CN115051690A - Dozens of megaamperes FLTD driving source based on shared cavity - Google Patents
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Abstract
The invention relates to a linear transformer driving source, in particular to a dozen of megaamperes FLTD driving source based on a common cavity, which is used for solving the defects that each stage of the existing FLTD induction cavity adopts an independent sealed cavity structure, FLTD charging, triggering and gas circuits cannot be shared, 2-4 external triggering and 1 group of plus-minus 100kV high-voltage charging cables are required to be introduced into each stage, the number of FLTD charging and triggering cables is large, the requirement on a triggering system is high, and the maintenance and replacement of primary parts of the FLTD are inconvenient. According to the dozen-megaampere FLTD driving source based on the common cavity, a plurality of parallel FLTD groups are arranged in a common annular cavity, each FLTD group comprises a plurality of series FLTD units, each FLTD unit adopts separated conductor excitation backflow, each branch circuit shares a charging power supply, the charging voltage is the same, the number of charging cables of the FLTD driving source is reduced, in-situ maintenance and replacement of primary fault parts are facilitated, and the maintainability of the large FLTD driving source is remarkably improved.
Description
Technical Field
The invention relates to a linear transformer driving source, in particular to a dozen megaampere FLTD driving source based on a shared cavity.
Background
A linear transformer driving source based on the traditional technology of water medium capacitor energy storage and multi-stage pulse compression, such as an American SNL 26MA ZR device, has limited service life (the storage switch in ZR6MV/800kA has only one hundred times of service life) due to high working voltage and large conduction current of a pulse switch, and further has great difficulty in improving the current. The Russian high-current initiates an FLTD (fast discharge linear transformer) technology and successfully develops a 1MA FLTD module, the FLTD is essentially an induced voltage adder (IVA for short) with energy storage and pulse forming components such as a capacitor and a switch positioned in an induction cavity, the FLTD is recognized as the next generation pulse driving source technology with the most development prospect at home and abroad, and various Z pinch ICF/IFE driving source concept designs with the current of more than 60MA and the leading edge of 100-200 ns are provided at home and abroad. The fast discharge branch is the basis of FLTD, directly determines the scale, size and cost of large FLTD pulse power source, in recent years, due to the progress of capacitor and switching technology, the single branch power is increased from 2.5GW of 1MA module of HCEI to 5GW, based on 5GW branch, 2015 for 11 months, Stygar of national laboratory of Saint Asia (SNL) in USA and the like, 2 Pawa (10 Pa W) for high energy density physical experiment are proposed 15 W) stage FLTD drive source concept designs Z300 and Z800.
Z300 diameter phi 35m, energy storage 48MJ, current 48MA of driving a magnetized sleeve fusion target (MagLIF for short), leading edge 154ns, electric power 870TW, and the aim is to realize fusion ignition, namely the fusion yield is larger than the energy transmitted to the sleeve by a driving source. Z300 is arranged in three layers of axisymmetric mode, 90 FLTD ways are connected in parallel, each way is connected in series with 33 levels, the diameter phi 2m and the height 22cm of a single-stage module are formed by 20 5GW branches, and 2970 modules and 59400 branches are needed. Z800 diameter Φ 52m, stored energy 130MJ, driven MagLIF current 65MA, leading edge 113ns, power 2500TW, with the goal of achieving high yield fusion (7GJ), i.e., fusion yield greater than the drive source stored energy. Z800 is also arranged in an axial symmetry mode, the upper layer and the lower layer are connected in parallel by 90 FLTD channels, each FLTD channel is connected in series by 60 stages, the diameter phi of each FLTD channel is 2.5m, each FLTD channel consists of 30 5GW branches, and the FLTD channels consist of 5400 modules and 162000 branches. The secondary Z300 and the secondary Z800FLTD both adopt an impedance-matched aqueous medium transmission line, and the current is converged and transmitted to the insulation stack through a three-layer three-plate integral radial aqueous medium variable-impedance transmission line.
