Laser fusion cross-scale simulation method, system and terminal based on relay computing

Abstract

The present invention provides a laser fusion cross-scale simulation method, system, and terminal based on relay computing. The method utilizes a radiation fluid program to simulate the nanosecond laser-driven fuel implosion collision process, obtaining the post-collision plasma temperature and density distribution. A particle kinetics program is used to simulate the picosecond laser-driven fast electron generation process, obtaining the fast electron beam distribution in phase space. The obtained post-collision plasma temperature and density distribution, as well as the fast electron beam distribution in phase space, are then input into a hybrid kinetics program to simulate the fast electron beam heating process of the colliding plasma, obtaining the colliding plasma heating results. The radiation fluid program is then used to simulate the fusion combustion process based on the colliding plasma heating results, obtaining the neutron yield and fusion energy gain. The present invention utilizes numerical simulation methods at different physical scales to calculate the corresponding physical processes, and couples these different physical processes for relay computing, achieving cross-scale simulation of laser fusion schemes while ensuring controllable computational accuracy and computational complexity.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power generation, and in particular to a laser fusion cross-scale simulation method, system and terminal based on relay computing. Background Art

[0002] With the advent of the ruby ​​laser in 1960, Nuckolls of the United States and Wang Ganchang of my country independently proposed the idea of ​​using lasers to achieve controlled nuclear fusion. In 2022, the National Ignition Facility (NIF) in the United States achieved for the first time a net gain in fusion output energy exceeding the laser input energy. However, the indirect drive central ignition scheme used by the NIF presents physical difficulties such as low energy efficiency and high fluid instabilities, making it difficult to achieve a high enough fusion gain for clean energy.

[0003] To address these two major physical difficulties, Chinese scientist Academician Zhang Jie, based on the latest scientific and technological achievements, proposed in 2018 a double-cone collision ignition scheme that separates compression and heating. This scheme combines the advantages of high-energy nanosecond laser fuel compression with ultra-high-intensity picosecond laser fuel heating using fast electrons. This effectively suppresses fluid instabilities during compression and improves energy coupling efficiency and fusion gain potential. However, the double-cone collision ignition scheme involves a wide range of physical processes, from relativistic laser-plasma interactions at the femtosecond micrometer scale dominated by electromagnetic fields and particle collisions to implosion collisions at the nanosecond millimeter scale dominated by fluid effects. Numerical simulation of the entire process is extremely difficult. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a laser fusion cross-scale simulation method, system and terminal based on relay calculation, which is used to solve the technical problem that the prior art lacks a cross-scale simulation scheme that can realize laser fusion schemes such as double-cone collision ignition schemes.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a laser fusion cross-scale simulation method based on relay computing, the method comprising: using a radiation fluid program to simulate a nanosecond laser-driven fuel implosion collision process, and obtaining the plasma temperature and density distribution after the collision; using a particle kinetics program to simulate a picosecond laser-driven fast electron generation process, and obtaining the distribution of the fast electron beam in the phase space; using a hybrid kinetics program to simulate the fast electron beam heating process of the colliding plasma based on the plasma temperature and density distribution after the collision, and the distribution of the fast electron beam in the phase space, and obtaining the colliding plasma heating results; using a radiation fluid program to simulate the fusion combustion process based on the colliding plasma heating results, and obtaining the neutron yield and fusion energy gain.

[0006] In one embodiment of the present invention, the use of a radiation fluid program to simulate a nanosecond laser-driven fuel implosion collision process and obtain a post-collision plasma temperature and density distribution includes: using a two-dimensional radiation fluid program to calculate the nanosecond laser-driven fuel implosion collision process based on the set ablation layer, fuel, gold cone structure, and geometric parameters and power waveform of the nanosecond laser, obtain the post-collision plasma temperature and density distribution, and convert them into a file format required by the hybrid dynamics program.

