In-situ measurement method, system and computer storage medium for albedo of black cavity wall in ICF

Abstract

The present invention discloses an in-situ measurement method, system and computer storage medium of the albedo of a black cavity wall in an ICF, comprising: in an ICF laser target shooting experiment, two sets of spatially resolved radiation flow detection equipment are used to respectively and simultaneously measure the X-ray radiation flow of a spot area and a re-emission area on the inner wall of the black cavity; a black cavity model identical to the black cavity used in the ICF laser target shooting experiment is constructed; the measured X-ray radiation flow of the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission property are assigned to the corresponding area of ​​the inner wall of the black cavity model; in the black cavity model, the incident X-ray radiation flow of the re-emission area to be measured of the black cavity model is summed by a view factor to obtain the incident radiation flow of the re-emission area to be measured of the black cavity model; the albedo of the black cavity wall is obtained according to the incident radiation flow of the re-emission area to be measured of the black cavity model and the measured X-ray radiation flow of the re-emission area. The present invention does not change the black cavity structure, and the measured albedo result is accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray radiation flow detection in ICF, and more specifically, to an in-situ measurement method, system and computer storage medium for the albedo of a black cavity wall in an ICF. Background Art

[0002] In indirect-drive laser inertial confinement fusion (ICF), the albedo of the black cavity wall is a key parameter closely related to the black cavity energetics and the driving symmetry of the target pellet. It is defined as the ratio of the re-emitted X-ray radiation flux on the black cavity wall to the incident radiation flux. It is not only a physical quantity representing the state of local thermo-dynamic equilibrium (LTE), but also an important parameter for evaluating the thermal insulation performance of the black cavity. Since the sensitive surface of the conventional radiation flux detector is significantly larger than the black cavity size (cm level VS mm level), it is difficult to directly measure the re-emitted X-ray radiation flux and the incident radiation flux on the black cavity wall. At present, there are two indirect methods for measuring the albedo at home and abroad. One is to dig diagnostic holes on the black cavity wall facing the light spot and the re-emission area respectively, and derive the albedo by measuring the radiation flux of the light spot and the re-emission area ejected from the diagnostic holes and combining with theoretical formulas. The other method is to use an artificial two-stage black cavity. In two experiments, the outgoing X-ray radiation flux of the primary black cavity is measured as the incident X-ray radiation flux of the secondary black cavity, and the outgoing X-ray radiation flux of the secondary black cavity is measured, and then the albedo is derived based on the theoretical formula.

[0003] However, the existing albedo measurement methods have the following shortcomings:

[0004] 1. Digging diagnostic holes on the black cavity wall destroys the black cavity structure and affects the circulation characteristics of the X-ray radiation flow in the black cavity;

[0005] 2. The shrinkage effect caused by the diagnostic hole brings a large uncertainty to the measurement of X-ray radiation flux;

[0006] 3. The two-stage black cavity measurement method reduces the X-ray in the actual single black cavity to nearly 2 The spatial incident re-emission area is changed to less than 0.25 The spatial incident re-emission region leads to an under-measurement of the incident X-ray radiation flux, and also destroys the circulation characteristics of the X-ray radiation flux in the black cavity. Summary of the invention

[0007] One of the purposes of the present invention is to provide an in-situ measurement method for the albedo of the black cavity wall in an ICF, so as to solve the technical problem in the prior art of inaccurate measurement of the albedo of the black cavity wall due to the destruction of the circulation characteristics of the X-ray radiation flow in the black cavity, the shrinkage effect and the change of the X-ray incident angle range; the second purpose of the present invention is to provide an in-situ measurement system for the albedo of the black cavity wall in an ICF; the third purpose of the present invention is to provide a computer storage medium.

[0008] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0009] A first aspect of the present invention provides an in-situ measurement method for the albedo of a black cavity wall in an ICF, comprising:

[0010] In the ICF laser target shooting experiment, two sets of spatially resolved radiation flux detection equipment were used to simultaneously measure the X-ray radiation flux in the spot area and the re-emission area on the inner wall of the black cavity;

[0011] Construct a hohlraum model identical to the one used in the ICF laser target shooting experiment;

[0012] Assigning the measured X-ray radiation flow in the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission properties to the corresponding area on the inner wall of the black cavity model;

[0013] In the black cavity model, summing the incident X-ray radiation flux of the re-emission region to be measured of the black cavity model by the view factor to obtain the incident radiation flux of the re-emission region to be measured of the black cavity model;

[0014] The black cavity wall albedo is obtained according to the incident radiation flux in the re-emission zone to be measured of the black cavity model and the measured X-ray radiation flux in the re-emission zone.

[0015] Furthermore, the spatially resolved radiation flow detection device can quantitatively and accurately measure the X-ray radiation flow emitted from a specific small area in the black cavity through pinhole imaging combined with aperture-limiting selection.

[0016] Furthermore, the field of view diameter of the spatially resolved radiation flow detection device is no greater than 200 microns.

[0017] Furthermore, a black cavity model identical to the black cavity used in the ICF laser target shooting experiment was constructed, including:

[0018] A black cavity model is constructed so that the size, structure, spot position and size of the black cavity model are the same as those of the black cavity used in the ICF laser target shooting experiment.

