Charged particle accelerators and methods for charged particle accelerators.

Abstract

DEPCT65 This invention is a device for preparing a charged particle accelerator that can enable operation. Assembling the parts is simple, and there are procedures in place for the same purpose. In the vacuum pipe joint area (10), a male screw (21) is embedded into the surrounding surface. On the outside of the joint (11), a contact surface (25) is made to come into contact with the ring-shaped seal (12). Placed at the end of the inner surrounding surface (22) of the joint (11), a pressed surface (26) is prepared. To press the ring-shaped sealing part (12) onto the contact surface (25) of the joint (11A) on the ring (15), A joint surface (28) is made which is attached to the ring (15) on the nut (16) and A female screw (27) that is to be screwed into the male screw (21) of the coupling (11A) is embedded in the surrounding surface. Inside of the screw thread (16) -----------------------------------------------------------

Description

Charged Particle Accelerator and Its Construction Method

[0001] An embodiment of the present invention relates to a charged particle accelerator and a construction method thereof.

[0002] In the accelerator, an orbit of charged particles is formed by a vacuum duct in which both ends of a plurality of duct components are interconnected by joint members. Then, a plurality of devices such as deflection electromagnets, quadrupole electromagnets, and screen monitors are installed along this vacuum duct, and the orbit of charged particles moving in the internal space of this vacuum duct is controlled. And the joint member constituting the vacuum duct of the conventional accelerator was a flange body welded to both end portions of the duct component.

[0003] Japanese Patent Laid-Open No. 8-124698

[0004] Conventionally, when interconnecting duct components incorporating various devices, it was inevitable to go through the following steps. That is, it is a step of disassembling devices such as electromagnets at the factory or on-site, installing duct components with flanges, and shipping after reassembly. Or, it is a step of installing devices such as electromagnets on-site, inserting a duct component having a flange only at one end into the device, and then welding a flange body to the opposite end. For this reason, a lot of work was required when assembling the vacuum duct of the accelerator at the factory and on-site.

[0005] The present invention has been made in consideration of such circumstances, and an object thereof is to provide a charged particle accelerator and a construction method thereof that can simplify the assembly work.

[0006] Exploded view of a part of the charged particle accelerator according to the first embodiment of the present invention. Assembly view of a part of the charged particle accelerator according to the first embodiment. Enlarged cross-sectional view of part A of FIG. 2 showing the vacuum duct joint portion enlarged. (A)(B)(C) Explanatory diagram of the construction method of the charged particle accelerator according to the first embodiment. (A)(B)(C) Explanatory diagram of the construction method of the charged particle accelerator according to another example of the first embodiment. Exploded view of a part of the charged particle accelerator according to the second embodiment of the present invention. Assembly view of a part of the charged particle accelerator according to the second embodiment. (A)(B)(C) Explanatory diagram of the construction method of the charged particle accelerator according to the second embodiment.

[0007] (First Embodiment) Hereinafter, embodiments of the present invention will be described based on the attached drawings. Figure 1 is an exploded view of a part of a charged particle accelerator according to the first embodiment of the present invention. As shown, the charged particle accelerator includes a joint member 11A, an annular sealing material 12, a ring member 15, and a nut member 16 in a vacuum duct joint 10A (10), which is a part thereof, that are inserted into a duct component 17 through which charged particles pass.

[0008] The joint member 11A has a male screw 21 engraved on its outer circumference and a contact surface 25 that contacts the annular seal material 12 formed at the end of its inner circumference 22. A flange plate 18 is formed on the tip side of the joint member 11A in the first embodiment. The ring member 15 has a pressing surface 26 that presses the annular seal material 12 toward the contact surface 25 of the joint member 11A. The nut member 16 has a contact surface 28 that abuts against the ring member 15 and a female screw 27 that screws into the male screw 21 of the joint member 11A is engraved on its inner circumference.

