CN114580217A - Limiter for quasi-ring symmetric star simulator and design method thereof - Google Patents

Limiter for quasi-ring symmetric star simulator and design method thereof Download PDF

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CN114580217A
CN114580217A CN202210488904.8A CN202210488904A CN114580217A CN 114580217 A CN114580217 A CN 114580217A CN 202210488904 A CN202210488904 A CN 202210488904A CN 114580217 A CN114580217 A CN 114580217A
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limiter
heat sink
quasi
closed magnetic
tile
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CN114580217B (en
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许宇鸿
张欣
王先驱
刘海峰
黄捷
刘海
程钧
熊国臻
罗杨
李恒
苏祥
崔子麟
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Southwest Jiaotong University
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21B—FUSION REACTORS
    • G21B1/00—Thermonuclear fusion reactors
    • G21B1/05—Thermonuclear fusion reactors with magnetic or electric plasma confinement
    • G21B1/055—Stellarators
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21B—FUSION REACTORS
    • G21B1/00—Thermonuclear fusion reactors
    • G21B1/11—Details
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention relates to the technical field of magnetic confinement nuclear fusion equipment, in particular to a limiter for a quasi-toroidal symmetric star simulator and a design method thereof, wherein the limiter comprises a support structure, a heat sink and a tile, the heat sink is in a strip shape, the cross section of the tile is in a semi-surrounding structure and is coated and clamped on the heat sink, the limiter is a special limiter structure designed aiming at the quasi-toroidal symmetric star simulator, the limiter structure can be matched with a vacuum chamber with a three-dimensional curved surface structure and the outermost closed magnetic surface of the star simulator, in the operation process of a fusion reactor, a high-temperature plasma is isolated from a first wall of the vacuum chamber by the limiter, the first wall is protected from being damaged by heat flow, electromagnetic radiation and the like from the plasma, and the magnetic surface is protected from being damaged, the design and manufacture of the limiter can help to build a first quasi-toroidal symmetric magnetic confinement star simulator device in the world, and provide an experimental platform for the scientific research of the domestic three-dimensional plasma physics and related subjects, has important significance for the development and research of magnetic confinement nuclear fusion.

Description

Limiter for quasi-ring symmetric star simulator and design method thereof
Technical Field
The invention relates to the technical field of magnetic confinement nuclear fusion equipment, in particular to a device for a star simulator, and particularly relates to a limiter for a quasi-ring symmetric star simulator and a design method thereof.
Background
Along with the development and progress of society, the demand of human beings on energy is larger and larger, and the world energy crisis is aggravated increasingly. In the existing energy system, the traditional non-renewable energy sources such as coal, petroleum, natural gas and the like are mainly used, and not only can the energy sources generate huge pollution to the environment in the use process, but also the available life span is very limited. Therefore, in order to maintain the high rate of sustainable development of the human society, it is necessary to develop safe and abundant clean energy. The controlled nuclear fusion energy is just one kind of energy, and is known as the best way to solve the human energy crisis because of the abundant fuel reserves in sea water and no long-period radioactive substances produced in the fusion reaction process.
The occurrence of nuclear fusion reactions requires high temperatures in the billions of degrees, which ionizes matter to form a high temperature plasma. Research shows that charged particles in high-temperature plasma can be well confined in a magnetic container by adopting a strong magnetic field, which is the basic principle of magnetic confinement. Research results over the years show that controlled magnetic confinement fusion is the most probable way to realize commercialization of the fusion energy first. Currently, the two most successful controlled magnetic confinement fusion devices in the world are tokamaks and star emulators.
For tokamak, magnetic confinement fusion research based on tokamak configuration has made tremendous progress, although through a continuous search for more than half a century; however, tokamak plasma currents when approaching extreme conditions may cause large breaks in the plasma due to magnetofluid instability, leading to safety risks for the device.
