A RF shielding corrugated tube

Abstract

The present invention discloses an RF shielding bellows, comprising: a bellows body, a first flange arranged at one end thereof, a second flange arranged at the other end thereof, a beam inner tube penetrating therein and coaxial therewith, two light blocking blocks arranged on the inner wall of the beam inner tube and symmetrical about the central axis of the beam inner tube, a plurality of spring fingers located between the bellows body and the beam inner tube, and a plurality of contact fingers located between the other end of the beam inner tube and the second flange; one end of the beam inner tube is connected to the first flange, and the other end is spaced apart from the second flange; one end of the contact finger is fixed on the second flange, and the other end is overlapped on the other end of the beam inner tube; one end of the spring finger is fixed on the first flange, and the other end is inclined and extends in the direction toward the central axis of the beam inner tube and is pressed on the other end of the contact finger. The RF shielding bellows arranges the light blocking block on the inner wall of the beam inner tube, reduces the height of the light blocking block, thereby reducing impedance, and improving space utilization.

Description

Technical Field

[0001] The present application relates to the technical field of synchrotron radiation light shielding, and in particular to an RF shielding bellows. Background Art

[0002] There are two main types of vacuum bellows: welding bellows and hydraulic bellows. They can withstand the pressure difference caused by vacuum, and can also perform large tensile and compressive movements in the axial direction, and can withstand certain radial displacements. High-current accelerators require the installation of a large number of vacuum equipment, which will inevitably produce manufacturing errors during the production process, installation errors during the installation process, and alignment errors during the alignment process. The vacuum chamber will also expand and contract during baking and operation. The characteristics of the bellows can compensate for the above errors. Therefore, a large number of bellows need to be installed in the synchrotron radiation source.

[0003] In a high-current accelerator, the beam passes through a discontinuous vacuum pipe structure and generates an electromagnetic field in the surrounding environment, usually called a tail field. The tail field reacts on the beam, thereby disturbing the beam motion and even causing beam instability, limiting the improvement of beam quality. Impedance is the frequency domain expression of the tail field.

[0004] The radial dimension of the bellows varies greatly along the axial direction, and a very high impedance will be generated when the beam passes through. The high-order mode electromagnetic waves will accumulate energy and damage the bellows. Therefore, the bellows used in high-current synchrotron radiation sources have RF shielding structures inside. At the same time, relativistic electrons will generate synchrotron radiation light when passing through the deflection magnetic field. The shielding bellows located downstream of the deflection magnet will be irradiated and damage the shielding structure, so a light block must be designed upstream of the shielding structure. The current solution is to place the light block at the end of the upstream vacuum box. The light block is a certain distance away from the shielding structure, the height is relatively high, the impedance is large, and the space is limited in some special areas where the light block cannot be placed. At present, there are welds on the flange end face or inner surface of the shielding bellows, which limits the integration of the light block and the shielding bellows, and increases the system impedance. Summary of the invention

[0005] The present application aims to provide an RF shielding bellows, so as to set a light blocking block in a beam inner tube and reduce the height with respect to the beam inner tube, so as to reduce the impedance of the bellows and further reduce the overall impedance of the system.

[0006] The present application provides an RF shielding bellows, comprising:

[0007] Bellows body;

[0008] A first flange, which is provided at one end of the bellows body;

[0009] A second flange, which is provided at the other end of the bellows body;

[0010] A beam inner tube, which is inserted into the bellows body and coaxial with the bellows body; one end of the beam inner tube is connected to the first flange, and the other end is spaced apart from the second flange;

[0011] Two light blocking blocks in the same horizontal plane, the two light blocking blocks are arranged on the inner wall of the beam inner tube and are symmetrical about the central axis of the beam inner tube; the light blocking blocks have a light blocking surface for blocking synchrotron radiation light, the light blocking surface extends from one end of the beam inner tube, along the direction from one end to the other end of the beam inner tube, and is inclined toward the central axis direction;

