A bridge foil plasma process radiography method, system, apparatus, and medium

Abstract

This invention discloses a method, system, device, and medium for radiographic imaging of bridged foil plasma processes, relating to the field of bridged foil plasma imaging. The method includes: establishing a simulation model for bridged foil plasma imaging using Monte Carlo simulation; determining experimental parameters for bridged foil plasma imaging based on the simulation model, including: X-ray source type, laser power density, X-ray energy point, bridged foil thickness, substrate material, and substrate thickness; establishing an experimental model for bridged foil plasma imaging based on the experimental parameters, including: an X-ray source, a bridged foil, a substrate, and a detector; the X-ray source is used to generate X-rays; the bridged foil is used for electro-explosion to form bridged foil plasma; the detector is used to detect X-rays passing through the bridged foil to image the bridged foil plasma; and a radiographic experiment is conducted using the experimental model to drive a plasma process with an electro-explosion device, obtaining dynamic images of the bridged foil plasma. This invention enables high spatiotemporal resolution dynamic radiographic imaging of bridged foil plasma processes.

Description

Technical Field

[0001] This invention relates to the field of bridged foil plasma imaging, and in particular to a method, system, device and medium for radiographic imaging of bridged foil plasma processes. Background Technology

[0002] Electro-explosive foil initiators are a new type of high-safety pyrotechnic device. They utilize an electro-explosion to drive a small, high-speed flying disc to ignite the explosive charge. This design isolates the electro-explosive transducer from the explosive charge, significantly improving intrinsic safety. During the initiator's operation, the plasma generated by the electro-explosion is the initial driving source. The uniformity of its morphology and distribution determines the flying disc's velocity and attitude, thus significantly influencing the flying disc's impact-induced detonation. Los Alamos National Laboratory (LANL) in the United States has established a high-resolution dynamic imaging technique using an Advanced Photon Source (APS) device to obtain plasma imaging results of bridge foil. The results show that micro-defects affect the plasma distribution, thereby significantly influencing the flying disc morphology.

[0003] For the transient plasma formation process driven by an electrical explosion, plasma morphology distribution is a key state parameter for the effectiveness of the detonator and a critical problem that urgently needs to be solved, but effective diagnostic methods are lacking. Due to the high absorption of X-rays by the bridge foil substrate, the weak X-ray absorption of the bridge foil makes effective imaging difficult, making it challenging to capture the plasma morphology distribution. Currently, only the LANL laboratory in the United States has reported successfully capturing plasma morphology distribution using a synchrotron radiation facility. In China, visible light imaging is currently mainly used to obtain the contour information of the transient plasma explosion, but it cannot diagnose internal structural information. Research on high spatiotemporal resolution X-ray imaging is relatively limited. Summary of the Invention

[0004] The purpose of this invention is to provide a method, system, device and medium for radiographic imaging of bridged foil plasma processes, so as to achieve dynamic radiographic imaging of bridged foil plasma processes with high spatiotemporal resolution.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A method for radiographic imaging of a bridged foil plasma process includes:

[0007] A simulation model for bridged foil plasma imaging was established using the Monte Carlo simulation method.

[0008] Based on the simulation model, the experimental parameters for bridged foil plasma imaging were determined; the experimental parameters include: X-ray source type, laser power density, X-ray energy point, bridged foil thickness, substrate material, substrate thickness, and imaging parameters.

[0009] Based on the experimental parameters, an experimental model for bridged foil plasma imaging was established. The experimental model includes an X-ray source, a bridged foil, a substrate, and a detector. The X-ray source is used to generate X-rays. The bridged foil is located on the substrate. The bridged foil is used to generate bridged foil plasma through an electrical explosion. The detector is used to detect X-rays passing through the bridged foil to image the bridged foil plasma.

[0010] Using the experimental model, a photographic experiment was conducted on the plasma process driven by the electric explosion device to obtain dynamic images of the bridged foil plasma.