[0007] In one embodiment of the present invention, the use of a particle kinetics program to simulate the fast electron generation process driven by a picosecond laser and obtain the distribution of the fast electron beam in the phase space includes: using the particle kinetics program to calculate the fast electron generation process driven by the picosecond laser based on the energy, focal spot and pulse width provided by the laser device, obtaining the distribution of the fast electron beam in the phase space, and converting it into the file format required by the hybrid dynamics program.

[0008] In one embodiment of the present invention, the method of simulating the fast electron beam heating process of the colliding plasma using a hybrid kinetics program based on the post-collision plasma temperature and density distribution and the distribution of the fast electron beam in phase space, and obtaining the colliding plasma heating results, includes: inputting the post-collision plasma temperature and density distribution calculated and converted by a two-dimensional radiation fluid program, and the fast electron beam distribution in phase space calculated and converted by a particle kinetics program, into the hybrid kinetics program, calculating the fast electron beam heating process of the colliding plasma, obtaining the colliding plasma heating results, and converting them into the file format required by the three-dimensional radiation fluid program; the colliding plasma heating results include: the temperature and density distribution after the colliding plasma heating.

[0009] In one embodiment of the present invention, the use of a radiation fluid program to simulate the fusion combustion process based on the colliding plasma heating results to obtain the neutron yield and fusion energy gain includes: using a three-dimensional radiation fluid program to calculate the fusion combustion process based on the colliding plasma heating results calculated and converted by a hybrid kinetics program to obtain the neutron yield and fusion energy gain.

[0010] In one embodiment of the present invention, the KLAPS particle simulation program is used to calculate the fast electron generation process driven by a picosecond laser to obtain the distribution of the fast electron beam in the phase space.

[0011] In one embodiment of the present invention, the magnetic field distribution after the colliding plasma heating is format-converted together with the calculated temperature and density distribution after the colliding plasma heating and then input into a three-dimensional radiation fluid program to calculate the fusion combustion process.

[0012] In one embodiment of the present invention, the collision plasma heating result also includes: the magnetic field distribution after the collision plasma heating, which is format-converted together with the calculated temperature and density distribution after the collision plasma heating and input into the three-dimensional radiation fluid program to calculate the fusion combustion process.

[0013] To achieve the above-mentioned and other related objectives, the present invention provides a laser fusion cross-scale simulation system based on relay computing, the system comprising: a nanosecond laser-driven fuel implosion collision process simulation module, configured to simulate the nanosecond laser-driven fuel implosion collision process using a radiation fluid program and obtain the temperature and density distribution of the plasma after the collision; a picosecond laser-driven fast electron generation process simulation module, configured to simulate the picosecond laser-driven fast electron generation process using a particle kinetics program and obtain the distribution of the fast electron beam in phase space; a fast electron beam heating collision plasma process simulation module, connected to the nanosecond laser-driven fuel implosion collision process simulation module and the picosecond laser-driven fast electron generation process simulation module, configured to simulate the fast electron beam heating collision plasma process using a hybrid kinetics program based on the temperature and density distribution of the plasma after the collision and the distribution of the fast electron beam in phase space, and obtain the collision plasma heating result; and a fusion combustion process simulation module, connected to the fast electron beam heating collision plasma process simulation module, configured to simulate the fusion combustion process using a radiation fluid program based on the collision plasma heating result, and obtain the neutron yield and fusion energy gain.

[0014] To achieve the above-mentioned objectives and other related objectives, the present invention provides an electronic terminal comprising: one or more memories and one or more processors; the one or more memories are used to store computer programs; and the one or more processors are connected to the memories and are used to run the computer programs to execute the relay-computing-based laser fusion cross-scale simulation method.

