CN117915541A - Guided wave system for medical linear accelerator - Google Patents
Guided wave system for medical linear accelerator Download PDFInfo
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- CN117915541A CN117915541A CN202410250177.0A CN202410250177A CN117915541A CN 117915541 A CN117915541 A CN 117915541A CN 202410250177 A CN202410250177 A CN 202410250177A CN 117915541 A CN117915541 A CN 117915541A
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- waveguide
- circulator
- wave
- guided wave
- magnetron
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- 238000005070 sampling Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses a guided wave system for a medical linear accelerator, which comprises: the device comprises a first three-end circulator, a second three-end circulator, a forward wave sampling waveguide, a backward wave sampling waveguide and a waveguide; the first three-terminal circulator is used for isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting; the second three-terminal circulator is used for further isolating the magnetron from the guided wave system so as to ensure that the magnetron works stably; the forward wave sampling waveguide is used for guiding microwaves; the backward wave sampling waveguide is used for guiding microwaves; and the waveguide is used for guiding microwaves. The guided wave system for the medical linear accelerator is isolated by adopting two three-terminal circulators. The first three-end circulator close to the accelerating tube has the function of isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting; the second three-terminal circulator close to the magnetron further isolates the magnetron from the guided wave system, so that the magnetron works stably.
Description
Technical Field
The invention relates to the field of medical linear accelerators, in particular to a guided wave system for a medical linear accelerator.
Background
The problems of ignition, unstable operation of the magnetron and the like easily occur in the existing guided wave system of the accelerator, as shown in fig. 1, because when the microwave energy reflected by the accelerating tube is strong, a strong electric field is formed in the waveguide between the accelerating tube and the three-terminal circulator, causing ionization of gas in the waveguide to form ignition. When the isolation of the three-terminal circulator is poor, reflected wave energy enters the magnetron, and the magnetron is ignited or the output frequency is unstable.
For the problems in the prior art, no effective solution has been proposed at present.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a guided wave system for a medical linear accelerator.
The guided wave system for the medical linear accelerator comprises a first three-end circulator, a second three-end circulator, a forward wave sampling waveguide, a backward wave sampling waveguide and a waveguide;
the first three-terminal circulator is used for isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting;
The second three-terminal circulator is used for further isolating a magnetron from the guided wave system so as to ensure that the magnetron works stably;
the forward wave sampling waveguide is used for guiding microwaves;
the backward wave sampling waveguide is used for guiding microwaves;
The waveguide is used for guiding microwaves.
Further, the first end of the first three-end circulator is connected with the accelerating tube, the second end of the first three-end circulator is connected with the first end of the backward wave sampling waveguide, the third end of the first three-end circulator is connected with the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected with the first end of the waveguide, the second end of the waveguide is connected with the first end of the second three-end circulator, and the third end of the second three-end circulator is connected with the magnetron.
Further, the guided wave system for a medical linac further comprises a first water load for absorbing reverse wave power.
Further, a second end of the inverted wave sampling waveguide is connected to the first water load.
Further, the guided wave system for a medical linac further comprises a second water load for further absorbing reverse wave power.
Further, a second end of the second three-terminal circulator is connected to the second water load.
Further, the second water load and the first water load are both provided with cooling waterways, and the cooling waterways are connected with water cooling equipment through pipelines.
Further, the reflected wave is microwave power reflected by the accelerating tube after microwaves generated by the magnetron are fed into the accelerating tube through the guided wave system.
Further, the forward wave sampling waveguide is also provided with an interface for coupling out, and can couple out part of the forward wave.
Further, the backward wave sampling waveguide is also provided with an interface for coupling out, and can couple out part of backward waves.
Compared with the prior art, the guided wave system for the medical linear accelerator has the following remarkable and superior effects:
1, the guided wave system for the medical linear accelerator adopts two three-terminal circulators for isolation. The three-terminal isolator close to the accelerating tube has the function of isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting.
2, The wave guiding system for the medical linear accelerator, disclosed by the invention, is characterized in that the circulator close to the magnetron further isolates the magnetron from the wave guiding system, so that the magnetron works stably.
Drawings
FIG. 1 is a schematic diagram of a prior art accelerator guided wave system;
Fig. 2 is a schematic diagram of a guided wave system for a medical linac according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "disposed," "provided," "connected," "slidingly connected," "secured," "clamped," and "sleeved" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 2, the guided wave system for a medical linac includes: the device comprises a first three-end circulator, a second three-end circulator, a forward wave sampling waveguide, a backward wave sampling waveguide, a first water load and a second water load;
the first three-terminal circulator is used for isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting;
The second three-terminal circulator is used for further isolating a magnetron from the guided wave system so as to ensure that the magnetron works stably;
the forward wave sampling waveguide is used for guiding microwaves and is also provided with an interface for coupling out, and part of forward waves can be coupled out;
the backward wave sampling waveguide is used for guiding microwaves and is also provided with an interface for coupling out, and part of backward waves can be coupled out;
The waveguide is used for guiding microwaves;
The first water load is used for absorbing reverse wave power;
the second water load is used for further absorbing reverse wave power.
Specifically, two three-terminal circulators are used for isolation. The first three-terminal circulator close to the accelerating tube has the function of isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting. The second three-terminal circulator close to the magnetron further isolates the magnetron from the guided wave system, so that the magnetron works stably.
