An in-situ measurement method and device for incident ICF target pellet X-ray radiation flux

Abstract

The present invention discloses an in-situ measurement method and device for the X-ray radiation flow incident on an ICF target capsule, the method comprising the following steps: emitting a laser beam into a preset ICF black cavity, the laser beam irradiating the inner wall of the preset ICF black cavity to form a spot area, and determining the area on the inner wall of the preset ICF black cavity other than the spot area as a non-spot area; measuring the X-ray radiation flow of the spot area and the non-spot area respectively; constructing a black cavity-target capsule model according to the preset ICF black cavity and the ICF target capsule, and obtaining the 4-space X-ray radiation flow distribution incident on the ICF target capsule according to the black cavity-target capsule model, the spot radiation flow and the non-spot radiation flow. The present invention can realize the in-situ measurement of the 4-space X-ray radiation flow distribution incident on the ICF target capsule, and improves the experimental measurement capability of the X-ray radiation flow.

Description

Technical Field

[0001] The present invention relates to the field of X-ray radiation flow detection, and in particular to an in-situ measurement method and device for an incident ICF target pellet X-ray radiation flow. Background Art

[0002] Indirectly driven laser inertial confinement fusion (ICF) converts laser into X-rays by injecting laser into a high-Z material black cavity. The X-rays are then incident on the surface of the nuclear fusion target pellet located in the center of the black cavity, driving the target pellet to achieve implosion compression and thus produce nuclear fusion. This controlled nuclear fusion is expected to solve human energy problems and is of great significance to national defense and military.

[0003] However, to date, the 4π spatial X-ray radiation flux distribution of the incident nuclear fusion target (i.e., the distribution of the X-ray intensity in three-dimensional space that varies with time) has not been directly measured in situ. The measurement methods at home and abroad all use indirect measurement methods, that is, experimentally measuring the X-ray radiation flux ejected from the black cavity wall through the injection port from a certain angle, and comparing it with the numerical simulation results of the radiation flux of the incident target, and taking the closest experimental measurement result as the radiation flux of the incident target.

[0004] The existing methods have the following shortcomings: 1. The X-ray radiation flux measured through the black cavity injection port is affected by the shrinkage effect of the injection port, which reduces the accuracy; 2. The X-ray radiation flux ejected from the black cavity wall through the injection port measured from a certain angle is difficult to accurately equate with the X-ray radiation flux of the incident target pellet; 3. The radiation flux of the incident target pellet obtained by numerical simulation is overestimated by about 15%, which has been confirmed by the so-called energy loss proposed in relevant literature; 4. Only the X-ray radiation flux of the incident target pellet at a certain angle is obtained, and the X-ray radiation flux of the incident target pellet 4 is not obtained. Distribution of spatial X-ray radiation flux. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an in-situ measurement method and device for the X-ray radiation flux incident on an ICF target pellet, which can realize the in-situ measurement of the X-ray radiation flux incident on an ICF target pellet. In-situ measurements of spatial distribution improve the experimental measurement capabilities of X-ray radiation flux.

[0006] An embodiment of the present invention provides an in-situ measurement method of an incident ICF target pellet X-ray radiation flux, comprising the following steps:

[0007] Emitting a laser beam into a preset ICF black cavity, the laser beam irradiating an inner wall of the preset ICF black cavity to form a light spot area, and determining an area on the inner wall of the preset ICF black cavity other than the light spot area as a non-light spot area;

[0008] Measuring the X-ray radiation flow of the spot area and the non-spot area respectively, and obtaining the spot radiation flow and the non-spot radiation flow accordingly;

[0009] A black cavity-target pellet model is constructed according to the preset ICF black cavity and the ICF target pellet, and the 4 incident on the ICF target pellet is obtained according to the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Spatial X-ray radiation flow distribution; wherein the ICF target pellet is located inside the preset ICF black cavity.

[0010] Furthermore, emitting a laser beam into a preset ICF black cavity, wherein the laser beam irradiates an inner wall of the preset ICF black cavity to form a light spot area, specifically includes:

[0011] The surface of the preset ICF black cavity is provided with a plurality of injection ports, and the laser beams respectively enter the interior of the preset ICF black cavity from the plurality of injection ports, forming a plurality of light spot areas on the inner wall of the preset ICF black cavity.

[0012] Furthermore, the respectively measuring the X-ray radiation flows of the light spot area and the non-light spot area specifically includes:

[0013] The X-ray radiation flows in the spot area and the non-spot area are measured respectively by two sets of preset spatially resolved radiation flow detection equipment; wherein the preset spatially resolved radiation flow detection equipment is a device that realizes spatially resolved detection of the X-ray radiation flow emitted by a small radiation source based on the principles of pinhole imaging and limited aperture selection, and the field of view size of the preset spatially resolved radiation flow detection equipment does not exceed the preset field of view threshold.