[0015] As described above, the present invention is a relay-computing-based laser fusion cross-scale simulation method, system, and terminal, which have the following beneficial effects: The present invention utilizes a radiation fluid program to simulate the nanosecond laser-driven fuel implosion collision process, obtaining the post-collision plasma temperature and density distribution; utilizes a particle kinetics program to simulate the picosecond laser-driven fast electron generation process, obtaining the fast electron beam distribution in phase space; inputs the obtained post-collision plasma temperature and density distribution and the fast electron beam distribution in phase space into a hybrid kinetics program to simulate the fast electron beam heating process of the collision plasma, obtaining the collision plasma heating results; and then utilizes the radiation fluid program to simulate the fusion combustion process based on the collision plasma heating results, obtaining the neutron yield and fusion energy gain. The present invention utilizes numerical simulation methods at different physical scales to calculate the corresponding physical processes, and self-consistently couples the different physical processes for relay calculation, thereby achieving cross-scale simulation of laser fusion schemes and ensuring controllable computational accuracy and computational complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a flow chart of a laser fusion cross-scale simulation method based on relay computing in one embodiment of the present invention.

[0017] Figure 2 Shown is a flow chart of a laser fusion cross-scale simulation method based on relay computing in one embodiment of the present invention.

[0018] Figure 3 Shown is a schematic structural diagram of a laser fusion cross-scale simulation system based on relay computing in one embodiment of the present invention.

[0019] Figure 4 Shown is a schematic structural diagram of an electronic terminal in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0021] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments may be used and that mechanical, structural, electrical and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is limited only by the claims of the published patents. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between one element or feature shown in the figure and another element or feature.

[0022] Throughout this specification, when a part is said to be "connected" to another part, this includes not only "direct connection" but also "indirect connection" with other elements interposed therebetween. Furthermore, when a part is said to "include" a certain component, unless otherwise stated, this does not exclude the other component but rather implies that the other component may be included.

[0023] The terms "first," "second," and "third" are used to describe various parts, components, regions, layers, and / or segments, but are not intended to be limiting. These terms are used solely to distinguish one part, component, region, layer, or segment from another. Therefore, a reference to a first part, component, region, layer, or segment below may also refer to a second part, component, region, layer, or segment without departing from the scope of the present invention.

[0024] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0025] The present invention provides a cross-scale simulation method for laser fusion based on relay calculation. The method uses a radiation fluid program to simulate the nanosecond laser-driven fuel implosion collision process to obtain the plasma temperature and density distribution after the collision. A particle kinetics program is used to simulate the picosecond laser-driven fast electron generation process to obtain the distribution of the fast electron beam in phase space. The obtained plasma temperature and density distribution after the collision and the distribution of the fast electron beam in phase space are input into a hybrid kinetics program to simulate the fast electron beam heating process of the collision plasma and obtain the collision plasma heating results. The radiation fluid program is then used to simulate the fusion combustion process based on the collision plasma heating results to obtain the neutron yield and fusion energy gain. The present invention uses numerical simulation methods at different physical scales to calculate the corresponding physical processes and self-consistently couples the different physical processes for relay calculation, thus achieving cross-scale simulation of laser fusion schemes and ensuring controllable calculation accuracy and computational complexity.

[0026] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0027] like Figure 1 A schematic flow chart showing a laser fusion cross-scale simulation method based on relay computing in an embodiment of the present invention.

[0028] The method comprises:

[0029] Step S1: Use the radiation fluid program to simulate the nanosecond laser-driven fuel implosion collision process and obtain the plasma temperature and density distribution after the collision.

[0030] In one embodiment, a radiation fluid program is used to simulate the nanosecond laser-driven fuel implosion collision process. The two-dimensional radiation fluid program is a computational tool for simulating and analyzing radiation fluid mechanics phenomena in two-dimensional space. The two-dimensional radiation fluid program can handle the coupling of multiple physical processes, such as fluid dynamics, heat conduction, radiation transfer, laser or ion beam deposition, etc. The two-dimensional radiation fluid program has a nanosecond laser and plasma interaction module and a fluid mechanics module. The nanosecond laser and plasma interaction module can simulate the interaction process between nanosecond laser and plasma. The fluid mechanics module is responsible for simulating the dynamic process of the fluid, which includes solving the conservation equations of mass, momentum and energy of the fluid, as well as the interaction between the fluid and the solid structure.

[0031] Step S1 includes:

[0032] like Figure 2, the geometric parameters and power waveform of the ablation layer, fuel, gold cone structure and nanosecond laser are set in the two-dimensional radiation fluid program, and the nanosecond laser-driven fuel implosion collision process is calculated based on these data, the plasma temperature and density distribution after the collision is obtained, and converted into the file format required by the hybrid dynamics program.

