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

Abstract

The invention provides a laser fusion cross-scale simulation method and system based on relay calculation and a terminal, and the method comprises the steps: carrying out the simulation of a nanosecond laser-driven fuel implosion collision process through a radiation fluid program, and obtaining the temperature and density distribution of plasma after collision; performing picosecond laser driven fast electron generation process simulation by using a particle kinematics program to obtain distribution of fast electron beams in a phase space; inputting the obtained temperature and density distribution of the collided plasmas and the distribution of the fast electron beams in the phase space into a hybrid pharmacology program to simulate the fast electron beam heating process of the collided plasmas, and obtaining a collided plasma heating result; and carrying out fusion combustion process simulation according to a collision plasma heating result by utilizing a radiation fluid program to obtain a neutron yield and a fusion energy gain. According to the method, numerical simulation methods of different physical scales are used for calculating the corresponding physical processes, the different physical processes are mutually coupled for relay calculation, cross-scale simulation of the laser fusion scheme is achieved, and it is guaranteed that the calculation precision and the calculation amount are controllable.

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 calculation. Background Art

[0002] With the birth 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 of the United States achieved the net gain goal of fusion output energy greater than laser input energy for the first time. However, the indirect drive central ignition scheme adopted by the National Ignition Facility of the United States has physical difficulties such as low energy utilization and high fluid instability, making it difficult to achieve a high enough fusion gain for clean energy.

[0003] In order to solve these two major physical difficulties, Chinese scientist Academician Zhang Jie proposed a double-cone collision ignition scheme in 2018 based on the latest scientific and technological achievements. This scheme combines the advantages of high-energy nanosecond laser compression of fuel and ultra-high-intensity picosecond laser generation of fast electrons to heat fuel, effectively suppressing fluid instability during compression and improving energy coupling efficiency and fusion gain potential. However, the double-cone collision ignition scheme involves a wide range of physical processes, from the interaction between relativistic lasers and plasma at the femtosecond micrometer scale dominated by electromagnetic fields and particle collisions, to the implosion collision process at the nanosecond millimeter scale dominated by fluid effects. It is extremely difficult to numerically simulate the entire process. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned 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 purpose and other related purposes, the present invention provides a laser fusion cross-scale simulation method based on relay calculation, 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 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 obtaining the collision plasma heating result; using a radiation fluid program to simulate a fusion combustion process based on the collision plasma heating result, 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 the plasma temperature and density distribution after the collision includes: using a two-dimensional radiation fluid program to calculate the nanosecond laser-driven fuel implosion collision process according to the set ablation layer, fuel, gold cone structure, and the geometric parameters and power waveform of the nanosecond laser, obtain the plasma temperature and density distribution after the collision, and convert them into the 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 a particle kinetics program to calculate the fast electron generation process driven by a 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 using a hybrid kinetics program to simulate the process of fast electron beam heating the colliding plasma based on the temperature and density distribution of the plasma after the collision and the distribution of the fast electron beam in the phase space, and obtaining the colliding plasma heating result includes: inputting the temperature and density distribution of the plasma after the collision calculated and converted by a two-dimensional radiation fluid program and the distribution of the fast electron beam in the phase space calculated and converted by a particle kinetics program into the hybrid kinetics program, calculating the process of fast electron beam heating the colliding plasma, obtaining the colliding plasma heating result, and converting it into the file format required by the three-dimensional radiation fluid program; the colliding plasma heating result includes: 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 input by a hybrid kinetic program and converted into a format 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 the 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 collision plasma is heated is format-converted together with the calculated temperature and density distribution after the collision plasma is heated 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 purpose and other related purposes, the present invention provides a laser fusion cross-scale simulation system based on relay calculation, the system comprising: a nanosecond laser driven fuel implosion collision process simulation module, used to simulate the nanosecond laser driven fuel implosion collision process by using a radiation fluid program, and obtain the plasma temperature and density distribution after the collision; a picosecond laser driven fast electron generation process simulation module, used to simulate the picosecond laser driven fast electron generation process by using a particle kinetics program, and obtain the distribution of the fast electron beam in the 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, used to simulate the fast electron beam heating collision plasma process by using a hybrid kinetics program 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; a fusion combustion process simulation module, connected to the fast electron beam heating collision plasma process simulation module, used to simulate the fusion combustion process by using a radiation fluid program according to the collision plasma heating result, and obtain the neutron yield and fusion energy gain.

