CN109936909B - A fixed structure of drift tube and interdigital drift tube accelerator - Google Patents

Abstract

The invention discloses a fixed structure of a drift tube and an interdigital drift tube accelerator, wherein the fixed structure comprises: the first side surface of the supporting seat is provided with a matching hole; the drift tube is arranged on the supporting seat, and the positioning column extends into the matching hole; and an electrical seal member electrically sealed between the mounting end face and the first side face. According to the fixing structure, the first side surface of the supporting seat is provided with the matching hole, the mounting end surface of the drift tube is protruded with the positioning column, the drift tube is mounted on the supporting seat, the positioning column extends into the matching hole and is matched with the matching hole, so that the position of the drift tube on the supporting seat is ensured, the electric sealing element is sealed between the mounting end surface and the first side surface, the drift tube can be fixed on the first side surface by using a screw locking mode and the like, and the electric sealing requirement of the drift tube and the supporting seat is better met; moreover, the method is convenient to process and low in cost.

Description

A fixed structure of drift tube and interdigital drift tube accelerator

technical field

This article relates to the technical field of accelerator equipment, especially to a fixed structure of a drift tube and an interdigital drift tube accelerator.

Background technique

The existing interdigital drift tube accelerators generally use two methods to fix the drift tube on the support seat;

1. Welding and fixing

Since the usual choice of drift tube material is TU1 or better TU0, this type of welding fix will limit the material of the components and the welding method:

a. Material Restrictions

Because it is fixed by welding, it is necessary to consider the thermal deformation coefficient of both parties during welding. Generally, the thermal deformation coefficient is not much different or the same material is selected for welding; therefore, the material of the support seat is generally selected TU1 or TU0;

b. Restrictions on welding methods

Because the characteristics of the accelerator determine that the surface finish of the internal components of the accelerator has a high requirement, the use of conventional welding will lead to poor surface finish of the weld position, which cannot meet the requirements of the accelerator; general welding needs to use brazing or electron beam welding, two kinds of welding The cost of the method is high, and it is not easy to realize the welding of larger components;

Considering this method, it will be difficult to control such as welding deformation, which will indirectly reduce the functionality of the accelerator, and the cost of welding is relatively high;

2. Screw fixing

There are two conventional screw fixing methods

One is to process mounting holes on the support seat, fix the support seat on the cavity, and then fix the drift tube on the support seat with screws; this connection method leads to double electrical sealing and position accuracy adjustment problems; in the later stage There will be great hidden dangers in the installation and adjustment;

The other is the integrated processing of the support seat and the cavity. The mounting holes are machined on the support seat, holes are drilled on the drift tube base, and the drift tube is fixed on the support seat by screws. Due to the design of the drift tube, drift The fixing screws on the tube are far apart and easy to process, but they cannot meet the stress requirements on the bottom surface of the drift tube and electrical sealing requirements. If the distance between the fixing screws is reduced and the electrical sealing is satisfied as much as possible, the head of the drift tube will block the support seat, which is not easy to process, and the design and processing are difficult.

SUMMARY OF THE INVENTION

In order to solve at least one of the above technical problems, this paper provides a fixed structure for a drift tube, which can better meet the electrical sealing requirements of the drift tube and the support seat and the stress requirements of the bottom surface of the drift tube, and is easy to process and low in cost. .

The fixing structure of the drift tube provided by the embodiment of the present invention includes: a support seat, a first side surface of which is provided with a matching hole; a drift tube, a positioning post protruding from the installation end surface of the drift tube, and the drift tube is installed on the support seat The positioning column extends into the matching hole; and an electrical seal is electrically sealed between the installation end surface and the first side surface.

Optionally, a first annular groove arranged along the circumferential direction of the positioning column is provided on the installation end surface, and the electrical seal is installed in the first annular groove.

Optionally, the electrical seal is an indium wire.

Optionally, the fixing structure of the drift tube further includes: a process end cap, the matching hole is a through hole, and the process end cap seals an end of the through hole away from the drift tube.

Optionally, the fixing structure of the drift tube further includes: a sealing member, the matching hole is a stepped hole, the stepped surface of the stepped hole faces away from the drift tube, and the process end cap is pressed against the stepped face, the seal seals between the process end cap and the stepped face.

Optionally, the positioning column is provided with an inner threaded hole, and the threaded end of the screw passes through the process end cap and is screwed on the inner threaded hole to fix the process end cap.

Optionally, the process end cover is provided with a second annular groove, and the sealing member is located in the second annular groove.

Optionally, the seal is an O-ring.

Optionally, the mounting end face is further provided with a through hole, and the first side surface is provided with a screw hole, and the screw passes through the through hole and is screwed into the screw hole.