[0012] A plurality of spring fingers, the plurality of spring fingers are located between the bellows body and the beam inner tube, the plurality of spring fingers are arranged in a circumferential array, one end of the spring finger is fixed to the first flange, and the other end is inclined and extends in a direction toward the central axis of the beam inner tube;

[0013] A plurality of contact fingers are provided, wherein the plurality of contact fingers are located between the other end of the beam inner tube and the second flange, and the plurality of contact fingers are arranged in a circular array; one end of the contact finger is fixed on the second flange, and the other end is overlapped on the other end of the beam inner tube; the other end of the spring finger is pressed on the other end of the contact finger; and the length direction of the contact finger is parallel to the axis direction of the beam inner tube.

[0014] Further, the RF shielding bellows, wherein the inner circle of the first flange extends horizontally toward the second flange and is spaced from the second flange to form an extension tube, the extension tube forms two protrusions from its inner tube wall toward the central axis direction, the two protrusions are symmetrical about the central axis of the extension tube, the protrusions have an inclined surface, the inclined surface extends from the first flange to the second flange and is inclined toward the central axis direction of the extension tube; the extension tube is formed as the beam inner tube, the central axis of the extension tube is the central axis of the beam inner tube, the protrusion is formed as the light blocking block, and the inclined surface is formed as the light blocking surface, so that the first flange, the beam inner tube, and the two light blocking blocks are an integrated structure.

[0015] Furthermore, in the RF shielding bellows, the light blocking block also has a connecting surface connected between the extended end of the light blocking surface and the inner wall of the beam inner tube; the angle between the light blocking surface and the beam passing through the beam inner tube is an obtuse angle, and the angle between the connecting surface and the beam passing through the beam inner tube is an acute angle.

[0016] Furthermore, in the RF shielding bellows, an annular ridge is provided on the outer wall of the other end of the beam inner tube, the top of the annular ridge is opposite to the other end of the spring finger, and the other end of the contact finger is overlapped on the annular ridge.

[0017] Furthermore, in the RF shielding bellows, the other end of the spring finger is curled into an arc shape, and the arc surface of the arc shape is pressed on the other end of the contact finger.

[0018] Furthermore, the RF shielding bellows, wherein, further comprises: a first cooling structure and a second cooling structure; the second flange is also connected to a tail pipe facing the first flange, the tail pipe is passed through the bellows body, and the tail pipe is spaced apart from the beam inner tube; the first cooling structure is arranged on the outer wall of the beam inner tube, the second cooling structure is arranged on the outer wall of the tail pipe, and one end of the contact finger is fixed on the tail pipe; the first cooling structure comprises: a first annular cooling cavity formed on the outer wall of the beam inner tube, and a first cooling medium inlet and a first cooling medium outlet opened on the first annular cooling cavity; the first cooling medium inlet is used to connect to the outlet of the cooling source, and the first cooling medium outlet is used to connect to the inlet of the cooling source; the second cooling structure comprises: a second annular cooling cavity formed on the outer wall of the tail pipe, and a second cooling medium inlet and a second cooling medium outlet opened on the second annular cooling cavity; the second cooling medium inlet is used to connect to the outlet of the cooling source, and the second cooling medium outlet is used to connect to the inlet of the cooling source.

[0019] Furthermore, the RF shielding bellows, wherein:

[0020] A first annular connection portion is provided on the outer wall of the beam inner tube, and a second annular connection portion is provided on the outer wall of the tail pipe; one end of the bellows body is connected to the first annular connection portion, and the other end is connected to the second annular connection portion; the first annular cooling cavity is located between the first annular connection portion and the first flange, and the first annular cooling cavity extends into the first flange; the second annular cooling cavity is located between the second annular connection portion and the second flange.

[0021] Furthermore, in the RF shielding bellows, an annular fixing piece is provided on the first annular connecting portion, the circumference of the annular fixing piece coincides with the circumference of one end of the plurality of spring fingers, and one end of the spring finger is fixed on the annular fixing piece.

