CN209623871U - In a kind of characterization in Z opaque material shock velocity measurement target - Google Patents
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Abstract
The utility model relates to the measurement targets of shock velocity in Z opaque material in a kind of characterization, belong to material high pressure characteristics technical field, the measurement target is located at the diagnosis hole for driving black chamber, it includes ablation layer, tracer layer and sample layer, the ablation layer is towards the setting of diagnosis hole, the tracer layer is made of transparent material, the sample layer is middle Z opaque material sample layer, and sample layer is step structure, the sample layer includes the first sample layer that successively arranged side by side and thickness successively increases, second sample layer and third sample layer, compared to traditional wedge shaped sample, the utility model is designed using planar sample, easy to process and machining accuracy is high, the measurement of higher precision can be obtained, the requirement to experiment condition can be relaxed to greatest extent, both it ensure that experimental result from the same driving source, eliminate different hairs The difference that experiment condition is likely to occur between secondary, it is ensured that the consistency and reliability of data, while experimental resources have been saved again.
Description
Technical field
The utility model belongs to material high pressure characteristics technical field, relates in particular to Z opaque material in a kind of characterization
The measurement target of middle shock velocity.
Background technique
Under laboratory condition, high power laser light is widely used in material high pressure characteristics experimental study.Laser ablation sample is simultaneously
High speed impact wave, SHOCK COMPRESSION sample to high pressure status are generated in the sample.With traditional loading method, such as gas big gun phase
Than laser can be realized the load in sample more High Voltage section.
Pass through the physical quantitys such as measuring shock waves speed, combined impedance matching process quantitative Diagnosis sample compression shape in experiment
State.In view of the pressure range generated in sample can be directly associated with shock velocity, and the stability of laser-driven shock wave
It is low compared to traditional loading method, it is easy to appear the fluctuation and variation of speed.Experimentally for quantitative acquisition particular load position
Shock velocity and pressure need shock wave speed to develop and carry out quantitative evaluation.
For opaque sample, foreign countries are mainly measured and are characterized the speed stability of shock wave by wedge shaped sample at present
And history of evolution, i.e., the time of different-thickness sample is passed through using shock wave to reflect shock wave transmission feature.This technology one
Aspect relatively depends on the processing preparation precision of wedge shaped sample and experiment to set target angle, if sample angle or thickness have deviation,
Experimental result can generate biggish error and uncertainty；On the other hand, this target design is difficult to directly apply to experiment measurement,
It needs to obtain shock wave stability data first with a hair time experiment, then obtains material compression parameters state with another hair time,
There are still experiment conditions and the risks such as target parameter is inconsistent between two hairs time.
Utility model content
For various deficiencies of the prior art, it is proposed that in a kind of characterization in Z opaque material shock velocity measurement
Target, existing uncertainty is big when solving current shock velocity stability characterization, it is compatible etc. to measure with formal experiment
Problem.
To achieve the above object, the utility model provides the following technical solutions:
In a kind of characterization in Z opaque material shock velocity measurement target, be located at the diagnosis hole for driving black chamber, packet
It includes:
Ablation layer, towards the setting of diagnosis hole；
Tracer layer above ablation layer, uses transparent material to be made, and the tracer layer passes through chemical vapor deposition
Technique is grown directly upon ablation layer surface；
And the sample layer being arranged side by side above ablation layer and with tracer layer, it is middle Z opaque material sample layer,
The sample layer is connect with ablation layer by hot composition process, and sample layer is step structure, and the sample layer includes successively simultaneously
The first sample layer, the second sample layer and the third sample layer that row's setting and thickness successively increase, and the first sample layer and tracer layer
It is disposed adjacent.
Preferably, the target surface center of the measurement target is overlapped with the center in diagnosis hole, and the sample layer is towards any reflection
The setting of face velocity interferometer.