[0011] Optionally, it also includes:

[0012] Obtain the current curve of the plasma process driven by the electro-explosive device;

[0013] Based on the current curve, determine the diagnostic timing of the diagnostic plasma process;

[0014] The evolution of the bridge foil plasma is determined based on the dynamic images and the diagnostic time.

[0015] Optionally, the experimental model further includes: a strong magnet; the strong magnet is located between the bridge foil and the detector; the strong magnet is used to generate a magnetic field to deflect high-energy electrons between the bridge foil and the detector from the imaging direction of X-rays.

[0016] Optionally, the experimental model further includes: a shielding cone; the shielding cone is located between the strong magnet and the detector, and the cone angle of the shielding cone is determined by the imaging receiving solid angle of the detector; the shielding cone is used to shield stray X-rays and high-energy particles between the strong magnet and the detector.

[0017] Optionally, the X-ray source includes: a laser generator, an off-axis parabolic mirror, and a target nozzle; the laser generator is used to generate a laser beam; the off-axis parabolic mirror is used to focus the laser beam to obtain a point source; the target nozzle is used to eject a target; the point source interacts with the target to generate X-rays.

[0018] Optionally, the X-ray source is a Betatron radiation source driven by a femtosecond laser or a picosecond laser; the size of the X-ray source is on the microsecond scale; and the laser power density is greater than or equal to 10. 18 W / cm 2 The X-ray energy point is greater than 10 keV.

[0019] Optionally, the substrate material is CH material; the substrate thickness is 0.5 mm; and the bridge foil thickness is less than or equal to 8 μm.

[0020] A bridged foil plasma process radiographic system includes:

[0021] The simulation modeling module is used to establish a simulation model of bridged foil plasma imaging using the Monte Carlo simulation method;

[0022] The parameter determination module is used to determine the experimental parameters for bridged foil plasma imaging based on the simulation model. The experimental parameters include: X-ray source type, laser power density, X-ray energy point, bridged foil thickness, substrate material, substrate thickness, and imaging parameters.

[0023] An experimental construction module is used to establish an experimental model for bridged foil plasma imaging based on the experimental parameters. The experimental model includes an X-ray source, a bridged foil, a substrate, and a detector. The X-ray source is used to generate X-rays. The bridged foil is located on the substrate. The bridged foil is used to form bridged foil plasma through an electrical explosion. The detector is used to detect X-rays passing through the bridged foil to image the bridged foil plasma.

[0024] The dynamic photography module is used to conduct photographic experiments on the plasma process driven by the electric explosion device using the experimental model, and to obtain dynamic images of the bridged foil plasma.

[0025] An electronic device includes a memory and a processor, the memory storing a computer program, and the processor running the computer program to cause the electronic device to perform the above-described bridged foil plasma process radiography method.

[0026] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for radiographic imaging of a bridged foil plasma process.

[0027] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0028] The present invention provides a method for radiographic imaging of bridged foil plasma processes. By utilizing Monte Carlo simulation, a simulation model of bridged foil plasma imaging is established. Based on this simulation model, experimental parameters for bridged foil plasma imaging are determined, effectively solving the parameter design challenges in frontal radiography of bridged foil. An experimental model for bridged foil plasma imaging is established using experimental parameters determined by the simulation model, including X-ray source type, laser power density, X-ray energy point, bridged foil thickness, substrate material, and substrate thickness. Radiographic experiments are then conducted using an electrically driven plasma device to drive the plasma process, enabling the acquisition of dynamic images of the bridged foil plasma and achieving high spatiotemporal resolution dynamic radiographic imaging of the bridged foil plasma process. Furthermore, the present invention utilizes laser-driven X-ray imaging technology to photograph the bridged foil plasma process, resulting in a more miniaturized and economical approach compared to existing technologies. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A flowchart of the radiographic method for bridged foil plasma processes provided by the present invention;

[0031] Figure 2 An imaging simulation optimization diagram of the filamentation process of bridge foils of different thicknesses provided by the present invention;

[0032] Figure 3 A schematic diagram illustrating the principle of radiographic imaging of the bridge foil plasma process provided by the present invention;

[0033] Figure 4 A schematic diagram illustrating the working principle of the strong magnet and shielding cone provided by this invention.