Further, the first end of the first three-end circulator is connected with the accelerating tube, the second end of the first three-end circulator is connected with the first end of the backward wave sampling waveguide, the third end of the first three-end circulator is connected with the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected with the first end of the waveguide, the second end of the waveguide is connected with the first end of the second three-end circulator, the third end of the second three-end circulator is connected with the magnetron, the second end of the backward wave sampling waveguide is connected with the first water load, and the second end of the second three-end circulator is connected with the second water load.
Specifically, the first three-terminal circulator comprises three ports, is connected with the accelerating tube through a first port, is connected with the backward wave sampling waveguide through a second port and is connected with the forward wave sampling waveguide through a third port; the second three-terminal circulator also includes three ports, connected to the waveguide through a first port, connected to a second water load through a second port, and connected to the magnetron through a third port.
Further, the second water load and the first water load are both provided with cooling waterways, and the cooling waterways are connected with water cooling equipment through pipelines.
Further, the reflected wave is microwave power reflected by the accelerating tube after microwaves generated by the magnetron are fed into the accelerating tube through the guided wave system.
The working principle of the guided wave system for the medical linear accelerator is as follows:
The first end of the first three-end circulator is connected with the accelerating tube, the second end of the first three-end circulator is connected with the first end of the backward wave sampling waveguide, the third end of the first three-end circulator is connected with the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected with the first end of the waveguide, the second end of the waveguide is connected with the first end of the second three-end circulator, the third end of the second three-end circulator is connected with the magnetron, the second end of the backward wave sampling waveguide is connected with the first water load, and the second end of the second three-end circulator is connected with the second water load and is isolated by adopting two three-end circulators. The first three-terminal circulator is used for isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting.
The second three-terminal circulator is used for further isolating a magnetron from the guided wave system so as to ensure that the magnetron works stably; the forward wave sampling waveguide is used for guiding microwaves and is also provided with an interface for coupling out, and part of forward waves can be coupled out; the backward wave sampling waveguide is used for guiding microwaves and is also provided with an interface for coupling out, and part of backward waves can be coupled out; the waveguide is used for guiding microwaves; the first water load is used for absorbing reverse wave power; the second water load is used for further absorbing reverse wave power. The three-terminal isolator close to the accelerating tube has the function of isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting. The circulator near the magnetron further isolates the magnetron from the guided wave system, so that the magnetron works stably.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made by those skilled in the art without departing from the spirit and principles of the present invention, and any modifications, equivalent substitutions, improvements, etc. should be included in the scope of the present invention as defined in the appended claims.
Claims (10)
1. A guided wave system for a medical linac, comprising: the device comprises a first three-end circulator, a second three-end circulator, a forward wave sampling waveguide, a backward wave sampling waveguide and a waveguide;
the first three-terminal circulator is used for isolating reflected waves from entering the waveguide and avoiding the waveguide from igniting;
The second three-terminal circulator is used for further isolating a magnetron from the guided wave system so as to ensure that the magnetron works stably;
the forward wave sampling waveguide is used for guiding microwaves;
the backward wave sampling waveguide is used for guiding microwaves;
The waveguide is used for guiding microwaves.
2. The guided wave system for a medical linac according to claim 1, wherein a first end of the first three-terminal circulator is connected to an accelerating tube, a second end of the first three-terminal circulator is connected to a first end of the backward wave sampling waveguide, a third end of the first three-terminal circulator is connected to a first end of the forward wave sampling waveguide, a second end of the forward wave sampling waveguide is connected to a first end of the waveguide, a second end of the waveguide is connected to a first end of the second three-terminal circulator, and a third end of the second three-terminal circulator is connected to a magnetron.
3. The guided wave system for a medical linac of claim 2 further comprising a first water load for absorbing reverse wave power.
4. The guided wave system for a medical linac of claim 3 wherein the second end of the inverted wave sampling waveguide is connected to the first water load.
5. The guided wave system for a medical linac of claim 4 further comprising a second water load for further absorbing reverse wave power.
6. The guided wave system for a medical linac of claim 5, wherein a second end of the second three-terminal circulator is connected to the second water load.
7. The guided wave system for a medical linac according to claim 6, wherein the second water load and the first water load are each provided with a cooling water circuit connected to a water cooling device by a pipe.
8. The guided wave system for a medical linac according to claim 6, wherein the reflected wave is the microwave power reflected by the accelerating tube after the microwaves generated by the magnetron are fed into the accelerating tube through the guided wave system.
9. The guided wave system for a medical linac according to claim 1, wherein the forward wave sampling waveguide further has an out-coupling interface capable of coupling out part of the forward wave.
10. The guided wave system for a medical linac according to claim 1, wherein the inverted wave sampling waveguide further has an out-coupling interface capable of coupling out a portion of the inverted wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410250177.0A CN117915541A (en) | 2024-03-05 | 2024-03-05 | Guided wave system for medical linear accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410250177.0A CN117915541A (en) | 2024-03-05 | 2024-03-05 | Guided wave system for medical linear accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117915541A true CN117915541A (en) | 2024-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410250177.0A Pending CN117915541A (en) | 2024-03-05 | 2024-03-05 | Guided wave system for medical linear accelerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117915541A (en) |
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2024
- 2024-03-05 CN CN202410250177.0A patent/CN117915541A/en active Pending
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