Compared with the 210-path FLTD driving source scheme proposed by Stygar in 2007, the Z800 scheme adopts a 5GW branch instead of a 2.5GW branch, the driving source diameter is reduced from phi 104m to three layers of 210 paths (each path is connected with 1MA modules with the diameter of 3m in series), and is reduced to 54m in diameter and three layers of 90 paths (each path is connected with 2.5m in series), the output current and the pulse leading edge are basically the same in the two conceptual designs, but the device diameter and the module number are greatly reduced by Z800.
Although the FLTD technology has made remarkable progress in the last two decades and is considered to be the most important progress in the technical field of pulse power since the invention of the Marx generator in 1924, a large FLTD driving source with the current of more than 10MA has not been built at home and abroad so far, and at present, the FLTD driving source with hundreds TW levels at home and abroad is in the conceptual design stage. At present, each stage of an existing FLTD induction cavity at home and abroad adopts an independent sealed cavity structure, FLTD charging, triggering and gas circuits cannot be shared, and each stage needs to introduce 2-4 paths of external triggering and 1 group of positive and negative 100kV high-voltage charging cables, so that the number of FLTD charging and triggering cables is large, and the requirement on a triggering system is high; each stage adopts an independent closed cavity, so that the maintenance and replacement of primary parts of the FLTD are inconvenient, and the application and development of a large FLTD driving source are restricted by the difficult problems.
Disclosure of Invention
The invention aims to solve the problems that each stage of the existing FLTD induction cavity adopts an independent sealed cavity structure, FLTD charging, triggering and gas circuits cannot be shared, each stage needs to introduce 2-4 external triggering and 1 group of positive and negative 100kV high-voltage charging cables, the number of FLTD charging and triggering cables is large, the requirement on a triggering system is high, and the maintenance and replacement of primary parts of the FLTD are inconvenient, and provides a dozen megaampere FLTD driving source based on a shared cavity.
In order to solve the defects existing in the prior art, the invention provides the following technical solutions:
a dozens of megaamperes FLTD driving source based on sharing cavity, its special character lies in: the device comprises an outer cylindrical shell and an inner cylindrical shell which are coaxially arranged and sealed, wherein an annular cavity is formed between the outer cylindrical shell and the inner cylindrical shell, a primary medium and m x n FLTD groups which are connected in parallel are arranged in the annular cavity, the m x n FLTD groups which are connected in parallel comprise n FLTD layers which are axially arranged, each FLTD layer comprises m FLTD groups which are connected in parallel, and each FLTD group comprises p FLTD units which are connected in series; m, n and p are positive integers more than or equal to 1;
the inner cylindrical shell is internally provided with a coaxial variable impedance transmission line, an integral variable impedance water-resistant medium transmission line, a high-voltage insulation stack, an outer magnetic insulation transmission line, a multi-layer cylindrical hole converging structure, an inner magnetic insulation transmission line and a Z pinch load which correspond to each FLTD group in sequence from outside to inside along the radial direction; each secondary pulse of the FLTD group is transmitted to a Z pinch load arranged at the axis center of the inner cylindrical shell body sequentially through a corresponding coaxial variable impedance transmission line, an integral radial water medium transmission line, a high-voltage insulation stack, an outer magnetic insulation transmission line, a multi-layer cylindrical hole converging structure and an inner magnetic insulation transmission line;
each FLTD unit comprises q branch circuits and q discrete conductor columns which are sequentially arranged from inside to outside along the radial direction and connected in parallel; the q branch circuits and the q discrete conductor columns are respectively and coaxially and uniformly distributed on different circumferences between the upper plate and the lower plate; the q branches comprise a trigger branch and q-1 main discharging branches, the q branches share a charging power supply, the charging voltage is the same, and the branches are isolated by adopting resistors; q is a positive integer greater than or equal to 2; the q branches are grounded through discrete conductor columns.