[0014] To achieve the above-mentioned purpose and other related purposes, 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; the one or more processors are connected to the memories and are used to run the computer program to execute the laser fusion cross-scale simulation method based on relay calculation.

[0015] As described above, the present invention is a laser fusion cross-scale simulation method, system and terminal based on relay calculation, which has the following beneficial effects: the present invention uses a radiation fluid program to simulate the fuel implosion collision process driven by nanosecond lasers to obtain the plasma temperature and density distribution after the collision; uses a particle kinetics program to simulate the fast electron generation process driven by picosecond lasers to obtain the distribution of the fast electron beam in the phase space; inputs the obtained plasma temperature and density distribution after the collision and the distribution of the fast electron beam in the phase space into a hybrid kinetics program to simulate the fast electron beam heating collision plasma process and obtain the collision plasma heating result; then uses the 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. The present invention uses numerical simulation methods of different physical scales to calculate the corresponding physical processes, and self-consistently couples different physical processes to perform relay calculations, thereby realizing the cross-scale simulation of the laser fusion scheme and ensuring that the accuracy and amount of calculation are controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic 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 schematic 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 by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 without 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 also be used, and that mechanical composition, 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 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 an element or feature shown in the figure and another element or feature.

[0022] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a part is said to "include" a certain constituent element, unless otherwise stated, it does not exclude other constituent elements, but means that other constituent elements may be included.

[0023] The terms first, second and third mentioned herein are used to describe various parts, components, regions, layers and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer or segment from other parts, components, regions, layers or segments. Therefore, the first part, component, region, layer or segment described below may refer to the second part, component, region, layer or segment within 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 there is an indication to the contrary in the context. 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. Therefore, "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 will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0025] The present invention provides a laser fusion cross-scale simulation method based on relay calculation, which uses a radiation fluid program to simulate the fuel implosion collision process driven by a nanosecond laser to obtain the plasma temperature and density distribution after the collision; uses a particle kinetics program to simulate the fast electron generation process driven by a picosecond laser to obtain the distribution of the fast electron beam in the phase space; inputs the obtained plasma temperature and density distribution after the collision and the distribution of the fast electron beam in the phase space into a hybrid kinetics program to simulate the fast electron beam heating collision plasma process, and obtains the collision plasma heating result; and then uses the 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. The present invention uses numerical simulation methods of different physical scales to calculate the corresponding physical processes, and self-consistently couples different physical processes to perform relay calculations, thereby realizing the cross-scale simulation of the laser fusion scheme and ensuring that the accuracy and amount of calculation are controllable.

[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 the solution of the mass, momentum and energy conservation equations 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 space scale of the two-dimensional radiation fluid program simulation match the input laser energy, the time scale of the simulation is not less than 10ns, and the space scale is not less than 1000μm.

[0034] In a specific embodiment, the two-dimensional radiation fluid program MULTI-2D is used to simulate the nanosecond laser-driven fuel implosion collision process. The MULTI program is a radiation magnetohydrodynamics program package with simulation capabilities covering laser fusion, Z-pinch fusion and heavy ion fusion, including three versions: one-dimensional MULTI-IFE, two-dimensional MULTI-2D and three-dimensional MULTI-3D. As a two-dimensional radiation fluid program, MULTI-2D is mainly used for target design and related experimental interpretation of 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 set, and the process of nanosecond laser ablation of compressed fuel can be calculated. Driven by the ablation pressure, the fuel is compressed and accelerated inside the gold cone, and finally ejected from the cone mouth to collide. MULTI-2D will give the temperature and density distribution of the colliding plasma, and convert it into the file format required by the subsequent hybrid dynamics program through post-processing. The spatial scale of the MULTI-2D simulation is about 1000μm×1000μm, and the time scale is about 10ns.

