JPS62136799A - Vacuum beam duct for particle accelerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a vacuum beam duct for a particle accelerator, and in particular, it ensures an ultra-high vacuum property and a fork beam duct when colliding electrons and positrons. This invention relates to a vacuum beam duct that can efficiently extract particles generated by collapse.

"Prior art and its problems" In particle accelerators such as the Tristan project, a part of the acceleration ring is used as a collision experiment site, and at the collision experiment site, the accelerator ring is configured as shown in Figure 3. It is necessary to take out a group of particles released from the vacuum beam duct 1 as shown by the arrow by the fork collapse when electrons and positrons collide head-on, and to efficiently reach the detector 2 outside the vacuum beam duct 1. There is sex.

By the way, it is necessary for the vacuum beam duct 1 to maintain the inside of the duct in an ultra-high vacuum state (for example, 10 ''''' Torr or more) and to construct the duct inner surface with a highly conductive material, and these requirements have been met. Aluminum is used to satisfy this requirement.

However, aluminum has a relatively large atomic mass of 2
7, it tends to be easily attenuated when the particle group passes through. On the other hand, in order to improve the permeability of particle groups, it is more advantageous to make the aluminum layer thinner, but if the aluminum layer is made thinner, the mechanical strength will be impaired. Therefore, when the vacuum beam duct is made of aluminum, there are problems such as the need to delicately adjust the thickness of the aluminum layer to such an extent that mechanical strength is not impaired.

The present invention aims to effectively solve these problems.

"Means for Solving the Problems" The present invention provides a carbon fiber-reinforced plastic layer on the outside of an aluminum cylindrical body constituting a part of an acceleration ring, and also provides a carbon fiber-reinforced plastic layer that integrally covers the aluminum cylindrical body. A reinforcing layer made of a honeycomb structure etc. is integrally placed on the outside of the aluminum layer, ensuring ultra-high vacuum properties, and
Mechanical strength is ensured by a carbon fiber reinforced plastic layer and a reinforcing layer made of a honeycomb structure, etc., and the particles generated by the collapse are guided outside through the openings of the honeycomb, allowing the particles to pass through. It is something that makes you

"Example" Hereinafter, an example of the vacuum beam duct for a particle accelerator of the present invention will be described based on FIGS. 1 and 2.

When a part of the acceleration ring is used as a collision experiment site, the vacuum beam duct l that constitutes that part is an aluminum cylindrical body 3 for maintaining an ultra-high vacuum, as shown in one embodiment in Fig. 1.
, a carbon fiber reinforced plastic layer 4 that integrally covers the outer circumferential surface of the aluminum cylindrical body 3 in close contact with the aluminum cylindrical body 3, and a reinforcing layer made of a honeycomb structure or the like that is integrally disposed outside the carbon fiber reinforced plastic layer 4. 5, and the outside of the reinforcing layer 5 is integrally covered with a protective layer 6 made of carbon fiber reinforced plastic.

The aluminum cylindrical body 3 has a straight cylindrical shape and is formed as thin as possible to maintain an ultra-high vacuum (however, in order to connect the aluminum cylindrical body 3 to other parts of the acceleration ring, , aluminum flanges, etc. are provided at both ends).

The carbon fiber reinforced plastic layer 4 has an aluminum cylindrical body 3
The aluminum cylindrical body 3 is formed to be relatively thicker than the aluminum cylindrical body 3.

The reinforcing layer 5 is made thin by slicing the honeycomb structure, etc., as shown in FIG. ), and is relatively thicker than the carbon fiber reinforced plastic layer 4. Further, the partition walls of the honeycomb structure are set to have a large aperture ratio, and are made of a polymeric material having excellent adhesiveness to the carbon fiber reinforced plastic layer 4, such as aramid resin.

The protective layer 6 protects the outer side of the partition wall in the reinforcing layer 5 from being damaged by external force, and has a sandwich structure in which the reinforcing layer 5 is sandwiched between the carbon fiber reinforced plastic layer 4 and the protective layer 6, so that the mechanical This aims to improve the strength of the objective.

The plastic used to form the carbon fiber reinforced plastic layer 4 is preferably a thermosetting epochino resin, for example.

Such a vacuum beam duct l has a particle plastic layer 4 and a protective layer 6, but by reducing the thickness of these layers, it is possible to dramatically improve the permeability of particle groups. Become.

In other words, an aluminum layer with an atomic weight of 27 is made thin enough to satisfy the conditions of maintaining an ultra-high vacuum state and ensuring high conductivity, and each atom constituting the outer carbon fiber reinforced plastic layer is The atomic weight of the compound is made relatively small. C, which makes up carbon fiber, is an atom ff
112, and each plastic material constituting the Plus Deck layer has an atomic weight of 1, an atomic weight of l, and an atom of 0]16, and an atom of Nff114, which are significantly smaller than aluminum, so these The permeability of particle groups in carbon fiber reinforced plastics consisting of atoms is improved.

Further, since it is easy to set a large aperture ratio of the honeycomb structure constituting the reinforcing layer 5, the attenuation 1 when the particle group passes through the reinforcing layer 5 can be made extremely small.

As a result, the effective wall thickness can be reduced compared to the case of an aluminum layer alone, and their synergistic effect increases the permeability of the particle group.

"Effects" As explained above, according to the vacuum beam duct for a particle accelerator of the present invention, (a) the vacuum beam duct for a particle accelerator has a honeycomb structure consisting of an aluminum cylindrical body and a carbon fiber reinforced plastic layer covering the outside thereof; As a composite structure consisting of a reinforcing layer consisting of body, etc.
Since the aluminum layer, which has a relatively large atomic weight, is made thin, it is possible to maintain ultra-high vacuum properties and ensure conductivity, as well as improve the permeability of particle groups.

(b) It is easy to ensure the overall mechanical strength by the carbon fiber reinforced plastic layer and the reinforcing layer, and it is also easy to increase the aperture ratio of the honeycomb structure etc. that constitutes the reinforcing layer. The permeability of the particle group is less likely to be impaired.

It is possible to achieve excellent effects such as:

[Brief explanation of drawings]

Fig. 1 is a partially sectional perspective view showing the essential parts of an embodiment of a vacuum hem duct for a particle accelerator according to the present invention, Fig. 2 is a view taken along the line II-IT in Fig. 1, and Fig. 3 is a fork view. It is an explanatory diagram of a generation phenomenon. 1...Vacuum beam duct, 2...Detector, 3...Aluminum cylindrical body, 4...Carbon fiber reinforced plus deck layer, 5... ... Reinforcement layer, 6...
...protective layer.

Claims (1)

[Claims] A carbon fiber reinforced plastic layer is provided on the outside of the aluminum cylindrical body that constitutes a part of the acceleration ring, and a reinforcing layer made of a honeycomb structure or the like is integrally provided on the outside of the carbon fiber reinforced plastic layer. A vacuum beam duct for a particle accelerator, which is characterized by the following: