JPH05129098A - Device for cooling internal conductor of coaxial type high frequency coupler - Google Patents

Abstract

PURPOSE:To perform cooing of an internal conductor end without arranging a cooling piping to penetrate a space between the internal and external conductors in a coaxial type high frequency coupler. CONSTITUTION:A partition panel 52 is placed in a space 25 between an internal conductor 22 and an external conductor 24 to form a shielding space 50 between the partition 52 and a vacuum hermetically sealing member 28. Holes 58, 56 are made into the internal and external conductors 22, 24 in the position of the shielding space 50 and a pipe 60 is placed inside the internal conductor 22. One end opening 60a of the pipe faces to the end surface 31 of the internal conductor, and the other end opening 60b communicates with the hole 58. When air is sucked from the hole 56 with a pump 62, it flows from a coupling portion 20a and the like between the internal and external conductors 22, 24 and passes through the internal conductor 22 thereby cooling its end surface 31 and after passing through the pipe 60, and air is discharged through the hole 58, the shielding space and the hole 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling an inner conductor of a coaxial type high frequency coupler for supplying high frequency energy to a high frequency acceleration cavity of a particle accelerator. Cooling air can be supplied without disturbing the electric field.

[0002]

2. Description of the Related Art A coaxial high-frequency coupler is used, for example, in a synchrotron device to supply microwave energy to a high-frequency accelerating cavity. FIG. 2 shows a coaxial type high frequency coupler used in the high frequency accelerating cavity of the synchrotron device. The high-frequency acceleration cavity 10 is provided in the middle of a vacuum container (storage ring) 12 around which an electron beam orbits. The high-frequency acceleration cavity body 14 is composed of a cylindrical container whose center axis is the orbital position of the electron beam.
The high-frequency acceleration cavity body 14 includes a cylindrical acceleration electrode 16,
18 are arranged facing each other. A coaxial type high frequency coupler 21 at the tip of the coaxial waveguide 20 is inserted and fixed to the side surface of the high frequency acceleration cavity body 14. The coaxial waveguide 20 includes an inner conductor 22 and an outer conductor 24 coaxially, and the tips of the inner conductor 22 and the outer conductor 24 are electrically connected by a caplin group 26 and face the inside of the high-frequency acceleration cavity body 14. .. A space 25 between the inner conductor 22 and the outer conductor 24 and a space 27 in the inner conductor 22 are under atmospheric pressure, and a vacuum sealing member 28 such as ceramic is internally provided for vacuum sealing with the vacuum container 12. The conductor 22 and the outer conductor 24 are joined by brazing. The tip of the internal conductor 22 is also vacuum-sealed to the vacuum container 12.

The microwave is the inner conductor 2 of the coaxial waveguide 20.
When propagating between 2 and the outer conductor 24, the magnetic field 10 is generated around the caplin group 26 by being radiated from the caplin group 26 at the tip thereof. Then, by resonating with the magnetic field 30, a magnetic field 32 is generated in the high-frequency acceleration cavity 10, and an electric field 34 is generated between the acceleration electrodes 16 and 18 by the magnetic field 32 to accelerate the electron beam in the vacuum container 12.

A tuner 36 for adjusting the resonance frequency is arranged on another side surface portion of the high-frequency acceleration cavity body 14. In the tuner 36, a plunger 40 is housed in a recess 38, and a motor is driven by a drive unit 42, so that the arrow A
The resonance frequency is adjusted by moving in and out of the cavity 11 as shown in FIG.

[0005]

In the coaxial type high frequency coupler 21, the tip of the inner conductor 22 is heated by high frequency energy. Therefore, cooling the inner conductor 22 with water or air can be considered. However, if the cooling pipe is introduced from the outside between the inner and outer conductors 22 and 24 to be guided to the inner conductor 22 inner space 25, this pipe passes through the space 27 between the inner and outer conductors 22 and 24. The high frequency electric field formed in 27 may be disturbed, and short circuit, discharge, heat generation, etc. may occur.

