Dual-v shaped closed divertor compatible with multiple elongation ratios

Abstract

The application relates to the technical field of fusion reactors and discloses a double-V-shaped closed divertor compatible with multiple elongation ratios, which comprises an inner divertor used for reflecting plasma, sending recycled particles and impurity particles formed by reflection into an outer divertor, a first outer divertor comprising a first particle reflection baffle and a second particle reflection baffle, the first particle reflection baffle and the second particle reflection baffle forming a V-shaped closed structure, and the first particle reflection baffle and the second particle reflection baffle both being used for reflecting the recycled particles and the impurity particles to a strike point direction. The application can effectively close the recycled particles and the impurity particles near a strike point of a divertor target plate, so that a large amount of recycled neutral particles and impurity particles reflected to the strike point are instantaneously ionized, thereby rapidly radiating energy, greatly reducing heat flow deposited to the V-shaped closed divertor, and effectively solving the high heat load problem of an HL-3 device.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fusion reactors, and particularly provides a double-V-shaped closed divertor compatible with multiple elongation ratios. BACKGROUND

[0002] Controllable magnetic confinement nuclear fusion is expected to solve future energy problems. A tokamak is a way to achieve controllable magnetic confinement nuclear fusion, and a divertor is one of important components of the tokamak device, which shoulders the functions of heat and dust removal. A large amount of heat flows out from a plasma region of the tokamak, and then part of the heat flow is transported to a divertor target plate through open magnetic field lines at the boundary. For a future compact fusion reactor (such as SPARC), parallel heat flow flowing into the divertor entrance region will exceed 1 GW / m2. If the heat flow of the GW / m2 order is directly deposited on the divertor target plate, the divertor target plate material will be instantaneously melted. Therefore, the heat flow must be radiated before reaching the divertor target plate, so as to reduce the heat load of the divertor target plate.

[0003] Divertor de-targeting is an effective way to reduce the heat load deposited on the divertor target plate, and also reduces the electron temperature of the divertor target plate and improves the neutral particle pressure in the divertor target plate region. Therefore, the divertor de-targeting can not only effectively solve the problem of high heat load of the divertor, but also improve the helium ash removal capacity and particle control capacity of the divertor. How to improve the divertor de-targeting capacity to solve the problems of high heat load and helium ash removal of the divertor is a very important research topic in the field of magnetic confinement nuclear fusion. At present, the ways to achieve divertor de-targeting mainly include the following: 1. An advanced divertor (such as a snowflake divertor, a long-leg closed divertor, a Super-X divertor and other advanced divertors) is designed to improve the divertor de-targeting capacity and helium ash removal capacity, so as to reduce the heat flow deposited on the divertor target plate; 2. Other auxiliary means (such as injection of an external source radiation impurity gas (which can be nitrogen, neon, argon and the like) near the strike point of the divertor) are used to reduce the heat load of the divertor and achieve radiation of the divertor; 3. The magnetic topology structure is changed (such as using resonant magnetic perturbation and installing a bias in the divertor region) to reduce the heat flow per unit area on the divertor target plate and scan the strike point position; and 4. The above multiple ways are combined to improve the divertor de-targeting capacity and solve the problem of high heat load of the divertor.

[0004] China's HL-3 adopts advanced structure and control mode, and the plasma volume is more than twice the size of the largest existing device in China, the plasma current can reach more than 2.5 million amperes, and the plasma ion temperature can reach more than 150 million degrees, with the scale and operation capacity of the core level. The HL-3 device has realized 1MA high-confinement divertor discharge mode in 2023. The HL-3 device adopts an open structure, and its main purpose is to flexibly realize multiple advanced divertor configurations, realize advanced divertor, and improve the control ability of the advanced divertor configuration. And it has realized advanced divertors such as snowflake minus, snowflake plus, and three-pronged snowflake divertor in experiments. However, the HL-3 device has the operation of core-level plasma parameters, and the fusion triple product (the product of electron density, electron temperature, and energy confinement time) reaches 10 20 . Therefore, the HL-3 device needs to further improve the heating power and plasma current. High heating power and larger plasma current will reduce the heat flow width of the scrape-off layer, which will inevitably increase the heat load deposited on the divertor target plate; therefore, under the high-parameter operation state of the HL-3, the divertor target plate will face a serious high-heat load problem. In addition, the HL-3 currently only installs the lower divertor, and the upper divertor has not been physically designed and installed. It is well known that the double-null divertor not only can increase the elongation ratio and greatly improve the operation parameters of the device, but also can further reduce the heat load of the divertor target plate. Therefore, in order to solve the high heat load problem of the HL-3 high-parameter divertor, in addition to using other auxiliary means, the HL-3 device will adopt a double-null closed divertor discharge.

