Radial multi-needle-number probe for plasma boundary physical research

Abstract

The invention discloses a radial multi-needle-number probe for plasma boundary physical research, and relates to the technical field of plasma parameter measurement. Comprising a plurality of probe bodies; the first mounting plate is made of a ceramic material and is provided with a plurality of needle penetrating holes, and the needle penetrating holes are used for penetrating through the detection ends of the detection needle bodies; the second mounting plate is made of a ceramic material, one side surface of the second mounting plate is provided with a cable penetrating groove, the cable penetrating groove is provided with a plurality of cable penetrating holes, the cable penetrating holes and the needle penetrating holes are arranged in a one-to-one correspondence manner, and the cable penetrating holes are used for penetrating cables of the probe body; the third mounting plate is made of a ceramic material and can cover the cable penetrating groove; wherein the first installation plate, the second installation plate and the third installation plate are sequentially installed in a stacked mode, in the installation state, the detection section of the detection needle body protrudes out of the first installation plate, and a cable of the detection needle body is arranged in the cable penetrating groove. The requirement for parameter measurement of the magnetic confinement plasma device is met.

Description

Technical Field

[0001] The invention relates to the technical field of plasma parameter measurement, and in particular to a radial multi-needle probe for plasma boundary physics research. Background Art

[0002] In magnetic confinement plasma devices, probes are often used to study boundary temperature, density parameter profiles, boundary turbulence, and transport processes. As the parameters of magnetic confinement plasma devices increase, the plasma temperature and density further increase, but the probe window is often small, and the number of probes that can be arranged is small, especially in the radial direction. The number of spatial points is small (generally up to 8), the spatial resolution is low, and high-density arrangement cannot be achieved. In addition, the multi-needle structure leads to a large number of wire bundles, which are difficult to lead out, and then the overall thickness of the probe increases. And as an invasive diagnostic method, the probe is too large and will affect the main plasma discharge. Therefore, the existing multi-needle probes can no longer meet the needs of parameter measurement of magnetic confinement plasma devices. Summary of the invention

[0003] In view of the technical problem that existing multi-needle probes can no longer meet the needs of parameter measurement of magnetic confinement plasma devices, the present invention provides a radial multi-needle probe for plasma boundary physics research, which can achieve high integration, radial high-density arrangement, and high spatial resolution arrangement of the probes, and has the structural characteristics of heat load resistance, thin thickness and small volume, which is conducive to the development of related physical research and meets the needs of parameter measurement of magnetic confinement plasma devices.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention provides a radial multi-needle probe for plasma boundary physics research, comprising: a detection needle body, wherein a plurality of detection needle bodies are provided, and each of the detection needle bodies can detect the physical parameters of plasma; a first mounting plate, wherein the first mounting plate is made of ceramic material, and the first mounting plate is provided with a plurality of needle holes, and the needle holes are used to pass the detection end of the detection needle body; a second mounting plate, wherein the second mounting plate is made of ceramic material, and a cable threading groove is provided on one side of the second mounting plate, and the cable threading groove is provided with a plurality of cable threading holes, and the cable threading holes are arranged in a one-to-one correspondence with the needle holes, and the cable threading holes are used to pass the cables of the detection needle body; a third mounting plate, wherein the third mounting plate is made of ceramic material, and the third mounting plate can cover the cable threading groove; wherein the first mounting plate, the second mounting plate and the third mounting plate are installed in sequence in a stacked manner, and in the installed state, the detection section of the detection needle body protrudes from the first mounting plate, and the cable of the detection needle body is arranged in the cable threading groove.

[0006] The radial multi-needle probe for plasma boundary physics research provided by the present invention comprises a detection needle body, a first mounting plate, a second mounting plate and a third mounting plate. The first mounting plate, the second mounting plate and the third mounting plate are all made of ceramic materials, and can withstand the high temperature of plasma while having sufficient insulation performance. At the same time, the first mounting plate is provided with a plurality of needle holes, and the detection end of the detection needle body is inserted through the needle holes. A cable threading groove is provided on one side of the second mounting plate, and the cable threading groove is provided with a plurality of cable threading holes. The cable threading holes and the needle threading holes are arranged in a one-to-one correspondence, which is convenient for the lead-out and layout of cables, and realizes a high lead-out density of the wire harness, so that the wire harness is fixed and stable, and the service life is extended. In addition, the third mounting plate can cover the cable threading groove, thereby realizing the arrangement of radial multi-probes and the lead-out of multiple wire harnesses, and providing heat insulation protection for the cables through the third mounting plate, thereby realizing high integration and radial high-density arrangement of the probes, realizing high spatial resolution of detection, and being able to withstand heat load. The combination of the first mounting plate, the second mounting plate and the third mounting plate only needs to provide thermal protection for the cable of the detection needle body. It is thin in thickness and small in size, and will not affect the main plasma discharge, which is conducive to the development of related physical research.

