JPH0650960Y2 - High frequency multipole linac - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a high frequency multipole linear accelerator, and more particularly to a high frequency multipole linear accelerator having a mechanism for adjusting the position of electrodes.

<Prior Art> Generally, for example, a high-frequency multipole linear accelerator has four electrodes 102 ... 102 extending in the acceleration direction of particles P fixed inside a cylindrical tank 101, as shown in FIG. ing.

In this type of accelerator, the acceleration performance is 4 electrodes 10
It depends on the positional accuracy of the tips of the 2 ... 102, but it was very difficult to obtain the positional accuracy when each electrode 102 of the long object is fixed to the inner wall of the tank 101.

Therefore, conventionally, in order to improve the above-mentioned positional accuracy, a mechanism for adjusting the positions of the tips of the electrodes 102 ... 102 is provided. For the adjusting mechanism, one using a screw,
There is a method using a shim.

First, a screw type adjusting mechanism will be described. The mechanism is, for example, as shown in a sectional view of an essential part of FIG.
A plurality of electrode support members 103 are provided on the wall body 1 at a predetermined interval along the particle acceleration direction, and the electrode 10 is attached to the electrode support member 103.
2 is fixed by a push screw 111 to support the electrode 102 at a predetermined position in the tank 101, and the electrode 102 is tilted by tightening or loosening the push screw 111 to adjust the position of its tip. ing.

In addition, between the electrode 102 and the inner wall surface of the tank 101, an electrode
A conductive contact 109 that extends in the longitudinal direction of 102 is inserted so that electrical contact between the electrode 102 and the tank 101 is achieved. In addition, the pins 112 and 113 are connected to the electrode 102 when assembled.
And for positioning the electrode support member 103.

Next, a method using a shim will be described. This method is shown in FIG. 5, for example.
A shim having a predetermined thickness is inserted between the inner wall surface (C portion) of the electrode 102 and one side of the electrode 102 is pushed up by the shim.
This is a method of tilting to adjust the position of its tip.

<Problems to be solved by the invention> By the way, according to the above-mentioned screw type adjusting mechanism, the tank 10
Due to the strength of item 1 and the like, it is not possible to provide a large number of electrode support members 103, and therefore the position of the tip of the electrode 102 cannot be precisely adjusted over the entire longitudinal direction thereof. Further, when the electrode 102 is largely tilted by the push screw 111, a gap may be formed between the electrode 102 or the inner wall surface of the tank 101 and the contact 109, and the electrical contact between the electrode 102 and the tank 101 may be poor. There is.

Further, according to the method using the shim described above, the shim is used as the electrode 10
If a large number of electrodes are inserted along the longitudinal direction of 2, the tip of the electrode 102 can be precisely adjusted over the entire longitudinal direction, but the operation is difficult and enormous time is required.

An object of the present invention is to precisely adjust the position of the tip of each electrode over the entire longitudinal direction while maintaining electrical contact between the tank and each electrode, and to perform the adjustment work easily. An object of the present invention is to provide a high-frequency multipole linear accelerator equipped with an adjustable mechanism.

<Means for Solving Problems> A configuration for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to an embodiment.
The inner wall surface 1b of the tank 1 and the longitudinal side surfaces 21a of each electrode 2;
22a, extending along the particle acceleration direction,
Further, a plurality of setscrews 35 ... 35 provided at predetermined intervals along the direction are used to fasten the inner wall surface 1b and the side surfaces 21a, 22a of the electrode 2 so as to make electrical contact with each other. Contact members (contact blocks) 41, 42 are provided, and each contact member 41, 4 is provided by the fastening force of each set screw 35 ... 35.
2 is configured to be able to apply a predetermined force between the wall of the tank 1 and the electrode 2 while maintaining electrical contact with the inner wall surface 1b of the tank 1 and the side surfaces 21a, 22a of the electrode 2. I am trying.

<Operation> For example, if the set screw 35 on the right side of the electrode 2 is further tightened, the contact member 41 exerts a tension force between the inner wall surface 1b of the tank 1 and the surface 21a of the electrode 2, and the electrode 2 is left. If you tilt it to the side and tighten the set screw 35 on the left side,
The tension force of the contact member 42 tilts the electrode 2 to the right.
Here, even if the electrode 2 tilts to the right or left, the tank 1
The electrical contact between the wall of the electrode and the electrode 2 is maintained.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a detailed view of part A thereof, and FIG. 3 is an overall front view of an embodiment of the present invention.

