A waveguide system for medical linear accelerator

Abstract

The invention discloses a waveguide system for a medical linear accelerator, comprising: a first three-terminal circulator, a second three-terminal circulator, a forward wave sampling waveguide, a reverse wave sampling waveguide and a waveguide; the first three-terminal circulator is used to isolate the reflected wave from entering the waveguide to avoid sparking of the waveguide; the second three-terminal circulator is used to further isolate the magnetron from the waveguide system to ensure stable operation of the magnetron; the forward wave sampling waveguide is used to guide microwaves; the reverse wave sampling waveguide is used to guide microwaves; and the waveguide is used to guide microwaves. The waveguide system for a medical linear accelerator is isolated by two three-terminal circulators. The first three-terminal circulator close to the accelerating tube is used to isolate the reflected wave from entering the waveguide to avoid sparking of the waveguide; the second three-terminal circulator close to the magnetron further isolates the magnetron from the waveguide system to ensure stable operation of the magnetron.

Description

Technical Field

[0001] The present invention relates to the field of medical linear accelerators, and in particular to a waveguide system for medical linear accelerators. Background Art

[0002] The current waveguide system of accelerators is prone to sparking and unstable magnetron operation. Figure 1 As shown, the reason is that when the microwave energy reflected by the accelerating tube is strong, a strong electric field will be formed in the waveguide between the accelerating tube and the three-terminal circulator, causing the gas in the waveguide to ionize and form sparks. When the isolation of the three-terminal circulator is not good, the reflected wave energy enters the magnetron, causing the magnetron to spark or the output frequency to be unstable.

[0003] Currently, no effective solution has been proposed for the problems in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a waveguide system for a medical linear accelerator in view of the deficiencies in the prior art.

[0005] The waveguide system for a medical linear accelerator comprises a first three-end circulator, a second three-end circulator, a forward wave sampling waveguide, a reverse wave sampling waveguide and a waveguide;

[0006] The first three-terminal circulator is used to isolate the reflected wave from entering the waveguide to prevent the waveguide from sparking;

[0007] The second three-terminal circulator is used to further isolate the magnetron from the waveguide system, so that the magnetron works stably;

[0008] The forward wave sampling waveguide is used to guide microwaves;

[0009] The reverse wave sampling waveguide is used to guide microwaves;

[0010] The waveguide is used for guiding microwaves.

[0011] Further, the first end of the first three-terminal circulator is connected to the accelerating tube, the second end of the first three-terminal circulator is connected to the first end of the reverse wave sampling waveguide, the third end of the first three-terminal circulator is connected to the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected to the first end of the waveguide, the second end of the waveguide is connected to the first end of the second three-terminal circulator, and the third end of the second three-terminal circulator is connected to the magnetron.

[0012] Furthermore, the waveguide system for a medical linear accelerator also includes a first water load, and the first water load is used to absorb reverse wave power.

[0013] Further, the second end of the reverse wave sampling waveguide is connected to the first water load.

[0014] Furthermore, the waveguide system for a medical linear accelerator also includes a second water load, and the second water load is used to further absorb the reverse wave power.

[0015] Furthermore, the second end of the second three-terminal circulator is connected to the second water load.

[0016] Furthermore, the second water load and the first water load are both provided with cooling water circuits, and the cooling water circuits are connected to water cooling equipment through pipelines.

[0017] Furthermore, the reflected wave is the microwave power reflected back by the accelerating tube after the microwave generated by the magnetron is fed into the accelerating tube through the waveguide system.

[0018] Furthermore, the forward wave sampling waveguide also has a coupling output interface, which can couple out part of the forward wave.

[0019] Furthermore, the reverse wave sampling waveguide also has a coupling output interface, which can couple out part of the reverse wave.

[0020] Compared with the prior art, the waveguide system for medical linear accelerator of the present invention has the following remarkable advantages:

[0021] 1. The waveguide system for medical linear accelerator of the present invention adopts two three-terminal circulators for isolation. The function of the three-terminal isolator close to the accelerating tube is to isolate the reflected wave from entering the waveguide to avoid sparking of the waveguide.

[0022] 2. In the waveguide system for medical linear accelerator described in the present invention, the circulator close to the magnetron further isolates the magnetron from the waveguide system, so that the magnetron works stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a waveguide system of an accelerator in the prior art;

[0024] Figure 2 This is a schematic structural diagram of the waveguide system for a medical linear accelerator according to the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0030] In addition, the terms "installed", "set", "provided with", "connected", "slidingly connected", "fixed", "clipped", and "set" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the term "plurality" shall mean two or more.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] like Figure 2 As shown, the waveguide system for a medical linear accelerator comprises: a first three-terminal circulator, a second three-terminal circulator, a forward wave sampling waveguide, a reverse wave sampling waveguide, a waveguide, a first water load and a second water load;

[0034] The first three-terminal circulator is used to isolate the reflected wave from entering the waveguide to prevent the waveguide from sparking;

[0035] The second three-terminal circulator is used to further isolate the magnetron from the waveguide system, so that the magnetron works stably;

[0036] The forward wave sampling waveguide is used to guide microwaves and also has a coupling output interface, which can couple out part of the forward wave;

[0037] The reverse wave sampling waveguide is used to guide microwaves and also has a coupling output interface, which can couple out part of the reverse wave;

[0038] The waveguide is used to guide microwaves;

[0039] The first water load is used to absorb reverse wave power;

[0040] The second water load is used to further absorb the reverse wave power.