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

[0037] Step S2: Use a particle kinetics program to 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 movement 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 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 , using the PIC program to calculate the picosecond laser-driven fast electron generation process 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. The time scale and spatial scale simulated by the particle dynamics program match the input laser energy, that is, the time scale that can be simulated is equivalent to the length of the ps laser pulse, and the spatial scale is not less than 100μm.

[0040] In a specific embodiment, the PIC program KLAPS particle simulation program is used to calculate the fast electron generation process driven by the picosecond laser to obtain the distribution of the fast electron beam in the 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. The program is mainly used to simulate physical processes such as the interaction between laser and plasma, electron beam transmission, and heating of the target center area by the electron beam.

[0041] The energy, focus and pulse width parameters provided by the laser device are input into the KLAPS particle simulation program to simulate the process of the interaction between ps laser and plasma to produce fast electrons. The spatial scale of the KLAPS simulation is about 200μm×200μm×150μm, the time scale is about 10ps, and the maximum plasma density is about 0.5g / 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 according to 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 collision plasma process 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 result is obtained. The hybrid kinetics program, i.e., 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 picosecond lasers 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 comprises: 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 result is obtained, and it is converted into the file format required by the three-dimensional radiation fluid program; the collision plasma heating result includes: 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, the simulation time scale is not less than 20ps, and the spatial scale is not less than 100μm.

[0047] In one embodiment, the collision plasma heating result also includes: the magnetic field distribution after the collision plasma heating. The plasma temperature and density distribution 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 collision plasma process is calculated, the temperature, density and magnetic field distribution after the collision plasma heating are obtained, and converted into the file format required by the three-dimensional radiation fluid program.

[0048] In a specific embodiment, a hybrid kinetics program, a three-dimensional hybrid kinetics simulation program HEETS, is used to calculate the fast electron beam heating colliding plasma process to obtain the colliding plasma heating result. The three-dimensional hybrid kinetics simulation program HEETS is a numerical simulation tool designed for high energy density physics problems, especially relativistic laser plasma interactions and the transport behavior of the generated charged particle beam in high-density plasma.

[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 heating process to obtain the distribution of hot spots generated by the picosecond laser in the high-density colliding plasma, and the temperature, density and magnetic field distribution of the colliding plasma after heating are calculated. The spatial scale of the KLAPS simulation is about 200μm×200μm×150μm, the time scale is about 10ps, and the maximum plasma density is about 0.5g / 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: simulating the fusion combustion process according to the colliding plasma heating results using a radiation fluid program to obtain the neutron yield and fusion energy gain.

[0051] In one embodiment, a fusion combustion process is simulated based on the colliding plasma heating results using a three-dimensional radiation fluid program. Three-dimensional radiation fluid programs are computational software specifically designed to simulate the interaction between radiation and fluid in three-dimensional space. They can handle multiple physical processes such as radiation transmission, 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 input collision plasma heating results calculated and converted by the hybrid kinetics program to obtain the neutron yield and fusion energy gain. The time scale and spatial scale simulated by the three-dimensional radiation fluid program match the input laser energy, and the time scale that can be simulated is not less than 20ps, and the spatial scale is not less than 100μm.

[0054] In a specific embodiment, a three-dimensional radiation fluid program O-SUKI-N 3D is used to simulate the fusion combustion process 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 distribution of the colliding plasma after heating calculated by HEETS are converted into the input format of O-SUKI-N 3D to complete the simulation of the subsequent combustion process. The spatial scale of O-SUKI-N 3D simulation is about 200μm×200μm×200μm, the time scale is about 100ps, and the product deposition of nuclear fusion reaction is taken into account.

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

[0057] Similar to the principle of 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, used to simulate the nanosecond laser driven fuel implosion collision process using a 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] The fast electron beam heating collision plasma process simulation module 3 is 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, and is used to use a hybrid kinetics program to simulate the fast electron beam heating collision plasma process 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;

[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 simulate the fusion combustion process according to the collision plasma heating result by using the radiation fluid program to obtain the neutron yield and fusion energy gain.

[0065] It should be understood that Figure 3 The division of each module in the system embodiment is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. And these units can all be implemented in the form of software calling through processing elements; they can also be all implemented in the form of hardware; some units can also be implemented in the form of processing elements calling software, and some units can be implemented in the form of hardware.

