CN211720806U - Rotary X-ray transmission conversion target for electronic accelerator - Google Patents
Rotary X-ray transmission conversion target for electronic accelerator Download PDFInfo
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- CN211720806U CN211720806U CN202020286136.4U CN202020286136U CN211720806U CN 211720806 U CN211720806 U CN 211720806U CN 202020286136 U CN202020286136 U CN 202020286136U CN 211720806 U CN211720806 U CN 211720806U
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Abstract
The utility model discloses a rotary X-ray transmission conversion target for an electronic accelerator, which comprises a vacuum cavity, a rotary target and a bearing component; the rotating target is arranged on the bearing assembly, and the bearing assembly drives the rotating target to do high-speed rotating motion in the vacuum cavity; the electron beam output from the accelerator bombards the outer edge of the target surface of the rotating target along a beam pipe of the vacuum cavity, part of energy is converted into X rays which are emitted to a working area through a transmission window on the vacuum cavity, and the residual energy is deposited to an annular area on the outer edge of the rotating target in the form of heat through the high-speed rotation of the rotating target. The utility model discloses a mode of high-speed rotation under the condition that does not change electron beam bombardment position, with the sedimentary power dispersion of electron beam to whole target to reduce the regional temperature of electron beam bombardment, avoid the conversion target ablation loss.
Description
Technical Field
The utility model relates to a particle accelerator equipment technical field, concretely relates to rotation type X ray transmission conversion target for electron accelerator.
Background
An electron accelerator is a device for generating X-rays, and is one of the most important components for industrial irradiation, radiotherapy, security imaging, and the like. After the electron accelerator accelerates the electrons to a certain energy (0.6-25MeV), the electrons bombard the target material and generate X rays by the principle of bremsstrahlung. The performance of the target determines the conversion efficiency, the energy spectrum and the power that can be tolerated for the X-rays.
Currently, X-ray conversion targets adopted by electron accelerators are all fixed, and for accelerators for imaging, an X-ray focal spot is required to be fixed, so that an electron beam needs to bombard a fixed position on a target surface. When the power of the electron beam is high, the temperature of the target surface is increased sharply, so that the target surface is ablated and even leaks are formed, the vacuum damage of the accelerator is caused, and the power of the accelerator is severely limited by the performance of the target.
SUMMERY OF THE UTILITY MODEL
In order to solve under the very big condition of accelerator output electron beam power density, fixed X ray conversion target causes the technical problem of target surface ablation damage, the utility model provides an electron accelerator is with rotation type X ray transmission conversion target. The utility model discloses a mode of high-speed rotation under the condition that does not change electron beam bombardment position, with the sedimentary power dispersion of electron beam to whole target to reduce the regional temperature of electron beam bombardment, avoid the rotatory target ablation loss of conversion.
The utility model discloses a following technical scheme realizes:
the rotary X-ray transmission conversion target for the electronic accelerator comprises a vacuum cavity, a rotary target and a bearing assembly; the rotating target is arranged on the bearing assembly, and the bearing assembly drives the rotating target to do high-speed rotating motion in the vacuum cavity; the electron beam output from the accelerator bombards the outer edge of the surface of the rotating target along the beam pipe, part of energy is converted into X-rays which are emitted to a working area through the transmission window, and the residual energy is deposited to an annular area on the outer edge of the rotating target in the form of heat through the high-speed rotation of the rotating target.
The utility model discloses a bearing assembly drives rotatory target high-speed rotation in the vacuum chamber, when the rotatory target of electron beam bombardment for the electron beam power of rigidity is deposited on the annular region of whole rotatory target, thereby reduces the regional temperature of electron beam bombardment, avoids the conversion target ablation to damage.
Preferably, the utility model discloses a rotatory target structural design is various, rotatory target can adopt the integral type structure, the target surface outer fringe of rotatory target is cut apart by a plurality of seams, and cuts apart the groove perpendicular to target surface or be the contained angle with the target surface, cuts apart the groove tip for circular near the center of the target surface.
Preferably, the rotary target of the utility model can also adopt a combined welding structure, which is convenient for processing; the rotary target comprises a target base body and a target conversion body; the target conversion body is connected to the outer periphery of the target base body by brazing.
Preferably, the utility model discloses a rotatory target still can be directly on the target surface and be located the electron beam deposition region and adopt the founding mode to form the conversion layer, the thickness of conversion layer is 0.1~2 mm.
