CN115119378A

CN115119378A - Leakage field shielding device for guide plate type cutting magnet

Info

Publication number: CN115119378A
Application number: CN202210743124.3A
Authority: CN
Inventors: 魏艳群; 张京京; 胡强; 韩晓科; 姚庆高; 马力祯
Original assignee: Institute of Modern Physics of CAS
Current assignee: Institute of Modern Physics of CAS
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-09-27

Abstract

The invention relates to a leakage field shielding device for a deflector type cutting magnet. The cutting magnet includes an iron core and a coil. The cross section of the iron core is a C-shaped structure, and the coil is a saddle-shaped structure, which is wound in an up-down symmetrical manner. Made between the air gaps of the iron core, the outermost layer of the coil is the coil part of the cutting plate; the first shielding device, the first shielding device is a plate-like structure, and the first shielding device is stacked along the side wall of the cutting magnet and arranged on it. one side, and is arranged adjacent to the coil part of the cutting plate in the coil; the second shielding device, two second shielding devices are respectively arranged at both ends of the cutting magnet; the second shielding device includes: an upper shielding plate, a lower shielding plate and a The end side shielding plate, one end of the upper shielding plate is connected to the first shielding device; one end of the lower shielding plate is connected to the first shielding device; The upper shielding plate is connected, and the lower end thereof is connected with the lower shielding plate.

Description

Leakage field shielding device for guide plate type cutting magnet

Technical Field

The invention relates to the technical field of cutting magnet magnetic field shielding devices, in particular to a leakage field shielding device for a guide plate type cutting magnet.

Background

The cutting magnet is used as one of key parts for injection and extraction of the synchrotron, and not only can generate strong magnetic field deflection beam current, but also can not influence circulating beam current passing by a side shoulder. At present, with the rapid development of large scientific engineering devices, the theory and application research of magnets are developing towards the directions of strong magnetic fields and high current carrying, and the development of the magnets as magnetic elements for injecting and extracting beams is very important.

In the design of the cutting magnet, the size of the leakage field is one of the core technical indexes. The deflector-type cutting magnet, as a type of cutting magnet widely used therein, can be operated either in direct current or in pulse. In the actual operation process, because the exciting current flows through the coil of the cutting plate, the exciting coil bears large electromagnetic force, and meanwhile, under the limitation of the size of the cutting plate, the leakage field is found to influence the circulating beam current which is very close to the outer side of the cutting plate, so that the leakage field of the cutting magnet needs to be reduced to a very low level by a special method.

Based on the above problems, the most common current leakage field shielding methods mainly include:

and an auxiliary coil is added on the magnetic yoke, and the magnetic field generated by the auxiliary coil is utilized to reversely support the leakage field outside the cutting plate, so that the leakage field outside the cutting plate is reduced. This method can reduce the leakage field to a very low level, but the addition of the auxiliary coil complicates the structure of the cutting magnet and the operation thereof.

By using the eddy current effect, the copper plate is arranged on the outer side of the cutting plate coil, the eddy current is induced on the copper plate by the rapidly-changing magnetic field, and the magnetic field generated by the eddy current is offset with the leakage field on the outer side of the cutting plate, so that the leakage field is reduced. However, this method is only suitable for pulsed operation of the cutting magnet and is a high-frequency pulsed field.

The magnetic material is used for shielding, and the shielding plate is additionally arranged on the outer side of the coil of the cutting plate according to the actual installation space position of the cutting magnet, but the shielding effect is not ideal. Through analysis, the leakage fields of the cutting magnet are mainly concentrated at the positions corresponding to the coils at the two end parts of the iron core, and the structure also proposes that the end field clamps are arranged at the end parts to inhibit the leakage fields, but the end field clamps are opened at the positions of the coils at the two end parts and close to the circulating beam current, so that the shielding effect on the end leakage fields is not optimal.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a leakage field shielding device for a deflector-type cutting magnet, which can shield a leakage field in a circulating beam pipe area, and greatly reduce disturbance of the leakage field to a beam current in the circulating beam pipe while ensuring that a main field is satisfied in a limited space.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a leakage field shielding device for a guide plate type cutting magnet, which comprises: the cutting magnet comprises an iron core and a coil, the section of the iron core is of a C-shaped structure, the coil is of a saddle-shaped structure and is wound between air gaps of the iron core in an up-and-down symmetrical mode, and the outermost layer of the coil is a cutting plate coil part; the first shielding device is of a plate-shaped structure, is arranged on one side of the cutting magnet in a laminating way along the side wall of the cutting magnet and is arranged adjacent to the coil part of the cutting plate in the coil; the two second shielding devices are respectively arranged at two ends of the cutting magnet; the second shielding apparatus includes: an upper shield plate, a lower shield plate, and an end-side shield plate, one end of the upper shield plate being connected to the first shield device; one end of the lower shielding plate is connected with the first shielding device; the end side shield plate is respectively arranged perpendicular to the upper shield plate and the lower shield plate, the upper end of the end side shield plate is connected with the upper shield plate, and the lower end of the end side shield plate is connected with the lower shield plate.

