JP4615460B2 - Beam dump device cooling structure and beam dump device installation building - Google Patents

Description

  The present invention relates to a beam dump device used in, for example, an accelerator facility, and more particularly to a dump target cooling structure.

In facilities equipped with accelerators such as linacs and synchrotrons that accelerate protons and electrons to extract high-energy charged particle beams, the above particles are dumped such as carbon in order to eliminate unnecessary accelerated particles. A beam dump device for colliding with a target and causing it to collapse is used (see, for example, Patent Document 1). By the way, at the time of collision between high-speed charged particles and the dump target, generation of radioactive material and generation of heat are accompanied, so that the inside of the dump target becomes high temperature. Therefore, it is necessary to use a larger dump target as the energy amount of the beam to be absorbed is larger. Therefore, conventionally, as shown in FIG. 2, the dump target 51 is surrounded by a cooling member 52 in which pure iron plates 52P are stacked, and the inside of the building 50 in which the dump target 51 is installed is cooled by an air conditioner 53. The heat of the dump target 51 generated by the collision with the beam of high-speed charged particles irradiated from the particle introduction tube 20 is discharged into the air through the cooling member 52 so as to cool the dump target 51. I have to.
On the other hand, when the energy of charged particles is relatively small, a cooling passage is formed in a housing that supports the dump target, and cooling water is circulated through the cooling passage to cool the target (for example, , See Patent Document 2).
JP-A-7-335398 Japanese Patent Laid-Open No. 7-335397

However, in the method in which the dump target 51 is surrounded by the cooling member 52 and cooled by air, not only the apparatus is increased in size but also the air conditioning temperature needs to be considerably lowered because of less heat release. It was bulky.
In addition, the method of water-cooling the dump target is not a problem when the energy of the charged particles is relatively small, but in the dump target for high energy particles where the charged particles are used in an accelerator facility, as described above, Since radioactive materials are generated, there is a problem that cooling water is activated.

  The present invention has been made in view of the conventional problems, and an object thereof is to provide a cooling structure for a beam dump device that can efficiently cool a dump target with a simple configuration.

The invention according to claim 1 of the present application, the beam dump device including a dump target charged particle beam is irradiated, the heat dissipation support member you supporting plate the dump target formed by laminating a pure iron a cooling structure, is characterized in that a connecting reinforcing bar connecting the rebar building in concrete placing the supporting the heat releasing member and the beam dump device.
According to a second aspect of the invention, the cooling structure of the beam dump device according to claim 1, in which the reinforcing bars to each other in said concrete bound by binding steel wire.
The invention according to claim 3, and dump target charged particle beam is irradiated, the beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating a pure iron a cooling structure, comprising: a pre-embedded cooling fins in the concrete of the building to install the beam dump device, and a consolidated reinforcing bar you connect the the cooling fins and the heat-releasing support member Is.
According to a fourth aspect of the present invention, there is provided the beam dump device cooling structure according to any one of the first to third aspects, wherein the connecting reinforcing bar connecting the heat-dissipating support member and the reinforcing bar in concrete, and the above A waterproof treatment is performed between the concrete and the concrete , or between the connecting rebar for connecting the heat-dissipating support member and the cooling fin and the concrete.

The invention described in Claim 5, and dump target charged particle beam is irradiated, the beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating a pure iron there in building for installing the concrete connecting reinforcing bars of the building other end is connected to the reinforcing bar in the concrete end building is connected to the support member for the heat released to project to the inside building It is characterized by being embedded inside.
The invention described in Claim 6, and dump target charged particle beam is irradiated, the beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating a pure iron there in building for installing the cold 却Fu fin, and a connecting reinforcing bar having one end other end is connected to the cooling fins is connected to the support member for the heat released to project to the inside building Is embedded in the concrete of the building .

