CN106569012A - Z-pinch metal wire array load structure and metal wire early-stage melting corrosion phenomenon analysis method - Google Patents
Z-pinch metal wire array load structure and metal wire early-stage melting corrosion phenomenon analysis method Download PDFInfo
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- CN106569012A CN106569012A CN201610940229.2A CN201610940229A CN106569012A CN 106569012 A CN106569012 A CN 106569012A CN 201610940229 A CN201610940229 A CN 201610940229A CN 106569012 A CN106569012 A CN 106569012A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a Z-pinch metal wire array load structure and a metal wire early-stage melting corrosion phenomenon analysis method. The load structure comprises an anode, a cathode and a metal wire array. The anode is arranged opposite to the cathode; and the metal wire array is arranged between the anode and the cathode. The metal wire array comprises at least two metal wires, wherein the metal wires are arranged in parallel. The Z-pinch metal wire array load structure also comprises Rogowski coils for measuring the metal wires respectively. The metal wires are arranged in the centers of the corresponding Rogowski coils respectively. One surface, directly facing the cathode, of the anode is provided with Rogowski coil installation grooves, and the Rogowski coils are arranged in the Rogowski coil installation grooves respectively. By measuring early-stage current of each metal wire in the wire array Z-pinch process, the physical phenomenon of early-stage melting corrosion evolution of each metal wire is explained; and monitoring of the early-stage current of each metal wire can help people to know the influence of factors of materials and electrode structures and the like on early evolution as well as influence of molten corrosion plasmas on current distribution.
Description
Technical field
The present invention relates to a kind of Z constrictions wire array load structure and wire-array Z-pinch wire early stage ablate dividing for phenomenon
Analysis method.
Background technology
The research of wire array load Z constrictions makes remarkable progress in recent ten years, Sandia laboratories Z devices
On (100ns, 20MA), using Nested-wire array, (240 tungsten filaments of a diameter of 7um of outer layer constitute the silk battle array of a diameter of 2cm
Row, internal layer constitutes the silk array of a diameter of 1cm with 120 identical tungsten filaments), obtain gross energy 2MJ, radiant power 290TW
Soft X-radiation, energy conversion rate exceeded 15%.
Although the experiment of metal wire-array Z-pinch achieves the achievement more attracted attention, due to various shakinesses in implosion process
Qualitatively affect, limit the further lifting of implosion yield and efficiency.Research show the evolutionary origin of metal wire-array Z-pinch in
The core crown structure that the monofilament discharge-induced explosion stage is formed；In fusion and ablation stage, plasma is in magnetic field and the coupling of core crown structure
Cooperation is with lower further development, and whole process is closely related with load and current parameters.Therefore, the energy feedback of wire battle array early stage
Membership directly influences its follow-up ablating and develops and implosion.
It is found that the otherness that different monofilament develop in mixing wire-array Z-pinch at present, but not yet has each in analysis silk battle array
The method of monofilament behavior.
The method that Pulse Power Techniques are usually used in measuring electric current is Rogowski Coil, differential ring and current divider, wherein
Luo-coil is flexible and convenient to use, and measurement range is wider, and its principle schematic is as shown in figure 1, in addition Luo-coil can be independently of
System under test (SUT) is individually demarcated, and its sensitivity immobilizes；Differential ring is identical with Luo-coil circuit theory, and difference is that differential ring is
Single-turn circular coil, and it can not depart from system under test (SUT) and individually demarcate, and its sensitivity is relevant with installation site and use condition, needs
Strict control.
China Engineering Physics Research Institute Zhou Lin etc. is measured using miniature magnetic probe (differential ring) on " Qiangguang-I " device
Tungsten filament battle array ablates the electric current that stage inside passes through ablation plasma, but miniature probe structure easily by plasma
Affect, uncertainty of measurement is larger；
Current divider principle is simple, and it is one small resistor of series connection in tested current loop, by voltage recorded thereon
Signal deduces tested electric current.Flat being measured on " Qiangguang-I " using divertor of Xibei Nuclear Techn Inst Wang Liang is passed through
The electric current of X silks load, measurement confidence level is higher, and wherein shunt resistance adopts Ni film resistors.Limited by its space structure, nothing
Method is used for measuring flowing through each electric current wiry in silk battle array.
