A movable tuner device for a room-temperature high-frequency cavity

Abstract

This invention relates to a movable tuner device for a room-temperature high-frequency cavity, belonging to the field of accelerator technology. This device is applied to the medium-energy linear accelerator at the China Spallation Neutron Source, providing a high-quality beam for the fast cyclic synchrotron ring. It mainly includes components such as a guide post, linear bearing, trapezoidal screw, nut, reducer, Parker motor, guide post connecting plate, displacement sensor, reducer interface flange, welded bellows, support cylinder, tuning cylinder, spiral water circuit assembly, and limit switches. The guide post and linear bearing guide the linear motion of the trapezoidal screw, replacing the traditional keyway structure, reducing the gap between the reducer interface flange and the trapezoidal screw, improving the concentricity of the tuning cylinder, and ensuring smooth movement. When the cavity frequency changes due to beam load effects or cavity temperature variations, the Parker motor drives the trapezoidal screw to move linearly via the reducer and nut, adjusting the position of the tuning cylinder to maintain frequency stability.

Description

Technical Field

[0001] This invention relates to the field of accelerator technology, and more specifically to a movable tuner device for a room-temperature high-frequency cavity. Background Technology

[0002] In the field of accelerator technology, the China Spallation Neutron Source (CSNS) is an important scientific research facility, in which the Drift Tube Linac (DTL) plays a key role. The DTL can accelerate the 3MeV energy beam from the radio frequency quadrupole (RFQ) to the 80MeV energy required for injection into the Fast Cyclic Synchrotron (RCS), providing a high-quality beam for the RCS ring, and is an indispensable and important component of CSNS.

[0003] The movable tuner is one of the key components of DTL. When the cavity frequency changes due to factors such as beam load effect or cavity temperature change, the movable tuner can adjust in time to maintain frequency stability, thereby ensuring normal beam acceleration.

[0004] In existing technologies, the choke-type movable tuner used in DTL employs a cantilever structure for its tuning head. During the linear motion of the tuning head, it is necessary to meet the requirements of smooth operation and good concentricity. However, previous structures achieved linear motion of the trapezoidal screw by creating keyways on both sides of the trapezoidal screw and having the keys on both sides of the reducer interface flange engage with these keyways. Due to the existence of a certain amount of play between the keyways and the keys, in previous structures, the single-sided clearance was 0.1mm in one direction and 0.3mm in the other. This design resulted in poor concentricity and significant wobbling of the lower tuning cylinder during the cantilever structure's movement, failing to meet the high precision and high stability requirements of accelerator engineering.

[0005] Therefore, in order to solve the problem of difficulty in ensuring the concentricity of the cantilever structure of the tuner tube, improve the performance of the movable tuner, and ensure that the DTL can stably and efficiently provide high-quality beam current for the RCS ring, it is necessary to improve the existing movable tuner structure. Summary of the Invention

[0006] Based on the above problems, the present invention aims to provide a movable tuner device for a room-temperature high-frequency cavity. This device is mainly used in the medium-energy linear accelerator of the China Spallation Neutron Source (CSNS) to maintain frequency stability when the cavity frequency changes due to factors such as beam load effect or cavity temperature change, thereby ensuring beam acceleration and providing high-quality beam for the Fast Cyclic Synchrotron (RCS) ring.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a movable tuner device for a room temperature high frequency cavity, characterized in that: it includes a guide post, a linear bearing, a guide post connecting plate, a trapezoidal screw, a nut, a reducer, a reducer interface flange, a welded bellows, a tuning cylinder, a support cylinder, a Parker motor, a displacement sensor, a spiral water circuit assembly, and a limit switch;

[0008] The Parker motor is connected to the reducer to drive the reducer to rotate; the reducer is connected to the nut to drive the nut to rotate; the nut cooperates with the trapezoidal screw to drive the trapezoidal screw to move; the trapezoidal screw is connected above by the guide post connecting plate, the guide post and the linear bearing to restrict the rotation of the trapezoidal screw in the circumferential direction and realize linear motion in the vertical direction; the reducer interface flange is set at the connection between the trapezoidal screw and the reducer, and the single-sided gap between the reducer interface flange and the trapezoidal screw is 0.05mm.