The magnetic field of the stellarator which is another device of the magnetic confinement fusion is completely generated by the current of the external magnetic field coil. The star simulator does not cause large breakage because of no plasma current, and can stably operate for a long time, so that the star simulator is more suitable for serving as a commercial fusion reactor. The countries such as the United states, Japan and Germany all have the star simulator device, and the international research on the star simulator is not interrupted. The star simulator can generate a spiral magnetic field for restraining high-temperature plasma without plasma current through an external twisted magnetic field coil. However, the coil structure and manufacturing process of the stellarator is much more complex than tokamak. Compared with tokamak, the traditional stellarators built earlier have very high magnetic field waviness. In principle, the large new classical transport loss is caused, so that the confinement performance of the magnetic confinement fusion simulator is lower than that of tokamak, which is the main reason that the traditional stellatellite device cannot become the magnetic confinement fusion configuration of the international mainstream. In view of the obvious advantage of the stellarator configuration without plasma large break, there has been a continuous research on stellarators, wherein improving and optimizing the magnetic field configuration of the conventional stellarators to improve the confinement performance of the conventional stellarators to plasma has become one of the focuses of magnetic confinement fusion research in recent years.
By understanding and analyzing the characteristics of the magnetic confinement fusion devices currently available in the world, the applicant has designed a quasi-toroidal symmetric magnetic field configuration simulator which combines the advantages of tokamak and the traditional star simulator, and the quasi-toroidal symmetric star simulator comprises a coil system, a vacuum system, a support system, a power supply system, a water cooling system, a central control system and a heating and diagnosis system, wherein the main structure of the quasi-toroidal symmetric star simulator is shown in fig. 5, and a limiter is one of the important components of the vacuum system, and has the function that during the operation of the fusion reactor, the limiter isolates high-temperature plasma from the first wall of a vacuum chamber and protects the first wall from heat flow, electromagnetic radiation and the like from the plasma.
In order to help the invention manufacture a quasi-ring symmetric star simulator with excellent plasma confinement performance, the invention provides a limiter for the quasi-ring symmetric star simulator and a design method thereof.
Disclosure of Invention
The invention aims to provide a limiter for a quasi-ring symmetric star simulator and a design method thereof, wherein the limiter comprises a support structure, a heat sink and a tile, the heat sink is in a long strip shape, the cross section of the tile is in a semi-surrounding structure and is wrapped and clamped on the heat sink, the tile and the heat sink are connected through a first mounting piece, the heat sink is mounted on the support structure through a second mounting piece, and the support structure is connected with a vacuum chamber through a connecting piece; the invention relates to a special limiter structure designed aiming at a quasi-ring symmetric star simulator, which can be matched with a vacuum chamber with a three-dimensional curved surface structure and the outermost closed magnetic surface of the star simulator.
The purpose of the invention is realized by the following technical scheme:
a limiter for a quasi-ring symmetric star simulator is arranged on the inner side wall of a vacuum chamber and comprises a supporting structure, a heat sink and a tile, wherein the heat sink is in a long strip shape, the cross section of the tile is in a semi-surrounding structure and is wrapped and clamped on the heat sink, the tile and the heat sink are connected through a first mounting piece, the heat sink is arranged on the supporting structure through a second mounting piece, and the supporting structure is connected with the vacuum chamber through a connecting piece; the tile comprises a top plate and two side plates, wherein the side plates are arranged on two sides of the top plate; the top surface of the top plate is an action surface, and the action surface is matched with the outermost closed magnetic surface of the quasi-ring symmetric stellarator in shape.
Preferably, the heat sinks are arranged in a plurality, the cross sections of the heat sinks are square, and the heat sinks are connected in parallel to form a column to form a long-strip-shaped cylinder;
the tile is provided with a plurality ofly, and the cross sectional shape of a plurality of tiles all is "U" shape, and a plurality of tiles connect into one row and the cladding block is on the rectangular form cylinder that a plurality of heat sinks formed, the tile cladding is at the three lateral wall of heat sink.
More preferably, the supporting structure comprises a plurality of supporting plates, each supporting plate is provided with a connecting piece, and the plurality of heat sinks are sequentially arranged on the plurality of supporting plates in an end-to-end manner;
a plurality of third mounting holes are formed in each supporting plate, and the supporting plates are connected and fixed on the side wall of the inner cavity of the vacuum chamber through the matching of connecting pieces and the third mounting holes.
