Thin-walled vacuum tube and vacuum chamber

Abstract

The present disclosure provides a kind of thin-walled vacuum tube, comprising: pipeline, pipeline is bent along the direction of beam current circular arc, the cross-sectional shape of pipeline is oval;Reinforcing rib plate is clamped in the outer surface of thin-walled vacuum tube opposite two sides, and extends axially along the long axis direction of pipeline section;Reinforcing rib plate is equidistantly arranged on the outer surface of thin-walled vacuum tube.The present disclosure also provides a kind of vacuum chamber, which is composed of thin-walled vacuum tube splicing;Deflection diode electromagnet, at least one section of thin-walled vacuum tube is placed in the magnetic pole gap of deflection diode electromagnet.The cross section of pipeline is set as oval cross section, the height of reinforcing rib plate is reduced while the mechanical strength of thin-walled vacuum tube can be improved, and at the same time, reinforcing rib plate is arranged on the outer surface of pipeline opposite two sides, the gap of diode electromagnet magnetic pole can be reduced, and the manufacturing cost of electromagnet is reduced;Thin-walled vacuum tube is set as along the direction of beam current circular arc bending, which can better match the trajectory of beam current in deflection diode electromagnet.

Description

Technical Field

[0001] This disclosure relates to the field of accelerator vacuum, and more specifically, to a thin-walled vacuum tube and vacuum chamber. Background Technology

[0002] HIMM (Heavy Ion Medical Machine) is a carbon ion therapy device. Its main components include an isochronous cyclotron injector, a synchrotron with an acceleration energy up to 400 MeV / u, and beam transmission lines connected to five treatment terminals. The magnetic field excited by the electromagnets of the synchrotron is a time-varying magnetic field, which induces eddy currents in the metal vacuum chamber. The magnitude of the eddy currents is proportional to the wall thickness of the vacuum chamber. To reduce the influence of the magnetic field generated by the eddy currents on the beam, the vacuum chamber must be designed with a thin-walled structure; however, the thin-walled structure reduces the mechanical strength of the vacuum chamber. Furthermore, the vacuum chamber, constructed by splicing multiple segments of straight pipes to match the beam trajectory, has a cross-sectional dimension larger than the physical design requirements, further reducing its mechanical strength.

[0003] For large vacuum chambers, although using pipes with circular cross-sections can meet the requirements of withstanding atmospheric pressure, circular cross-section pipes not only waste space in the vacuum chamber, but also increase the gap between the electromagnet poles, which greatly increases the manufacturing and operating costs of the electromagnets. Summary of the Invention

[0004] In view of the above, one aspect of this disclosure provides a thin-walled vacuum tube, comprising: a pipe that is curved in an arc along the beam direction and has an elliptical cross-sectional shape; and reinforcing ribs disposed on opposite sides of the outer surface of the thin-walled vacuum tube and extending axially along the long axis of the pipe cross-section.

[0005] According to embodiments of this disclosure, in the pipe cross-section, the major axis of the ellipse is 10-300 mm, and the minor axis of the ellipse is 10-100 mm.

[0006] According to embodiments of this disclosure, the wall thickness of the thin-walled vacuum tube is 0.5 to 2 mm.

[0007] According to embodiments of this disclosure, the spacing between the reinforcing ribs is 5 to 50 mm, and the thickness of the reinforcing ribs is 1 to 4 mm.

[0008] According to embodiments of this disclosure, the ends of the thin-walled vacuum tube are provided with rolled edges.

[0009] Another aspect of this disclosure provides a vacuum chamber, comprising: the aforementioned thin-walled vacuum tubes, the vacuum chamber being composed of thin-walled vacuum tubes joined together; a deflecting dipolar electromagnet, wherein at least one section of the thin-walled vacuum tube is placed in the magnetic pole gap of the deflecting dipolar electromagnet.

[0010] According to an embodiment of this disclosure, the two ends of the vacuum chamber extending from the deflecting dipolar electromagnet are provided with bellows assemblies.

[0011] According to embodiments of this disclosure, the gap between the poles of the deflecting diode electromagnet is 20–100 mm, the deflection radius is 500–5000 mm, and the deflection angle is 5–90°; the bending radius and bending angle of the vacuum chamber, which is composed of thin-walled vacuum tubes, are the same as the deflection radius and deflection angle of the deflecting diode electromagnet.

[0012] According to embodiments of this disclosure, the bellows assembly includes a bellows and a connecting pipe. One end of the bellows is connected to a thin-walled vacuum tube via the connecting pipe, and the other end of the bellows is fixedly connected to a vacuum knife-edge flange via the connecting pipe.

[0013] According to embodiments of this disclosure, the bellows, connecting pipes, and vacuum blade flanges are connected by gas-tight argon arc welding, electron beam welding, or laser welding.