[0034] Symbol explanation:

[0035] Laser beam-1, off-axis parabolic mirror-2, target nozzle-3, bridge foil-4, substrate-5, detector-6, X-ray source-7, strong magnet-8, shielding cone-9. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The purpose of this invention is to provide a method, system, device and medium for radiographic imaging of bridged foil plasma processes, so as to achieve dynamic radiographic imaging of bridged foil plasma processes with high spatiotemporal resolution.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] This invention provides a method for radiographic imaging of a bridged foil plasma process. For example... Figure 1 As shown, the bridge foil plasma process radiography method includes:

[0041] Step S1: Establish a simulation model for bridged foil plasma imaging using the Monte Carlo simulation method. Specifically, the simulation model is a point projection imaging model of a microfocus X-ray source.

[0042] Step S2: Based on the simulation model, determine the experimental parameters for bridged foil plasma imaging. The experimental parameters include: X-ray source type, laser power density, X-ray energy point, bridged foil thickness, substrate material, substrate thickness, and imaging parameters. The imaging parameters include: object distance, image distance, magnification, detection area, number of pixels in the detection area, and imaging diagnostic field of view.

[0043] Preferably, the X-ray source is a Betatron radiation source driven by a femtosecond laser or a picosecond laser; the size of the X-ray source is on the microsecond scale; and the laser power density is greater than or equal to 10. 18 W / cm 2 The X-ray energy point is greater than 10 keV.

[0044] Preferably, the substrate material is CH material; the substrate thickness is 0.5 mm; and the bridge foil thickness is less than or equal to 8 μm.

[0045] Specifically, a point projection imaging model of a microfocus X-ray source was established using the Monte Carlo simulation method, including elements such as the X-ray source, bridge foil, and detector. Based on this, the X-ray energy spectrum, bridge foil and substrate, and detector conditions were optimized to provide input conditions for subsequent dynamic experiments. During the optimization process, an X-ray image was obtained by adjusting parameters such as the X-ray energy spectrum, bridge foil and substrate material, thickness, detector type, resolution, response efficiency, and pixels. The image quality was analyzed, and the parameters that met the set conditions were taken as the optimal parameters to optimize the imaging conditions. In this embodiment, the X-ray source is a Betatron radiation source driven by an fs laser, with a size on the micrometer scale. The substrate material is CH material (i.e., low-Z material, including polyester, PMMA, etc.). For different substrate materials such as polyester and PMMA, the X-ray energy point was optimized to be above 10 keV to reduce the absorption difference between the substrate and the bridge foil. Further optimization of the substrate thickness to approximately 0.5 mm was achieved to reduce the X-ray penetration distance, effectively lowering the X-ray energy requirement while ensuring X-ray penetration and effective support for the bridge foil. Simultaneously, utilizing the high absorption sensitivity of the bridge foil thickness to the X-ray band, the absorbance of bridge foils of different thicknesses after irradiation by a micro-focus X-ray source was calculated, obtaining the X-ray intensity distribution on the image plane, such as... Figure 2 As shown, the numbers 0, 2, 4, 6, and 8 represent different bridge foil thicknesses, with units of μm. Figure 2This indicates that X-rays can effectively penetrate the bridge foil and the substrate, and can effectively image the filamentous bridge foil, which can be used to analyze the main influencing factors of bridge foil plasma process imaging.