[0005] Therefore, the HL-3 upper divertor double-V-shaped closed divertor design patent application is proposed. SUMMARY

[0006] The purpose of the present application is to provide a double-V-shaped closed divertor compatible with multiple elongation ratios, which solves the high heat load problem of the existing HL-3 device divertor target plate.

[0007] The present application is realized by the following technical scheme:

[0008] A double-V-shaped closed divertor compatible with multiple elongation ratios, comprising: an inner divertor for reflecting plasma and sending the recirculating particles and impurity particles formed by reflection into an outer divertor; a first outer divertor comprising a first particle reflection baffle and a second particle reflection baffle; the first particle reflection baffle and the second particle reflection baffle form a V-shaped closed structure; the first particle reflection baffle and the second particle reflection baffle are both used to reflect the recirculating particles and the impurity particles to the strike point direction.

[0009] Further, the inner divertor comprises: a vertical particle reflection baffle and a first horizontal particle reflection baffle; one end of the vertical particle reflection baffle is connected to one end of the first horizontal particle reflection baffle; the vertical particle reflection baffle is perpendicular to the first horizontal particle reflection baffle; the other end of the first horizontal particle reflection baffle is connected to the first particle reflection baffle; the first horizontal particle reflection baffle and the first particle reflection baffle form a smaller DOME vault.

[0010] Further, the inner divertor further comprises: an inclined particle reflection baffle for blocking the plasma from directly bombarding the first wall of the vacuum chamber and providing a moving space for the plasma; one end of the inclined particle reflection baffle is connected to the other end of the vertical particle reflection baffle.

[0011] Further, the first particle reflection baffle comprises: a first hidden flux zone particle reflection baffle and a first neutral particle shielding layer baffle; the other end of the first horizontal particle reflection baffle is connected to one end of the first hidden flux zone particle reflection baffle, and the other end of the first hidden flux zone particle reflection baffle and one end of the first neutral particle shielding layer baffle form a first pumping port; the other end of the first neutral particle shielding layer baffle is connected to one end of the second particle reflection baffle.

[0012] Further, the double-V-shaped closed divertor further comprises: a second outer divertor comprising: a third particle reflection baffle and a fourth particle reflection baffle; the third particle reflection baffle and the fourth particle reflection baffle form a V-shaped closed structure; both the third particle reflection baffle and the fourth particle reflection baffle are used for reflecting the recycled particles and the impurity particles towards the strike point.

[0013] Further, the third particle reflection baffle comprises: a second hidden flux zone particle reflection baffle and a second neutral particle shielding layer baffle; one end of the second hidden flux zone particle reflection baffle is connected to the other end of the first neutral particle shielding layer baffle, and the other end of the second hidden flux zone particle reflection baffle and one end of the second neutral particle shielding layer baffle form a second pumping port; the other end of the second neutral particle shielding layer baffle is connected to one end of the fourth particle reflection baffle.

[0014] Further, the fourth particle reflection baffle is perpendicular to the horizontal plane.

[0015] Further, the second outer divertor further comprises: a second horizontal particle reflection baffle for blocking the plasma from directly depositing on the first wall of the vacuum chamber; one end of the second horizontal particle reflection baffle is connected to the other end of the fourth particle reflection baffle.

[0016] Further, the first outer side deflector and the second outer side deflector both have a small DOME arch.

[0017] Further, the double V-shaped closed deflector further comprises a first low temperature pump and a second low temperature pump; the first low temperature pump is close to the first gas suction port, and the first low temperature pump is in communication with the first gas suction port; the second low temperature pump is close to the second gas suction port, and the second low temperature pump is in communication with the second gas suction port.

[0018] Compared with the prior art, the present application has the following advantages and beneficial effects: the double V-shaped structure of the outer side deflector reflects the recirculating particles to the strike point direction at the same time, can effectively close the recirculating particles and impurity particles near the strike point of the deflector target plate, therefore, a large number of recirculating neutral particles and impurity particles reflected to the strike point will be instantaneously ionized, thereby quickly radiating energy, greatly reducing the deposition of the double V-shaped closed deflector heat flow, effectively solving the high heat load problem of the HL-3 device. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 A structure schematic diagram of a double V-shaped closed deflector compatible with multiple elongation ratios is provided for the embodiment 1 of the present application.