[0041] Specifically, two three-terminal circulators are used for isolation. The first three-terminal circulator close to the accelerating tube is used to isolate the reflected wave from entering the waveguide to prevent the waveguide from sparking. The second three-terminal circulator close to the magnetron further isolates the magnetron from the waveguide system to ensure stable operation of the magnetron.

[0042] Further, the first end of the first three-terminal circulator is connected to the accelerating tube, the second end of the first three-terminal circulator is connected to the first end of the reverse wave sampling waveguide, the third end of the first three-terminal circulator is connected to the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected to the first end of the waveguide, the second end of the waveguide is connected to the first end of the second three-terminal circulator, the third end of the second three-terminal circulator is connected to the magnetron, the second end of the reverse wave sampling waveguide is connected to the first water load, and the second end of the second three-terminal circulator is connected to the second water load.

[0043] Specifically, the first three-terminal circulator includes three ports, which is connected to the accelerating tube through the first port, connected to the reverse wave sampling waveguide through the second port, and connected to the forward wave sampling waveguide through the third port; the second three-terminal circulator also includes three ports, which is connected to the waveguide through the first port, connected to the second water load through the second port, and connected to the magnetron through the third port.

[0044] Furthermore, the second water load and the first water load are both provided with cooling water circuits, and the cooling water circuits are connected to water cooling equipment through pipelines.

[0045] Furthermore, the reflected wave is the microwave power reflected back by the accelerating tube after the microwave generated by the magnetron is fed into the accelerating tube through the waveguide system.

[0046] The working principle of the waveguide system for medical linear accelerator described in the present invention is:

[0047] The first end of the first three-terminal circulator is connected to the accelerating tube, the second end of the first three-terminal circulator is connected to the first end of the reverse wave sampling waveguide, the third end of the first three-terminal circulator is connected to the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected to the first end of the waveguide, the second end of the waveguide is connected to the first end of the second three-terminal circulator, the third end of the second three-terminal circulator is connected to the magnetron, the second end of the reverse wave sampling waveguide is connected to the first water load, the second end of the second three-terminal circulator is connected to the second water load, and two three-terminal circulators are used for isolation. The first three-terminal circulator is used to isolate the reflected wave from entering the waveguide to prevent the waveguide from sparking.

[0048] The second three-terminal circulator is used to further isolate the magnetron from the waveguide system, so that the magnetron works stably; the forward wave sampling waveguide is used to guide microwaves, and also has a coupling output interface, which can couple out part of the forward wave; the reverse wave sampling waveguide is used to guide microwaves, and also has a coupling output interface, which can couple out part of the reverse wave; the waveguide is used to guide microwaves; the first water load is used to absorb the reverse wave power; the second water load is used to further absorb the reverse wave power. The function of the three-terminal isolator close to the accelerating tube is to isolate the reflected wave from entering the waveguide to avoid sparking of the waveguide. The circulator close to the magnetron further isolates the magnetron from the waveguide system, so that the magnetron works stably.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A waveguide system for a medical linear accelerator, characterized in that: include: A first three-terminal circulator, a second three-terminal circulator, a forward wave sampling waveguide, a reverse wave sampling waveguide and a waveguide; The first three-terminal circulator is used to isolate the reflected wave from entering the waveguide to prevent the waveguide from sparking; The second three-terminal circulator is used to further isolate the magnetron from the waveguide system, so that the magnetron works stably; The forward wave sampling waveguide is used to guide microwaves; The reverse wave sampling waveguide is used to guide microwaves; The waveguide is used to guide microwaves; The first end of the first three-terminal circulator is connected to the accelerating tube, the second end of the first three-terminal circulator is connected to the first end of the reverse wave sampling waveguide, the third end of the first three-terminal circulator is connected to the first end of the forward wave sampling waveguide, the second end of the forward wave sampling waveguide is connected to the first end of the waveguide, the second end of the waveguide is connected to the first end of the second three-terminal circulator, and the third end of the second three-terminal circulator is connected to the magnetron.

2. The waveguide system for a medical linear accelerator according to claim 1, characterized in that: The waveguide system for a medical linear accelerator further includes a first water load, and the first water load is used to absorb reverse wave power.

3. The waveguide system for a medical linear accelerator according to claim 2, characterized in that: The second end of the reverse wave sampling waveguide is connected to the first water load.

4. The waveguide system for a medical linear accelerator according to claim 3, characterized in that: The waveguide system for a medical linear accelerator also includes a second water load, and the second water load is used to further absorb the reverse wave power.

5. The waveguide system for a medical linear accelerator according to claim 4, characterized in that: The second end of the second three-terminal circulator is connected to the second water load.

6. The waveguide system for a medical linear accelerator according to claim 5, characterized in that: The second water load and the first water load are both provided with cooling water circuits, and the cooling water circuits are connected to the water cooling equipment through pipelines.

7. The waveguide system for a medical linear accelerator according to claim 5, characterized in that: The reflected wave is the microwave power reflected back by the accelerating tube after the microwave generated by the magnetron is fed into the accelerating tube through the waveguide system.

8. The waveguide system for a medical linear accelerator according to claim 1, characterized in that: The forward wave sampling waveguide also has a coupling output interface, which can couple out part of the forward wave.

9. The waveguide system for a medical linear accelerator according to claim 1, characterized in that: The reverse wave sampling waveguide also has a coupling output interface, which can couple out part of the reverse wave.

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