Preferably, the diagnosis hole is a along the length for the chamber axis direction for driving black chamber0, width b0, and a0>b0, institute
The length for stating ablation layer is a1, width b1, then a1=b1=a0+200μm。
Preferably, the tracer layer, the first sample layer, the second sample layer, the length of third sample layer and ablation layer length
Spend equal, and the width of tracer layer, the first sample layer, the second sample layer, third sample layer is respectively b2、b3、b4、b5, then b2+b3
+b4+b5=b1, the width-thickness ratio of the measurement target is greater than 2.
Preferably, the minimum flattened region width of the velocity interferometer default shock wave is d, then b3=
b4=d.
Preferably, target tolerance processed is set as Δ d, then d+ | Δ d |+100 μm≤b2≤d+200μm。
Preferably, the diagnosis hole length a0=700 μm, width b0=400 μm, then a1=b1=900 μm, described
The minimum flattened region width d that reflecting surface velocity interferometer of anticipating defaults shock wave is 100~120 μm, then 100 μm≤b3≤120μ
M, 100 μm≤b4≤ 120 μm, the target tolerance Δ d processed is ± 50 μm, then 250 μm≤b2≤ 320 μm, 340 μm≤b5≤450μ
M, the ablation layer is with a thickness of 30 μm, and the tracer layer is with a thickness of 100 μm, first sample layer, the second sample layer and third
The thickness of sample layer is respectively 10 μm, 20 μm and 30 μm.
Preferably, the black chamber of driving is made using Au and is in the straight tube structure of upper and lower opening, described to drive the outer of black chamber
It encloses and is provided with discoidal shielding piece at 100 μm of its upper and lower opening, the shielding piece is made of Cu, and shields piece
Surface be coated with CH layers.
Preferably, the tracer layer is CH tracer layer or Z cuts quartzy tracer layer, and the ablation layer is Al ablation layer.
In addition, the utility model also provides a kind of user of the measurement target of shock velocity in Z opaque material in characterization
Method includes the following steps:
S1: according to the size in diagnosis hole, the width and thickness of design ablation layer, tracer layer and sample layer；
S2: shock velocity evolution D of the shock wave in tracer layer is obtained using velocity interferometerch(t)、
Break through t of the shock wave in sample layerzi, the thickness of first sample layer, the second sample layer and third sample layer is denoted as
Hzi, then shock wave be in the average speed of sample layerWherein, i=1,2,3；
S3: under same time, shock wave is in the average speed of tracer layerIt obtains
Shock wave history of evolution of the sample layer within the corresponding time beWherein, i=1,2,3.
The beneficial effects of the utility model are:
1, compared to traditional wedge shaped sample, the utility model is designed using planar sample, easy to process and machining accuracy
Height, can obtain the measurement of higher precision, simultaneously as being the shock velocity history of evolution and sample layer measured in tracer layer
Break through, the required precision of the opposed target angle of this method is relatively low, can relax to greatest extent to experiment condition
It is required that.
2, the stability measurement of shock velocity can be obtained while obtaining sample compression state using same hair time,
Both it ensure that experimental result from the same driving source, eliminated the difference that experiment condition is likely to occur between different hairs time,
Ensure the consistency and reliability of data, while saving experimental resources again.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the top view of the utility model；
Fig. 3 is the structural schematic diagram for driving black chamber；
Fig. 4 is the utility model and the assembling schematic diagram for driving black chamber；
Fig. 5 is the shock velocity evolution schematic diagram in shock velocity and sample layer in tracer layer；
Fig. 6 is to be illustrated using 20km/s in Al sample layer in fluid Simulation embodiment three to 25km/s velocity variations
Figure；
Fig. 7 is to be illustrated using 25km/s in Al sample layer in fluid Simulation example IV to 32km/s velocity variations
Figure；
Fig. 8 is to be illustrated using 28km/s in Al sample layer in fluid Simulation embodiment five to 36km/s velocity variations
Figure.
In attached drawing: 1- ablation layer, 2- tracer layer, 3- sample layer, the first sample layer of 4-, the second sample layer of 5-, 6- third sample
Product layer, 7- drive black chamber, 8- shielding piece, 9- diagnosis hole, 10- laser inlet I, 11- laser inlet II, 12- to measure target.
