CN108040415B - Integrated Modular Probe System for Tungsten Copper Targets - Google Patents

Abstract

The invention discloses an integrated modular probe system suitable for a tungsten-copper target plate, comprising a tungsten-copper target plate and a probe assembly. The tungsten copper target plate is welded by a tungsten sheet, an oxygen-free pure copper adaptation layer and a chromium zirconium copper base. The chromium zirconium copper base is divided into two water-cooled pipes by an intermediate spacer. The water copper pipe and the water outlet copper pipe are welded and connected. The probe assembly includes a probe head, a front-end ceramic ring, a copper connector, a rear-end ceramic ring, a spring washer, a top screw, a wiring screw and a wire, and is installed in the probe hole in the chrome-zirconium-copper base, where the probe is The needles are available in tungsten copper or pure graphite construction. The invention adopts an integrated modular structure, makes full use of the space of the target plate, can be disassembled and assembled as a whole, has no welding fixing structure, and has no risk of damage to the target plate during disassembly and maintenance; the probe system has a simple and compact structure, and has higher spatial resolution; The measurement accuracy of the probe system is improved.

Description

Integrated Modular Probe System for Tungsten Copper Targets

technical field

The invention relates to the field of high-temperature plasma diagnostic systems, in particular to an integrated modular probe system suitable for a tungsten-copper target plate.

Background technique

The Langmuir probe diagnostic system is a conventional diagnostic method in plasma diagnostics, which is mainly composed of two main components, a probe head contacting plasma and a back-end measurement circuit. According to the Langmuir probe measurement theory, it can usually be divided into three measurement methods: single probe, double probe and triple probe. The back-end circuit of single probe and double probe measurement needs to use scanning voltage to be applied to the probe head. On the other hand, the three probes need to add a suitable bias voltage; according to the sheath principle, the theoretical method of parameter calculation is also different for different probe head structures. Commonly used ones include needle, cylindrical and spherical The size selection depends on the Debye length of the plasma sheath, the magnetic field strength and the particle element. In addition, due to the sputtering, erosion and other effects between the plasma and the material, especially in the high-temperature plasma, the material selection of the probe needs to be comprehensively considered. At present, tungsten, pyrolytic graphite, High temperature and corrosion resistant materials such as carbon fiber composite materials (CFC).

In high-temperature plasmas, the Langmuir probe faces great challenges. Due to the higher plasma temperature, the interaction between the material of the probe head is stronger, resulting in ablation and melting of the probe. Although the Langmuir probe has some limitations in the measurement of high temperature plasma, it is still an indispensable diagnostic tool in most high temperature plasma discharge devices. In plasma, in order to prolong the service life of the probe head and improve the measurement accuracy, it is necessary to use better anti-ablation and high-temperature resistant materials, have an effective heat dissipation structure, and be able to protect the probe head when it is damaged by ablation. Simple and convenient replacement.

At present, many types of target plates or first wall structures of high-temperature plasma discharge devices have been developed, such as a tungsten-copper module for high thermal load components of fusion devices disclosed in Patent ZL201310403372.4. For the high wettability and high creep relaxation of pure copper, a soft oxygen-free pure copper adaptation layer is designed between tungsten and copper as a buffer, thereby reducing the interfacial stress and increasing the interfacial bonding force. At present, the connection technology of oxygen-free pure copper and tungsten includes active metal casting, hot pressing and hot isostatic pressing, etc. The connection technology of oxygen-free pure copper and chromium zirconium copper heat sink includes brazing, explosive welding and hot isostatic pressing and other connection methods. The tungsten-copper module described in the patent is made of tungsten sheet, oxygen-free pure copper adaptation layer and chromium-zirconium-copper alloy heat sink material through various connection methods, which can withstand the impact of high thermal load. In addition, there is also a tungsten-copper string tube structure, which is prepared by brazing and other methods. Both of these structures have been applied to the EAST tokamak device as the first wall structure of the divertor target plate (J. Li et al., Phys. Scripta. T159, 014001 (2014).) to improve the EAST bias. Filter heat load capacity.

Patent ZL201410437565.6 mentioned a target plate probe system suitable for all tungsten divertors of EAST tokamak devices. verified in the process. However, this system is only suitable for the tungsten-copper string structure, and its spatial resolution is limited by the tungsten-copper string structure and the back-end support structure of the probe. At the same time, the assembly process is complicated, and it is difficult to ensure the final assembly accuracy. In addition, the probe system may be damaged due to high thermal load or other engineering factors during the EAST operation stage. If the rear support connection parts are damaged, they need to be disassembled for maintenance operations. When the need to disassemble and repair occurs, on the one hand, if the tungsten-copper string pipe structure is not damaged, it will not be disassembled according to the priority of the EAST system, and the target probe system will not be repaired; On the premise of dismantling the tungsten-copper string pipe, since the probe system is fixed by welding, cutting operation is required during disassembly, so there is a risk of damaging the tungsten-copper string pipe structure.

