JPH0629100A - Vacuum container for accelerator - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a structure in which eddy current loss can be reduced, deformation due to a difference in internal and external pressures of a container is prevented, and manufacturability is good. [Structure] A thin-walled pipe divided in the axial direction was assembled with a structure in which a circular arc bulged toward the vacuum side, and reinforcing ribs 10 were joined together and welded at a welded portion 7. [Effect] Since a thin-walled vacuum container is used, the resistance value can be increased and eddy current loss can be reduced, and since the vacuum side has a structure that expands in an arc shape, it has a structure that is rigid against external pressure, Prevents deformation due to the difference in internal and external pressure. Further, since the axial welded portion serves as a reinforcing rib, the axial rigidity is increased, core runout is suppressed, and the welded portion is only in the axial direction, so that a long duct can be manufactured.

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 an accelerator for passing a beam of a high energy particle accelerator such as a synchrotron accelerator.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional thin-walled vacuum container disclosed in, for example, Japanese Examined Patent Publication No. 1-16000, and in the drawing, the outer circumference of a vacuum container 11 made of stainless steel having an elliptical cross section and a thickness of 0.3 mm. Reinforcing ribs 2 fixed to each other by brazing at a constant pitch are provided. Further, the protrusion 3 is formed by extruding from the inside of the vacuum container 11 at a constant pitch so as to have a curvature of the beam trajectory radius R. FIG. 8 is for explaining the processing method of the protruding portion 3. In the drawing, a semi-elliptical block 4 inscribed in the vacuum container 11 and a protruding chevron at the tip are slid through the holes on the block 4 side. And the pressurizing port 6 provided so as to apply pressure from the rear of the processing jig 5 with a fluid such as water or oil. 3 is formed. The vacuum container 11 configured as described above is a synchrotron accelerator (not shown).
When used in, the inside is kept in a high vacuum and forms a circular orbit of high energy accelerating particles. Here, when performing synchrotron acceleration, there is a problem of eddy current loss in the wall of the metal tube. Therefore, a thin metal tube having a high resistivity such as stainless steel is used to reduce this loss.

[0003]

Since the conventional vacuum container for an accelerator is constructed as described above, it is difficult to form a long tube, and the processing rate of the protruding portion cannot be increased so much. There was a problem that it could not be applied to a synchrotron with a small curvature.

The present invention has been made in order to solve the above problems, and is for an accelerator in which eddy current loss can be reduced, deformation is not caused by a difference between internal pressure and external pressure of vacuum and atmosphere, and core runout is suppressed. The purpose is to obtain a vacuum container.

[0005]

In the accelerator vacuum container according to the first aspect of the present invention, an axially divided arcuate tube is assembled as a structure in which an arc is expanded on the vacuum side of a thin-walled vacuum container. It is a thing.

The accelerator vacuum vessel according to the second aspect of the present invention comprises a thin-walled vacuum vessel which is horizontally divided in the axial direction and a combination which is vertically divided in the axial direction.
It has a structure in which they are alternately connected.

The accelerator vacuum vessel according to the third aspect of the present invention has a structure in which a reinforcing rib is provided in the circumferential direction of a thin vacuum vessel and is reinforced in the axial direction through a reinforcing material for preventing runout. .

A vacuum container for an accelerator according to a fourth aspect of the present invention has a structure in which reinforcing ribs are provided in the circumferential direction of a thin vacuum container and pleats are provided in the axial direction of the tube to prevent runout due to unevenness. It is a thing.

A vacuum container for an accelerator according to a fifth aspect of the present invention has a structure in which a plurality of tapered short tubes having pleated reinforcing ribs are connected in the circumferential direction of a thin vacuum container.

[0010]

In the first aspect of the present invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced and the arc side is bulged toward the vacuum side. In addition, since the containers divided in the axial direction are joined together, the manufacturability is good and a long duct can be manufactured. In addition, the joint portion becomes a reinforcing rib, and core runout is also suppressed.

According to the second aspect of the present invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and the vacuum container is divided horizontally into a combination of the vacuum container and the vertical combination in the axial direction. Since the combined pieces are connected in an alternating manner, manufacturability is good. In addition, the joint portion in the axial direction serves as a reinforcing rib, which prevents deformation due to the difference in internal and external pressures and suppresses core runout.

In the third aspect of the present invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and since the reinforcing ribs are provided in the circumferential direction, the deformation due to the difference between the internal and external pressures can be prevented. Further, since the core runout preventing reinforcing member passing through the axial direction is provided, core runout is also suppressed.

In the fourth aspect of the present invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and since the reinforcing ribs are provided in the circumferential direction, the deformation due to the difference between the internal and external pressures is prevented. Further, since the pleats are provided in the axial direction, the runout of the core is also suppressed. Since the axial pleats are formed by pressure molding, the manufacturability is good, and in addition, the gap between the pipe and the rib can be kept small by the outward compressive force of the pipe, so that the brazing property is good.