[0033] The time scale and spatial scale of the two-dimensional radiation fluid program simulation match the input laser energy, the simulation time scale is not less than 10ns, and the spatial scale is not less than 1000μm.

[0034] In one specific embodiment, the two-dimensional radiation fluid program MULTI-2D was used to simulate nanosecond laser-driven fuel implosion collisions. MULTI is a radiation magnetohydrodynamics package with simulation capabilities covering laser fusion, Z-pinch fusion, and heavy-ion fusion. It includes three versions: the one-dimensional MULTI-IFE, the two-dimensional MULTI-2D, and the three-dimensional MULTI-3D. As a two-dimensional radiation fluid program, MULTI-2D is primarily used for target design and experimental interpretation in inertial confinement fusion.

[0035] In the MULTI-2D program, the geometric parameters and waveforms of the ablation layer, fuel, gold cone structure, and nanosecond laser can be configured, and the process of nanosecond laser ablation of the compressed fuel can be calculated. Driven by the ablation pressure, the fuel is compressed and accelerated within the cone, ultimately ejected from the cone mouth and collided. MULTI-2D generates the temperature and density distribution of the colliding plasma and, through post-processing, converts it into the file format required by the hybrid dynamics program described later. The MULTI-2D simulation scale is approximately 1000 μm × 1000 μm, and the time scale is approximately 10 ns.

[0036] In one embodiment, a two-dimensional radiation fluid program FLASH is used to simulate the nanosecond laser driven fuel implosion collision process.

[0037] Step S2: Using a particle kinetics program, simulate the fast electron generation process driven by the picosecond laser and obtain the distribution of the fast electron beam in the phase space.

[0038] In one embodiment, a particle kinetics program is used to simulate the fast electron generation process driven by a picosecond laser. The particle kinetics program, namely the PIC (Particle In Cell) program, is a computational program used to simulate and study the motion and interaction of particles in a plasma. The basic idea of ​​the PIC program is to divide the plasma into many small units, called "grids" (Cell). Each grid contains equations describing the particle dynamics, and the electric and magnetic fields are calculated based on the charge density and current density of each grid. The interaction between particles in the grid and the interaction with the electric and magnetic fields jointly determine the behavior of the plasma.

[0039] Step S2 includes: Figure 2 The PIC program calculates the picosecond laser-driven fast electron generation process based on the energy, focal spot, and pulse width provided by the laser device. The distribution of the fast electron beam in phase space is obtained and converted into the file format required by the hybrid dynamics program. The particle kinetics program simulates time and spatial scales that match the input laser energy, meaning the simulated time scale is comparable to the picosecond laser pulse length and the spatial scale is no less than 100 μm.

[0040] In one specific embodiment, the KLAPS particle simulation program (PIC) was used to calculate the picosecond laser-driven fast electron generation process and obtain the distribution of the fast electron beam in phase space. The KLAPS particle simulation program was developed by a research team from the Institute of Physics, Chinese Academy of Sciences, and Renmin University of China. This program is primarily used to simulate physical processes such as laser-plasma interaction, electron beam propagation, and electron beam heating of the target center.

[0041] The KLAPS particle simulation program simulates the interaction between the ps laser and the plasma to generate fast electrons by inputting parameters such as the laser's energy, focal spot, and pulse width. The KLAPS simulation scale is approximately 200 μm × 200 μm × 150 μm, with a time scale of approximately 10 ps and a peak plasma density of approximately 0.5 g / cc.

[0042] It should be noted that in addition to using the PIC program KLAPS particle simulation program, the existing PIC program can be used to calculate the fast electron generation process driven by the picosecond laser based on the energy, focal spot and pulse width provided by the laser device to obtain the distribution of the fast electron beam in the phase space.

[0043] Step S3: using a hybrid kinetics program to simulate the fast electron beam heating of the collision plasma according to the plasma temperature and density distribution after the collision and the distribution of the fast electron beam in the phase space, and obtain the collision plasma heating result.