[0021] Figure 2 A double V-shaped closed deflector zone recirculating neutral particle density distribution schematic diagram is provided for the embodiment 2 of the present application.

[0022] Figure 3 A double V-shaped closed deflector zone electron temperature distribution schematic diagram is provided for the embodiment 2 of the present application.

[0023] The marks in the drawings and the corresponding names of the parts are as follows:

[0024] 1-first particle reflection baffle, 2-second particle reflection baffle, 3-vertical particle reflection baffle, 4-first horizontal particle reflection baffle, 5-inclined particle reflection baffle, 7-third particle reflection baffle, 8-fourth particle reflection baffle, 10-second horizontal particle reflection baffle, 71-second hidden flux zone particle reflection baffle, 72-second neutral particle shielding layer baffle, 101-first hidden flux zone particle reflection baffle, 102-first neutral particle shielding layer baffle. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example 1

[0027] This invention provides a double-V-shaped divertor suitable for tokamak, comprising an inner divertor, a first outer divertor, and a second outer divertor. Both the first and second outer divertors are V-shaped closed structures, forming a double-V-shaped closed divertor. The outer divertors of the double-V-shaped closed structure simultaneously reflect recirculated particles towards the impact point, effectively confining recirculated and impurity particles near the target point of the divertor plate. This rapid energy radiation significantly reduces the heat flux deposited in the V-shaped closed divertor, effectively solving the high heat load problem of the HL-3 device. Furthermore, the double-V-shaped closed structure allows for switching between the two V-shaped closed divertors, further enhancing the HL-3 divertor's ability to reduce heat load.

[0028] The following is in conjunction with the appendix Figure 1 The functions, structures, and working principles of the inner divertor, the first outer divertor, and the second outer divertor are explained in detail. Figure 1 In the middle, the position where the outermost closed magnetic surface intersects with the divertor target plate is called the impact point position. The main plasma region includes part of the core plasma, the scraping layer, and the divertor region plasma.

[0029] 1. Internal divertor

[0030] The inner divertor is used to reflect plasma and send the recycle particles and impurity particles formed by the reflection into the outer divertor, including: an inclined particle reflector baffle 5, a vertical particle reflector baffle 3 and a first horizontal particle reflector baffle 4.

[0031] (1) Inclined particle reflector baffle

[0032] The tilted particle reflector baffle 5 is used to prevent plasma flowing from the core from directly bombarding the first wall of the vacuum chamber, thereby damaging the first wall. Since the thermal load bearing limit of the first wall of the vacuum chamber is much smaller than that of the divertor target plate material, and the upper divertor structure is compatible with the lower single-zero divertor discharge, the tilted structure can leave more plasma space for the lower single-zero discharge.

[0033] (2) Vertical particle reflector

[0034] The vertical particle reflection baffle 3 is perpendicular to the horizontal plane, and the plasma directly strikes on the vertical particle reflection baffle 3. The recirculating particles and impurity particles formed by the reflection of the vertical particle reflection baffle 3 will be directly reflected into the outer divertor, thereby weakening the closure of the inner divertor to the recirculating particles and impurity particles and enhancing the off-target capability of the outer divertor.

[0035] (3) The first horizontal particle reflection baffle

[0036] The first horizontal particle reflection baffle 4 is perpendicular to the vertical particle reflection baffle 3 and together with the vertical particle reflection baffle 3 forms a right-angle divertor. When the plasma directly strikes on the vertical particle reflection baffle 3, the vertical particle reflection baffle 3 and the first horizontal particle reflection baffle 4 form a completely open inner divertor, which is beneficial to improve the off-target capability and the ability of helium ash removal of the outer divertor. When the plasma directly strikes on the right-angle corner formed by the vertical particle reflection baffle 3 and the first horizontal particle reflection baffle 4, the vertical particle reflection baffle 3 and the first horizontal particle reflection baffle 4 form a closed V-shaped divertor. Since the openness and the closure of the inner divertor will affect the off-target performance of the outer divertor and the ability of particle recirculation control, the operating state of the outer divertor can be changed by changing the strike point position.

