Implementation method and platform for tens-terawatt-level multi-path pulse transmission aggregation and decomposition experiments

Abstract

The present invention provides a method and platform for implementing a multi-channel pulse transmission convergence decomposition experiment at the tens-terawatt level, which is used to solve the current technical problem of how to conduct decomposition experiments on a terawatt-level single-channel pulse power device so that it can maximize the approximation of the actual operating conditions of the vacuum convergence area of a multi-channel pulse power device at the tens-terawatt level. This method uses the magnetic insulation quality factor of the disk-cone magnetic insulation transmission line at the peak moment of the pulse voltage as a characteristic parameter to characterize its operating characteristics; uses the electric field intensity and magnetic field intensity of the cathode hole and anode column surface as characteristic parameters to characterize the operating characteristics of the column-hole convergence structure; and uses the above characteristic parameters as quantitative standards to adjust the geometric structure and parameters of the single-layer disk-cone magnetic insulation transmission line and the single-layer column-hole convergence structure on a terawatt-level single-channel pulse power device so that its operating conditions are close to the actual operating conditions of the vacuum convergence area in a multi-channel pulse power device at the tens-terawatt level.

Description

Technical Field

[0001] The present invention relates to high-power pulse technology, and in particular to a method and platform for realizing a tens-terawatt-level multi-path pulse transmission convergence and decomposition experiment. Background Art

[0002] The Z-pinch device uses an ultra-high pulse power source to generate a transient large current acting on a plasma radiation load (wire array or jet), producing extreme physical conditions such as high temperature, high pressure, and strong radiation. It has important applications in Z-pinch inertial confinement fusion, extreme conditions materials science, radiation effects science, laboratory astrophysics and other fields.

[0003] The vacuum confluence zone is an important component of the large-scale Z-pinch device. Its main function is to efficiently transmit and converge the terawatt-level electrical pulses generated by multiple primary pulse sources to the centimeter-scale physical load, including disk-cone magnetically insulated transmission lines, column-hole confluence, and internal magnetically insulated transmission lines. The central confluence zone of the large-scale Z-pinch device operates under extreme conditions, with current densities in some areas reaching MA / cm and electric power densities reaching TW / cm. 2 The magnetic field on the electrode surface reaches the order of millions of gauss (100 T). Due to mechanisms such as ohmic heating, magnetic diffusion, electrode plasma motion, anode ion flow, and X-ray irradiation, there is a significant current loss in the vacuum confluence area.

[0004] Currently, the only multi-channel parallel pulse power device with tens of terawatts built in China is the 10MA device at the China Academy of Engineering Physics, and experimental equipment is in very short supply. Building on existing domestic single-channel pulse power devices or experimental platforms at the terawatt level, conducting ultra-high current density electric pulse transmission decomposition and verifying calculation codes and design schemes are of great significance to the construction of large-scale Z-pinch devices. The core challenge facing the multi-channel pulse transmission convergence and decomposition experiment at the tens of terawatt level is the problem of experimental equivalence, that is, how to design decomposition experiments on single-channel pulse power devices with currents in the megaamperes and electrical power in the terawatts, and establish an experimental platform to maximize the approximation to the actual working conditions of the vacuum convergence area of multi-channel pulse power devices with currents in the tens of megaamperes and electrical power in the tens of terawatts. Summary of the Invention

[0005] The purpose of the present invention is to solve the current technical problem of how to carry out decomposition experiments on single-channel pulse power devices with currents in the megaampere level and electrical power in the terawatt level, so as to make it as close as possible to the actual working conditions of the vacuum convergence area of multi-channel pulse power devices with currents in the tens of megaamperes and electrical power in the tens of terawatt level. A method and platform for realizing decomposition experiments of multi-channel pulse transmission convergence in the tens of terawatt level are provided.