SUMMARY OF THE INVENTION The purpose of the present invention is to provide an integrated modular probe system suitable for a tungsten copper target, so as to measure plasma parameters on the surface of the target.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An integrated modular probe system suitable for a tungsten-copper target plate is characterized in that it includes an integrated module composed of a tungsten-copper target plate and a plurality of probe assemblies, wherein the tungsten-copper target plate includes a chromium-zirconium-copper base, a chromium-zirconium-copper There is a cavity in the base, the top of the chrome-zirconium-copper base is open, and the opening is covered and connected with oxygen-free pure copper adaptation layer and tungsten sheet from bottom to top, and the cavity of the chrome-zirconium-copper base is separated by the middle. The seat partition is divided into two water-cooling pipes, and the rear ends of the two water-cooling pipes are connected by a connecting pipe. The front end of one water-cooling pipe is connected with a water inlet pipe, and the front end of the other water-cooling pipe is connected with a water outlet pipe, which is downward from the middle of the top surface of the tungsten sheet. There are a plurality of probe holes vertically arranged along the long side of the water-cooled pipeline, and each probe hole vertically penetrates the middle space of the tungsten sheet, the oxygen-free pure copper adaptation layer, and the chromium zirconium copper base. The upper end of the probe assembly is exposed from the orifice of the probe hole on the top surface of the tungsten sheet or is flush with the top surface of the tungsten sheet, and the lower end of the probe assembly is connected with a wire , and the wire is passed through the hole of the probe hole on the bottom surface of the chrome zirconium copper base.

The integrated modular probe system suitable for the tungsten-copper target plate is characterized in that: the probe hole is a stepped hole with a thin top and a thick bottom, wherein the small hole is located in the tungsten sheet and the oxygen-free pure copper adaptation layer, The large hole is located in the middle spacer of the chrome zirconium copper base;

The probe assembly includes a front-end ceramic ring coaxially arranged in the upper end of the large hole, a rear-end ceramic ring coaxially arranged in the large hole and located below the front-end ceramic ring, and the ring holes of the front and rear ceramic rings are steps. Through holes, and the front ceramic ring is close to the junction of the large hole and the small hole in the stepped hole; the large hole is located between the front and rear ceramic rings coaxially with a copper connector, the copper connector is stepped cylindrical, and the copper connection The upper and lower ends of the parts are respectively assembled in the ring holes of the front ceramic ring and the rear ceramic ring, and the front and rear ceramic rings are used to fix the collimated copper connectors, and the copper connectors are insulated from the chrome zirconium copper base;

The upper and lower end faces of the copper connecting piece are respectively machined with threaded holes, wherein the threaded holes at the upper end of the copper connecting piece are coaxially threaded with a probe head, and the probe head passes upward from the orifice of the probe hole on the top surface of the tungsten sheet, or The upper end of the probe head is flush with the top surface of the tungsten sheet;

The probe assembly also includes a set screw coaxially arranged at the inner and lower ends of the large holes, the inner and lower ends of the large holes in the stepped holes are formed with internal threads, the top tightening screws are threadedly assembled on the inner and lower ends of the large holes, and the middle of the top tightening screws is coaxially arranged. There is a through hole, and a spring washer is arranged between the top-tightening screw and the rear-end ceramic ring in the large hole, and the spring washer is clamped by the top-tightening screw and the rear-end ceramic ring;

The threaded hole at the lower end of the copper connector is coaxially threaded with a wiring screw, the lower end of the wiring screw passes through the spring washer and extends into the through hole of the jacking screw, and the lower end of the wiring screw is processed into a tubular extension, and the tubular extension is connected with a wire, The wires pass through the lower end of the through hole of the top screw and finally pass through the bottom surface of the chrome zirconium copper base.

The integrated modular probe system suitable for tungsten copper target plate is characterized in that: the bottom surface of the top tightening screw is provided with a rectangular notch, so that the screw can be tightened with a tool, the probe assembly can be firmly fixed, and the top tightening screw can be tightened Then do the edge anti-loosening treatment.

The integrated modular probe system suitable for the tungsten copper target plate is characterized in that: the wire is a high temperature resistant glass filament mica braided copper wire.