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

[0067] The laser fusion cross-scale simulation method based on relay computing provided in 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 may 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 In the specification, 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 is understood that the memory 1002 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), which is used as an external cache. By way of exemplary but not limiting explanation, many forms of RAM are available, such as static random access memory (SRAM), 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 categories 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 may 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 may be included in the application 10022.

[0071] The method disclosed in the above embodiment of the present invention can be applied to the processor 1001, or implemented by the processor 1001. The processor 1001 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 1001 or the instruction in the form of software. The above processor 1001 may be a general processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 1001 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiment of the present invention. The general processor 1001 can be a microprocessor or any conventional processor, etc. In combination with the steps of the accessory optimization method provided in the embodiment of the present invention, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0072] In an exemplary embodiment, the terminal 1000 may be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD) to execute the aforementioned method.

[0073] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to the computer program. The aforementioned computer program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

[0074] In the embodiments provided in the present application, 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 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 a desired program code in the form of an instruction or data structure 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, an optical fiber cable, a twisted pair, a digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, the coaxial cable, optical fiber 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 laser fusion cross-scale simulation method, system and terminal based on relay calculation of the present invention, by using the radiation fluid program to simulate the nanosecond laser driven fuel implosion collision process, obtain the plasma temperature and density distribution after the collision; use the particle kinetics program to simulate the fast electron generation process driven by the picosecond laser, and obtain the distribution of the fast electron beam in the phase space; the obtained plasma temperature and density distribution after the collision and the distribution of the fast electron beam in the phase space are input into the hybrid kinetics program to simulate the fast electron beam heating collision plasma process, and obtain the collision plasma heating result; then use the radiation fluid program to simulate the fusion combustion process according to the collision plasma heating result, and obtain the neutron yield and fusion energy gain. The present invention uses numerical simulation methods of different physical scales to calculate the corresponding physical processes, and self-consistently couples different physical processes to perform relay calculations, thereby realizing the cross-scale simulation of the laser fusion scheme and ensuring that the calculation accuracy and calculation amount are controllable. Therefore, the present invention effectively overcomes the various shortcomings in the prior art and has a high industrial utilization 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 familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still 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: The radiation fluid program is used to simulate the nanosecond laser-driven fuel implosion collision process and obtain the plasma temperature and density distribution after the collision; The particle kinetics program is used to simulate the fast electron generation process driven by picosecond lasers and obtain the distribution of the fast electron beam in phase space; The hybrid kinetics program is used to simulate the fast electron beam heating collision plasma process according to the plasma temperature and density distribution after the collision, as well as the distribution of the fast electron beam in the phase space, and the collision plasma heating results are obtained; 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 calculation according to claim 1, characterized in that: The method of using the radiation fluid program to simulate the nanosecond laser driven fuel implosion collision process 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 according to the set ablation layer, fuel, gold cone structure, and the geometric parameters and power waveform of the nanosecond laser, and 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 calculation 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 the 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 process of fast electron beam heating the collision plasma according to the temperature and density distribution of the plasma 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, which are calculated and converted by the two-dimensional radiation fluid program, and the distribution of the fast electron beam in the phase space, which are 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 calculation according to claim 1, characterized in that: The method of using the 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 includes: The fusion combustion process is calculated using a three-dimensional radiation fluid program based on the input collision 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 calculation according to claim 3, characterized in that: The KLAPS particle simulation program is used to calculate the fast electron generation process driven by picosecond laser and obtain the distribution of the fast electron beam in the 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 colliding plasma process 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 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 then input into the 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, used to simulate the nanosecond laser driven fuel implosion collision process using radiation fluid program and obtain the plasma temperature and density distribution after the collision; The module for simulating the fast electron generation process driven by picosecond laser 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; A fast electron beam heating collision plasma process simulation module is connected to the nanosecond laser driven fuel implosion collision process simulation module and the picosecond laser driven fast electron generation process simulation module, and is used to use a hybrid kinetics program to simulate the fast electron beam heating collision plasma process 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; 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, connected to the memory, are configured to run the computer program to perform the method according to any one of claims 1 to 8.

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