Tuning mechanism for tuning inherent frequency of electron gun cavity

Abstract

The utility model relates to a tuning mechanism for tuning the inherent frequency of an electron gun cavity, which comprises a cavity fixing part, an electron gun cavity and a cavity tuning part, the electron gun cavity is cylindrical, the front and back of the electron gun cavity are provided with mounting holes, tuning screws are welded in the mounting holes, and the cavity tuning part is provided with a cavity fixing part. The tuning screw is internally provided with a threaded groove, the electronic gun cavity is fixedly connected to the cavity fixing piece, the cavity tuning piece is installed on the outer surface of the electronic gun cavity, the cavity tuning piece is matched with the tuning screw, and the cavity tuning screw is matched with the cavity tuning nut through mutual matching of all the components and matching of the cavity tuning nut and the cavity tuning screw rod. The cavity tuning screw is twisted, one end of the cavity tuning screw is sleeved with the tuning screw in a threaded mode, the cavity tuning screw rotates to enable the tuning screw to move towards the inner side and the outer side of the electron gun cavity, the tuning screw moves to push or pull the electron gun cavity, the inner wall of the electron gun cavity deforms, and therefore the inherent frequency of the electron gun cavity is adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of electron gun cavity tuning, in particular to a tuning mechanism for tuning the natural frequency of an electron gun cavity. Background Art

[0002] With the growth of users and the advancement of accelerator technology, devices based on electron accelerators have developed rapidly. These applications have extremely high requirements on the emittance and bunch length of the electron beam. Therefore, electron guns that produce short electron bunches and have low emittance are the key to the research and development of electron accelerators. The C-band room-temperature photocathode electron gun can withstand higher gradients, shorten the bunch length, and maintain low emittance.

[0003] The frequency of the C-band room-temperature photocathode electron gun is 5712MHz. There is a processing error between the size of the electron gun cavity after mechanical processing and the size of the electron gun cavity in theoretical design. The processing error causes the electron gun cavity frequency to deviate from 5712MHz. A tuning mechanism is needed to adjust the frequency of the electron gun cavity to 5712MHz. Based on the above requirements, a tuning mechanism for tuning the natural frequency of the electron gun cavity is designed. Utility Model Content

[0004] The purpose of the utility model is to provide a tuning mechanism for tuning the natural frequency of an electron gun cavity, so as to solve the problems mentioned in the above background technology.

[0005] The technical solution of the utility model is a tuning mechanism for tuning the natural frequency of an electron gun cavity, comprising a cavity fixing part, an electron gun cavity and a cavity tuning part, the electron gun cavity is cylindrical in shape, each unit cavity on the electron gun cavity is provided with a mounting hole, a tuning screw is welded in the mounting hole, a thread groove is provided in the tuning screw, the electron gun cavity is fixedly connected to the cavity fixing part, the cavity tuning part is installed on the outer surface of the electron gun cavity, and the cavity tuning part cooperates with the tuning screw.

[0006] In one embodiment, the cavity fixing part includes a supporting base plate, connecting bolts, a first supporting connecting plate and a second supporting connecting plate. A threaded hole is opened on the supporting base plate. The connecting bolts are fixedly connected to both sides of the top surface of the supporting base plate. The first supporting connecting plate and the second supporting connecting plate are respectively threadedly connected to the connecting bolts on both sides. The first supporting connecting plate and the second supporting connecting plate are both designed as semi-cylindrical rings and are provided with through holes for connecting bolts. The two ends of the electron gun cavity are respectively fixedly connected to the semicircular grooves on the tops of the first supporting connecting plate and the second supporting connecting plate.

[0007] In one embodiment, the cavity tuning component includes a cavity clamp, a positioning screw, a clamp tightening nut, a cavity tuning nut and a cavity tuning screw. The cavity clamp is a semicircular ring structure and has side wings installed on the surface. A first through hole is opened on the side wing. The two ends of the positioning screw are respectively threadedly connected in adjacent first through holes. A second through hole is opened in the middle of the positioning screw. The cavity tuning screw is movably sleeved in the second through hole. One end of the cavity tuning screw is threadedly connected to the inner cavity of the tuning screw. Two cavity tuning nuts are installed at the position where the cavity tuning screw passes through the second through hole. The outer surface of the cavity tuning nut is a hexahedral structure, and a socket is opened on each surface. When the adjustment space is tight, a small lever can be inserted into the socket to realize the rotation of the cavity tuning nut.

[0008] In one embodiment, the bottom of the hole of the tuning screw is 1.3 mm to 1.6 mm away from the inner thickness of the cavity.

