JPH07296995A - Vacuum vessel - Google Patents

Abstract

PURPOSE:To heighten the heat insulating effect at the time of baking by furnishing an inner cylinder having through holes as a heating means at the periphery of the track for charged particles, and providing an outer cylinder which forms a heat insulative space in such a way as enclosing the inner cylinder. CONSTITUTION:A vacuum vessel 21 has an inner cylinder 22 approx. in the form of a genuine circle, and its its periphery, through holes 23 are provided at a certain spacing in the circumferential direction. These through holes 23 constitute a passage to transport a warm water in the axial direction along the inner cylinder 22 as a heating means which raises the temp. of the inner wall surface 22a of the inner cylinder 22 at the time of baking. On the outside of the inner cylinder 22, an outer cylinder 25 approx. in the form of a genuine circle is concentrically provided through coupling parts 24 in such a way as enclosing the inner cylinder. With reference to the inner cylinder 22, this outer cylinder 25 forms a heat insulation space 26 which is partitioned by the coupling parts 24 in the circumferential direction. Even though warn water is passed through the holes 23 for performing the baking process, a high heat insulating effect is ensured owing to the provision of space 26 as enclosing the inner cylinder 22, which leads to enhancement of the heating efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum container for forming orbits of charged particles such as an accelerator, and more particularly to a vacuum container capable of improving a heat insulating effect during baking.

[0002]

2. Description of the Related Art Baking is performed to increase the degree of vacuum in a vacuum container for forming particle trajectories in a particle accelerator.

For example, FIG. 3 shows a vacuum container of a light extraction line of an accelerator.
In order to increase the degree of vacuum inside, a U-shaped mounting portion 2 for mounting a rod-shaped heater (not shown) is formed on the outer peripheral portion of the vacuum container 1. If a heater is sandwiched between the mounting portions 2 and the inner wall surface portion 3 of the vacuum container 1 is heated and heated in a vacuum state, the molecules that have entered the inner wall surface portion 3 are released, and this is discharged as a gas. In this case, the degree of vacuum when the vacuum container 1 is evacuated can be increased.

[0004]

By the way, during such baking, since the vacuum container 1 is heated from the outside by the heater, the heat radiation to the atmosphere is large,
There is a problem of low heating efficiency. Also, in order to reduce heat radiation to the atmosphere, a heat insulating material (not shown) is provided on the outer peripheral portion of the vacuum container 1.
It becomes necessary to wrap around, and there is a problem that the cost becomes high and the attachment of the heat insulating material becomes troublesome.

The present invention was devised to effectively solve the above problems. It is an object of the present invention to provide a vacuum container capable of enhancing the heat insulating effect during baking and achieving labor saving and cost reduction.

[0006]

According to the present invention, an inner cylinder which forms a trajectory of charged particles and the like and which has a through hole for a heating means for baking along the outer peripheral portion along the axial direction, and the outer circumference of the inner cylinder. The outer cylinder forms a heat insulating space along the circumferential direction between the inner cylinder and the inner cylinder to cover the portion with a predetermined gap. Specifically, the heat insulating space is formed at a predetermined interval along the circumferential direction between the inner cylinder and the outer cylinder integrally formed by extrusion molding.

[0007]

In the above structure, the vacuum container has a double-cylinder structure including an inner cylinder and an outer cylinder, and a heat insulating space is formed between the inner cylinder and the outer cylinder to enhance the heat insulating effect. It is a thing. Further, the heat insulating space portion is easily formed by extrusion molding.

[0008]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 shows an example of a particle accelerator. This accelerator 11 causes electrons generated by an electron generator 12 to enter a ring-shaped storage ring 14 through an incident part 13 and is orbited by the storage ring 14. Then, the radiated light extracted through the light extraction line 15 in the tangential direction is used by the device 16
It is supposed to lead to. For example, light extraction line 1
Reference numeral 5 is composed of a vacuum container 21 as shown in FIG.