According to the present invention, coupled with consolidated reinforcing bar to the charged particle beam to couple the reinforcing bars in concrete of the building for installing the heat release for the support member and the bi Mudanpu device for supporting a dump target to be irradiated, high speed Since the heat of the dump target generated by the collision with the charged particle beam is conducted from the heat release support member to the reinforcing bar in the concrete of the building through the connecting reinforcing bar, it is released. Thus, not only can the dump target be cooled efficiently, but also the air conditioning temperature can be set higher, so that the running cost can be reduced. At this time, if combining reinforcing bars to each other in said concrete join steel wire, heat release becomes easier, it is possible to further efficiently cool the dump target.
Further, the same effect can be obtained by embedding cooling fins in the concrete of the building where the beam dump device is installed in advance and conducting heat from the dump target to the cooling fins.
In addition, since the connecting reinforcing bar protrudes into the building, waterproofing is performed between the connecting reinforcing bar and the concrete so as to prevent water from entering through the concrete. Water contamination can be surely prevented.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a view showing a cooling structure of a beam dump device according to the best mode of the present invention, in which 10 is a building for installing a beam dump device according to the present invention, and in this example, a floor 11 of this building 10. The main reinforcing bars 11a, 11a of the reinforced concrete constituting the wall 12 and the main reinforcing bars 12a, 12a are connected to each other by the connecting steel wires 11b, 12b, respectively. Cooling fins 13 made of a good metal are embedded. The main reinforcing bar 11a and the cooling fin 13 are attached to the other end of the connecting reinforcing bars 11j and 13j, one end of which protrudes from the floor 11 into the building 10, by welding or the like.
Reference numeral 20 denotes a particle introduction tube for introducing unnecessary charged particles accelerated by an accelerator (not shown) into the building 10, and the particle passage 20s therein is kept in a vacuum. An electromagnet 21 is disposed around the particle introduction tube 20 and restricts the trajectory of the charged particles within the particle introduction tube 20. The high energy charged particles introduced into the particle introduction tube 20 are: The electromagnet 21 moves along the particle passage 20 s and is irradiated to the beam dump device 30 from a window 22 made of a thin film such as artificial diamond provided at the end of the particle introduction tube 20. Reference numeral 23 denotes a cooling passage provided in the outer periphery of the particle introduction tube 20, and heat generated when a part of the charged particles collides with the inner wall of the particle introduction tube 20 is converted into the cooling passage 23. It is absorbed by the cooling water circulating.

The beam dump device 30 includes a dump target 31 installed on the trajectory of charged particles irradiated from the window 22 of the particle introduction tube 20, and heat that is provided around the dump target 31 and supports the dump target 31. And a cooling member 32 which is a discharge support member.
The dump target 31 is usually made of a material such as pure carbon, and the central portion thereof has a cross-sectional shape so that charged particles colliding with the dump target 31 do not leak outside the dump target 31. A recessed portion (reflecting portion) 31h having a designed shape is formed. The cooling member 32 is formed by laminating a large number of pure iron plates 32P. In this example, the cooling member 32 is provided with a plurality of connection terminals 30j, and the connection terminals 30j and the main reinforcement 11a. , 12a, and the connecting reinforcing bars 11j, 12j protruding into the building 10 and the connecting terminals 30j and the connecting reinforcing bars 13j connected to the cooling fins 13 are made of iron or copper. The flexible members 33 are connected to each other.
Here, it is desirable to waterproof between the connecting reinforcing bars 11j, 12j and the concrete of the floor 11 and the wall 12. This is to prevent the water that has entered from the concrete from entering the building 10. If there is intrusion water, the intrusion water may be activated by the radioactive material generated in the dump target 31. is there. As this waterproofing treatment, for example, the periphery of the connecting reinforcing bars 11j, 12j and the connecting reinforcing bar 13j is hardened with waterproof concrete 11k, 12k, or a prevention sheet is laid on the surface of the floor 11 and a flooring is applied thereon. A known technique such as can be used.

  By making the cooling structure of the beam dump device 30 as described above, heat generated by collision of charged particles and conducted from the dump target 31 to the cooling member 32 is connected to the connection terminal 30j, the flexible member 33, and the connection. Heat is conducted through the reinforcing bars 11j and 12j to the main reinforcing bars 11a and 12a of the reinforced concrete constituting the floor 11 and the wall 12 of the building 10, and is radiated, and via the connecting terminals 30j, the flexible member 33, and the connecting reinforcing bars 13j. Then, the heat is conducted to the cooling fins 13 embedded in the reinforced concrete and radiated. Therefore, since the heat of the dump target 31 can be efficiently radiated, the beam dump device 30 can be downsized. Moreover, since the set temperature of the air conditioning can be made higher than before, not only the problem of running cost is eliminated, but also the problem of radiation of water does not occur because no cooling water is used.

