JP2007242468A - Cooling structure of beam dump device, and building for beam dump device installation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure of a beam dump device capable of efficiently cool a dumping target with a simple constitution. <P>SOLUTION: Main beam rods 11a, 11a of a floor 11 and a wall 12 of a building 10 at which beam dump devices 30 are installed and the main beam rods 12a are respectively joined to each other by joining steel wires 11b, 12b, furthermore cooling fins 13 are embedded into concrete of the floor 11, and the other end sides of coupling reinforcing bars 11j, 13j of which one end protrudes in the building 10 from the floor 11 are mounted on the main reinforcing bar 11a and the cooling fins 13 by welding or the like. These reinforcing bars 11j, 13j, and a cooling member 32 obtained by laminating pure iron plates 32P to support a dumping target 31 are coupled with flexible members 31 so that heat generated at the dumping target 31 by collision of charged particles has been dissipated. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 is used for colliding with a target to cause collapse (see, for example, Patent Document 1). By the way, at the time of collision between the 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 amount of energy 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 the radioactive substance is generated, there is a problem that the 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 is a beam dump comprising a dump target irradiated with a charged particle beam and a heat release support member such as a cooling member in which pure iron plates supporting the dump target are laminated. A cooling structure of the apparatus, wherein the heat release support member and a reinforcing bar in the concrete of the building where the beam dump device is installed are connected by a connection member made of a material having high thermal conductivity such as metal or alloy. It is characterized by comprising.
According to a second aspect of the present invention, in the beam dump device cooling structure according to the first aspect of the present invention, the reinforcing bars are joined in advance by a joining member made of a material having high thermal conductivity.
According to a third aspect of the present invention, there is provided a beam dump comprising a dump target irradiated with a charged particle beam and a heat release support member such as a cooling member in which pure iron plates supporting the dump target are laminated. A cooling structure of the apparatus, comprising a cooling fin previously embedded in the concrete of the building where the beam dump device is installed, and a material having high thermal conductivity that connects the cooling fin and the heat release support member. And a connecting member.
According to a fourth aspect of the present invention, in the beam dump device cooling structure according to the first to third aspects, a waterproof treatment is performed between the connecting member and the concrete.

According to a fifth aspect of the present invention, there is provided a beam dump comprising: a dump target irradiated with a charged particle beam; and a heat release support member such as a cooling member in which pure iron plates supporting the dump target are laminated. A building for installing the device, one end of which is connected to a reinforcing bar in the concrete of the building, and the other end is embedded in the concrete with a connecting member made of a highly heat conductive material protruding into the building. It is characterized by being.
The invention according to claim 6 is a building for installing the beam dump device, wherein the cooling fins and one end are connected to the cooling fins and the other end protrudes into the building. And a connecting member made of a high material is embedded in the concrete.

According to the present invention, a heat release support member that supports a dump target irradiated with a charged particle beam and a reinforcing bar in the concrete of a building in which the beam dump device is installed have a high thermal conductivity such as a metal or an alloy. Dump target heat is generated by collision with a beam of high-speed charged particles, connected by a connecting member made of material, and conducted from the heat-dissipating support member to the rebar in the building concrete via the connecting member. As a result, the dump target can be efficiently cooled with a simple configuration, and the air conditioning temperature can be set higher, so that the running cost can be reduced. At this time, if the reinforcing bars are previously joined with a joining member made of a material having high thermal conductivity, heat can be released more easily and the dump target can be cooled more efficiently.
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 said connection member protrudes in a building, if water treatment is performed between the said connection member and the said concrete and water is prevented from entering through the said concrete, Contamination can be reliably 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 main reinforcement 11a and the main reinforcement 12a of the floor 11 and the wall 12 of the building 10 in which the beam dump device 30 is installed 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 in which pure iron plates 32P supporting the dump target 31 are stacked 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 same structure as that of the floor 11 may be used, and the heat may be conducted to the main bars 14a of the ceiling 14 to dissipate heat. 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.

  As described above, according to the present invention, the dump target can be efficiently cooled with a simple configuration, so that 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)

  A cooling structure for a beam dump device, comprising: a dump target irradiated with a charged particle beam; and a heat release support member such as a cooling member in which a pure iron plate supporting the dump target is laminated. The beam dump device is cooled by connecting the support member for use with the reinforcing bar in the concrete of the building where the beam dump device is installed with a connecting member made of a material having high thermal conductivity such as metal or alloy. Construction.   2. The cooling structure for a beam dump device according to claim 1, wherein the reinforcing bars are previously joined with a joining member made of a material having high thermal conductivity.   A beam dump device cooling structure comprising: a dump target irradiated with a charged particle beam; and a heat release support member such as a cooling member in which a pure iron plate supporting the dump target is laminated. A cooling fin embedded in the concrete of a building where the apparatus is installed, and a connecting member made of a material having high thermal conductivity for connecting the cooling fin and the heat release support member. Cooling structure of the beam dump device.   The cooling structure for the beam dump device according to claim 1, wherein waterproofing is performed between the connecting member and the concrete.   A building for installing a beam dump device including a dump target irradiated with a charged particle beam and a heat release support member such as a cooling member in which a pure iron plate supporting the dump target is laminated, For installing a beam dump device, characterized in that one end is connected to a reinforcing bar in the concrete of the building and the other end is embedded in the concrete with a connecting member made of a material with high thermal conductivity protruding into the building. Building. A building for installing a beam dump device including a dump target irradiated with a charged particle beam and a heat release support member such as a cooling member in which a pure iron plate supporting the dump target is laminated, A beam dump characterized in that a cooling fin and a connecting member made of a material having high thermal conductivity and having one end connected to the cooling fin and the other end protruding into the building are embedded in the concrete. Building for equipment installation.

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