[0022] Furthermore, the RF shielding bellows, wherein:

[0023] The first cooling structure further includes: a first cooling medium inlet pipe and a first cooling medium outlet pipe, wherein one end of the first cooling medium inlet pipe is connected to the first cooling medium inlet, and the other end is connected to the outlet of the cooling source; one end of the first cooling medium outlet pipe is connected to the first cooling medium outlet, and the other end is connected to the inlet of the cooling source;

[0024] The second cooling structure also includes: a second cooling medium inlet pipe and a second cooling medium outlet pipe, one end of the second cooling medium inlet pipe is connected to the second cooling medium inlet, and the other end is connected to the outlet of the cooling source; one end of the second cooling medium outlet pipe is connected to the second cooling medium outlet, and the other end is connected to the inlet of the cooling source.

[0025] Furthermore, in the RF shielding bellows, the spring fingers are pre-folded from nickel-based alloy sheets or stainless steel sheets.

[0026] The beneficial effects of the present invention are:

[0027] The RF shielding bellows provided in the present application includes: a bellows body; a first flange, which is arranged at one end of the bellows body; a second flange, which is arranged at the other end of the bellows body; a beam inner tube, which is passed through the bellows body and is coaxial with the bellows body; one end of the beam inner tube is connected to the first flange, and the other end is spaced apart from the second flange; two light blocking blocks in the same horizontal plane, the two light blocking blocks are arranged on the inner wall of the beam inner tube and are symmetrical about the central axis of the beam inner tube; the light blocking block has a light blocking surface for blocking synchrotron radiation light, and the light blocking surface extends from one end of the beam inner tube and along one end of the beam inner tube to the other end. , and are inclined toward the direction of the central axis of the inner beam tube; a plurality of spring fingers, the plurality of spring fingers are located between the bellows body and the inner beam tube, the plurality of spring fingers are arranged in a circumferential array, one end of the spring finger is fixed on the first flange, and the other end is inclined to extend toward the direction of the central axis of the inner beam tube; a plurality of contact fingers, the plurality of contact fingers are located between the other end of the inner beam tube and the second flange, the plurality of contact fingers are arranged in a circumferential array; one end of the contact finger is fixed on the second flange, and the other end is overlapped on the other end of the inner beam tube; the other end of the spring finger is pressed on the other end of the contact finger; the length direction of the contact finger is basically parallel to the axis direction of the inner beam tube. The RF shielding bellows sets the light blocking block on the inner wall of the inner beam tube, and reduces the height of the light blocking block, which can achieve the purpose of reducing impedance and improving space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A partial cross-sectional schematic diagram of the overall structure of the RF shielding bellows provided in this application;

[0029] Figure 2A schematic diagram of a partial three-dimensional structure of the RF shielding bellows provided in this application;

[0030] Figure 3 This is a schematic diagram of the local structure of the first flange, the beam inner tube, the light blocking block, and the first cooling structure in the RF shielding bellows provided in the present application. DETAILED DESCRIPTION

[0031] The present application is further described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0032] The RF shielding bellows provided by the present application is applied to a synchrotron radiation light source device. The storage ring vacuum chamber in the synchrotron radiation light source device usually has hundreds to hundreds of meters, divided into hundreds of sections, and the adjacent sections are connected by the RF shielding bellows to form a ring. The RF shielding bellows can absorb the change in the vacuum chamber caused by thermal expansion and contraction during the operation of the storage ring and the baking of the vacuum system, provide a working space for the connection of adjacent vacuum chamber sections, and compensate for the manufacturing and installation errors of the vacuum chamber. The high-intensity electron beam at a speed close to the speed of light passes through the interior of the beam inner tube in the RF shielding bellows, so that the particle beam induces a mirror current (also called wall current) of the same value on the beam inner tube, and the inner tube and the contact finger contact to form a wall current path to reduce the wall resistance of the bellows, and at the same time reduce the coupling impedance between the bellows and the beam inner tube, so as not to generate a high heat load on the bellows, and meet the use requirements of the storage ring. The light blocking block can block the synchrotron radiation light emitted along the tangent when the electron beam is deflected, so as to avoid deformation and failure caused by direct irradiation of the shielding structure.