Furthermore, first mounting holes are formed in two side plates of the tile, penetrate through the side plates and extend into the side wall of the heat sink, and the tile and the heat sink are connected and fixed through the first mounting holes by using first mounting pieces;
the second mounting hole has been seted up in bearing structure's backup pad, and the second mounting hole runs through the backup pad and stretches into the diapire of heat sink, uses the second installed part to pass through the second mounting hole, is connected bearing structure and heat sink fixedly.
Preferably, the tiles are made of graphite; the first mounting piece, the second mounting piece and the connecting piece are all bolts;
the overall shape of a supporting structure formed by a plurality of supporting plates is arc-shaped and is matched with the arc-shaped inner wall of the corresponding vacuum chamber;
the action face is formed by connecting the top surfaces of a plurality of tiles end to end, and the action face is a curved surface facing to the outermost closed magnetic surface.
A design method of a limiter is used for designing the limiter and comprises the following steps:
step S100: determining the curved surface shape of the action surface of the limiter;
obtaining the coordinates of the outermost closed magnetic surface under the cylindrical coordinate system of the quasi-ring symmetric star simulator:
Figure 618617DEST_PATH_IMAGE001
in the formula:Rrepresenting the circumferential coordinate in the horizontal direction in a cylindrical coordinate system,Zrepresenting the longitudinal coordinate in the height direction in a cylindrical coordinate system, byRAndZdetermining the coordinate of the outermost closed magnetic surface under the cylindrical coordinate system;
R mn indicating correspondence of modes of magnetic surfaceRFourier component of the coordinates, Z mn Indicating correspondence of modes of magnetic surfaceZThe fourier component of the coordinates is taken,θthe polar-direction angle is shown as,φthe circumferential angle is represented as a function of,sthe radial normalized magnetic flux is expressed as,mthe polar-direction modulus is represented by,nthe number of the ring-wise modulus is represented,N p indicating the annular cycle number;
performing visualization processing on the coordinate value of the outermost closed magnetic surface to obtain the curved surface shape of the outermost closed magnetic surface;
and determining the curved surface shape of the action surface of the limiter according to the curved surface shape of the outermost closed magnetic surface, wherein the curved surface shape of the action surface of the limiter is matched or consistent with the curved surface shape of the outermost closed magnetic surface.
Step S200: determining the radius of curvature of the outermost closed magnetic surface
Figure 270047DEST_PATH_IMAGE002
In the formula: p is the radius of curvature of the film,y’is the first derivative of the curvilinear rectangular coordinate equation,y”is a square of a rectangular coordinate of a curveThe second derivative of the range; when selecting a circumferential angleφThen, the coordinates R, Z of the outermost closed magnetic surface form a two-dimensional coordinate, and the value of Z corresponds toyA value;
step S300: calculating the curvature of the outermost closed magnetic surface
Figure 470084DEST_PATH_IMAGE003
In the formula:κis a curvature.
Step S400: selecting the circumferential angleφCross section corresponding to outermost closed magnetic face equal to 0 deg., 45 deg., or 90 deg., and at polar angleθEqual to 110 DEG, 250 DEG, selecting a curvatureκThe position with the smallest value is provided with the limiter.
Further, the method also comprises the following steps:
step S500: installing the limiters at the same circumferential angleφAnd the active face of the limiter facing the plasma is tangent to the outermost closed magnetic face.
The invention has the beneficial effects that: the invention provides a limiter for a quasi-annular symmetric star simulator and a design method thereof, which are special limiter structures designed for the quasi-annular symmetric star simulator, wherein the limiter structures can be matched with a vacuum chamber with a three-dimensional curved surface structure and the outermost closed magnetic surface of the star simulator, in the operation process of a fusion reactor, a high-temperature plasma is isolated from the first wall of the vacuum chamber by the limiter, the first wall is protected from being damaged by heat flow, electromagnetic radiation and the like from the plasma, and the magnetic surface is protected from being damaged.