[0019] Furthermore, the black cavity model is constructed based on geometric optics and finite element method.

[0020] Furthermore, summing the incident X-ray radiation flux of the re-emission region to be measured of the black cavity model by using the view factor comprises:

[0021]

[0022]

[0023] in, represents the incident radiation flux of the re-emission region to be measured in the hohlraum model, represents the number of bins in the re-emission region to be measured of the black cavity model, The face element representing the re-emission region to be measured of the black cavity model The incident X-ray radiation flux, The face element representing the re-emission region to be measured of the black cavity model The area of represents the number of bins in the re-emission region other than the re-emission region to be measured in the black cavity model, Represents the number of facets in the spot area, , represent the X-ray radiation flows in the spot area and the re-emission area, respectively. , Represents the surface element of the spot area and the bins of the re-emission region other than the re-emission region to be measured The area of , Represents the viewing factor.

[0024] Furthermore, the viewing angle factor , ,include:

[0025]

[0026]

[0027] In the formula, is the surface element of the spot area The normal direction and the surface element connecting the spot area and the bins in the re-emission region to be tested The angle between the straight lines, is the bin of the re-emission region to be measured The normal direction and the surface element connecting the spot area and the bins in the re-emission region to be tested The angle between the straight lines, Represents the surface element connecting the spot area and the bins in the re-emission region to be tested The length of the line segment; is the bin of the re-emission area except the re-emission area to be measured The normal direction and the surface elements connecting the re-emission area other than the re-emission area to be measured and the bins in the re-emission region to be tested The angle between the straight lines, is the bin of the re-emission region to be measured The normal direction and the surface elements connecting the re-emission area other than the re-emission area to be measured and the bins in the re-emission region to be tested The angle between the straight lines, Indicates the facets connecting the retransmission areas other than the retransmission area to be tested and the bins in the re-emission region to be tested The length of the line segment.

[0028] Further, the black cavity wall albedo is obtained according to the incident radiation flux of the re-emission zone to be measured of the black cavity model and the measured X-ray radiation flux of the re-emission zone, including:

[0029]

[0030] In the formula, represents the albedo of the black cavity wall, represents the incident radiation flux of the re-emission region to be measured in the hohlraum model, represents the measured X-ray radiation flux in the re-emission region.

[0031] A second aspect of the present invention provides an in-situ measurement system for the albedo of a black cavity wall in an ICF, wherein the system applies the in-situ measurement method for the albedo of a black cavity wall in an ICF, and the system comprises:

[0032] An experimental module, wherein in an ICF laser target shooting experiment, two sets of spatially resolved radiation flow detection equipment are used to simultaneously measure the X-ray radiation flows in the spot area and the re-emission area on the inner wall of the black cavity;

[0033] A construction module, wherein the module is constructed as a black cavity model that is the same as the black cavity used in the ICF laser target shooting experiment;

[0034] An assignment module, wherein the assignment module assigns the measured X-ray radiation flow in the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission property to the corresponding area on the inner wall of the black cavity model;

[0035] A summing module, wherein the summing module sums the incident X-ray radiation flow of the re-emission zone to be measured of the black cavity model by a view factor in the black cavity model to obtain the incident radiation flow of the re-emission zone to be measured of the black cavity model;

[0036] An albedo solving module is used to obtain the albedo of the black cavity wall according to the incident radiation flux of the re-emission zone to be measured and the measured X-ray radiation flux of the re-emission zone of the black cavity model.

[0037] A third aspect of the present invention provides a computer storage medium having a computer program stored thereon, and when the computer program is executed by a processor, it assists in completing the in-situ measurement method of the albedo of the black cavity wall in the ICF.

[0038] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0039] The in-situ measurement method of the albedo of the black cavity wall in the ICF of the present invention can realize the in-situ direct measurement of the albedo of the cavity wall of various black cavities in the ICF. The actual black cavity is measured directly without digging diagnostic holes on the black cavity wall, without the influence of the shrinkage effect, without damage to the black cavity structure, and without affecting the circulation characteristics of the X-ray radiation flow in the black cavity. The measured albedo result is accurate, and the relative uncertainty is within 12%. Since no changes are made to the actual black cavity, the incidence of X-rays in the black cavity on the re-emission zone is still nearly 2 Therefore, the in-situ non-destructive direct measurement method of the present invention will have a very important and broad application prospect in various types of ICF black cavities. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic flow chart of an in-situ measurement method of the albedo of a black cavity wall in an ICF provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the inner wall of a black cavity in a column cavity provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a module of an in-situ measurement method of the black cavity wall albedo in an ICF provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0044] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0045] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0046] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] Example 1

[0048] This embodiment provides an in-situ measurement method for the albedo of the black cavity wall in an ICF. Figure 1 As shown, including:

[0049] In the ICF laser target shooting experiment, two sets of spatially resolved radiation flux detection equipment were used to simultaneously measure the X-ray radiation flux in the spot area and the re-emission area on the inner wall of the black cavity;

[0050] Construct a hohlraum model identical to the one used in the ICF laser target shooting experiment;

[0051] Assigning the measured X-ray radiation flow in the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission properties to the corresponding area on the inner wall of the black cavity model;

[0052] In the black cavity model, summing the incident X-ray radiation flux of the re-emission region to be measured of the black cavity model by the view factor to obtain the incident radiation flux of the re-emission region to be measured of the black cavity model;

[0053] The black cavity wall albedo is obtained according to the incident radiation flux in the re-emission zone to be measured of the black cavity model and the measured X-ray radiation flux in the re-emission zone.

