JPH0441600Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-frequency contactor for an accelerator that is used to easily conduct a high-frequency current flowing through the inner wall surface of a vacuum container.

[Prior Art] In a large accelerator, a beam flows inside the vacuum vessel and a high frequency current flows on the inner wall surface of the vacuum vessel, so a high frequency contactor is provided in the middle of the vacuum vessel to easily conduct this current.

The vacuum vessel is incorporated into a superconducting electromagnet,
Since it is cooled with liquid helium and thermally contracted, the high frequency contactor provided in the vacuum container is required to be capable of absorbing the thermal contraction.

In order to meet such demands, conventionally, as shown in FIG. 3, one end of the high frequency contactor 6 is fixed to the inner surface of the bellows 5 between the vacuum containers 4, and the other end is made slidable.

[Problems to be solved by the invention] However, in the case where one end of the high-frequency contactor is slidable, the end of the contactor may be in contact with or not in contact with the inner surface of the bellows 5, causing discharge. Therefore, the high frequency current could not be conducted reliably.
Also, heat was generated during discharge.

Therefore, it is possible to fix both ends of the high-frequency contactor 6 in order to ensure conduction of the high-frequency current, but fixing both ends of the high-frequency contactor 6 in an extended state to the bellows 5 will not allow the vacuum vessel 4 to When contraction occurs, the high frequency contactor 6 is pulled from both ends, but since it has already been stretched, it cannot be absorbed. Therefore, it is possible to incorporate a bellows 7 in the middle of the high-frequency contactor 6 as shown in FIG. 4, but it is expected that the peaks of the bellows 7 will be plastically deformed and will not be able to fully stretch, making it difficult for the high-frequency current to flow. Ru.

In order to solve this problem, the present invention aims to provide a vacuum container that is fixed at both ends and that can easily follow the shrinkage of the vacuum container and expand.

[Means for Solving the Problems] The present invention has a cylindrical main body, in which a large number of cut grooves extending in the axial direction are formed at appropriate intervals in the circumferential direction, and a strip portion located between each cut groove is formed. Both ends of the main body are fixed to the inner surface of the bellows between the vacuum containers with the main body curved outward into a loop shape.

[Function] If the strips of the main body are bent outward at room temperature and both ends are fixed, each strip will easily expand when the vacuum container cools and contracts. When the vacuum container is contracted, the loop-curved strip portion expands and the high-frequency contactor body becomes cylindrical, making it easier for high-frequency current to flow. .

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, the high-frequency contactor of the present invention has a high-frequency contactor body 1 made of cylindrical Be-Cu, aluminum alloy, or other highly conductive material. A large number of cut grooves 2 are provided in the circumferential direction, and the strip portions 3 located between the adjacent cut grooves 2 are provided with sufficient elasticity, so that each strip portion 3 is curved outward in a loop shape. The main body 1 can be easily expanded and contracted by stretching or stretching linearly.

High frequency contactor I of the present invention with the above configuration
is positioned inside the bellows 5 integrally interposed in the vacuum container 4, and both ends are fixed to the inner surface of the bellows 5. In this case, when the vacuum container 4 is kept at room temperature as shown in the figure, each strip plate portion 3 is bent and fixed to the bellows 5 in a shortened overall length.

Now, when the vacuum vessel 4 is incorporated into a superconducting electromagnet and cooled with liquid helium, the vacuum vessel 4 begins to contract due to cold heat. Since the bellows 5 is fixed to the vacuum container 4, when the vacuum container 4 contracts and the vacuum containers 4 on both sides move away from each other in FIG. The high frequency contactor I of the present invention, which has both ends fixed at , also begins to elongate. Since the high-frequency contactor I is designed to be easily expandable and contractable by utilizing the elasticity of the strip plate portion 3, the entirety of the high-frequency contactor I is stretched in the axial direction by being pulled from both ends together with the bellows 5. When the vacuum container 4 has finished shrinking, each strip portion 3 will be in a linear shape or a state close to it, so
The high frequency contactor I has a substantially cylindrical shape.

[Effects of the invention] As described above, according to the high frequency contactor of the present invention, when the vacuum container is cooled and contracts, this contraction can be sufficiently absorbed, and the high frequency current can easily flow to ensure conduction. It has this excellent effect.

[Brief explanation of the drawing]

Fig. 1 is an embodiment of the high-frequency contactor of the present invention, Fig. 2 is a perspective view of the high-frequency contactor of the present invention showing its orientation when installed at room temperature, and Figs. 3 and 4 are conventional high-frequency contactors. It is an example figure of a contactor. I indicates the high frequency contactor of the present invention, 1 indicates the high frequency contactor main body, 2 indicates the cut groove, 3 indicates the strip portion, 4 indicates the vacuum container, and 5 indicates the bellows.

Claims (1)

[Scope of utility model registration request] A cylindrical main body is provided with a number of cut grooves extending from one end of the main body to the other end at appropriate intervals in the circumferential direction, and a band plate portion is formed between each cut groove, and is attached to a vacuum container. A high-frequency contactor for an accelerator, characterized in that both ends of the main body are fixed to the inner surface of a bellows.