Further, each FLTD group comprises a serial FLTD groups and corresponding intra-group high-voltage delay transmission lines, and each FLTD group comprises x FLTD units in series; a. x is a positive integer greater than or equal to 1;
the high-voltage delay transmission line in the FLTD grouping is sequentially and uniformly provided with x connecting points from the head end to the tail end, and the x connecting points are respectively connected with the gas switches of the trigger branches through isolation resistors;
when a is 1, the head end of the high-voltage delay transmission line in the first FLTD packet is used for being connected with an external trigger power supply;
when a is more than 1, the head end of a high-voltage delay transmission line in a group of the first FLTD group is used for being connected with an external trigger power supply, the output end of a first trigger branch in the b-th FLTD group is connected with the head end of a high-voltage delay transmission line in a group of the b + 1-th FLTD group through a high-voltage delay transmission line between groups, and b is more than or equal to 1 and less than or equal to a-1;
the FLTD units of each FLTD group are triggered according to an ideal time sequence.
Further, the outer magnetic insulation transmission line is gradually reduced along the radial radius of the inner cylindrical shell from outside to inside, so that the output electric power of each FLTD group is maximized.
Further, the electrical length of the high-voltage delay transmission line in the group between two adjacent FLTD units is the same as the electrical length of the secondary electric pulse transmission of each FLTD unit.
Furthermore, m FLTD groups of each FLTD layer are uniformly distributed in the annular cavity along the circumference, and the inner diameter R of the annular cavity in ≥(m·D FLTD ) /2 pi, outer diameter of annular cavity R out ＝R in +l FLTD The height H of the annular cavity is more than or equal to n.D FLTD (ii) a Wherein D FLTD Is the diameter of a FLTD group induction cavity l FLTD Is the length of one FLTD group along the radial direction of the outer cylindrical shell.
Furthermore, all FLTD groups of two adjacent FLTD layers are distributed in a staggered mode in the circumferential direction, and maintenance is facilitated.
Furthermore, the q discrete conductor columns are located on a central line of an included angle between adjacent branch circuits, the q branch circuits adopt a plug-in structure, fault parts or devices are easy to diagnose, in-situ field replacement can be achieved, and the maintainability of the large FLTD driving source is obviously improved.
Further, the gas switch of the triggering branch can be independently inflated, and the gas switches of the q-1 main discharging branches share an inflation and deflation system.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention relates to a dozen of megaampere FLTD driving source based on a shared cavity, which arranges a plurality of FLTD groups in parallel in a shared annular cavity, each FLTD group comprises a plurality of FLTD units which are connected in series, each FLTD unit adopts separated conductor excitation reflux, each branch circuit shares a charging power supply, the charging voltage is the same, the number of charging cables of the FLTD driving source is reduced, in-situ maintenance on site is convenient for replacing primary fault parts, and the maintainability of the large FLTD driving source is obviously improved.
(2) In the dozen-megaampere FLTD driving source based on the common cavity, each FLTD group comprises a plurality of FLTD groups connected in series, each FLTD group only needs to introduce 1-path external trigger pulse, and the sequential triggering of all FLTD units in the group is realized by the combination of high-voltage delay transmission lines in the groups and high-voltage delay transmission lines among the groups, so that the number of cables for external trigger pulses of the FLTD driving source is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an FLTD drive source of several tens of megaamperes based on a common cavity according to the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic diagram of the structure of one FLTD unit (excluding the upper plate) in the embodiment of FIG. 1;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic diagram of the structure of two FLTD packets connected in series in the embodiment of FIG. 1;
FIG. 6 is a schematic diagram of the structure of one FLTD bank in the embodiment of FIG. 1;
FIG. 7 is a simplified equivalent circuit diagram of the embodiment of FIG. 1;
FIG. 8 is a simulation diagram of the Z-pinch load equivalent circuit of the embodiment of FIG. 1;
FIG. 9 is a simulation diagram of the PSPICE analog circuit of the embodiment of FIG. 1;
FIG. 10 is a graph of current waveforms at the high voltage insulation stack and Z-pinch load simulated for the embodiment of FIG. 1;
FIG. 11 is a graph of power waveforms of the FLTD drive source output position, the high voltage insulation stack, and the Z pinch load obtained from the simulation of the embodiment of FIG. 1.
The reference numerals are explained below: 1-an outer cylindrical shell; 2-inner cylindrical shell; 3-FLTD group, 31-FLTD group, 311-FLTD unit, 3111-upper plate, 3112-lower plate, 3113-discrete conductor post, 312-intra-group high voltage delay transmission line, 313-inter-group high voltage delay transmission line; 4-a coaxial variable impedance transmission line; 5-integral varistor water-resistant medium transmission line; 6-high voltage insulation stack; 7-external magnetically insulated transmission line.