The integrated modular probe system suitable for the tungsten copper target plate is characterized in that: the connecting pipe, the water inlet pipe and the water outlet pipe are all made of stainless steel and correspond to the water cooling pipes of the chrome zirconium copper base by brazing The water inlet pipe and the water outlet pipe are respectively connected with the water cooling pipes of the external system by welding to form a water cooling loop to realize the overall cooling of the system of the present invention.

The integrated modular probe system suitable for tungsten copper target plate is characterized in that: the probe head can be made of graphite material, the lower end of the probe head is a threaded post, and the end is screwed to the copper connector Inside the upper screw hole; the top of the probe head is the top of the ball, the top of the ball protrudes from the top surface of the tungsten sheet, the bottom of the top of the ball is a cylinder, and between the cylinder and the threaded column is a cylinder with flattened sides, so that it can be clamped with a special clamp, and Tighten the thread, the size of which is larger than the diameter of the cylinder at both ends and the diameter of the thread cylinder, so as to be close to the front end ceramic ring.

The integrated modular probe system suitable for tungsten-copper target plate is characterized in that: the probe head can also be made of tungsten-copper material, and its structure is basically the same as that of the probe head made of graphite material , the difference is that since tungsten is a metal and has hot-melt properties, the top of the ball top at the upper end of the probe head needs to be flat-topped cylindrical, and the top of the flat top is flush with the top surface of the tungsten sheet, which constitutes a flush probe form. To avoid excessive temperature concentration caused by the protrusion of the dome, the tungsten probe head will melt and cause adhesion. At the same time, because the tungsten material cannot process threads, the threaded end is a tungsten cylindrical surface and is welded with an oxygen-free pure copper round sleeve by hot pressing. connection, and then threading.

The beneficial effects of the present invention are:

The invention proposes an integrated modularized probe system suitable for a tungsten-copper target plate. The system adopts an integrated modularized structure, and the probe system is integrated on the tungsten-copper target plate, which can realize overall disassembly and assembly, and can make full use of the target. Board space, increase probe space distribution. The present invention does not use a welding connection structure, and there is no risk of damage to the target plate structure when disassembling and repairing the probe assembly; the entire probe system has a simple and compact structure and high spatial resolution; at the same time, it has an independent water-cooling structure, which can effectively maintain the probe temperature , to ensure the accuracy of probe measurement; at the same time, the entire module can be disassembled and the probe assembly can be assembled again, which can ensure higher assembly accuracy, thereby improving the measurement accuracy of the probe system; the probe system can be installed with a tungsten probe The needle head enables the probe system to work continuously in a higher temperature or longer plasma discharge environment, improves the durability of the probe, and is fully applicable to future nuclear fusion experimental devices with higher parameters.

Description of drawings

Figure 1 is a front view of the integrated modular probe system.

Figure 2 is a top view of the integrated modular probe system.

Figure 3 is an axonometric view of the integrated modular probe system.

Figure 4 Schematic diagram of the structure of the tungsten probe head and the graphite probe head.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the present invention includes a tungsten copper target plate and a probe assembly 14 , which form an integrated module after assembly, which can be easily disassembled. The tungsten copper target plate is welded by a tungsten sheet 4, an oxygen-free pure copper adaptation layer 5 and a chrome zirconium copper base 6. The chrome zirconium copper base is divided into two water-cooling pipes 15 and two water-cooling pipes by an intermediate spacer. The connecting pipe 1 is welded between the rear ends of the 15 water cooling pipes 15 , the front end of one water cooling pipe 15 is welded with the water inlet pipe 7 , and the front end of the other water cooling pipe 15 is welded with the water outlet pipe 16 . The probe assembly 14 includes a probe head 3 , a front-end ceramic ring 2 , a copper connector 13 , a rear-end ceramic ring 12 , a spring washer 8 , a top screw 10 , a connection screw 11 and a wire 9 , and is installed in two water cooling pipes 15 between the probe holes.

The tungsten copper target plate is prepared by the method disclosed in the known patent ZL201310403372.4. The connecting pipe 1, the water inlet pipe 7 and the water outlet pipe 16 are made of stainless steel, and are connected to the water cooling pipe of the chrome zirconium copper base 6 by brazing. 15; The water pipe 7 and the water outlet pipe 16 are connected with the water cooling pipe of the external system by welding to form a water cooling loop to realize the overall cooling of the system of the present invention; and step holes are processed between the water inlet and outlet pipes of the tungsten copper target plate, wherein the large hole is located in the chromium The middle spacer of the zirconium copper base is machined with threads, and the small hole is located in the tungsten sheet.