[0006] In order to achieve the above objectives, the technical solutions provided by the present invention are as follows:

[0007] A method for implementing a tens-of-terawatt multi-channel pulse transmission convergence and decomposition experiment is disclosed. The method is based on a terawatt single-channel pulse power device and conducts a transmission convergence and decomposition experiment of a tens-of-terawatt multi-channel pulse power device. The vacuum convergence region of the terawatt single-channel pulse power device includes a multi-layer disk-cone magnetically insulated transmission line and a double-layer column-hole convergence structure. The double-layer column-hole convergence structure includes a first cathode hole and a first anode column. The method is special in that it includes the following steps:

[0008] 1] The magnetic insulation quality factor (FOM) of the disk-cone magnetic insulation transmission line at the peak of the pulse voltage is used as the characteristic parameter to characterize the working performance of the disk-cone magnetic insulation transmission line; the electric field intensity on the cathode hole surface and the magnetic field intensity on the anode column surface are used as the characteristic parameters to characterize the working performance of the column-hole converging structure;

[0009] 2] The disc-cone magnetically insulated transmission line in the vacuum confluence region of a terawatt-class single-channel pulse power device is set to a single-layer structure to form a single-layer disc-cone magnetically insulated transmission line. The output end of the single-layer disc-cone magnetically insulated transmission line is connected to one end of a three-layer flat-plate transmission line. The other end of the three-layer flat-plate transmission line is provided with a single-layer column-hole confluence structure.

[0010] 3] By adjusting the gap distance between the cathode and anode of the single-layer disc-cone magnetic insulation transmission line, the magnetic insulation quality factor FOM of the single-layer disc-cone magnetic insulation transmission line is adjusted so that the magnetic insulation quality factor FOM of the single-layer disc-cone magnetic insulation transmission line is greater than or equal to the magnetic insulation quality factor FOM of the multi-layer disc-cone magnetic insulation transmission line at the peak of the pulse voltage;

[0011] By adjusting the diameters of the second cathode holes and the second anode columns on the single-layer column-hole confluence structure, the surface electric field strength and magnetic field strength of the second cathode holes and the second anode columns are adjusted, so that the deviation of the surface electric field strength and magnetic field strength of the second cathode holes from the surface electric field strength and magnetic field strength of the first cathode holes is less than ±5%, and the deviation of the surface electric field strength and magnetic field strength of the second anode columns from the surface electric field strength and magnetic field strength of the first anode columns is less than ±5%;

[0012] 4] Conduct decomposition experiments.

[0013] The present invention also provides a tens-terawatt-level multi-path pulse transmission convergence and decomposition experimental platform, which is used to implement the above-mentioned tens-terawatt-level multi-path pulse transmission convergence and decomposition experiment method. The special feature of the platform is that it includes a terawatt-level single-path pulse source, a coaxial output waterline, an axial insulation stack, a vacuum cavity, and a vacuum confluence area arranged in the vacuum cavity;

[0014] The output end of the terawatt-level single-channel pulse source is connected to one end of the coaxial output waterline;

[0015] The axial insulation stack is a hollow cylindrical structure, which is arranged at one end of the vacuum cavity and is used to connect the other end of the coaxial output water line and physically isolate the vacuum medium in the vacuum cavity and the deionized water medium in the coaxial output water line;

[0016] The vacuum confluence area includes a single-layer disk-cone magnetically insulated transmission line, a three-layer flat plate transmission line, a single-layer column-hole confluence structure, and a second inner magnetically insulated transmission line connected in sequence;

[0017] The single-layer disc-cone magnetically insulated transmission line is located on the vacuum side of the axially insulated stack and is electrically connected to the axially insulated stack; the magnetic insulation quality factor (FOM) of the single-layer disc-cone magnetically insulated transmission line can be adjusted by adjusting the gap distance between the cathode and the anode of the single-layer disc-cone magnetically insulated transmission line;

[0018] The three-layer planar transmission line includes a second upper ground electrode, an intermediate high-voltage electrode, and a second lower ground electrode; the intermediate high-voltage electrode is provided with a through hole for forming a second cathode hole in a single-layer column-hole busbar structure; the second anode column in the single-layer column-hole busbar structure passes through the second cathode hole and has its ends connected to the second upper ground electrode and the second lower ground electrode, respectively; the electric field intensity and magnetic field intensity on the surface of the second cathode hole, as well as the electric field intensity and magnetic field intensity on the surface of the second anode column, can be adjusted by adjusting the diameters of the second cathode hole and the second anode column;

[0019] The output end of the single-layer column-hole busbar structure is connected to one end of the second internal magnetic insulation transmission line, and the other end of the second internal magnetic insulation transmission line is used to connect to an external physical load. It is used to transmit and converge the electric pulses output by the terawatt-level single-channel pulse source through the single-layer disk-cone magnetic insulation transmission line, the three-layer flat plate transmission line and the single-layer column-hole busbar structure in the vacuum busbar area, and then transmit them to the physical load through the second internal magnetic insulation transmission line.