[0033] See also Figure 1-Figure 3 As shown, this embodiment provides an RF shielding bellows, including: a bellows body 1, a first flange 2, a second flange 3, a beam inner tube 4, two light blocking blocks 5, a plurality of spring fingers 6, and a plurality of contact fingers 7.

[0034] The bellows body 1 has a certain degree of scalability. Figure 1 The first flange 2 is provided at the other end of the bellows body 1 (such as Figure 1The second flange 3 is arranged at the right end of the bellows body 1, the first flange 2 is used to connect with a vacuum chamber, and the second flange 3 is used to connect with another vacuum chamber. A vacuum chamber and another vacuum chamber are two adjacent vacuum chambers. In the storage ring, most of the two adjacent vacuum chambers are connected by flanges at both ends of the bellows body to form a closed storage ring. The particle beam passes along the central axis of the beam inner tube 4, and the beam inner tube 4 is arranged in the bellows body 1 and remains coaxial with the bellows body 1. One end of the beam inner tube 4 is connected to the first flange 2, and the other end maintains a positional relationship of interval arrangement with the second flange 3. The two light blocking blocks 5 are in the same horizontal plane, and the two light blocking blocks 5 are arranged on the inner wall of the beam inner tube 4 and are symmetrical about the central axis of the beam inner tube 4. Each light blocking block 5 has a light blocking surface 51 for blocking synchrotron radiation light, and the light blocking surface 51 extends from one end of the beam inner tube 4, along the direction from one end to the other end of the beam inner tube 4, and is inclined toward the central axis of the beam inner tube 4. A plurality of spring fingers 6 are arranged in a circular array between the bellows body 1 and the beam inner tube 4, and one end of each spring finger 6 is fixedly connected to the first flange 1, and the other end extends obliquely downward, that is, the other end of each spring finger 6 is inclined and extends in a direction toward the central axis of the beam inner tube 4. A plurality of contact fingers 7 are arranged in a circular array between the other end of the beam inner tube 4 and the second flange 3, and the length directions of all contact fingers 7 are parallel to the straight line where the axis of the beam inner tube 4 is located, and one end of all contact fingers 7 is fixed to the second flange 3, and the other end is overlapped on the other end of the beam inner tube 4. The other end of the spring finger 6 is pressed on the other end of the contact finger 7.

[0035] In the above embodiment, the light blocking block 5 is arranged on the inner wall of the beam inner tube 4, so as to reduce the height of the light blocking block 5, which can not only reduce the impedance of the beam inner tube 4 but also improve the space utilization.

[0036] In this embodiment, one end of the beam inner tube 4 is an end of the beam inner tube 4 close to the first flange 2 , and the other end is an end of the beam inner tube 4 close to the second flange 3 .

[0037] In the above embodiment, the number of spring fingers 6 and contact fingers 7 is consistent, and the positions correspond one to one. All the corresponding spring fingers 6 and contact fingers 7 always maintain contact relationship when the RF shielding bellows is compressed and stretched, forming a shielding envelope structure. The shielding envelope structure bridges the corrugated structure of the bellows body and constitutes a direct path for the mirror current. In this way, the wall current flows on the shielding envelope structure, and the envelope structure shields the corrugated structure of the bellows, thereby improving the continuity of the beam pipeline, reducing the excitation of high-order modes, and reducing the problem of high-order mode leakage. At the same time, the gaps between adjacent contact fingers 7 constitute gas channels inside and outside the envelope, which facilitates the extraction of gas in the corrugated structure.