  Thus, according to this best mode, the floor 11 of the building 10 in which the beam dump device 30 is installed and the main bars 11a of the wall 12 and the main bars 12a are connected to each other by the connecting steel wires 11b and 12b, respectively. The cooling fins 13 are embedded in the concrete of the floor 11, and the other ends of the connecting reinforcing bars 11 j and 13 j whose one ends protrude from the floor 11 into the building 10 are welded to the main reinforcing bars 11 a and the cooling fins 13. The connecting reinforcing bars 11j and 13j and the cooling member 32 on which the pure iron plate 32P supporting the dump target 31 is laminated are connected to the flexible member 33, and are generated in the dump target 31 by collision of charged particles. Since the heat to be radiated is radiated, the dump target can be efficiently cooled with a simple configuration. Therefore, the apparatus can be miniaturized and the running cost can be reduced.

In the best mode, the heat generated in the dump target 31 is radiated to the main bars 11a and 12a of the floor 11 and the wall 12 and the cooling fins 13 embedded in the concrete of the floor 11, but the ceiling 14 Alternatively, the heat may be dissipated by conducting the heat to the main bar 14a of the ceiling 14 in the same configuration as the floor 11. Further, depending on the amount of heat generated by the dump target 31, the heat conducted from the dump target 31 to the cooling member 32 may be radiated using only the main reinforcement 11 a of the floor 11, the main reinforcement 12 a of the wall, or the cooling fins 13. Good.
In the above example, the beam dump device 30 used for eliminating unnecessary charged particles accelerated by the accelerator has been described. However, the present invention is a beam dump used for preliminary experiments such as intensity measurement of a charged particle beam. The present invention is also applicable to a beam dump device for other purposes such as a device.

  Thus, according to the present invention, since the dump target can be efficiently cooled with a simple configuration, it is possible to provide a small-sized beam dump device with high cooling efficiency and to reduce the running cost.

It is a figure which shows the cooling structure of the beam dump apparatus which concerns on the best form of this invention. It is a figure which shows the cooling structure of the conventional beam dump apparatus.

Explanation of symbols

10 Building for installing beam dumper, 11 floor, 11a main bar, 11b steel wire for connection, 11j connecting bar, 11k waterproof concrete, 12 walls, 12a main bar,
12b steel wire for connection, 12j rebar for connection, 12k waterproof concrete,
13 cooling fins, 13j connecting reinforcing bars, 20 particle introduction pipes, 20s particle passages,
21 Electromagnet, 22 Window, 23 Cooling passage, 30 Beam dump device,
30j connection terminal, 31 dump target, 31h recess, 32 cooling member,
32P pure iron plate, 33 flexible member.

Claims (6)

And dump target charged particle beam is irradiated, a cooling structure of a beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating the pure iron,
A cooling structure for a beam dump device, comprising a connecting reinforcing rod for connecting the heat release support member and a reinforcing bar in concrete of a building where the beam dump device is installed. Cooling structure of the beam dump device according to claim 1, characterized in that the reinforcing bars to each other in said concrete bound by binding steel wire. And dump target charged particle beam is irradiated, a cooling structure of a beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating the pure iron,
A pre-embedded cooling fins in the concrete of the building to install the beam dump device,
Cooling structure of the beam dump device is characterized in that a consolidated reinforcing bar you connect the the cooling fins and the heat-releasing support member. Between the rebar for connection between the support member for heat release and the reinforcing bar in the concrete and the concrete, or between the rebar for connection between the support member for heat release and the cooling fin and the concrete. The cooling structure for the beam dump device according to any one of claims 1 to 3, wherein a waterproofing treatment is performed on the beam dump device. There in the dump target charged particle beam is irradiated, for installing the beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating a pure iron building,
And wherein the coupling reinforcing bars having one end other end is connected to the reinforcing bar in the concrete of the building is connected to the support member for the heat released to project to the inside building is embedded in the concrete of the building A building for installing a beam dump device. There in the dump target charged particle beam is irradiated, for installing the beam dump device including a heat dissipation support member you supporting plate the dump target formed by laminating a pure iron building,
And the cold 却Fu fin, one end and a connecting reinforcing bars other end is connected to the cooling fins is connected to the support member for the heat released to project to the inside building is embedded in the concrete of the building A building for installing a beam dump device.

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