[0014] Furthermore, the constructing of the black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet specifically includes:

[0015] According to the preset ICF black cavity and the light spot area, a black cavity model having the same structure and size as the preset ICF black cavity is constructed, and a target pellet model having the same structure and size as the ICF target pellet is also arranged at the inner center of the black cavity model, and the black cavity model and the target pellet model constitute the black cavity-target pellet model; wherein the black cavity model also has Lambertian emission properties;

[0016] According to the size and position of the light spot area, a simulated light spot area and a simulated non-light spot area are set on the inner wall of the black cavity model, and the light spot radiation flow and the non-light spot radiation flow are assigned to the simulated light spot area and the simulated non-light spot area respectively;

[0017] The inner wall of the black cavity model and the surface of the target pellet model are respectively divided into a plurality of small facets, correspondingly obtaining black cavity small facets and target pellet small facets; wherein the black cavity small facets include light spot area small facets and non-light spot area small facets.

[0018] Preferably, the inner wall of the black cavity model and the surface of the target pellet model are divided into a plurality of small facets, respectively, to obtain black cavity small facets and target pellet small facets, specifically including:

[0019] The inner wall of the preset ICF black cavity is divided into a plurality of black cavity small facets; wherein the black cavity small facets located on the simulated light spot area are the light spot area small facets, and the black cavity small facets located on the simulated non-light spot area are the non-light spot area small facets;

[0020] Dividing the surface of the target pellet model into a plurality of target pellet small facets; wherein the areas of the plurality of target pellet small facets are equal;

[0021] Connect the several black cavity small facets with the center of the target pill small facet to obtain several facet connection lines, and determine that there is a corresponding relationship between the target pill small facets and the black cavity small facets through which each facet connection line passes; wherein one target pill small facet corresponds to several black cavity small facets.

[0022] Further, the 4 incident on the ICF target pellet is calculated based on the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Space X-ray radiation flow distribution, including:

[0023] According to the spot radiation flow and the small facets of the spot area corresponding to each small facet of the target pellet, the X-ray radiation flow from the simulated spot area and incident on each small facet of the target pellet is calculated to obtain the spot radiation flow corresponding to each small facet of the target pellet;

[0024] According to the non-spot radiation flow and the small facets of the non-spot area corresponding to each of the small facets of the target pellet, the X-ray radiation flow from the simulated non-spot area and incident on each of the small facets of the target pellet is calculated to obtain the non-spot radiation flow corresponding to each of the small facets of the target pellet;

[0025] According to the spot radiation flow corresponding to each small facet of the target pellet and the non-spot radiation flow corresponding to the small facet of the target pellet, the 4 incident on the ICF target pellet is obtained by summing up. Distribution of spatial X-ray radiation flux.

[0026] Preferably, the calculating of the X-ray radiation flow from the simulated spot area and incident on each of the target pellet small facets according to the spot radiation flow and the spot area small facets corresponding to each of the target pellet small facets specifically includes:

[0027] The light spot radiation flow corresponding to the target pellet small facet is calculated based on the light spot radiation flow, the number and area of ​​the light spot area small facets corresponding to the target pellet small facets, and the area of ​​the target pellet small facets; wherein the specific calculation formula is:

[0028]

[0029] in, is the spot radiation flow corresponding to the small facet of the target pellet, is the number of small facets in the light spot area corresponding to the small facets of the target pellet, is the light spot radiation flow, is the first pixel corresponding to the target pellet facet x The area of ​​the small facet of the light spot area, is the area of ​​the small facet of the target pellet, is the preset spot viewing factor and the specific calculation formula of the preset spot viewing factor is:

[0030]

[0031] in, For the x The normal of the small facet of the spot area corresponding to the small facet of the target pellet and the x The angle between the small facets of the light spot area corresponding to the small facets of the target pill and the connecting line of the small facets of the target pill, is the normal of the small facet of the target pellet and the x The angle between the small facets of the light spot area corresponding to the small facets of the target pill and the connecting line of the small facets of the target pill, For the x The length of the line connecting the small facet element of the light spot area corresponding to the small facet element of the target pill and the small facet element of the target pill.