The present invention solves the above-mentioned problems in the prior art so that cooling air can be supplied into the inner conductor without disturbing the high frequency electric field in the space between the inner and outer conductors to cool the tip portion thereof. The present invention is intended to provide an inner conductor cooling device for a coaxial type high frequency coupler.

[0007]

SUMMARY OF THE INVENTION The present invention provides a coaxial type high frequency coupler in which an inner conductor and an outer conductor are coaxially arranged, and a space between these conductors is sealed by a vacuum sealing member in the vicinity of a tip end portion thereof. A partition plate that axially partitions the space between the inner conductor and the outer conductor to form a shielding space with the vacuum sealing member, and a hole formed in the inner conductor at the position of the shielding space. A hole formed in the outer conductor at the position of the shielding space, and the one end opening facing the end face of the inner conductor housed in the inner conductor and the other end opening formed in the inner conductor A pipe communicating with the hole and through the inside of the inner conductor to the end face thereof, from there through the inside of the pipe through the hole of the inner conductor into the shielding space, and from there through the hole of the outer conductor. The path to the outside or In the reverse path is made by including an air supply means for flowing the air.

[0008]

According to the present invention, it passes through the inside of the inner conductor to reach the end face thereof, then passes through the inside of the pipe through the hole of the inside conductor to the shielding space, and then passes through the hole of the outside conductor. Since the air is flowed through the path extending to the outside of the inner conductor or the opposite path, the end portion of the inner conductor can be effectively cooled. And according to this, since the partition plate can be uniformly arranged on the entire circumference of the space between the inner and outer conductors by a disc-shaped Teflon or the like, the cooling pipe is partially passed through the space between the inner and outer conductors. It is possible to prevent a short circuit or the like without disturbing the high frequency electric field as in the case.

[0009]

FIG. 1 shows an embodiment of the present invention. The coaxial waveguide 20 comprises an inner conductor 22 and an outer conductor 24 coaxially,
The coaxial high-frequency couplers 21 at the tips of the inner conductor 22 and the outer conductor 24 are electrically connected by a caplin group 26 and face the inside of the high-frequency acceleration cavity body 14. Inner conductor 2
2 and the space between the outer conductor 24 and the inner conductor 2
The space 27 in 2 is under atmospheric pressure, and a vacuum sealing member 28 such as ceramic is brazed 29 between the inner conductor 22 and the outer conductor 24 for vacuum sealing with the inside of the high-frequency acceleration cavity body 14. It is joined. The end face 31 of the inner conductor 22 is also vacuum-sealed with respect to the high-frequency acceleration cavity 14.

The microwave is the inner conductor 2 of the coaxial waveguide 20.
2 propagates between the outer conductor 24 and the outer conductor 24, and is radiated from the caplin group 26 of the coaxial high-frequency coupler 21.
Resonant with this, a magnetic field is generated in the high-frequency acceleration cavity body 14 to accelerate the electron beam in the vacuum container 12 (FIG. 2).

In the space 25 between the inner and outer conductors 22 and 24 on the upper side (atmosphere side) of the vacuum sealing member 28, this space 25 is partitioned in the axial direction to form a shielding space 50 with the vacuum sealing member 28. A partition plate 52 is provided for this purpose. For example, as shown in the plan view of FIG. 3, the partition plate 52 is configured by fitting discs 52a and 52b of Teflon or the like in a half-divided structure into the groove 54 of the internal conductor 22. The partition plate 52 can also serve as a disc-shaped support plate that is normally disposed in the space 25 to coaxially support the inner and outer conductors 22 and 24. This support plate is usually formed with a through hole in the up-down direction for venting air, but here, this through hole is closed and used.

At the position of the shielding space 50 in FIG. 1, holes 58 and 56 are opened in the inner and outer conductors 22 and 24, respectively. A pipe 60 made of copper or vinyl is arranged in the inner conductor 22. One end opening 60 a of the pipe 60 faces the inner conductor end face 31, and the other end opening 60 b communicates with the hole 58 of the inner conductor 22. A suction pump 62 communicates with the hole 56 of the outer conductor 24.