In the measurement of existing Z constrictions, the general total current that only monitoring passes through filament array load, and each electricity wiry in silk battle array
Flow measurement is there is not yet relevant report.
The content of the invention
In order to study the energy feed-in of wire battle array early stage to the follow-up impact for ablating evolution and implosion, the present invention is provided
A kind of Z constrictions wire early stage ablates the analysis method of phenomenon.
The present invention technical solution be：
The Z constriction wire array load structures of the present invention, including anode, negative electrode and wire battle array, the anode and negative electrode
It is oppositely arranged, the wire battle array is located between anode and negative electrode；The wire battle array includes at least two one metal wires, wire
Between be arranged in parallel；It is characterized in that：
The Z constrictions wire array load structure also includes the Luo-coil for measuring every one metal wire electric current, metal
Silk is located at the center of Luo-coil, and the just anticathode one side of the anode offers Luo-coil mounting groove, and Luo-coil is installed
In Luo-coil mounting groove；
The Z constrictions wire array load structure also includes being evenly arranged at least two eradication edge between the anode and the cathode
Support.
The quantity wiry of above-mentioned wire battle array is 2,
The method that wire ablates phenomenon analysis in early days is carried out using above-mentioned Z constriction wire array load structures,
It is characterized in that：Comprise the following steps：
1) physical parameter wiry to be analyzed is determined, the physical parameter includes material, diameter and overlay coating；
2) Luo-coil in support structures is demarcated
2.1) on-line proving is carried out to each Luo-coil, obtains respective sensitivity coefficient k；
2.2) coefficient of coup a between each Luo-coil is asked for；
3) electric current of every one metal wire is flowed through using Luo-coil measurement；
4) total current of support structures is flowed through using Luo-coil measurement
5) electric current for flowing through every one metal wire, the total current for flowing through support structures, physical parameter wiry analysis are combined
Wire ablates phenomenon.
Step 5) analysis according to being：It is of substantially equal by each electric current wiry for single silk battle array, flow through each metal
The electric current of silk develops in silk battle array and coincide substantially in early days；Flow through each electric current sum wiry to exist with the total current for flowing through support structures
Silk battle array develops and coincide very well in early days, with the increase of electric current, flows through each electric current sum wiry and flows through support structures
Total current deviate, illustrate that in silk battle array evolutionary process, with the increase of electric current, wire can ablate generation plasma, wait from
The diffusion velocity of daughter is very fast, and can distribute one part of current, so as to change the CURRENT DISTRIBUTION near wire；
For silk union battle array, flow through the results of weak current that each silk measures and then there is larger difference, flow through the big wire of electric current
Ablate soon, flow through the little wire of electric current and ablate slowly.
Compared with prior art, advantage is the present invention：
1st, the advantage of filament array load structure of the invention when being used alone can be the arteries and veins for being applied to different levels of current
Power device is rushed, is loaded by the way of insulating supporting, time and the assemble flow of filament array load making can be saved.
2nd, silk battle array can be developed using the filament array load structure of the present invention is carried out more in early days by electric current wiry
Accurately measurement, is easy to subsequently carry out the calculating of energy feed-in.
3rd, wire-array Z-pinch wire of the invention ablates in early days the analysis method of phenomenon, during to wire-array Z-pinch
The measurement of each wire early stage electric current, explains that wire early stage ablates the physical phenomenon of evolution；And the prison of wire early stage electric current
Survey can help us to recognize the factors such as material, electrode structure to the impact of evolution in early days of silk battle array and ablate plasma to electricity
The impact of flow distribution.
Description of the drawings
Fig. 1 is Luo-coil measuring principle schematic diagram；
Fig. 2 is the vacuum cavity and wire array load based on FLTD platforms；
Fig. 3 is filament array load of the present invention for wire early stage current measurement；
Fig. 4 is the connected mode of filament array load and device；
Fig. 5-1 and Fig. 5-2 is respectively the calibration result of the little Luo-coils of 2# and 3#；
Fig. 6-1 is the short-circuit waveform of experiment；
Fig. 6-2 is revised current waveform；
In Fig. 7 (1) (2) be double W silks, (3) (4) be double plated film W silks, (5) (6) for silk union battle array wire current distribute
Measured waveform, wherein the total current waveform that figure (2) (4) (6) is measured for the waveform after 2# and 3# coil additions and 1# coils.
