Method for preparing multi-layer modulated structure fusion modulation target

Abstract

The present invention provides a method for preparing a multi-layer modulated structure fusion modulation target, comprising: establishing a three-dimensional model of the modulation target, the three-dimensional model of the modulation target including a base layer model and multiple modulation structure layer models provided on the base layer model, the multiple modulation structure layer models being arranged in sequence and having height differences; printing the base layer according to the three-dimensional model of the modulation target; printing multiple modulation structure layers in sequence on the base layer according to the three-dimensional model of the modulation target; and obtaining a multi-layer modulated structure fusion modulation target after ultraviolet curing and plasma surface treatment. The present invention prepares partitioned, layered, and diversified modulation structures based on 3D printing, and performs plasma roughening treatment. It has the advantages of precise and controllable modulation patterns, complex and variable structures, high dimensional resolution, simple and efficient processes, and low costs, and is helpful in simulating the effects of various uneven factors on the surface of the target pellet on the fusion ignition process.

Description

Technical Field

[0001] The present invention relates to the technical field of inertial confinement fusion, and in particular to a method for preparing a multi-layer modulation structure fusion modulation target. Background Art

[0002] As a key approach to achieving controlled thermonuclear fusion, inertial confinement fusion (ICF) has become one of the most extensively researched and rapidly developing frontier scientific fields worldwide. To measure the instability of a fusion ignition device during the acceleration phase of a spherical implosion, it is necessary to artificially introduce surface modulation patterns to simulate the inhomogeneous structure of the target pellet surface. Current machining methods primarily include precision turning, chemical etching, ion beam etching, laser machining, and plasma jet machining. These methods can be further categorized into template casting and direct machining, depending on the manufacturing approach.

[0003] The spin coating process in the template preparation process of precision turning is only suitable for the preparation of planar modulation targets. The modulation pattern contour will be deformed during the template transfer process using spin coating, casting, and hot pressing processes, and the modulation accuracy is difficult to control. This method is also limited by factors such as lathe fixtures, multiple degrees of freedom of the tool, and turning feed algorithms. Chemical etching is usually only suitable for the processing of planar modulation targets. Due to the slow reaction time of chemical etching, the reaction products are difficult to remove in time, the corrosion surface roughness is high, and the controllability is poor. Ion beam etching also requires mask patterning. At the same time, due to its highly vertical etching characteristics, it is generally only used for the processing of grid and strip modulation patterns in planar modulation targets. Therefore, the above methods are not suitable for the processing of curved surfaces and multi-layer modulation patterns.

[0004] The plasma jet machining method introduces a modulated pattern by exciting and generating a plasma jet under certain voltage and frequency conditions. In 2019, Xie Fan and others from Shanghai Jiao Tong University wrote an article entitled "Micromachining of Polymer Films Based on Atmospheric Pressure Cold Plasma Jet" in the collection of abstracts of the 12th National Nuclear Target Technology Academic Exchange Conference. Using this method, they successfully achieved sinusoidal pattern modulation with a period and amplitude of 400μm and 100nm on a CHCl film under atmospheric conditions. However, when using this method, problems such as difficulty in clamping the target pellet, low modulation accuracy, and low efficiency will arise. Laser ablation machining technology is a method of realizing modulated structure processing by utilizing the characteristics of the interaction between the laser beam and matter to perform micromachining of metal and non-metal materials. Carlson, Lane C, et al. of Gen Atom published an article titled "Surface Modification of ICF Target Capsules by Pulsed Laser Ablation" in Fusion Science and Technology, 2016, 70(2), 141-153. Using this method, they successfully achieved sinusoidal pattern modulation with a period of 30-200 μm and an amplitude of 100 nm-10 μm on GDP and HDC targets, respectively. However, laser processing of pattern modulation on non-planar targets presents challenges such as spherical shell fragmentation, difficulty in clamping the target, and low modulation accuracy. Furthermore, it is difficult to prepare multi-layer, diverse modulation structures.

