JPH0448599A - High frequency multipolar linear-type accelerator - Google Patents

Abstract

PURPOSE:To provide a high frequency multipolar linear accelerator which is able to adjust the position of the tip part of each electrode precisely and further has a wide adjustment range and has an adjusting system easy to be designed by installing a contacting part made of a conductive material whose length is adjustable by a screw between a wall body of a tank and each electrode. CONSTITUTION:Between the inner wall face 1b of a tank l and each of both sides 21a in the longitudinal direction of each electrode 2, contacting parts 4 which are made of a conductive material and electrically contacted with the inner wall face 1b and each side 21a and whose length between them is adjustable by a screw (a screw part 42, nuts 43a, 43b, etc.) are arranged in a prescribed distance along the particle acceleration direction and while each of the contacting parts 4 keeps said electrical contact by adjustment by the screw, it provides the prescribed force between the wall of the tank l and each electrode 2.

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 equipped with a mechanism for adjusting the position of electrodes.

<Prior Art> Generally, in a high frequency multipole linear accelerator, as shown in FIG. 4, for example, four electrodes 102 . It has become.

In such a high-frequency multipole linear accelerator, two important points in terms of acceleration performance are the ability to finely adjust the position of the tip of each electrode and the ability to make electrical contact between the electrode and the inner wall of the tank.

Therefore, in this type of high-frequency multipole linear accelerator, the applicant has already provided a contact member between the internal wall surface of the tank and each electrode, which makes electrical contact with both by the fastening force of a set screw. By applying tension between the wall of the tank and each electrode using the tightening force of the set screw, the position of the tip of each electrode is adjusted while maintaining electrical contact between the tank and each electrode. We are proposing technology. (Utility Model Application No. 1-96700) <Problems to be Solved by the Invention> By the way, according to the technique of the above-mentioned Utility Model Application No. 196700, the tightening direction of the set screw is different from the direction in which the tension force is required. , the problem of a narrow range of position adjustment, and the difficulty of predicting the shape and dimensions of a contact member that will satisfy both reliable electrical contact and the desired position adjustment range at the design stage. Unless you actually try to assemble it, you won't know whether the above two conditions are satisfied or not.
Problems remain, such as the need to redesign the contact member in some cases.

The present invention has been made in view of these points, and it is possible to precisely adjust the position of the tip of each electrode while maintaining electrical contact between the tank and each electrode, and the adjustment range is wide. The present invention also aims to provide a high-frequency multipole linear accelerator equipped with an adjustment mechanism that is easy to design.

<Means for Solving the Problems> A configuration for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. Both longitudinal sides 21 of each electrode 2
a, the internal wall surface 1b and each side surface 21a are in electrical contact with each other, and the length between the two is a threaded portion 42.a. Contact members 4 made of a conductive material that can be adjusted by screws (43a, 43b, etc.) are arranged at predetermined intervals along the particle acceleration direction, and each contact member 4 can be brought into electrical contact by adjusting screws. The structure is characterized in that a predetermined force can be applied between the wall of the tank 1 and each electrode 2 while maintaining the same.

<Function> Basically, the inner wall surface 1b of the tank 1 and the surface 21 of the electrode 2
The position of the tip of each electrode 2 is adjusted by applying a tension force between the contact member 4 and the inner wall surface 1b of the tank with a screw. By having a structure in which the length between the screw and the side surface 21a can be adjusted, the force exerted by the screw can be made in the same direction as the direction in which the tension force should be applied.

<Example> Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a vertical sectional view of the main part of the embodiment of the present invention, and Fig. 2 is its A.
FIG. 3 is an overall front view of an embodiment of the present invention.

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

Flanges 12a are fixed to both ends of the iron tank 1 by welding. The inner wall surface of this tank 1 is coated with copper plating 1a having a predetermined thickness.

Each flange 12a has an end plate 12b.
are fixed by bolts and nuts 31...31, 32...32. An O-ring 12c for keeping the inside of the tank 1 airtight is fitted into the contact surface between the flange 12a and the end plate 12b.

Four through holes 11 are bored in the wall of the tank 1 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.
is fixed to the wall of the tank 1 by welding.

Electrode support members 3...3 each having a solid circular cross section and integrally formed with a flange 3b are inserted into the four support frames 5...5, and each support Frame 5・
... 5 is fixed to the wall body by bolts 34...34. Cooling water introduction passages 3a...3a are formed in each of the electrode support members 3...3.

The copper electrode 2 equipped with a water channel 2a for cooling water is fixed to the electrode support members 3...3 with bolts 33...33, and is arranged so that its longitudinal direction is along the direction in which the particles P are accelerated. It is supported at a predetermined position within the tank 1 by electrode support members 3...3. Cooling water from outside the tank 1 flows into the water channel 2a of the electrode 2 from the electrode support member 3...
3 cooling water channels 3a...3a.