[0007] Therefore, the present invention can achieve high integration, radial high-density arrangement, and high spatial resolution arrangement of the probes, and has the structural characteristics of heat load resistance, thin thickness and small volume, which is conducive to the development of related physical research and meets the needs of parameter measurement of magnetic confinement plasma devices.

[0008] In an optional embodiment of the present application, the detection needle body includes: a probe rod, which is used to detect physical parameters of plasma; a protective cover, which is mounted on the outside of the probe rod, and the protective cover is made of ceramic material. The protective cover is embedded in the first mounting plate, and the end of the protective cover away from the first mounting plate protrudes from the first mounting plate; wherein the detection end of the probe rod extends outside the protective cover to insulate and protect the probe rod through the protective cover made of ceramic material, thereby preventing short circuits between needles caused by surface coating of the bottom first mounting plate and ensuring the straightness of the probe.

[0009] In an optional embodiment of the present application, the probe rod is a tungsten rod to increase the heat resistance of the probe rod, reduce the generation of sputtered impurities and secondary electron emission, and improve the discharge quality and accuracy of probe diagnosis.

[0010] In an optional embodiment of the present application, the detection needle body also includes: a conductive connector, a limiting boss is provided in the middle of the conductive connector, one end of the conductive connector is fixedly connected to the probe rod, and the other end of the conductive connector is used to connect the cable; a pressure spring, one end of the pressure spring is sleeved on the outside of the other end of the conductive connector and pressed against the limiting boss, and the other end of the pressure spring is pressed against the outside of the end of the corresponding cable threading hole, so that under the action of the pressure spring, the probe rod is fully extended forward to fill the gap between the conductive connector and the first connecting plate, so that the height of the probe rod is consistent, ensuring that the probe is flush and fits, and playing a buffering role when the detection needle body is subjected to a strong thermal shock.

[0011] In an optional embodiment of the present application, a first limiting groove is provided at one end of the first mounting plate, and a second limiting groove is provided at one end of the second mounting plate. The second limiting groove is provided on the same side as the first limiting groove, so as to ensure the coaxiality of the needle threading hole and the cable threading hole through the cooperation of the first limiting groove and the second limiting groove with the same limiting member.

[0012] In an optional embodiment of the present application, it also includes a mounting bracket, which includes: a mounting frame body, one end of which is fixedly connected to a stacked body composed of the first mounting plate, the second mounting plate and the third mounting plate; a cable threading frame body, one end of which is fixedly connected to the other end of the mounting frame body, and a cable laying through hole is provided in the middle of the cable threading frame body, and the cable laying through hole is connected to the cable threading groove to facilitate the fixation of the first mounting plate, the second mounting plate and the third mounting plate, and to facilitate the lead-out of the cables.

[0013] In an optional embodiment of the present application, the mounting frame is provided with a cantilever section, and a mounting groove is provided on the side of the third mounting plate away from the second mounting plate, and the mounting groove is adapted to the cantilever section to improve the stability of the overall fixation of the probe.

[0014] In an optional embodiment of the present application, one end of the cable threading groove is closed and the other end is connected to the second limiting groove to facilitate the production and processing of the second mounting plate.

[0015] In an optional embodiment of the present application, the plurality of detection needles are distributed in multiple rows, and the detection needles in two adjacent rows are staggered to avoid mutual obstruction of the detection needles.

[0016] In an optional embodiment of the present application, the first mounting plate, the second mounting plate and the third mounting plate are each provided with a plurality of corresponding mounting holes to facilitate the assembly of the probe.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. The radial multi-needle probe for plasma boundary physics research provided by the present invention comprises a detection needle body, a first mounting plate, a second mounting plate and a third mounting plate. The first mounting plate, the second mounting plate and the third mounting plate are all made of ceramic materials. While having sufficient insulation performance, they can withstand the high temperature of plasma. At the same time, the first mounting plate is provided with a plurality of needle holes, and the detection end of the detection needle body is inserted into the needle hole. A cable threading groove is provided on one side of the second mounting plate, and the cable threading groove is provided with a plurality of cable threading holes. The cable threading holes and the needle threading holes are arranged one by one, and the third mounting plate can cover the cable threading groove. Thus, the radial multi-probe arrangement and the lead-out of multiple wire harnesses can be realized, and the cables are provided with heat insulation protection through the third mounting plate, thereby realizing high integration and radial high-density arrangement of the probes, realizing high spatial resolution of detection, and being able to withstand heat load, meeting the requirements of parameter measurement of magnetic confinement plasma devices.

