielectric 234 is formed with a via 239 therein. The through hole 239 in the medium 234 inside the first extension 2320 may be used to accommodate the coaxial wire 236, and thus, the medium 234 inside the first extension 2320 may support and fix the coaxial wire 236. The through hole 239 in the media 234 within the second extension 2322 may reduce weight.
The above is a specific structure of the side-coupled cavity measuring apparatus in an embodiment of the present invention, and a method for measuring a side-coupled cavity by using the side-coupled cavity measuring apparatus to test the side-coupled cavity 130 in the coupling cavity acceleration structure 100 is briefly described below.
FIG. 4 is a flow chart of an edge-coupled cavity measurement method for a coupled cavity accelerating structure according to some embodiments of the invention. As shown in fig. 4, the side-coupled cavity measurement method includes:
step 401: connecting the coaxial rf connector of coaxial cable 236 to network analyzer 210;
step 402: inserting the measuring part 230 into the beam-passing hole 150 of the coupling cavity accelerating structure 100, and placing the groove 238 in the measuring part 230 in the middle of an adjacent accelerating cavity 110a of the side-coupling cavity 130 to be tested, with the opening of the groove 238 facing to the side of the side-coupling cavity 130 to be tested;
step 403: adjusting parameters of the network analyzer 210 to measure the reflection coefficient S 11 And obtains the resonant frequency of the side-coupled cavity 130 from the measured reflection coefficient waveform.
In step 401, the measuring part 230 may be inserted into the beam-aperture 150 of the coupling cavity accelerating structure 100 along the first direction D1 as a whole.
In step 402, since the main body 232 of the measuring part 230 passes through the acceleration cavities 110a and 110b on both sides of the side coupling cavity 130 to be measured, and the main body 232 may be made of copper, etc., the acceleration cavities 110a and 110b on both sides of the side coupling cavity 130 to be measured may be short-circuited. Thus, the magnetic coupling ring 237 located in the recess 238 of the main body 232 can only excite the side coupling cavity 130 to be tested. Thus, in step 403, the resonant frequency of the side-coupled cavity 130 can be obtained from the measured reflection coefficient waveform using the reflection parameter measurement function of the network analyzer 210.
In addition, after obtaining the resonant frequency of one of the side-coupled cavities 130, the side-coupled cavity measuring method may further include
Moving the measuring part 230 along the first direction D1 until the groove 238 in the measuring part 230 is positioned in the middle of the adjacent accelerating cavity 110a of the next edge-coupled cavity 130 to be measured, and the opening of the groove 238 faces to one side of the next edge-coupled cavity 130 to be measured;
adjusting parameters of the network analyzer 210 to measure the reflection coefficient S 11 And obtains the resonant frequency of the next side coupling cavity 130 to be measured according to the measured reflection coefficient waveform.
The above-mentioned edge-coupled cavity measuring apparatus and edge-coupled cavity measuring method for testing the edge-coupled cavity 130 in the coupled cavity accelerating structure 100 provided by the embodiment of the present invention are that the length of the main body 232 in the axial direction, i.e. the first direction D1, is at least greater than the lengths of the three accelerating cavities 110, and through the groove 238 on the main body 232 and the magnetic coupling ring 237 located in the groove 38, the accelerating cavities on both sides of the edge-coupled cavity to be tested can be completely short-circuited, and a space can be reserved for the excitation and reception apparatus of the microwave signal, so that the test result of the edge-coupled cavity 130 can be accurately obtained.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (13)
1. An edge-coupled cavity measurement device for a coupled cavity accelerating structure, comprising:
a network analyzer (210);
a measurement unit (230); and
a cable (250);
wherein the measurement portion (230) comprises a main body (232) and a coaxial line (236); the main body (232) is a copper pipe with a groove (238) formed; one end of the coaxial line (236) is provided with a magnetic coupling ring (237); the coaxial wire (236) is located in the main body (232) and the magnetic coupling ring (237) is located in the groove (238); the other end of the coaxial line (236) is provided with a coaxial radio frequency connector; the coaxial radio frequency connector is connected with the network analyzer (210) through the cable (250);
the main body (232) comprises a first extension (2320), a second extension (2322), and a third extension (2324); the third extension (2324) is located between the first extension (2320) and the second extension (2322) and connects the first extension (2320) and the second extension (2322); said groove (238) being located between said first extension (2320) and said second extension (2322) corresponding to said third extension (2324);
the first extension (2320) includes a first axial end face (23201) adjacent the second extension (2322); the second extension (2322) includes a second axial end face (23220) adjacent the first extension (2320); the groove (238) is located between the first axial end face (23201) and the second axial end face (23220);
the third extension part (2324) comprises a cambered surface (23240) and a top plane (23242) connected with the cambered surface (23240);
the cambered surface (23240) is located on the same circumferential plane as the outer surface of the first extension (2320) and the outer surface of the second extension (2322); the top planar surface (23242) is located between the first axial end surface (23201) and the second axial end surface (23220) and is connected with the first axial end surface (23201) and the second axial end surface (23220), respectively;
the groove (238) is bounded by the top planar surface (23242), the first axial end surface (23201), and the second axial end surface (23220);
the third extension (2324) further comprises a groove (23246) recessed from the top plane (23242) towards an interior of the third extension (2324);
the magnetic coupling ring (237) is located in the recess (238) and above or inside the groove (23246);
when the side coupling cavity measuring device is used for measuring the side coupling cavity, the opening of the groove faces to one side of the side coupling cavity to be measured.