[0032] Preferably, the calculating of the X-ray radiation flow from the simulated non-spot area and incident on each of the target pellet small facets according to the non-spot radiation flow and the non-spot area small facets corresponding to each of the target pellet small facets specifically includes:

[0033] According to the non-spot radiation flow, the number and area of ​​the small facets in the non-spot area corresponding to the small facet of the target pellet, and the area of ​​the small facet of the target pellet, the non-spot radiation flow corresponding to the small facet of the target pellet is calculated; wherein the specific calculation formula is:

[0034]

[0035] in, is the non-spot radiation flow corresponding to the small facet of the target pellet, is the number of small facets in the non-spot area corresponding to the small facets of the target pellet, is the non-spot radiation flow, is the first pixel corresponding to the target pellet facet z The area of ​​the small facet in the non-spot area, is the area of ​​the small facet of the target pellet, is a preset non-spot viewing factor and the specific calculation formula of the preset non-spot viewing factor is:

[0036]

[0037] in, For the z The normal of the small facet of the non-spot area corresponding to the small facet of the target pellet and the z The angle between the small facet of the non-spot area corresponding to the small facet of the target pellet and the line connecting the small facet of the target pellet, is the normal of the small facet of the target pellet and the z The angle between the small facet of the non-spot area corresponding to the small facet of the target pellet and the line connecting the small facet of the target pellet, For the z The length of the line connecting the small facet of the non-spot area corresponding to the small facet of the target pill and the small facet of the target pill.

[0038] Furthermore, the spot radiation flow corresponding to each of the small facets of the target pellet and the non-spot radiation flow corresponding to the small facets of the target pellet are summed to obtain the 4 incident on the ICF target pellet. The specific summation formula for the spatial X-ray radiation flow distribution is:

[0039]

[0040] in, is the 4 incident on the ICF target pellet Space X-ray radiation flow distribution, is the ordinal number of the target pellet facet, For the The spot radiation flow corresponding to each of the small surface elements of the target pellet is: For the The non-spot radiation flow corresponding to the small surface element of the target pellet.

[0041] Another embodiment of the present invention provides an in-situ measurement device for incident ICF target pellet X-ray radiation flow, comprising: a transmitting module, a measuring module and a calculating module;

[0042] The transmitting module is used to transmit a laser beam into a preset ICF black cavity, the laser beam irradiates the inner wall of the preset ICF black cavity to form a light spot area, and determines that the area on the inner wall of the preset ICF black cavity except the light spot area is a non-light spot area;

[0043] The measuring module is used to measure the X-ray radiation flow of the spot area and the non-spot area respectively, and obtain the spot radiation flow and the non-spot radiation flow accordingly;

[0044] The calculation module is used to construct a black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet, and obtain the 4 incident on the ICF target pellet according to the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Spatial X-ray radiation flow distribution; wherein the ICF target pellet is located inside the preset ICF black cavity.

[0045] Compared with the prior art, the beneficial effects of the present invention are:

[0046] By measuring the X-ray radiation flux in the spot area and non-spot area of ​​the black cavity, a model consistent with the experimental black cavity-target capsule was established. After assigning the radiation flux and Lambertian emission properties, the researchers were able to directly measure the 4 The spatial X-ray radiation flux distribution avoids the influence of the shrinkage effect and improves the experimental measurement capability of the X-ray radiation flux. It has very important and broad application prospects in the indirect drive implosion experiments of various types of black cavity targets in ICF. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic flow chart of an in-situ measurement method of an incident ICF target pellet X-ray radiation flux provided by an embodiment of the present invention.

[0048] Figure 2 A schematic structural diagram of a black cavity-target pellet model provided in one embodiment of the present invention.

[0049] Figure 3 A schematic structural diagram of an in-situ measurement device for incident ICF target pellet X-ray radiation flux provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0050] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0051] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0052] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0053] Reference Figure 1 , is a flow chart of an in-situ measurement method of an incident ICF target pellet X-ray radiation flux provided by an embodiment of the present invention, comprising the following steps:

[0054] S1: emitting a laser beam into a preset ICF black cavity, wherein the laser beam irradiates an inner wall of the preset ICF black cavity to form a light spot area, and determining an area on the inner wall of the preset ICF black cavity other than the light spot area as a non-light spot area;

[0055] S2: measuring the X-ray radiation flow of the spot area and the non-spot area respectively, and obtaining the spot radiation flow and the non-spot radiation flow correspondingly;

[0056] S3: constructing a black cavity-target capsule model according to the preset ICF black cavity and the ICF target capsule, and obtaining the 4 incident on the ICF target capsule according to the black cavity-target capsule model, the spot radiation flow and the non-spot radiation flow. Spatial X-ray radiation flow distribution; wherein the ICF target pellet is located inside the preset ICF black cavity.

[0057] For step S1, specifically, emitting an X-ray laser beam to an ICF target pellet in a preset ICF black cavity, wherein the X-ray laser beam forms a light spot area on an inner wall of the preset ICF black cavity after being reflected, specifically includes:

[0058] The surface of the preset ICF black cavity is provided with a plurality of injection ports, and the X-ray laser beam enters the preset ICF black cavity from the plurality of injection ports respectively, and after being reflected by the ICF target pellet, forms a plurality of the light spot areas on the inner wall of the preset ICF black cavity.