[0005] In order to solve the problems that are easy to occur when processing the ablation layer modulation pattern using the above method, such as low modulation accuracy, poor modulation quality, easy breakage of the spherical shell, complex process and difficulty in processing multi-layer modulation structures, a new fusion modulation target preparation method is urgently needed to prepare partitioned, layered and diversified modulation structures to simulate the influence of various uneven factors on the target surface on the fusion ignition process. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a method for preparing a multi-layer modulated structure fusion modulation target.

[0007] According to one aspect of the present invention, a method for preparing a multi-layer modulated structure fusion modulation target is provided, the method comprising:

[0008] Establishing a three-dimensional model of a modulation target, the three-dimensional model of the modulation target including a base layer model and a plurality of modulation structure layer models disposed on the base layer model, wherein the plurality of modulation structure layer models are arranged in sequence and have height differences;

[0009] Printing the base layer according to the modulated target three-dimensional model;

[0010] Printing a plurality of modulation structure layers sequentially on the base layer according to the modulation target three-dimensional model;

[0011] After ultraviolet curing and plasma surface treatment, a multi-layer modulation structure fusion modulation target is obtained.

[0012] Furthermore, the modulation target three-dimensional model includes a base layer model and a plurality of modulation structure layer models provided on the base layer model, wherein:

[0013] The base layer model is a single-layer plane structure or a hollow spherical shell structure, and a gold cone fixing groove for fixing the gold cone is reserved at the bottom end of the base layer model.

[0014] Furthermore, printing the base layer according to the modulated target three-dimensional model includes:

[0015] Importing the modulated target three-dimensional model into two-photon printing software;

[0016] A photosensitive resin printing material that meets preset conditions is selected to print a base layer having a base modulation structure. The base modulation structure is arranged on the surface of the base layer and is a first periodic pattern with a set period and amplitude to increase the unevenness of the modulation target.

[0017] Furthermore, the photosensitive resin printing material is a transparent resin containing C and H elements.

[0018] Furthermore, according to the modulation target three-dimensional model, a plurality of modulation structure layers are printed sequentially on the base layer, including:

[0019] A plurality of modulation structure layers are printed in sequence, wherein the thickness of each modulation structure layer is different to form a height difference, and the surface of each modulation structure layer is provided with a second periodic texture.

[0020] Furthermore, the first periodic patterns and the second periodic patterns are any one of a strip structure, a grid structure, a corrugated structure, a concentric ring structure and a golf ball structure, and the cross-sectional graphs of the base layer and the modulation structure layer are any one of a sine wave, a triangle wave and a square wave.

[0021] Furthermore, the period of the first periodic lines and the second periodic lines is 5-400 μm, the amplitude is 50 nm-100 μm, and the number of periods is 5-100.

[0022] Furthermore, a periodic gap is formed between the modulation structure layer and the base layer, and the gap corresponds to the first periodic pattern. The gap is used to be filled with different types of gases to simulate the effects of different gases and airflow inhomogeneity on fusion ignition.

[0023] Further, after UV curing and plasma surface treatment, including:

[0024] After the printed whole is completely cured by ultraviolet light, its surface is modified using a He / O2 mixed plasma jet to obtain a controllable rough microstructure that increases the light-receiving area. It is then placed in alcohol for ultrasonic cleaning, ultimately obtaining a multi-layer modulated structure fusion modulation target that is used to simulate the various unevenness of the target pellet surface.

[0025] Furthermore, the thickness of the base layer is 10 μm-200 μm, and the thickness of the multi-block modulation structure layer is 50 nm-100 μm.