Specific embodiment
In order to make those skilled in the art more fully understand the technical solution of the utility model, below with reference to the utility model
Attached drawing carries out clear, complete description to the technical solution of the utility model, and based on the embodiment in the application, this field is general
Logical technical staff other similar embodiments obtained without making creative work, all should belong to the application
The range of protection.In addition, the direction word mentioned in following embodiment, such as "upper" "lower" " left side " " right side " etc. are only with reference to attached drawing
Direction, therefore, the direction word used be for illustrative and not limiting the utility model create.
Embodiment one:
As shown in Figures 1 to 4, in a kind of characterization in Z opaque material shock velocity measurement target, be located at drive it is black
At the diagnosis hole 9 of chamber 7, specifically, the black use of chamber 7 Au of the driving is made and is in the straight tube structure of upper and lower opening, it is described upper and lower
Opening passes through laser inlet I 10, laser inlet II 11 respectively as laser inlet I 10, laser inlet II 11, laser
Into the X-ray radiation field for driving generation uniform high temperature in black chamber 7.The periphery of the black chamber 7 of the driving and apart from its upper and lower opening
Discoidal shielding piece 8 is provided at 100 μm, for blocking stray light, the shielding piece 8 is made of Cu, and shields piece 8
Surface be coated with CH layers.The diagnosis hole 9 is located on the side wall for driving black chamber 7, diagnoses and places measurement target 12 on hole 9, meanwhile, it surveys
The target surface center for measuring target 12 is overlapped with diagnosis 9 center of hole.
Specifically, the measurement target 12 includes ablation layer 1, tracer layer 2 and sample layer 3.The ablation layer 1 is towards diagnosis hole
9 settings, for generating ablation pressure.The tracer layer 2 is located at 1 top of ablation layer, and tracer layer 2 is made of transparent material, is shown
Track layer 2 obtains speed history of evolution of the shock wave in transparent material as reference material.Preferably, the tracer layer 2 is logical
It crosses chemical vapor deposition process and is grown directly upon 1 surface of ablation layer.The sample layer 3 be located at the top of ablation layer 1 and with tracer layer 2
It is arranged side by side, is middle Z opaque material sample layer, the sample layer 3 is arranged towards velocity interferometer.As
It is preferred that the sample layer 3 is connect with ablation layer 1 by hot composition process, to guarantee the clean property and sample purity of linkage interface.
The sample layer 3 is step structure comprising the first sample layer 4, the second sample that successively arranged side by side and thickness successively increases
Layer 5 and third sample layer 6, and the first sample layer 4 is disposed adjacent with tracer layer 2.
In view of the limitation of avris sparse transmission and diagnosis 9 size of hole, the flattened region of shock front can with when
Between reduce, that is to say, that thickness is bigger, and final available plane domain is smaller, and therefore, utility model people's design requirement measures target
12 width-thickness ratio is greater than 2.Meanwhile utility model people considers the Rethinking Catching-Up Issues of rarefaction wave or shock wave, when a certain region exists
When rarefaction wave pursues, once rarefaction wave pulls up to the shock wave of load, it is non-homogeneous to will lead to on-load pressure.
In view of above-mentioned influence factor, utility model people carries out the size of measurement target 12 following preferred:
The diagnosis hole 9 is a along the length for the chamber axis direction for driving black chamber 70, width b0, and a0>b0, the ablation
The length of layer 1 is a1, width b1, then a1=b1=a0+ 200 μm, the thickness design guarantee of ablation layer 1 is not burnt by X-ray
, meanwhile, it need to consider that factor is compared in shock wave pursuit.The tracer layer 2, the first sample layer 4, the second sample layer 5, third sample
The length of layer 6 and the equal length of ablation layer 1, and tracer layer 2, the first sample layer 4, the second sample layer 5, third sample layer 6
Width is respectively b2、b3、b4、b5, then b2+b3+b4+b5=b1.The minimum of the velocity interferometer default shock wave
Flattened region width is d, then b3=b4=d.Target tolerance processed is set as Δ d, then d+ | Δ d |+100 μm≤b2≤ d+200 μm, and
Tracer layer 2 can increase thickness under the premise of guaranteeing indeformable as far as possible, to increase experimental observation window.Based on b2、b3、b4And
b1Under the conditions of known, b can be obtained5, 2 requirement is greater than according to width-thickness ratio, the total of sample layer 3 (containing ablation layer 1) can be obtained
Thickness.