First, the overall configuration of the apparatus will be described with reference to FIGS. 3 and 1.

Flange 12a is fixed to both ends of the iron tank 1 by welding. Copper plating 1a having a predetermined thickness is applied to the inner wall surface of the tank 1.

End plates 12b are fixed to the respective flanges 12a by bolts / nuts 31 ... 31, 32 ... 32. On the contact surface between the flange 12a and the end plate 12b, a 0 ring 12c for keeping airtightness inside the tank 1 is narrowly provided.

The wall of the tank 1 is provided with four through holes 11 ... 11 at predetermined intervals along the direction in which the particles P are accelerated. Cylindrical support frames 5 ... 5 are inserted into the through holes 11 ... 11, respectively, and the support frames 5 ... 5 are fixed to the wall of the tank 1 by welding.

Electrode support members 3 ... 3 each having a solid circular cross section and formed in a flange 3b guard body are inserted into the four support frames 5 ... 5, and each electrode support member 3 ... 3 is inserted. Bolts to the wall of each support frame 5 ... 5 at its flange 3b.
It is fixed by 34 ... 34. This electrode support member 3 ...
Cooling water introduction paths 3a ... 3a are formed in each of the three.

The electrode 2 made of copper provided with the water channel 2a for cooling water is fixed to the electrode supporting members 3 ... 3 with bolts 33 ... 33, and the electrode supporting member 3 is arranged so that its longitudinal direction is along the direction of accelerating the particles P. ... 3 is supported at a predetermined position in the tank 1. Then, the cooling water from the outside of the tank 1 is supplied to the water passage 2a of the electrode 2 through the cooling water passages 3a ... 3a of the electrode supporting members 3 ...

It should be noted that 0-rings 6 ... 6, 7 ... 7, and 0-rings 6 ... 6, 7 ... 7, and between the contact surfaces of the electrodes 2 and the electrode support members 3 ... 3 and between the electrode support members 3 ... 3 and the support frames 5 ... 5, respectively. 8 ... 8 are narrowly provided to prevent vacuum leak and cooling water leak in the tank 1.

Now, in the electrode 2, as shown in FIG. 1 and FIG.
Notches 21 and 22 are formed at both ends of the root portion along the longitudinal direction of the electrode 2.

A plurality of screw holes 21c are formed on the surfaces 21b and 22b of the notches 21 and 22 at predetermined intervals along the longitudinal direction of the electrode 2.
... 21c, 22 ... 22c is worn.

Between the surfaces 21a, 22a of the respective cutouts 21, 22 and the inner wall surface 1b of the tank, the respective surfaces 21a, 22a and the inner wall surface 1 of the tank 1 are provided.
a contact block 41 made of copper, which is in contact with b via the contacts 9a, 9b made of copper alloy extending along the longitudinal direction of the electrode 2 and has a predetermined length in the longitudinal direction of the electrode 2;
42 are provided, and each of these contact blocks 41, 42
Is fastened to the electrode 2 by a plurality of setscrews 35 ... 35 and supported by the surfaces 21b and 22b of the cutouts 21 and 22 and the inner wall surface 1 of the tank 1. In this state, the cutouts are formed.
It is designed so that a gap is formed between the surfaces 21b and 22b of 21,22.

With this configuration, for example, if the set screw 35 on the right side of the electrode 2 is further tightened, the contact block 41 causes the electrode 2
Between the inner surface 21a of the tank 1 and the inner wall surface 1b of the tank 1, the right side of the electrode 2 is pushed up and the electrode 2 tilts to the left, or if the set screw 35 on the left side of the electrode 2 is further tightened. , The electrode 2 tilts to the right. Here, even when the electrode 2 is tilted leftward or rightward, the contact blocks 41, 42 are connected to the inner wall surface 1b of the tank 1 via the contacts 9a, 9b.
Also, since it abuts against the surfaces 21a, 22a of the electrode 2, the electrical connection between the wall of the tank 1 and the electrode 2 does not become defective. As shown in FIG. 3, the contact blocks 41, 42 are provided over the entire area of the electrode 2 in the longitudinal direction, and the set screws 35 ... 35 are also arranged at a predetermined pitch along the longitudinal direction of the electrode 2. Since it is provided, any position in the longitudinal direction of the electrode 2 can be tilted leftward or rightward, and the tip of the electrode 2 can be precisely adjusted over the entire region in the longitudinal direction.

