Analysis method of interaction dynamics of double-beam counter-propagating laser and ultra-thin target

Abstract

The application relates to a method for analyzing the interaction dynamics of double-beam counter-propagation laser and ultrathin target. The method comprises the following steps: based on the constructed physical model of the interaction between double-beam counter-propagation relativistic laser and ultrathin target, the particle simulation method is used to analyze the compression condition and the maximum deuterium ion density information of the ultrathin target under one-dimensional and two-dimensional conditions by changing the initial relative phase difference and the circularly polarized laser electric field vector rotation direction of the two beams, the ion acceleration effect information generated by the interaction between the counter-propagation laser and the ultrathin target under different parameters is obtained, and the optimal ion acceleration scheme is determined. The interaction between the two-beam counter-propagation relativistic laser and the ultrathin target is realized, the polarization direction and the rotation direction of the two lasers are calibrated, the calibration relationship between the ion acceleration and the laser parameters is displayed, and the method can provide a reference for the dynamic research of the double-beam counter-propagation laser and the ultrathin target.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of double-beam laser shooting technology, in particular to a method for analyzing the interaction dynamics of double-beam shooting laser and ultra-thin target. BACKGROUND

[0002] The interaction of ultra-intense laser and solid target produces high-energy ions, which has been widely applied, for example, in the "fast ignition" scheme, high-energy proton beams can be used to drive the generation of high-temperature and high-density material state; in the medical field, high-energy ions can be used for tumor treatment and production of radioactive medical isotopes. In the past two decades, the interaction of double-beam shooting laser and solid target has attracted widespread attention from scientists, and a series of theoretical researches on this mechanism have also been carried out.

[0003] However, on the basis of existing theoretical research, there is no systematic method to analyze the physical phenomena in the process of double-beam shooting laser in an experimental way. SUMMARY

[0004] Therefore, it is necessary to provide a method for analyzing the interaction dynamics of double-beam shooting laser and ultra-thin target, which can obtain the scaling relationship between ion acceleration and laser parameters.

[0005] A method for analyzing the interaction dynamics of double-beam shooting laser and ultra-thin target, the method comprising:

[0006] Constructing a physical model of the interaction of double-beam shooting relativistic laser and ultra-thin target, and setting simulation parameters of the physical model; the simulation space of the physical model is a simulation box of a cuboid, the ultra-thin target is arranged in the center of the simulation box, and two circularly polarized lasers are vertically incident from the left and right boundaries of the simulation box; the simulation parameters include size information of the simulation box, size information and composition information of the ultra-thin target, and spatial resolution information of the simulation space;

[0007] Taking the initial phase difference of the two lasers as the first variable and the rotation direction of the electric field vector of the circularly polarized laser as the second variable, a plurality of groups of laser setting parameters are constructed;

[0008] Under each group of laser setting parameters, the compression condition and the maximum deuterium ion density information of the ultra-thin target in one-dimensional and two-dimensional conditions are analyzed by the particle simulation method, and further the optimal ion acceleration parameter setting information is obtained.

[0009] In one embodiment, the method further comprises: setting the rotation direction of the electric field vector of the left incident circularly polarized laser as right-handed, the rotation direction of the electric field vector of the right incident circularly polarized laser as left-handed, and the initial phase difference of the two lasers as 0, π / 2, π, 3π / 2, respectively, to obtain four groups of laser setting parameters.

[0010] The rotation direction of the electric field vector of the left incident circularly polarized laser is right-handed, the rotation direction of the electric field vector of the right incident circularly polarized laser is right-handed, and the initial phase difference of the two lasers is 0, π / 2, π, 3π / 2, respectively, to obtain another four groups of laser setting parameters.

[0011] In one of the embodiments, under each group of laser setting parameters, the distribution information of the electric field normalized amplitude along the axial direction under the conditions of right-handed and left-handed circularly polarized laser incidence, double-beam right-handed circularly polarized laser incidence, and different initial phase differences is analyzed by one-dimensional particle simulation method, and the axial distribution information of the electron number density and the deuterium ion number density in the ultra-thin target is obtained.