[0020] Furthermore, the single-layer disc-cone magnetically insulated transmission line, the three-layer flat plate transmission line and the second inner magnetically insulated transmission line are all provided with electric pulse measurement probes for monitoring voltage / current waveforms.

[0021] Furthermore, an optical observation window is provided on the vacuum cavity for introducing a time-space resolution plasma spectrum measurement system.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention provides a method for implementing a multi-channel pulse transmission convergence decomposition experiment at the tens-of-terawatt level. Characterizing the operating characteristics of the disk-cone magnetically insulated transmission line and the column-hole converging structure, the main components of the vacuum converging region, is proposed. Using these parameters as quantitative standards, a decomposition experimental platform based on a terawatt-level single-channel pulse power device is established. By adjusting the gap distance between the cathode and anode of the single-layer disk-cone magnetically insulated transmission line, as well as the diameters of the second cathode hole and second anode column in the single-layer column-hole converging structure, decomposition experiments of a multi-channel pulse power device at the tens-of-terawatt level can be conducted. This method can complete pulse transmission convergence decomposition experiments on pulse power devices with currents in the megaampere range and electrical power in the terawatt range, closely approximating the actual operating conditions of a multi-channel pulse power device at the tens-of-megaampere and electrical power range in the vacuum converging region. This method has significant application value in fields such as large-scale Z-pinch devices.

[0024] 2. The present invention provides a tens-terawatt multi-channel pulse transmission convergence and decomposition experimental platform. The platform sets the disk-cone magnetic insulation transmission line in the vacuum convergence area of the terawatt single-channel pulse power device as a single-layer disk-cone magnetic insulation transmission line, and sets the column hole convergence structure as a single-layer column hole convergence structure, so that the working performance of the single-layer disk-cone magnetic insulation transmission line and the single-layer column hole convergence structure is equivalent to or more stringent than the working performance of one layer of the multi-layer disk-cone magnetic insulation transmission line and one of the multiple double-layer column hole convergence structures in the tens-terawatt multi-channel pulse power device, so as to carry out ultra-high power electric pulse transmission and convergence decomposition experiments, and provide support for the physical design and parameter optimization of the transmission convergence system of the tens-terawatt multi-channel parallel pulse power device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of the vacuum confluence area of an existing multi-channel pulse power device at the tens of terawatt level;

[0026] Figure 2 for Figure 1 A partial enlarged view of middle B;

[0027] Figure 3 This is a schematic diagram of a longitudinal cross-section of an embodiment of a multi-channel pulse transmission, convergence and decomposition experimental platform for tens of terawatts of the present invention (the terawatt-level single-channel pulse source and coaxial output waterline are not shown);

[0028] Figure 4 for Figure 3 A partial enlarged view of middle A.

[0029] The reference numerals are as follows:

[0030] 01-Multi-layer disc-cone magnetically insulated transmission line, 011-First upper ground electrode, 012-Upper high-voltage electrode, 013-Middle ground electrode, 014-Lower high-voltage electrode, 015-First lower ground electrode, 016-First anode column, 017-First cathode hole; 02-Double-layer column-hole confluence structure; 03-First inner magnetically insulated transmission line;

[0031] 1-vacuum chamber; 2-single-layer disc-cone magnetically insulated transmission line; 3-single-layer column-hole confluence structure; 4-second internal magnetically insulated transmission line; 5-water resistance load; 6-three-layer flat-plate transmission line, 61-second upper ground electrode, 62-middle high-voltage electrode, 63-second lower ground electrode, 64-second cathode hole, 65-second anode column; 7-electric pulse measurement probe; 8-optical observation window; 9-axial insulation stack. DETAILED DESCRIPTION

