JP2003084100A - Neutron target - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel neutron target container capable of carrying out replacement work easily in a short time. SOLUTION: The target container 3 for storing a liquid target L, and double containments 4, 5 for covering a periphery of the container 3 are attached integrally to an attaching block 2 attached to a target carriage a, and a flow passage 7 is formed in the block 2 to make the liquid target L supplied from a target carriage (a) side flow to a target container 3 side. Since the container 3 and the containments 4, 5 are thereby detached at the same time by detaching only the attaching block 2, the replacement work is easily carried out in the short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a neutron target provided in a neutron scattering facility and colliding with a proton beam to generate neutrons.

[0002]

2. Description of the Related Art Neutron science research based on high-intensity proton accelerators is promising for basic science of life and materials, transmutation of long-lived nuclides, and neutron scattering is one of the means. There are facilities.

This neutron scattering facility guides a high-intensity proton beam accelerated to near the speed of light by the high-intensity proton accelerator from the accelerator to the inside of the facility, and helium provided in the facility as shown in FIG. One of the important themes of the above-mentioned neutron science research plan is to collide with the atomic nuclei of the target device T in the vessel B to generate and take out secondary particles such as neutrons and use them for various researches. It has become one.

As shown in FIGS. 4 to 6, the target device T is provided with a neutron target b at the tip of a target carriage a which is movable in the helium vessel B direction, and is supplied into the neutron target b. Mercury (H
g) and other liquid targets L are made to collide with a high-intensity proton beam to artificially generate a large amount of secondary particles such as neutrons, and the secondary particles are taken out from the neutron beam extraction line into various experimental holes to produce a substance. It is intended to be used for various studies such as investigating the structure of.

[0005]

By the way, the neutron target b is directly worn by a high-intensity proton beam and produces a large amount of secondary particles.

Therefore, although the neutron target b is usually scheduled to be replaced once to three times a year,
Since all the replacement work is performed by remote operation using a manipulator or the like, there is a disadvantage that the replacement work requires a lot of labor and time.

That is, in the replacement work of the neutron target b, first, as shown by the dotted line in FIG. 4, the target carriage a is moved to pull out the neutron target b from the helium vessel B, and then, as shown in FIG. As shown, the inner and outer double storage containers c and d forming the outer shell are removed by remote control. Next, as shown in FIG. 2B, the target container e substantially containing the liquid target is removed together with its support f, and then a new target container e, an inner storage container d, and an outer part are attached to the removed part. The replacement work of the target container b is completed by sequentially installing the double containment containers consisting of the storage container c in the reverse order of this procedure and connecting the necessary pipes and the like. Therefore, since it is necessary to remove and attach at least two containers c and d, e in this order for one replacement of the target b, a great deal of labor and time are required for the replacement work. The work is not easy.

As shown in FIGS. 5 and 6, cooling water for suppressing heat generation during operation flows between the inner and outer storage containers c and d, and the inner storage is also used. An inert gas such as helium is supplied to the space between the container d and the target container e. Further, the liquid target L in the target container e is circulated and supplied from a tank (not shown) provided on the side of the target carriage a via target pipes g, g.

Therefore, the present invention has been devised in order to effectively solve such a problem, and an object thereof is to provide a novel neutron target container which can be replaced easily and in a short time. It is provided.

[0010]

Means for Solving the Problems In order to solve the above problems, the present invention is a neutron target which is detachably attached to a target carriage and which collides a proton beam with a liquid target housed therein to generate neutrons,
A mounting block detachably attached to the target carriage, a target container for accommodating the liquid target, and a dual storage container that covers the periphery of the target container at a constant interval are integrally mounted, and A flow passage is formed in the mounting block to flow the liquid target supplied from the target carriage side to the target container side.

Therefore, by removing the mounting block from the target carriage, the target container and the double storage container mounted on the mounting block can be simultaneously removed. In addition, if a new target container and double containment vessel are installed in advance in a separately manufactured mounting block, by attaching this new mounting block to the target trolley, a new target container and double containment vessel can be simultaneously installed. Since it can be attached, the target container and the double storage container can be replaced easily and in a short time.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a neutron target 1 according to the present invention, and FIG. 2 is a partially cutaway plan view of the same.

As shown, this neutron target 1
Is a rectangular mounting block 2 which is detachably mounted so as to be mounted on the above-mentioned target carriage a, and a substantially U which is integrally mounted on the front side of the mounting block 2 so as to project horizontally therefrom. It is mainly composed of a V-shaped target container 3 and double spatula-shaped inner and outer storage containers 4 and 5 which are integrally attached to the front side of the mounting block 2 so as to surround the target container 3. Has been done.