[0012] Under each group of laser setting parameters, the spatial distribution information of the laser intensity and the spatial distribution information of the electrons and deuterium ions in the ultra-thin target under the conditions of right-handed and left-handed circularly polarized laser incidence, double-beam right-handed circularly polarized laser incidence, and different initial phase differences are analyzed by two-dimensional particle simulation method.

[0013] In one of the embodiments, the maximum value of the deuterium ion density is scanned to obtain the maximum value distribution information of the deuterium ion density under the conditions of different initial phase differences and laser electric field vector rotation direction parameters.

[0014] In one of the embodiments, the electron energy spectrum and the deuterium ion energy spectrum information under the conditions of different initial phase differences and laser electric field vector rotation direction parameters are summarized to obtain the electron energy spectrum diagram and the deuterium ion energy spectrum diagram, respectively.

[0015] The maximum value of the deuterium ion density is scanned to obtain the maximum value distribution information of the deuterium ion density under the conditions of different initial phase differences and laser electric field vector rotation direction parameters.

[0016] In one of the embodiments, the optimal ion acceleration parameter setting information is determined according to the electron energy spectrum diagram, the deuterium ion energy spectrum diagram, and the maximum value distribution information of the deuterium ion density.

[0017] In one of the embodiments, the thickness of the ultra-thin target is 0.1 μm.

[0018] The aforementioned method for analyzing the dynamics of the interaction between a dual-beam through-beam laser and an ultrathin target is based on a constructed physical model of the interaction. Using particle simulation, by changing the initial relative phase difference and the rotation direction of the circularly polarized laser's electric field vector, the compression of the ultrathin target and the maximum deuterium ion density are analyzed in one-dimensional and two-dimensional cases. This yields information on the ion acceleration effect generated by the interaction between the through-beam laser and the ultrathin target under different parameters, thus determining the optimal ion acceleration scheme. This invention, through the interaction of two through-beam relativistic lasers with an ultrathin target, calibrates the polarization and rotation directions of the two lasers, demonstrating the calibration relationship between ion acceleration and laser parameters, and can provide a reference for the dynamics study of dual-beam through-beam lasers and ultrathin targets. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the analysis method for the interaction dynamics between a dual-beam laser and an ultrathin target in one embodiment.

[0020] Figure 2 This is a schematic diagram of a dual-beam opposing laser in one embodiment;

[0021] Figure 3 This is a schematic diagram of two circularly polarized laser beams with different electric field vector rotation directions and initial relative phase differences being emitted from the left and right sides in one embodiment.

[0022] Figure 4 This is the distribution of the maximum deuterium ion density under different phase conditions in a one-dimensional context of one embodiment.

[0023] Figure 5 In one embodiment, under two-dimensional conditions, (RCP+LCP) with different φ 51 Under the condition of t=35T0, the spatial distribution of laser intensity, where (a)-(d) is the laser electric field intensity E y The spatial distribution of (e)-(h) is the spatial distribution of the laser normalized amplitude;

[0024] Figure 6 In one embodiment, under two-dimensional conditions, (RCP+LCP) with different φ 51 Under the condition of t=29T0, the spatial distribution of electrons and ions in the solid target, where (a)-(d) represent the spatial distribution of electron number density and (e)-(h) represent the spatial distribution of deuterium ion number density;

[0025] Figure 7 In one embodiment, under two-dimensional conditions, (RCP+RCP) with different φ 51 Under the condition of t=35T0, the spatial distribution of laser intensity, where (a)-(d) is the laser electric field intensity E y(e)-(h) are the spatial distribution of laser normalized amplitude;

[0026] Figure 8 For one embodiment in two-dimensional conditions, (RCP+RCP) is different φ 51 The spatial distribution of electron and deuterium ion number density at t=29T0 under the condition, wherein (a)-(d) are the spatial distribution of electron density, (e)-(h) are the spatial distribution of deuterium ion number density;

[0027] Figure 9 For one embodiment in two-dimensional conditions, (RCP+RCP) is different φ 51 The energy spectrum analysis at t=50T0 under the condition, wherein (a), (b) are electron energy spectrum, (c), (d) are deuterium ion energy spectrum;

[0028] Figure 10 For one embodiment in two-dimensional conditions, (RCP+RCP) is different φ 51 The distribution of deuterium ion density maximum under the condition. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0030] In one embodiment, as shown in Figure 1 , a method for analyzing the interaction dynamics of double-beam counter-propagation laser and ultra-thin target is provided, comprising the following steps:

[0031] Step 102, constructing a physical model of the interaction of double-beam counter-propagation relativistic laser and ultra-thin target, and setting the simulation parameters of the physical model.