[0044] In one embodiment, a hybrid kinetics program is used to simulate the process of fast electron beam heating colliding plasma, and the colliding plasma heating results are obtained. The hybrid kinetics program, namely the three-dimensional Hybrid-PIC (Particle In Cell) program, is a highly complex simulation tool for studying and analyzing the interaction between particles and fields in three-dimensional space. The three-dimensional Hybrid-PIC program combines particle kinetics, electromagnetic fields and fluid mechanics to study the behavior of plasma by simulating the movement of particles and their interaction with electromagnetic fields. In some Hybrid-PIC models, the electrons and ions of the colliding plasma are regarded as fluids, and only the fast electrons generated by the picosecond laser are regarded as particles. This method retains the key features of particle kinetics and reduces the computational complexity. The hybrid kinetics program can calculate the evolution of fast charged particle beams and high-density colliding plasmas using particle methods and fluid methods respectively.

[0045] The step S3 includes: Figure 2 The temperature and density distribution of the plasma after the collision, calculated and converted by the two-dimensional radiation fluid program, and the distribution of the fast electron beam in the phase space, calculated and converted by the particle kinetics program, are input into the hybrid dynamics program (three-dimensional Hybrid-PIC program). The fast electron beam heating process of the collision plasma is calculated, the collision plasma heating results are obtained, and the results are converted into the file format required by the three-dimensional radiation fluid program. The collision plasma heating results include: the temperature and density distribution after the collision plasma is heated.

[0046] The time scale and spatial scale of the hybrid dynamics program match the input laser energy, and the simulation time scale is not less than 20 ps, ​​and the spatial scale is not less than 100 μm.

[0047] In one embodiment, the colliding plasma heating results also include the magnetic field distribution after the colliding plasma heating. The plasma temperature and density distribution after the collision, calculated and converted by the two-dimensional radiation fluid program, and the fast electron beam phase space distribution, calculated and converted by the particle kinetics program, are input into a hybrid dynamics program (a three-dimensional Hybrid-PIC program). This program calculates the fast electron beam heating process of the colliding plasma, obtains the temperature, density, and magnetic field distributions after the colliding plasma heating, and converts the results into the file format required by the three-dimensional radiation fluid program.

[0048] In one embodiment, the hybrid kinetics program, HEETS, a three-dimensional hybrid kinetics simulation program, is used to calculate the heating of a fast electron beam into an colliding plasma, obtaining the heating results. HEETS is a numerical simulation tool designed for high-energy-density physics problems, particularly relativistic laser-plasma interactions and the transport behavior of the resulting charged particle beam in high-density plasmas.

[0049] The temperature density of the colliding plasma calculated by MULTI-2D and the phase space distribution of the fast electron beam calculated by KLAPS are input into the HEETS calculation of the heating process. This allows the distribution of hot spots generated by the picosecond laser in the high-density colliding plasma to be obtained, and the temperature, density, and magnetic field distribution of the colliding plasma after heating can be calculated. The spatial scale of the KLAPS simulation is approximately 200 μm × 200 μm × 150 μm, the time scale is approximately 10 ps, ​​and the maximum plasma density is approximately 0.5 g / cm 3 The spatial scale of the HEETS simulation is about 100μm×100μm×160μm, the time scale is about 20ps, and the maximum plasma density is about 400g / cm 3 .

[0050] Step S4: Utilizing a radiation fluid program to simulate the fusion combustion process based on the colliding plasma heating results, and obtaining the neutron yield and fusion energy gain.

[0051] In one embodiment, a 3D radiation-fluid program is used to simulate the fusion combustion process based on the heating results of the colliding plasma. 3D radiation-fluid programs are computational software specifically designed to simulate the interaction between radiation and fluids in three-dimensional space. They can handle multiple physical processes, including radiation transfer, fluid dynamics, thermodynamics, and possibly magnetohydrodynamics, and consider the interactions between these processes.