[0046] Step S3: Based on the experimental parameters, establish an experimental model for bridged foil plasma imaging. For example... Figure 3 and Figure 4 As shown, the experimental model includes: an X-ray source 7, a bridge foil 4, a substrate 5, and a detector 6; the X-ray source 7 is used to generate X-rays; the bridge foil 4 is located on the substrate 5; the bridge foil 4 is used to form bridge foil plasma through an electrical explosion; the detector 6 is used to detect X-rays passing through the bridge foil 4 in order to image the bridge foil plasma.

[0047] The X-ray source 7 includes a laser generator, an off-axis parabolic mirror 2, and a target nozzle 3. The laser generator generates a laser beam 1. The off-axis parabolic mirror 2 focuses the laser beam 1 to obtain a point source. The target nozzle 3 ejects a target material. The point source interacts with the target material to generate X-rays. In specific implementation, the laser beam 1 is a femtosecond laser or a picosecond laser, and the target material is a gas target or a microfilament target. The process of generating X-rays using an ultrashort pulse (ps / fs) laser is as follows:

[0048] FS (i.e., when the ultrashort pulse is a femtosecond laser): X-rays are generated by the interaction of a high-repetition-rate, high-energy fs laser with a gas target (ejected from a target nozzle). In this embodiment, the high-energy fs laser used has an energy ≥1J, specifically between several joules and tens of joules, and a laser pulse width ≤100fs, specifically tens of femtoseconds; it is focused using an off-axis parabolic mirror with an f-number (f represents the beam focal length / beam aperture) of approximately 20, and the power density after laser focusing is 10. 18 W / cm 2 The method involves the interaction of a focused laser with a gas target, ionizing and generating plasma. The laser then produces a wake field within the plasma, accelerating electrons (generated simultaneously with the wake field by the laser's ionization of the gas). These electrons oscillate within the wake field, producing Betatron X-rays. The X-rays produced by this method have a focal spot ≤5 μm, energies from several keV to tens of keV, pulse widths on the order of fs, divergence angles in the tens of mrad, and yields ≥10. 7 / Characteristics of hair.

[0049] Based on this, imaging simulation based on the point projection principle is coupled, and the detector's imaging parameters are designed as follows: object distance ≥ 200 mm, image distance ≥ 1000 mm, magnification ≥ 5 times; detection area ≥ 20 mm × 20 mm, pixel size ≤ 25 μm, and imaging diagnostic field of view ≥ 4 mm × 4 mm. Thus, a dynamic imaging technique with an energy point ≥ 10 keV, spatial resolution ≤ 5 μm, and temporal resolution ≤ 100 fs is established.

[0050] PS (i.e., when the ultrashort pulse is a picosecond laser): A high-energy ps laser interacts with a micro-wire target to generate a micro-focused, high-brightness X-ray source. The source size is ≤10μm, the pulse width is ≤100ps, and the energy range is 10–100keV. In this embodiment, the high-energy ps laser used has an energy ≥100J, a pulse width ≥1ps, a focused spot size of approximately 50μm, and a power density ≥1×10⁻⁶. 18 W / cm 2 The microfilament target is a metallic microfilament with a diameter ≤10μm, made of materials such as Mo, Au, and Cu. Through interaction with the gas target, ionization generates plasma. The laser produces a wake field in the plasma and accelerates electrons, which oscillate in the wake field to generate Betatron X-rays.

[0051] Based on this, imaging simulation based on the point projection principle is coupled. The detector's imaging parameters are designed as follows: object distance ≥ 30mm, image distance ≥ 450mm, magnification 15x; detection area ≥ 90mm × 120mm, pixel size ≤ 25μm, and imaging diagnostic field of view ≥ 6mm × 8mm. A dynamic imaging technique with energy ≥ 10keV, spatial resolution ≤ 10μm, and temporal resolution ≤ 100ps is established.

[0052] Among them, the spatial resolution of dynamic photography is achieved by matching the pixels in the detection area with the magnification, while the temporal resolution of dynamic photography is determined by the laser pulse width.