[0037] The connection relationship among the inclined particle reflection baffle 5, the vertical particle reflection baffle 3 and the first horizontal particle reflection baffle 4 is as follows: one end of the inclined particle reflection baffle 5 is connected to one end of the vertical particle reflection baffle 3, the other end of the vertical particle reflection baffle 3 is connected to one end of the first horizontal particle reflection baffle 4, and the other end of the first horizontal particle reflection baffle 4 is connected to the outer divertor, and the first horizontal particle reflection baffle 4 and the outer divertor form a small DOME vault.

[0038] In summary, the inner divertor is a simple structure divertor, which is not only beneficial to engineering processing, but also can flexibly optimize the closure of the inner divertor by changing the strike point position. If the inner divertor is open, a large number of recirculating particles and impurity particles will enter the outer divertor, which promotes the off-target of the outer divertor. On the contrary, if the inner divertor is closed, part of the particles are shielded in the inner divertor, which further suppresses the deep off-target of the outer divertor.

[0039] 2、The first outer divertor

[0040] The first outer divertor is composed of a first particle reflection baffle 1 and a second particle reflection baffle 2, and the first particle reflection baffle 1 and the second particle reflection baffle 2 form a V-shaped closed structure, and the first particle reflection baffle 1 and the second particle reflection baffle 2 are both used for reflecting the recirculating particles and impurity particles to the direction of the strike point. The plasma is deposited on the V-shaped structure, so that the V-shaped closed divertor is formed instead of a single particle reflection plate. Since the heat flow flowing from the upstream to the divertor target plate is mainly concentrated near the strike point, a large number of recirculating neutral particles will be instantaneously ionized, and the energy will be quickly radiated, which can reduce the vertical heat flow deposited on the V-shaped closed divertor target plate. Due to the strong recirculating particle closure of the divertor, not only the off-target ability of the divertor is enhanced, but also the neutral particle pressure in the divertor area is increased, the HL-3 helium ash removal and recirculating particle control ability is enhanced, the recirculating particle and impurity particle backflow core is avoided, the compatibility of the divertor off-target and the core plasma is realized.

[0041] (1) The first particle reflection baffle

[0042] The first particle reflection baffle 1 is composed of a first hidden flux area particle reflection baffle 101 and a first neutral particle shielding layer baffle 102, and the first particle reflection baffle 1 and the first horizontal particle reflection baffle 4 form a DOME dome. Wherein, the other end of the first horizontal particle reflection baffle 4 is connected to one end of the first hidden flux area particle reflection baffle 101, and the other end of the first hidden flux area particle reflection baffle 101 and one end of the first neutral particle shielding layer baffle 102 form a first pumping port, and the other end of the first neutral particle shielding layer baffle 102 is connected to one end of the second particle reflection baffle 2. The first particle reflection baffle 1 reflects the particles to the direction of the strike point, which can enhance the neutral pressure in the divertor. Wherein, the width of the first pumping port can be selected as 25mm, and the first pumping port can improve the pumping capacity.

[0043] (2) The second particle reflection baffle

[0044] The second particle reflection baffle 2 is another particle reflection baffle of the first outer divertor, and the second particle reflection baffle 2 also reflects the recirculating neutral particles to the direction of the strike point. The first hidden flux area particle reflection baffle 101, the first neutral particle shielding layer baffle 102 and the second particle reflection baffle 2 jointly form the first outer divertor of the V-shaped closed structure.

[0045] In summary, the main function of the first outer divertor is to enable the HL-3 device to achieve an advanced tokamak operating mode of large triangularity and large elongation ratio, which is compatible with the large elongation ratio double null divertor configuration, not only improving the heat load control capability of the HL-3 device, but also improving the confinement performance of the core plasma, making the divertor and the core well compatible. In addition, in order to retain the pumping port, the first particle reflection baffle 1 is composed of a separate first hidden flux zone particle reflection baffle 101 and a first neutral particle shielding layer baffle 102.

[0046] 3. Second outer divertor

[0047] The second outer divertor is composed of a third particle reflection baffle 7, a fourth particle reflection baffle 8, and a second horizontal particle reflection baffle 10. The third particle reflection baffle 7 and the fourth particle reflection baffle 8 form a V-shaped closed structure. The third particle reflection baffle 7 and the fourth particle reflection baffle 8 are both used to reflect recycled particles and impurity particles towards the strike point. The second horizontal particle reflection baffle 10 is used to block the deposition of the plasma directly to the first wall of the vacuum chamber; one end of the second horizontal particle reflection baffle 10 is connected to the other end of the fourth particle reflection baffle 8.