Preferably, the utility model discloses a rotatory target still can be directly on the target surface and be located the electron beam deposition region and adopt the plasma spraying mode to form the conversion layer, the thickness of conversion layer is 0.02~2 mm.
Preferably, the outer edge of the target surface of the rotary target of the present invention can adopt a multi-layer ring-shaped or separated fan-shaped metal foil structure.
Preferably, the total thickness of the target in the electron beam bombardment area on the conversion target is 0.05-5 mm.
Preferably, the target material of the electron beam deposition region on the rotating target of the present invention is molybdenum, tungsten, rhenium, tantalum or rhenium-tungsten alloy.
Preferably, the utility model discloses the conversion target adopts and metal vacuum seal's diamond as the transmission window, the thickness of transmission window is less than 1 mm.
Preferably, the bearing assembly of the present invention employs, but is not limited to, a metal lubricated roller bearing, a liquid metal bearing, or a magnetic fluid bearing.
The utility model discloses have following advantage and beneficial effect:
1. the utility model discloses the mode of crossing high-speed rotation under the condition that does not change electron beam bombardment position, with the sedimentary power dispersion of electron beam to whole target to reduce the regional temperature of electron beam bombardment, avoid the conversion target ablation to damage.
2. The utility model discloses a rotation type X ray transmission conversion target can reduce the highest temperature of target surface several times, improves accelerator electron beam power density upper limit greatly, improve equipment availability factor or formation of image performance. The specific values depend on the electron beam parameters used, the design of the rotary target system structure and material selection, and the target rotation speed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view of the electron beam deposition area on a rotating target according to the present invention.
Fig. 2 is a schematic view of the overall structure of a conversion target according to a first embodiment of the present invention.
Fig. 3 is a schematic view of an overall structure of a conversion target according to a second embodiment of the present invention.
Fig. 4 is a schematic view of the overall structure of a conversion target according to a third embodiment of the present invention.
Fig. 5 is a schematic structural view of a rotary target according to a first embodiment of the present invention.
Fig. 6 is a schematic structural view of a rotary target according to a second embodiment of the present invention.
Fig. 7 is a schematic structural view of a rotary target according to a third embodiment of the present invention.
Fig. 8 is a schematic structural view of a rotary target according to a fourth embodiment of the present invention.
Reference numbers and corresponding part names in the drawings:
the device comprises a vacuum cavity 1, a rotating target 2, a target base 2-1, a target conversion body 2-2, a bearing assembly 3-1, a bearing rotor 3-2, a bearing driving sleeve 3-3, a bearing stator 4-electron beams, 5-X rays, a transmission window 6-7-segmentation grooves, a cylindrical bulge 8-9-installation holes, a driving coil 10-11-conversion layer 12-multilayer metal foils and a beam pipeline 13-beam.
Detailed Description
Hereinafter, the terms "include" or "may include" used in various embodiments of the present invention indicate the existence of the functions, operations or elements of the present invention, and do not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to refer only to the particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combination of the foregoing.
In various embodiments of the present invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
In this embodiment, a rotary X-ray transmission conversion target for an electron accelerator is provided, which disperses the power of electron beam deposition on the whole target by high-speed rotation without changing the electron beam bombardment position, so as to form an annular electron beam deposition region, such as a black annular region shown in fig. 1, on the target, thereby reducing the temperature of the electron beam bombardment region and avoiding the ablation damage of the conversion target.
As shown in fig. 2, the conversion target of the present embodiment includes: comprises a vacuum cavity 1, a rotating target 2 and a bearing assembly 3; the rotating target 2 is arranged on the bearing assembly 3, and the bearing assembly 3 drives the rotating target 2 to do high-speed rotating motion in the vacuum cavity 1; an electron beam 4 output from the accelerator bombards the outer edge of the target surface of the rotating target 2 along a beam pipe 13, part of energy is converted into X rays 5 which are emitted to a working area through a transmission window 6, and the residual energy is deposited to an annular area on the outer edge of the rotating target 2 in the form of heat through the high-speed rotation of the rotating target 2.