In the above structure, when the pump 62 is sucked, the air 68 flows in through the gap of the connecting portion 20a of the coaxial waveguide 20 or the like. That is, in the connecting portion 20a, the inner and outer conductors 22, 24 are connected by fitting the tubular connecting members 64, 66, etc., but since there is some clearance, air enters from there. Alternatively, an air intake hole may be formed in the inner and outer conductors 22 and 24 at any position above the partition plate 52 to take in air from there.

The air 68 taken from the outside passes through the inside of the inner conductor 22 to cool the vicinity of the end thereof, and passes through the inside of the pipe 60 from the lower end opening 60a of the pipe 60 into the hole 58, the shielding space 50 and the hole 56. Exhausted through.

According to the above construction, it is not necessary to pass a cooling pipe through the space 25 between the inner and outer conductors 22 and 24, and the inner and outer conductors are evenly arranged in the entire space 25 in the same manner as a support plate for coaxially supporting the inner and outer conductors. Since it is only necessary to dispose the partition plate 52 provided in the space 25, it is possible to prevent a short circuit or the like without disturbing the high frequency electric field in the space 25.

Although the pump 62 is a suction pump in FIG. 1, it may be a discharge pump. In that case, air 6
8 flows in a route opposite to the above. Further, in this case, a plurality of pipes 60 are prepared, and the openings 60b are formed in the inner conductor 22.
Are arranged so as to be aligned at a constant interval, and the direction thereof is directed toward the vacuum sealing member 28, air having a large flow velocity is blown to the vacuum sealing member 28, and the vacuum sealing member 2
8 can be expected to improve the cooling efficiency.

[0017]

Other Embodiments In the embodiment shown in FIG. 1, air is sucked or discharged through the holes 56, but as shown in FIG. 4, a cavity 70 is formed so as to surround the connecting portion 20a of the inner and outer conductors 22 and 24. It is also possible to draw air into the cavity 70 by sucking or discharging the cavity 70 with the pump 62. In this case, when the air flows in or out through other connecting portions of the coaxial waveguide 20 or other openings, the partition plate 52 is used.
A partition plate 72 similar to the above may be provided.

[0018]

As described above, according to the present invention, the inner conductor is passed through the inner conductor to the end surface thereof, and then the pipe is passed through the inner conductor through the hole of the inner conductor to the shielding space. Since the air flows from the path through the hole of the outer conductor to the outside thereof or vice versa, the end portion of the inner conductor can be effectively cooled.
And according to this, since the partition plate can be uniformly arranged on the entire circumference of the space between the inner and outer conductors by a disc-shaped Teflon or the like, the cooling pipe is partially passed through the space between the inner and outer conductors. It is possible to prevent a short circuit or the like without disturbing the high frequency electric field as in the case.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing the structure of a high-frequency acceleration cavity.

FIG. 3 is an exploded plan view of a partition plate 52 shown in FIG.

FIG. 4 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 21 coaxial type high frequency coupler 22 inner conductor 24 outer conductor 25 space between inner and outer conductors 28 vacuum sealing member 50 shielding space 52 partition plate 56 hole formed in outer conductor 58 hole formed in inner conductor 60 pipe 60a one end opening 60b Opening of the other end 62 Pump (air supply means)

Claims (1)

[Claims] 1. A coaxial type high-frequency coupler in which an inner conductor and an outer conductor are coaxially arranged, and a space between the inner conductor and the outer conductor is sealed by a vacuum sealing member in the vicinity of a tip end portion of the inner conductor and the outer conductor. A partition plate that axially partitions the space between to form a shielding space between the vacuum sealing member, a hole formed in the internal conductor at the position of the shielding space, and a position of the shielding space. A hole formed in the outer conductor; a pipe housed in the inner conductor, the one end opening facing the end face of the inner conductor, and the other end opening communicating with the hole formed in the inner conductor; A path from inside the inner conductor to the end face, from there through the inside of the pipe from the hole in the inner conductor to the shielding space, and from there through the hole in the outer conductor to the outside or vice versa. Flow air through Inner conductor cooling apparatus of a coaxial high-frequency coupler comprising; and a gas supply means.