A multi-moment diagnostic method, device, equipment, and medium for two-dimensional distribution of plasma electron temperature based on X-ray zone plate arrays.

Abstract

This invention discloses a method, apparatus, device, and medium for multi-moment diagnosis of two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array. The method includes: acquiring two X-ray coded images at the same time; reconstructing the X-ray coded images using a coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; constructing a correspondence between the intensity ratio of the two high-resolution X-ray intensity images at the same location and the electron temperature based on the working principle of the multi-channel filter method; determining the two-dimensional distribution information of the electron temperature at that moment based on several correspondences, and extending it to multi-moment data of the two-dimensional distribution of electron temperature. This invention belongs to the field of plasma electron temperature diagnosis. This invention can improve light collection efficiency and spatial resolution.

Description

Technical Field

[0001] This invention relates to the field of plasma electron temperature diagnostics, and more particularly to a method, apparatus, equipment, and medium for multi-moment diagnostics of two-dimensional distribution of plasma electron temperature based on X-ray zone plate arrays. Background Technology

[0002] High-temperature plasma electron temperature diagnostics is a core technology in plasma physics research. It can acquire key experimental data on electron temperature, supporting research on the energy coupling and dynamic evolution of laser-matter interactions. It has wide applications in inertial confinement fusion, high-energy-density physics, and laboratory astrophysics. As the primary carrier of plasma energy transfer, the temperature of electrons directly determines plasma ionization, thermal conduction, and instability development. High-temperature plasmas exhibit transient and unsteady-state characteristics, with dramatic spatiotemporal changes in electron temperature, exhibiting both rapid temporal evolution and significant two-dimensional spatial distribution.

[0003] Existing technologies use pinhole arrays to measure the two-dimensional distribution of spatial information and X-ray framing cameras to acquire multi-time data of temporal information. However, because their multi-channel imaging process relies on pinhole imaging systems, they suffer from drawbacks such as low light collection efficiency and low spatial resolution. Therefore, there is an urgent need to provide a multi-time diagnostic method for the two-dimensional distribution of plasma electron temperature based on X-ray zone plate arrays to overcome these shortcomings. Summary of the Invention

[0004] This invention provides a method, apparatus, device, and medium for multi-moment diagnosis of two-dimensional distribution of plasma electron temperature based on X-ray zone plate arrays. It solves the technical problems of low light collection efficiency and low spatial resolution of data obtained by relying solely on pinhole imaging systems in the prior art, and achieves the technical effect of improving the light collection efficiency and spatial resolution of the data.

[0005] In a first aspect, the present invention provides a multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array, comprising: Two X-ray coded images of the same signal at the same time were acquired, and the two X-ray coded images were captured by a zone plate coded imaging system with different filter parameters; The X-ray coded images are reconstructed using an coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; Based on the working principle of the multi-channel filter method, a correlation between the intensity ratio of two high-resolution X-ray intensity images at the same location and the electron temperature was constructed. The two-dimensional distribution information of electron temperature at a given moment is determined based on several correspondences, and then extended to multi-moment data of the two-dimensional distribution of electron temperature. The multi-moment data of the two-dimensional distribution of electron temperature is used to analyze the dynamic evolution process of electron temperature.

[0006] Furthermore, multi-time data on the two-dimensional distribution of electron temperature were obtained, including: By adding a zone plate coded imaging system to the same microchannel plate microstrip, two-dimensional distribution information of electron temperature at multiple time points can be obtained; The two-dimensional distribution information of electron temperature at multiple times is collected into multi-time data of the two-dimensional distribution of electron temperature.

[0007] Furthermore, the correspondence between the intensity ratio and electron temperature at the same location was determined, including:

[0008] in, For strength ratio, This is the integral signal quantity of the first high-resolution X-ray intensity image. This is the integral signal quantity of the second high-resolution X-ray intensity image. X-ray transmittance of the X-ray zone plate; The X-ray energy spectrum response curve of MCP is shown. This represents the bremsstrahlung spectrum of high-temperature plasma. This represents the X-ray transmittance of the first filter parameter, which corresponds to the first X-ray coded image. This represents the X-ray transmittance of the second filter parameter, which corresponds to the second X-ray encoded image.