[0053] like Figure 4 As shown, the experimental model also includes: a strong magnet 8; the strong magnet 8 is located on the bridge foil ( Figure 4 The strong magnet 8 is used to generate a magnetic field in the imaging path, causing high-energy electrons between the bridge foil and the detector 6 to deviate from the imaging direction of X-rays. The experimental model further includes a shielding cone 9; the shielding cone 9 is located between the strong magnet 8 and the detector 6, and the cone angle of the shielding cone 9 is determined by the imaging receiving solid angle of the detector 6, and the two are approximately equal; the shielding cone 9 is used to shield stray X-rays and high-energy particles between the strong magnet 8 and the detector 6.

[0054] In the experiment, the X-ray conversion efficiency and brightness of the X-ray source were improved by adjusting the target composition, laser power density, and the interaction mode between the laser and the target. Utilizing the deflection property of high-energy electrons in a magnetic field, a strong magnet was used to deflect high-energy electrons away from the imaging direction, thus mitigating their interference with the imaging. Furthermore, a shielding cone was employed, with its angle close to the imaging receiving solid angle, to avoid interference from stray X-rays and high-energy particles. Through these multiple methods, imaging interference was reduced, thereby improving the imaging signal-to-noise ratio.

[0055] Step S4: Using the experimental model, conduct a photographic experiment on the plasma process driven by the electric explosion device to obtain dynamic images of the bridged foil plasma. The specific imaging process is as follows:

[0056] 1. An off-axis parabolic mirror focuses the laser beam.

[0057] 2. The focused laser (i.e., a point source) interacts with the gas target (ejected from a nozzle) to generate optimized X-rays (Betatron X-rays). Specifically, based on an ultrashort, ultra-intense laser device, high-energy ps lasers interact with micro-wire targets, or high-energy fs lasers interact with gas targets, to generate micro-focused, high-brightness X-rays.

[0058] During this process, the gas target density can be monitored by setting a gas density monitor, and the energy spectrum of Betatron X-rays can be monitored by setting an electron energy spectrum monitor.

[0059] 3. Betatron X-rays enter the atmosphere through the window.

[0060] 4. The detector detects and images the Betatron X-rays passing through the bridge foil.

[0061] Furthermore, the bridged foil plasma process radiographic method further includes: acquiring the current curve of the plasma process driven by the electric explosion device; determining the diagnostic moment of the plasma process based on the current curve; and determining the evolution process of the bridged foil plasma based on the dynamic image and the diagnostic moment. The burst point in the current curve is the current peak value, and the diagnostic moment can be determined based on this current peak value.

[0062] As a specific implementation method, a radiographic experiment was conducted on the process of an electro-explosion device driving a bridged foil plasma. An ultrashort pulse laser outputs a pre-programmed electrical signal to externally trigger the electro-explosion of the foil (including the bridged foil and substrate), ensuring precise time synchronization between the laser pulse and the foil's initiation moment. The electro-explosion device is triggered by an externally generated TTL signal. After several hundred ns, the electro-explosion forms bridged foil plasma, with the explosion point serving as the zero point for the initial motion of the flyer. The explosion state and location of the bridged foil are analyzed using current curves, and the diagnostic timing is determined. By adjusting the dynamic timing, radiographic imaging of the bridged foil plasma process can be performed, obtaining dynamic images of the plasma, analyzing its evolution, and determining the X-ray imaging detection capability and density range.

[0063] In summary, this invention proposes a solution for frontal imaging of plasma morphology using ultrashort pulse (ps / fs) laser-driven X-ray imaging technology. Addressing challenges such as the extremely thin bridge foil, minimal thickness variation during filamentation, and the impact of substrate thickness on X-ray observation, optimized design of the substrate material and thickness was implemented. The feasibility of dynamic testing of the bridge foil was verified through static laser X-ray testing and Monte Carlo simulation. High-power short-pulse lasers with high energy points, μm-scale focal spots, and ps-fs-scale pulse widths are used to generate X-rays. High-resolution radiographic imaging of plasma morphology is achieved through point projection imaging design. This research elucidates the evolution of microscale defects, providing crucial information for the physical design and process optimization of bridge foils. This approach offers high spatiotemporal resolution and dynamic radiographic capabilities, and is more miniaturized and economical than similar technologies in the US APS facility.