[0009] In one embodiment, the first supporting connecting plate and the second supporting connecting plate are both designed as semi-cylindrical rings, a flange is installed on the electron gun cavity 2, the inner diameter of the semi-cylindrical ring is slightly larger than the outer diameter of the flange on the cavity to which it is fixed, the first supporting connecting plate and the second supporting connecting plate are fixedly connected with connecting wings on both sides of the semi-cylindrical rings, which are convenient for connection with the supporting base plate through connecting bolts, the two supporting plates of the supporting base plate are designed as semi-cylindrical support cavity flanges, and are fixedly connected to the electron gun cavity with the first supporting connecting plate and the second supporting connecting plate through connecting bolts.

[0010] The beneficial effects provided by the utility model are:

[0011] Through the cooperation between various components, through the cooperation between the cavity tuning nut and the cavity tuning screw, the cavity tuning nut is twisted to make the cavity tuning screw move away from or close to the electron gun cavity. Since one end of the cavity tuning screw is threadedly sleeved in the tuning screw, the tuning screw moves toward the inside and outside of the electron gun cavity. The movement of the tuning screw pushes or pulls the electron gun cavity, causing the inner wall of the electron gun cavity to deform, thereby adjusting the natural frequency of the electron gun cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the front view of the utility model;

[0013] Figure 2 is a front view of the cavity fixing member;

[0014] Figure 3 is a side view of the cavity fixing member;

[0015] Figure 4 is a side view of the cavity fixing member;

[0016] Figure 5 is a side view of the cavity tuning component;

[0017] Figure 6 is the front view of the cavity tuning component;

[0018] Figure 7 A top view of the cavity tuning component.

[0019] In the accompanying drawings, 1. cavity fixing part; 11. supporting bottom plate; 12. connecting bolt; 13. first supporting connecting plate; 14. second supporting connecting plate; 2. electron gun cavity; 3. cavity tuning part; 31. cavity clamp; 32. positioning screw; 33. clamp clamping nut; 34. cavity tuning nut; 35. cavity tuning screw. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The technical solution of the present invention will be further described below in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0021] It should be understood that the same or similar numbers in the drawings of the embodiments correspond to the same or similar parts. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom" and the like indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] In one embodiment, Figure 1-7 As shown, a tuning mechanism for tuning the natural frequency of an electron gun cavity comprises a cavity fixing part 1, an electron gun cavity 2 and a cavity tuning part 3. The electron gun cavity 2 is cylindrical in shape. Each unit cavity on the electron gun cavity 2 is provided with a mounting hole. A tuning screw is welded in the mounting hole. The tuning screw has a thread groove on the inner side. The electron gun cavity 2 is fixedly connected to the cavity fixing part 1. The cavity tuning part 3 is installed on the outer surface of the electron gun cavity 2. The cavity tuning part cooperates with the tuning screw.

[0023] In order to fix and support the electron gun cavity 2, the cavity fixing part 1 includes a supporting bottom plate 11, connecting bolts 12, a first supporting connecting plate 13 and a second supporting connecting plate 14. A threaded hole is opened on the supporting bottom plate 11. The connecting bolts 12 are fixedly connected to both sides of the top surface of the supporting bottom plate 11. The first supporting connecting plate 13 and the second supporting connecting plate 14 are respectively threadedly connected to the connecting bolts 12 on both sides. The first supporting connecting plate 13 and the second supporting connecting plate 14 are both designed as semi-cylindrical rings and are provided with through holes for the connecting bolts 12. The two ends of the electron gun cavity 2 are respectively fixedly connected to the semi-circular grooves on the tops of the first supporting connecting plate 13 and the second supporting connecting plate 14.

[0024] In order to make the cavity tuning screw 35 push and pull the tuning screw, thereby causing the deformation of the inner surface of the electron gun cavity 2, and realizing the adjustment of the natural frequency of the electron gun cavity 2, the cavity tuning component 3 includes a cavity clamp 31, a positioning screw 32, a clamp clamp nut 33, a cavity tuning nut 34 and a cavity tuning screw 35. The cavity clamp 31 is a semicircular ring structure, and a side wing is installed on the surface. The side wing is provided with a first through hole. The two ends of the positioning screw 32 are respectively threadedly connected in the adjacent first through holes. The positioning screw 32 is screwed in the adjacent first through holes. A second through hole is opened in the middle of the screw rod 32, and the cavity tuning screw rod 35 is movably sleeved in the second through hole. One end of the cavity tuning screw rod 35 is threadedly connected to the inner cavity of the tuning screw. Two cavity tuning nuts 34 are installed at the position where the cavity tuning screw rod 35 passes through the second through hole. The outer surface of the cavity tuning nut 34 is a hexahedral structure, and a socket is opened on each surface. When the adjustment space is tight, a small lever can be inserted into the socket to realize the rotation of the cavity tuning nut 34.

[0025] In order to cause deformation inside the electron gun cavity 2 when the bottom of the hole of the tuning screw is pushed or pulled, the thickness of the bottom of the hole of the tuning screw is 1.3 mm to 1.6 mm from the inside of the cavity.