[0059] In a preferred embodiment, the preset ICF black cavity is one of the black cavities commonly used in indirect drive ICF implosion experiments, such as a six-hole spherical cavity, a cylindrical cavity, a six-way cylindrical cavity, etc. In this preferred embodiment, a six-hole spherical cavity is selected as the preset ICF black cavity.

[0060] The many X-ray laser beams enter the preset ICF black cavity from the six injection ports on the surface of the preset ICF black cavity respectively, and after being reflected by the ICF target pellet, multiple light spot areas are formed on the inner wall of the preset ICF black cavity, and the other areas on the inner wall of the preset ICF black cavity are non-light spot areas.

[0061] For step S2, specifically, the step of measuring the X-ray radiation flows of the spot area and the non-spot area respectively to obtain the spot radiation flow and the non-spot radiation flow specifically includes:

[0062] The X-ray radiation flows in the spot area and the non-spot area are measured respectively by two sets of preset spatially resolved radiation flow detection equipment; wherein the preset spatially resolved radiation flow detection equipment is a device that realizes spatially resolved detection of the X-ray radiation flow emitted by a small radiation source based on the principles of pinhole imaging and limited aperture selection, and the field of view size of the preset spatially resolved radiation flow detection equipment does not exceed the preset field of view threshold.

[0063] In a preferred embodiment, two sets of the preset spatially resolved radiation flow detection devices can simultaneously measure the X-ray radiation flow in the spot area and the non-spot area, respectively, to obtain the spot radiation flow and the non-spot radiation flow, which are expressed in W / cm 2 As a unit.

[0064] In this preferred embodiment, the field of view of the two sets of the preset spatial resolution radiation flow detection equipment is 200um, which is significantly smaller than the size of the usual black cavity injection port of more than 800um. Therefore, the shrinkage effect of the black cavity injection port can be avoided, and then no numerical simulation is required in subsequent measurements, and there is no energy loss phenomenon, which improves the measurement efficiency of the X-ray radiation flow.

[0065] For step S3, specifically, constructing a black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet specifically includes:

[0066] According to the preset ICF black cavity and the light spot area, a black cavity model having the same structure and size as the preset ICF black cavity is constructed, and a target pellet model having the same structure and size as the ICF target pellet is also arranged at the inner center of the black cavity model, and the black cavity model and the target pellet model constitute the black cavity-target pellet model; wherein the black cavity model also has Lambertian emission properties;

[0067] According to the size and position of the light spot area, a simulated light spot area and a simulated non-light spot area are set on the inner wall of the black cavity model, and the light spot radiation flow and the non-light spot radiation flow are assigned to the simulated light spot area and the simulated non-light spot area respectively;

[0068] The inner wall of the black cavity model and the surface of the target pellet model are respectively divided into a plurality of small facets, correspondingly obtaining black cavity small facets and target pellet small facets; wherein the black cavity small facets include light spot area small facets and non-light spot area small facets.

[0069] Preferably, the inner wall of the black cavity model and the surface of the target pellet model are divided into a plurality of small facets, respectively, to obtain black cavity small facets and target pellet small facets, specifically including:

[0070] The inner wall of the preset ICF black cavity is divided into a plurality of black cavity small facets; wherein the black cavity small facets located on the simulated light spot area are the light spot area small facets, and the black cavity small facets located on the simulated non-light spot area are the non-light spot area small facets;

[0071] Dividing the surface of the target pellet model into a plurality of target pellet small facets; wherein the areas of the plurality of target pellet small facets are equal;

[0072] Connect the several black cavity small facets with the center of the target pill small facet respectively to obtain several facet connection lines, and determine that there is a corresponding relationship between the target pill small facet through which each facet connection line passes and the black cavity small facet corresponding to the facet connection line; wherein, one target pill small facet corresponds to several black cavity small facets.

[0073] In a preferred embodiment, after the spot radiation flow and the non-spot radiation flow are measured, a black cavity-target pellet model corresponding to the preset ICF black cavity used in the experiment needs to be constructed. Figure 2 , is a schematic structural diagram of a black cavity-target pill model provided in one embodiment of the present invention.

[0074] Depend on Figure 2 It can be seen that the structure and size of the black cavity-target pill model are the same as those of the preset ICF black cavity, and a target pill model with the same structure and size as the ICF target pill is also constructed inside the black cavity-target pill model. At the same time, according to the corresponding position of the spot area on the inner wall of the preset ICF black cavity, the inner wall of the black cavity-target pill model is also provided with a corresponding simulated spot area and simulated non-spot area, and the measured spot radiation flow and non-spot radiation flow are also assigned to the simulated spot area and simulated non-spot area. In addition, the black cavity-target pill model is also given the Lambertian emission property.