Detailed Description
The invention will be further described with reference to the drawings and exemplary embodiments.
Referring to fig. 1 to 4, a common cavity based several tens of megaamperes FLTD drive source comprises an outer cylindrical shell 1 and an inner cylindrical shell 2 which are coaxially arranged and sealed, an annular cavity is formed between the outer cylindrical shell 1 and the inner cylindrical shell 2, a primary medium and m × n parallel FLTD groups 3 are arranged in the annular cavity, the m × n parallel FLTD groups 3 comprise n axially arranged FLTD layers, each FLTD layer comprises m parallel FLTD groups 3, and each FLTD group 3 comprises p serial FLTD units 311; the FLTD groups 3 of two adjacent FLTD layers are distributed in a staggered mode in the circumferential direction. In the present embodiment, n is 2, m is 24, p is 32, and the FLTD groups 3 of the two FLTD layers are distributed with an interlace of 7.5 °.
Inner diameter R of annular cavity in ＝(m·D FLTD ) /2 pi, outer diameter of annular cavity R out ＝R in +l FLTD The height H of the annular cavity is more than or equal to n.D FLTD (ii) a Wherein D FLTD The diameter of the induction cavity is equal to 2.3m, l for one FLTD group 3 FLTD Is the axial length of one FLTD group 3, equal to 10 m.
In this embodiment, the diameter of the outer cylindrical housing 1 is 43.6m, the diameter of the inner cylindrical housing 2 is 23.4m, and the overall diameter and height of the FLTD drive source are about 43.6m and about 6m, respectively.
A coaxial variable impedance transmission line 4, an integral variable impedance water-resistant medium transmission line 5, a high-voltage insulation stack 6, an external magnetic insulation transmission line 7, a multi-layer column hole converging structure, an internal magnetic insulation transmission line and a Z pinch load which correspond to each FLTD group 3 are sequentially arranged in the inner cylindrical shell 2 from outside to inside along the radial direction; the secondary pulse of each FLTD group 3 is transmitted to a Z pinch load arranged at the axis of the inner cylindrical shell 2 through a corresponding coaxial variable impedance transmission line 4, an integral radial water medium transmission line, a high-voltage insulation stack 6 and an outer magnetic insulation transmission line 7 in sequence; the radial radius of the outer magnetic insulation transmission line 7 from outside to inside along the inner cylindrical shell 2 is gradually reduced, the maximum radius is 160cm, and the minimum radius is 32 cm.
Each FLTD unit 311 comprises q branches and q discrete conductor columns 3113 arranged in sequence from inside to outside along a radial direction; the q branches and q discrete conductor columns 3113 are coaxially and uniformly distributed on different circumferences between the upper plate 3111 and the lower plate 3112, respectively; the q branches comprise a trigger branch and q-1 main discharging branches, the q branches share a charging power supply, the charging voltage is the same, and the branches are isolated by adopting resistors. In this embodiment, q is 24.
In the embodiment, the main discharging branch consists of two plastic shell capacitors (with width of 154mm, thickness of 105mm and length of 245mm) with two ends outgoing lines of 100nF/100kV and a high-pressure field distortion gas switch, and the inductance of the equivalent loop of the main discharging branch is about 160 nH; the trigger branch circuit consists of two double-end outgoing line 50nF/100kV plastic shell capacitors (154 mm in width, 105mm in thickness and 150mm in length) and a low-threshold trigger gas switch, and the trigger voltage amplitude is about 70 kV. The trigger branch circuit and the main discharge branch circuit have the same capacitor charging voltage, but the gas switches of all the trigger branch circuits can be independently charged. The magnetic core is made of 2605SA1 amorphous strips with the thickness of 25 mu m, silicate coatings are coated among the layers, the whole magnetic core is subjected to thermomagnetic treatment after winding, the inner diameter phi of the magnetic core is 98cm, the outer diameter phi of the magnetic core is 118cm, the height is 2cm, 2 magnetic cores are only packaged into 1 magnetic ring by epoxy resin boxes, 4 magnetic rings are adopted in a single stage, the volt-second number is about 34mVs, and the equivalent loss resistance of the magnetic core is about 45 omega.