[0009] Furthermore, it also includes: The correspondence between the bremsstrahlung spectrum and electron temperature of high-temperature plasma includes:

[0010] in, The plasma electron temperature, For electron number density, Photon energy.

[0011] Furthermore, the X-ray coded images are reconstructed using Wiener filtering to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image, including: A linear displacement-invariant system model was constructed, and the point spread function of the system was determined by a pinhole experiment. The X-ray encoded image and the point spread function are subjected to Fourier transform, and then processed by Wiener filtering and inverse transform to obtain a preliminary reconstructed image; By using frequency domain filtering and determining the regularization parameter K value based on the relative error method, the preliminary reconstructed image is optimized to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image.

[0012] Furthermore, the X-ray coded images are reconstructed through optical simulation to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image, including: A physical simulation model of the zone plate coded imaging system is constructed, and an ideal coded image corresponding to the X-ray coded image is obtained based on the wave optics principle. The ideal encoded image is decoded based on an iterative reconstruction algorithm or a deep learning network, and the image parameters of the reconstructed ideal encoded image are optimized by minimizing the error between the simulation and the measured image to obtain the corresponding high-resolution X-ray intensity image.

[0013] Furthermore, by reconstructing the X-ray coded images using compressed sensing, a high-resolution X-ray intensity image corresponding to each X-ray coded image is obtained, including: Construct a sparse representation model for X-ray encoded images; Determine the sensing matrix and equidistant measurement matrix corresponding to the sparse representation model; The sparse representation model is reconstructed by orthogonal matching pursuit, with total variational regularization introduced during the reconstruction process; The reconstructed sparse representation model is solved using the alternating direction multiplier method, and the corresponding high-resolution X-ray intensity image is obtained.

[0014] Secondly, the present invention provides a multi-moment diagnostic device for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array, comprising: The acquisition module is used to acquire two X-ray coded images of the same signal at the same time, wherein the two X-ray coded images are captured by a zone plate coded imaging system with different filter parameters; The reconstruction module is used to reconstruct X-ray coded images using an coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; The relationship determination module is used to construct the correspondence between the intensity ratio and electron temperature of two high-resolution X-ray intensity images at the same location based on the working principle of the multi-channel filter method. The data acquisition module is used to determine the two-dimensional distribution information of electron temperature at a given moment based on several correspondences, and to expand it into multi-moment data of the two-dimensional distribution of electron temperature. The multi-moment data of the two-dimensional distribution of electron temperature is used to analyze the dynamic evolution process of electron temperature.

[0015] Thirdly, the present invention provides an electronic device, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to execute a multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array, as provided in the first aspect.

[0016] Fourthly, the present invention provides a non-transitory computer-readable storage medium, wherein when the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is able to execute a multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array as provided in the first aspect.

[0017] One or more technical solutions provided in this invention have at least the following technical effects or advantages: This invention utilizes a zone plate coded imaging system with different filter parameters to simultaneously acquire two X-ray coded images at the same time. A high-resolution X-ray intensity image is obtained by combining the coded image reconstruction algorithm. Furthermore, a multi-channel filter method is used to establish the correspondence between the intensity ratio and electron temperature. This not only accurately retrieves the two-dimensional spatial distribution of plasma electron temperature at that moment but also extends it to form multi-time series data to analyze its dynamic evolution. Overall, it possesses advantages such as high spatial resolution, reliable temperature diagnosis accuracy, and good spatiotemporal information synchronization. Simultaneously, by combining zone plate coded imaging with multiple filters, it achieves efficient, real-time, and multi-time continuous diagnosis of the two-dimensional distribution of plasma electron temperature, clearly reflecting the spatiotemporal evolution of temperature and providing comprehensive and accurate diagnostic support for plasma physics process research.