In this embodiment, as shown in FIG. 1, the electrode support member 3 is fixed to the wall of the support frame 5 fixed to the wall of the tank 1 by the bolts 34 ... 34 at its flange 3b. Therefore, if a shim (not shown) is inserted in the contact surface between the flange 3b and the end surface of the support frame 5, the electrode 2 can be translated in the radial direction of the tank 1, and the flange 2
If a mechanism (not shown) for pressing 3b in the direction orthogonal to the radial direction of the tank 1 is provided, the electrode 2 can be moved in the direction orthogonal to the radial direction of the tank 1. Even when such parallel movement is performed, the electrical contact between the wall of the tank 1 and the electrode 2 can be maintained by further tightening the setscrews 35 on both sides of the electrode 2 or on one side thereof.

Further, in the present embodiment, each contact block 41, 42 is configured to contact the surfaces 21a, 22a of the electrode 2 and the inner wall surface 1b of the tank 1 via the contacts 9a, 9b.
9a and 9b are for improving the electrical contact between the wall of the tank 1 and the electrode 2, and do not necessarily have to be provided. For example, the portion provided with the contacts 9a and 9b may be formed in a round shape. The contact blocks 41, 42 are formed and the surfaces 21a, 2 of the electrode 2 are formed.
2a and the inner wall surface 1b of the tank 1 may be directly contacted.

Although the structure of one electrode 2 has been described above, it goes without saying that the other electrodes also have the same structure.

<Effect of the Invention> As described above, according to the present invention, a plurality of setscrews are provided between the inner wall surface of the tank and both side surfaces in the longitudinal direction of the electrode so as to electrically contact both surfaces. A contact member made of a conductive material that is fastened and extends along the longitudinal direction of the electrode is provided, and each contact member maintains electrical contact between the wall of the tank and the electrode, and Since it is configured to adjust the position, it is possible to precisely adjust the position of the tip of each electrode over the entire longitudinal direction of each electrode, and the adjustment work adjusts the tightening degree of each set screw. It can be performed easily and in a relatively short time. Here, when a flange is formed on each of a plurality of support members that support each electrode at a predetermined position in the tank, and each support member is configured to be detachably attached to the tank wall body using this flange, for example, each If a shim or the like is inserted into the mounting surface of the flange, each electrode can be translated in the radial direction of the tank, and if a mechanism that can press each flange in a direction orthogonal to the radial direction of the tank is provided, It is also possible to translate each electrode in that direction.

Moreover, even when these parallel movements are performed, the electrical connection between the wall of the tank and each electrode can be secured.

[Brief description of drawings]

1 is a longitudinal sectional view of an essential part of an embodiment of the present invention, FIG. 2 is a detailed view of part A thereof, FIG. 3 is an overall front view of an embodiment of the present invention, and FIG. 4 is a high frequency quadrupole linear accelerator. Fig. 5 is a perspective view showing a general example of Fig. 5, and Fig. 5 is a longitudinal sectional view of an essential part showing a conventional example of a mechanism for adjusting the position of an electrode. 1 …… Tank 1b …… Its inner wall surface 2 …… Electrodes 21a, 22a …… The surface of the notch 3 …… Electrode support member 3b …… Its flange 35 …… Set screw 41, 42 …… Contact block 9a, 9b ... Contact

Claims (3)

[Scope of utility model registration request] 1. A tank and a plurality of electrodes which extend in a direction for accelerating particles and which are supported at predetermined positions in the tank by a plurality of supporting members provided on the wall of the tank. In the high-frequency multipole linac, between the inner wall surface of the tank and both side surfaces in the longitudinal direction of each of the electrodes, they extend along the particle acceleration direction and are provided at predetermined intervals along the direction. A contact member made of a conductive material, which is fastened so as to make electrical contact with the inner wall surface and each side surface by a plurality of setscrews, is provided, and each contact member is electrically connected by the fastening force of each set screw. High-frequency multipole linear accelerator, characterized in that a predetermined force can be applied between the wall of the tank and each of the electrodes while maintaining constant contact. 2. The utility model registration claim according to claim 1, wherein the contact member is configured to contact the electrodes and the wall of the tank through a contact made of a conductive material. High frequency multipole linear accelerator. 3. A utility model registration request, characterized in that a flange is formed on each of said support members, and each of said support members is detachably mounted on the wall of said tank using said flange. The high frequency multipole linear accelerator according to the first or second aspect.