Wherein reference is：1- anodes, 2- negative electrodes, 3- wires, 4- Luo-coils, 5- insulating supportings, 6- reflux columns,
7- device anodes, 8- device negative electrodes, 9- cone seats, 10- flanges, 11- measure the Luo-coil of total current.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
The present invention devises a kind of support structures, has made corresponding Luo-coil, measures the evolution of silk battle array and passes through in early days
Each electric current wiry.The filament array load structure of design as shown in figure 3, wherein load negative electrode and anode respectively with accelerator negative electrode
It is connected (shown in Fig. 4) with backflow column load, insulating supporting structure mainly prevents wire battle array from loosening in extracting vacuum,
Limited by locus, filament array load is made up of two one metal wires, respectively positioned at the center of two little Luo-coils.Roche line
As shown in Figure 1 principle makes circle, and coil is fixed on into position shown in Fig. 3, and coil output is located at the opposite side of anode head, Jing letters
Number resistance and coaxial cable are transferred to oscillograph.After two little Luo-coils are respectively mounted and finish, on-line proving must be respectively carried out, be obtained
To respective sensitivity coefficient k (V/A).
Because two little coil positions are nearer, during actual measurement, the magnetic field produced by the electric current of every one metal wire can be mutual
Mutually affect, make measurement result there is deviation, it is therefore desirable to be modified to measurement result.Pulse current Jing anodes, reflux column, gold
Category filament array load and connection cone seat reach negative electrode, and the Luo-coil of Fig. 4 positive plates bottom side is used for measurement and passes through whole filament array load
Total current I1.In a short-circuit situation, the addition of the little Luo-coil of two points of survey electric currents is as by total current I of load2+
I3, by the same I of total current after addition1It is compared, should meets in theory：
I1=a (I2+I3)
According to the measurement result under short circuit condition, you can obtain coefficient of coup a.
After completing the demarcation of little coil, you can develop early stage by electric current wiry for measuring silk battle array.
The support structures discharge soon linear type transformer driving source module (Fast Linear in single-stage
Transformer Driver, FLTD, shown in Fig. 2) on tested, for double W silks, double plated film W silks and W and plated film W
The silk union battle array of silk composition measures respectively early stage by each electric current wiry, obtains good practical function.
It is using the specific embodiment that above-mentioned support structures measure electric current in FLTD modules：
1., according to the reserved size of Fig. 3 coils, choosing the skeleton of Luo-coil, wire diameter carries out coil making, makes
Shown position is fixed in after finishing, signal is drawn by end in opposite side.
2., according to the parameter determination sampling resistor of Luo-coil, electric current draws the sampled resistance of signal and measurement cable connection
To on oscillograph.
3. pair two little Luo-coils carry out respectively calibration experiment (it are Fig. 4 that two little coils are respectively designated as 2# and 3#, 1#
The shown Luo-coil for measurement load total current).During calibration coil 2#, its corresponding wire is replaced by into copper rod, and
The correspondence position of coil 3 does not connect wire；During calibration coil 3#, in the same manner.In FLTD module capacitors charging ± 25kV, two little
The calibration result of Luo-coil is as shown in figure 5, respective sensitivity coefficient is respectively k2=6.45 × 10-3And k (V/A)3=9.09
×10-3(V/A)。
4. the determination of electric current correction factor：The correspondence wire of position shown in Fig. 3 is replaced by into copper rod, in short-circuit conditions
Under, as in Figure 6-1, the measurement result of 2# and 3# is of substantially equal, and revised waveform is such as the current waveform of three coil output
Shown in Fig. 6-2, correction factor a=1.33.
5th, carry out the experiment of double W silks, double plated film W silks and mixed type silk battle array respectively on FLTD, test the electric current for measuring
Waveform is as shown in Figure 7.Wherein scheme the total current ripple that (2) (4) (6) measure for the waveform after 2# and 3# coil additions and 1# coils
Shape, the two develops in silk battle array and coincide very well in early days.With the increase of electric current, wire ablates the plasma diffusion speed of generation
Degree is very fast, and defines shunting, and so as to change the CURRENT DISTRIBUTION near wire, now the measurement result of two little coils is just
With total current I1It is no longer complies with.