[0018] This invention differs from existing technologies that use pinhole arrays to obtain X-ray intensity images of plasma passing through different filters at different times using electron temperature diagnostic techniques. This invention first utilizes a zone plate array to obtain coded X-ray images of plasma passing through different filters at different times. Then, a high-resolution X-ray intensity image is obtained through a coding reconstruction algorithm. By comparing the intensity ratios at the same location in the intensity images passing through different filters at the same time, the two-dimensional spatial distribution information of electron temperature is deduced. This invention provides another practical and feasible technical approach for multi-time-series diagnosis of the two-dimensional electron temperature distribution of high-temperature plasma, and can effectively improve light collection efficiency by at least two orders of magnitude and spatial resolution by at least one order of magnitude. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic flowchart of the multi-moment diagnosis method for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array provided by the present invention; Figure 2A schematic diagram illustrating the working principle of the multi-moment diagnostic technology for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array provided by the present invention. Figure 3 This is a schematic diagram of the structural parameters of the X-ray zone plate array provided by the present invention; Figure 4 A schematic diagram of the structural parameters of the MCP microstrip provided by this invention; Figure 5 The energy response curve of the X-ray zone plate provided by this invention; Figure 6 The energy response curve of the filter provided by the present invention; Figure 7 The energy response curve of the MCP microstrip provided by this invention; Figure 8 This is a schematic diagram illustrating the relationship between the intensity ratio of an X-ray image at the same location and the electron temperature, provided by the present invention. Detailed Implementation

[0021] This invention provides a multi-moment diagnostic method for the two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array, which solves the technical problems of low light collection efficiency and low spatial resolution in the prior art that relies solely on pinhole imaging systems.

[0022] The technical solution of this invention is to solve the above-mentioned technical problems, and the overall idea is as follows: A multi-moment diagnostic method for the two-dimensional distribution of plasma electron temperature based on X-ray zone plate arrays includes: acquiring two X-ray coded images at the same time, wherein the two X-ray coded images are captured by a zone plate coded imaging system with different filter parameters; reconstructing the X-ray coded images using a coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; constructing a correspondence between the intensity ratio of the two high-resolution X-ray intensity images at the same location and the electron temperature based on the working principle of the multi-channel filter method; determining the two-dimensional distribution information of electron temperature at that moment based on several correspondences, and extending it into multi-moment data of the two-dimensional distribution of electron temperature, wherein the multi-moment data of the two-dimensional distribution of electron temperature is used to analyze the dynamic evolution process of electron temperature.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0025] This invention provides, for example Figure 1 The illustrated method for multi-moment diagnosis of two-dimensional plasma electron temperature distribution based on X-ray zone plate array includes steps S11-S14. A schematic diagram of the principle of this invention can be found in the following reference. Figure 2 : Step S11: Acquire two X-ray coded images of the same signal at the same time, wherein the two X-ray coded images are captured by a zone plate coded imaging system with different filter parameters.

[0026] At the same time, high-temperature plasma is observed synchronously through two independent zone plate coded imaging systems.

[0027] Both systems can employ zone plate coded imaging technology (to improve spatial resolution), and the two zone plate coded imaging systems are equipped with filters with different parameters (e.g., different thicknesses or materials).

[0028] Because different filters have different transmittance for X-ray energy spectrum, the two systems can capture the response of the same physical process in different energy bands, thereby obtaining two X-ray encoded images with energy spectrum differences.

[0029] The X-ray zone plate used can be either a Fresnel zone plate or a Gabor zone plate.

[0030] Fresnel zone plates consist of a series of concentric rings with alternating bright and dark areas, whose radii increase according to a specific pattern. They achieve focusing by blocking odd or even half-wave zones, causing the transmitted light to undergo coherent constructive phase at the focal point.

[0031] The transmittance function of a Gabor zone plate exhibits a sinusoidal variation. Gabor zone plates possess single-stage focusing characteristics, meaning that energy is primarily concentrated at a single principal focus, effectively suppressing higher-order diffraction focal points and background noise.

[0032] Step S12: The X-ray coded images are reconstructed using a coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image. 【1】 The X-ray coded images are reconstructed using Wiener filtering to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image. This process includes: constructing a linear displacement-invariant system model and determining the system's point spread function through a pinhole experiment; performing Fourier transform on the X-ray coded images and the point spread function, followed by Wiener filtering and inverse transform processing to obtain a preliminary reconstructed image; and optimizing the preliminary reconstructed image by frequency domain filtering and determining the regularization parameter K value based on the relative error method to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image.