[0064] Example 2

[0065] To implement the method corresponding to Embodiment 1 above and achieve the corresponding functions and technical effects, a bridge foil plasma process radiographic system is provided below. The bridge foil plasma process radiographic system includes:

[0066] The simulation modeling module is used to establish a simulation model of bridged foil plasma imaging using the Monte Carlo simulation method.

[0067] The parameter determination module is used to determine the experimental parameters for bridged foil plasma imaging based on the simulation model. The experimental parameters include: X-ray source type, laser power density, X-ray energy point, bridged foil thickness, substrate material, substrate thickness, and imaging parameters.

[0068] An experimental construction module is used to establish an experimental model for bridged foil plasma imaging based on the experimental parameters. The experimental model includes an X-ray source, a bridged foil, a substrate, and a detector. The X-ray source is used to generate X-rays. The bridged foil is located on the substrate. The bridged foil is used to form bridged foil plasma through an electrical explosion. The detector is used to detect X-rays passing through the bridged foil to image the bridged foil plasma.

[0069] The dynamic photography module is used to conduct photographic experiments on the plasma process driven by the electric explosion device using the experimental model, and to obtain dynamic images of the bridged foil plasma.

[0070] Example 3

[0071] This invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to enable the electronic device to perform the bridged foil plasma process radiography method of Embodiment 1. The electronic device may be a server.

[0072] In addition, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the bridge foil plasma process radiography method in Embodiment 1.

[0073] This invention provides a solution for imaging bridged foil plasma processes using ultrashort pulse (ps / fs) laser-driven high spatiotemporal resolution X-ray imaging technology. A Monte Carlo simulation method is used to establish a bridged foil plasma simulation model based on point projection imaging, simulating and optimizing imaging elements such as the X-ray source, bridged foil plasma, and detector. This effectively reduces the influence of the bridged foil substrate on absorption and enhances the clarity of the bridged foil region imaging. Based on an experimental platform using an ultrashort pulse (ps / fs) laser device, a micro-focus, high-brightness X-ray source is generated using high-energy ultrashort pulse lasers. Coupled with the optimized design of bridged foil imaging simulation, a dynamic imaging technique with an equivalent energy point ≥10keV and high spatiotemporal resolution is established. By adjusting the laser power density, the X-ray conversion efficiency and source brightness are improved. Furthermore, various shielding methods are used to solve the problem of high-energy electron and proton interference on imaging. Dynamic experiments were conducted, obtaining dynamic evolution images of the bridged foil plasma; the plasma process is clear, and the image spatial resolution is high.

[0074] Compared with the prior art, the present invention has the following advantages:

[0075] 1. For transient testing of bridged foil plasma processes, a solution is proposed to use ultrashort pulse (ps / fs) laser-driven high spatiotemporal resolution X-ray imaging technology to capture images of bridged foil plasma processes. This solution is more miniaturized and economical than similar technologies such as the American APS device.

