Cooling disc for standing wave acceleration tube and standing wave acceleration tube

Abstract

The application provides a cooling disc suitable for a standing wave acceleration tube and the standing wave acceleration tube. The cooling disc comprises a body, a sealing ring and a protrusion. The body is disc-shaped and is provided with a beam hole sleeved in a cooling ring groove of an acceleration unit of the standing wave acceleration tube; the sealing ring surrounds the edge of the body and extends in the axial direction of the body, and the sealing ring is provided with an inlet and an outlet for the flow of a cooling medium; the protrusion extends in the axial direction on one side of the body, and extends parallel to the inner wall of the sealing ring, and the protrusion is configured to cooperate with the inner wall of the sealing ring, the body and the side wall of the cooling ring groove to define a first flow channel in communication with the inlet and the outlet to cool the acceleration unit by using the cooling medium. The application helps to reduce the temperature of the surface of the disc and reduce the temperature gradient in the radial direction of the disc.

Description

Technical Field

[0001] At least one embodiment of this application relates to the technical field of electron linear accelerators, and more particularly to a cooling plate and a standing wave accelerator tube suitable for a standing wave accelerator tube. Background Technology

[0002] With the increasing demands for processing efficiency in modern industrial and medical applications, accelerators are developing towards higher average power and higher dose rates. Generally, an accelerating tube comprises multiple sequentially arranged accelerating units, which define an accelerating cavity suitable for radial acceleration of an electron beam. During acceleration, the accelerating tube is required to operate under high duty cycle or even continuous wave conditions. However, accelerating tubes face severe thermal management challenges when operating at high duty cycles.

[0003] To address the heat dissipation issue, existing accelerator tubes only weld or machine cooling water jackets onto the outer cylindrical wall of the cavity. However, heat conduction from its source (the nose cone at the center of the disk) to the outer cooling water jacket requires a relatively long heat conduction path (i.e., the entire radius of the disk). Under conditions of high duty cycle and high heat flux density, the thermal conductivity of the accelerator tube material itself limits heat dissipation efficiency, resulting in a significant temperature gradient between the disk center and the outer wall. This not only causes severe frequency drift, but the enormous thermal stress can also lead to permanent deformation or even fatigue cracking of the disk.

[0004] While existing shaft-coupled π-mode standing wave acceleration structures are highly efficient and compact, they lack effective means to directly remove heat from the core region of the accelerating tube, limiting their performance in high duty cycle and high power applications. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a cooling plate and a standing wave accelerator tube suitable for use with standing wave accelerator tubes, thereby improving the heat dissipation efficiency of the core area of ​​the standing wave accelerator tube.

[0006] According to one aspect of this application, a cooling plate suitable for a standing wave accelerator tube is provided, comprising: a body, which is disc-shaped and has a beam hole provided in a cooling ring groove of an acceleration unit of the standing wave accelerator tube; a sealing ring surrounding the edge of the body and extending in the axial direction of the body, the sealing ring having an inlet and an outlet for the flow of a cooling medium; and a protrusion extending in the axial direction on one side of the body, the protrusion extending parallel to the inner wall of the sealing ring, the protrusion being configured to cooperate with the inner wall of the sealing ring, the side wall of the body and the cooling ring groove to define a first flow channel communicating with the inlet and the outlet, so as to cool the acceleration unit using the cooling medium.

[0007] In this embodiment of the application, the protrusion includes a plurality of arcs spaced apart in the circumferential direction.

[0008] In this embodiment, there is a gap between the inner side of the protrusion and the edge of the beam hole, so that the inner side of the protrusion cooperates with the body, the sidewall and bottom of the cooling ring groove to define a second flow channel communicating with the first flow channel.

[0009] In the embodiments of this application, the disk is formed by at least two separate portions joined together radially along the disk.

[0010] In this embodiment, the two end faces of the sealing ring and the end face of the protrusion facing away from the body are provided with grooves suitable for accommodating welding materials.