Optionally, the through holes, the screw holes and the screws include multiple groups spaced apart along the circumference of the positioning post.

The interdigital drift tube accelerator provided by the present invention includes the fixing structure of the drift tube according to any one of the above embodiments, the support base is a cavity, and the drift tube is located in the cavity.

Compared with the prior art, in the fixing structure of the drift tube provided by the present invention, the first side surface of the support seat is provided with a matching hole, the installation end surface of the drift tube is protruded with a positioning column, and the drift tube is installed on the support seat and positioned. The column extends into the matching hole and matches with the matching hole, so as to ensure the position of the drift tube on the support seat, the electrical seal is sealed between the installation end face and the first side, and the drift tube can be installed on the first side. It is fixed by means of screw locking, which can better meet the electrical sealing requirements of the drift tube and the support seat; and this method is convenient for processing and low in cost. The drift tube and the support base can be fixed with two screws on the top and one screw on the bottom to increase the stress on the bottom surface of the drift tube.

Other features and advantages of this document will be set forth in the description that follows, and in part will be apparent from the description, or will be learned by practice of this document. The objectives and other advantages herein may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions herein, and constitute a part of the specification, and together with the embodiments of the present application, they are used to explain the technical solutions herein, and do not constitute a limitation on the technical solutions herein.

1 is a schematic cross-sectional structural diagram of a fixing structure of a drift tube according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional structural diagram of an interdigital drift tube accelerator according to an embodiment of the present invention.

Among them, the corresponding relationship between the reference numerals and the component names in Fig. 1 and Fig. 2 is:

1. Support base, 11. Matching hole, 2. Drift tube, 21. Positioning post, 22. First annular groove, 3. Electric seal, 4. Process end cap, 61. Installation end face, 62. First side face.

Detailed ways

In order to make the objectives, technical solutions and advantages of this document more clear, the embodiments of this document will be described in detail below with reference to the accompanying drawings. It should be noted that, the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to facilitate a full understanding of this document. However, this document can also be implemented in other ways different from those described herein. Therefore, the protection scope of this document is not limited by the specific embodiments disclosed below. .

The fixing structure of the drift tube provided by the embodiment of the present invention, as shown in FIG. 1 , includes: a support base 1 , a first side surface 62 of which is provided with a matching hole 11 ; a drift tube 2 , whose installation end surface 61 is protruded with a positioning column 21. The drift tube 2 is installed on the support base 1, and the positioning post 21 extends into the matching hole 11;

In the fixed structure of the drift tube, the first side 62 of the support base 1 is provided with a matching hole 11 , the installation end face 61 of the drift tube 2 is protruded with a positioning column 21 , the drift tube 2 is installed on the support base 1 , and the positioning column 21 It extends into the matching hole 11 and cooperates with the matching hole 11, so as to ensure the position of the drift tube 2 on the support base 1, and the electrical seal 3 is sealed between the installation end face 61 and the first side face 62 to better satisfy the The electrical sealing requirements of the drift tube 2 and the support base 1 are required; and this method is convenient for processing and low in cost.

The positional relationship between the positioning column 21 and the matching hole 11 is ensured by the cooperation between the matching hole 11 and the positioning column 21 (which may be a clearance fit). The horizontal position of the tube 2 on the support base 1.

The cross-sections of the positioning post 21 and the matching hole 11 may be non-circular structures to prevent the two from rotating relative to each other; when the cross-sections of the positioning post 21 and the matching hole 11 are circular structures, a through hole may be provided on the mounting end face 61, A screw hole is provided on the first side surface 62 , and a screw (see the dotted line in FIG. 2 ) passes through the through hole and is screwed into the screw hole, so as to fix the drift tube 2 on the support base 1 .

Wherein, the through holes, screw holes and screws may be one group, and the through holes, screw holes and screws may also be multiple groups (preferably two groups arranged symmetrically) arranged at intervals along the circumferential direction of the positioning column 21, all of which can realize the present invention. The purpose of the application, the purpose of which does not deviate from the design idea of the present invention, will not be repeated here, and should all fall within the protection scope of the present application.

Specifically, as shown in FIG. 1 , the installation end face 61 is provided with a first annular groove 22 along the circumferential direction of the positioning post 21 , and the electrical seal 3 is installed in the first annular groove 22 to ensure that the drift tube 2 and the support seat are connected to each other. The electrical seal between 1 is more reliable. The electrical seal 3 may be an indium wire or the like.