Drawings
FIG. 1 is a schematic structural diagram of a limiter for a quasi-annular symmetric star simulator according to the present invention;
FIG. 2 is a schematic view of the limiter according to the present invention after a portion of the supporting plate is hidden;
FIG. 3 is a schematic view of a limiter according to another embodiment of the present invention;
FIG. 4-1 is a schematic view of cross-sections corresponding to different hoop angles (0, 45, 90 deg.);
FIG. 4-2 is a simulated view of curvature κ for different hoop angles (0, 45, 90 deg.);
FIG. 5 is a schematic diagram of a quasi-annular symmetric star simulator host according to the present invention;
FIG. 6 is a diagram illustrating the use of the limiter according to the present invention;
FIG. 7 is a schematic view of the installation position of the restrainer in the vacuum system;
in the figure: 100. a support structure; 110. a support plate; 120. a second mounting hole; 130. a third mounting hole; 140. a connecting member; 200. a heat sink; 300. a tile; 310. a top plate; 320. a side plate; 330. a first mounting hole; 500. a coil system; 600. a vacuum system; 700. and (4) a supporting system.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
The applicant has devised a quasi-circularly symmetric star simulator combining the advantages of a tokamak and a conventional star simulator, and particularly as shown in fig. 5, the quasi-circularly symmetric star simulator comprises a coil system 500, a vacuum system 600 and a support system 700, wherein the vacuum system 600 comprises a vacuum chamber.
In the limiter for the quasi-ring symmetric stellarator proposed in this embodiment, as shown in fig. 1 to 3, the limiter is one of the important components of the vacuum system 600, and the limiter functions to isolate the high temperature plasma from the first wall of the vacuum chamber and protect the first wall of the vacuum chamber from heat flow and electromagnetic radiation from the plasma during the operation of the fusion reactor. The side wall of the vacuum chamber is divided into a first wall and a second wall from inside to outside, and the wall in direct contact with the plasma is the first wall of the vacuum chamber.
As shown in fig. 1 to 3, a limiter for a quasi-ring symmetric star simulator includes a support structure 100, a heat sink 200 and tiles 300, wherein the heat sink 200 has a square cross-sectional shape, and the heat sink 200 can be configured as an integral bendable strip-shaped column; the heat sink 200 may also be formed by joining multiple short sections of cuboids, and when the heat sink is formed by joining multiple short sections of cuboids into a long strip-shaped column, each short section of cuboid is a heat sink 200. In the present embodiment, a plurality of heat sinks 200 are selectively connected in parallel, that is, a plurality of heat sinks 200 are connected in parallel to form a column of long column with a square cross section.
The tile 300 has a semi-enclosed cross-section, specifically a "U" shape. Tile 300 snaps over heat sink 200 and covers the three sidewalls of heat sink 200.
Tile 300 may be shaped as a unitary flexible column having a "U" shaped cross-section; of course, as the heat sink 200 is disposed, the number of tiles 300 may be multiple, and multiple tiles 300 are wrapped on multiple heat sinks 200 in parallel. In the present embodiment, a plurality of tiles 300 are provided, that is, a plurality of tiles 300 are also connected in parallel and are wrapped and engaged with a plurality of heat sinks 200. The number of tiles 300 and heat sinks 200 may or may not be the same; the lengths of tile 300 and heat sink 200 may or may not be equal. The length of heat sink 200 is preferably greater than the length of tile 300. Heat sink 200 and tile 300 form the target plate of the limiter.
The plurality of tiles 300 are sequentially wrapped and engaged with the plurality of heat sinks 200 to form a limiter, and the whole is centipede-shaped.
Further, the heat sink 200 is mounted on the support structure 100, and when a plurality of heat sinks 200 are connected in parallel, the plurality of heat sinks 200 can be connected into a whole through the support structure 100.
The supporting structure 100 includes a plurality of supporting plates 110, and a connecting member 140 is further disposed on each supporting plate 110, and in the present embodiment, one connecting member 140 is disposed near each of four corners of each supporting plate 110. The support structure 100 is connected to the vacuum chamber of the star simulator by a connection 140.
Specifically, the tile 300 is made of graphite.
In this embodiment, the tile 300 includes a top plate 310 and two side plates 320, the side plates 320 are disposed on two sides of the top plate 310, and the top plate 310 and the two side plates 320 enclose a "U" shaped structure, and fit around three side walls of the heat sink 200.