[0026] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0027] The present invention provides a method for preparing a multi-layer modulated structure fusion modulation target. Since the multi-layer modulation structure is printed layer by layer according to a given model, the thickness of each layer in the vertical direction of the modulation target, the size of each pattern in the horizontal direction, the overall shape of the modulation target, the cross-sectional shape of the modulation pattern, etc. are all controllable and adjustable. In addition, after the modulation target surface is modified by plasma, a controllable rough microstructure with an increased light-receiving area can be obtained. This method is conducive to the artificial on-demand manufacture of modulation target structures for simulating target pellet surface unevenness and testing the ablation condition of the target pellet by backlit X-rays. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0029] Figure 1 Schematic diagram of a process for preparing a multi-layer modulated structure fusion modulation target in one embodiment of the present invention;

[0030] Figure 2 This is a model design diagram of a spherical shell modulation target base layer in one embodiment of the present invention;

[0031] Figure 3 This is a printed partition diagram of the modulation structure layer of the spherical shell modulation target in one embodiment of the present invention;

[0032] Figure 4 Schematic diagram of the forming sequence of the modulation structure layer of the spherical shell modulation target in one embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a spherical shell modulation target in one embodiment of the present invention;

[0034] Figure 6 A model design diagram of a spherical shell modulation target base layer in another embodiment of the present invention;

[0035] Figure 7 A schematic diagram of a spherical shell modulation target in another embodiment of the present invention;

[0036] Figure 8 A model design diagram of a planar modulation target according to another embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of a planar modulation target in another embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0039] Reference Figure 1 , is a schematic flow chart of a method for preparing a multi-layer modulated structure fusion modulation target provided by one embodiment of the present invention, the method comprising:

[0040] S1. Establishing a three-dimensional model of a modulation target, wherein the three-dimensional model of the modulation target includes a base layer model and multiple modulation structure layer models disposed on the base layer model, wherein the multiple modulation structure layer models are arranged in sequence with height differences;

[0041] S2. Printing the base layer according to the modulated target three-dimensional model;

[0042] S3, printing multiple modulation structure layers sequentially on the base layer according to the modulation target three-dimensional model;

[0043] S4. After UV curing and plasma surface treatment, a multi-layer modulated structure fusion modulation target is obtained.

[0044] In step S1, the modulation target three-dimensional model includes a base layer model and a plurality of modulation structure layer models arranged on the base layer model, thereby forming a multi-layer structure, wherein: the base layer model is a single-layer plane structure or a hollow spherical shell structure, thereby forming a plane modulation target or a spherical shell modulation target, and the base layer model of the hollow spherical shell structure is as follows: Figure 2 As shown, a gold cone fixing groove is reserved at the bottom of the base layer model for fixing the gold cone, so that it releases backlight X-rays through the outer wall of the modulation target for fusion ignition ablation testing.

[0045] In some embodiments, in step S2, the three-dimensional model of the modulation target is imported into the two-photon printing software; a photosensitive resin printing material that meets the preset conditions is selected, and a base layer having a base modulation structure (i.e., a base modulation layer) is printed. Depending on different base layer models, the base layer can be a single-layer planar structure or a hollow spherical shell structure; the base modulation structure is provided on the surface of the base layer, and is a first periodic pattern with a set period and amplitude, so as to increase the unevenness of the modulation target.

[0046] Preferably, the photosensitive resin printing material is a transparent resin containing C and H elements, such as SU-8, Ormocere, PEGDA, AZ glue, As2S3, IP-L 780, IP-G 780, etc. Because printing utilizes the light-curing properties of the photosensitive resin, the modulation target is prepared at room temperature and pressure without mechanical stress. Therefore, the surface of the modulation target is protected from the high temperature and mechanical damage to the target pellet surface during laser ablation micromachining, precision turning template molding, ion beam etching, and plasma microjet etching. The modulation target body is uniform and transparent, with uniform size, controllable capsule wall, and good surface quality.

[0047] In some embodiments, in step S3, after forming one modulation structure layer region, the next region is formed according to the printing order of the two-photon printer, and multiple modulation structure layers are printed in sequence, wherein the thickness of each modulation structure layer is different to form a height difference. In the embodiment of the present invention, the modulation target is a target type that simulates the influence of various surface inhomogeneities of the target pellet on fusion target shooting. The thickness of the base layer and the modulation structure layer is determined according to the thickness of the spherical shell during actual target shooting. Preferably, the thickness of the base layer is 10μm-200μm, and the thickness of the multiple modulation structure layers is 50nm-100μm. The surface of each modulation structure layer is provided with a second periodic pattern. Preferably, the first periodic pattern and the second periodic pattern are any one of a strip structure, a grid structure, a corrugated structure, a concentric ring structure, and a golf ball structure, and the cross-sectional pattern of the base layer and the modulation structure layer is any one of a sine wave, a triangle wave, and a square wave. The period of the first periodic texture and the second periodic texture is 5-400 μm, the amplitude is 50 nm-100 μm, and the number of periods is 5-100.