[0034] Specifically: First, a linear displacement-invariant system model is constructed as the mathematical basis for reconstruction. This model assumes that X-rays satisfy linear superposition and spatial displacement invariance during encoding, imaging and transmission. That is, signals at different positions of the object undergo only linear changes in amplitude and phase after passing through the imaging system, without producing nonlinear distortion. Then, the point spread function of the system is accurately determined through a pinhole scanning experiment. Using a tiny pinhole as an ideal point light source, the response image formed after passing through the imaging system is collected. This response image is the point spread function that characterizes the blurring, scattering and distortion characteristics of the system imaging, providing key prior information about system transmission for subsequent inverse filtering reconstruction. Two-dimensional Fourier transforms are performed on the acquired X-ray encoded image and the measured point spread function to convert the image signal in the spatial domain to the frequency domain. In the frequency domain, the Wiener filter operator is substituted, and combined with the prior assumptions of the system transfer function and noise power spectrum, the noise amplification is suppressed and the image degradation effect caused by the encoding process is canceled. After completing the frequency domain filtering, the image is converted back to the spatial domain by inverse Fourier transform to obtain the preliminary reconstructed image. Image optimization is achieved by combining frequency domain fine-tuning filtering with the relative error method. In the frequency domain, residual high-frequency noise and pseudo-frequency interference are further removed. At the same time, with the goal of minimizing the relative error between the reconstructed image and the real reference signal, the key regularization parameter K value in Wiener filtering is determined by iterative optimization. This parameter can balance the degree of image restoration and the noise suppression effect, and avoid excessive noise amplification in the inverse process, so as to obtain a high signal-to-noise ratio and high spatial resolution X-ray intensity image corresponding to each X-ray coded image. 【2】 The X-ray coded images are reconstructed through optical simulation to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image. This includes: constructing a physical simulation model corresponding to the zone plate coded imaging system, and obtaining the ideal coded image corresponding to the X-ray coded image based on the wave optics principle; decoding the ideal coded image based on an iterative reconstruction algorithm or a deep learning network, and optimizing the image parameters of the reconstructed ideal coded image by minimizing the error between the simulation and the measured image to obtain the corresponding high-resolution X-ray intensity image.

[0036] Specifically: Based on the actual structure and operating parameters of the zone plate coded imaging system, a physical simulation model that perfectly matches it is constructed. This model accurately reproduces key physical elements such as the diffraction characteristics of the zone plate, X-ray propagation path, detector response, and system geometry. Numerical simulation calculations are carried out based on the wave optics principle to simulate the complete physical process of X-rays passing through zone plates, propagating and being received, thereby obtaining an ideal coded image corresponding to the actual acquired X-ray coded image. This ideal image eliminates measured noise, system strays and distortion interference caused by non-ideal devices. An iterative reconstruction algorithm or a pre-trained deep learning network is selected as the core decoding tool to perform inverse encoding on the above-mentioned ideal encoded image. The encoded information modulated by the zone plate is reversed to restore the original high-resolution spatial distribution. In this process, the grayscale difference and structural error between the ideal encoded image generated by simulation and the real encoded image obtained by actual experiment are used as optimization targets. By continuously adjusting the image parameters, system parameters or network weights in the reconstruction process, the error between the simulation result and the measured image is continuously minimized, so that the reconstruction result conforms to the physical simulation law and is close to the real imaging situation. Thus, the high-resolution X-ray intensity image corresponding to each original X-ray encoded image is obtained. 【3】 Reconstructing X-ray coded images using compressed sensing yields high-resolution X-ray intensity images for each image. This process includes: constructing a sparse representation model for the X-ray coded image; determining the sensing matrix and equidistant measurement matrix corresponding to the sparse representation model; reconstructing the sparse representation model using orthogonal matching pursuit, with total variational regularization introduced during the reconstruction process; and solving the reconstructed sparse representation model using the alternating direction multiplier method to obtain the corresponding high-resolution X-ray intensity image.

[0038] Specifically: First, based on the signal characteristics of the X-ray image, a sparse representation model suitable for the encoded image is constructed, so that the original high-resolution image can be expressed with a small number of non-zero coefficients under a sparse basis. By combining the coded observation mechanism of the imaging system, the sensing matrix corresponding to the sparse model is determined, and an equidistant measurement matrix that satisfies the constrained equidistant characteristics is constructed to ensure that the coded measurement process can effectively preserve the information of the original signal. An orthogonal matching pursuit algorithm is used to iteratively reconstruct the sparse representation model. At the same time, total variation regularization constraints are added during the reconstruction process to suppress noise and artifacts and preserve image edge details. The alternating direction multiplier method is used to solve the sparse reconstruction optimization problem with regularization terms. A stable and accurate solution is obtained through iterative optimization, and finally the reconstruction from X-ray encoded image to high-resolution X-ray intensity image is completed.