[0032] In order to make the advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] In the description of the present invention, it should be noted that the terms "upper, lower, inner, and outer" and other references to orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] like Figure 1 、 Figure 2Figure 2 shows a typical schematic diagram of the vacuum manifold structure of a 10-terawatt multi-channel pulsed power device, comprising a multilayer disk-cone magnetically insulated transmission line 01, a double-layer column-hole manifold structure 02, and a first inner magnetically insulated transmission line 03. The multilayer disk-cone magnetically insulated transmission line 01 consists of four layers, including a first upper ground electrode 011, an upper high-voltage electrode 012, an intermediate ground electrode 013, a lower high-voltage electrode 014, and a first lower ground electrode 015. The double-layer column-hole manifold structure 02 consists of two layers, each containing multiple first anode columns 016 and corresponding multiple first cathode holes 017. The ends of the upper high-voltage electrode 012 and the lower high-voltage electrode 014 are respectively provided with a plurality of through holes evenly distributed around the circumference, for forming a first cathode hole 017; half of the first anode columns 016 pass through the first cathode hole 017 formed on the upper high-voltage electrode 012, connecting the first upper ground electrode 011 and the middle ground electrode 013 together to form an upper column hole confluence structure; the other half of the first anode columns 016 pass through the first cathode hole 017 formed on the lower high-voltage electrode 014, connecting the middle ground electrode 013 and the first lower ground electrode 015 together to form a lower column hole confluence structure. At a radial position with a radius of approximately 7.5 cm, the ends of the upper high-voltage electrode 012 and the lower high-voltage electrode 014 are connected together; the output section of the double-layer column hole bus structure 02 is connected to one end of the first internal magnetic insulation transmission line 03, and the other end of the first internal magnetic insulation transmission line 03 is used to connect to an external load, so that the current of the multi-layer disc cone magnetic insulation transmission line 01 is converged together through the double-layer column hole bus structure 02 and transmitted to the load through the first internal magnetic insulation transmission line 03.

[0035] The present invention provides a method for implementing a decomposition experiment of tens of terawatt-level multi-channel pulse transmission convergence. It proposes characterization parameters for the operating characteristics of the main components of the vacuum convergence area, namely the disk-cone magnetically insulated transmission line and the column-hole convergence structure. Using the characterization parameters of the operating characteristics of the disk-cone magnetically insulated transmission line and the column-hole convergence structure as quantitative standards, a decomposition experimental platform based on a terawatt-level single-channel pulse power device is established. Decomposition experiments of tens of terawatt-level multi-channel pulse power devices are conducted on the terawatt-level single-channel pulse power device, maximally approximating the actual operating conditions of the vacuum convergence area of the tens of terawatt-level multi-channel pulse power device. The method specifically includes the following steps:

[0036] 1] The magnetic insulation quality factor (FOM) of the disk-cone magnetic insulation transmission line at the peak moment of the pulse voltage is used as the characteristic parameter to characterize the working performance of the disk-cone magnetic insulation transmission line; the electric field intensity on the cathode hole surface and the magnetic field intensity on the anode column surface are used as the characteristic parameters to characterize the working performance of the column-hole converging structure.

[0037] 2] The disk-cone magnetically insulated transmission line in the vacuum confluence area of the terawatt-class single-channel pulse power device is set to a single-layer structure to form a single-layer disk-cone magnetically insulated transmission line 2. The output end of the single-layer disk-cone magnetically insulated transmission line 2 is connected to one end of the three-layer flat plate transmission line 6. The other end of the three-layer flat plate transmission line 6 is provided with a single-layer column hole confluence structure 3; the single-layer column hole confluence structure 3 includes a second cathode hole 64 and a second anode column 65.