[0048] Specifically, if Figure 3 As shown in the figure, according to the various inhomogeneities of the simulated target surface, the modulation structure layer is divided into nine blocks. Figure 4 Nine modulation structure layers with different layer thicknesses and periodic patterns on the surface are printed in the order shown. Periodic gaps can be reserved between the modulation structure layer and the base modulation layer, and in-situ UV curing is performed at the same time, so that Figure 5 The modulated target structure in .

[0049] Those skilled in the art will appreciate that, depending on specific circumstances and actual needs, the number of modulation structure layers may be other numbers, thereby simulating the effect of any non-uniformity on the target pellet surface on fusion ignition.

[0050] Because the substrate layer has a first periodic pattern on its surface, a periodic gap is formed between the modulated structure layer and the substrate layer. This gap corresponds to the first periodic pattern and is used to fill with different types of gas to simulate the effects of different gases and gas flow inhomogeneities on fusion ignition. In step S4, after the printed structure is completely cured with UV light, its surface is modified using a He / O2 mixed plasma jet to obtain a controllable rough microstructure that increases the light-receiving area as required. The structure is then ultrasonically cleaned in alcohol, ultimately resulting in a multi-layered modulated structure fusion modulation target that simulates the various surface inhomogeneities of the target pellet.

[0051] In the above embodiment, the modulation target is divided into a plane modulation target and a spherical shell modulation target, wherein the area of ​​the plane modulation target is 1mm 2 -100mm 2 The larger the area of ​​the same plane modulation target, the more simulations of the effect of surface inhomogeneity on fusion ignition can be performed; the diameter of the spherical shell modulation target is completely determined by the diameter of the target pellet during actual shooting. Preferably, the diameter of the spherical shell modulation target is 0.05mm-10mm, so as to simulate the effect of surface inhomogeneity on fusion ignition. The first periodic patterns on the base layer and the second periodic patterns on the nine modulation structure layers can be parallel, perpendicular, or at any angle to each other. The modulation target can be used to simulate the effect of various surface inhomogeneities on the fusion ignition process of target pellets such as proton targets, X-ray backlight imaging targets, and target pellet shells that can be wetted with fuel liquid. The layer thickness of each slice pattern of the modulation target during two-photon printing is 0.1μm-5μm, the nano-displacement stage controls the focus movement speed in the photosensitive resin to be 0-1mm / s, and the repeatability error is ≤±10nm. Since the resolution of two-photon printing is less than 100nm, the minimum layer thickness is 0.05μm, and the three-dimensional motion repeatability error during the printing process is ≤±10nm, the period and amplitude resolution of the modulation pattern when preparing fusion modulation targets using the two-photon printing method are much higher than those of laser ablation micromachining, precision turning template molding, ion beam etching, and plasma microjet etching. In addition, due to the stable and continuous printing, the surface texture of the target pellet is consistent, with the advantages of high modulation pattern resolution and clear and regular texture.