[0075] After constructing the black cavity-target pellet model and the target pellet model, it is also necessary to divide the inner wall of the black cavity-target pellet model and the surface of the target pellet model to obtain the corresponding spherical cavity small facets and target pellet small facets. Among them, the areas of each target pellet small facet are equal, while the areas of each spherical cavity small facet are not necessarily equal, and can be adjusted according to actual conditions. After dividing the small facets, it is also necessary to establish the corresponding relationship between each spherical cavity small facet and each target pellet small facet, so as to subsequently calculate the X-ray radiation flow incident on each target pellet small facet.

[0076] For step S3, further, the 4 incident on the ICF target pellet is calculated based on the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Space X-ray radiation flow distribution, including:

[0077] According to the spot radiation flow and the small facets of the spot area corresponding to each small facet of the target pellet, the X-ray radiation flow from the simulated spot area and incident on each small facet of the target pellet is calculated to obtain the spot radiation flow corresponding to each small facet of the target pellet;

[0078] According to the non-spot radiation flow and the small facets of the non-spot area corresponding to each of the small facets of the target pellet, the X-ray radiation flow from the simulated non-spot area and incident on each of the small facets of the target pellet is calculated to obtain the non-spot radiation flow corresponding to each of the small facets of the target pellet;

[0079] According to the spot radiation flow and the non-spot radiation flow corresponding to each small facet of the target pellet, the 4 incident on the ICF target pellet is calculated. Distribution of spatial X-ray radiation flux.

[0080] The calculating, according to the spot radiation flow and the spot area small facets corresponding to the target pellet small facets, the X-ray radiation flow from the simulated spot area and incident on each of the target pellet small facets specifically includes:

[0081] The light spot radiation flow corresponding to the target pellet small facet is calculated based on the light spot radiation flow, the number and area of ​​the light spot area small facets corresponding to the target pellet small facets, and the area of ​​the target pellet small facets; wherein the specific calculation formula is:

[0082]

[0083] in, is the spot radiation flow corresponding to the small facet of the target pellet, is the number of small facets in the light spot area corresponding to the small facets of the target pellet, is the light spot radiation flow, is the first pixel corresponding to the target pellet facet x The area of ​​the small facet of the light spot area, is the area of ​​the small facet of the target pellet, is the preset spot viewing factor and the specific calculation formula of the preset spot viewing factor is:

[0084]

[0085] in, For the x The normal of the small facet of the spot area corresponding to the small facet of the target pellet and the x The angle between the small facet of the light spot area corresponding to the small facet of the target pill and the line connecting the small facet of the target pill, is the normal of the small facet of the target pellet and the x The angle between the small facet of the light spot area corresponding to the small facet of the target pill and the line connecting the small facet of the target pill, For the x The length of the line connecting the small facet element of the light spot area corresponding to the small facet element of the target pill and the small facet element of the target pill.

[0086] Preferably, the calculating of the X-ray radiation flow from the simulated non-spot area and incident on each of the target pellet small facets according to the non-spot radiation flow and the non-spot area small facets corresponding to each of the target pellet small facets specifically includes:

[0087] According to the non-spot radiation flow, the number and area of ​​the small facets in the non-spot area corresponding to the small facet of the target pellet, and the area of ​​the small facet of the target pellet, the non-spot radiation flow corresponding to the small facet of the target pellet is calculated; wherein the specific calculation formula is:

[0088]

[0089] in, is the non-spot radiation flow corresponding to the small facet of the target pellet, is the number of small facets in the non-spot area corresponding to the small facets of the target pellet, is the non-spot radiation flow, is the first pixel corresponding to the target pellet facet z The area of ​​the small facet in the non-spot area, is the area of ​​the small facet of the target pellet, is a preset non-spot viewing factor and the specific calculation formula of the preset non-spot viewing factor is:

[0090]

[0091] in, For the z The normal of the small facet of the non-spot area corresponding to the small facet of the target pellet and the z The angle between the small facet of the non-spot area corresponding to the small facet of the target pellet and the line connecting the small facet of the target pellet, is the normal of the small facet of the target pellet and the z The angle between the small facet of the non-spot area corresponding to the small facet of the target pellet and the line connecting the small facet of the target pellet, For the z The length of the line connecting the small facet of the non-spot area corresponding to the small facet of the target pill and the small facet of the target pill.