Referring to fig. 5, 6, each of the FLTD groups 3 includes a serial FLTD groups 31, and each FLTD group 31 includes x FLTD units 311 in serial; the high-voltage delay transmission line 312 in the FLTD packet 31 is uniformly provided with x connection points in sequence from the head end to the tail end, and the x connection points are respectively connected with the gas switches of the trigger branches through isolation resistors; the head end of the high-voltage delay transmission line 312 in the first FLTD packet 31 is connected with an external trigger power supply; the output end of the first trigger branch of the b-th FLTD packet 31 is connected with the intra-packet high-voltage delay transmission line 312 of the b + 1-th FLTD packet through a sub-packet high-voltage delay transmission line 313, and b is more than or equal to 1 and less than or equal to a-1. In this embodiment, a is 8 and x is 4.
Triggering pulses needed by each triggering branch of the first FLTD group 31 are introduced to a gas switch of each triggering branch through an impedance-100 omega group internal high-voltage delay transmission line 312 from 1 external triggering pulse, and are respectively introduced to the gas switch of each triggering branch through a 300-500 omega isolation resistor, meanwhile, the triggering pulses of the first triggering branch of the b-th FLTD group 31 sequentially pass through the inter-group high-voltage delay transmission line 313, the intra-group high-voltage delay transmission line 312 and the 300-500 omega isolation resistor and are input into each triggering branch of the b + 1-th FLTD group 31, and triggering of each FLTD unit 311 of each FLTD group 3 according to an ideal time sequence is realized.
Each FLTD group 3 connected in parallel in the FLTD driving source sequentially passes through a coaxial variable impedance transmission line 4 with the length of 7m, an integral variable resistance water-resistant medium transmission line 5 with the diameter of about 5.2m, a high-voltage insulation stack 6, an external magnetic insulation transmission line 7, a multilayer cylindrical hole converging structure and an internal magnetic insulation transmission line to transmit converged dozens of MA current and voltage MV ultrahigh-power pulses to a Z-pinch load to be driven, wherein the Z-pinch load is arranged at the axis of the inner cylindrical shell 2.
The following is assumed before the FLTD drive source is subjected to analog calculation: 1) the number of branches and the electrical parameters of each FLTD unit 311 are the same; 2) all branch switches of each FLTD unit 311 are triggered to close simultaneously; 3) triggering and overlapping each FLTD group 3 according to an ideal IVA time sequence; 4) a plurality of parallel FLTD groups 3 are triggered synchronously, and the FLTD drive source can be simplified to the circuit model shown in fig. 7.
Total equivalent capacitance C of FLTD drive source in FIG. 7 s Equivalent inductance L s Equivalent resistance R s Equivalent charging voltage V s Respectively as follows:
V s ＝n c V b
n t ＝m·n c ·n b
in the formula, the single-branch inductor, the capacitor, the equivalent series resistor and the equivalent charging voltage are respectively as follows: l is b ＝200nH，C b ＝50nF，Rb＝0.3Ω，V b ＝160kV；
n t -total number of branches; n is c -number of FLTD units 311 in each FLTD group 3; n is b -number of parallel branches per FLTD cell 311;
inductance of the center area: l is center ＝L stack +L MITL +L con +L inner +L load ；
L stack Is a high voltage insulation stack 6 inductor, L MITL For magnetically insulating transmission line inductance, L con An inductor with a multilayer cylindrical hole convergence structure, L inner Is an inductance of an internal magnetically insulated transmission line, L load A Z-pinch load inductor;
the inductance of the center area is the core parameter of the FLTD drive source, and the adopted insulation stack-magnetic insulation transmission line-load structure, L center Chosen to be 18 nH.