[0052] The two-photon printing method can be used to directly additively prepare planar or spherical shell modulation targets. This method is simple and efficient, eliminating the need to first go through complex process steps to prepare the CH spherical shell and ablation layer, and then use laser ablation micromachining and plasma microjet etching methods to subtractively manufacture the modulation pattern. It also avoids problems such as the spherical shell's fragility and difficulty in clamping. Moreover, the two-photon printing method can be used to draw drawings of any desired shape through software, making it possible to produce not only planar modulation targets but also spherical shell modulation targets. Modulation targets with any structure, such as stripes, grids, corrugations, concentric ring structures, and golf balls, can be processed. The modulation pattern can be any pattern, such as sine waves, triangle waves, and square waves. The size and shape of the processable modulation patterns are controllable and diverse. In contrast, other methods cannot do this: in the turning template method, the modulation pattern will undergo certain deformation during the transfer process due to multiple / repeated transfers and heating and cooling processes. The modulation accuracy is difficult to control and is easily restricted by factors such as lathe fixtures, multiple degrees of freedom of the tool, and turning feed algorithms. It is relatively difficult to process modulation patterns on non-planar modulation targets; the ion beam etching method requires mask patterning, and due to its highly vertical etching characteristics, it is generally only used for grid and strip modulation pattern processing in planar modulation targets; when using methods such as laser ablation micromachining and plasma microjet etching to process modulation targets, the modulation pattern depends entirely on the motion control of the translation stage. The nozzle, target pellet, and translation stage will all limit the diversity of the modulation pattern.

[0053] In the method of the above-described embodiment of the present invention, since the multilayer modulation structure is printed layer by layer according to a given model, 3D printing can be used to produce partitioned, layered, and diversified modulation structures. Therefore, the thickness of each layer in the modulation target in the vertical direction, the size of each pattern in the horizontal direction, the overall shape of the modulation target, and the cross-sectional shape of the modulation pattern are all controllable and adjustable. The gaps between the base layer and the nine modulation structure layers can be filled with different gases, simulating the effects of different gas and gas flow inhomogeneities on fusion ignition. Furthermore, after modifying the modulation target surface with a He / O2 mixed plasma jet, a controllable rough microstructure with an increased light-receiving area can be obtained. Therefore, this method facilitates the on-demand fabrication of modulation target structures for simulating target pellet surface inhomogeneities and testing the ablation of target pellets by backlit X-rays. The method has the advantages of precise controllable modulation patterns, complex and variable structures, high dimensional resolution, simple and efficient processes, and low cost, and is helpful in simulating the effects of various surface inhomogeneities on the fusion ignition process.

[0054] The technical solution of the present application is further described below with more detailed embodiments.

[0055] Example 1

[0056] A method for preparing a 180° spherical modulation target, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the following steps are included:

[0057] Step 1: Create a 3D model of a multi-layer spherical shell modulation target and import it into the two-photon printing slice software. The slice thickness is 0.1 μm. The cross-sectional angle of the modulation target is 180°, and the modulation structure layer is divided into nine pieces, such as Figure 3 The circular hole at the bottom of the substrate has a diameter of 200 μm and is used to fix the gold cone for fusion ignition ablation testing of the spherical shell target.

[0058] Step 2: Select photosensitive resin PEGDA as the printing material, confine the reaction area to the vicinity of the focus by laser focusing, and use the nano-displacement stage to control the focus to move in a specific order within the photosensitive resin to print the hollow spherical shell structure substrate, such as Figure 2 As shown in the figure, the diameter of the spherical shell structure is 1 mm, the thickness of the base layer is 50 μm, the surface shape is a concentric ring structure, the cross-sectional pattern of the periodic texture is a sine wave, the amplitude is 2 μm, the period is 100 μm, and the number of periods is 30;

[0059] Step 3: If Figure 4 As shown, nine modulation structure layers are printed in the order from ① to ⑨, wherein the thicknesses of the nine modulation structure layers are 2μm, 10μm, 5μm, 15μm, 20μm, 10μm, 10μm, 20μm and 5μm, forming a certain height difference. The surface is provided with parallel lines parallel to the base modulation pattern. The cross-sectional pattern of the periodic lines is a sine wave with an amplitude of 1μm and a period of 100μm. At the same time, in-situ UV curing scanning is performed;

[0060] Step 4: After the printed whole is completely cured by UV light, the surface is modified using a He / O2 mixed plasma jet to obtain a controllable rough microstructure that increases the light receiving area as needed. The diameter of the plasma jet is 100 μm, the scanning speed is 1 mm / s, and the scanning time is 10 s. It is then placed in alcohol for ultrasonic cleaning to obtain a spherical shell modulated target structure used to simulate the various unevenness of the 180° target surface, such as Figure 5 shown.