[0039] Step S13: Based on the working principle of the multi-channel filter method, construct the correspondence between the intensity ratio and electron temperature of two high-resolution X-ray intensity images at the same location; When high-temperature plasma is dominated by bremsstrahlung radiation, the intensity ratio of two X-ray images taken at the same time using different filters satisfies the following relationship with the plasma electron temperature:

[0040] in, For strength ratio, This is the integral signal quantity of the first high-resolution X-ray intensity image. This is the integral signal quantity of the second high-resolution X-ray intensity image. X-ray transmittance of the X-ray zone plate; The X-ray energy spectrum response curve of MCP is shown. This represents the bremsstrahlung spectrum of high-temperature plasma. This represents the X-ray transmittance of the first filter parameter, which corresponds to the first X-ray coded image. This represents the X-ray transmittance of the second filter parameter, which corresponds to the second X-ray encoded image.

[0041] In a certain experiment, assuming the light-blocking portion of the X-ray zone plate is a 1μm thick gold film, filter 1 is a 1μm thick aluminum film, and filter 2 is a 2μm thick aluminum film, then... , , and The energy spectrum response characteristics are as follows Figure 5 , 6 And as shown in 7.

[0042] This also includes: the correspondence between the bremsstrahlung spectrum and electron temperature of high-temperature plasma, including:

[0043] in, The plasma electron temperature, For electron number density, Photon energy.

[0044] The above formula provides the relationship between the intensity ratio of the same location in two images and the plasma electron temperature. The calculation results of a certain experiment are as follows Figure 8 As shown. Figure 8 As shown, with this filter combination, the inverse algorithm exhibits high accuracy in the electron temperature range of 100 eV to 350 eV, but its accuracy decreases significantly with increasing electron temperature. Therefore, the filter combination can be designed based on the electron temperature range of the plasma to be measured.

[0045] Step S14: Determine the two-dimensional distribution information of electron temperature at this moment based on several correspondences, and expand it into multi-moment data of the two-dimensional distribution of electron temperature. The multi-moment data of the two-dimensional distribution of electron temperature is used to analyze the dynamic evolution process of electron temperature.

[0046] The method extends the acquisition of multi-moment data of the two-dimensional electron temperature distribution, including: adding a zone plate coding imaging system to the same microchannel plate microstrip to obtain two-dimensional electron temperature distribution information at multiple moments; and combining the two-dimensional electron temperature distribution information at multiple moments into multi-moment data of the two-dimensional electron temperature distribution.

[0047] Step S14 aims to obtain the two-dimensional distribution information of electron temperature at the current moment by solving several established correspondences, and further expand it to form time series data of two-dimensional distribution of electron temperature covering multiple moments, so as to analyze the dynamic evolution law and spatiotemporal evolution characteristics of electron temperature over time. By adding a zone plate coded imaging system based on the same microchannel plate microstrip structure, multiple imaging detections and inversion calculations are performed at continuous or different time points using this imaging system. The two-dimensional spatial distribution information of electron temperature at each corresponding time point is obtained. The two-dimensional distribution information of electron temperature obtained at different time points is integrated, arranged and stored in chronological order to form a complete multi-time dataset of two-dimensional electron temperature distribution. This time-series dataset can intuitively reflect the spatial distribution differences of electron temperature and its changing trend over time, providing key data support for subsequent analysis of the dynamic evolution process of electron temperature in physical fields such as plasma, and revealing its spatiotemporal evolution law and physical mechanism.

[0048] The following provides further explanation of some parameters and steps: In this experiment, the zone plate array structure was 4×4, with a horizontal spacing of 3.2 mm and a vertical spacing of 3.0 mm. The zone plates were Fresnel zone plates with a diameter of 200 μm and an outermost ring width of 1 μm. Figure 3 As shown; The microchannel plate contains a total of 4 microstrips, each 12mm wide, with a spacing of 4mm between them. Figure 4 As shown; The object distance for the zone plate coded imaging system is 200 mm, and the image distance is 800 mm. Since the zone plate diameter is 200 μm, the light-gathering area is 100 times larger than that of the existing 20 μm pinhole array. Furthermore, because the spatial resolution of zone plate coded imaging is comparable to the width of the outermost ring of the zone plate, while the spatial resolution of pinhole imaging is comparable to the pinhole diameter, the spatial resolution of multi-moment diagnosis of the two-dimensional distribution of plasma electron temperature using a zone plate array is approximately 20 times higher than that of the existing 20 μm pinhole array.