[0052] Step S4 includes:

[0053] like Figure 2 Using a three-dimensional radiation fluid program, the fusion combustion process is calculated based on the colliding plasma heating results calculated and converted from a hybrid kinetics program, obtaining the neutron yield and fusion energy gain. The simulation time and spatial scales of the three-dimensional radiation fluid program match the input laser energy, and can simulate time scales of no less than 20 ps and spatial scales of no less than 100 μm.

[0054] In one embodiment, the fusion combustion process is simulated using the three-dimensional radiation fluid program O-SUKI-N 3D based on the colliding plasma heating results. The O-SUKI-N 3D program can be used to study the implosion, ignition, and combustion processes of fuel pellets in inertial confinement fusion.

[0055] The temperature, density, and magnetic field distributions of the heated colliding plasma calculated by HEETS were converted into the input format of O-SUKI-N 3D to complete the subsequent combustion process simulation. The O-SUKI-N 3D simulation has a spatial scale of approximately 200μm × 200μm × 200μm and a time scale of approximately 100ps, and it also takes into account the deposition of nuclear fusion reaction products.

[0056] It should be noted that in addition to the 3D radiation fluid program O-SUKI-N 3D, existing 3D radiation fluid programs, such as 3D MULTI-3D, can also be used to calculate the fusion combustion process based on the colliding plasma heating results calculated and converted from a hybrid kinetics program, to obtain the neutron yield and fusion energy gain.

[0057] Similar in principle to the above-mentioned embodiment, the present invention provides a laser fusion cross-scale simulation system based on relay computing.

[0058] The following provides specific embodiments in conjunction with the accompanying drawings:

[0059] like Figure 3 A schematic structural diagram of a laser fusion cross-scale simulation system based on relay computing in an embodiment of the present invention is shown.

[0060] The system comprises:

[0061] Nanosecond laser driven fuel implosion collision process simulation module 1 is used to simulate the nanosecond laser driven fuel implosion collision process using the radiation fluid program and obtain the plasma temperature and density distribution after the collision;

[0062] Picosecond laser-driven fast electron generation process simulation module 2 is used to simulate the fast electron generation process driven by picosecond laser using particle kinetics program and obtain the distribution of fast electron beam in phase space;

[0063] a fast electron beam heating collision plasma process simulation module 3, connected to the nanosecond laser driven fuel implosion collision process simulation module 1 and the picosecond laser driven fast electron generation process simulation module 2, for simulating the fast electron beam heating collision plasma process using a hybrid kinetics program based on the plasma temperature and density distribution after the collision, as well as the distribution of the fast electron beam in the phase space, and obtaining collision plasma heating results;

[0064] The fusion combustion process simulation module 4 is connected to the fast electron beam heating collision plasma process simulation module 3, and is used to use a radiation fluid program to simulate the fusion combustion process according to the collision plasma heating result to obtain the neutron yield and fusion energy gain.

[0065] It should be understood that Figure 3 The division of modules in the system embodiment is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a single physical entity, or physically separated. Furthermore, these units may be implemented entirely in software called by processing elements, entirely in hardware, or partially in software called by processing elements and partially in hardware.

[0066] Since the implementation principle of the laser fusion cross-scale simulation system based on relay calculation has been described in the above embodiments, it will not be repeated here.

[0067] The laser fusion cross-scale simulation method based on relay computing provided by the embodiment of the present invention can be implemented on the terminal side or the server side. As for the hardware structure of the electronic terminal, please refer to Figure 4 , is an optional hardware structure diagram of an electronic terminal 1000 provided in an embodiment of the present invention. The terminal 1000 can be a mobile phone, a computer device, a tablet device, etc. The terminal 1000 includes: at least one processor 1001, a memory 1002, at least one network interface 10010 and a user interface 1009. The various components in the device are coupled together through a bus system 1005. It can be understood that the bus system 1005 is used to achieve connection and communication between these components. In addition to the data bus, the bus system 1005 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, Figure 4 Various buses are labeled as bus systems.

[0068] The user interface 1009 may include a display, a keyboard, a mouse, keys, buttons, a touch panel or a touch screen.