[0061] Example 2

[0062] A method for preparing a 100° spherical modulation target, such as Figure 6 and Figure 7 As shown, the following steps are included:

[0063] Step 1: Create a 3D model of a multi-layer spherical shell modulation target and import it into the two-photon printing slicing software. The slice thickness is 0.1 μm. The cross-sectional angle of the modulation target is 100°, and the modulation structure layer is divided into nine sections. The circular hole at the bottom of the base layer has a diameter of 200 μm and is used to fix the gold cone for fusion ignition ablation testing of the spherical shell target.

[0064] Step 2: Select photosensitive resin PEGDA as the printing material, confine the reaction area to the vicinity of the focus by laser focusing, and use the nano-displacement stage to control the focus to move in a specific order within the photosensitive resin to print the hollow spherical shell structure substrate, such as Figure 6 As shown in the figure, the diameter of the spherical shell structure is 1 mm, the thickness of the base layer is 10 μm, the surface shape is a grid structure, the cross-sectional pattern of the periodic texture is a rectangular wave, the amplitude is 1 μm, the period is 60 μm, and the number of grids is 400;

[0065] Step 3: Print nine modulation structure layers in the order of ① to ⑨. The thicknesses of the nine modulation structure layers are 5μm, 2μm, 3μm, 2μm, 3μm, 2μm, 10μm, 2μm and 5μm, forming a certain height difference. The surface is provided with parallel lines perpendicular to the base modulation pattern. The cross-sectional pattern of the periodic lines is a rectangular wave with an amplitude of 1μm and a period of 60μm. In-situ UV curing scanning is performed at the same time.

[0066] Step 4: After the printed whole is completely cured by UV light, the surface is modified using a He / O2 mixed plasma jet to obtain a controllable rough microstructure that increases the light receiving area as needed. The diameter of the plasma jet is 50 μm, the scanning speed is 1 mm / s, and the scanning time is 15 seconds. It is then placed in alcohol for ultrasonic cleaning to obtain a spherical shell modulated target structure used to simulate the various unevenness of the 100° target surface, such as Figure 7 shown.

[0067] Example 3

[0068] A method for preparing a planar modulation target, such as Figure 8 and Figure 9 As shown, the following steps are included:

[0069] Step 1: Create a three-dimensional model of the plane modulation target, such as Figure 8 As shown, it was imported into the two-photon printing slice software, and the slice thickness was 0.1μm. Among them, the modulation structure layer is divided into two pieces, the area of ​​the left and right pieces is 0.5mm 2 ;

[0070] Step 2: Select the photosensitive resin Ormocere as the printing material. Use laser focusing to confine the reaction area near the focal point. Use a nanometer displacement stage to control the focus in a specific sequence within the photosensitive resin to print a thin layer of square substrate. The substrate has a side length of 1mm and a thickness of 50μm. The modulation layer is 10μm thick. The surface shape is a grid structure with a side length of 140μm, a gap width of 5μm between the grids, and a grid number of 50.

[0071] Step 3: Split the substrate into two and print a modulation layer on the right side. The modulation layer has a thickness of 100 μm, a corrugated surface shape, and a sinusoidal cross-sectional pattern with an amplitude of 4 μm, a period of 50 μm, and 40 periods, forming a height difference between the left and right sides. Simultaneously, perform in-situ UV curing scanning.

[0072] Step 4: After the printed whole is completely cured by UV light, the surface is modified using a He / O2 mixed plasma jet to obtain a controllable rough microstructure that increases the light receiving area as needed. The diameter of the plasma jet is 100 μm, the scanning speed is 1 mm / s, and the scanning time is 10 s. It is then placed in alcohol for ultrasonic cleaning to obtain a planar modulated target structure used to simulate the surface unevenness of the target pellet, such as Figure 9 As shown, it can be used for fusion ignition ablation testing.