2. The edge-coupled cavity measurement device of claim 1, wherein: the measuring part (230) further comprises a medium (234); the medium (234) is located in the body (232); the coaxial line (236) is fixed in the medium (234).
3. The edge-coupled cavity measurement device of claim 2, wherein: the medium (234) is made of polytetrafluoroethylene.
4. The edge-coupled cavity measurement device of claim 1, wherein: the top plane (23242) is perpendicular to the first axial end face (23201) and the second axial end face (23220).
5. The edge-coupled cavity measurement device of claim 2, wherein: the medium (234) is filled within the first extension (2320) and the second extension (2322); the coaxial wire (236) is threaded within the media (234) in the first extension (2320).
6. The edge-coupled cavity measurement device of claim 5, wherein: a through hole (39) is formed in the medium (234) in the first extension part (2320).
7. The edge-coupled cavity measurement device of claim 1, wherein: the length of the main body (232) in the first direction is at least larger than the length of three accelerating cavities connected along the first direction in the coupled cavity accelerating structure in the first direction.
8. The edge-coupled cavity measurement device of claim 7, wherein: the width of the groove (238) in the first direction is smaller than the width of an acceleration gap of an acceleration cavity in a coupling cavity acceleration structure in the first direction.
9. The edge-coupled cavity measurement device of claim 1, wherein: the network analyzer (210) is an instrument with a reflection parameter measurement function.
10. The edge-coupled cavity measurement device of claim 9, wherein: the network analyzer (210) is a microwave vector network analyzer.
11. An edge-coupled cavity measurement method for testing an edge-coupled cavity in a coupled cavity accelerating structure by using the edge-coupled cavity measurement device according to any one of claims 1 to 10, comprising:
connecting the coaxial line (236) with the network analyzer (210);
inserting the measuring part (230) into a beam hole of a coupling cavity acceleration structure, and enabling the groove (238) in the measuring part (230) to be arranged in the middle of an acceleration cavity adjacent to a side coupling cavity to be measured, wherein the opening of the groove (238) faces one side of the side coupling cavity to be measured;
and adjusting parameters of the network analyzer (210) to measure a reflection coefficient, and obtaining the resonant frequency of the side coupling cavity to be measured according to the measured reflection coefficient waveform.
12. The side-coupled cavity measurement method of claim 11, wherein: the step of inserting the measurement portion (230) into a beam-aperture of a coupling cavity accelerating structure comprises:
inserting the measuring portion (230) into the beam-aperture of the coupling cavity accelerating structure in its entirety along a first direction; wherein the beam-aperture traverses a plurality of acceleration cavities of the coupling cavity acceleration structure along the first direction.
13. The side-coupled cavity measurement method of claim 12, wherein: after the step of adjusting the parameters of the network analyzer (210) to measure the reflection coefficient and obtain the resonant frequency of the side-coupled cavity to be measured according to the measured reflection coefficient waveform, the method further comprises the following steps:
moving the measuring part (230) along the first direction until the groove (238) in the measuring part (230) is positioned in the middle of an accelerating cavity adjacent to the next side-coupled cavity to be measured, and the opening of the groove (238) faces to one side of the next side-coupled cavity to be measured;
adjusting a parameter of the network analyzer (210) to measure a reflection coefficient S 11 And obtaining the resonant frequency of the next side coupling cavity (130) to be measured according to the measured reflection coefficient waveform.
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| CN113365409B (en) * | 2021-05-19 | 2022-12-09 | 中国原子能科学研究院 | Traveling wave acceleration structure and electron accelerator |
| CN113329555A (en) * | 2021-05-19 | 2021-08-31 | 中国原子能科学研究院 | Standing wave accelerating tube and accelerating device |
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