[0038] The spring fingers 6 are pressed one by one evenly on the contact fingers 7, and the contact force between the contact fingers 7 and the beam inner tube is the same. The spring fingers 6 that apply the contact force and the beam inner tube 4 that bears the pressure are located on the same side, and the relative positions remain unchanged. The contact force will not change with the compression and stretching or bending of the bellows body 1. In the present application, the spring fingers 6 are pre-bent and formed by a nickel-based alloy sheet or a stainless steel sheet according to a pre-bending angle. That is, the spring fingers 6 are formed by bending the other end downward at a certain angle, and the certain angle is the pre-bending angle. The contact fingers 7 do not need to provide elastic force and can be made very thin, which is conducive to the spring fingers 6 to press it on the beam inner tube. Even if the bellows body is bent or the two ends are slightly eccentric, the contact force does not change much. The contact fingers 7 are slightly wider than the spring fingers 6 to avoid the bellows body 1 being twisted, the contact fingers 7 and the spring fingers 6 being relatively offset, affecting the contact force, or even the spring fingers 6 slipping off the contact fingers. At the same time, the spring fingers 6 cannot be too narrow, so as to provide a suitable spring force under a certain thickness and a certain pre-bending angle.

[0039] In the present application, in order to prevent the contact finger 7 from making two-point contact with the beam inner tube 4 when the bellows body 1 is bent or eccentric, forming two contact resistance points, resulting in overheating and discharge, a circle of annular ridges 41 is provided on the outer wall of the other end of the beam inner tube 4, and the top of the annular ridge 41 is directly opposite to the other end of the spring finger 6, and the other end of the contact finger 7 overlaps the top of the annular ridge 41, so that two-point contact will not be generated when the bellows body 1 is bent or eccentric. At the same time, the deformation of the bellows body 1 when bent or eccentric far exceeds the thermal expansion of the vacuum chamber. In this embodiment, the other end of the spring finger 6 is curled into an arc shape, and the arc surface of the arc is pressed on the other end of the contact finger 7, that is, pressed on the top of the annular ridge 41, to avoid two-point contact.

[0040] In the present application, the inner ring of the first flange 2 extends horizontally toward the second flange 3 and is arranged in a spaced position relationship with the second flange 3 to form an extension tube, and the extension tube forms two protrusions from the end of the extension tube overlapping with the inner ring of the first flange 2, and the two protrusions are symmetrical about the central axis of the extension tube, and the protrusion has an inclined surface, which extends from the end of the extension tube overlapping with the inner ring of the first flange 2, along the direction from one end of the extension tube to the other end, and is inclined toward the central axis of the extension tube. The central axis of the extension tube coincides with the central axis of the beam inner tube 4, and the extension tube is formed as the aforementioned beam inner tube 4, the protrusion is formed as the aforementioned light blocking block 5, and the inclined surface on the protrusion is formed as the aforementioned light blocking surface 5, so that the first flange 2, the beam inner tube 4, and the two light blocking blocks 5 form an integrated structure. In this way, the one-piece structure can be processed by a machining center. Compared with the traditional welding method, there is no need to weld one end of the beam inner tube 4 to the inner ring of the first flange 2 by welding (or other methods), and there is no need to weld the light blocking block 5 to the inner wall of the beam inner tube 4 by welding (or other methods). The connection between the various components has a smooth transition, which improves the surface finish and further reduces the impedance of the beam inner tube 4.

[0041] Continue to see Figure 1 As shown, the aforementioned light blocking block 5 also has a connecting surface 52, which is connected between the extended end of the light blocking surface 51 (i.e., the direction from the first flange to the second flange on the light blocking surface) and the inner wall of the beam inner tube 4. The angle formed between the aforementioned light blocking surface 51 and the particle beam passing through the beam inner tube 4 is an obtuse angle, and the angle formed between the connecting surface 52 and the particle beam passing through the beam inner tube 4 is an acute angle. In this way, the extended section of the light blocking surface 51 returns to a state flush with the inner wall of the beam inner tube 4 after extending a certain distance.