[0038] 3. By adjusting the gap distance between the cathode and anode of a single-layer disk-cone magnetically insulated transmission line 2, the magnetic insulation quality factor (FOM) of the single-layer disk-cone magnetically insulated transmission line 2 is adjusted so that, at the peak of the pulse voltage, the magnetic insulation quality factor (FOM) of the single-layer disk-cone magnetically insulated transmission line 2 is greater than or equal to that of the multilayer disk-cone magnetically insulated transmission line 01. This means that the operating characteristics of the single-layer disk-cone magnetically insulated transmission line 2 in a terawatt-class single-channel pulse power device are superior to or equivalent to the operating characteristics of a single layer of the multilayer disk-cone magnetically insulated transmission line 01 in a tens-of-terawatt-class multi-channel pulse power device. A single layer of the multilayer disk-cone magnetically insulated transmission line 01 typically has the worst operating conditions. The specific value of the gap distance is related to the operating voltage and current of the single-layer disk-cone magnetically insulated transmission line 2.

[0039] By adjusting the diameters of the second cathode apertures 64 and the second anode pillars 65 in the single-layer post-hole busbar structure 3, the surface electric and magnetic field intensities of the second cathode apertures 64 and the second anode pillars 65 are regulated, ensuring that the deviation between the surface electric and magnetic field intensities of the second cathode apertures 64 and the first cathode apertures 017 is less than ±5%, and the deviation between the surface electric and magnetic field intensities of the second anode pillars 65 and the first anode pillars 016 is less than ±5%. This allows the operating characteristics of the single-layer post-hole busbar structure 3 in a terawatt-class single-channel pulse power device to be equivalent to the operating characteristics of one of the multiple double-layer post-hole busbar structures 02 in a multi-channel pulse power device at the tens of terawatt level. The specific diameters of the second cathode apertures 64 and the second anode pillars 65 are related to the voltage and current of the single-layer post-hole busbar structure 3.

[0040] 4] Conduct decomposition experiments.

[0041] In order to realize the above-mentioned method for realizing the multi-path pulse transmission convergence and decomposition experiment of tens of terawatts, the present invention also provides a multi-path pulse transmission convergence and decomposition experiment platform of tens of terawatts.

[0042] like Figure 3 、 Figure 4As shown, the present invention provides a tens of terawatt-level multi-channel pulse transmission convergence and decomposition experimental platform, which includes a terawatt-level single-channel pulse source, a coaxial output water line, an axial insulation stack 9, a vacuum chamber 1, and a vacuum confluence area arranged in the vacuum chamber 1. The output end of the terawatt-level single-channel pulse source is connected to one end of the coaxial output water line; the axial insulation stack 9 is a hollow cylindrical structure, which is arranged at one end of the vacuum chamber 1 and is used to connect the other end of the coaxial output water line and physically isolate the vacuum medium in the vacuum chamber 1 from the deionized water medium in the coaxial output water line. The vacuum confluence area includes a single-layer disk-cone magnetically insulated transmission line 2, a three-layer flat-plate transmission line 6, a single-layer column-hole confluence structure 3, and a second inner magnetically insulated transmission line 4 connected in sequence. The single-layer disk-cone magnetically insulated transmission line 2 is located on the vacuum side of the axial insulation stack 9, and its input end is electrically connected to the axial insulation stack 9, and its output end is connected to one end of the three-layer flat-plate transmission line 6. The single-layer column-hole bus structure 3 includes a second cathode hole 64 and a second anode column 65. The three-layer planar transmission line 6 includes a second upper ground electrode 61, an intermediate high-voltage electrode 62, and a second lower ground electrode 63. The intermediate high-voltage electrode 62 has a through-hole formed to form the second cathode hole 64 in the single-layer column-hole bus structure 3. The second anode column 65 in the single-layer column-hole bus structure 3 passes through the second cathode hole 64 and is connected at both ends to the second upper ground electrode 61 and the second lower ground electrode 63. The output end of the single-layer column-hole bus structure 3 is connected to one end of the second internal magnetic insulation transmission line 4, the other end of which is connected to an external physical load 5. The electrical pulses output by the terawatt-class single-channel pulse source are sequentially transmitted and converged through the single-layer disk-cone magnetic insulation transmission line 2, the three-layer planar transmission line 6, and the single-layer column-hole bus structure 3 in the vacuum bus region, and then transmitted to the physical load 5 through the second internal magnetic insulation transmission line 4. The present invention provides a multi-channel pulse transmission, convergence, and decomposition experimental platform capable of transmitting electrical pulses to various physical loads 5, in this embodiment, a water resistance load. The platform comprises a coaxially arranged inner and outer cylinders, wherein the inner cylinder serves as a high-voltage electrode and the outer cylinder serves as a ground electrode. Plexiglas insulating partitions are provided at both ends of the gap between the inner and outer walls of the outer cylinder. The Plexiglas insulating partitions support the inner cylinder high-voltage electrode and isolate the aqueous solution within the water resistance load from the vacuum chamber. Specifically, in this embodiment, electrical pulse measurement probes 7 are installed on the disk-cone magnetically insulated transmission line 2, the three-layer flat plate transmission line 6, and the inner magnetically insulated transmission line 4 to monitor voltage and current waveforms. Other embodiments of the present invention may also incorporate additional electrical pulse measurement probes 7 based on experimental needs. In particular, the vacuum chamber 1 of this embodiment is also equipped with an optical observation window 8 for introducing a time-space-resolved plasma spectroscopy measurement system for conducting relevant experiments.