In the embodiment, the bearing assembly 3 includes a bearing rotor 3-1, a bearing driving sleeve 3-2 and a bearing stator 3-3; the rotating target 2 is arranged on a bearing rotor 3-1, a bearing stator 3-3 is fixed in a vacuum cavity 1, a bearing driving sleeve 3-2 rotates at a high speed under the driving of a driving coil 10 outside the vacuum cavity, so that the whole bearing rotor 3-1 and the rotating target 2 are driven to rotate at a high speed, and the electron beam power with a fixed position is deposited in an annular area through the high-speed rotation of the target.
In the present embodiment, the transmission window 6 (i.e. the X-ray output window) is made of diamond vacuum-sealed with metal, and the thickness of the transmission window 6 is preferably less than 1 mm.
In this embodiment, the bearing assembly 3 may be a metal-lubricated ball bearing or a liquid metal bearing, and the driving coil is cooled by, but not limited to, air cooling, water cooling, and oil cooling. In further preferred embodiments, the bearing assembly can also use magnetohydrodynamic bearings to drive the rotating target to rotate at high speeds.
In the present embodiment, the bearing assembly 3 and the beam conduit 13 for electron beam incidence are located on the same side of the vacuum chamber. The accelerator is suitable for the accelerator without space limitation or interference of other devices at the electron beam pipeline.
Example 2
The difference between this embodiment and embodiment 1 is that, as shown in fig. 3, the bearing assembly 3 and the beam conduit for electron beam incidence are located on different sides of the vacuum chamber, and this embodiment is suitable for an accelerator that has space limitation outside the beam conduit or requires interference of other devices.
In the case of the example 3, the following examples are given,
the difference between this embodiment and embodiment 2 is that, as shown in fig. 4, the bearing rotor of this embodiment is not parallel to the incident electron beam, i.e. the electron beam is incident at an angle, so that the interference of the coil on the electron beam tube or the X-ray path can be avoided, and the present embodiment is suitable for an accelerator with high requirements for the size miniaturization and weight reduction of the conversion target.
Example 4
In this embodiment, the rotating target in embodiments 1 to 3 is further optimized, the rotating target 2 of this embodiment adopts an integrated structure, as shown in fig. 5, the outer edge of the rotating target 2 (i.e. the electron beam bombardment region or the electron beam injection region) is divided by a plurality of slits, and the end of each slit near the center of the target surface is cut into a circle to form a dividing groove 7; the division is perpendicular to the target surface or at an angle to the target surface.
The thickness of the outer edge of the rotating target 2 in the embodiment is preferably 0.05-5 mm, and is smaller than the total thickness of the target substrate; the center of the rotating target 2 of the embodiment is provided with a mounting hole 8 for connecting with a bearing rotor or indirectly; one surface of the rotating target 2 of the embodiment is a cylindrical boss 9, and the cylindrical boss 9 is coaxial with the mounting hole 8 and is used for realizing the integrated processing of the rotating target 2.
The whole target material of the rotating target 2 of the present embodiment is molybdenum, tungsten, rhenium, tantalum or rhenium-tungsten alloy, but is not limited thereto.
Example 5
In this embodiment, the rotary target in embodiments 1 to 3 is further optimized, the rotary target 2 of this embodiment adopts an integrated structure, as shown in fig. 6, the rotary target substrate adopts but not limited to stainless steel, nickel, copper and copper alloy material, the conversion layer 11 is formed at the outer edge of the rotary target (i.e. the electron beam power deposition area) by but not limited to plasma spraying, and the conversion layer adopts but not limited to molybdenum, tungsten, rhenium, tantalum or tungsten rhenium alloy material, and the thickness is preferably 0.02-2 mm.
In another preferred embodiment, the conversion layer 11 can be formed by, but not limited to, fusion casting at the outer edge of the rotating target (i.e. the electron beam power deposition area), and the conversion layer is made of, but not limited to, molybdenum, tungsten, rhenium, tantalum or tungsten-rhenium alloy material, and the thickness is preferably 0.1-2 mm.
Example 6
This embodiment is further optimized for the rotary target of the above-mentioned embodiments 1-3, and the rotary target 2 of this embodiment adopts a combined welding structure, as shown in fig. 7, the rotary target 2 is composed of a target base 2-1 and a target converter 2-2, and the target converter is connected to the outer periphery of the target base 2-1 by means of, but not limited to, brazing.