[0011] According to another aspect of this application, a standing wave accelerator tube is also provided, comprising: an accelerating section, an input component, and an output component. The accelerating section includes a plurality of accelerating units sequentially connected along the direction of the electron beam, configured to accelerate charged particles input into the accelerating section. Each accelerating unit includes a cylindrical portion and a cooling plate as described in any of the above embodiments. The plurality of cylindrical portions are sequentially joined to form an accelerating cavity, and a cooling ring groove is recessed on the outer wall of each cylindrical portion; the cooling plate is fitted within the cooling ring groove. The input component is disposed on the accelerating section and communicates with the inlet of each accelerating unit to input a cooling medium into each accelerating unit. The output component is disposed on the accelerating section and communicates with the outlet of each accelerating unit to output the heat-exchanged cooling medium from each accelerating unit.

[0012] In this embodiment of the application, the acceleration section includes two acceleration sub-segments; each acceleration sub-segment includes nine acceleration units connected in sequence; the standing wave acceleration tube further includes: a transition section connected between the two acceleration sub-segments, with through holes inside to connect the two acceleration sub-segments and to match the phase of the two acceleration sub-segments.

[0013] In this embodiment, the input component includes: a main input pipe; a branch section connected to the main input pipe; and a branch input pipe, one end of which is connected to the branch section and the other end of which is connected to the inlet on the sealing ring; the inlet of each sealing ring is connected to the branch section through a branch input pipe; the output component includes: a main output pipe; a junction section connected to the main output pipe; and a branch output pipe, one end of which is connected to the junction section and the other end of which is connected to the outlet on the sealing ring; the outlet of each sealing ring is connected to the junction section through a branch output pipe.

[0014] In this embodiment, the external cooling component is disposed on the outer periphery of the acceleration section and is suitable for cooling the exterior of the acceleration section.

[0015] In this embodiment of the application, the external cooling assembly includes: a coil; which is spirally wound around the outside of the acceleration section about the axis of the acceleration section, and is configured to have a cooling medium introduced into it to cool the acceleration section and the transition section.

[0016] According to the embodiments of this application, the standing wave accelerator tube has a cooling plate installed on the acceleration unit and protrusions provided on the cooling plate. These protrusions cooperate with the sealing ring, the body, and the sidewall of the cooling ring groove to form a first flow channel around the beam aperture. Furthermore, by setting the protrusions as spaced arcs, a second flow channel is formed between the inner side of the protrusions and the edge of the beam aperture. This allows the cooling medium to be directly introduced into the interior of the plate, enabling the cooling medium to specifically cool the area where the RF loss is most concentrated. This shortens the heat conduction path and reduces the surface temperature and radial temperature gradient of the plate. Attached Figure Description

[0017] Figure 1 This is an isometric view of a standing wave accelerator tube according to an embodiment of this application;

[0018] Figure 2 This is an isometric view of the internal structure of a standing wave accelerator tube according to an embodiment of this application;

[0019] Figure 3 yes Figure 2 The front view;

[0020] Figure 4 This is a front view of the acceleration unit according to an embodiment of this application;

[0021] Figure 5 This is a front view of the cylindrical body according to an embodiment of this application;

[0022] Figure 6 This is an isometric view of the cooling plate according to an embodiment of this application;

[0023] Figure 7 This is a front view of the cooling tray according to an embodiment of this application;

[0024] Figure 8 This is an axial cross-sectional view of a standing wave accelerating tube according to an embodiment of this application;

[0025] Figure 9 yes Figure 8 A magnified view of part A in the middle;

[0026] Figure 10 This is a front view of the cooling plate formed by the docking of two separate parts according to an embodiment of this application;

[0027] Figure 11 This is another isometric view of the cooling disc according to an embodiment of this application;

[0028] Figure 12This is a field distribution diagram of a standing wave accelerator tube according to an embodiment of this application;

[0029] Figure 13 This is a thermal simulation diagram of the 9-cell structure of a standing wave accelerator tube according to an embodiment of this application.

[0030] 1. Acceleration phase;

[0031] 2. Acceleration unit;

[0032] 21. Cooling tray;

[0033] 211. Ontology;

[0034] 212. Sealing ring;

[0035] 2121. Imports;

[0036] 2122. Export;

[0037] 2123. Snap ring;

[0038] 213. Protrusion;

[0039] 2131. Arc;

[0040] 214. Beam aperture;

[0041] 215. Split body part;

[0042] 22. Cylinder body;

[0043] 221. Cooling ring groove;

[0044] 2211. Circular steps;

[0045] 23. Groove;

[0046] 24. First flow channel;

[0047] 25. Second flow channel;

[0048] 3. Input components;