To maximize the output power of each FLTD bank, the output impedance Z of each FLTD bank opt Comprises the following steps:
coaxial variable impedance transmission line 4 input impedance Z in Equal to the output impedance of the corresponding FLTD bank, i.e. Z in ＝Z opt 。
Core bypass leakage equivalent resistance:
R cav.loss (abbreviation R) c ) For each FLTD cell 311 core equivalent loss resistance, the effect of the excited magnetic pulse equivalent frequency ω is given by the formula:
estimating;
where ρ is the resistivity of the core material, S 0 Is the effective sectional area of the magnetic core; amorphous ribbon rho core ＝1.23×10 -6 [Ω.m](ii) a Delta is the thickness of the magnetic core strip, 25 mu m; l c Is the average ring length of the core; k is a dimensionless coefficient, and is generally 8-12.
The loss current of the magnetic insulation transmission line is replaced by a resistor connected with the Z-pinch load in parallel, and the magnetic insulation transmission line comprises an outer magnetic insulation transmission line 7 and an inner magnetic insulation transmission line;
in the formula (I), the compound is shown in the specification,
Z sin gleMITL ＝5Ω；
Z flow for loss of current equivalent impedance, Z MITLs For parallel impedance of multi-layer magnetically insulated transmission lines, Z singleMITL Is a single-layer magnetic insulation transmission line impedance; n is MITL The number of the magnetic insulation transmission lines is parallel;
R inner and 10m omega is the pinch load equivalent series resistance at the stagnation moment Z.
The Z-pinch filament array is approximated by a zero-dimensional model, and the dynamic inductance of a plasma shell and the Z-pinch load implosion motion equation are respectively expressed as follows
μ 0 Is vacuum magnetic conductance, l is filament array height, m is filament array mass, r 0 Is the initial radius of the filament array, and r (t) is the radius of the filament array changing along with time; i (t) is a current value that varies with time;
using the PSPICE circuit simulation program, the Z-pinch load equivalent circuit is shown in fig. 8 and the FLTD drive source equivalent circuit is shown in fig. 9.
Assuming that the filament array height is 1cm, the radius is 20mm, and the unit length mass is 15mg, the current waveforms of the high-voltage insulation stack 6 and the Z pinch load obtained by circuit simulation are shown in fig. 10, and the power waveforms of the FLTD drive source output position, the high-voltage insulation stack 6 and the Z pinch load are shown in fig. 11.
The comparison between typical output parameters of the FLTD drive source and ZR in the embodiment is shown in Table 1:
TABLE 1
| Parameter(s) | This example | ZR |
| Device diameter/m | 44 | 33 |
| Primary energy storage/MJ | 22.6 (charging 80kV) | 22 |
| Primary power source output voltage/MV | 2.9 | 5.1 |
| Variable impedance waterline entrance impedance/omega | 0.07 | 0.12 |
| Variable impedance waterline exit impedance/omega | 0.16 | 0.12 |
| Insulation Stack (VIS) Peak Voltage/MV | 4.5 | 4 |
| Electric power/TW at high voltage insulation stack | 96.5 | 85 |
| High voltage insulation stack outer radius/m | 1.68 | 1.68 |
| Inductance in center area/nH | 18+5 | 13+4.5 |
| Current/MA at high |
35 | 26(32) |
| Z pinch load current/ |
31 | 24(29) |
| Current front (10% -90%)/ns | 120 | 80 |
| Current obtained from unit energy storage (MA/MJ) | 1.59 | 1.18 |
The characteristics of the FLTD drive source of this embodiment are compared with those of Z300 in table 2:
TABLE 2
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (8)
1. A tens of megaamperes FLTD driving source based on sharing cavity, its characterized in that: the device comprises an outer cylindrical shell (1) and an inner cylindrical shell (2) which are coaxially arranged and sealed, wherein an annular cavity is formed between the outer cylindrical shell (1) and the inner cylindrical shell (2), a primary medium and m x n FLTD groups (3) which are connected in parallel are arranged in the annular cavity, the m x n FLTD groups (3) which are connected in parallel comprise n FLTD layers which are axially arranged, each FLTD layer comprises m FLTD groups (3) which are connected in parallel, and each FLTD group (3) comprises p FLTD units (311) which are connected in series; m, n and p are positive integers more than or equal to 1;
the coaxial variable impedance transmission line (4) corresponding to each FLTD group (3), an integral variable resistance water-resistant medium transmission line (5), a high-voltage insulation stack (6), an external magnetic insulation transmission line (7), a multilayer column hole convergence structure, an internal magnetic insulation transmission line and a Z pinch load are sequentially arranged in the inner cylindrical shell (2) from outside to inside along the radial direction; the secondary pulse of each FLTD group (3) is transmitted to a Z pinch load arranged at the axis of the inner cylindrical shell (2) through a corresponding coaxial variable impedance transmission line (4), an integral radial water medium transmission line, a high-voltage insulation stack (6), an outer magnetic insulation transmission line (7), a multi-layer cylindrical hole converging structure and an inner magnetic insulation transmission line in sequence;
each FLTD unit (311) comprises q branches and q discrete conductor columns (3113) which are arranged in parallel and are arranged in turn from inside to outside along the radial direction; the q branches and the q discrete conductor columns (3113) are coaxially and uniformly distributed on different circumferences between the upper plate (3111) and the lower plate (3112) respectively; the q branches comprise a trigger branch and q-1 main discharging branches, the q branches share a charging power supply, the charging voltage is the same, and the branches are isolated by adopting resistors; q is a positive integer greater than or equal to 2; the q branches are grounded through discrete conductor columns (3113).