[0009] Figure 2 is an assembly diagram of a part of a charged particle accelerator according to the first embodiment. As shown, the vacuum duct joint 10A provided at the end of the duct component 17 is butted against the flange plates 18 (Figure 1) of two opposing joint members 11A and fastened with screws or the like. A sealing material such as a gasket or O-ring (not shown) is placed on the butt surface of the flange plate 18 to ensure internal sealing. By connecting multiple duct components 17 in this way, a vacuum duct that becomes the trajectory for moving charged particles is formed.

[0010] Figure 3 is an enlarged cross-sectional view of the dashed line portion A of the vacuum duct joint 10 (Figure 2). As shown, a clearance 31 is formed between the duct component 17 and the joint member 11. A clearance 31 is also formed between the duct component 17 and the nut member 16. This clearance 31 allows for an inclination of the duct component 17 relative to the joint member 11.

[0011] The inner diameter of the joint member 11 has a dimensional margin greater than the outer diameter of the duct component 17 through which it is inserted. The contact surface 25 (Figure 1) formed at the end of the joint member 11 has an inner circumferential surface 22 that is widened to the extent that the outer circumference of the ring member 15 engages with it, and the surface to which the annular seal material 12 makes close contact is tapered. The inner diameter of the ring member 15 has a dimensional margin greater than the outer diameter of the duct component 17 through which it is inserted, and the end face to which the annular seal material 12 makes close contact is tapered. Furthermore, the end face of the ring member 15 that contacts the contact surface 28 (Figure 1) of the nut member 16 is formed as a smooth surface to the extent that it does not rotate together with the rotation of the nut member 16.

[0012] The annular sealing material 12 is an O-ring or the like that elastically deforms under pressure and adheres tightly to the contact surface to provide airtightness. When the joint member 11 is screwed into the nut member 16, the annular sealing material 12 receives pressure from the end of the joint member 11, the end face of the ring member 15, and the outer circumferential surface of the duct component 17. The elastically deformed annular sealing material 12 seals the route for outside air to enter along the outer circumferential surface of the duct component 17, maintaining the vacuum inside the duct component 17. Furthermore, even if the duct component 17 is tilted relative to the joint member 11 in the clearance 31, the elastic deformation of the annular sealing material 12 follows, so the airtightness is not impaired. For this reason, positional misalignment during installation is generally absorbed by installing bellows, but in each embodiment, it can be absorbed without such bellows.

[0013] Figures 4(A), 4(B), and 4(C) are explanatory diagrams of the construction method of the charged particle accelerator 30A according to the first embodiment. As shown in Figure 4, the charged particle accelerator 30A includes equipment 35 that interacts with charged particles passing through the duct component 17, and a support member 36 that supports the equipment 35 with respect to the floor surface (not shown). Examples of equipment 35 that interacts with the passing charged particles include deflection electromagnets, quadrupole electromagnets, and screen monitors, but are not limited to these.

[0014] The construction method for the charged particle accelerator 30A according to the first embodiment involves inserting the duct component 17 into the equipment 35, as shown in Figure 4(A). Then, as shown in Figure 4(B), the nut member 16, ring member 15, annular seal material 12, and joint member 11A are inserted in this order from the tip of the duct component 17. Furthermore, the male thread 21 (Figure 1) of the joint member 11A and the female thread 27 (Figure 1) of the nut member 16 are screwed together. This completes the assembly of the vacuum duct joint 10A, as shown in Figure 4(C).

[0015] Figures 5(A), 5(B), and 5(C) are explanatory diagrams of the construction method of a charged particle accelerator 30B according to another example of the first embodiment. In this case, duct components 17 may be inserted through multiple pieces of equipment 35. The construction method of this charged particle accelerator 30B is the same as the construction method of the charged particle accelerator 30A described above, so a detailed explanation is omitted.

[0016] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to Figures 6 to 8. In Figures 6 to 8, parts that have the same configuration or function as those in Figures 1 to 5 are indicated by the same reference numerals, and redundant explanations are omitted. Figure 6 is an exploded view of a part of the charged particle accelerator according to the second embodiment of the present invention. Figure 7 is an assembled view of a part of the charged particle accelerator according to the second embodiment.