As shown in fig. 2, two side plates 320 of tile 300 are both provided with first mounting holes 330, and first mounting holes 330 penetrate through side plates 320 and extend into the side wall of heat sink 200, so that tile 300 and heat sink 200 can be fixedly connected by using first mounting members through first mounting holes 330.
In addition, a second mounting hole 120 is formed in the support plate 110 of the support structure 100, the second mounting hole 120 penetrates through the support plate 110 and extends into the bottom wall of the heat sink 200, and the support structure 100 and the heat sink 200 can be connected and fixed through the second mounting hole 120 by using a second mounting part, as shown in fig. 2. In the present embodiment, one to four heat sinks 200 are mounted on each support plate 110, and as a preferable scheme, the head and tail ends of two adjacent support plates 110 are respectively connected to the left and right sides of the bottom wall of the same heat sink 200, and the plurality of heat sinks 200 are connected into a whole through the support plates 110.
Specifically, each support plate 110 is provided with at least one second mounting hole 120 and a plurality of third mounting holes 130, the second mounting hole 120 is located in the middle of the support plate 110, and two to four second mounting holes 120 are generally formed on a symmetrical center line of each support plate 110.
The third mounting holes 130 are disposed at both sides of the support plate 110, and the support plate 110 is fixedly coupled to the sidewall of the inner chamber of the vacuum chamber by passing the connectors 140 through the third mounting holes 130, i.e., by the connectors 140 engaging with the third mounting holes 130. Preferably, the first mounting member, the second mounting member and the connecting member 140 are all bolts.
The overall shape of the support structure 100 formed by the plurality of support plates 110 is an arc shape, and is adapted to the arc shape of the inner wall of the corresponding vacuum chamber.
As shown in fig. 1 to 2, the surface formed by the top surface of the multi-section top plate 310 is a curved surface, the curved surface is an active surface, the shape of the curved surface of the active surface matches or conforms to the shape of the outermost closed magnetic surface of the corresponding quasi-ring symmetric stellarator, and the active surface is a curved surface facing the outermost closed magnetic surface. And during the installation process of the limiter, the limiter is required to be installed on the cross section of the same circumferential angle of the outermost closed magnetic surface, the coverage range of the limiter is as large as possible, the corresponding plane curvature is as small as possible so as to facilitate the installation of the device, and the surface of the limiter facing to the plasma is tangent to the magnetic surface and used for protecting the magnetic surface.
To this end, the present embodiment also proposes a method of designing a limiter for determining a curved surface shape of an operation surface of the limiter and determining an attachment position of the limiter.
A method of designing a limiter, comprising the steps of:
step S100: determining the curved surface shape of the action surface of the limiter;
obtaining the coordinates of the outermost closed magnetic surface under the cylindrical coordinate system of the quasi-ring symmetric star simulator:
Figure 604393DEST_PATH_IMAGE004
in the formula:Rrepresenting the circumferential coordinate in the horizontal direction in a cylindrical coordinate system,Zrepresenting the longitudinal coordinate in the height direction in a cylindrical coordinate system, byRAndZdetermining the coordinates of the outermost closed magnetic surface under a cylindrical coordinate system;
R mn indicating correspondence of modes of magnetic surfaceRFourier component of the coordinates, Z mn Indicating correspondence of modes of magnetic surfaceZThe fourier component of the coordinates is taken,θthe polar-direction angle is shown as,φthe circumferential angle is represented as a function of,sthe radial normalized magnetic flux is expressed as,mthe polar-direction modulus is represented by,nthe number of the ring-wise modulus is represented,N p indicating the circumferential cycle number;
performing visualization processing on the coordinate value of the outermost closed magnetic surface to obtain the curved surface shape of the outermost closed magnetic surface;
and determining the curved surface shape of the action surface of the limiter according to the curved surface shape of the outermost closed magnetic surface, wherein the curved surface shape of the action surface of the limiter is matched or consistent with the curved surface shape of the outermost closed magnetic surface.
Step S200: determining the radius of curvature of the outermost closed magnetic surface
Figure 811252DEST_PATH_IMAGE005
In the formula: p is the radius of curvature of the film,y’is the first derivative of the curvilinear rectangular coordinate equation,y”is the second derivative of the curve rectangular coordinate equation; when selecting a circumferential angleφThen, the coordinates R, Z of the outermost closed magnetic surface form a two-dimensional coordinate, and the value of Z corresponds toyA value;
step S300: calculating the curvature of the outermost closed magnetic surface
Figure 813843DEST_PATH_IMAGE006
In the formula:κis a curvature.