[0042] Continue to see Figure 1-Figure 3 As shown, the RF shielding structure provided by the present application also includes: a first cooling structure 8 and a second cooling structure 9. The second flange 3 is also connected to a tail pipe 31 facing the first flange 2, and the tail pipe 31 is also formed into an integrated structure with the second flange 3 by processing, and the tail pipe 31 is also penetrated in the corrugated tube body 1, and the tail pipe 31 and the beam inner tube 4 are kept in a spaced position relationship. The first cooling structure 8 is arranged on the outer wall of the beam inner tube 4, and the second cooling structure 9 is arranged on the outer wall of the tail pipe 31, and one end of the aforementioned contact finger 7 is fixed on the tail pipe 31.

[0043] The first cooling structure 8 includes: a first annular cooling cavity 81 formed on the outer wall of the beam inner tube 4, a first cooling medium inlet and a first cooling medium outlet provided on the first annular cooling cavity 81, and a first cooling medium inlet pipe 82 and a first cooling medium outlet pipe 83. One end of the first cooling medium inlet pipe 82 is connected to the first cooling medium inlet, and the other end is connected to the outlet of the cooling source. One end of the first cooling medium outlet pipe 83 is connected to the first cooling medium outlet, and the other end is connected to the inlet of the cooling source. In other words, the first cooling medium inlet is connected to the outlet of the cooling source through the first cooling medium inlet pipe 81, and the first cooling medium outlet is connected to the inlet of the cooling source through the first cooling medium outlet pipe 82, forming a closed structure for circulating the cooling medium.

[0044] The second cooling structure 9 includes: a second annular cooling cavity 91 formed on the outer wall of the tail pipe 31, a second cooling medium inlet and a second cooling medium outlet provided on the second annular cooling cavity 91, and a second cooling medium inlet pipe 92 and a second cooling medium outlet pipe 93. One end of the second cooling medium inlet pipe 92 is connected to the second cooling medium inlet, and the other end is connected to the outlet of the cooling source. One end of the second cooling medium outlet pipe 93 is connected to the second cooling medium outlet, and the other end is connected to the inlet of the cooling source. In other words, the second cooling medium inlet is connected to the outlet of the cooling source through the second cooling medium inlet pipe 92, and the second cooling medium outlet is connected to the inlet of the cooling source through the second cooling medium outlet pipe 93, forming a closed structure for circulating the cooling medium.

[0045] The cooling source used by the two cooling structures can be the same or different cooling sources. Similarly, the cooling medium circulating in the two cooling structures can be the same or different. In this embodiment, the two cooling structures use the same cooling source and the same cooling medium. The cooling medium is preferably cooling water to reduce costs.

[0046] A first annular connection portion 42 is also provided on the outer wall of the beam inner tube 4, and a second annular connection portion 32 is also provided on the outer wall of the tail tube 31. One end of the aforementioned bellows body 1 is connected to the first annular connection portion 42, and the other end of the bellows body 1 is connected to the second annular connection portion 32. The aforementioned first annular cooling cavity 81 is located between the first annular connection portion 42 and the first flange 2, and the first annular cooling cavity 81 extends into the first flange 2 to improve space utilization. The aforementioned second annular cooling cavity 91 is located between the second annular connection portion 32 and the second flange 3.

[0047] An annular fixing member 43 is also provided on the first annular connecting portion 42. The circumference of the annular fixing member 43 coincides with the circumference of one end of all spring fingers 6. One end of all spring fingers 6 is fixed to the annular fixing member 43. In the actual processing process, all spring fingers 6 are divided into two parts. The number of spring fingers 6 in the two parts is the same. One end of all spring fingers 6 in each part is connected into one piece. Then, the end of the spring fingers 6 connected into one piece is welded and fixed to the annular fixing member 43. In this way, the uniformity of welding can be ensured. After that, the annular fixing member 43 with the spring fingers 6 welded thereto is welded and fixed to the first annular connecting portion 42.