[0032] Specifically, as shown in Figure 2 , two lasers are vertically incident from the left and right boundaries of the simulation region, and the length of the simulation box is set to 36μm and the height is set to 24μm. In the one-dimensional simulation environment, the spatial resolution used in the x direction is 0.0002μm, while in the two-dimensional simulation stage, the spatial resolution in the x direction and the y direction is 0.002μm, and other parameters remain the same.

[0033] The deuterium solid target is located in the center of the simulation box, the front surface of the solid target is 17.95μm away from the left boundary of the simulation space region, the thickness of the ultra-thin target is d=0.1μm, the height is h=24μm, and the height is consistent with that of the simulation box. The solid target is composed of deuterium ions and electrons, and the number density of deuterium ions and electrons is 50n c , wherein n c =1.1×10 27 m-3 is the plasma critical density corresponding to laser wavelength λ0= 1 μm. The grid resolution is 50 deuterium ions and 50 electrons in each grid. For circularly polarized laser, the intensity of both lasers is where the normalized amplitude E0is the maximum electric field amplitude of laser, e and m e are the charge and mass of electron, c is the speed of light in vacuum. The laser focal radius σ L = 6 μm, and the pulse width τ L = 10 T0, where T0= 3.3 fs is the laser period.

[0034] Step 104, taking the initial phase difference of the two lasers as the first variable and the rotation direction of the circularly polarized laser electric field vector as the second variable, constructing multiple sets of laser setting parameters.

[0035] Specifically, the influence of the initial relative phase difference (IRPD, i.e., variable φ 51 ) of the two lasers and the rotation direction of the circularly polarized laser electric field vector on the interaction process is considered, where the rotation direction of the electric field vector includes left-handed (LCP) and right-handed (RCP). Two groups of circularly polarized lasers are classified, as shown in Table 1.

[0036] Left side incident laser light Right side incident laser light 51 ]]> ​ 51 ]]> ​ 51 ]]> ​ 51 ]]> ​ RCP LCP 0 π / 2 π ]]> ​ 3π / 2 RCP RCP 0 π / 2 π ]]> ​ 3π / 2

[0037] Table 1 Circularly polarized laser variable classification

[0038] Figure 3 A schematic diagram of circularly polarized double-beam laser from left to right is given for different electric field vector rotation directions and initial relative phase differences. The two coordinate axes represent the starting position coordinates of the two lasers, i.e., the two boundary interfaces of the simulation box.

[0039] In order to be consistent with the coordinate system rules of the EPOCH program, it is stipulated that the laser propagation direction is the x-axis, the vertically upward direction is the y-axis, and the z-axis is determined by the right-hand screw rule. For the variable initial relative phase difference φ 51 , the initial phase angle of the left incident laser is fixed at 0 degrees, i.e., the electric field vector direction at the initial moment is consistent with the positive direction of the z-axis, and by changing the initial electric vector direction of the right incident laser, the electric vector directions of the two lasers have an angle φ 51 . It should be noted that for the RCP+LCP case, φ 51 remains a fixed value during laser propagation, but for the RCP+RCP case, φ 51 periodically changes during propagation.

[0040] Step 106, under each set of laser setting parameters, the compression of the ultra-thin target and the maximum deuterium ion density information in one-dimensional and two-dimensional conditions are analyzed by the particle simulation method, and further optimal ion acceleration parameter setting information is obtained.

[0041] In the one-dimensional condition, the different φ 51 Under the condition of a certain moment, the normalized amplitude a0 of the electric field along the axial direction, and the different φ 51 Under the condition of a certain moment, the axial distribution of the electron number density and the deuterium ion number density, by changing the initial relative phase difference φ 51 , the manipulation of the ion compression state and the movement of the solid target can be realized.