[0014] The above-described at least one technical solution adopted in the embodiments of this disclosure can achieve the following beneficial effects:

[0015] Setting the cross-section of the thin-walled vacuum tube to an elliptical shape reduces the height of the reinforcing ribs while increasing the mechanical strength of the tube. Furthermore, the reinforcing ribs are positioned on opposite sides of the outer surface of the tube and extend axially along the long axis of the tube cross-section, further reducing the gap between the deflecting diode electromagnet poles. This reduces manufacturing costs and improves safety. Setting the thin-walled vacuum tube to be curved in an arc along the beam direction better matches the beam trajectory within the deflecting diode electromagnet, avoiding the need to enlarge the cross-sectional dimensions of the tube to match the beam trajectory when the tube is spliced ​​in a straight line. Attached Figure Description

[0016] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 The schematic diagram shows a top view of a vacuum chamber composed of thin-walled vacuum tubes according to an embodiment of the present disclosure;

[0018] Figure 2 A schematic side cross-sectional view of a thin-walled vacuum tube according to an embodiment of the present disclosure is shown.

[0019] Figure 3 The diagram illustrates a top view of a thin-walled vacuum tube portion according to an embodiment of the present disclosure.

[0020] Explanation of reference numerals in the attached drawings: 1. Vacuum chamber; 2. Deflecting dipolar electromagnet; 3. Bellows assembly; 1-1. Pipe; 1-2. Reinforcing rib. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In the description of this invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the subsystem or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Throughout the accompanying drawings, identical elements are represented by the same or similar reference numerals. Conventional structures or configurations may be omitted where they might cause confusion in understanding the invention. Furthermore, the shapes, sizes, and positional relationships of the components in the drawings do not reflect actual size, scale, or actual positional relationships. Additionally, any reference numerals placed between parentheses in the claims should not be construed as limiting the claims.

[0026] Similarly, to simplify the invention and aid in understanding one or more of the various disclosed aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. The use of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] Figure 1 The diagram illustrates a top view of a vacuum chamber composed of thin-walled vacuum tubes according to an embodiment of the present disclosure.

[0029] like Figure 1 As shown, one aspect of this disclosure provides a thin-walled vacuum tube, specifically including: a pipe 1-1, which is curved in an arc along the beam direction and has an elliptical cross-sectional shape; and reinforcing ribs, which are disposed on opposite sides of the outer surface of the thin-walled vacuum tube and extend axially along the long axis of the cross-section of the pipe 1-1. Setting the pipe 1-1 to be curved in an arc along the beam direction better matches the trajectory of the beam in the deflecting diode electromagnet 2, and avoids increasing the cross-sectional size of the thin-walled vacuum tube to match the beam trajectory when the pipe 1-1 is a straight section.

[0030] In one embodiment of this disclosure, the major axis of the ellipse formed by the cross-section of pipe 1-1 is 10-300 mm, and the minor axis is 10-100 mm.

[0031] Figure 2 A schematic side cross-sectional view of a thin-walled vacuum tube according to an embodiment of the present disclosure is shown.

[0032] like Figure 2 As shown, setting the cross-section of pipe 1-1 to be elliptical can not only reduce the gap between the electromagnet poles, thus reducing the manufacturing cost of the electromagnet, but also save space in the vacuum chamber 1 composed of thin-walled vacuum tubes.

[0033] The wall thickness of the thin-walled vacuum tube is 0.5–2 mm. The thin-walled vacuum tube is used to provide a vacuum environment for the beam to pass through. Setting the tube 1-1 as a thin-walled structure can reduce the influence of the magnetic field excited by eddy currents on the beam.

[0034] Figure 3 The diagram illustrates a top view of a thin-walled vacuum tube portion according to an embodiment of the present disclosure.

[0035] like Figure 3 As shown, the spacing between the reinforcing ribs is 5-50mm, and the thickness of the reinforcing ribs is 1-4mm. Compared with the thin-walled vacuum tube with a racetrack-shaped cross-section of pipe 1-1, the embodiments of this disclosure can reduce the height of the reinforcing ribs while improving the mechanical strength of the thin-walled vacuum tube, preventing deformation of the vacuum pipe 1-1, and also effectively reducing the manufacturing cost of the reinforcing ribs.

[0036] Furthermore, the ends of the thin-walled vacuum tube are rolled up for use in connecting multiple vacuum tubes 1-1.

[0037] Another aspect of this disclosure provides a vacuum chamber 1, comprising: the aforementioned thin-walled vacuum tubes, wherein the vacuum chamber 1 is composed of spliced ​​thin-walled vacuum tubes; a deflecting diode electromagnet 2, wherein at least one section of the thin-walled vacuum tube is placed in the magnetic pole gap of the deflecting diode electromagnet 2. Corrugated pipe assemblies 3 are provided at both ends of the vacuum chamber 1 extending beyond the deflecting diode electromagnet. In some other embodiments of this disclosure, the thin-walled vacuum tubes can also be welded to form the vacuum chamber 1 using a gas-tight argon arc welding connection method.