In particular, the vacuum container 21 has an inner cylinder 22 of a substantially perfect circle as shown in FIG. 1, and four outer peripheral holes of the inner cylinder 22 are equidistantly provided with four through holes 23 in the circumferential direction. This through hole 23 forms a hot water transfer passage for axially transferring hot water along the inner cylinder 22 as a heating means for heating and raising the inner wall surface 22a of the inner cylinder 22 during baking.

An outer cylinder 25 is formed on the outside of the inner cylinder 22 so as to be concentric with the connecting portion 24 and is concentric with the outer cylinder 25. The outer cylinder 25 and the inner cylinder 22 are arranged in the circumferential direction. A heat insulating space portion 26 partitioned by the connecting portion 24 is formed along the line. In this embodiment, for example, four heat insulating space portions 26 are formed between the inner cylinder 22 and the outer cylinder 25 at a predetermined interval and are partitioned by the connecting portion 24 in the circumferential direction.

Therefore, the through hole 2 is used for baking.
Even when hot water is allowed to pass along 3, the heat insulating space 26 is formed so as to cover the outer side of the inner cylinder 22, so that the heat insulating effect is enhanced and the heating efficiency can be enhanced. Further, since the conventional heat insulating material is not required, labor saving and cost reduction can be achieved during baking.

The heat insulating space 26 may be formed between the inner cylinder 22 and the outer cylinder 25 by connecting the inner cylinder 22 and the outer cylinder 25, which are formed of separate pieces, by the connecting portion 24. Since it is a simple structure of a double cylinder, it may be formed between the inner cylinder 22 and the outer cylinder 25 that are integrally formed. In the case of integral molding, for example, an aluminum material can be extruded as an extruded material to obtain the heat insulating space portion 26 partitioned by the connecting portion 24 between the inner cylinder 22 and the outer cylinder 25.

In the above embodiment, the light extraction line 1
5 has been described, the vacuum container constituting the storage ring 14 or the incidence part 13 is also composed of the inner cylinder 22 and the outer cylinder 25, and the space between the inner cylinder 22 and the outer cylinder 25. You may comprise so that the heat insulation space part 26 may be formed. Further, the heating means is configured by passing warm water through the through hole 23 formed in the inner cylinder 22, but the heating means is configured by heating the inner cylinder 22 by inserting a rod-shaped heater into the through hole 23. May be.

Further, if the heat insulating space 26 is evacuated, the heat insulating effect of the heat insulating space 26 can be enhanced. Therefore, the vacuum pump 27 may be connected to the heat insulating space 26. In this case, both ends of the vacuum container 21 in the axial direction are closed to seal the heat insulating space portions 26 and the heat insulating space portions 26.
A pipe 28 is connected to the heat insulating space 26 to reduce the atmospheric pressure.

[0016]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) In claim 1, since the heat insulating space is formed between the inner cylinder and the outer cylinder, the heat insulating effect at the time of baking is improved, the heating efficiency can be improved, and the labor saving and Cost reduction can be achieved.

(2) In the second aspect, the heat insulating space can be easily formed by extrusion molding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a vacuum container of the present invention.

FIG. 2 is a plan view showing a main part of an accelerator.

FIG. 3 is a cross-sectional view showing a conventional vacuum container.

[Explanation of symbols]

 21 vacuum container 22 inner cylinder 23 through hole 25 outer cylinder 26 heat insulating space portion

Claims (2)

[Claims] 1. An inner cylinder which forms a trajectory of charged particles and the like and which has a through hole for a heating means along the axial direction in the outer peripheral portion, and an outer peripheral portion of the inner cylinder with a predetermined gap therebetween. A vacuum container comprising: an outer cylinder that covers the inner cylinder and forms an insulating space between the inner cylinder and the inner cylinder along the circumferential direction. 2. The heat insulating space portion is formed at a predetermined interval along a circumferential direction between an inner cylinder and an outer cylinder integrally formed by extrusion molding.
The vacuum container described.