JPS59118280A - Production of long sized accelerating tube - Google Patents

Abstract

PURPOSE:To produce a long sized accelerating tube having high reliability and high performance at a low cost by grasping a coupling cavity consisting of two discs and spacer between two accelerating tubes and welding and coupling the flange parts of the accelerating tubes and an annular coupling metal. CONSTITUTION:A coupling cavity 3 manufactured by welding and coupling discs 1, 1 slotted 1a on the outside peripheral surfaces and having aperatures at the center and an annular spacer 2 having plural vacuum suction holes 2a is fitted and grasped in the notched parts provided on the opposed end faces of two accelerating tubes 4, 4 to be coupled; at the same time, a coupling ring 5 attached with a vacuum suction pipe 6 in the aperture part 5a is fitted between flange parts 4a and 4a. While cooling water 7 is circulated in the accelerating tube 4, the ring 5 and the flange parts 4 are welded and coupled, whereby the long-sized accelerating tube which is mechanically and electrically surely coupled is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a long acceleration tube used in a linear accelerator or the like.

In a linear accelerator, it is efficient to perform short-noise, high-current type acceleration by supplying high power to a long acceleration tube.

There are two conceivable methods for manufacturing such a long accelerator tube, as described below.

(1) A long acceleration tube is manufactured by mechanically connecting acceleration tubes approximately 2 m in length with bolts, nuts, etc.

(Formerly, long acceleration tubes are manufactured directly by electroforming, brazing, etc.)

However, the above-mentioned +11 and I old methods each have the following drawbacks.

That is, regarding (I), mechanical connections using bolts, nuts, etc., remain structurally variable and are subject to aging and lack mechanical and electrical reliability. Also,(
Regarding 11), when directly manufacturing an accelerating tube using current techniques such as electroforming and brazing, the maximum length is about 3 m.
, If the length is longer than t2, handling (workability) due to equipment
A lot of bad things happen with high quality.

The present invention has the above drawbacks! This was done in order to solve this problem, and the aim is to provide a method for manufacturing a long accelerator tube that is highly reliable, high performance, and inexpensive to manufacture.

In order to eliminate the various drawbacks mentioned above and manufacture a long acceleration tube, it is possible to manufacture a long acceleration tube by connecting all the acceleration tubes of about 2 m in length by a method other than the mechanical connection method using bolts, nuts, etc. is considered to be good.

That is, the method for manufacturing a long accelerator tube of the present invention involves attaching two disks each having a slit on the outer peripheral surface and an annular spacer having a plurality of vacuum suction holes to opposing outer edges of the disks. A joint cavity made by welding and joining the J-sa in contact with each other is sandwiched between two acceleration tubes, and a ring-shaped joint is connected to the flanges of the two acceleration tubes and the vacuum suction tube. The feature is that the metal fittings are welded together.

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

First, two disks 1.1 each having a slit 1a on the outer circumferential surface and an opening in the center, and an annular spacer 2 having a plurality of vacuum suction holes 2m, . The two disks 1.1 and the spacer 2 are welded together so that the spacer 2 comes into contact with the opposing outer edges of the two disks 1.1 and spacer 2, thereby producing a combined cavity.

Next, this coupling cavity 3 is connected to the two acceleration tubes 4 to be coupled.
. Note that a vacuum suction tube 6 is connected to the opening 5a provided in the coupling ring 5. Cooling water 7, 7 is circulated within the acceleration tube 4.4 up to the vicinity of the coupling cavity 3.

Subsequently, the coupling ring 5 and the flange portions 4a, 4a of the acceleration tubes 4, 4 are welded together to manufacture a long acceleration tube Z.

According to the above method, the coupling ring 5 and the acceleration tube 4
．． The compressive stress generated when welding and joining the flange parts 48 and 4a of 4 is transmitted to the slits la and la provided in the disk 1.1 of the coupling cavity 3, generating a spring effect, and the two acceleration tubes 4 on both sides The end face of .4 and the coupling cavity 3 are in reliable contact, and the electrical contact is also reliable. As a result, it is possible to prevent microwave discharge due to poor contact between the two, unnecessary microwave reflection at the coupling portion, and unnecessary phase shift at the coupling portion.

Further, by adjusting the inner diameter of the spacer 2 of the coupling cavity 3, it is possible to provide the function of an l'J phase shifter. In other words, the phase shift when microwaves propagate inside the accelerating tube increases cumulatively in proportion to the length of the accelerating tube, but by adjusting the inner diameter dimension of the spacer 2 of the coupling cavity 3, the phase shift can be adjusted. The deviation can be corrected.

Furthermore, the vacuum suction holes 2a provided in the spacer 2 of the coupling cavity 3 allow vacuum to be drawn from the center of the long acceleration tube, so the degree of vacuum can be raised to the same level as that of an acceleration tube of about 2 m length. Can be done.

As described in detail above, according to the present invention, it is possible to provide a method for manufacturing a long accelerator tube that is highly reliable, has high performance, and is inexpensive to manufacture.

[Brief explanation of the drawing]

The figure is a cross-sectional view of a long acceleration tube manufactured by a method according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Disk, 1a... Slit, 2... Spacer, 2a... Vacuum suction hole, 3... Coupling cavity, 4...
...Acceleration tube, 4a...Flange part, 5...Coupling ring, 6...Vacuum suction tube, 7...Cooling water.

Claims (1)

[Claims] Two joint cavities manufactured by welding together two disks with slits on their outer peripheral surfaces and an annular Nupesa having a plurality of vacuum suction holes. A method for manufacturing a long acceleration tube, comprising: sandwiching the acceleration tubes between the two acceleration tubes, and welding together the flange portions of the two acceleration tubes and an annular coupling fitting to which a vacuum suction tube is connected.