[0009] The tuning cylinder is connected to the trapezoidal screw, and the support cylinder is used to support the tuning cylinder. The single-sided gap between the tuning cylinder and the support cylinder is 2.5mm ± 0.2mm. The welded bellows is set on the tuning cylinder to seal and allow the linear movement of the tuning cylinder. The spiral water circuit assembly is used to provide circulating cooling water to the tuner for cooling.

[0010] The guide posts and linear bearings are in pairs, symmetrically arranged above the trapezoidal screw, and connected by the guide post connecting plate to achieve linear movement of the trapezoidal screw.

[0011] The gap design between the reducer interface flange and the trapezoidal screw effectively reduces the amount of wobble when the trapezoidal screw is connected to the nut, ensuring concentricity.

[0012] The gap design between the tuning cylinder and the support cylinder ensures that the tuning cylinder has good concentricity and moves smoothly without jamming during operation.

[0013] The Parker motor provides power to the device, and transmits the power to the trapezoidal screw through the reducer and the nut, thereby realizing the linear motion of the trapezoidal screw.

[0014] One end of the welded bellows is connected to the tuning cylinder, and the other end is connected to the external structure. While ensuring a seal, it allows the tuning cylinder to move linearly to adapt to displacement changes during the tuning process.

[0015] The device also includes a limit switch for limiting the linear travel of the trapezoidal screw to prevent it from exceeding the safe range.

[0016] The device also includes a displacement sensor for real-time monitoring of the length of the tuner within the cavity.

[0017] The guide post is made of high-strength material to ensure stable guidance during the linear movement of the trapezoidal screw.

[0018] The linear bearing and the guide post are precisely fitted to reduce friction and wobbling during movement and improve the accuracy of the linear motion of the trapezoidal screw.

[0019] The spiral water circuit assembly is used to provide circulating cooling water to the tuner for cooling.

[0020] The device is used in the medium-energy linear accelerator of CSNS. When the cavity frequency changes due to factors such as beam load effect or cavity temperature change, the movable tuner device keeps the frequency constant, thereby ensuring the acceleration of the beam and providing a high-quality beam for the RCS ring.

[0021] The technical effects achieved by this invention are as follows: The movable tuner device for a room-temperature high-frequency cavity of this invention has the following significant advantages compared to the prior art:

[0022] Improved concentricity: By adding two pairs of bearings and linear guide rods (i.e., guide posts and linear bearings) above the trapezoidal screw and connecting them with guide post connecting plates, the previous structure of keyways on both sides of the trapezoidal screw is replaced; the single-sided gap between the reducer interface flange and the trapezoidal screw is only 0.05mm, and the single-sided gap between the tuning cylinder and the support cylinder is 2.5mm±0.2mm, which effectively reduces the amount of shaking during the movement and greatly improves the concentricity of the tuning cylinder when the trapezoidal screw moves linearly, meeting the actual high-precision requirements of accelerator engineering.

[0023] Smooth and seamless movement: The new structural design ensures that the tuning cylinder moves smoothly during operation, avoiding the jamming caused by mismatches in the keyway and key machining that occurred in previous structures, thus guaranteeing the stable operation of the movable tuner.

[0024] Ensuring frequency stability: This device can adjust the cavity frequency in a timely and accurate manner when the cavity frequency changes due to factors such as beam load effect or cavity temperature variation, thereby maintaining the cavity frequency unchanged, ensuring normal beam acceleration, providing high-quality beam for the RCS ring, and is of great significance to the overall performance improvement of the China Spallation Neutron Source (CSNS).

[0025] Structural optimization: The linear motion of the trapezoidal screw is achieved by using guide posts and linear bearings, resulting in a more rational structure, reduced wear between components, extended service life of the device, and lower maintenance costs.

[0026] Highly efficient power transmission: The Parker motor drives the reducer to rotate, which in turn drives the nut to rotate, thereby driving the trapezoidal screw to move. The power transmission path is clear and efficient, enabling rapid response to frequency changes and improving the overall response speed and working efficiency of the device. Excellent sealing performance: The welded bellows ensures the device's sealing while allowing the tuning cylinder to move linearly, effectively preventing external factors from affecting the device's interior and ensuring the stability and reliability of the device's operation.