[0092] Furthermore, the spot radiation flow corresponding to each of the small facets of the target pellet and the non-spot radiation flow corresponding to the small facets of the target pellet are summed to obtain the 4 incident on the ICF target pellet. The specific summation formula for the spatial X-ray radiation flow distribution is:

[0093]

[0094] in, is the 4 incident on the ICF target pellet Space X-ray radiation flow distribution, is the ordinal number of the target pellet facet, For the The spot radiation flow corresponding to each of the small surface elements of the target pellet is: For the The non-spot radiation flow corresponding to the small surface element of the target pellet.

[0095] In a preferred embodiment, based on the viewing factor, the spot radiation flow and non-spot radiation flow corresponding to each small facet of the target capsule are calculated respectively, and then the spot radiation flow and non-spot radiation flow corresponding to all small facets of the target capsule are summed to obtain the total X-ray radiation flow incident on the ICF target capsule.

[0096] The in-situ measurement method of the incident ICF target pellet X-ray radiation flux provided by the embodiment of the present invention can make the uncertainty of the total X-ray radiation flux obtained by measurement less than 13%, and the measurement efficiency is significantly better than the indirect measurement method in the prior art. This method realizes the direct in-situ measurement of the incident ICF target pellet X-ray radiation flux, and the measurement result is accurate and reliable, and there is no change to the structure of the black cavity and the target pellet. It solves the problem of incident target pellet radiation flux detection that has plagued the ICF field for more than 70 years, and will have a very important and broad application prospect in the indirect drive implosion experiments of various ICF target types.

[0097] Reference Figure 3 , is a schematic structural diagram of an in-situ measurement device for incident ICF target pellet X-ray radiation flow provided by another embodiment of the present invention, comprising: a transmitting module 101, a measuring module 102 and a calculating module 103;

[0098] The transmitting module 101 is used to transmit a laser beam into a preset ICF black cavity, the laser beam irradiates the inner wall of the preset ICF black cavity to form a light spot area, and determines that the area on the inner wall of the preset ICF black cavity except the light spot area is a non-light spot area;

[0099] The measuring module 102 is used to measure the X-ray radiation flow of the spot area and the non-spot area respectively, and obtain the spot radiation flow and the non-spot radiation flow accordingly;

[0100] The calculation module 103 is used to construct a black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet, and obtain the 4 incident on the ICF target pellet according to the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Spatial X-ray radiation flow distribution; wherein the ICF target pellet is located inside the preset ICF black cavity.

[0101] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An in-situ measurement method of X-ray radiation flux incident on an ICF target pellet, characterized in that: The following steps are involved: Emitting a laser beam into a preset ICF black cavity, the laser beam irradiating an inner wall of the preset ICF black cavity to form a light spot area, and determining an area on the inner wall of the preset ICF black cavity other than the light spot area as a non-light spot area; Measuring the X-ray radiation flow of the spot area and the non-spot area respectively, and obtaining the spot radiation flow and the non-spot radiation flow accordingly; A black cavity-target pellet model is constructed according to the preset ICF black cavity and the ICF target pellet, and the 4 incident on the ICF target pellet is obtained according to the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Spatial X-ray radiation flow distribution; wherein the ICF target pellet is located inside the preset ICF black cavity; The step of constructing a black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet specifically includes: According to the preset ICF black cavity and the light spot area, a black cavity model having the same structure and size as the preset ICF black cavity is constructed, and a target pellet model having the same structure and size as the ICF target pellet is also arranged at the inner center of the black cavity model, and the black cavity model and the target pellet model constitute the black cavity-target pellet model; wherein the black cavity model also has Lambertian emission properties; According to the size and position of the light spot area, a simulated light spot area and a simulated non-light spot area are set on the inner wall of the black cavity model, and the light spot radiation flow and the non-light spot radiation flow are assigned to the simulated light spot area and the simulated non-light spot area respectively; The inner wall of the black cavity model and the surface of the target pellet model are respectively divided into a plurality of small facets, and the black cavity small facets and the target pellet small facets are obtained correspondingly; wherein the black cavity small facets include the light spot area small facets and the non-light spot area small facets; wherein one target pellet small facet corresponds to a plurality of the black cavity small facets; The 4 incident on the ICF target pellet is calculated based on the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Space X-ray radiation flow distribution, including: According to the spot radiation flow and the small facets of the spot area corresponding to each of the small facets of the target pellet, the X-ray radiation flow from the simulated spot area and incident on each of the small facets of the target pellet is calculated to obtain the spot radiation flow corresponding to each of the small facets of the target pellet, specifically: The light spot radiation flow corresponding to the target pellet small facet is calculated based on the light spot radiation flow, the number and area of ​​the light spot area small facets corresponding to the target pellet small facets, and the area of ​​the target pellet small facets; wherein the specific calculation formula is: in, is the spot radiation flow corresponding to the small facet of the target pellet, is the ordinal number of the target pellet facet, is the number of small facets in the light spot area corresponding to the small facets of the target pellet, is the light spot radiation flow, is the first pixel corresponding to the target pellet facet x The area of ​​the small facet of the light spot area, is the area of ​​the small facet of the target pellet, is the preset spot viewing factor; According to the non-spot radiation flow and the small facets of the non-spot area corresponding to each of the small facets of the target pellet, the X-ray radiation flow from the simulated non-spot area and incident on each of the small facets of the target pellet is calculated to obtain the non-spot radiation flow corresponding to each of the small facets of the target pellet, specifically: According to the non-spot radiation flow, the number and area of ​​the small facets in the non-spot area corresponding to the small facet of the target pellet, and the area of ​​the small facet of the target pellet, the non-spot radiation flow corresponding to the small facet of the target pellet is calculated; wherein the specific calculation formula is: in, is the non-spot radiation flow corresponding to the small facet of the target pellet, is the ordinal number of the target pellet facet, is the number of small facets in the non-spot area corresponding to the small facets of the target pellet, is the non-spot radiation flow, is the first pixel corresponding to the target pellet facet z The area of ​​the small facet in the non-spot area, is the area of ​​the small facet of the target pellet, The default non-spot viewing factor According to the spot radiation flow and the non-spot radiation flow corresponding to each small facet of the target pellet, the 4 incident on the ICF target pellet is obtained by summing up. Distribution of spatial X-ray radiation flux.