[0049] 31. Main input tube;

[0050] 32. Flow branch section;

[0051] 33. Input tube;

[0052] 4. Output components;

[0053] 41. Main output tube;

[0054] 42. Convergence section;

[0055] 43. Output tubes;

[0056] 5. Transition section;

[0057] 6. Coil;

[0058] 71. First section;

[0059] 72. Second cover;

[0060] 73. Third cover;

[0061] 74. Compression fitting. Detailed Implementation

[0062] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of this application is for describing specific implementation schemes and not for limiting the scope of protection of this application. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0063] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of this application and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this application, should still fall within the scope of the technical content disclosed in this application. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this application. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this application's implementation.

[0064] Standing-wave accelerator tubes are typically formed by sequentially connecting multiple cylindrical sections. Each section contains an accelerating cavity, and the inner wall of each section bulges radially inward, forming a ring-shaped disk. Charged particles pass through each accelerating cavity in sequence, thereby continuously gaining energy under the influence of the electric field. The disk is the region within the accelerating cavity where the electric field is most concentrated and is also the core area for heat generation. If the disk is not cooled in time, a temperature gradient will be generated in the radial direction, causing not only severe frequency drift but also potentially permanent deformation or even fatigue cracking of the disk.

[0065] In view of this, please refer to Figures 1-11 This application discloses a standing wave accelerator tube, including an acceleration section 1, an input component 3 and an output component 4.

[0066] Please refer to Figures 1-3 Acceleration section 1 includes multiple acceleration units 2 connected sequentially along the direction of the electron beam, configured to accelerate charged particles input to acceleration section 1. In other words, an electromagnetic field is established within acceleration section 1 to accelerate charged particles. In one embodiment of this application, acceleration section 1 establishes an electromagnetic field through a coupler, which feeds electromagnetic energy into acceleration section 1, thereby establishing an electromagnetic field within acceleration section 1 for accelerating charged particles.

[0067] For details, please refer to Figure 4 , Figure 5 Each acceleration unit 2 includes a cylindrical body 22 and a cooling plate 21. Multiple cylindrical bodies 22 are sequentially joined to form an acceleration cavity, and a cooling ring groove 221 is recessed on the outer wall of each cylindrical body 22.

[0068] The cylindrical body 22 is cylindrical. Charged particles pass through the cylindrical body from its center along its axial direction and are accelerated during this process. Cooling ring grooves 221 are formed inwardly on the outer wall of the cylindrical body 22, providing a mounting position for the cooling plate 21. It is readily understood that while the outer wall of the cylindrical body 22 is inwardly recessed to form the cooling ring grooves 221, the inner wall of the cylindrical body 22 is also inwardly recessed to form the plate. In other words, the cooling ring grooves 221 are aligned with the plate in the radial direction of the cylindrical body 22.

[0069] As can be seen from the above, the disk cooling of the accelerating unit of the standing wave accelerating tube in this application depends on the cooling disk 21. Therefore, please refer to... Figures 4-11 This application also specifically discloses a cooling plate suitable for standing wave accelerator tubes, including a body 211, a sealing ring 212 and a protrusion 213.

[0070] Please refer to Figure 6 , Figure 7 The main body 211 is disc-shaped and has a beam hole 214 that is fitted into the cooling ring groove 221 of the acceleration unit 2 of the standing wave accelerating tube. In one embodiment of this application, the beam hole 214 coincides with the axis of the main body 211.

[0071] The sealing ring 212 surrounds the edge of the body 211 and extends in the axial direction of the body 211, so that the sealing ring 212 and the body 211 form a cylindrical structure. The sealing ring 212 is provided with an inlet 2121 and an outlet 2122 for the flow of cooling medium.

[0072] The protrusion 213 extends axially on one side of the body 211, and extends parallel to the inner wall of the sealing ring 212. In other words, the protrusion 213 extends circumferentially on the body 211 in a direction coaxial with the sealing ring 212. The protrusion 213 is configured to cooperate with the inner wall of the sealing ring 212, the body 211, and the side wall of the cooling ring groove 221 to define a first flow channel 24 communicating with the inlet 2121 and the outlet 2122, so as to cool the acceleration unit 2 using a cooling medium.

[0073] It is easy to understand that the protrusion 213 extends parallel to the inner wall of the sealing ring 212, so it can be an integral ring or a multi-ended arc shape.