[0073] The preparation method of the multi-layer modulated structure fusion modulation target in the above embodiment is based on 3D printing technology to directly additively prepare a fusion modulation target with a partitioned, layered, and diversified modulation structure, and perform plasma roughening treatment to solve the problem that subtractive processing technology is difficult to process complex multi-layer modulation patterns. It has the advantages of precise controllable modulation patterns, complex and variable structures, high dimensional resolution, simple and efficient processes, and low costs, which helps to simulate the influence of various uneven factors on the target surface on the fusion ignition process.

[0074] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various modifications or variations within the scope of the claims without affecting the essence of the present invention. The above preferred features may be used in any combination as long as they do not conflict with each other.

Claims

1. A method for preparing a multi-layer modulated structure fusion modulation target, characterized in that: include: Establishing a three-dimensional model of a modulation target, the three-dimensional model of the modulation target including a base layer model and a plurality of modulation structure layer models disposed on the base layer model, wherein the plurality of modulation structure layer models are arranged in sequence and have height differences; Printing the base layer according to the modulated target three-dimensional model; Printing a plurality of modulation structure layers sequentially on the base layer according to the modulation target three-dimensional model; After UV curing and plasma surface treatment, a multi-layer modulated structure fusion modulation target is obtained; in: Printing the base layer according to the modulated target three-dimensional model includes: Importing the modulated target three-dimensional model into two-photon printing software; Selecting a photosensitive resin printing material that meets preset conditions, and printing a base layer having a base modulation structure, wherein the base modulation structure is provided on the surface of the base layer and is a first periodic pattern with a set period and amplitude, so as to increase the non-uniformity of the modulation target; According to the modulation target three-dimensional model, a plurality of modulation structure layers are sequentially printed on the base layer, including: Printing multiple modulation structure layers in sequence, wherein the thickness of each modulation structure layer is different to form a height difference, and the surface of each modulation structure layer is provided with a second periodic pattern; A periodic gap is formed between the modulation structure layer and the base layer, and the gap corresponds to the first periodic pattern. The gap is used to be filled with different types of gases to simulate the effects of different gases and airflow inhomogeneity on fusion ignition.

2. The method for preparing a multi-layer modulated structure fusion modulation target according to claim 1, characterized in that: The modulation target three-dimensional model includes a base layer model and a plurality of modulation structure layer models arranged on the base layer model, wherein: The base layer model is a single-layer plane structure or a hollow spherical shell structure, and a gold cone fixing groove for fixing the gold cone is reserved at the bottom end of the base layer model.

3. The method for preparing a multi-layer modulated structure fusion modulation target according to claim 1, characterized in that: The photosensitive resin printing material is a transparent resin containing C and H elements.

4. The method for preparing a multi-layer modulated structure fusion modulation target according to claim 1, characterized in that: The first periodic lines and the second periodic lines are any one of a strip structure, a grid structure, a corrugated structure, a concentric ring structure and a golf ball structure, and the cross-sectional graphs of the base layer and the modulation structure layer are any one of a sine wave, a triangle wave and a square wave.

5. The method for preparing a multi-layer modulated structure fusion modulation target according to claim 1, characterized in that: The period of the first periodic lines and the second periodic lines is 5-400 μm, the amplitude is 50 nm-100 μm, and the number of periods is 5-100.

6. The method for preparing a multi-layer modulated structure fusion modulation target according to claim 1, characterized in that: UV-cured and plasma-treated, including: After the printed whole is completely cured by ultraviolet light, its surface is modified using a He / O2 mixed plasma jet to obtain a controllable rough microstructure that increases the light-receiving area. It is then placed in alcohol for ultrasonic cleaning, ultimately obtaining a multi-layer modulated structure fusion modulation target that is used to simulate the various unevenness of the target pellet surface.

7. The method for preparing a multi-layer modulated structure fusion modulation target according to claim 1, characterized in that: The thickness of the base layer is 10 μm-200 μm, and the thickness of the multi-block modulation structure layer is 50 nm-100 μm.

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