[0049] In summary, this invention simultaneously acquires two X-ray coded images at the same time using a zone plate coded imaging system with different filter parameters. Combined with a coded image reconstruction algorithm, a high-resolution X-ray intensity image is obtained. Furthermore, relying on a multi-channel filter method to establish the correspondence between intensity ratio and electron temperature, it can not only accurately invert the two-dimensional spatial distribution of plasma electron temperature at that moment, but also further expand to form multi-time series data to analyze its dynamic evolution process. Overall, it possesses the advantages of high spatial resolution, reliable temperature diagnosis accuracy, and good spatiotemporal information synchronization. Simultaneously, by combining zone plate coded imaging with multiple filters, it achieves efficient, real-time, and multi-time continuous diagnosis of the two-dimensional distribution of plasma electron temperature, clearly reflecting the spatiotemporal evolution law of temperature, and providing comprehensive and accurate diagnostic support for the study of plasma physics processes.

[0050] This invention differs from existing technologies that use pinhole arrays to obtain X-ray intensity images of plasma passing through different filters at different times using electron temperature diagnostic techniques. This invention first utilizes a zone plate array to obtain coded X-ray images of plasma passing through different filters at different times. Then, a high-resolution X-ray intensity image is obtained through a coding reconstruction algorithm. By comparing the intensity ratios at the same location in the intensity images passing through different filters at the same time, the two-dimensional spatial distribution information of electron temperature is deduced. This invention provides another practical and feasible technical approach for multi-time-series diagnosis of the two-dimensional electron temperature distribution of high-temperature plasma, and can effectively improve light collection efficiency by at least two orders of magnitude and spatial resolution by at least one order of magnitude.

[0051] Based on the same inventive concept, a multi-moment diagnostic device for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array includes: The acquisition module is used to acquire two X-ray coded images of the same signal at the same time, wherein the two X-ray coded images are captured by a zone plate coded imaging system with different filter parameters; The reconstruction module is used to reconstruct X-ray coded images using an coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; The relationship determination module is used to construct the correspondence between the intensity ratio and electron temperature of two high-resolution X-ray intensity images at the same location based on the working principle of the multi-channel filter method. The data acquisition module is used to determine the two-dimensional distribution information of electron temperature at a given moment based on several correspondences, and to expand it into multi-moment data of the two-dimensional distribution of electron temperature. The multi-moment data of the two-dimensional distribution of electron temperature is used to analyze the dynamic evolution process of electron temperature.

[0052] Based on the same inventive concept, the present invention also provides an electronic device, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to execute a multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array, as described above.

[0053] Based on the same inventive concept, the present invention also provides a non-transitory computer-readable storage medium, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to execute the multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array as described above.

[0054] Since the electronic device described in this embodiment is an electronic device used to implement the information processing method in the embodiments of the present invention, those skilled in the art can understand the specific implementation methods and various variations of the electronic device in this embodiment based on the information processing method described in the embodiments of the present invention. Therefore, how the electronic device implements the method in the embodiments of the present invention will not be described in detail here. Any electronic device used by those skilled in the art to implement the information processing method in the embodiments of the present invention falls within the scope of protection of the present invention.

[0055] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0056] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0057] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0058] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0059] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0060] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for diagnosing a two-dimensional distribution of plasma electron temperature at multiple times based on an X-ray waveband sheet array, characterized by, include: Two X-ray coded images of the same signal at the same time were acquired, and the two X-ray coded images were captured by a zone plate coded imaging system with different filter parameters; The X-ray coded images are reconstructed using an coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; Based on the working principle of the multi-channel filter method, the correspondence between the intensity ratio and electron temperature of two high-resolution X-ray intensity images at the same location was constructed. The two-dimensional distribution information of electron temperature at a given moment is determined based on several correspondences, and this is expanded into multi-moment data of the two-dimensional distribution of electron temperature. This multi-moment data is used to analyze the dynamic evolution of electron temperature. Determining the correspondence between the intensity ratio and electron temperature at the same location includes: in, For strength ratio, This is the integral signal quantity of the first high-resolution X-ray intensity image. This is the integral signal quantity of the second high-resolution X-ray intensity image. X-ray transmittance of the X-ray zone plate; The X-ray energy spectrum response curve of MCP is shown. This represents the bremsstrahlung spectrum of high-temperature plasma. This represents the X-ray transmittance of the first filter parameter, which corresponds to the first X-ray coded image. The X-ray transmittance of the second filter parameter, which corresponds to the second X-ray coded image, also includes: The correspondence between the bremsstrahlung spectrum and electron temperature of high-temperature plasma includes: in, The plasma electron temperature, For electron number density, Photon energy.