2. The in-situ measurement method of incident ICF target pellet X-ray radiation flux according to claim 1, characterized in that: The emitting a laser beam into a preset ICF black cavity, wherein the laser beam is irradiated on an inner wall of the preset ICF black cavity to form a light spot area, specifically includes: The surface of the preset ICF black cavity is provided with a plurality of injection ports, and the laser beams respectively enter the interior of the preset ICF black cavity from the plurality of injection ports, forming a plurality of light spot areas on the inner wall of the preset ICF black cavity.

3. The in-situ measurement method of incident ICF target pellet X-ray radiation flux according to claim 1, characterized in that: The step of respectively measuring the X-ray radiation flows of the spot area and the non-spot area to correspondingly obtain the spot radiation flow and the non-spot radiation flow specifically includes: The X-ray radiation flows in the spot area and the non-spot area are measured respectively by two sets of preset spatially resolved radiation flow detection equipment; wherein the preset spatially resolved radiation flow detection equipment is a device that realizes spatially resolved detection of the X-ray radiation flow emitted by a small radiation source based on the principles of pinhole imaging and limited aperture selection, and the field of view size of the preset spatially resolved radiation flow detection equipment does not exceed the preset field of view threshold.

4. The in-situ measurement method of incident ICF target pellet X-ray radiation flux according to claim 1, characterized in that: The inner wall of the black cavity model and the surface of the target pellet model are divided into a plurality of small facets, respectively, to obtain black cavity small facets and target pellet small facets, specifically including: The inner wall of the preset ICF black cavity is divided into a plurality of black cavity small facets; wherein the black cavity small facets located on the simulated light spot area are the light spot area small facets, and the black cavity small facets located on the simulated non-light spot area are the non-light spot area small facets; Dividing the surface of the target pellet model into a plurality of target pellet small facets; wherein the areas of the plurality of target pellet small facets are equal; Connect the several black cavity small facets with the center of the target pill small facet respectively to obtain several facet connection lines, and determine whether there is a corresponding relationship between the target pill small facet through which each facet connection line passes and the black cavity small facet corresponding to the facet connection line.

5. The in-situ measurement method of incident ICF target pellet X-ray radiation flux according to claim 1, characterized in that: Said in, For the x The normal of the small facet of the spot area corresponding to the small facet of the target pellet and the x The angle between the small facets of the light spot area corresponding to the small facets of the target pill and the connecting line of the small facets of the target pill, is the normal of the small facet of the target pellet and the x The angle between the small facets of the light spot area corresponding to the small facets of the target pill and the connecting line of the small facets of the target pill, For the x The length of the line connecting the small facet element of the light spot area corresponding to the small facet element of the target pill and the small facet element of the target pill.

6. The in-situ measurement method of incident ICF target pellet X-ray radiation flux according to claim 1, characterized in that: Said in, For the z The normal of the small facet of the non-spot area corresponding to the small facet of the target pellet and the z The angle between the small facet of the non-spot area corresponding to the small facet of the target pellet and the line connecting the small facet of the target pellet, is the normal of the small facet of the target pellet and the z The angle between the small facet of the non-spot area corresponding to the small facet of the target pellet and the line connecting the small facet of the target pellet, For the z The length of the line connecting the small facet of the non-spot area corresponding to the small facet of the target pill and the small facet of the target pill.