[0019] 2. The radial multi-needle probe for plasma boundary physics research provided by the present invention is a combination of a first mounting plate, a second mounting plate and a third mounting plate, which only needs to provide thermal protection for the cable of the detection needle body. It is thin in thickness and small in size, and will not affect the main plasma discharge, which is conducive to the development of related physical research.

[0020] 3. The radial multi-needle probe for plasma boundary physics research provided by the present invention has a cable threading groove on one side of the second mounting plate, and the cable threading groove is provided with a plurality of cable threading holes, and the cable threading holes are arranged one by one corresponding to the needle threading holes, which is convenient for the lead-out and layout of the cables, realizes a high lead-out density of the wire harness, makes the wire harness fixed and stable, and prolongs its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] In the attached picture:

[0023] Figure 1 A schematic front view of a radial multi-needle probe for plasma boundary physics research provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the rear view structure of a radial multi-needle probe for plasma boundary physics research provided by an embodiment of the present invention;

[0025] Figure 3A schematic diagram of an exploded structural view of the main part of a radial multi-needle probe for plasma boundary physics research provided by an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the explosion structure of the detection needle body according to an embodiment of the present invention;

[0027] Figure 5 It is a bottom view structural schematic diagram of the first mounting plate according to an embodiment of the present invention;

[0028] Figure 6 It is a bottom view structural schematic diagram of the second mounting plate according to an embodiment of the present invention;

[0029] Figure 7 It is a bottom view structural schematic diagram of the third mounting plate according to an embodiment of the present invention.

[0030] Marks and corresponding parts names in the attached drawings:

[0031] 10-detection needle body, 11-probe rod, 12-protection cover, 13-conductive connecting piece, 13a-limiting boss, 14-pressing spring;

[0032] 20-first mounting plate, 21-needle hole, 22-first limiting groove;

[0033] 30-second mounting plate, 31-cable threading groove, 32-cable threading hole, 33-second limiting groove;

[0034] 40-third mounting plate, 41-mounting slot;

[0035] 50-installation bracket, 51-installation frame, 52-cable threading frame. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present application, it should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0040] It should be noted that as the parameters of the magnetic confinement plasma device increase, the plasma temperature and density further increase, but the probe window is often small, and the number of probes that can be arranged is small, especially in the radial direction, with a small number of spatial points (generally up to 8), low spatial resolution, and inability to achieve high-density arrangement. In addition, the multi-needle structure leads to more wire bundles and difficulty in leading out, which in turn increases the overall thickness of the probe. And as an invasive diagnostic method, a probe that is too large will affect the main plasma discharge.

[0041] In order to solve the above-mentioned problems, the inventor innovatively designed the following technical solution, and the specific implementation solution of this application will be described in detail with reference to the accompanying drawings.

[0042] Example

[0043] Combination Figure 1-Figure 3 The present invention provides a radial multi-needle probe for plasma boundary physics research, comprising: a detection needle body 10, wherein the detection needle body 10 is provided with a plurality of detection needle bodies, and each of the detection needle bodies 10 can detect the physical parameters of the plasma; a first mounting plate 20, wherein the first mounting plate 20 is made of ceramic material, and the first mounting plate 20 is provided with a plurality of needle holes 21, wherein the needle holes 21 are used to penetrate the detection end of the detection needle body 10; a second mounting plate 30, wherein the second mounting plate 30 is made of ceramic material, and a cable threading groove 31 is provided on one side of the second mounting plate 30, and the cable threading groove 31 is provided with a plurality of cable threading holes 32, and the cable threading holes 32 are arranged one by one corresponding to the needle threading holes 21, and the cable threading holes 32 are used to thread the cables of the detection needle body 10; a third mounting plate 40, the third mounting plate 40 is made of ceramic material, and the third mounting plate 40 can cover the cable threading groove 31; wherein, the first mounting plate 20, the second mounting plate 30 and the third mounting plate 40 are installed in sequence in a stacked manner, and in the installed state, the detection section of the detection needle body 10 protrudes from the first mounting plate 20, and the cables of the detection needle body 10 are arranged in the cable threading groove 31.