The probe assembly 14 is installed in the stepped hole on the tungsten-copper target plate. The front-end ceramic ring 2 and the rear-end ceramic ring 12 are made of boron nitride ceramics. The diameters of the outer circles at both ends of the connecting piece 13 correspond to each other, and play a role of fixing and collimating.

The front-end ceramic ring 2 is placed in the large hole of the stepped hole on the tungsten-copper target plate, and is close to the end face at the junction of the large hole and the small hole; the copper connector 13 is a stepped cylindrical shape and is placed on the front-end ceramic ring 2 and the rear end Between the ceramic rings 12, the copper connector 13 is insulated from the chrome-zirconium-copper base, and the two ends are machined with threaded holes of different sizes, which are used to screw the probe head 3 and the connection screw 11 respectively.

The spring washer 8 is placed between the rear end ceramic ring 12 and the top screw 10 to prevent loosening and pre-tightening; the middle of the top screw 10 is a through hole for passing through the lead 9, and the top screw is threadedly assembled on the In the inner thread section at the lower end of the large hole, the lower end of the jacking screw 10 is provided with a rectangular notch, so that the screw can be tightened with a tool, and the probe assembly 14 can be firmly fixed.

The upper end of the connection screw 11 is an external threaded joint, which is screwed into the threaded hole at the lower end of the copper connector 13. The lower end of the connection screw 11 is a tubular extension, and the connection wire 9 is clamped in the tubular extension to make it a whole. The extension part is provided with a notch; the wire 9 is a high temperature resistant glass filament mica braided copper wire, which passes through the middle through hole of the top tightening screw 10;

As shown in Figure 4, the probe head 3 can be made of graphite material. The lower end of the probe head 3 is a threaded post, which is screwed into the screw hole at the upper end of the copper connector 13. The upper end of the probe head 3 is a ball top, and the ball The top just protrudes from the top surface of the tungsten sheet 4, the top of the ball is a cylinder, and between the cylinder and the threaded column is a cylinder with flattened sides, so as to be clamped with a special fixture and tighten the thread, the size of which is larger than that of the cylinder at both ends and the threaded column diameter so as to fit closely with the front-end ceramic ring 2.

As shown in Figure 4, the probe head 3 can also be made of tungsten copper material, and its structure is basically the same as that of the graphite probe head. The top must be flat-topped cylindrical, flush with the top surface of the tungsten sheet 4 of the tungsten copper target plate, that is, the form of a flush probe, so as to avoid excessive temperature concentration caused by the protrusion of the dome and the melting of the tungsten probe head and the adhesion phenomenon ; 2) Since tungsten material cannot process threads, the threaded end of the lower end of the probe head 3 is a tungsten cylinder 17, which is welded and connected to the oxygen-free pure copper round sleeve 18 by hot pressing, etc., and then the thread is processed.

This example can be used as a component of the target plate component on a high-parameter plasma discharge device to withstand the impact of plasma, and at the same time, realize the measurement of plasma parameters.

The parts of the present invention that are not described in detail belong to the well-known techniques in the art.

Although the illustrative specific embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, As long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the inventive concept are included in the protection list.

Claims (6)