[0048] In some embodiments, the RF shielding bellows further comprises: at least one positioning structure, such as Figure 2 As shown, the positioning structure includes: two connecting plates 10 respectively arranged on the first annular connecting portion 42 and the second annular connecting portion 32, and a positioning rod 11. The two connecting plates 10 are provided with coaxial through holes, and the two ends of the positioning rod 11 are respectively penetrated in the two through holes, and both ends of the positioning rod 11 are provided with external threads, and the two ends of the positioning rod 11 are locked and positioned by two nuts. Of course, the locking positioning needs to ensure that the bellows body 1 is not in an over-stretched or over-compressed state, so as to prevent the bellows body 1 from being over-stretched during transportation, causing the contact finger 7 to fall out, or preventing the contact finger 7 from being over-compressed and causing deformation of the first annular connecting portion 32.

[0049] Of course, in other embodiments, a stretching limit pin 12 and a compression limit pin 13 may be provided on the positioning rod 11 to prevent excessive stretching or excessive compression. The stretching limit pin 12 is located on the outside of the connecting plate 10, and the compression limit pin 13 is located on the inside of the connecting plate 10. The outer stretching limit pin 12 prevents the bellows body 1 from being overstretched, and the inner compression limit pin 13 prevents the bellows body 13 from being overcompressed.

[0050] In summary, the RF shielding bellows provided in this embodiment sets the light blocking block on the inner wall of the beam inner tube to reduce the height of the light blocking block, which can achieve the purpose of reducing impedance and improving space utilization. The first flange, the beam inner tube, the light blocking block, and the water cooling structure are designed as an integrated process, so that the inner surface of the RF shielding bellows is free of welds, the surface finish is improved, and the impedance is reduced. At the same time, through the reasonable integration of the first flange and the first water cooling structure, the light blocking block is efficiently water-cooled while the space utilization is improved, so that the overall length of the shielding bellows can be shortened.

[0051] The above contents are further detailed descriptions of the present application in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the inventive concept of the present application.

Claims

1. An RF shielding bellows, characterized in that: include: Bellows body; A first flange, which is provided at one end of the bellows body; A second flange, which is provided at the other end of the bellows body; A beam inner tube, which is inserted into the bellows body and coaxial with the bellows body; one end of the beam inner tube is connected to the first flange, and the other end is spaced apart from the second flange; Two light blocking blocks in the same horizontal plane, the two light blocking blocks are arranged on the inner wall of the beam inner tube and are symmetrical about the central axis of the beam inner tube; the light blocking blocks have a light blocking surface for blocking synchrotron radiation light, the light blocking surface extends from one end of the beam inner tube, along the direction from one end to the other end of the beam inner tube, and is inclined toward the central axis direction; A plurality of spring fingers, the plurality of spring fingers are located between the bellows body and the beam inner tube, the plurality of spring fingers are arranged in a circumferential array, one end of the spring finger is fixed to the first flange, and the other end is inclined and extends in a direction toward the central axis of the beam inner tube; A plurality of contact fingers are provided, wherein the plurality of contact fingers are located between the other end of the beam inner tube and the second flange, and the plurality of contact fingers are arranged in a circular array; one end of the contact finger is fixed on the second flange, and the other end is overlapped on the other end of the beam inner tube; the other end of the spring finger is pressed on the other end of the contact finger; and the length direction of the contact finger is parallel to the axis direction of the beam inner tube.

