JPH1116700A - Vacuum chamber for accelerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a light and accurate vacuum chamber for accelerator by forming a beam chamber forming member, which has a beam chamber for generating a magnetic field inside thereof, and an air discharge chamber forming member, which has an air discharge chamber forming super vacuum inside thereof, of separate members, and bonding both the members for integration. SOLUTION: A beam chamber forming member 13, which has a beam chamber 7 inside thereof and in which a communication hole 17 is provided in one side wall 16 and which has a nearly rectangular cross section, is formed. An air discharge chamber forming member 14, which is formed of a separate member from the beam chamber forming member 13 and which has an air discharge chamber 8 inside thereof and of which side part is provided with a slit 18 having a space nearly equal to the thickness dimension of the beam chamber forming member 13, is formed. A part of the beam chamber forming member 13 at the communication hole 17 side thereof is inserted into the slit 18 of the air discharge chamber forming member 14, and bonded by welding 20 so as to integrate both the members 13, 14, and a vacuum chamber for accelerator is thereby obtained. A beam chamber 7 of a thin material, which forms a magnetic field with magnet train 4, 5, is thereby easily formed with a high strength and high dimensional accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum chamber for an accelerator, and more particularly, to a vacuum chamber for an accelerator capable of achieving weight reduction and high accuracy.

[0002]

2. Description of the Related Art Electrons moving at a speed close to the speed of light emit electromagnetic waves (light) called radiated light in the tangential direction of the trajectory of electrons when their traveling direction is forcibly bent by a magnetic field or an electric field. There is a property that.

In recent years, as a means for generating high-brightness radiated light utilizing the above-mentioned properties of electrons, research on an insertion light source called an undulator device or the like provided in a linear portion such as an electron storage ring of a synchrotron or a linear accelerator has been studied. Development is underway. Note that the name of the insertion light source is derived from the fact that this device is inserted and arranged in a linear portion such as an electron storage ring.

FIG. 2 is a structural view showing the principle of the insertion light source. A plurality of magnets 3 such as permanent magnets having the same shape are provided above and below a linear vacuum chamber main body 2 which serves as a path for an electron beam 1. And the magnet rows 4 and 5 arranged in a straight line so that their polarities are alternately different from each other.
Are arranged so that the polarities of the magnets 3 that face each other across are different from each other.

The magnet rows 4 and 5 are supported so as to be able to move toward and away from the vacuum chamber body 2 via a magnet position adjusting mechanism (not shown). Incidentally, reference numeral 6 denotes emitted light.

In the insertion light source having the above-described configuration, the sine waves are directed inside the vacuum chamber main body 2 in the vertical direction and along the longitudinal direction of the vacuum chamber main body 2 by the magnet rows 4 and 5 arranged opposite to each other. A magnetic field having a periodic period is generated.

[0007] The period of the magnetic field is determined by the length of each magnet 3 with respect to the longitudinal direction of the vacuum chamber main body 2.

When the radiation 6 is generated, the inside of the vacuum chamber main body 2 which forms a part of an electron storage ring or the like such as a synchrotron (not shown) is set to 10 ^-10 To.
After maintaining an ultra-high vacuum state of about rr, a high-energy electron beam 1 accelerated by acceleration means such as an electron accelerator (not shown) is incident on the vacuum chamber main body 2 in the longitudinal direction.

Then, when the electron beam 1 travels inside the vacuum chamber main body 2, the electron beam 1 is affected by the magnetic field generated by the magnet rows 4 and 5. Meanwhile, meandering in the left-right direction corresponding to the period of .phi., And as a result, radiation 6 traveling tangentially from the bent portion of the trajectory of electron beam 1 is emitted.

As described above, when the radiation 6 is emitted,
Since the magnetic field that gives the meandering to the electron beam 1 plays an important role, a magnet position adjusting mechanism (not shown) is provided, and the magnetic field is adjusted by moving the magnet arrays 4 and 5 closer to or farther from the vacuum chamber body 2. The influence can be changed.

Then, as the magnet rows 4 and 5 approach each other,
Since a strong magnetic field is obtained, as shown in FIGS. 3 and 4, the beam chamber 7 is formed to be flat in the vertical direction, and when the beam chamber 7 is flattened, the exhaust efficiency is reduced due to an increase in exhaust resistance and the like. In order to compensate for a decrease in the exhaust efficiency of the beam chamber 7, an exhaust chamber 8 having a large volume communicating with the beam chamber 7 is integrally provided on a side portion of the beam chamber 7, and the exhaust is performed from the exhaust chamber 8. A complicated and long vacuum chamber body 2 is used.