In view of the factor of target technique processed and material impedance etc., tracer layer 2 need to choose transparent material, while it is hindered
Anti- requirement and 1 material of ablation layer are close as far as possible, to weaken shock wave in the reflection of interface.From the angle of target technique processed and
Speech requires between 2 interface of ablation layer 1 and tracer layer to keep close connection, often utilizes the works such as chemical vapor deposition or heat be compound
Both skill processing interface.Ablation layer 1 is often studied using the hot composition process relative maturities such as Al or Cu and compression property more thorough
Material, in the present embodiment, the ablation layer 1 is Al ablation layer, and corresponding, the tracer layer 2 is that CH tracer layer or Z cut stone
English tracer layer.
In a kind of characterization in Z opaque material the measurement target of shock velocity application method, include the following steps:
S1: according to the size in diagnosis hole 9, the width and thickness of design ablation layer 1, tracer layer 2 and sample layer 3；
S2: shock velocity evolution D of the shock wave in tracer layer 2 is obtained using velocity interferometerch
(t), break through t of the shock wave in sample layer 3zi, the thickness of first sample layer 4, the second sample layer 5 and third sample layer 6
Degree is denoted as Hzi, then shock wave be in the average speed of sample layer 3Wherein, i=1,2,3；
S3: under same time, shock wave is in the average speed of tracer layer 2It obtains
Obtaining shock wave history of evolution of the sample layer 3 within the corresponding time isWherein, i=1,2,3.
Embodiment two:
The part that the present embodiment is the same as example 1 repeats no more, unlike:
Driving black 7 length of chamber is 2400 μm, and internal diameter is 1200 μm, and cavity wall is with a thickness of 35 μm, laser inlet I 10, laser
The diameter of inlet II 11 is 850 μm.The 9 length a of diagnosis hole0=700 μm, width b0=400 μm, then a1=b1=900
μm, the minimum flattened region width d of the velocity interferometer default shock wave is 100~120 μm, then 100 μm
≤b3≤ 120 μm, 100 μm≤b4≤ 120 μm, the target tolerance Δ d processed is ± 50 μm, then 250 μm≤b2≤ 320 μm, 340 μm
≤b5≤ 450 μm, it will lead to shock strength reduction toward the avris rarefaction wave that measurement pinwheel is propagated in the horizontal direction, produce simultaneously
The bending of raw shock front, therefore, compared to the first sample layer 4 and the second sample layer 5, third sample layer 6 and tracer layer 2
Width is somewhat larger.The ablation layer 1 with a thickness of 30 μm, the tracer layer 2 with a thickness of 100 μm (processed target techniques guarantee 100 μm),
The thickness of first sample layer 4, the second sample layer 5 and third sample layer 6 is respectively 10 μm, 20 μm and 30 μm.
Laser wavelength of incidence is 0.351 μm, total input energy 1600J, and power density is 1 × 1014W/cm2, pulse is wide
Degree is 1ns.Incident laser is 8 beams, is one group incident from laser inlet I 10, laser inlet II 11 respectively with 4 beams.It is incident
The beam center direction of laser and the chamber axis direction angle for driving black chamber 7 are 45 °, drive the radiation temperature of black chamber 7 to be about
140eV。
Shock velocity in experiment using velocity interferometer system come measuring shock waves in tracer layer 2
Develop, and the break through and average speed in conjunction with shock wave in sample layer 3 obtain sample layer (middle Z opaque material sample
Layer) in shock wave history of evolution.