2. The multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array as described in claim 1, characterized in that, The extended data yielded multi-timeframe data of the two-dimensional electron temperature distribution, including: By adding a zone plate coded imaging system to the same microchannel plate microstrip, two-dimensional distribution information of electron temperature at multiple time points can be obtained; The two-dimensional distribution information of electron temperature at multiple times is collected into multi-time data of the two-dimensional distribution of electron temperature.

3. The multi-moment diagnostic method for two-dimensional plasma electron temperature distribution based on X-ray zone plate array as described in claim 1, characterized in that, The X-ray coded images are reconstructed using Wiener filtering to obtain high-resolution X-ray intensity images corresponding to each X-ray coded image, including: A linear displacement-invariant system model was constructed, and the point spread function of the system was determined by a pinhole experiment. The X-ray encoded image and the point spread function are subjected to Fourier transform, and then processed by Wiener filtering and inverse transform to obtain a preliminary reconstructed image; By using frequency domain filtering and determining the regularization parameter K value based on the relative error method, the preliminary reconstructed image is optimized to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image.

4. The multi-moment diagnostic method for two-dimensional plasma electron temperature distribution based on X-ray zone plate array as described in claim 1, characterized in that, X-ray coded images are reconstructed using optical simulation to obtain high-resolution X-ray intensity images corresponding to each X-ray coded image, including: A physical simulation model of the zone plate coded imaging system is constructed, and an ideal coded image corresponding to the X-ray coded image is obtained based on the wave optics principle. The ideal encoded image is decoded based on an iterative reconstruction algorithm or a deep learning network, and the image parameters of the reconstructed ideal encoded image are optimized by minimizing the error between the simulation and the measured image to obtain the corresponding high-resolution X-ray intensity image.

5. The multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array as described in claim 1, characterized in that, By reconstructing the X-ray coded images using compressed sensing, a high-resolution X-ray intensity image corresponding to each X-ray coded image is obtained, including: Construct a sparse representation model for X-ray encoded images; Determine the sensing matrix and equidistant measurement matrix corresponding to the sparse representation model; The sparse representation model is reconstructed by orthogonal matching pursuit, with total variational regularization introduced during the reconstruction process; The reconstructed sparse representation model is solved using the alternating direction multiplier method, and the corresponding high-resolution X-ray intensity image is obtained.

6. A multi-moment diagnostic device for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array, characterized in that, The method for multi-moment diagnosis of two-dimensional plasma electron temperature distribution based on X-ray zone plate array, applicable to any one of claims 1-5, includes: The acquisition module is used to acquire two X-ray coded images of the same signal at the same time, wherein the two X-ray coded images are captured by a zone plate coded imaging system with different filter parameters; The reconstruction module is used to reconstruct X-ray coded images using an coded image reconstruction algorithm to obtain a high-resolution X-ray intensity image corresponding to each X-ray coded image; The relationship determination module is used to construct the correspondence between the intensity ratio and electron temperature of two high-resolution X-ray intensity images at the same location based on the working principle of the multi-channel filter method. The data acquisition module is used to determine the two-dimensional distribution information of electron temperature at a given moment based on several correspondences, and to expand it into multi-moment data of the two-dimensional distribution of electron temperature. The multi-moment data of the two-dimensional distribution of electron temperature is used to analyze the dynamic evolution process of electron temperature.

7. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute a multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on an X-ray zone plate array, as described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor of the electronic device, the electronic device is able to perform the multi-moment diagnostic method for two-dimensional distribution of plasma electron temperature based on X-ray zone plate array as described in any one of claims 1 to 5.

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