[0027] Safe and controllable travel: The limit switch restricts the linear travel of the trapezoidal screw, preventing it from exceeding the safe range and avoiding damage to the device due to excessive movement, thus improving the device's safety. The displacement sensor can monitor the length of the tuner within the cavity in real time. Attached Figure Description

[0028] Figure 1 This is a three-dimensional assembly diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure in this invention;

[0031] Attached diagram labels: 1-Guide post, 2-Linear bearing, 3-Guide post connecting plate, 4-Trapezoidal screw, 5-Nut, 6-Reducer, 7-Reducer interface flange, 8-Welded bellows, 9-Tuning cylinder, 10-Support cylinder, 11-Parker motor, 12-Displacement sensor, 13-Spiral water circuit assembly, 14-Limit switch. Detailed Implementation

[0032] The following detailed description of the specific embodiments of the movable tuner device for a room-temperature high-frequency cavity of the present invention, with reference to the accompanying drawings, is provided in detail.

[0033] like Figure 1 As shown, this embodiment illustrates the overall appearance of the movable tuner device and the assembly relationship of its components, including the positions and approximate shapes of the main components such as guide post 1, linear bearing 2, guide post connecting plate 3, trapezoidal screw 4, reducer 6, reducer interface flange 7, tuning cylinder 9, support cylinder 10, Parker motor 11, displacement sensor 12, spiral water circuit assembly 13, and limit switch 14. The inlet and outlet pipes in the spiral water circuit assembly 13 are located on the upper sides of the device, respectively, for the inflow and outflow of fluid. The guide post connecting plate 3 is horizontally connected to the upper part of the device, serving to connect and fix the guide post 1. The displacement sensor 12 is installed on one side of the support cylinder 10 to monitor the positional changes of the tuning cylinder 9. The support cylinder 10 provides support for the tuning cylinder 9. The tuning cylinder 9 is located at the center of the device and is a key component for frequency adjustment.

[0034] Figure 2 This is a front view of the device in this embodiment, showing the layout of components such as guide post 1, linear bearing 2, guide post connecting plate 3, trapezoidal screw 4, reducer 6, reducer interface flange 7, tuning cylinder 9, support cylinder 10, Parker motor 11, and displacement sensor 12. The Parker motor 11 is mounted on the top of the device and transmits power through the reducer 6. The reducer interface flange 7 connects the reducer 6 and the trapezoidal screw 4 to ensure the stability of power transmission. The limit switch 14 is located on one side of the device to limit the travel of the trapezoidal screw 4.

[0035] Figure 3 The internal cross-sectional structure of the device is shown, including the trapezoidal screw 4, nut 5, reducer 6, reducer interface flange 7, welded bellows 8, support cylinder 10, Parker motor 11, spiral water circuit assembly 13, and limit switch 14. The trapezoidal screw 4 and the copper nut 5 work together to achieve linear motion. The bellows joint connects to the bellows 8, which serves to seal and allow the tuning cylinder 9 to move linearly.

[0036] Specific implementation examples: such as Figure 1-3 As shown, the movable tuner device for a room temperature high-frequency cavity in this embodiment mainly includes components such as a guide post 1, a linear bearing 2, a guide post connecting plate 3, a trapezoidal screw 4, a nut 5, a reducer 6, a reducer interface flange 7, a welded bellows 8, a tuning cylinder 9, a support cylinder 10, a Parker motor 11, a displacement sensor 12, a spiral water circuit assembly 13, and a limit switch 14.

[0037] During the assembly process, the linear bearing 2 is first installed on the guide post 1, and then the guide post 1 is fixed in the appropriate position of the device through the guide post connecting plate 3 to form a guiding structure for the linear movement of the trapezoidal screw 4; then, the nut 5 is fitted and installed with the trapezoidal screw 4 to ensure that the two can move smoothly relative to each other.

[0038] The reducer 6 is connected to the Parker motor 11, so that the Parker motor 11 can drive the reducer 6 to rotate; the reducer 6 is then connected to the nut 5, thereby transmitting power to the nut 5, causing the nut 5 to rotate, and thus driving the trapezoidal screw 4 to move; the trapezoidal screw 4 is connected above by the guide post connecting plate 3, the guide post 1 and the linear bearing 2, which restricts its rotation in the circumferential direction and realizes linear motion in the vertical direction.

[0039] A reducer interface flange 7 is installed at the connection between the trapezoidal screw 4 and the reducer 6. The single-sided gap between the reducer interface flange 7 and the trapezoidal screw 4 is controlled at 0.05mm to reduce the amount of shaking and ensure concentricity.