[0074] Specifically, in some embodiments of this application, the protrusion 213 is annular, making the first flow channel 24 a closed annular chamber. After the cooling medium flows into the first flow channel 24 from the inlet 2121, it is circumferentially distributed within the first flow channel 24 around the body 211, and finally flows out from the outlet 2122. Through the flow of the cooling medium within the first flow channel 24, the entire disk can be uniformly cooled.

[0075] Please refer to Figure 8 , Figure 9 In other embodiments, the protrusion 213 includes a plurality of arcs 2131 spaced apart in the circumferential direction of the body 211. A gap exists between the inner side of the protrusion 213 and the edge of the flow aperture 214, such that the inner side of the protrusion 213 cooperates with the body 211, and the sidewalls and bottom of the cooling ring groove 221 to define a second flow channel 25 that communicates with the first flow channel 24 through the gaps between adjacent arcs 2131. After the cooling medium flows into the first flow channel 24 from the inlet 2121, a portion flows within the first flow channel 24 and finally exits from the outlet 2122, while another portion flows into the second flow channel 25 from the gap between two adjacent protrusions 213, flows within the second flow channel 25, then flows back into the first flow channel 24 via the gap between another two adjacent protrusions 213, and finally exits from the outlet 2122. The flow of the cooling medium within the second flow channel 25 selectively cools the portion of the disc near the axis of the cylinder portion 22 (nose cone).

[0076] In this embodiment, as Figure 7 As shown, the protrusion 213 includes two arcs 2131, which are symmetrically arranged around the center of the body 211. Furthermore, there are two gaps between the ends of the two arcs 2131, one gap being directly opposite the inlet 2121 in the radial direction of the body 211, and the other gap being directly opposite the outlet 2122 in the radial direction of the body 211.

[0077] In some embodiments, the cooling plate 21 is partially embedded in the cooling ring groove 221. In other embodiments, to facilitate fitting the cooling plate 21 into the cooling ring groove 221, the cooling plate 21 is formed by connecting at least two separate portions 215 radially. Thus, after the cooling plate 21 is manufactured, it is divided into multiple separate portions 215 along several radii, and the multiple separate portions 215 are spliced ​​and fixed within the cooling ring groove 221, thereby fitting the cooling plate 21 into the cooling ring groove 221.

[0078] In this embodiment, as Figure 10 As shown, the cooling plate 21 is composed of two separate parts 215, both of which are semi-circular. The two separate parts 215 are joined and fixed along the direction shown by the dotted line in the figure to form the cooling plate 21.

[0079] In some embodiments of this application, the parts 215 are fixed together, the sealing ring 212 is fixed to the sidewall of the cooling ring groove 221, and the protrusion 213 is fixed to the sidewall of the cooling ring groove 221 by brazing. Compared with pressure welding, brazing does not require applying pressure to the workpiece, the joint deformation is small, and the impact of welding on the performance of the standing wave accelerator tube can be reduced.

[0080] Please continue to refer to Figure 6 , Figure 7 In some other embodiments, to further improve the welding quality and sealing effect, grooves 23 suitable for accommodating welding materials are provided on both end faces of the sealing ring 212 and on the end face of the protrusion 213 facing away from the body 211. This allows the molten welding material to automatically fill and remain in the grooves 23 under capillary action during the brazing process, thereby improving the connection strength between the cooling plate 21 and the cooling ring groove 221 and helping to ensure the sealing between the cooling plate 21 and the cooling ring groove 221.

[0081] Please refer to Figure 5 and Figure 11In this embodiment, the edge of the body 211 extends in the opposite direction to the extending square of the sealing ring 212 to form a retaining ring 2123. An annular step 2211 is formed on the sidewall of the cooling ring groove 221 opposite to the retaining ring 2123. The outer diameter of the annular step 2211 matches the inner diameter of the retaining ring 2123, so that when the cooling ring is installed in the cooling ring groove 221, the retaining ring 2123 can engage with the annular step 2211, further improving the sealing performance between the sealing ring 212 and the cooling ring groove 221. In some other embodiments, a groove 23 for accommodating welding material is provided on the end face of the retaining ring 2123 facing away from the body 211. It should be noted that when the cooling disk 21 is in the first or last acceleration unit 2 of an acceleration sub-segment in the direction of the electron beam, the cooling disk 21 is directly connected to the end of the cylinder portion 22 through the sealing ring 212 and the protrusion 213 instead of into the cooling ring groove 221. In this case, a retaining ring 2123 does not need to be formed on the sealing ring 212. Figure 9 As shown.