The mounting block 2 is detachably mounted on the mounting base h on the side of the target carriage a by a plurality of long bolts 6, 6 ... Which vertically pass through the mounting block 2. Is the opening of the liquid passages i, i formed in the mount h and the inlet / outlet 3 of the target container 3.
Flow passages 7, 7 are formed to respectively communicate between a and 3b. Therefore, the liquid target L in the tank (not shown) on the side of the target carriage a is circulated and supplied into the target container 3 through the liquid passages i and i and the flow passages 7 and 7. In the figure, g and g are target pipes connected to the liquid passages i and i in the mount h.

On the other hand, the double containment vessels 4, 5 are configured such that the respective flange portions 4a, 5a formed in the openings thereof are integrally attached to the attachment block 2 side by the attachment bolts 14, 14 ,. Further, the cooling water pipe 10 and the inert gas pipe 11 are connected to the communication holes 8 and 9 formed in the flange portions 4a and 5a, respectively. Further, the cooling water pipe 10 and the inert gas pipe 11 are provided with joint mechanisms 12 and 13, respectively. At the positions of the joint mechanisms 12 and 13, the neutron target 1 side and the truck a side are separated from each other. Has become.

Therefore, in the neutron target 1 of the present invention having such a structure, the mounting block 2 is used as a base, and the target container 3 and the double inner and outer containment vessels 4, 5 are integrally mounted thereto. As shown in FIG. 3, by removing only the mounting block 2 from the target carriage a by remote control, the target container 3 and the double inner / outer storage containers 4 and 5 can be collectively removed. You can Also, this target container 3
Since the fluid passages 7 and 7 in the mounting block 2 and the liquid passages i and i in the mounting base h are connected between the liquid target pipes g and g on the carriage a side, the mounting block It becomes possible to separate them by simply removing 2, and the separation work between the target container 3 and the liquid target pipes g, g as in the conventional case is not necessary. In this separation, the joint mechanism 1 of the cooling water pipe 10 and the inert gas pipe 11 is previously prepared.
Needless to say, the work of separating from the parts 2 and 13 is also necessary.

After that, when the neutron target 1 is removed in this way, a new neutron target prepared in advance is attached to this mounting base h side, and joint mechanisms 12, 13 of the cooling water pipe 10 and the inert gas pipe 11 are attached. By connecting the target container 3 and the double inner and outer storage containers 4 and 5 at once, it is possible to connect the target container 3 and the liquid target pipes g on the carriage a side at the same time.

As described above, according to the present invention, the containers 3, 4, 5 are integrally attached to the mounting block 2 which is detachably mounted on the side of the target carriage a.
The work of attaching and detaching every 4 and 5 becomes unnecessary, and the replacement work can be achieved easily and in a short time.

[0020]

In summary, according to the present invention, since the replacement work can be performed easily and in a short time, the interruption time of the entire facility required for the replacement work can be greatly shortened.
It can contribute to efficient operation. Further, since the remote work at the time of replacement can be practically performed only by attaching and detaching the mounting block, an excellent effect such as highly reliable replacement work can be realized.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a neutron target according to the present invention.

FIG. 2 is a partially cutaway plan view showing an embodiment of a neutron target according to the present invention.

FIG. 3 is a conceptual diagram showing a state in which a neutron target according to the present invention is attached to and detached from a dolly.

FIG. 4 is a conceptual diagram showing a neutron scattering facility.

FIG. 5 is a vertical sectional view showing a structure of a conventional neutron target.

FIG. 6 is a cross-sectional view showing the structure of a conventional neutron target.

FIG. 7 is a conceptual diagram showing a state in which a conventional neutron target is attached and detached.

[Explanation of symbols]

1 Neutron target 2 Mounting block 3 target containers 4 Outer containment 5 Inner containment 6 long bolt 7 flow passage 8, 9 communication holes 10 Cooling water piping 11 Inert gas piping a target cart Liquid target piping h Mounting base i liquid passage L liquid target

Claims (4)

[Claims] 1. A neutron target which is detachably attached to a target carriage and which collides a proton beam with a liquid target housed therein to generate neutrons,
A mounting block detachably attached to the target carriage, a target container for accommodating the liquid target, and a dual storage container that covers the periphery of the target container at a constant interval are integrally mounted, and A neutron target, characterized in that a flow passage for flowing a liquid target supplied from the target carriage side to the target container side is formed in the mounting block. 2. The neutron target according to claim 1, wherein a cooling water pipe for flowing cooling water is connected between the double containment vessels. 3. The neutron target according to claim 1, further comprising an inert gas pipe for flowing an inert gas between the target container and the double inner storage container. 4. The neutron target according to claim 1, wherein the liquid target is mercury.