[0044] It should be understood that multiple detection needle bodies 10 can be freely combined into array dual probe, single probe, and suspended potential probe working modes according to experimental requirements to effectively analyze and diagnose boundary plasma temperature, density, electric field, parameter profile, turbulence and transport conditions, thereby carrying out a number of physical studies. In addition, the multiple detection needle bodies 10 are distributed in multiple rows, and the detection needle bodies 10 in two adjacent rows are staggered to avoid mutual obstruction of the detection needle bodies 10. In this embodiment, a total of 36 probe detection needle bodies 10 are designed, and 36 probe rods 11 are arranged in a 3×12 array, that is, 3 rows, 12 probes in each row, and the rows are staggered by a certain distance to avoid obstruction.

[0045] Combination Figure 4 The detection needle body 10 includes: a probe rod 11, which is used to detect the physical parameters of plasma; a protective cover 12, which is sleeved on the outside of the probe rod 11, and the protective cover 12 is made of ceramic material. The protective cover 12 is embedded in the first mounting plate 20, and the end of the protective cover 12 away from the first mounting plate 20 protrudes from the first mounting plate 20; wherein, the detection end of the probe rod 11 extends outside the protective cover 12, so as to insulate and protect the probe rod 11 through the protective cover 12 of ceramic material, prevent the short circuit between needles caused by the surface coating of the bottom first mounting plate 20, and ensure the alignment of the detection needle body 10.

[0046] If the probe rod 11 is made of carbon material, it will face problems such as sputtering, coating, deposition short circuit, etc., and its durability is poor. In this regard, in this embodiment, the probe rod 11 is a tungsten rod to increase the heat resistance of the probe rod 11, reduce the generation of sputtering impurities and secondary electron emission, and improve the discharge quality and the accuracy of probe diagnosis.

[0047] On this basis, the detection needle body 10 also includes: a conductive connector 13, a limiting boss 13a is arranged in the middle of the conductive connector 13, one end of the conductive connector 13 is fixedly connected to the probe rod 11, and the other end of the conductive connector 13 is used to connect the cable; a pressure spring 14, one end of the pressure spring 14 is sleeved on the other end of the conductive connector 13 and pressed against the limiting boss 13a, and the other end of the pressure spring 14 is pressed against the end of the corresponding cable threading hole 32, so that under the action of the pressure spring 14, the probe rod 11 is fully extended forward to fill the gap between the conductive connector 13 and the first connecting plate, so that the height of the probe rod 11 is consistent, ensuring that the probe is flush and fits, and plays a buffering role when the detection needle body 10 is subjected to a strong thermal shock.

[0048] Specifically, the conductive connector 13 is made of copper or copper alloy and has a three-section design, which is thick in the middle and thin at both ends. The middle part plays a fixing role, one of the two ends is crimped and fixed to the tungsten probe rod 11, and the other end is connected to the signal cable, which well connects the probe rod 11 and the signal line; at the same time, the pressure spring 14 is sleeved on the other end of the conductive connector 13, and the tail is supported by the second mounting plate 30 in the middle, so that the probe can be fully extended forward to fill the gap between the conductive connector 13 and the first mounting plate 20, so that the front end probe height is consistent.

[0049] Combination Figure 5 In this embodiment, the first mounting plate 20 is used to fix the detection needle body 10, and 36 holes (needle holes 21) are opened in the middle to install the detection needle body 10, the conductive connector 13 and the pressure spring 14. Since the conductive connector 13 (copper part) will be squeezed and deformed during the crimping process, the needle hole 21 is designed with a gap, that is, the diameter of the needle hole 21 is slightly larger than the outer diameter of the conductive connector 13 to prevent the non-coaxiality caused by the crimping process of the conductive connector 13 and ensure the feasibility of assembly.

[0050] Combination Figure 6 The second mounting plate 30 is used for threading and pressing the top pressure spring 14, and can fix the detection needle body 10 together with the first mounting plate 20. The cable threading groove 31 arranged at the bottom is convenient for wiring, and the cable threading hole 32 arranged at the bottom of the cable threading groove 31 can fix the wiring harness led out of the detection needle body 10 to prevent the cable connector from being disconnected due to force during use, and can separate the cables from each other to avoid conduction at the tail wiring point.