1. An integrated modular probe system suitable for a tungsten-copper target plate, characterized in that: an integrated module comprising a tungsten-copper target plate and a plurality of probe assemblies, wherein the tungsten-copper target plate includes a chromium-zirconium-copper base, a chromium There is a cavity in the zirconium-copper base, the top of the chromium-zirconium-copper base is open, and the opening is covered and connected with an oxygen-free pure copper adaptation layer and a tungsten sheet from bottom to top. The cavity of the chromium-zirconium-copper base is covered with The middle spacer is divided into two water-cooling pipes, and the rear ends of the two water-cooling pipes are connected by a connecting pipe. One of the water-cooling pipes is connected with a water inlet pipe at the front end, and the other water-cooled pipe is connected with a water outlet pipe at the front end. From the middle of the top surface of the tungsten sheet There are a plurality of probe holes vertically downward, and the plurality of probe holes are arranged along the longitudinal direction of the water-cooling pipeline. In the middle spacer, a plurality of probe assemblies are installed in the probe holes in one-to-one correspondence. The upper end of the probe assemblies is exposed from the orifice of the probe hole on the top surface of the tungsten sheet or is flush with the top surface of the tungsten sheet, and the lower end of the probe assemblies is connected There is a wire, and the wire passes through the hole of the probe hole on the bottom surface of the chrome-zirconium-copper base; The probe hole is a stepped hole with a thin top and a thick bottom, wherein the small hole is located in the tungsten sheet and the oxygen-free pure copper adaptation layer, and the large hole is located in the middle spacer of the chromium zirconium copper base; The probe assembly includes a front-end ceramic ring coaxially arranged in the upper end of the large hole, a rear-end ceramic ring coaxially arranged in the large hole and located below the front-end ceramic ring, and the ring holes of the front and rear ceramic rings are steps. Through holes, and the front ceramic ring is close to the junction of the large hole and the small hole in the stepped hole; the large hole is located between the front and rear ceramic rings coaxially with a copper connector, the copper connector is stepped cylindrical, and the copper connection The upper and lower ends of the parts are respectively assembled in the ring holes of the front ceramic ring and the rear ceramic ring, and the front and rear ceramic rings are used to fix the collimated copper connectors, and the copper connectors are insulated from the chrome zirconium copper base; The upper and lower end faces of the copper connecting piece are respectively machined with threaded holes, wherein the threaded holes at the upper end of the copper connecting piece are coaxially threaded with a probe head, and the probe head passes upward from the orifice of the probe hole on the top surface of the tungsten sheet, or The upper end of the probe head is flush with the top surface of the tungsten sheet; The probe assembly also includes a set screw coaxially arranged at the inner and lower ends of the large holes, the inner and lower ends of the large holes in the stepped holes are formed with internal threads, the top tightening screws are threadedly assembled on the inner and lower ends of the large holes, and the middle of the top tightening screws is coaxially arranged. There is a through hole, and a spring washer is arranged between the top-tightening screw and the rear-end ceramic ring in the large hole, and the spring washer is clamped by the top-tightening screw and the rear-end ceramic ring; The threaded hole at the lower end of the copper connector is coaxially threaded with a wiring screw, the lower end of the wiring screw passes through the spring washer and extends into the through hole of the jacking screw, and the lower end of the wiring screw is processed into a tubular extension, and the tubular extension is connected with a wire, The wires pass through the lower end of the through hole of the top screw and finally pass through the bottom surface of the chrome zirconium copper base. 2. The integrated modular probe system suitable for the tungsten copper target plate according to claim 1, characterized in that: the bottom surface of the top tightening screw is provided with a rectangular notch, so that a tool can be used to tighten the screw to firmly fix the probe components, after tightening the top tightening screws, do the edge punching anti-loosening treatment. 3. The integrated modular probe system that is applicable to tungsten copper target plate according to claim 1, is characterized in that: described wire is high temperature resistant glass filament mica braided copper wire. 4. The integrated modular probe system suitable for tungsten-copper target plate according to claim 1, characterized in that: the connecting pipe, the water inlet pipe and the water outlet pipe are all made of stainless steel. The corresponding ends of the water cooling pipes of the base are connected; the water inlet pipe and the water outlet pipe are respectively connected with the water cooling pipes of the external system by welding to form a water cooling loop to realize the overall cooling of the system of the present invention. 5. The integrated modular probe system suitable for a tungsten copper target plate according to claim 1, characterized in that: the probe head is made of graphite material, and the lower end of the probe head is a threaded post, and the end screw Fitted in the screw hole on the upper end of the copper connector; the top of the probe head is the top of the ball, the top of the ball protrudes from the top surface of the tungsten sheet, the bottom of the top of the ball is a cylinder, and between the cylinder and the threaded column is a cylinder with flattened sides to facilitate the use of special The clamp is clamped, and the thread is tightened, the size of which is larger than the diameter of the cylinder at both ends and the diameter of the thread cylinder, so as to be tightly attached to the front-end ceramic ring. 6. The integrated modular probe system suitable for a tungsten-copper target plate according to claim 1, wherein the probe head is prepared from tungsten-copper material, and the lower end of the probe head is a threaded post, and the end of the probe head is a threaded post. It is screwed into the screw hole on the upper end of the copper connector; the upper end of the probe head is the top of the ball, the top of the ball at the upper end of the probe head is flat-topped cylindrical, and the top of the flat top is flush with the top surface of the tungsten sheet, which constitutes a flush probe In order to avoid excessive concentration of temperature caused by the protrusion of the dome, the tungsten probe head will melt and cause adhesion. At the same time, since the tungsten material cannot process the thread, the thread end is a tungsten cylindrical surface and an oxygen-free pure copper round sleeve by hot pressing. The pipes are welded and then threaded.

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