2. The FLTD drive source of tens of megaamperes based on a common cavity according to claim 1, wherein: each FLTD group (3) comprises a serial FLTD groups (31) and a corresponding intra-group high-voltage time delay transmission line (312), and each FLTD group (31) comprises x FLTD units (311) in series; a. x is a positive integer greater than or equal to 1;
the high-voltage delay transmission line (312) in the FLTD group (31) is sequentially and uniformly provided with x connection points from the head end to the tail end, and the x connection points are respectively connected with the gas switches of the trigger branches through isolation resistors;
when a is 1, the head end of a high-voltage delay transmission line (312) in the first FLTD packet (31) is used for being connected with an external trigger power supply;
when a is larger than 1, the head end of the intra-packet high-voltage delay transmission line (312) of the first FLTD packet (31) is used for being connected with an external trigger power supply, the output end of the first trigger branch in the b-th FLTD packet (31) is connected with the head end of the intra-packet high-voltage delay transmission line (312) of the b + 1-th FLTD packet (31) through the inter-packet high-voltage delay transmission line (313), and b is larger than or equal to 1 and smaller than or equal to a-1.
3. The FLTD drive source of tens of megaamperes based on a common cavity according to claim 2, wherein: the radius of the external magnetic insulation transmission line (7) is gradually reduced from outside to inside along the radial direction of the inner cylindrical shell (2).
4. An FLTD drive source of tens of megaamperes based on a common cavity, according to claim 3, characterized in that: the electrical length of the high-voltage delay transmission line (312) in the group between two adjacent FLTD units (311) is the same as the electrical length of the secondary electric pulse transmission of each FLTD unit (311).
5. An FLTD drive source of tens of megaamperes based on a common cavity, according to claim 4, wherein: m FLTD groups (3) of each FLTD layer are uniformly distributed in the annular cavity along the circumference, and the inner diameter R of the annular cavity in ≥(m·D FLTD ) /2 pi, outer diameter of annular cavity R out ＝R in +l FLTD The height H of the annular cavity is more than or equal to nD FLTD (ii) a Wherein D FLTD Is the diameter of the induction cavity of one FLTD group (3) | FLTD Is the length of an FLTD group (3) along the radial direction of an outer cylindrical shell (1).
6. A common cavity based tens of Mega-Amp FLTD drive source according to any of claims 1 to 5, wherein: the FLTD groups (3) of two adjacent FLTD layers are distributed in a staggered mode in the circumferential direction.
7. An FLTD drive source of tens of megaamperes based on a common cavity, according to claim 6, wherein: the q discrete conductor columns (3113) are located on a central line of an included angle between adjacent branches, and the q branches are of a plug-in structure.
8. The FLTD drive source of tens of megaamperes based on a common cavity according to claim 7, wherein: the gas switch of the triggering branch circuit can be independently inflated, and the gas switches of the q-1 main discharging branch circuits share an inflation and deflation system.
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