[0017] Thus, the charged particle accelerator, in a vacuum duct joint section 10B (10) which is a part thereof, is equipped with a joint member 11B, an annular sealing material 12, a ring member 15, and a nut member 16 that are inserted into a duct component 17 through which charged particles pass.

[0018] The joint member 11B has a male screw 21 engraved on its outer circumference and a contact surface 25 that contacts the annular seal material 12 formed at the end of its inner circumference 22. In the second embodiment, the joint member 11B has contact surfaces 25 that contact the annular seal material 12 formed at both ends, and two nut members 16 are screwed onto the male screw 21 engraved on its outer circumference. The ring member 15 has a pressing surface 26 that presses the annular seal material 12 toward the contact surface 25 of the joint member 11B. The nut member 16 has a contact surface 28 that abuts against the ring member 15 and a female screw 27 that screws onto the male screw 21 of the joint member 11 has been engraved on its inner circumference.

[0019] Figures 8(A), 8(B), and 8(C) are explanatory diagrams of the construction method of the charged particle accelerator 30C according to the second embodiment. As shown in Figure 8, the charged particle accelerator 30C comprises a device 35 that interacts with charged particles passing through the duct component 17, and a support member 36 that supports the device 35 with respect to the floor surface (not shown).

[0020] The construction method for the charged particle accelerator 30C according to the second embodiment is as follows: As shown in Figure 8(A), the duct component 17 is inserted into the equipment 35. Then, as shown in Figure 8(B), the nut member 16, ring member 15, annular seal material 12, and joint member 11B are inserted in this order from the tip of the duct component 17. Two opposing duct components 17 are inserted into both ends of the joint member 11B. Furthermore, the male screw 21 (Figure 6) of the joint member 11B and the female screw 27 (Figure 6) of the nut member 16 are screwed together. This completes the assembly of the vacuum duct joint 10B as shown in Figures 7 and 8(C).

[0021] Thus, according to the construction method of the charged particle accelerator 30 as embodied in each embodiment, when inserting the duct component 17 into the equipment 35 such as an electromagnet, it is not necessary to disassemble the equipment 35 or perform flange welding work. Furthermore, at the construction site, the vacuum duct can be installed after the equipment 35 has been installed, increasing the flexibility of the construction work.

[0022] According to the charged particle accelerator of at least one embodiment described above, the assembly process can be simplified by composing the tip of the duct component with a joint member, annular sealing material, a ring member, and a nut member.

[0023] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in a variety of other forms, and various omissions, substitutions, modifications, and combinations are possible without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents.

Claims

DEPCT651. A charged particle accelerator comprising a coupling that is threaded through a delivery pipe through which the charged particles move through an annular seal that is threaded through the delivery pipe, and a nut that is threaded through the delivery pipe, with the male screw embedded in the outer surface of the coupling. The contact surface that comes into contact with the annular seal is provided at one end of the inner surface of the coupling. A pressing surface for pressing the annular seal against the contact surface of the coupling is provided on the ring. The contact surface that is attached to the ring is provided on the nut, and the female screw that is fastened to the male screw of the coupling is embedded in the inner surface of the nut.

2. A charged particle accelerator according to claim 1, with a finned coupling plate provided at the end of the coupling. 3.

4. A charged particle accelerator under any of the claims 1 through 3 where a distance between the pipe and the coupling and a distance between the pipe and the nut allows the pipe to be tilted relative to the coupling.

5. A charged particle accelerator under any of the claims 1 through 4 which also includes an apparatus arranged to allow interaction between the charged particles moving through the pipe and a support arranged to support the apparatus relative to the surface. 6.The procedure for the charged particle accelerator under claim 5 involves the insertion of the delivery pipe through the device, the insertion of the nuts, rings, annular seals and couplings from the end of the delivery pipe in the order of the nuts, rings, annular seals and couplings, and the tightening of the male screw of the coupling and the female screw of the nuts.

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