In addition, an O-ring 6 is provided between the contact surface between the electrode 2 and each electrode support member 3...3 and between each electrode support member 3...3 and each support frame 5...5.・6.7...7 and 8...8 are fitted to prevent vacuum leakage and cooling water leakage inside the tank 1.

Now, as shown in FIGS. 1 and 2, the electrode 2 has
Notches 21 are formed along the longitudinal direction of the electrode 2 at both ends of its base. A plurality of contact members 4 are provided between the surface 21a of each notch 21 and the internal wall surface 1b of the tank.
... 4 are arranged at predetermined intervals along the longitudinal direction of the electrode 2, and the position of one end of each contact member 4 on the wall surface is regulated by a projection 1c on the inner wall surface of the tank 1.

The contact member 4 includes two metal blocks 41a and 41b,
A threaded portion 42 is inserted into a hole or a counterbore drilled at positions facing each other, and two nuts 43a are screwed into this threaded portion.

43b, and its metal block 41
a and the surface 21a of the electrode 2, and the metal block 41
Conductive buffer materials 44a and 44b are sandwiched between the inner wall surface 1b and the inner wall surface 1b of the tank, respectively. Further, a plate 45 made of a conductive material is bridged between the metal blocks 41a and 41b, and this plate 45 is provided with a conductive buffer material 46a to each block 41a and 41b.
and 46b, and are screwed together. This board 45
This ensures electrical connection between the metal blocks 41a and 41b.

In the above configuration, for example, the contact member 4 on the right side of the electrode 2
When one of the two nuts 43a and 43a is twisted so that the two nuts separate from each other,
A tension force acts between the surface 21a of the electrode 2 and the inner wall surface 1b of the tank 1, and the right side of the electrode 2 is pushed up, causing the electrode 2 to
is tilted to the left, and by similarly operating the contact member 4 on the left side of the electrode 2, the electrode 2 is tilted to the right. Here, even if the electrode 2 is tilted leftward or rightward, the metal blocks 41a and 41b are
Since they do not shift on a and 1b, and conductive cushioning materials 44a and 44b are sandwiched between them, there is no possibility that the electrical connection between the wall of tank 1 and electrode 2 will be defective. It won't happen. In addition, since the contact members 4 are provided at a predetermined pitch along the longitudinal direction of the electrode 2, any position in the longitudinal direction of the electrode 2 can be tilted leftward or rightward. The tip can be precisely adjusted over the entire area.

Although the configuration of one electrode 2 has been described above, it goes without saying that the other electrodes have similar configurations.

<Effects of the Invention> As explained above, according to the present invention, electrical contact is made between the internal wall surface of the tank and both longitudinal side surfaces of each electrode, and both surfaces are electrically contacted. Contact members made of conductive material whose lengths can be adjusted with screws are arranged at predetermined intervals along the particle acceleration direction, and each contact member establishes an electrical connection between the wall of the tank and each electrode. Since the structure is configured to adjust the position of the tip of the electrode while maintaining contact, the force exerted by the screw of the contact member can be applied along the direction in which the position adjustment is desired.
The range in which the position can be adjusted is widened, and electrical contact between the wall of the tank and each electrode is ensured. Furthermore, there is no mechanical distortion in the contact member, which is advantageous in terms of stability.

Furthermore, there is a large degree of freedom in the shape and dimensions of the contact member.
Its design is easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part of an embodiment of the present invention, FIG. 2 is a detailed view of part A thereof, and FIG. 3 is a front view of the entire embodiment of the present invention. FIG. 4 is a perspective view showing a general structural example of a high frequency quadrupole linear accelerator. 1...Tank 1b...Inner wall surface 1c of tank 1...Protrusion 2...Electrode 21a...Notch surface 3 of electrode 2...Electrode support member 4...Contact member 41a, 41b... Metal block 42... Threaded portions 43a, 43b = Nuts 44a, 44b... Conductive contact material

Claims (1)

[Claims] In a high frequency multipole linear accelerator comprising a tank and a plurality of electrodes extending in a direction to accelerate particles and supported at predetermined positions within the tank by a plurality of support members provided on the wall of the tank. , electrically contacting the inner wall surface of the tank and both longitudinal side surfaces of each of the electrodes, and
Contact members made of a conductive material whose lengths can be adjusted by screws are arranged at predetermined intervals along the particle acceleration direction, and each contact member establishes the electrical contact by adjusting the screws. A high-frequency multipole linear accelerator characterized in that the high-frequency multipole linear accelerator is configured to be able to apply a predetermined force between the wall of the tank and each of the electrodes while maintaining the same.