The vacuum chamber body 2 having the complicated shape is
Conventionally, when made of aluminum, it is formed by extrusion (FIG. 3), and when made of stainless steel, half halves 9, 10 each having a vertically divided shape are formed by cutting. Weld the halves 9 and 10 together (welded sections 11 and 1).
2) to be formed integrally (FIG. 4).

[0013]

However, the vacuum chamber for an accelerator having the above-described beam chamber and the exhaust chamber having a complicated shape has the following problems.

That is, since the total sectional area of the beam chamber 7 and the exhaust chamber 8 communicating with each other increases, the thickness of the vacuum chamber main body 2 must be increased in order to maintain these spaces. There is an inevitable increase in weight.

In order to generate a desired magnetic field, high accuracy is required in the beam chamber 7, but the beam chamber 7 and the exhaust chamber 8 are unbalanced right and left and have a cross-sectional shape. However, when aluminum is formed by extrusion, the desired accuracy cannot be obtained.

Also, when stainless steel is formed by cutting and welding, desired working accuracy cannot be obtained for the same reason as described above.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vacuum chamber for an accelerator capable of achieving weight reduction and high accuracy in view of the above-mentioned circumstances.

[0018]

According to the present invention, a beam chamber forming member 13 having a beam chamber 7 therein and an exhaust chamber 8 inside thereof are provided.
And a vacuum chamber for an accelerator, wherein the beam chamber forming member 13 and the exhaust chamber forming member 14 are joined and integrated with each other.

In this case, the beam chamber forming member 13
Has a substantially rectangular closed cross section, and the exhaust chamber forming member 14 has a substantially rectangular closed cross section.
A communication hole 17 communicating between the inside and the outside is formed, and a slit portion 18 is formed at a side portion of the exhaust chamber forming member 14 at an interval substantially equal to the thickness dimension of the beam chamber forming member 13. The beam chamber forming member 13 is provided in the slit portion 18.
May be partially inserted to fix the inserted portion by welding.

The beam chamber forming member 13 has a substantially rectangular closed cross section, and the exhaust chamber forming member 14 has a substantially C-shaped cross section, and a communication hole 17 communicating between the inside and the outside is formed in one side wall 16 of the beam chamber forming member 13. Then, one side of the beam chamber forming member 13 may be partially inserted into the C-shaped opening 19 of the exhaust chamber forming member 14, and the inserted portion may be fixed by welding.

According to the above means, the following effects can be obtained.

Beam chamber forming member 1 for forming beam chamber 7
3 and the exhaust chamber forming member 14 forming the exhaust chamber 8 are formed as separate members, and then the two are integrated, so that the beam chamber forming member 13 and the exhaust chamber forming member 14 are integrated.
Are simplified, and manufacturing is facilitated.

Further, the beam chamber forming member 13 is required to have high accuracy in generating a desired magnetic field, but since the cross-sectional shape is simplified and small, it can be used even when extruding aluminum. Also, even when stainless steel is processed by various manufacturing methods, it can be manufactured with high accuracy.

Further, since the beam chamber forming member 13 has a closed cross section, the strength is increased, so that the beam chamber forming member 13 can be made thin, and the overall weight can be reduced. .

Further, since the beam chamber forming member 13 can be made thin, the heat input of the welded portion 20 between the beam chamber forming member 13 and the exhaust chamber forming member 14 can be reduced by that much, and the distortion can be reduced. A small welding result can be obtained.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

Since the principle of the insertion light source and the basic shape of the vacuum chamber for the accelerator are the same as those shown in FIGS. 2 to 4, the same parts are denoted by the same reference numerals and their description is omitted.

According to the present invention, the beam chamber forming member 13 having the beam chamber 7 therein and the exhaust chamber forming member 14 having the exhaust chamber 8 therein are formed as separate members. The feature is that the exhaust chamber forming member 14 is joined and integrated.

More specifically, a flat beam chamber 7 is provided inside.
And a communication path forming space 1 extending from the beam chamber 7 to one side.
5, a long beam chamber forming member 13 having a substantially rectangular closed cross section is provided. The beam chamber forming member 13 is formed with high precision so that a desired magnetic field can be generated.
The communication passage forming space 15 does not penetrate the one side wall 16 of the beam chamber forming member 13.