Step S400: selection of circumferential angleφCross section corresponding to outermost closed magnetic face equal to 0 deg., 45 deg., or 90 deg., and at polar angleθEqual to 110 DEG, 250 DEG, selecting a curvatureκThe position with the smallest value is provided with the limiter.
Further, the method also comprises the following steps:
step S500: installing limiters at the same circumferential angleφAnd the active face of the limiter facing the plasma is tangent to the outermost closed magnetic face.
In a preferred experimental example, during the installation design simulation test, as shown in fig. 4-1 and 4-2, fig. 4-1 is a schematic diagram of cross sections corresponding to different hoop angles (0, 45, 90 deg.); fig. 4-2 is a simulated view of curvature κ for different hoop angles (0, 45, 90 deg.). Scanning different circumferential anglesφ(0, 45, 90 deg.) corresponding to a planar curvatureκFinding the circumferential angleφCross section at polar angle equal to 0 degθEqual to 110 DEG, 250 DEG, the corresponding plane, curvatureκThe value is the smallest and the range is the widest, so the limiter is installed in this position.
When the quasi-ring symmetric star simulator works, plasma is transported in the radial direction and finally reaches a target plate of the limiter along magnetic lines of force instead of directly striking on the first wall of the vacuum chamber, so that the plasma is prevented from being directly acted with the inner wall of the vacuum chamber, heat flow and particle flow are led to a graphite material capable of bearing high heat load, and the effects of isolating and protecting the first wall of the vacuum chamber are achieved.
FIG. 6 is a diagram showing a state of use of the limiter according to the present invention, in which the gray ring belt shown in FIG. 6 is a plasma generated by the star simulator after being energized, and the inner and outer peripheral surfaces of the plasma are the outermost closed magnetic surfaces; in fig. 6, the limiter is mounted tangentially to the outermost closed magnetic surface of the inner periphery on the right side of the plasma.
Fig. 7 is a schematic diagram showing an installation position of the limiter proposed by the present invention in a vacuum system, and in conjunction with fig. 6, the limiter installed tangentially to the outermost closed magnetic surface of the inner periphery of the right side of the plasma, specifically, installed on the inner wall of the vacuum chamber of the vacuum system 600, in fig. 7, a semi-transparent light gray ring-shaped cavity surrounding the outer periphery of the plasma is the vacuum chamber of the vacuum system 600, and the limiter shown in fig. 7 is specifically installed on the left wall of the ring-shaped inner cavity of the right side of the vacuum chamber; in addition, in the annular chamber on the left side of the vacuum chamber, a limiter is also mounted, but not visible in fig. 7, and is therefore not shown in fig. 7.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and is not to be construed as limited to the exclusion of other embodiments, and that various other combinations, modifications, and environments may be used and modifications may be made within the scope of the concepts described herein, either by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A limiter for a quasi-ring symmetric star simulator is arranged on the inner side wall of a vacuum chamber and is characterized by comprising a supporting structure, a heat sink and a tile, wherein the heat sink is long-strip-shaped, the cross section of the tile is of a semi-surrounding structure and is wrapped and clamped on the heat sink, the tile and the heat sink are connected through a first mounting piece, the heat sink is arranged on the supporting structure through a second mounting piece, and the supporting structure is connected with the vacuum chamber through a connecting piece; the tile comprises a top plate and two side plates, wherein the side plates are arranged on two sides of the top plate; the top surface of the top plate is an action surface, and the action surface is matched with the shape of the outermost closed magnetic surface of the quasi-ring symmetric star simulator.
2. The limiter for the quasi-annular symmetric star simulator of claim 1, wherein a plurality of heat sinks are arranged, the cross sections of the heat sinks are square, and the heat sinks are connected in a row to form an elongated column;
the tile is provided with a plurality ofly, and the cross sectional shape of a plurality of tiles all is "U" shape, and a plurality of tiles connect into one row and the cladding block is on the rectangular form cylinder that a plurality of heat sinks formed, the tile cladding is at the three lateral wall of heat sink.