[0076] 2. A simulation model for bridge foil plasma imaging was established using the Monte Carlo simulation method, which effectively solved the parameter design problem for frontal imaging of bridge foil.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0078] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bridge foil plasma process radiography method, characterized by, include: A simulation model for bridged foil plasma imaging was established using the Monte Carlo simulation method. Based on the simulation model, the experimental parameters for bridged foil plasma imaging were determined; The experimental parameters include: X-ray source type, laser power density, X-ray energy point, bridge foil thickness, substrate material, substrate thickness, and imaging parameters; the substrate material is CH material; the substrate thickness is 0.5 mm; the bridge foil thickness is less than or equal to 8 μm. Based on the experimental parameters, an experimental model for bridged foil plasma imaging was established. The experimental model includes an X-ray source, a bridged foil, a substrate, and a detector. The model also includes a shielding cone located between a strong magnet and the detector, with the cone angle determined by the imaging receiving solid angle of the detector. The shielding cone is used to shield stray X-rays and high-energy particles between the strong magnet and the detector. The X-ray source generates X-rays and includes a laser generator, an off-axis parabolic mirror, and a target nozzle. The laser generator generates a laser beam. The off-axis parabolic mirror focuses the laser beam to obtain a point source. The target nozzle ejects a target material. The point source interacts with the target material to generate X-rays. The target material is a gas target or a microfilament target. The bridged foil is located on the substrate. The bridged foil is used for electro-explosion to form bridged foil plasma. The detector detects X-rays passing through the bridged foil to image the bridged foil plasma. Using the experimental model, a photographic experiment was conducted on the plasma process driven by the electric explosion device to obtain dynamic images of the bridged foil plasma.

2. The bridge foil plasma process see-through photography method of claim 1, wherein, Also includes: Obtain the current curve of the plasma process driven by the electro-explosive device; Based on the current curve, determine the diagnostic timing of the diagnostic plasma process; The evolution of the bridge foil plasma is determined based on the dynamic images and the diagnostic time.

3. The bridge foil plasma process see-through photography method of claim 1, wherein, The experimental model also includes: a strong magnet; the strong magnet is located between the bridge foil and the detector; the strong magnet is used to generate a magnetic field to deflect high-energy electrons between the bridge foil and the detector from the imaging direction of X-rays.

4. The bridge foil plasma process see-through photography method of claim 1, wherein, The X-ray source is a Betatron radiation source driven by a femtosecond laser or a picosecond laser; the size of the X-ray source is on the microsecond scale; the laser power density is greater than or equal to 10¹⁸ W / cm²; and the X-ray energy point is greater than 10 keV.

5. A bridge foil plasma process scopy system characterized by, include: The simulation modeling module is used to establish a simulation model of bridged foil plasma imaging using the Monte Carlo simulation method; The parameter determination module is used to determine the experimental parameters for bridged foil plasma imaging based on the simulation model. The experimental parameters include: X-ray source type, laser power density, X-ray energy point, bridge foil thickness, substrate material, substrate thickness, and imaging parameters; the substrate material is CH material; the substrate thickness is 0.5 mm; the bridge foil thickness is less than or equal to 8 μm; the experimental construction module is used to establish an experimental model of bridge foil plasma imaging based on the experimental parameters; the experimental model includes: X-ray source, bridge foil, substrate, and detector; the experimental model also includes: a shielding cone; the shielding cone is located between the strong magnet and the detector, and the cone angle of the shielding cone is determined by the imaging receiving solid angle of the detector; the shielding cone is used to shield the strong magnet. Stray X-rays and high-energy particles between the magnet and the detector; the X-ray source is used to generate X-rays; the X-ray source includes: a laser generator, an off-axis parabolic mirror, and a target nozzle; the laser generator is used to generate a laser beam; the off-axis parabolic mirror is used to focus the laser beam to obtain a point source; the target nozzle is used to eject a target; the point source interacts with the target to generate X-rays; the target is a gas target or a microfilament target; the bridge foil is located on the substrate; the bridge foil is used for electro-explosion to form bridge foil plasma; the detector is used to detect X-rays passing through the bridge foil to image the bridge foil plasma; The dynamic photography module is used to conduct photographic experiments on the plasma process driven by the electric explosion device using the experimental model, and to obtain dynamic images of the bridged foil plasma.

6. An electronic device, comprising: The device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the bridged foil plasma process radiography method as described in any one of claims 1 to 4.

7. A computer readable storage medium characterized in that, It stores a computer program that, when executed by a processor, implements the bridge foil plasma process radiography method as described in any one of claims 1 to 4.

Images