[0043] The following specific examples verify the effects of the method for implementing a tens-terawatt-level multi-path pulse transmission convergence and decomposition experiment and the decomposition experiment platform of the present invention.

[0044] The operating characteristics of the disk-cone magnetically insulated transmission line are closely related to the electric field intensity E and the magnetic induction density B between the cathode and anode. The dimensionless characteristic parameter E / cB is used to characterize the magnetic insulation quality factor (FOM) of the disk-cone magnetically insulated transmission line. The magnetic insulation quality factor (FOM) can be expressed as:

[0045]

[0046] In formula (1), c is the speed of light in vacuum, Z r is the operating impedance of the disk-cone magnetically insulated transmission line, Z flow is the flow impedance of the disk-cone magnetically insulated transmission line.

[0047] Among them, the operating impedance Z of the disk-cone magnetically insulated transmission line is r It can be expressed as:

[0048] Z r =V a / I a (2)

[0049] The current impedance Z of the disk-cone magnetically insulated transmission line flow It can be expressed as:

[0050]

[0051] In formula (2) and formula (3), V a is the voltage between the cathode and anode of the disk-cone magnetically insulated transmission line, I a is the anode current of the disk-cone magnetically insulated transmission line, I c is the cathode current of the disk-cone magnetically insulated transmission line.

[0052] Combining formula (1), formula (2) and formula (3), it can be seen that the magnetic insulation quality factor FOM < 1.

[0053] The terawatt-class single-channel pulse power device in this embodiment features a single-channel LTD pulse source, comprising 12 LTD modules connected in series. Each LTD module includes 23 parallel main discharge branches. The single branch has an equivalent series resistance of 0.3Ω, an equivalent inductance of 200nH, and an equivalent capacitance of 50nF. The output of the single-channel LTD pulse source is connected to one end of a 1.5m coaxial output waterline, which uses deionized water as the insulating medium. The other end of the coaxial output waterline is connected to the decomposition experimental platform of the present invention.

[0054] The charging voltage of the single-channel LTD pulse source in this embodiment is ±80kV, the impedance of the water resistance load 5 is 0.05Ω, the length of the single-layer disk-cone magnetic insulation transmission line 2 is about 27cm, and the gap distance between its cathode and anode is 8mm. It is used to be equivalent to the end of one layer of the multi-layer disk-cone magnetic insulation transmission line 01 in the vacuum confluence area of a typical tens of terawatt multi-channel parallel pulse power device. The single-layer disk-cone magnetic insulation transmission line 2 of the present invention is divided into 9 sections (A) along the power transmission direction. i1 ~A i9 , each section transmission time 0.1ns), circuit simulation obtains the line voltage V of different sections of the single-layer disk-cone magnetically insulated transmission line 2 a , anode current I a , cathode current I c , operating impedance Z r , flow impedance Z flow , and then calculate A by formula (1) to formula (3) i1 ~A i9 The magnetic insulation quality factor FOM of each section is shown in Table 1. As can be seen from Table 1, when the electric pulse is transmitted from upstream to downstream, the magnetic insulation quality factor FOM of the single-layer disc-cone magnetically insulated transmission line 2 decreases from 0.538 to 0.266. The magnetic insulation quality factor of the disc-cone magnetically insulated transmission line in the vacuum confluence area of the American 15TW Z-pinch concept design device in the literature varies between 0.146 and 0.234. Therefore, the magnetic insulation quality factor FOM of the single-layer disc-cone magnetically insulated transmission line 2 of the present invention is larger. Since the smaller the magnetic insulation quality factor FOM, the better the magnetic insulation effect, it can be seen that the working conditions of the single-layer disc-cone magnetically insulated transmission line 2 in this embodiment are more stringent than the working conditions of the multi-layer disc-cone magnetically insulated transmission line 01 in the 15TWZ-pinch concept design device, and the decomposition experiment of the disc-cone magnetically insulated transmission line is established.