[0048] (1) Third particle reflection baffle

[0049] The third particle reflection baffle 7 has the same function as the first particle reflection baffle 1, which will not be repeated here. The structure of the third particle reflection baffle is described below. The third particle reflection baffle 7 is composed of a second hidden flux zone particle reflection baffle 71 and a second neutral particle shielding layer baffle 72. One end of the second hidden flux zone particle reflection baffle 71 is connected to the other end of the second particle reflection baffle 2, and the other end of the second hidden flux zone particle reflection baffle 71 and one end of the second neutral particle shielding layer baffle 72 form a second pumping port, the width of the second pumping port can be selected as 30mm, and the other end of the second neutral particle shielding layer baffle 72 is connected to one end of the fourth particle reflection baffle 8.

[0050] (2) Fourth particle reflection baffle

[0051] The fourth particle reflection baffle 8 has the same function as the second particle reflection baffle 2, which will not be repeated here. It should be noted that the fourth particle reflection baffle 8 is perpendicular to the horizontal plane.

[0052] In summary, the second hidden flux zone particle reflection baffle 71, the second neutral particle shielding layer baffle 72 and the fourth particle reflection baffle 8 jointly constitute a second outer divertor of a V-shaped closed structure. The main function of the second outer divertor is to be compatible with various advanced divertors with large elongation ratios, to flexibly realize a relatively small elongation ratio and a triangularly deformed plasma position, to enable different positions of the HL-3 device to be switched with each other, and to improve the heat load mitigation capability of the divertor of the double-V-shaped closed structure.

[0053] The inner divertor, the first outer divertor and the second outer divertor jointly constitute a divertor with a double-V-shaped closed structure. The particles and energy flows flowing out of the core plasma will be deposited on the surface of the divertor target plate along the open magnetic field lines in the poloidal direction. When a large-elongation large-triangularly deformed double-zero divertor high-performance plasma operating condition is realized, the energy flows and particles flowing out of the core will be directly deposited on the first outer divertor. When a relatively small elongation ratio operating condition is realized, the energy flows and particle flows flowing out of the core will directly enter the second outer divertor. The first outer divertor and the second outer divertor can effectively confine the recycled particles and impurity particles in the divertor zone, improve the radiation level of the divertor, facilitate the realization of divertor target-shedding, improve the neutral particle pressure in the divertor zone, and enhance the pumping capability of the divertor. Thus, the target-shedding capability, particle control capability and core high-performance plasma compatibility of the divertor of the HL-3 device are enhanced.

[0054] In order to reserve the pumping port, the third particle reflection baffle 7 is composed of a separate second hidden flux zone particle reflection baffle 71 and a second neutral particle shielding layer baffle 72. In addition, in the present embodiment, the divertor with a double-V-shaped closed structure does not have a DOME or has a very small DOME dome, which mainly aims to weaken the confinement of recycled particles by the inner divertor and enhance the target-shedding capability of the outer divertor.

[0055] (3) Second horizontal particle reflection baffle

[0056] The second horizontal particle reflection baffle 10 is an over-target plate of the second outer divertor and the first wall, which can avoid the direct deposition of plasma on the first wall of the vacuum chamber and damage the material of the first wall. On the other hand, the second horizontal particle reflection baffle 10 enables the HL-3 device to realize an inverse triangular divertor magnetic field position, thereby providing a platform for the research on the plasma performance and the divertor target-shedding performance under the inverse triangular position.

[0057] 4. Cryogenic pump

[0058] In order to further improve the particle control ability and helium ash exhaust ability of the double-V-shaped closed structure of the divertor, a first cryogenic pump is installed at a position close to the first pumping port, and the first cryogenic pump is in communication with the first pumping port; a second cryogenic pump is installed at the position of the second pumping port, and the second cryogenic pump is in communication with the second pumping port. Thus, the divertor off-target and particle control ability are compatible. Otherwise, a large number of recirculating particles and impurity particles will flow back into the core plasma, affecting the plasma confinement performance, and even causing the device to discharge and break.