3. The limiter for the quasi-annular symmetric star simulator of claim 2, wherein the supporting structure comprises a plurality of supporting plates, each supporting plate is provided with a connecting piece, and a plurality of heat sinks are sequentially arranged on the plurality of supporting plates in an end-to-end manner;
a plurality of third mounting holes are formed in each supporting plate, and the supporting plates are connected and fixed on the side wall of the inner cavity of the vacuum chamber through the matching of connecting pieces and the third mounting holes.
4. The limiter for the quasi-annular symmetric star simulator according to claim 3, wherein the two side plates of the tile are respectively provided with a first mounting hole, the first mounting holes penetrate through the side plates and extend into the side wall of the heat sink, and the tile and the heat sink are fixedly connected through the first mounting holes by using the first mounting pieces;
the second mounting hole has been seted up in bearing structure's backup pad, and the second mounting hole runs through the backup pad and stretches into the diapire of heat sink, uses the second installed part to pass through the second mounting hole, is connected bearing structure and heat sink fixedly.
5. The limiter for a quasi-annular symmetric star simulator of claim 4, wherein said tiles are made of graphite; the first mounting piece, the second mounting piece and the connecting piece are all bolts;
the overall shape of a supporting structure formed by a plurality of supporting plates is arc-shaped and is matched with the arc-shaped inner wall of the corresponding vacuum chamber;
the action face is formed by connecting the top surfaces of a plurality of tiles end to end, and the action face is a curved surface facing to the outermost closed magnetic surface.
6. A method of designing a limiter according to any one of claims 1 to 5, comprising the steps of:
step S100: determining the curved surface shape of the action surface of the limiter;
obtaining the coordinates of the outermost closed magnetic surface under the cylindrical coordinate system of the quasi-ring symmetric star simulator:
Figure 238308DEST_PATH_IMAGE001
in the formula:Rrepresenting the circumferential coordinate in the horizontal direction in a cylindrical coordinate system,Zrepresenting the longitudinal coordinate in the height direction in a cylindrical coordinate system, byRAndZdetermining the coordinates of the outermost closed magnetic surface under a cylindrical coordinate system;
R mn indicating correspondence of modes of magnetic surfaceRFourier component of the coordinates, Z mn Indicating correspondence of modes of magnetic surfaceZThe fourier component of the coordinates is used,θthe polar-direction angle is shown as,φthe circumferential angle is represented as a function of,sthe radial normalized magnetic flux is expressed as,mthe polar-direction modulus is represented by,nthe number of the ring-wise modulus is represented,N p indicating the annular cycle number;
carrying out visualization processing on the coordinate values of the outermost closed magnetic surface to obtain the curved surface shape of the outermost closed magnetic surface;
and determining the curved surface shape of the action surface of the limiter according to the curved surface shape of the outermost closed magnetic surface, wherein the curved surface shape of the action surface of the limiter is matched with the curved surface shape of the outermost closed magnetic surface.
7. The method of claim 6, further comprising the steps of:
step S200: determining the radius of curvature of the outermost closed magnetic surface
Figure 254036DEST_PATH_IMAGE002
In the formula: p is the radius of curvature of the film,y’is the first derivative of the curvilinear rectangular coordinate equation,y”is the second derivative of the curve rectangular coordinate equation; when selecting a circumferential angleφThen, the coordinates R, Z of the outermost closed magnetic surface form a two-dimensional coordinate, and the value of Z corresponds toyA value;
step S300: calculating the curvature of the outermost closed magnetic surface
Figure 361669DEST_PATH_IMAGE003
In the formula:κis a curvature.
8. The method of claim 7, further comprising the steps of:
step S400: selection of circumferential angleφCross section corresponding to outermost closed magnetic face equal to 0 deg., 45 deg., or 90 deg., and at polar angleθEqual to 110 DEG, 250 DEG, selecting a curvatureκThe position with the smallest value is provided with the limiter.
9. The method of claim 8, further comprising the steps of:
step S500: installing limiters at the same circumferential angleφAnd the active surface of the limiter facing the plasma and the outermostThe closed magnetic surfaces are tangent.
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