7. The in-situ measurement method of incident ICF target pellet X-ray radiation flux according to claim 1, characterized in that: The light spot radiation flow corresponding to each of the small facets of the target pellet and the non-spot radiation flow corresponding to the small facets of the target pellet are summed to obtain the 4 incident on the ICF target pellet. The specific summation formula for the spatial X-ray radiation flow distribution is: in, is the 4 incident on the ICF target pellet Space X-ray radiation flow distribution, is the ordinal number of the target pellet facet, For the The spot radiation flow corresponding to each of the small surface elements of the target pellet is: For the The non-spot radiation flow corresponding to the small surface element of the target pellet.

8. An in-situ measurement device for incident ICF target pellet X-ray radiation flux, characterized in that: include: Transmitting module, measuring module and calculating module; The transmitting module is used to transmit a laser beam into a preset ICF black cavity, the laser beam irradiates the inner wall of the preset ICF black cavity to form a light spot area, and determines that the area on the inner wall of the preset ICF black cavity except the light spot area is a non-light spot area; The measuring module is used to measure the X-ray radiation flow of the spot area and the non-spot area respectively, and obtain the spot radiation flow and the non-spot radiation flow accordingly; The calculation module is used to construct a black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet, and obtain the 4 incident on the ICF target pellet according to the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Spatial X-ray radiation flow distribution; wherein the ICF target pellet is located inside the preset ICF black cavity; The step of constructing a black cavity-target pellet model according to the preset ICF black cavity and the ICF target pellet specifically includes: According to the preset ICF black cavity and the light spot area, a black cavity model having the same structure and size as the preset ICF black cavity is constructed, and a target pellet model having the same structure and size as the ICF target pellet is also arranged at the inner center of the black cavity model, and the black cavity model and the target pellet model constitute the black cavity-target pellet model; wherein the black cavity model also has Lambertian emission properties; According to the size and position of the light spot area, a simulated light spot area and a simulated non-light spot area are set on the inner wall of the black cavity model, and the light spot radiation flow and the non-light spot radiation flow are assigned to the simulated light spot area and the simulated non-light spot area respectively; The inner wall of the black cavity model and the surface of the target pellet model are respectively divided into a plurality of small facets, and the black cavity small facets and the target pellet small facets are obtained correspondingly; wherein the black cavity small facets include the light spot area small facets and the non-light spot area small facets; wherein one target pellet small facet corresponds to a plurality of the black cavity small facets; The 4 incident on the ICF target pellet is calculated based on the black cavity-target pellet model, the spot radiation flow and the non-spot radiation flow. Space X-ray radiation flow distribution, including: According to the spot radiation flow and the small facets of the spot area corresponding to each of the small facets of the target pellet, the X-ray radiation flow from the simulated spot area and incident on each of the small facets of the target pellet is calculated to obtain the spot radiation flow corresponding to each of the small facets of the target pellet, specifically: The light spot radiation flow corresponding to the target pellet small facet is calculated based on the light spot radiation flow, the number and area of ​​the light spot area small facets corresponding to the target pellet small facets, and the area of ​​the target pellet small facets; wherein the specific calculation formula is: in, is the spot radiation flow corresponding to the small facet of the target pellet, is the ordinal number of the target pellet facet, is the number of small facets in the light spot area corresponding to the small facets of the target pellet, is the light spot radiation flow, is the first pixel corresponding to the target pellet facet x The area of ​​the small facet of the light spot area, is the area of ​​the small facet of the target pellet, is the preset spot viewing factor; According to the non-spot radiation flow and the small facets of the non-spot area corresponding to each of the small facets of the target pellet, the X-ray radiation flow from the simulated non-spot area and incident on each of the small facets of the target pellet is calculated to obtain the non-spot radiation flow corresponding to each of the small facets of the target pellet, specifically: According to the non-spot radiation flow, the number and area of ​​the small facets in the non-spot area corresponding to the small facet of the target pellet, and the area of ​​the small facet of the target pellet, the non-spot radiation flow corresponding to the small facet of the target pellet is calculated; wherein the specific calculation formula is: in, is the non-spot radiation flow corresponding to the small facet of the target pellet, is the ordinal number of the target pellet facet, is the number of small facets in the non-spot area corresponding to the small facets of the target pellet, is the non-spot radiation flow, is the first pixel corresponding to the target pellet facet z The area of ​​the small facet in the non-spot area, is the area of ​​the small facet of the target pellet, The default non-spot viewing factor According to the spot radiation flow and the non-spot radiation flow corresponding to each small facet of the target pellet, the 4 incident on the ICF target pellet is obtained by summing up. Distribution of spatial X-ray radiation flux.

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