According to the fifth aspect of the present invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and since the corrugated reinforcing ribs are provided in the circumferential direction, the deformation due to the difference between the internal and external pressures can be achieved. In addition, since the structure is such that a tapered short pipe is connected, it is not necessary to provide a joint for brazing, and the manufacturability is good.

[0015]

【Example】

Example 1. 1 is a perspective view showing a first embodiment of the present invention, in which 1 is a vacuum container, 10 is an axial reinforcing rib, and 7 is a welded portion. That is, in the vacuum container 1, thin wall pipes divided into four in the axial direction are assembled in a structure in which the vacuum side bulges into an arc, and are rib-welded in the axial direction. In the above structure, since a thin vacuum container is used,
The resistance value increases, the eddy current loss can be reduced, and since the vacuum side has a structure that bulges in an arc shape, it has rigidity against external pressure and can prevent deformation due to the difference between internal and external pressure. . Further, since the axial welded portion serves as a reinforcing rib, the axial rigidity is increased, core runout is suppressed, and the welded portion is only in the axial direction, so that a long duct can be manufactured.

Example 2. Embodiment 2 FIG. 2 is an exploded perspective view a and an assembled perspective view b showing Embodiment 2 of the present invention.
Reference numeral 1 is a vacuum container, 1a and 1b are unit vacuum tanks, 10 is an axial reinforcing rib, and 7 is a welded portion. That is, this vacuum container 1
A unit vacuum chamber 1a obtained by dividing a thin pipe horizontally into an axial direction and welding, and a unit vacuum chamber 1b obtained by dividing a thin pipe vertically into an axial direction and welding are connected alternately. In the above structure, since a thin vacuum vessel is used, the resistance value increases, the eddy current loss can be reduced, and the short tube with horizontal ribs in the axial direction and the short tube with vertical ribs in the axial direction can be used. Since they are connected alternately, by appropriately determining the length of the short pipe, the part without ribs can be increased in rigidity by the ribs of the short pipe sandwiching it, and it can be deformed due to the difference in internal and external pressure. Prevent runout. Further, since the short pipes with the horizontal ribs and the vertical ribs are connected in an alternating manner, the ribs can be joined without interfering with each other, thereby improving the manufacturability.

Embodiment 3. FIG. 3 is a perspective view showing a third embodiment of the present invention. In the figure, 1 is a vacuum container, 2 is a reinforcing rib, and 8 is a support. In this vacuum container 1, a reinforcing rib 2 is brazed to a thin pipe. The support column 8 has a structure in which it is fixed through the reinforcing ribs 2. With the above structure,
Since a thin vacuum container is used, the resistance value can be increased and eddy current loss can be reduced.In addition, the reinforcing ribs in the circumferential direction provide high rigidity in the ribbed portion and the rib spacing even in the ribless portion with an appropriate distance. Since it is possible to increase the rigidity by the above, it is possible to prevent deformation due to the difference in internal and external pressure. Further, since the columns that pass through the ribs are provided to prevent the ribs from swinging together, core runout is suppressed.

Example 4. 4 is a perspective view showing Embodiment 4 of the present invention, in which 1 is a vacuum container, 2 is a reinforcing rib, and 10 is an axial reinforcing rib. It is brazed, and the axial reinforcing ribs 10 are brazed between the reinforcing ribs 2. In the above structure, since a thin vacuum container is used,
As the resistance value increases and eddy current loss can be reduced,
Due to the circumferential reinforcing ribs, the part with ribs has high rigidity, and the part without ribs can also be increased in rigidity by setting the rib interval to an appropriate distance, thus preventing deformation due to the difference in internal and external pressure. You can Furthermore, since the axial reinforcing ribs are provided, the rigidity in the axial direction is high and the runout of the core is suppressed. Since the reinforcing rib in the axial direction is a thin plate, it can be bent in a direction perpendicular to the surface of the reinforcing rib in the axial direction, so that it can be applied to an arc-shaped duct.

Example 5. 5 is a perspective view showing a fifth embodiment of the present invention. In the figure, 1 is a vacuum container, 2 is a reinforcing rib, and 9 is a fold for axial reinforcement.
Has a structure in which a thin-walled pipe is pressure-molded to form a pleats 9 for axial reinforcement, through which the reinforcing ribs 2 are inserted, and then brazed. In the above structure, since the thin-walled vacuum container is used, the resistance value increases and the eddy current loss can be reduced, and the reinforcing ribs in the circumferential direction increase the rigidity of the ribbed portion and the ribless portion of the rib. Since the rigidity can be increased by setting the interval to an appropriate distance, it is possible to prevent the deformation due to the difference between the internal pressure and the external pressure. Furthermore, since the pleats are provided in the axial direction, the rigidity in the axial direction is high and the core runout is suppressed. The axial pleats have good manufacturability because a thin-walled pipe is pressure-molded. Also, since the pleats serve as springs and the pipes tend to bulge outward, an appropriate compressive force is applied to the ribs. Works, the gap between the rib and the pipe can be kept small, and the brazing property is good.