2. The RF shielding bellows according to claim 1, characterized in that: The inner circle of the first flange extends horizontally toward the second flange and is spaced apart from the second flange to form an extension tube, and the extension tube forms two protrusions from its inner tube wall toward the central axis, and the two protrusions are symmetrical about the central axis of the extension tube, and the protrusion has an inclined surface, which extends from the first flange to the second flange and is inclined toward the central axis of the extension tube; the extension tube is formed as the beam inner tube, the central axis of the extension tube is the central axis of the beam inner tube, the protrusion is formed as the light blocking block, and the inclined surface is formed as the light blocking surface, so that the first flange, the beam inner tube, and the two light blocking blocks are an integrated structure.

3. The RF shielding bellows according to claim 1, characterized in that: The light blocking block also has a connecting surface connected between the extended end of the light blocking surface and the inner wall of the beam inner tube; the angle between the light blocking surface and the beam passing through the beam inner tube is an obtuse angle, and the angle between the connecting surface and the beam passing through the beam inner tube is an acute angle.

4. The RF shielding bellows according to claim 1, characterized in that: An annular ridge is arranged on the outer wall of the other end of the beam inner tube, the top end of the annular ridge is directly opposite to the other end of the spring finger, and the other end of the contact finger is overlapped on the annular ridge.

5. The RF shielding bellows according to claim 4, characterized in that The other end of the spring finger is curled into an arc shape, and the arc surface of the arc shape is pressed on the other end of the contact finger.

6. The RF shielding bellows according to claim 1, characterized in that: Also includes: A first cooling structure and a second cooling structure; the second flange is also connected to a tail pipe facing the first flange, the tail pipe is inserted into the corrugated tube body, and the tail pipe is spaced apart from the beam inner tube; the first cooling structure is arranged on the outer wall of the beam inner tube, the second cooling structure is arranged on the outer wall of the tail pipe, and one end of the contact finger is fixed on the tail pipe; the first cooling structure includes: a first annular cooling cavity formed on the outer wall of the beam inner tube, and a first cooling medium inlet and a first cooling medium outlet opened on the first annular cooling cavity; the first cooling medium inlet is used to connect the outlet of the cooling source, and the first cooling medium outlet is used to connect the inlet of the cooling source; the second cooling structure includes: a second annular cooling cavity formed on the outer wall of the tail pipe, and a second cooling medium inlet and a second cooling medium outlet opened on the second annular cooling cavity; the second cooling medium inlet is used to connect the outlet of the cooling source, and the second cooling medium outlet is used to connect the inlet of the cooling source.

7. The RF shielding bellows according to claim 6, characterized in that A first annular connection portion is provided on the outer wall of the beam inner tube, and a second annular connection portion is provided on the outer wall of the tail pipe; one end of the bellows body is connected to the first annular connection portion, and the other end is connected to the second annular connection portion; the first annular cooling cavity is located between the first annular connection portion and the first flange, and the first annular cooling cavity extends into the first flange; the second annular cooling cavity is located between the second annular connection portion and the second flange.

8. The RF shielding bellows according to claim 7, characterized in that An annular fixing piece is also provided on the first annular connecting portion. The circumference of the annular fixing piece coincides with the circumference of one end of the plurality of spring fingers. One end of the spring finger is fixed on the annular fixing piece.

9. The RF shielding bellows according to claim 6, characterized in that: The first cooling structure further includes: a first cooling medium inlet pipe and a first cooling medium outlet pipe, wherein one end of the first cooling medium inlet pipe is connected to the first cooling medium inlet, and the other end is connected to the outlet of the cooling source; one end of the first cooling medium outlet pipe is connected to the first cooling medium outlet, and the other end is connected to the inlet of the cooling source; The second cooling structure also includes: a second cooling medium inlet pipe and a second cooling medium outlet pipe, one end of the second cooling medium inlet pipe is connected to the second cooling medium inlet, and the other end is connected to the outlet of the cooling source; one end of the second cooling medium outlet pipe is connected to the second cooling medium outlet, and the other end is connected to the inlet of the cooling source.

10. The RF shielding bellows according to claim 1, characterized in that: The spring fingers are pre-bent from nickel-based alloy sheets or stainless steel sheets.

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