[0055] Table 1 Electrical parameters of the second disc-cone magnetic insulated wire of the present invention at the peak voltage moment

[0056]

[0057] In this embodiment, a single single-layer post-hole busbar structure 3 is provided, with a second cathode hole 64 having a diameter of 12 mm and a second anode column 65 having a diameter of 6 mm. This structure is designed to be equivalent to one of the multiple double-layer post-hole busbar structures 02 in the vacuum busbar region of a typical multi-channel parallel pulsed power device with a power output of tens of terawatts. The electrical parameters of the single-layer post-hole busbar structure 3 are shown in Table 2, which also provides reference parameters for double-layer post-hole busbar structures in the US Z device. It can be seen that the electrical parameters of the single-layer post-hole busbar structure 3 on the decomposition experimental platform, namely the current density near the second cathode hole 64, the electric and magnetic field strengths on the surface of the second cathode hole 64, and the electric and magnetic field strengths on the surface of the second anode column 65, are comparable to those of the US Z device with an output current of 18 mA and a power of 55 TW. This indicates that the operating characteristics of the single-layer post-hole busbar structure 3 in this embodiment are equivalent to those of a double-layer post-hole busbar structure in the US Z device. Therefore, the decomposition experiment of the post-hole busbar structure is valid.

[0058] Table 2 Comparison of electrical parameters of the single-layer column hole confluence structure of the present invention and the double-layer column hole confluence structure of the American Z device

[0059] parameter American Z device Decomposition experimental platform Current (MA) 18 ～0.75 Power (TW) 55 ～1 Number of column hole layers 2 1 Number of column holes 12 1 Cathode hole diameter (mm) 36 12 Anode rod diameter (mm) 16 6 Pillar hole voltage (MV) 2 0.75 Single column current (MA) 1.5 0.5 Current density near cathode hole (MA / cm) 0.54 0.42 Anode column surface electric field (MV / cm) 2.8 3.6 Cathode hole surface electric field (MV / cm) 1.17 1.8 Anode column surface magnetic field (T) 38 32 Cathode hole surface magnetic field (T) 15.6 15.3

[0060] The above description is only used to illustrate the technical solution of the present invention, rather than to limit it. For ordinary professional and technical personnel in this field, the specific technical solutions recorded in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution protected by the present invention.