[0051] At the same time, a first limiting groove 22 is provided at one end of the first mounting plate 20, and a second limiting groove 33 is provided at one end of the second mounting plate 30. The second limiting groove 33 is provided on the same side as the first limiting groove 22, so as to ensure the coaxiality of the needle threading hole 21 and the cable threading hole 32 through the cooperation between the first limiting groove 22 and the second limiting groove 33 and the same limiting member.

[0052] Among them, one end of the cable threading groove 31 is closed, and the other end is connected to the second limiting groove 33, so as to facilitate the production and processing of the second mounting plate 30. It can be understood that the multi-pin probe needs to lead out more wires and the space is small, so the design of the second limiting groove 33 can increase the accommodation space of the tail, facilitate the wiring adjustment, and achieve the design purpose of high lead-out density and small volume.

[0053] Combine again Figure 1 and Figure 2This embodiment also includes an installation bracket 50, and the installation bracket 50 includes: an installation frame body 51, one end of the installation frame body 51 is fixedly connected to the stacked body composed of the first installation plate 20, the second installation plate 30 and the third installation plate 40; a cable threading frame body 52, one end of the cable threading frame body 52 is fixedly connected to the other end of the installation frame body 51, and a cable laying through hole is provided in the middle of the cable threading frame body 52, and the cable laying through hole is connected to the cable threading groove 31, so as to facilitate the fixation of the first installation plate 20, the second installation plate 30 and the third installation plate 40, and at the same time facilitate the lead-out of the cables.

[0054] Combination Figure 2 and Figure 7 The mounting frame 51 is provided with a cantilever section, and the side of the third mounting plate 40 away from the second mounting plate 30 is provided with a mounting groove 41 (T-shaped groove), and the mounting groove 41 is adapted to the cantilever section to improve the stability of the overall fixation of the probe, so that the overall fixation of the probe is stable and does not loosen. The mounting bracket 50 is usually made of stainless steel.

[0055] That is, the bottom ceramic plate (third mounting plate 40 ) is used to protect the signal harness, and a groove is formed at the back thereof for supporting in cooperation with the mounting bracket 50 .

[0056] It can be understood that the first mounting plate 20, the second mounting plate 30 and the third mounting plate 40 are all provided with a plurality of corresponding mounting holes to facilitate the assembly of the probe. In this embodiment, the mounting holes on the first mounting plate 20 include countersunk holes, the mounting holes on the second mounting plate 30 include plain through holes, and the mounting holes on the third mounting plate 40 include countersunk holes for placing fixing nuts, so that the fixing screws are sunk into the ceramic to avoid the generation of ablated impurities that affect the discharge, while providing the overall aesthetics of the probe.

[0057] In summary, the radial multi-needle probe for plasma boundary physics research provided in this embodiment includes a detection needle body 10, a first mounting plate 20, a second mounting plate 30, a third mounting plate 40 and a mounting bracket 50. Since the first mounting plate 20, the second mounting plate 30 and the third mounting plate 40 are all made of ceramic materials, and the probe rod 11 is a tungsten rod, while having sufficient insulation performance, it can withstand the high temperature of the plasma and reduce the generation of sputtered impurities and secondary electron emission, thereby improving the discharge quality and the accuracy of the probe diagnosis. At the same time, the first mounting plate 20 is provided with a plurality of needle holes 21, and the detection end of the detection needle body 10 is inserted into the needle hole 21. A cable threading groove 31 is provided on one side of the second mounting plate 30, and the cable threading groove 31 is provided with a plurality of cable threading holes 32. The cable threading holes 32 are arranged one by one with the needle threading holes 21, which is convenient for the lead-out and layout of the cable, and a high lead-out density of the wiring harness is achieved, so that the wiring harness is fixed and stable, and the service life is extended. In addition, the third mounting plate 40 can cover the cable threading groove 31.

[0058] Thus, this embodiment can realize the arrangement of radial multi-probes and the lead-out of multiple wire harnesses, and provide thermal insulation protection for the cables through the third mounting plate 40, thereby realizing high integration and radial high-density arrangement of the probes, realizing high spatial resolution of detection, and being able to withstand thermal load. The combination of the first mounting plate 20, the second mounting plate 30, and the third mounting plate 40 only needs to provide thermal protection for the cables of the detection needle body 10, has a thin thickness and a small volume, and will not affect the main plasma discharge, which is conducive to the development of related physical research.

[0059] In summary, this embodiment can achieve high integration, radial high-density arrangement, and high spatial resolution arrangement of the probes, and has the structural characteristics of heat load resistance, thin thickness and small volume, which is conducive to the development of related physical research and meets the needs of parameter measurement of magnetic confinement plasma devices.