Experimental result finds, when filament array load is double W silks or double plated film W silks, the waveform base that Luo-coil 2# and 3# are measured
This coincide, and illustrates of substantially equal by the electric current of two one metal wires；And for silk union battle array, the result that two coils are measured is then
There is larger difference, the wire Evolution maps that this is obtained with experiment are consistent.
It should be noted that：In silk battle array evolutionary process, with the increase of electric current, wire can ablate generation plasma
Body, the diffusion velocity of plasma is very fast, and can distribute one part of current, so as to change the CURRENT DISTRIBUTION near wire, this
When two little coils measurement result just with total current I1It is no longer complies with.
Claims (4)
1. a kind of Z constrictions wire array load structure, including anode, negative electrode and wire battle array, the anode is relative with negative electrode to be set
Put, the wire battle array is located between anode and negative electrode；The wire battle array includes at least two one metal wires, puts down between wire
Row is arranged；
It is characterized in that：
The Z constrictions wire array load structure also includes the Luo-coil for measuring every one metal wire electric current, wire position
In the center of Luo-coil, the just anticathode one side of the anode offers Luo-coil mounting groove, and Luo-coil is installed on sieve
In family name's coil mounting groove；
The Z constrictions wire array load structure also includes being evenly arranged at least two eradication edge between the anode and the cathode
Support.
2. Z constrictions wire array load structure according to claim 1, it is characterised in that：The metal of the wire battle array
The quantity of silk is 2.
3. carry out wire using the Z constriction wire array load structures described in claim 1 or 2 and ablate phenomenon analysis in early days
Method,
It is characterized in that：Comprise the following steps：
1) physical parameter wiry to be analyzed is determined, the physical parameter includes material, diameter and overlay coating；
2) Luo-coil in support structures is demarcated；
2.1) on-line proving is carried out to each Luo-coil, obtains respective sensitivity coefficient k；
2.2) coefficient of coup a between each Luo-coil is asked for；
3) electric current of every one metal wire is flowed through using Luo-coil measurement；
4) total current of support structures is flowed through using Luo-coil measurement；
5) electric current for flowing through every one metal wire, the total current for flowing through support structures, physical parameter wiry analysis metal are combined
Silk ablates phenomenon.
4. the side that wire ablates in early days phenomenon analysis is carried out using the Z constriction wire array load structures described in claim 3
Method, it is characterised in that：
Step 5) analysis according to being：
It is of substantially equal by each electric current wiry for single silk battle array, flow through each electric current wiry and develop early stage in silk battle array
Substantially it coincide；Flow through each electric current sum wiry and coincide very in silk battle array evolution early stage with the total current for flowing through support structures
It is good, with the increase of electric current, flow through each electric current sum wiry and deviate with the total current for flowing through support structures, illustrate in silk battle array
In evolutionary process, with the increase of electric current, wire can ablate generation plasma, and the diffusion velocity of plasma is very fast, and
One part of current can be distributed, so as to change the CURRENT DISTRIBUTION near wire；
For silk union battle array, flow through the results of weak current that each silk measures and then there is larger difference, flow through the big wire of electric current and ablate
Hurry up, flow through the little wire of electric current and ablate slowly.
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Cited By (4)
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| CN108513422A (en) * | 2018-05-22 | 2018-09-07 | 西北核技术研究所 | A kind of two level filament array load for the experiment of Z constrictions |
| CN108601197A (en) * | 2018-05-22 | 2018-09-28 | 西北核技术研究所 | The regulation and control method of wire battle array early stage physical state under a kind of megampere of grade electric current |
| CN108934119A (en) * | 2018-07-03 | 2018-12-04 | 西安交通大学 | A kind of metal vapors Z pinch load device and regulation method based on silk battle array |
| CN114158173A (en) * | 2021-11-30 | 2022-03-08 | 西北核技术研究所 | Wire array load structure for restraining prepulse current |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108513422A (en) * | 2018-05-22 | 2018-09-07 | 西北核技术研究所 | A kind of two level filament array load for the experiment of Z constrictions |
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| CN114158173B (en) * | 2021-11-30 | 2023-09-01 | 西北核技术研究所 | Silk array load structure for inhibiting pre-pulse current |
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