[0042] Further ion number density analysis, such as Figure 4 The maximum compression density of deuterium ions under different parameter conditions is given. From the figure, it can be seen that the maximum density of deuterium ions under the condition of φ 51 = π is much larger than that under other initial relative phase difference conditions, and the rest of the deuterium ion number density is basically stable at 200n c Around; at the same time, the RCP+RCP condition is not sensitive to the variable φ 51 , and is basically stable at 200n c Around.

[0043] The present application also carries out two-dimensional particle simulation after one-dimensional particle simulation, and observes the physical phenomena of the interaction between two circularly polarized lasers with different rotation directions and the solid target. First, the spatial distribution of the electric field intensity E y and the normalized amplitude a0 are analyzed, and the reflected laser at t = 35T0 is analyzed.

[0044] Analysis of the right and left circularly polarized laser pair (RCP+LCP):

[0045] As shown in Figure 5 , under the condition of different φ 51 , the spatial distribution of laser intensity at t = 35T0, wherein (a)-(d) is the spatial distribution of the laser electric field intensity E y , and (e)-(h) is the spatial distribution of the normalized amplitude of the laser. By Figure 5 It can be found that the two-dimensional simulation phenomenon is basically the same as the one-dimensional simulation, except that different phenomena appear when φ 51 = 0, and other conditions are consistent with the theoretical results: when φ 51 = 0.5π and φ 51The reflected light intensity on the left and right sides of the target is not the same when φ Figure 6 = 1.5π, which is consistent with the one-dimensional simulation. When φ 51 = 0, transverse instability occurs, and the light field differs greatly from the one-dimensional simulation. For the image of φ 51 = π, it can be found that the reflected light on the left side of the target is left-right symmetric, which indicates that transverse instability does not occur significantly during the interaction stage, and the steady-state analytical solution still exists in the two-dimensional process.

[0046] For the compression of the thin target, the time t = 29T0 is selected for analysis. Figure 6 (a)-(d) and 6(e)-(h) are the spatial distributions of the target electron density and deuterium ion density at this time. When φ 51 = 0.5π and φ 51 = 1.5π, the target moves left and right after being affected by the two beams of counter-propagating laser, which is due to the non-zero net optical pressure of the laser on the solid target. The overall effect makes the solid target move. For the case of φ 51 = 0, the target compression effect is the best, which is also the reason for the more intense development of instability. When φ 51 = π, the existence of the steady-state solution causes the optical pressure and the electrostatic pressure of the laser to be balanced, which leads to the less intense development of instability.

[0047] Analysis of the case of counter-propagating circularly polarized laser with right-handed circular polarization (RCP+RCP):

[0048] For two beams of circularly polarized laser with opposite rotating directions of electric vector, the best ion acceleration scheme is predicted by observing the two-dimensional simulation phenomena. Under four different initial relative phase differences, the reflected electric field intensity E y of the laser shows obvious differences, as shown in Figure 7 . Specifically, when φ 51 = 0.5π and φ 51 = 1.5π, the reflected laser on the left and right sides of the solid target shows great difference, which is the result of the combined action of transmission and reflection. For the cases of φ 51 = 0 and φ 51 = π, the electric field intensity on the left and right sides of the solid target is symmetrically distributed. The normalized intensity distribution under different φ 51 is basically symmetric, so further diagnosis of the solid target is needed to obtain the best ion acceleration effect.

[0049] Through the analysis of the electron spatial distribution Figure 8 (a)-(d) and the ion spatial distribution Figure 8(e)-(h) were analyzed, and it was found that the solid target did not move left or right in this case, which was significantly different from the RCP+LCP. The electron density and ion density at this moment were different in size with different φ 51 , and there was a significant difference in the spatial distribution, but by scanning the ion density images at the surrounding moments, it was found that these images only appeared at different moments, that is, the order of appearance was φ 51 = π, φ 51 = 0.5 π (φ 51 = 1.5 π), and φ 51 = 0, that is, φ 51 did not affect the movement of the solid target, nor did it significantly affect the compression effect of the target. At the same time, it can be found that there are many strip-shaped filaments in the range of the laser focal spot radius, which is because the development of transverse instability in this case is more intense than that of RCP+LCP, so it is reasonable that there is no steady-state solution.