[0060] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A radial multi-needle probe for plasma boundary physics research, characterized in that: include: A detection needle body (10), wherein a plurality of the detection needle bodies (10) are provided, and each of the detection needle bodies (10) is capable of detecting a physical parameter of plasma; A first mounting plate (20), wherein the first mounting plate (20) is made of a ceramic material and is provided with a plurality of pinholes (21), wherein the pinholes (21) are used to penetrate the detection end of the detection pin body (10); A second mounting plate (30), wherein the second mounting plate (30) is made of ceramic material, a side surface of the second mounting plate (30) is provided with a cable threading groove (31), and the cable threading groove (31) is provided with a plurality of cable threading holes (32), the cable threading holes (32) are arranged in a one-to-one correspondence with the needle threading holes (21), and the cable threading holes (32) are used to thread the cables of the detection needle body (10); A third mounting plate (40), the third mounting plate (40) being made of ceramic material, and the third mounting plate (40) being capable of covering the cable threading groove (31); The first mounting plate (20), the second mounting plate (30) and the third mounting plate (40) are installed in sequence, and in the installed state, the detection section of the detection needle body (10) protrudes from the first mounting plate (20), and the cable of the detection needle body (10) is laid in the cable threading groove (31).

2. The radial multi-needle probe for plasma boundary physics research according to claim 1, characterized in that: The detection needle body (10) comprises: A probe rod (11), wherein the probe rod (11) is used to detect physical parameters of the plasma; A protective cover (12), wherein the protective cover (12) is sleeved outside the probe rod (11), the protective cover (12) is made of ceramic material, the protective cover (12) is embedded in the first mounting plate (20), and one end of the protective cover (12) away from the first mounting plate (20) protrudes from the first mounting plate (20); Wherein, the detection end of the probe rod (11) extends outside the protective cover (12).

3. The radial multi-needle probe for plasma boundary physics research according to claim 2, characterized in that: The probe rod (11) is a tungsten rod.

4. The radial multi-needle probe for plasma boundary physics research according to claim 2, characterized in that: The detection needle body (10) further comprises: A conductive connecting piece (13), wherein a limiting boss (13a) is provided in the middle of the conductive connecting piece (13), one end of the conductive connecting piece (13) is fixedly connected to the probe rod (11), and the other end of the conductive connecting piece (13) is used for connecting a cable; A pressure spring (14), one end of which is sleeved outside the other end of the conductive connector (13) and pressed against the limiting boss (13a), and the other end of which is pressed against the end of the corresponding cable threading hole (32).

5. The radial multi-needle probe for plasma boundary physics research according to claim 1, characterized in that: A first limiting groove (22) is provided at one end of the first mounting plate (20), and a second limiting groove (33) is provided at one end of the second mounting plate (30), wherein the second limiting groove (33) is provided on the same side as the first limiting groove (22).

6. The radial multi-needle probe for plasma boundary physics research according to claim 5, characterized in that: Also included is a mounting bracket (50), the mounting bracket (50) comprising: A mounting frame (51), one end of the mounting frame (51) being fixedly connected to a stacked body consisting of the first mounting plate (20), the second mounting plate (30) and the third mounting plate (40); A cable threading frame body (52), one end of the cable threading frame body (52) is fixedly connected to the other end of the mounting frame body (51), a cable laying through hole is provided in the middle of the cable threading frame body (52), and the cable laying through hole is communicated with the cable threading groove (31).

7. The radial multi-needle probe for plasma boundary physics research according to claim 6, characterized in that: The mounting frame (51) is provided with a cantilever section, and a mounting groove (41) is provided on a side of the third mounting plate (40) away from the second mounting plate (30), and the mounting groove (41) is adapted to the cantilever section.

8. The radial multi-needle probe for plasma boundary physics research according to claim 5, characterized in that: One end of the cable threading groove (31) is closed, and the other end is communicated with the second limiting groove (33).

9. The radial multi-needle probe for plasma boundary physics research according to any one of claims 1 to 8, characterized in that: The plurality of detection needle bodies (10) are distributed in multiple rows, and the detection needle bodies (10) in two adjacent rows are staggered.

10. The radial multi-needle probe for plasma boundary physics research according to any one of claims 1 to 8, characterized in that: The first mounting plate (20), the second mounting plate (30) and the third mounting plate (40) are each provided with a plurality of corresponding mounting holes.

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