Fig. 5 gives the shock velocity in tracer layer 2 and the shock velocity in sample layer 3 develops, and horizontal axis indicates
Time, the longitudinal axis indicate speed and thickness.Wherein, solid line indicates shock velocity history of evolution in tracer layer 2, and dotted line indicates to obtain
Sample layer 3 in shock velocity history of evolution, chain line represent under this speed history of evolution, shock wave sample layer 3 pass
Defeated track, triangular data points are sample layer step thicknesses (i.e. the first sample layer 4, the second sample layer 5 and the of experiment measurement
The thickness of three sample layers 6), error range is experiment uncertainty (step thicknesses ± 1 μm).From fig. 5, it can be seen that utilizing this survey
The goodness of fit is non-at the time of shock velocity evolution is pierced by different steps from the shock wave of experiment measurement in the sample layer that amount target obtains
Chang Gao illustrates that the utility model can perform well in speed history of the measuring shock waves in middle Z opaque material sample layer,
And there is quite high experimental precision.
Embodiment three:
The present embodiment part identical with embodiment two repeats no more, unlike:
Laser wavelength of incidence is 0.351 μm, total input energy 800J, and power density is 5 × 1013W/cm2, drive black chamber
7 radiation temperature is about 120eV, and sample layer 3 is Al sample layer, and tracer layer 2 is CH tracer layer.
Fig. 6, which gives, obtains in the present embodiment in Al sample layer 20km/s to 25km/s speed using fluid Simulation
Variation, horizontal axis indicate the time, and the longitudinal axis indicates speed.Wherein, triangles represent speed history of the shock wave in CH tracer layer；
Open triangles represent the speed history using the shock wave of the utility model measurement in Al sample layer；Open circles representative simulation meter
Calculate shock velocity history in the Al sample layer obtained；It is relatively inclined between hollow square representative simulation result and measurement result
Difference.From the results, it was seen that using the utility model obtain Al sample layer in shock velocity history and theory value meet compared with
Good, relative deviation characterizes to degree of precision the speed history in opaque material less than 2%.
Example IV:
The present embodiment part identical with embodiment two repeats no more, unlike: sample layer 3 is Al sample layer, tracer
Layer 2 is CH tracer layer.
Fig. 7, which gives, obtains in the present embodiment in Al sample layer 25km/s to 32km/s speed using fluid Simulation
Variation, horizontal axis indicate the time, and the longitudinal axis indicates speed.Wherein, triangles represent speed history of the shock wave in CH tracer layer；
Open triangles represent the speed history using the shock wave of the utility model measurement in Al sample layer；Open circles representative simulation meter
Calculate shock velocity history in the Al sample layer obtained；It is relatively inclined between hollow square representative simulation result and measurement result
Difference.From the results, it was seen that using the utility model obtain Al sample layer in shock velocity history and theory value meet compared with
Good, relative deviation characterizes to degree of precision the speed history in opaque material less than 2.5%.
Embodiment five:
The present embodiment part identical with embodiment two repeats no more, unlike:
Laser wavelength of incidence is 0.351 μm, total input energy 2800J, and power density is 1.75 × 1014W/cm2, driving
The radiation temperature of black chamber 7 is about 160eV, and sample layer 3 is Al sample layer, and tracer layer 2 is CH tracer layer.
Fig. 8, which gives, obtains in the present embodiment in Al sample layer 28km/s to 36km/s speed using fluid Simulation
Variation, horizontal axis indicate the time, and the longitudinal axis indicates speed.Wherein, triangles represent speed history of the shock wave in CH tracer layer；
Open triangles represent the speed history using the shock wave of the utility model measurement in Al sample layer；Open circles representative simulation meter
Calculate shock velocity history in the Al sample layer obtained；It is relatively inclined between hollow square representative simulation result and measurement result
Difference.From the results, it was seen that using the utility model obtain Al sample layer in shock velocity history and theory value meet compared with
Good, relative deviation characterizes to degree of precision the speed history in opaque material less than 1%.