[0050] Spectrum analysis:

[0051] The spectrum results of RCP+RCP and RCP+LCP were summarized to obtain the electron spectrum and deuterium ion spectrum, respectively; from Figure 9 (a) and (c), it can be found that the deuterium ion energy is the largest when φ 51 = 0 in both cases. At the same time, the ion cutoff energy is the smallest when φ 51 = π under the condition of RCP+LCP, because the solid target is relatively fixed during compression, which leads to the ion energy being unable to be improved to a very high level. Here, the electron spectrum was also diagnosed, as shown in Figure 9 (b) and (d). It can be found from the figure that the electron cutoff energy is the largest when φ 51 = 0 under the condition of RCP+LCP, and the smallest when φ 51 = π, which is consistent with the distribution of the ion spectrum; and the electron spectrum corresponding to the RCP+LCP condition has no obvious distinction, and the cutoff energy of the electron is not sensitive to the initial relative phase difference.

[0052] It can be concluded that when φ 51 = 0, the cutoff energy of the deuterium ion is the highest, about 34.8 MeV, corresponding to the best ion acceleration effect. Combined with Figure 8 (a)-(h), it can be predicted that this set of physical parameters will be the best scheme for generating neutrons. At the same time, for different left-handed and right-handed states, the movement of the solid target and the acceleration of the ions can be controlled by adjusting the left-handed and right-handed parameters of the two laser beams.

[0053] Optimal ion acceleration scheme:

[0054] By energy spectrum analysis, it is found that the optimal acceleration scheme corresponds to when 51 =0. Further scanning the maximum value of deuterium ion number density, the corresponding value under different parameter conditions is obtained. Figure 10 The maximum density value of deuterium ion in the compression process is given. For the RCP+LCP case, the compression density of deuterium ion when 51 =0 is the maximum, which is consistent with the previous preliminary judgment. While in the RCP+RCP condition, it is found that the relationship between ion number density and 51 is not significant, wherein the density when 51 =0 reaches 151.28n c , which is the largest ion number density among the eight cases.

[0055] Combined with energy spectrum analysis, it can be concluded that for RCP+LCP and 51 =0, the deuterium ion cutoff energy can reach 34.8MeV, the maximum compression density is 147.13n c , and the ion layer compression and ion acceleration effect are the best; while for RCP+RCP and 51 =0, the deuterium ion cutoff energy is 30.1MeV, the maximum compression density is 151.28n c , and there is also the best ion layer compression and ion acceleration.

[0056] In the above analysis method of the interaction dynamics of the double-beam counter-shooting laser and the ultra-thin target, based on the constructed physical model of the interaction of the double-beam counter-shooting relativistic laser and the ultra-thin target, the particle simulation method is used, the compression of the ultra-thin target and the maximum deuterium ion density information in one-dimensional and two-dimensional cases are analyzed by changing the initial relative phase difference and the rotation direction of the circularly polarized laser electric field vector of the two circularly polarized lasers, the ion acceleration effect information generated by the interaction of the counter-shooting laser and the ultra-thin target under different parameters is obtained, and then the optimal ion acceleration scheme is determined. The present application realizes the interaction of the two-beam counter-shooting relativistic laser and the ultra-thin target, labels the polarization direction and rotation direction of the two lasers, displays the labeling relationship between the ion acceleration and the laser parameters, and can provide a reference for the dynamics research of the double-beam counter-shooting laser and the ultra-thin target.

[0057] It should be understood that, although the steps in the flowchart of Figure 1 are shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated otherwise in this document, execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, Figure 1At least one of the steps in the above embodiments can include a plurality of sub-steps or a plurality of stages, which are not necessarily executed at the same time, but can be executed at different times, and the order of execution of the sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with other steps or at least a part of the sub-steps or stages of other steps.

[0058] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it is understood that any combination of the technical features is within the scope of the present disclosure as long as there is no contradiction.