[0082] Please refer to Figure 1 , Figure 2 and Figure 3 According to another embodiment of this application, a standing wave accelerator tube is provided, including an accelerating section 1. The accelerating section 1 includes a plurality of accelerating units 2 connected sequentially along the direction of the electron beam. The accelerating units are configured to accelerate charged particles input to the accelerating section 1. Each accelerating unit 2 includes a cylindrical portion 22 and a cooling plate 21 as described in any of the above embodiments. The plurality of cylindrical portions 22 are sequentially joined to form an accelerating cavity, and a cooling ring groove 221 is recessed on the outer wall of each cylindrical portion 22. The cooling plate 21 is sleeved within the cooling ring groove 221.

[0083] To provide a circulating cooling medium to the cooling plate 21, the standing wave accelerator tube also includes an input component 3 and an output component 4. The input component 3 is disposed on the acceleration section 1 and communicates with the inlet 2121 of each acceleration unit 2 to input the cooling medium into each acceleration unit 2. The output component 4 is disposed on the acceleration section 1 and communicates with the outlet 2122 of each acceleration unit 2 to output the heat-exchanged cooling medium from each acceleration unit 2.

[0084] The input component 3 includes a main input pipe 31, a branch section 32, and a branch input pipe 33. The branch section 32 is connected to the main input pipe 31, and one end of the branch input pipe 33 is connected to the branch section 32, while the other end is connected to the inlet 2121 on the sealing ring 212. The inlet 2121 of each sealing ring 212 is connected to the branch section 32 through a branch input pipe 33.

[0085] Output assembly 4 includes a main output pipe 41, a busbar 42, and branch output pipes 43. The busbar 42 is connected to the main output pipe 41, and one end of the branch output pipe 43 is connected to the busbar 42, while the other end is connected to an outlet 2122 on the sealing ring 212. The outlet 2122 of each sealing ring 212 is connected to the busbar 42 through a branch output pipe 43.

[0086] In some embodiments, the diversion section 32 is square-tube shaped, with one end of the main inlet pipe 31 connected to the cooling medium source and the other end connected to one side of the diversion section 32 along its length or the side facing away from the acceleration section 1. The side of the diversion section 32 facing the acceleration section 1 is suitable for connection with the sub-inlet pipe 33. After the cooling medium enters the diversion section 32, it flows into each cooling plate 21 through the sub-inlet pipe 33. In some embodiments, the sub-inlet pipe 33 is a straight pipe, perpendicular to the side of the diversion section 32 facing the acceleration section 1, to reduce the length of the sub-inlet pipe 33.

[0087] The manifold 42 is square-tube shaped. One end of the main output pipe 41 is connected to the cooling medium source, and the other end is connected to one side of the manifold 42 along its length or the side facing away from the acceleration section 1. The side of the manifold 42 facing the acceleration section 1 is suitable for connection with the branch output pipes 43. After the cooling medium flows back from each cooling plate 21 to the manifold 42 through the branch output pipes 43, it converges to the main output pipe 41 and finally flows back to the cooling medium source to achieve cooling medium circulation. In some embodiments, the branch output pipes 43 are straight pipes, perpendicular to the side of the manifold 42 facing the acceleration section 1, to reduce the length of the branch output pipes 43.

[0088] The connections between the main inlet pipe 31, the branch section 32 and the branch inlet pipe 33, as well as the main outlet pipe 41, the junction section 42 and the branch outlet pipe 43, can be made through sealing joints or other sealing connectors.

[0089] In some embodiments, the input component 3 and the output component 4 have the same structure. In other words, the input component 3 becomes the output component 4 when the cooling medium flows in the opposite direction, and the output component 4 becomes the input component 3 when the cooling medium flows in the opposite direction.

[0090] Please refer to Figure 3 In this embodiment, the acceleration section 1 includes two acceleration sub-segments; each acceleration sub-segment includes nine acceleration units 2 connected in sequence. The standing wave acceleration tube also includes a transition section 5, which is connected between the two acceleration sub-segments and has through holes inside to connect the two acceleration sub-segments and match the phases of the two acceleration sub-segments.