[0038] In one embodiment of this disclosure, the gap between the poles of the deflecting diode electromagnet is 20–100 mm, the deflection radius is 500–5000 mm, and the deflection angle is 5–90°; the bending radius and bending angle of the vacuum chamber 1, which is composed of thin-walled vacuum tubes, are the same as those of the deflection radius and deflection angle of the deflecting diode electromagnet. At least one section of thin-walled vacuum tube is provided between the poles of the deflecting diode electromagnet.

[0039] The bellows assembly 3 includes a bellows and a connecting pipe. One end of the bellows is connected to a thin-walled vacuum tube via the connecting pipe, and the other end of the bellows is fixedly connected to a vacuum knife-edge flange via the connecting pipe. The bellows can be hydraulic or welded, and the type can be selected based on the specific application. The knife-edge flange is a metal-sealed flange used in high and ultra-high vacuum applications. In some other embodiments of this disclosure, the cross-sectional shape of the bellows can be selected based on the specific application, and no limitation is made here.

[0040] The bellows, connecting pipes, and vacuum blade flanges can be connected using gas-tight argon arc welding, electron beam welding, or laser welding. These three welding methods are commonly used in vacuum systems. Gas-tight argon arc welding involves continuously supplying argon gas during the welding process, protecting the weld seam from oxidation. Electron beam welding uses an accelerated and focused electron beam to bombard the vacuum welding surface, melting the workpiece to achieve welding. Laser welding uses a high-energy-density laser beam as a heat source to melt the workpiece. In practical applications, one of these three welding methods can be selected as the connection method.

[0041] In summary, the embodiments of this disclosure provide a thin-walled vacuum tube and a vacuum chamber. By setting the cross-section of the thin-walled vacuum tube to an elliptical cross-section, the height of the reinforcing ribs is reduced while the mechanical strength of the thin-walled vacuum tube is improved. At the same time, the reinforcing ribs are arranged on both sides of the outer surface of the thin-walled vacuum tube, which can further reduce the gap between the poles of the deflecting diode electromagnet based on the existing technical solution. This not only reduces the manufacturing cost of the electromagnet but also achieves higher safety. Setting the thin-walled vacuum tube to be curved in an arc along the beam direction can better match the trajectory of the beam in the deflecting diode electromagnet, and the cross-sectional size of the thin-walled vacuum tube will not be increased to match the beam trajectory when the pipe is spliced ​​in a straight line.

[0042] The specific embodiments described above provide a more detailed explanation of the technical solution of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thin-walled vacuum tube, characterized in that, include: The pipe (1-1) is curved in an arc along the beam direction to match the trajectory of the beam in the deflecting dipolar electromagnet (2); the cross-sectional shape of the pipe (1-1) is elliptical. The reinforcing ribs are sandwiched on opposite sides of the outer surface of the thin-walled vacuum tube and extend axially along the long axis of the cross section of the tube (1-1) to reduce the magnetic pole gap of the deflecting electromagnet (2); the reinforcing ribs are arranged at equal intervals on the outer surface of the thin-walled vacuum tube. The thin-walled vacuum tube has a pipe (1-1) cross-section set to an elliptical cross-section to reduce the height of the reinforcing rib and improve the mechanical strength of the thin-walled vacuum tube. The wall thickness of the thin-walled vacuum tube is 0.5~2mm.

2. The thin-walled vacuum tube according to claim 1, characterized in that, In the cross-section of the pipe (1-1), the major axis of the ellipse is 10~300mm and the minor axis of the ellipse is 10~100mm.

3. The thin-walled vacuum tube according to claim 1, characterized in that, The reinforcing ribs are spaced 5 to 50 mm apart, and the thickness of the reinforcing ribs is 1 to 4 mm.

4. The thin-walled vacuum tube according to claim 1, characterized in that, The ends of the thin-walled vacuum tube are rolled.

5. A vacuum chamber, characterized in that, include: At least one thin-walled vacuum tube as described in any one of claims 1 to 4, wherein at least one thin-walled vacuum tube is spliced ​​together to form an integral structure; A deflecting dipolar electromagnet (2), wherein at least one section of the thin-walled vacuum tube is placed in the magnetic pole gap of the deflecting dipolar electromagnet (2); A bellows assembly (3) is disposed at both ends of the vacuum chamber (1) extending out of the deflecting dipolar electromagnet.

6. The vacuum chamber according to claim 5, characterized in that, The gap between the poles of the deflecting dipolar electromagnet is 20~100mm, the deflection radius is 500~5000mm, and the deflection angle is 5~90°.

7. The vacuum chamber according to claim 5, characterized in that, The bending radius and bending angle of the vacuum chamber, which is composed of thin-walled vacuum tubes, are the same as the deflection radius and deflection angle of the deflecting diode electromagnet.

8. The vacuum chamber according to claim 5, characterized in that, The bellows assembly (3) includes a bellows and a connecting pipe. One end of the bellows is connected to the thin-walled vacuum tube through the connecting pipe, and the other end of the bellows is fixedly connected to a vacuum knife flange through the connecting pipe.

9. The vacuum chamber according to claim 8, characterized in that, The bellows, the connecting pipe, and the vacuum blade flange are connected by airtight argon arc welding, electron beam welding, or laser welding.

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