The leakage field shielding device is preferably provided with a through hole penetrating through the two second shielding devices and the cutting magnet, and the through hole is used for enabling the beam pipeline to penetrate through.

The leakage field shielding device preferably comprises a plurality of epoxy plates, a plurality of silicon steel sheets and a layer of pressing plate, wherein the epoxy plates and the silicon steel sheets are alternately stacked and then fastened through the pressing plate.

The leakage field shielding device is preferably an epoxy plate close to the cutting magnet.

In the field leakage shielding device, preferably, the silicon steel sheets of the first shielding device have five layers; the silicon steel sheets of the upper shield plate, the lower shield plate and the end side shield plate are ten layers.

The leakage field shielding device preferably has an epoxy plate thickness of 0.5mm and a silicon steel sheet thickness of 0.5 mm.

The leakage field shielding device is preferably arranged such that the height of the first shielding device is the same as the height of the cutting magnet, and both ends of the first shielding device in the length direction extend out of both ends of the cutting magnet.

Due to the adoption of the technical scheme, the invention has the following advantages:

the invention realizes the leakage field shielding device which has simple structure and can be quickly installed and disassembled and can be used on the guide plate type cutting magnet, and overcomes the defects of complicated structure, low applicability and the like caused by reducing the leakage field through passive shielding or eddy current effect in the existing shielding means.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the first shielding apparatus of the present invention;

fig. 3 is a schematic structural view of a second shielding apparatus of the present invention.

The reference symbols in the drawings denote the following:

1-cutting a magnet; 2-a first shielding means; 3-a second shielding means; 301-upper shield plate; 302-lower shield plate; 303-end side shield plate; 4-through holes.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The invention provides a leakage field shielding device for a guide plate type cutting magnet, which utilizes magnetic materials as shielding plates, second shielding devices are added at two end parts of an iron core to shield end leakage magnetic fields, and a first shielding device (also called as a cutting plate shielding plate) is arranged at the position of a cutting plate to reduce the influence of a fringe field on a circulating beam pipeline area; through the combination of the first shielding device and the second shielding device after the structural size of the first shielding device and the second shielding device is optimized, the shielding device for reducing the leakage field in the limited cutting board range and the limited installation space is realized.

As shown in fig. 1 and 2, the present invention provides a leakage field shielding apparatus for a baffle-type cutting magnet, comprising: the cutting magnet 1 comprises an iron core and a coil, the section of the iron core is of a C-shaped structure, the coil is of a saddle-shaped structure and is wound between air gaps of the iron core in an up-and-down symmetrical mode, and the outermost layer of the coil is a cutting plate coil part; the first shielding device 2 is of a plate-shaped structure, the first shielding device 2 is arranged on one side of the cutting magnet 1 in a laminating mode along the side wall of the cutting magnet, and the first shielding device 2 is arranged adjacent to the coil part of the cutting plate in the coil; and the two second shielding devices 3 are respectively arranged at two ends of the cutting magnet 1.

Wherein, as shown in fig. 3, the second shielding device 3 comprises: an upper shield plate 301, a lower shield plate 302, and an end-side shield plate 303, one end of the upper shield plate 301 being connected to the first shield device 2; one end of the lower shield plate 302 is connected to the first shield device 2; the end-side shield plate 303 is provided perpendicularly to the upper shield plate 301 and the lower shield plate 302, respectively, and has an upper end connected to the upper shield plate 301 and a lower end connected to the lower shield plate 302.