Furthermore, as shown in FIG. 1 , the fixing structure of the drift tube further includes: a process end cover 4 , the matching hole 11 is a through hole, and the process end cover 4 seals the end of the through hole away from the drift tube 2 , in the fixing structure of the drift tube. When applied to the interdigital drift tube accelerator, the support base 1 is a cavity, and the drift tube 2 is located in the cavity. In order to better ensure the machining accuracy, the matching hole 11 is preferably processed from the outer surface of the cavity to the inside of the cavity, and the process end cap 4 is used to seal the outer end of the mating hole 11 .

Specifically, the fixing structure of the drift tube further includes: a seal, the matching hole 11 is a stepped hole, the stepped surface of the stepped hole faces away from the drift tube 2, the process end cover 4 is pressed against the stepped surface, and the seal is sealed on the process end cover 4 and the stepped surface, the hole section between the process end cover 4 and the drift tube 2 forms a closed space, for example, a vacuum chamber. The process end cover 4 may be provided with a second annular groove, and the sealing element is located in the second annular groove to position the sealing element and improve the assembly performance of the sealing element. The seal may be an O-ring. The positioning column 21 is provided with an internal thread hole, and the threaded end of the screw passes through the process end cover 4 and is screwed on the inner thread hole to fix the process end cover 4 (as shown in FIG. 2 ). Use the upper two screws and the lower one to fix the drift tube 2 and the support base 1, so as to increase the stress on the bottom surface of the drift tube 2.

The interdigital drift tube accelerator provided by the present invention, as shown in FIG. 2 , includes the fixing structure of the drift tube described in any of the above embodiments, the support base 1 is a cavity, and the drift tube 2 is located in the cavity.

The interdigital drift tube accelerator provided by the present invention has all the advantages of the fixed structure of the drift tube described in any of the above embodiments, and will not be repeated here.

To sum up, in the fixing structure of the drift tube provided by the present invention, the first side of the support seat is provided with a matching hole, the installation end face of the drift tube is protruded with a positioning column, the drift tube is installed on the support seat, and the positioning column extends. The electric seal is sealed between the installation end face and the first side, and the drift tube can use screws on the first side. It is fixed by means of locking, which better meets the electrical sealing requirements of the drift tube and the support seat; and this method is convenient for processing and low in cost. The drift tube and the support base can be fixed with two upper screws and one lower screw to increase the stress on the bottom surface of the drift tube.

In the description herein, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection ; can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this document can be understood according to specific situations.

In the description of this specification, the description of the terms "one embodiment," "some embodiments," "a specific embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included herein. in at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments disclosed herein are as above, the described contents are only the embodiments adopted to facilitate the understanding of this document, and are not intended to limit this document. Any person skilled in the art to which this article belongs, without departing from the spirit and scope disclosed in this article, can make any modifications and changes in the form and details of the implementation, but the scope of patent protection in this article must still be based on the appended The scope defined by the claims shall prevail.

Claims (7)

1. A drift tube fixing structure, comprising:

the first side surface of the supporting seat is provided with a matching hole;

the mounting end face of the drift tube is provided with a positioning column in a protruding mode, the drift tube is mounted on the supporting seat, and the positioning column extends into the matching hole;

an electrical seal electrically sealed between the mounting end face and the first side face; and

the process end cover is a through hole, one end of the through hole, far away from the drift tube, is sealed by the process end cover, an internal thread hole is formed in the positioning column, and a threaded end of a screw penetrates through the process end cover and is screwed on the internal thread hole so as to fix the process end cover;

the mounting end face is provided with a through hole, the first side face is provided with a screw hole, a screw penetrates through the through hole and is screwed in the screw hole, and the through hole, the screw hole and the screw comprise circumferential intervals along the positioning columns and are arranged on two groups of two sides of the through hole.

2. The drift tube fixing structure according to claim 1, wherein a first annular groove is formed in the mounting end surface and arranged along a circumferential direction of the positioning column, and the electric sealing member is mounted in the first annular groove.

3. The drift tube mounting structure of claim 2, wherein said electrical seal is an indium wire.

4. The drift tube fixing structure according to any one of claims 1 to 3,

the sealing member, the mating holes is the shoulder hole, the ladder face of shoulder hole is dorsad the drift tube, the technology end cover supports and presses on the ladder face, the sealing member is sealed the technology end cover with between the ladder face.

5. The drift tube attachment structure of claim 4 wherein said process end cap has a second annular groove formed therein, said seal being located in said second annular groove.

6. The drift tube attachment structure of claim 5, wherein said seal is an O-ring.

7. An interdigital drift tube accelerator, comprising a fixed structure of a drift tube according to any of claims 1 to 6, wherein said support base is a cavity, and said drift tube is located within said cavity.

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