[0069] It will be appreciated that the memory 1002 may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM) or a programmable read-only memory (PROM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM) and synchronous static random access memory (SSRAM). The memory described in the embodiments of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

[0070] The memory 1002 in the embodiment of the present invention is used to store various categories of data to support the operation of the terminal 1000. Examples of these data include: any executable program for operating on the terminal 1000, such as an operating system 10021 and an application 10022; the operating system 10021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application 10022 can include various applications, such as a media player (MediaPlayer), a browser (Browser), etc., for implementing various application services. The laser fusion cross-scale simulation method based on relay computing provided in the embodiment of the present invention can be included in the application 10022.

[0071] The methods disclosed in the above embodiments of the present invention can be applied to or implemented by processor 1001. Processor 1001 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in processor 1001 or by software instructions. The above processor 1001 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 1001 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor 1001 may be a microprocessor or any conventional processor. The steps of the accessory optimization method provided in the embodiments of the present invention can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium located in a memory. The processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the above method.

[0072] In an exemplary embodiment, the terminal 1000 may be used by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), and complex programmable logic devices (CPLDs) to execute the aforementioned method.

[0073] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with a computer program. The aforementioned computer program can be stored in a computer-readable storage medium. When executed, the program performs the steps in the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0074] In the embodiments provided herein, the computer readable and writable storage medium may include a read-only memory, a random access memory, an EEPROM, a CD-ROM or other optical disk storage device, a magnetic disk storage device or other magnetic storage device, a flash memory, a USB flash drive, a mobile hard disk, or any other medium that can be used to store desired program code in the form of instructions or data structures and can be accessed by a computer. In addition, any connection can be appropriately referred to as a computer readable medium. For example, if the instruction is sent from a website, a server or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of the medium. However, it should be understood that computer readable and writable storage media and data storage media do not include connections, carriers, signals or other temporary media, but are intended to be non-temporary, tangible storage media. Disk and disc, as used in this application, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.

[0075] In summary, the present invention's relay-computing-based laser fusion cross-scale simulation method, system, and terminal utilize a radiation fluid program to simulate the nanosecond laser-driven fuel implosion collision process, obtaining the plasma temperature and density distribution after the collision; utilize a particle kinetics program to simulate the picosecond laser-driven fast electron generation process, obtaining the distribution of the fast electron beam in phase space; input the obtained plasma temperature and density distribution after the collision and the distribution of the fast electron beam in phase space into a hybrid kinetics program to simulate the fast electron beam heating collision plasma process and obtain the collision plasma heating results; then utilize the radiation fluid program to simulate the fusion combustion process based on the collision plasma heating results to obtain the neutron yield and fusion energy gain. The present invention uses numerical simulation methods at different physical scales to calculate the corresponding physical processes, and self-consistently couples the different physical processes to perform relay calculations, thereby achieving cross-scale simulation of laser fusion schemes and ensuring controllable calculation accuracy and computational complexity. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, any equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A laser fusion cross-scale simulation method based on relay computing, characterized in that: The method comprises: Use the radiative fluid program to simulate the nanosecond laser-driven fuel implosion collision process and obtain the plasma temperature and density distribution after the collision; Use particle kinetics programs to simulate the fast electron generation process driven by picosecond lasers and obtain the distribution of the fast electron beam in phase space; Using a hybrid kinetics program, we simulate the process of fast electron beam heating the colliding plasma based on the temperature and density distribution of the plasma after the collision, as well as the distribution of the fast electron beam in the phase space, and obtain the heating results of the colliding plasma. The fusion combustion process is simulated based on the colliding plasma heating results using a radiation fluid program to obtain the neutron yield and fusion energy gain.

2. The laser fusion cross-scale simulation method based on relay computing according to claim 1, characterized in that: The method of simulating the nanosecond laser-driven fuel implosion collision process using a radiation fluid program and obtaining the plasma temperature and density distribution after the collision includes: A two-dimensional radiation fluid program is used to calculate the nanosecond laser-driven fuel implosion collision process based on the set ablation layer, fuel, gold cone structure, as well as the geometric parameters and power waveform of the nanosecond laser. The plasma temperature and density distribution after the collision are obtained and converted into the file format required by the hybrid dynamics program.