[0026] In order to fix the electron gun cavity, the first supporting connecting plate 13 and the second supporting connecting plate 14 are both designed as semi-cylindrical rings. A flange is installed on the electron gun cavity 2. The inner diameter of the semi-cylindrical ring is slightly larger than the outer diameter of the flange on the cavity to which it is fixed. The first supporting connecting plate 13 and the second supporting connecting plate 14 are fixedly connected with connecting wings on both sides of the semi-cylindrical rings, which are convenient for connecting with the supporting bottom plate 11 through connecting bolts 12. The two supporting plates of the supporting bottom plate 11 are designed in a semi-cylindrical shape, supporting the cavity flange, and fixedly connected with the first supporting connecting plate 13 and the second supporting connecting plate 14 to the electron gun cavity 2 through connecting bolts 12.

[0027] Working principle: When the utility model is used, the cavity fixing part 1 supports the electron gun cavity 2, and the cavity tuning part 3 is fixed on the electron gun cavity 2 through the cavity clamp 31, the positioning screw 32 and the clamp tightening nut 33. Through the cooperation of the cavity tuning nut 34 and the cavity tuning screw 35, the cavity tuning nut 34 is twisted to make the cavity tuning screw 35 move away from or close to the electron gun cavity. One end of the cavity tuning screw 35 is threadedly sleeved in the tuning screw. The movement of the cavity tuning screw 35 can make the tuning screw move inside and outside the electron gun cavity 2, and the movement of the tuning screw will push or pull the electron gun cavity 2, so that the inner wall of the electron gun cavity 2 is deformed, thereby adjusting the natural frequency of the electron gun cavity 2.

[0028] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A tuning mechanism for tuning the natural frequency of an electron gun cavity, characterized in that: It comprises a cavity fixing part, an electron gun cavity and a cavity tuning part. The shape of the electron gun cavity is cylindrical. Each unit cavity of the electron gun cavity is provided with a mounting hole. A tuning screw is welded in the mounting hole. The tuning screw has a thread groove therein. The electron gun cavity is fixedly connected to the cavity fixing part. The cavity tuning part is installed on the outer surface of the electron gun cavity. The cavity tuning part cooperates with the tuning screw.

2. The tuning mechanism for tuning the natural frequency of an electron gun cavity according to claim 1, characterized in that: The cavity fixing part includes a supporting bottom plate, connecting bolts, a first supporting connecting plate and a second supporting connecting plate. A threaded hole is provided on the supporting bottom plate. The connecting bolts are fixedly connected to both sides of the top surface of the supporting bottom plate. The first supporting connecting plate and the second supporting connecting plate are respectively threadedly connected to the connecting bolts on both sides. The first supporting connecting plate and the second supporting connecting plate are both designed as semi-cylindrical rings and are provided with through holes for connecting bolts. The two ends of the electron gun cavity are respectively fixedly connected to the semi-circular grooves on the tops of the first supporting connecting plate and the second supporting connecting plate.

3. The tuning mechanism for tuning the natural frequency of an electron gun cavity according to claim 1, characterized in that: The cavity tuning component includes a cavity clamp, a positioning screw, a clamp tightening nut, a cavity tuning nut and a cavity tuning screw. The cavity clamp is a semicircular ring structure and is provided with side wings on the surface. A first through hole is provided on the side wing. Both ends of the positioning screw are respectively threadedly connected in adjacent first through holes. A second through hole is provided in the middle of the positioning screw. The cavity tuning screw is movably sleeved in the second through hole. One end of the cavity tuning screw is threadedly connected to the inner cavity of the tuning screw. Two cavity tuning nuts are installed at the position where the cavity tuning screw passes through the second through hole. The outer surface of the cavity tuning nut is a hexahedral structure, and a socket is provided on each surface. When the adjustment space is tight, a small lever can be inserted into the socket to realize the rotation of the cavity tuning nut.

4. The tuning mechanism for tuning the natural frequency of an electron gun cavity according to claim 1, characterized in that: The bottom of the hole of the tuning screw is 1.3 mm to 1.6 mm thick from the inside of the cavity.

5. The tuning mechanism for tuning the natural frequency of an electron gun cavity according to claim 2, characterized in that: The first supporting connecting plate and the second supporting connecting plate are both designed as semi-cylindrical rings. A flange is installed on the electron gun cavity. The inner diameter of the semi-cylindrical ring is larger than the outer diameter of the flange on the cavity to which it is fixed. The first supporting connecting plate and the second supporting connecting plate are fixedly connected with connecting wings on both sides of the semi-cylindrical rings, which are convenient for connection with the supporting base plate through connecting bolts. The two supporting plates of the supporting base plate are designed as semi-cylindrical, supporting the cavity flange, and fixedly connected to the electron gun cavity with the first supporting connecting plate and the second supporting connecting plate through connecting bolts.

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