[0040] The tuning cylinder 9 is connected to the trapezoidal screw 4, and the support cylinder 10 is used to support the tuning cylinder 9. The single-sided gap between the tuning cylinder 9 and the support cylinder 10 is designed to be 2.5mm±0.2mm to ensure that the tuning cylinder 9 has good concentricity and smooth movement without jamming during the movement.

[0041] A welded bellows 8 is installed on the tuning cylinder 9. One end of the welded bellows 8 is connected to the tuning cylinder 9, and the other end is connected to the external structure. While ensuring a seal, the tuning cylinder 9 is allowed to move linearly to adapt to displacement changes during the tuning process.

[0042] In addition, a limit switch 14 is installed on the device to limit the linear motion stroke of the trapezoidal screw 4, prevent it from exceeding the safe range, and ensure the safe operation of the device.

[0043] When the cavity frequency changes due to factors such as beam load effect or cavity temperature change, the Parker motor 11 starts, driving the reducer 6 to rotate. The reducer 6 drives the nut 5 to rotate, and the nut 5 drives the trapezoidal screw 4 to move linearly, thereby adjusting the position of the tuning cylinder 9, keeping the frequency constant, ensuring beam acceleration, and providing high-quality beam for the RCS ring.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A movable tuner device for a room temperature high frequency cavity, characterized by: Includes guide post (1), linear bearing (2), guide post connecting plate (3), trapezoidal screw (4), nut (5), reducer (6), reducer interface flange (7), welded bellows (8), tuning cylinder (9), support cylinder (10), Parker motor (11), displacement sensor (12), spiral water circuit assembly (13), and limit switch (14). The Parker motor (11) is connected to the reducer (6) to drive the reducer (6) to rotate; the reducer (6) is connected to the nut (5) to drive the nut (5) to rotate; the nut (5) cooperates with the trapezoidal screw (4) to drive the trapezoidal screw (4) to move; the trapezoidal screw (4) is connected above by the guide post connecting plate (3), the guide post (1) and the linear bearing (2) to restrict the rotation of the trapezoidal screw (4) in the circumferential direction and realize linear motion in the up and down direction; the reducer interface flange (7) is set at the connection between the trapezoidal screw (4) and the reducer (6), and the single-sided gap between the reducer interface flange (7) and the trapezoidal screw (4) is 0.05mm; The tuning cylinder (9) is connected to the trapezoidal screw (4), and the support cylinder (10) is used to support the tuning cylinder (9). The single-sided gap between the tuning cylinder (9) and the support cylinder (10) is 2.5mm ± 0.2mm. The welded bellows (8) is set on the tuning cylinder (9) to seal and allow the linear movement of the tuning cylinder (9). The spiral water circuit assembly (13) is used to provide circulating cooling water to the tuner for cooling.

2. The movable tuner device for a room temperature high frequency cavity according to claim 1, characterized by: The number of guide posts (1) and linear bearings (2) are two pairs, symmetrically arranged above the trapezoidal screw (4), and connected by the guide post connecting plate (3) to realize the linear movement of the trapezoidal screw (4).

3. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The gap design between the reducer interface flange (7) and the trapezoidal screw (4) effectively reduces the amount of shaking when the trapezoidal screw (4) is connected to the nut (5), ensuring concentricity.

4. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The gap design between the tuning cylinder (9) and the support cylinder (10) ensures that the tuning cylinder (9) is concentric and moves smoothly without jamming during the movement.

5. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The Parker motor (11) provides power to the device and transmits the power to the trapezoidal screw (4) through the reducer (6) and the nut (5) to achieve the linear motion of the trapezoidal screw (4).

6. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: One end of the welded bellows (8) is connected to the tuning cylinder (9), and the other end is connected to the external structure. While ensuring a seal, the tuning cylinder (9) is allowed to move linearly to adapt to displacement changes during the tuning process.

7. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The device also includes a limit switch (14) for limiting the linear travel of the trapezoidal screw (4) to prevent it from exceeding the safe range.

8. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The device also includes a displacement sensor (12) for real-time monitoring of the length of the tuner within the cavity.

9. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The guide post (1) is made of high-strength material to ensure stable guidance during the linear motion of the trapezoidal screw (4).

10. The movable tuner device for a room-temperature high-frequency cavity according to claim 1, characterized in that: The linear bearing (2) and the guide post (1) are precisely fitted to reduce friction and shaking during the movement and improve the accuracy of the linear motion of the trapezoidal screw (4).

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