In addition to the beam chamber forming member 13, a long exhaust chamber forming member 14 having an exhaust chamber 8 inside and having a substantially rectangular closed cross section or a substantially C-shaped cross section is provided. Since the exhaust chamber forming member 14 is not required to have such high accuracy, it is formed with normal accuracy.

Then, one side wall 1 of the beam chamber forming member 13
6, a large number of communication holes 17 for communicating the communication path forming space 15 with the outside are formed at a predetermined pitch in the longitudinal direction of the beam chamber forming member 13.

Next, in the case where the exhaust chamber forming member 14 has a rectangular closed cross section, the slit portions 18 are provided on the side portions of the exhaust chamber forming member 14 at intervals substantially equal to the thickness dimension of the beam chamber forming member 13.
Are formed in the longitudinal direction.

When the exhaust chamber forming member 14 has a C-shaped cross section, the beam chamber forming member 13 is formed in the slit portion 18 of the exhaust chamber forming member 14 or in the C-shaped opening 19.
Is partially inserted so that the inserted portion is welded and fixed (welded portion 20).

Next, the operation will be described.

The process of obtaining emitted light by the insertion light source is the same as in the case of FIG.

In the present invention, the beam chamber forming member 13 forming the beam chamber 7 and the exhaust chamber forming member 14 forming the exhaust chamber 8 are formed as separate members, and thereafter, they are integrated. Therefore, the shapes of the beam chamber forming member 13 and the exhaust chamber forming member 14 are simplified, respectively, and the manufacturing is facilitated.

Further, the beam chamber forming member 13 is required to have high accuracy in generating a desired magnetic field, but since the cross-sectional shape is simplified and small, even when extruding aluminum. Also, even when stainless steel is processed by various manufacturing methods, it can be manufactured with high accuracy.

Further, since the beam chamber forming member 13 has a closed cross section, the strength is increased, so that the beam chamber forming member 13 can be made thin, and the overall weight can be reduced. .

Further, since the beam chamber forming member 13 can be made thin, the heat input to the welded portion 20 between the beam chamber forming member 13 and the exhaust chamber forming member 14 can be reduced.
Accordingly, a welding result with less distortion can be obtained.

It should be noted that the present invention is not limited only to the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0042]

As described above, according to the vacuum chamber for an accelerator of the present invention, an excellent effect that weight reduction and high precision can be achieved can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of an embodiment of the present invention.

FIG. 2 is a partially broken schematic perspective view showing the principle of an insertion light source.

FIG. 3 is a longitudinal sectional view when a conventional vacuum duct main body is made of aluminum.

FIG. 4 is a longitudinal sectional view when a conventional vacuum duct body is made of stainless steel.

[Explanation of symbols]

 7 Beam Chamber 8 Exhaust Chamber 13 Beam Chamber Forming Member 14 Exhaust Chamber Forming Member 16 One Side Wall 17 Communication Hole 18 Slit 19 Opening

Claims (3)

[Claims] A beam chamber forming member (13) having a beam chamber (7) therein and an exhaust chamber forming member (14) having an exhaust chamber (8) inside are formed as separate members. A vacuum chamber for an accelerator, wherein a forming member (13) and an exhaust chamber forming member (14) are joined and integrated. 2. The beam chamber forming member (13) has a substantially rectangular closed cross section, and the exhaust chamber forming member (14) has a substantially rectangular closed cross section, and one side wall (16) of the beam chamber forming member (13) has:
A communication hole (17) communicating between the inside and the outside is formed, and a beam chamber forming member (1) is formed on a side portion of the exhaust chamber forming member (14).
Slits (18) at intervals substantially equal to the thickness of (3)
Is formed, and the slit portion (1) of the exhaust chamber forming member (14) is formed.
The vacuum chamber for an accelerator according to claim 1, wherein one side of the beam chamber forming member (13) is partially inserted into the beam chamber forming member (8), and the inserted portion is fixed by welding. 3. The beam chamber forming member (13) has a substantially rectangular closed cross section, and the exhaust chamber forming member (14) has a substantially C-shaped cross section. A communication hole (17) is formed, and one side of the beam chamber forming member (13) is partially inserted into the C-shaped opening (19) of the exhaust chamber forming member (14) to insert the inserted portion. The vacuum chamber for an accelerator according to claim 1, wherein the vacuum chamber is fixed by welding.