The utility model is described in detail above, it is described above, only the preferred embodiment of the utility model and
, when the utility model practical range cannot be limited, i.e., all according to the made equivalent changes and modifications of the application range, it should still belong to this
In utility model covering scope.
Claims (9)
1. in a kind of characterization in Z opaque material shock velocity measurement target, be located at the diagnosis hole for driving black chamber, it is special
Sign is, comprising:
Ablation layer, towards the setting of diagnosis hole；
Tracer layer above ablation layer, uses transparent material to be made, and the tracer layer passes through chemical vapor deposition process
It is grown directly upon ablation layer surface；
And the sample layer being arranged side by side above ablation layer and with tracer layer, it is middle Z opaque material sample layer, it is described
Sample layer is connect with ablation layer by hot composition process, and sample layer is step structure, and the sample layer includes successively setting side by side
It sets and the first sample layer, the second sample layer and third sample layer that thickness successively increases, and the first sample layer is adjacent with tracer layer
Setting.
2. measurement target according to claim 1, which is characterized in that the target surface center of the measurement target and the center in diagnosis hole
It is overlapped, the sample layer is arranged towards velocity interferometer.
3. measurement target according to claim 2, which is characterized in that length of the diagnosis hole along the chamber axis direction for driving black chamber
Degree is a0, width b0, and a0>b0, the length of the ablation layer is a1, width b1, then a1=b1=a0+200μm。
4. measurement target according to claim 3, which is characterized in that the tracer layer, the first sample layer, the second sample layer,
The length of third sample layer and the equal length of ablation layer, and tracer layer, the first sample layer, the second sample layer, third sample layer
Width be respectively b2、b3、b4、b5, then b2+b3+b4+b5=b1, the width-thickness ratio of the measurement target is greater than 2.
5. measurement target according to claim 4, which is characterized in that the velocity interferometer defaults shock wave
Minimum flattened region width be d, then b3=b4=d.
6. measurement target according to claim 5, which is characterized in that set target tolerance processed as Δ d, then d+ | Δ d |+100 μm
≤b2≤d+200μm。
7. measurement target according to claim 6, which is characterized in that the diagnosis hole length a0=700 μm, width b0=
400 μm, then a1=b1=900 μm, the minimum flattened region width d of velocity interferometer default shock wave is
100~120 μm, then 100 μm≤b3≤ 120 μm, 100 μm≤b4≤ 120 μm, the target tolerance Δ d processed is ± 50 μm, then 250 μm
≤b2≤ 320 μm, 340 μm≤b5≤ 450 μm, the ablation layer is with a thickness of 30 μm, and the tracer layer is with a thickness of 100 μm, and described
The thickness of a sample layer, the second sample layer and third sample layer is respectively 10 μm, 20 μm and 30 μm.
8. according to any measurement target of claim 2-7, which is characterized in that the black chamber of driving is made and is presented using Au
The straight tube structure of under shed, the periphery of the black chamber of the driving and is provided with discoidal screen at 100 μm of its upper and lower opening
Piece is covered, the shielding piece is made of Cu, and the surface for shielding piece is coated with CH layers.
9. measurement target according to claim 8, which is characterized in that the tracer layer is that CH tracer layer or Z cut quartzy tracer
Layer, the ablation layer are Al ablation layer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945981A (en) * | 2019-04-25 | 2019-06-28 | 中国工程物理研究院激光聚变研究中心 | In a kind of characterization in Z opaque material shock velocity measurement target and method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109945981A (en) * | 2019-04-25 | 2019-06-28 | 中国工程物理研究院激光聚变研究中心 | In a kind of characterization in Z opaque material shock velocity measurement target and method |
| CN109945981B (en) * | 2019-04-25 | 2024-01-26 | 中国工程物理研究院激光聚变研究中心 | Measuring target and method for shock wave speed in Z opaque material in characterization |
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