Claims

1. A method for realizing a transmission convergence and decomposition experiment of a multi-channel pulse power device at the tens of terawatt level, based on a terawatt-level single-channel pulse power device, to carry out a transmission convergence and decomposition experiment of a multi-channel pulse power device at the tens of terawatt level; the vacuum confluence region of the multi-channel pulse power device at the tens of terawatt level comprises a multi-layer disk-cone magnetically insulated transmission line (01) and a plurality of double-layer column-hole confluence structures (02), the double-layer column-hole confluence structure (02) comprising a first cathode hole (017) and a first anode column (016), characterized in that: The following steps are involved: 1] The magnetic insulation quality factor (FOM) of the disk-cone magnetic insulation transmission line at the peak of the pulse voltage is used as the characteristic parameter to characterize the working performance of the disk-cone magnetic insulation transmission line; the electric field intensity on the cathode hole surface and the magnetic field intensity on the anode column surface are used as the characteristic parameters to characterize the working performance of the column-hole converging structure; 2] The disk-cone magnetic insulation transmission line in the vacuum confluence area of the terawatt-class single-channel pulse power device is set to a single-layer structure to form a single-layer disk-cone magnetic insulation transmission line (2), the output end of the single-layer disk-cone magnetic insulation transmission line (2) is connected to one end of a three-layer flat plate transmission line (6), and the other end of the three-layer flat plate transmission line (6) is provided with a single-layer column hole confluence structure (3); 3] Adjusting the gap distance between the cathode and the anode of the single-layer disc-cone magnetic insulation transmission line (2) so that the magnetic insulation quality factor FOM of the single-layer disc-cone magnetic insulation transmission line (2) is greater than or equal to the magnetic insulation quality factor FOM of the multi-layer disc-cone magnetic insulation transmission line (01) at the peak moment of the pulse voltage; Adjusting the diameters of the second cathode hole (64) and the second anode column (65) in the single-layer column hole confluence structure (3) so that the deviation between the surface electric field intensity and magnetic field intensity of the second cathode hole (64) and the surface electric field intensity and magnetic field intensity of the first cathode hole (017) is less than ±5%, and the deviation between the surface electric field intensity and magnetic field intensity of the second anode column (65) and the surface electric field intensity and magnetic field intensity of the first anode column (016) is less than ±5%; 4] Conduct a tens of terawatt-level multi-channel electrical pulse transmission, convergence and decomposition experiment on the terawatt-level single-channel pulse power device adjusted in steps 2 and 3.

2. A tens-terawatt-level multi-path pulse transmission convergence and decomposition experimental platform, used to implement the method for implementing the tens-terawatt-level multi-path pulse transmission convergence and decomposition experiment described in claim 1, characterized by: It comprises a terawatt-class single-channel pulse source, a coaxial output waterline, an axial insulation stack (9), a vacuum cavity (1), and a vacuum confluence area arranged in the vacuum cavity (1); The output end of the terawatt-level single-channel pulse source is connected to one end of the coaxial output waterline; The axial insulation stack (9) is a hollow columnar structure, which is arranged at one end of the vacuum cavity (1) and is used to connect the other end of the coaxial output water line and physically isolate the vacuum medium in the vacuum cavity (1) and the deionized water medium in the coaxial output water line; The vacuum confluence area comprises a single-layer disk-cone magnetically insulated transmission line (2), a three-layer flat plate transmission line (6), a single-layer column-hole confluence structure (3), and a second inner magnetically insulated transmission line (4) connected in sequence; The single-layer disc-cone magnetic insulation transmission line (2) is located on the vacuum side of the axial insulation stack (9), and its input end is electrically connected to the axial insulation stack (9), and its output end is connected to one end of the three-layer flat plate transmission line (6); The three-layer flat-plate transmission line (6) comprises a second upper ground electrode (61), an intermediate high-voltage electrode (62), and a second lower ground electrode (63); a through hole is provided on the intermediate high-voltage electrode (62) for forming a second cathode hole (64) in the single-layer column hole bus structure (3); a second anode column (65) in the single-layer column hole bus structure (3) passes through the second cathode hole (64) and has two ends connected to the second upper ground electrode (61) and the second lower ground electrode (63) respectively; The output end of the single-layer column hole confluence structure (3) is connected to one end of a second internal magnetic insulation transmission line (4), and the other end of the second internal magnetic insulation transmission line (4) is used to connect to an external physical load (5), and is used to transmit the electric pulse output by the terawatt-level single-channel pulse source through the vacuum confluence area and then transmit it to the physical load (5) through the second internal magnetic insulation transmission line (4).

3. The experimental platform for multi-channel pulse transmission, convergence and decomposition at the tens-terawatt level according to claim 2, characterized in that: The single-layer disc-cone magnetically insulated transmission line (2), the three-layer flat-plate transmission line (6), and the second inner magnetically insulated transmission line (4) are all provided with electric pulse measurement probes (7) for monitoring voltage / current waveforms.

4. The experimental platform for multi-channel pulse transmission, convergence and decomposition at the tens-terawatt level according to claim 3, characterized in that: An optical observation window (8) is provided on the vacuum cavity (1) for introducing a time-space resolution plasma spectrum measurement system.

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