3. The laser fusion cross-scale simulation method based on relay computing according to claim 1, characterized in that: The method of simulating the fast electron generation process driven by a picosecond laser using a particle kinetics program and obtaining the distribution of the fast electron beam in phase space includes: The particle kinetics program is used to calculate the fast electron generation process driven by the picosecond laser according to the energy, focal spot and pulse width provided by the laser device, obtain the distribution of the fast electron beam in the phase space, and convert it into the file format required by the hybrid dynamics program.

4. The laser fusion cross-scale simulation method based on relay computing according to claim 1, characterized in that: The hybrid kinetics program is used to simulate the fast electron beam heating collision plasma process based on the plasma temperature and density distribution after the collision and the distribution of the fast electron beam in the phase space, and the collision plasma heating results are obtained, including: The temperature and density distribution of the plasma after the collision, calculated and converted by the two-dimensional radiation fluid program, and the distribution of the fast electron beam in the phase space, calculated and converted by the particle kinetics program, are input into the hybrid dynamics program to calculate the fast electron beam heating process of the collision plasma, obtain the collision plasma heating results, and convert them into the file format required by the three-dimensional radiation fluid program; the collision plasma heating results include: the temperature and density distribution after the collision plasma is heated.

5. The laser fusion cross-scale simulation method based on relay computing according to claim 1, characterized in that: The method of simulating the fusion combustion process using the radiation fluid program according to the collision plasma heating results to obtain the neutron yield and fusion energy gain includes: The fusion combustion process is calculated using a three-dimensional radiation fluid program based on the input colliding plasma heating results calculated and converted by a hybrid kinetic program to obtain the neutron yield and fusion energy gain.

6. The laser fusion cross-scale simulation method based on relay computing according to claim 3, characterized in that: The KLAPS particle simulation program was used to calculate the fast electron generation process driven by picosecond laser and obtain the distribution of the fast electron beam in phase space.

7. The laser fusion cross-scale simulation method based on relay computing according to claim 4, characterized in that: The three-dimensional hybrid kinetic simulation program HEETS is used to calculate the fast electron beam heating process of the colliding plasma and obtain the colliding plasma heating results.

8. The laser fusion cross-scale simulation method based on relay computing according to claim 4, characterized in that: The collision plasma heating results also include: the magnetic field distribution after the collision plasma heating, which is format-converted together with the calculated temperature and density distribution after the collision plasma heating and then input into a three-dimensional radiation fluid program to calculate the fusion combustion process.

9. A laser fusion cross-scale simulation system based on relay computing, characterized in that: The system comprises: Nanosecond laser-driven fuel implosion collision process simulation module, which is used to simulate the nanosecond laser-driven fuel implosion collision process using the radiation fluid program and obtain the plasma temperature and density distribution after the collision; Picosecond laser-driven fast electron generation process simulation module, used to simulate the fast electron generation process driven by picosecond laser using particle kinetics program and obtain the distribution of fast electron beam in phase space; a fast electron beam heating collision plasma process simulation module, connected to the nanosecond laser-driven fuel implosion collision process simulation module and the picosecond laser-driven fast electron generation process simulation module, for simulating the fast electron beam heating collision plasma process using a hybrid kinetics program based on the plasma temperature and density distribution after the collision and the distribution of the fast electron beam in the phase space, and obtaining collision plasma heating results; The fusion combustion process simulation module is connected to the fast electron beam heating collision plasma process simulation module and is used to use a radiation fluid program to simulate the fusion combustion process according to the collision plasma heating result to obtain the neutron yield and fusion energy gain.

10. An electronic terminal, characterized in that: include: one or more memories and one or more processors; The one or more memories are used to store computer programs; The one or more processors are connected to the memory and are configured to run the computer program to perform the method according to any one of claims 1 to 8.

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