[0059] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A method for analyzing the dynamics of the interaction between a dual-beam through-beam laser and an ultrathin target, characterized in that, The method includes: A physical model of the interaction between a dual-beam relativistic laser and an ultrathin target is constructed, and the simulation parameters of the physical model are set. The simulation space of the physical model is a cuboid simulation box, with an ultrathin target placed in the center of the simulation box. Two circularly polarized lasers are simultaneously incident perpendicularly from the left and right boundaries of the simulation box. The simulation parameters include the size information of the simulation box, the size information and composition information of the ultrathin target, and the spatial resolution information of the simulation space. Using the initial phase difference between the two laser beams as the first variable and the rotation direction of the circularly polarized laser electric field vector as the second variable, multiple sets of laser setting parameters are constructed. Under each set of laser parameters, the compression of the ultrathin target and the maximum deuterium ion density in one-dimensional and two-dimensional cases are analyzed by particle simulation method, and the optimal ion acceleration parameter settings are further obtained.

2. The method according to claim 1, characterized in that, Using the initial phase difference between the two laser beams as the first variable and the rotation direction of the circularly polarized laser electric field vector as the second variable, multiple sets of laser setting parameters are constructed, including: The electric field vector of the incident circularly polarized laser on the left is set to rotate right-handed, and the electric field vector of the incident circularly polarized laser on the right is set to rotate left-handed. The initial phase differences between the two laser beams are 0, π / 2, π, and 3π / 2, respectively, resulting in four sets of laser setting parameters. The electric field vector of the incident circularly polarized laser on the left is set to rotate right-handed, and the electric field vector of the incident circularly polarized laser on the right is set to rotate right-handed. The initial phase differences between the two laser beams are 0, π / 2, π, and 3π / 2, respectively, resulting in four other sets of laser setting parameters.

3. The method according to claim 2, characterized in that, Under each laser parameter setting, the compression of the ultrathin target and the maximum deuterium ion density information in one-dimensional and two-dimensional cases were analyzed using particle simulation, including: Under each laser setting parameter, the axial distribution information of the normalized amplitude of the electric field under different initial phase differences is analyzed by one-dimensional particle simulation method under the conditions of right-handed and left-handed circularly polarized laser incident and dual-beam right-handed circularly polarized laser incident, as well as the axial distribution information of the electron number density and deuterium ion number density in the ultrathin target. Under each laser parameter setting, the spatial distribution information of laser intensity and the spatial distribution information of electrons and deuterium ions in the ultrathin target are analyzed under different initial phase difference conditions by using the two-dimensional particle simulation method, with the exception of right-handed and left-handed circularly polarized laser incident and dual-beam right-handed circularly polarized laser incident.

4. The method according to claim 3, characterized in that, Under each laser parameter setting, the axial distribution information of the normalized amplitude of the electric field under different initial phase differences is analyzed using a one-dimensional particle simulation method for right-handed and left-handed circularly polarized laser incidence and dual-beam right-handed circularly polarized laser incidence. Following the axial distribution information of the electron number density and deuterium ion number density in the ultrathin target, the analysis also includes: The maximum value of deuterium ion density was scanned to obtain the distribution information of the maximum value of deuterium ion density under different initial phase differences and laser electric field vector rotation direction parameters.

5. The method according to claim 4, characterized in that, Under each set of laser parameters, the spatial distribution information of laser intensity and the spatial distribution information of electrons and deuterium ions in the ultrathin target are analyzed using two-dimensional particle simulation methods under different initial phase difference conditions for right-handed and left-handed circularly polarized laser incidence and dual-beam right-handed circularly polarized laser incidence. The analysis also includes: The electronic energy spectrum and deuterium ion energy spectrum information under different initial phase differences and laser electric field vector rotation direction parameters were summarized to obtain the electronic energy spectrum and deuterium ion energy spectrum, respectively. The maximum value of deuterium ion density was scanned to obtain the distribution information of the maximum value of deuterium ion density under different initial phase differences and laser electric field vector rotation direction parameters.

6. The method according to claim 5, characterized in that, Further optimal ion acceleration parameter settings were obtained, including: Based on the electron energy spectrum, the deuterium ion energy spectrum, and the distribution information of the maximum deuterium ion density, the optimal ion acceleration parameter settings are determined.

7. The method according to any one of claims 1 to 6, characterized in that, The thickness of the ultrathin target is 0.1 μm.

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