In this embodiment, the target converter 2-2 is made of, but not limited to, molybdenum, tungsten, rhenium, tantalum or tungsten-rhenium alloy material, and the target substrate 2-1 is made of, but not limited to, stainless steel, nickel, copper or copper alloy material.
In another preferred embodiment, the target transition body is composed of multiple layers of annular or split fan-shaped metal foils 12, and the thickness of the target transition body multiple layers of metal foils 12 is less than 0.5mm, as shown in fig. 8.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The rotary X-ray transmission conversion target for the electronic accelerator is characterized by comprising a vacuum cavity (1), a rotary target (2) and a bearing assembly (3); the rotary target (2) is arranged on the bearing assembly (3), and the bearing assembly (3) drives the rotary target (2) to do high-speed rotary motion in the vacuum cavity (1); an electron beam (4) output from the accelerator bombards the outer edge of the target surface of the rotating target (2) along a beam pipeline (13), part of energy is converted into X rays (5) which are emitted to a working area through a transmission window (6), and the residual energy is deposited to an annular area on the outer edge of the rotating target (2) in the form of heat through the high-speed rotation of the rotating target (2).
2. The rotary X-ray transmission conversion target for the electronic accelerator according to claim 1, wherein the rotary target (2) is a one-piece structure, the outer edge of the target surface of the rotary target (2) is divided by a plurality of slits, the dividing groove (7) is perpendicular to the target surface or forms an included angle with the target surface, and the end part of the dividing groove close to the center of the target surface is cut into a circular shape.
3. The rotary X-ray transmission conversion target for an electron accelerator according to claim 1, wherein the rotary target (2) comprises a target base (2-1) and a target converter (2-2); the target conversion body (2-2) is connected to the outer periphery of the target base body (2-1) by brazing.
4. The rotary X-ray transmission conversion target for the electron accelerator as claimed in claim 1, wherein a conversion layer is formed on the target surface of the rotary target (2) and in the electron beam deposition region by fusion casting, and the thickness of the conversion layer is 0.1-2 mm.
5. The rotary X-ray transmission conversion target for the electron accelerator according to claim 1, wherein a conversion layer is formed on the target surface of the rotary target (2) and in the electron beam deposition region by plasma spraying, and the thickness of the conversion layer is 0.02-2 mm.
6. The rotary X-ray transmission conversion target for the electronic accelerator as claimed in claim 1, wherein the outer edge of the target surface of the rotary target (2) adopts a multi-layer ring-shaped or separated fan-shaped metal foil structure.
7. A rotary X-ray transmitting conversion target for an electron accelerator according to any of claims 1 to 6, wherein the total target thickness of the electron beam bombardment zone on the rotary target (2) is 0.05 to 5 mm.
8. A rotary X-ray transmission conversion target for an electron accelerator according to any of claims 1 to 6, wherein the target material of the electron beam deposition area on the rotary target (2) is molybdenum, tungsten, rhenium, tantalum or rhenium-tungsten alloy.
9. A rotary X-ray transmission conversion target for an electron accelerator according to any one of claims 1 to 6, characterized in that diamond vacuum-sealed with metal is used as the transmission window (6), and the thickness of the transmission window (6) is less than 1 mm.
10. A rotary X-ray transmission conversion target for an electronic accelerator according to any of claims 1 to 6, wherein the bearing assembly (3) is a metal lubricated roller bearing, a liquid metal bearing or a magnetic fluid bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020286136.4U CN211720806U (en) | 2020-03-10 | 2020-03-10 | Rotary X-ray transmission conversion target for electronic accelerator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020286136.4U CN211720806U (en) | 2020-03-10 | 2020-03-10 | Rotary X-ray transmission conversion target for electronic accelerator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965121A (en) * | 2021-02-03 | 2021-06-15 | 南京航空航天大学 | Radiation imaging security inspection system based on liquid metal random coding |
| CN114166122A (en) * | 2021-12-02 | 2022-03-11 | 中国工程物理研究院流体物理研究所 | Automatic target adjusting device |
-
2020
- 2020-03-10 CN CN202020286136.4U patent/CN211720806U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965121A (en) * | 2021-02-03 | 2021-06-15 | 南京航空航天大学 | Radiation imaging security inspection system based on liquid metal random coding |
| CN114166122A (en) * | 2021-12-02 | 2022-03-11 | 中国工程物理研究院流体物理研究所 | Automatic target adjusting device |
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