[0091] It should be noted that the number of acceleration units 2 (cells) included in acceleration segment 1 was selected based on a comprehensive optimization of energy gain, structural compactness, and mode stability.

[0092] From an electromagnetic theory perspective, a standing-wave accelerator tube with multiple accelerating units 2 (N-cells) can be considered as a coupled resonator chain. N coupled accelerating units 2 will form N eigenmodes, whose passband width is approximately the product of the coupling coefficient and the operating frequency (k·f). Therefore, the frequency spacing between adjacent eigenmodes decreases approximately according to a 1 / N rule. Increasing the number of accelerating units N helps improve the energy gain per unit length and makes the overall tube structure more compact; however, increasing N leads to an increase in the number of eigenmodes and a rise in mode density within the passband, significantly reducing the frequency spacing between the π mode and its nearest neighbor, i.e., the (N-1)π / N mode.

[0093] Reducing the mode spacing presents several engineering challenges: First, π modes become more sensitive to cavity size errors and thermal drift, and manufacturing and tuning errors are more likely to disrupt the flatness of the axial electric field. Second, in low-level radio frequency (LLRF) control, the drive frequency is more susceptible to interference from neighboring modes, reducing operating margin. Furthermore, suppressing higher-order modes (HOMs) becomes more difficult. Therefore, the choice of cell number must strike an engineering trade-off between energy gain and mode isolation.

[0094] In this embodiment, please refer to Figure 12 , Figure 13 Through simulation calculations and experimental verification, at an operating frequency of 2856 MHz, the frequency separation between the π-mode and the nearest-neighbor mode of the 9-cell structure of the standing wave accelerator tube is approximately 1.7 MHz. Furthermore, according to thermal-structural multiphysics coupling simulations, under the condition of maximum average power loss (approximately 29.5 kW heat dissipation), the maximum drift of the π-mode resonant frequency caused by thermal deformation is approximately 0.6 MHz. The ratio of these two (isolation) is approximately 2.8 times, which is sufficient to ensure that the π-mode maintains a stable single-mode operating state when the accelerator tube operates at full power and high duty cycle, and provides sufficient tuning margin to compensate for manufacturing tolerances.

[0095] In some embodiments, the standing wave accelerating tube further includes an external cooling assembly. The external cooling assembly is disposed on the outer periphery of the accelerating section 1 and is suitable for cooling the exterior of the accelerating section 1.

[0096] In this embodiment, the external cooling assembly includes a coil 6. The coil 6 is spirally wound around the axis of the acceleration section 1 on the outside of the acceleration section 1 and is configured to have a cooling medium flowing through it to cool the acceleration section 1 and the transition section 5.

[0097] In some embodiments, the standing wave accelerator tube further includes a protective cover, which is cylindrical, fitted over the outside of the coil 6, and coaxial with the acceleration section 1. The protective cover protects the coil 6, input component 3, output component 4, acceleration section 1, and transition section 5 from damage caused by external impacts.

[0098] In other embodiments, such as Figure 1 As shown, the protective cover includes a first cover 71, a second cover 72, and a third cover 73. The first cover 71 and the third cover 73 are respectively located at both ends of the standing wave accelerating tube, respectively covering the portions of the two accelerating sub-sections near the ends of the standing wave accelerating tube, and each has a compression fitting 74 connected to its outer wall. The two compression fittings 74 are respectively used for the input and output of the cooling medium of the coil 6. The second cover 72 is covered on the portions of the two accelerating sub-sections not covered by the first cover 71 and the third cover 73, as well as outside the transition section 5. There are gaps between the first cover 71 and the second cover 72, and between the second cover 72 and the third cover 73, to reserve space for the connection between the accelerating section 1 and the coupler.

[0099] According to the embodiment of this application, the standing wave accelerator tube, by installing a cooling disk 21 on the acceleration unit 2 and setting a protrusion 213 on the cooling disk 21, cooperates with the sidewall of the sealing ring 212, the body 211 and the cooling ring groove 221 to construct a first flow channel 24 surrounding the beam hole 214. Furthermore, by setting the protrusion 213 as an intermittently distributed arc 2131, a second flow channel 25 is formed between the inner side of the protrusion 213 and the edge of the beam hole 214, and the cooling medium is directly introduced into the disk. This allows the cooling medium to specifically cool the area where the RF loss is most concentrated, shortening the heat conduction path and reducing the surface temperature and radial temperature gradient of the disk.