In the above embodiment, preferably, through holes 4 for passing the beam conduit are provided through the two second shields 3 and the cutting magnet 1.

In the above embodiment, preferably, the first shielding device 2, the upper shielding plate 301, the lower shielding plate 302, and the end-side shielding plate 303 each include a plurality of epoxy plates, a plurality of silicon steel sheets, and a pressing plate, and the plurality of epoxy plates and the plurality of silicon steel sheets are alternately stacked and then fastened by the pressing plate. Specifically, a plurality of layers of epoxy plates and a plurality of layers of silicon steel sheets are alternately bonded together, and then the pressing plate is fixed with the cutting magnet through bolts after being pressed tightly.

Wherein, the part close to the cutting magnet 1 is an epoxy plate.

In the above embodiment, preferably, the silicon steel sheets of the first shielding device 2 have five layers; the silicon steel sheets of the upper shield plate 301, the lower shield plate 302, and the end side shield plate 303 are ten layers.

In the above embodiment, preferably, the thickness of the epoxy plate is 0.5mm, and the thickness of the silicon steel sheet is 0.5 mm.

In the above embodiment, it is preferable that the first shielding means 2 has the same height as the cutting magnet 1, and both ends in the longitudinal direction thereof protrude from both ends of the cutting magnet 1.

The installation mode of the present invention is as follows: the first shielding device 2 is installed along the outer arc surface of the cutting plate coil of the cutting magnet, and the first shielding device is fixed with the cutting magnet by using screws. The second shielding devices 3 are installed at two end parts of the cutting magnet, the upper shielding plate 301 and the lower shielding plate 302 are respectively flush with the cutting magnet in the height direction, and are closed with the first shielding devices along the direction of injected or extracted beam current and the side close to the circulating beam current. In addition, holes are formed in the both end side shielding plates 303 so as not to interfere with the pipes depending on the position and size of the pipes to be actually injected or extracted. The end-side shield plate 303 is connected to the cutting magnet by a screw, and the end-side shield plate is secured during operation of the cutting magnet.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A leakage field shielding device for a deflector type cutting magnet, characterized in that, comprising:

The cutting magnet includes an iron core and a coil. The cross section of the iron core is a C-shaped structure. for the coil part of the cutting board;

a first shielding device, the first shielding device is a plate-like structure, the first shielding device is stacked on one side of the sidewall of the cutting magnet, and is disposed adjacent to the coil portion of the cutting plate in the coil;

a second shielding device, two of the second shielding devices are respectively disposed at both ends of the cutting magnet;

The second shielding device includes: an upper shielding plate, a lower shielding plate and an end side shielding plate, one end of the upper shielding plate is connected to the first shielding device; one end of the lower shielding plate is connected to the first shielding plate The shielding device is connected; the end side shielding plates are respectively arranged vertically with the upper shielding plate and the lower shielding plate, the upper end of the shielding plate is connected with the upper shielding plate, and the lower end is connected with the lower shielding plate.

2 . The leakage field shielding device according to claim 1 , wherein a through hole is provided through two of the second shielding device and the cutting magnet, and the through hole is used for passing the beam pipe through. 3 .

3 . The leakage field shielding device according to claim 1 , wherein the first shielding device, the upper shielding plate, the lower shielding plate and the end side shielding plate all comprise several layers of epoxy. 4 . A board, several layers of silicon steel sheets and a laminate, several layers of epoxy boards and several layers of silicon steel sheets are alternately stacked and then tightened by pressing plates.

4 . The leakage field shielding device according to claim 3 , wherein the cutting magnet adjacent to the cutting magnet is an epoxy board. 5 .

5. The leakage field shielding device according to claim 4, wherein the silicon steel sheet of the first shielding device is five layers;

The silicon steel sheets of the upper shielding plate, the lower shielding plate and the end side shielding plate are ten layers.

6 . The leakage field shielding device according to claim 3 , wherein the epoxy plate has a thickness of 0.5 mm, and the silicon steel sheet has a thickness of 0.5 mm. 7 .

7 . The leakage field shielding device according to claim 1 , wherein the height of the first shielding device is the same as the height of the cutting magnet, and both ends of the first shielding device in the longitudinal direction protrude from both ends of the cutting magnet. 8 .