[0059] Embodiment 2

[0060] As shown in Figure 2 , numerical simulation research is carried out on the double-V-shaped closed divertor based on the present application by using the edge plasma program SOLPS-ITER. In order to highlight the advantages of the double-V-shaped closed divertor of the present application, an open divertor is compared. The main parameters input in the simulation include: heating power of 4.5 MW, scanning of core plasma density, and consideration of carbon impurity sputtering factor in the simulation. The simulation results show that, compared with the open divertor, the double-V-shaped closed divertor is very easy to achieve off-target, and the density threshold of off-target is 0.95×10 19 m -3 (upstream plasma zone at the outermost closed magnetic surface), as shown in Figure 2 . Figure 3 As shown in Figure 2 , the density distribution of neutral particles in the double-V-shaped closed divertor is obtained by SOLPS-ITER simulation, and all input parameters are consistent with Figure 3 , which shows that the V-shaped closed divertor can effectively close the recirculating neutral particles in the divertor target plate area, which is very beneficial to the off-target of the divertor, and the strong neutral particle pressure is beneficial to the pumping of the divertor. The compatibility of divertor off-target, particle control and core confinement is achieved.

[0061] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A double-V-shaped closed divertor compatible with multiple elongation ratios, characterized in that, include: The inner divertor is used to reflect the plasma, sending the recycle particles and impurity particles formed by the reflection into the outer divertor. The first external divertor includes: a first particle reflector (1) and a second particle reflector (2); the first particle reflector (1) and the second particle reflector (2) form a V-shaped closed structure; the first particle reflector (1) and the second particle reflector (2) are both used to reflect the recycled particles and the impurity particles toward the impact point. The second outer divertor includes a third particle reflector (7) and a fourth particle reflector (8); the third particle reflector (7) and the fourth particle reflector (8) form a V-shaped closed structure; the third particle reflector (7) and the fourth particle reflector (8) are both used to reflect the recycled particles and the impurity particles toward the impact point. The inner divertor includes: a vertical particle reflector (3) and a first horizontal particle reflector (4); one end of the vertical particle reflector (3) is connected to one end of the first horizontal particle reflector (4); the vertical particle reflector (3) is perpendicular to the first horizontal particle reflector (4); the other end of the first horizontal particle reflector (4) is connected to the first particle reflector (1); the first horizontal particle reflector (4) and the first particle reflector (1) form a dome. The first particle reflector (1) includes: a first concealed flux zone particle reflector (101) and a first neutral particle shielding layer baffle (102); the other end of the first horizontal particle reflector (4) is connected to one end of the first concealed flux zone particle reflector (101), and a first air extraction port is formed between the other end of the first concealed flux zone particle reflector (101) and one end of the first neutral particle shielding layer baffle (102), and the other end of the first neutral particle shielding layer baffle (102) is connected to one end of the second particle reflector (2); The third particle reflector (7) includes: a second concealed flux zone particle reflector (71) and a second neutral particle shielding layer baffle (72); one end of the second concealed flux zone particle reflector (71) is connected to the other end of the first neutral particle shielding layer baffle (102), and a second air extraction port is formed between the other end of the second concealed flux zone particle reflector (71) and one end of the second neutral particle shielding layer baffle (72), and the other end of the second neutral particle shielding layer baffle (72) is connected to one end of the fourth particle reflector (8).

2. The double V-shaped closed divertor compatible with multiple elongation ratios according to claim 1, characterized in that, The inner divertor further includes: an inclined particle reflector (5) for blocking the plasma from directly bombarding the first wall of the vacuum chamber and providing space for the plasma to move; one end of the inclined particle reflector (5) is connected to the other end of the vertical particle reflector (3).

3. A double V-shaped closed divertor compatible with multiple elongation ratios as described in claim 1, characterized in that, The fourth particle reflector (8) is perpendicular to the horizontal plane.

4. A double V-shaped closed divertor compatible with multiple elongation ratios according to claim 1, characterized in that, The second outer divertor further includes: a second horizontal particle reflector (10) for blocking the plasma from being directly deposited onto the first wall of the vacuum chamber; one end of the second horizontal particle reflector (10) is connected to the other end of the fourth particle reflector (8).

5. A double V-shaped closed divertor compatible with multiple elongation ratios according to claim 1, characterized in that, Both the first and second outer divertors have small dome vaults.

6. A double V-shaped closed divertor compatible with multiple elongation ratios according to claim 1, characterized in that, It also includes a first cryogenic pump and a second cryogenic pump; the first cryogenic pump is located near the first air extraction port and is connected to the first air extraction port; the second cryogenic pump is located near the second air extraction port and is connected to the second air extraction port.

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