[0100] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cooling plate suitable for standing wave accelerator tubes, characterized in that, include: The main body (211) is disc-shaped and has a beam hole (214) in the cooling ring groove (221) of the acceleration unit (2) of the standing wave accelerating tube. A sealing ring (212) surrounds the edge of the body (211) and extends in the axial direction of the body (211). The sealing ring (212) is provided with an inlet (2121) and an outlet (2122) for the flow of cooling medium. A protrusion (213) extends axially on one side of the body (211) and extends parallel to the inner wall of the sealing ring (212). The protrusion (213) is configured to cooperate with the inner wall of the sealing ring (212), the body (211) and the side wall of the cooling ring groove (221) to define a first flow channel (24) communicating with the inlet (2121) and the outlet (2122) to cool the acceleration unit (2) using the cooling medium.

2. The cooling plate according to claim 1, characterized in that, The protrusion (213) includes a plurality of arcs (2131) spaced apart in the circumferential direction.

3. The cooling plate according to claim 2, characterized in that: There is a gap between the inner side of the protrusion (213) and the edge of the beam hole (214) so ​​that the inner side of the protrusion (213) cooperates with the body (211) and the sidewall and bottom of the cooling ring groove (221) to define a second flow channel (25) communicating with the first flow channel (24).

4. The cooling plate according to claim 2, characterized in that: The cooling plate (21) is formed by at least two separate parts (215) joined together radially along the cooling plate (21).

5. The cooling plate according to claim 1, characterized in that, The sealing ring (212) has grooves (23) on both end faces and the protrusion (213) facing away from the body (211).

6. A standing wave accelerating tube, characterized in that, include: An acceleration section (1) includes multiple acceleration units (2) connected sequentially along the direction of the electron beam, configured to accelerate charged particles input to the acceleration section (1); each acceleration unit (2) includes: A cylindrical section (22), a plurality of cylindrical sections (22) are sequentially joined to form an acceleration chamber, and a cooling annular groove (221) is recessed on the outer wall of each cylindrical section (22); and The cooling plate (21) as described in any one of claims 1-5 is fitted inside the cooling ring groove (221); An input component (3) is disposed on the acceleration section (1) and communicates with the inlet (2121) of each acceleration unit (2) to input a cooling medium into each acceleration unit (2); as well as Output component (4) is disposed on the acceleration section (1) and communicates with the outlet (2122) of each acceleration unit (2) to output the heat-exchanged cooling medium in each acceleration unit (2).

7. The standing wave accelerating tube according to claim 6, characterized in that: The acceleration segment (1) includes two acceleration sub-segments; each acceleration sub-segment includes nine acceleration units (2) connected in sequence. The standing wave accelerator tube also includes: The transition segment (5) is connected between the two acceleration sub-segments and has a through hole inside to connect the two acceleration sub-segments and make the phases of the two acceleration sub-segments match.

8. The standing wave accelerating tube according to claim 6, characterized in that, The input component (3) includes: Main input tube (31); The branch section (32) is connected to the main input pipe (31); and The input pipe (33) is connected at one end to the diversion section (32) and at the other end to the inlet (2121) on the sealing ring (212); the inlet (2121) of each sealing ring (212) is connected to the diversion section (32) through one of the input pipes (33); The output component (4) includes: Total output tube (41); The junction (42) is connected to the main output pipe (41); and The branch output pipe (43) is connected at one end to the junction (42) and at the other end to the outlet (2122) on the sealing ring (212); the outlet (2122) of each sealing ring (212) is connected to the junction (42) through one of the branch output pipes (43).

9. The standing wave accelerating tube according to claim 8, characterized in that, Also includes: An external cooling assembly is disposed on the outer periphery of the acceleration section (1) and is suitable for cooling the exterior of the acceleration section (1) and the transition section (5).

10. The standing wave accelerating tube according to claim 9, characterized in that, The external cooling assembly includes: Coil (6); spirally coiled around the axis of the acceleration section (1) on the outside of the acceleration section (1), and configured to allow cooling medium to be introduced into the inside to cool the acceleration section (1).

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