Example 6. FIG. 6 is a sectional view showing a sixth embodiment of the present invention. In the figure, 1 is a vacuum container, 1c is a unit vacuum tank, 2 is a reinforcing rib, and this vacuum container 1 has a tapered thin pipe. It has a structure in which unit vacuum chambers 1c having pressure-formed reinforcing ribs 2 are connected. In the above structure, since a thin vacuum container is used, the resistance value increases and the eddy current loss can be reduced, and the rib-shaped reinforcing ribs that are pressure-molded in the circumferential direction are attached, so that the rib portion is rigid. The rigidity can be increased even at a portion without ribs by setting an appropriate distance between the ribs, and therefore deformation due to a difference in internal and external pressures can be prevented.
Further, because of the structure of connecting the tapered short pipes, it is not necessary to provide a joint for brazing, and the manufacturability is also good.

[0021]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and the vacuum side has a structure that bulges in an arc shape, so that the deformation due to the difference between the internal and external pressures is prevented. Furthermore, since the welded portion in the axial direction serves as a reinforcing rib, the rigidity in the axial direction is increased and the runout of the core is suppressed. Also, since the welding location is only in the axial direction, a long duct can be manufactured.

According to the second invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and the short tube with the rib horizontally in the axial direction and the short tube with the rib vertically in the axial direction are used. Since they are connected in a staggered manner, rigidity can be increased, deformation and core runout due to the difference in internal and external pressures are prevented, and short pipes with horizontal and vertical ribs are connected in a staggered manner, so that the ribs interfere with each other. Since it can be joined without any problems, manufacturability is also good.

According to the third invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced and the rigidity can be increased by the reinforcing ribs in the circumferential direction, so that the deformation due to the difference between the internal and external pressures can be prevented. Further, since the core runout preventing reinforcing material passing in the axial direction is applied to suppress the runout of the ribs, the runout of the core is suppressed.

According to the fourth aspect of the invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and the reinforcing ribs in the circumferential direction can increase the rigidity, so that the deformation due to the difference between the internal and external pressures can be prevented. Further, since the pleats are provided in the axial direction of the pipe, the rigidity in the axial direction is high and the runout of the core is suppressed. The axial folds can be easily manufactured by pressure molding a thin-walled pipe, which facilitates manufacturability, and the compressive force of the fold structure allows the gap between the ribs and the pipe to be kept small. The property is also good.

According to the fifth aspect of the invention, since the thin-walled vacuum container is used, the eddy current loss can be reduced, and since the corrugated reinforcing ribs are provided in the circumferential direction, the rigidity can be increased and the internal and external pressures can be increased. Prevents deformation due to the difference. Further, since the tapered short pipe is connected, it is not necessary to provide a joint for brazing, and the manufacturability is good.

[Brief description of drawings]

FIG. 1 is a perspective view showing an accelerator vacuum container according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view a and an assembled perspective view b showing a vacuum container for an accelerator according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a vacuum container for an accelerator according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a vacuum container for an accelerator according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a vacuum container for an accelerator according to a fifth embodiment of the present invention.

FIG. 6 is a perspective view showing an accelerator vacuum container according to a sixth embodiment of the present invention.

FIG. 7 is a perspective view showing a conventional accelerator vacuum container.

FIG. 8 is a diagram showing a conventional method of processing a vacuum container for an accelerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum container 1a, 1b, 1c Unit vacuum tank 2 Reinforcing rib 7 Welding part 8 Support 9 Axial reinforcement pleats 10 Axial reinforcement rib

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Tokoshi 1-2-2 Wadasaki-cho, Hyogo-ku, Kobe Sanritsu Electric Co., Ltd. Kobe Works (72) Shintaro Fukumoto Wadazaki, Hyogo-ku, Kobe 1-2-1 Machi Sanryo Electric Co., Ltd. Kobe Works

Claims (5)

[Claims] 1. A vacuum for an accelerator, characterized in that, in a thin-walled pipe-shaped vacuum container, at least three arc-shaped members are combined in a structure in which the arcs are bulged on the vacuum side, and their joint ribs are welded to each other. container. 2. A thin pipe-shaped vacuum container, characterized in that a short tube with a rib horizontally in the axial direction and a short tube with a rib vertically in the axial direction are connected in a staggered manner in the axial direction. Vacuum container for accelerator. 3. A thin-walled pipe-shaped vacuum container, wherein thin-walled short tubes each having a reinforcing rib in the circumferential direction are connected in the axial direction and a reinforcing material for preventing runout which passes through each of the ribs in the axial direction is applied. Vacuum container for accelerator characterized by. 4. A vacuum vessel for an accelerator, characterized in that, in a thin-walled pipe-shaped vacuum vessel, reinforcing ribs are welded to the periphery of a thin-walled tube provided with reinforcing pleats having an uneven shape in the axial direction. 5. A vacuum vessel for an accelerator, characterized in that, in a thin pipe-shaped vacuum vessel, a plurality of tapered short tubes provided with pleated reinforcement ribs in the circumferential direction are connected.