[0054] Indirect drive laser inertial confinement fusion ICF black cavity, the black cavity can be any type of cylindrical cavity, spherical cavity or six-way cylindrical cavity. Take the cylindrical cavity as an example, refer to Figure 2 Multiple laser beams enter the black cavity through the black cavity injection port and are incident on the inner surface of the black cavity wall to form multiple light spot areas. Other areas on the inner surface of the black cavity wall are called re-emission areas. At this time, two sets of spatially resolved radiation flow detection equipment can simultaneously measure the radiation flow of the light spot area and the re-emission area. and , unit is W / cm 2 The albedo is the ratio of the re-emitted X-ray radiation flux on the black cavity wall to the incident radiation flux. , so the subsequent step only requires obtaining Next, construct the black cavity model as follows Figure 2 As shown in the figure, the size, structure, spot position and size of the black cavity model are exactly the same as those of the actual black cavity. and The values ​​are assigned to the corresponding regions of the black cavity model respectively, and the Lambertian emitter properties are also assigned to the black cavity model. In the black cavity model, the incident X-ray radiation flow of the re-emission region is summed up by the view factor to obtain , finally according to The albedo can be calculated.

[0055] In a further embodiment, the spatially resolved radiation flux detection device performs quantitative and accurate measurement of the X-ray radiation flux emitted from a specific small area in the black cavity through pinhole imaging in combination with aperture-limiting selection.

[0056] In an optional embodiment, the spatial resolution radiation flow detection device card refers to China's public invention patent ZL201510573723.5, and the spatial resolution radiation flow detection device includes a camera, a pinhole lens assembly, a limited aperture imaging plate, a limited aperture plate, and a flat response X-ray detector F-XRD arranged in sequence on the optical path. The pinhole lens assembly includes a pinhole plate and an annular lens, and the pinhole plate is nested in the middle of the annular lens. The limited aperture imaging plate is pasted on the limited aperture plate. The center of the pinhole on the pinhole plate, the center of the limited aperture of the limited aperture imaging plate, the center of the limited aperture of the limited aperture plate and the center of the sensitive surface of the flat response X-ray detector F-XRD are on the same straight line of the optical path. The black cavity is placed in front of the pinhole lens assembly. There is an angle between the camera's line of sight and the straight line of the optical path, and the camera is used to monitor in real time the positional relationship between the visible light image formed by the annular lens on the black cavity injection port and the limited aperture on the limited aperture imaging plate.

[0057] Visible light is emitted from the injection port of the black cavity, and is imaged onto the aperture-limited imaging plate through the annular lens in the pinhole lens assembly, and the positional relationship between the aperture-limited imaging plate and the visible light image of the black cavity is determined. After the X-ray emitted from the injection port of the black cavity passes through the pinhole in the pinhole lens assembly, the X-ray passes through the aperture-limited imaging plate and the aperture-limited plate, and reaches the sensitive surface of the flat response X-ray detector F-XRD, causing the flat response X-ray detector F-XRD to respond. The X-ray energy flow corresponds to the radiation flow of a part of the black cavity injection port from the aperture-limited imaging plate, and at the same time, the aperture-limited imaging plate records the X-ray image formed by the black cavity injection port through the pinhole in the pinhole lens assembly, thus realizing spatially resolved radiation flow measurement.

[0058] In a further embodiment, the field of view diameter of the spatially resolved radiation flow detection device is no greater than 200 microns.

[0059] In this embodiment, the incident X-ray radiation flux of the re-emission zone detected by the spatially resolved radiation flux detection device comes from the spot zone and other remaining re-emission zones.

[0060] In a further embodiment, a black cavity model identical to the black cavity used in the ICF laser target shooting experiment is constructed, including:

[0061] A black cavity model is constructed so that the size, structure, spot position and size of the black cavity model are the same as those of the black cavity used in the ICF laser target shooting experiment.

[0062] In a further embodiment, the black cavity model is constructed based on geometric optics and finite element method.

[0063] In a further embodiment, summing the incident X-ray radiation flux of the re-emission region to be measured of the hohlraum model by the view factor comprises:

[0064]

[0065]

[0066] in, represents the incident radiation flux of the re-emission region to be measured in the hohlraum model, represents the number of bins in the re-emission region to be measured of the black cavity model, The face element representing the re-emission region to be measured of the black cavity model The incident X-ray radiation flux, The face element representing the re-emission region to be measured of the black cavity model The area of represents the number of bins in the re-emission region other than the re-emission region to be measured in the black cavity model, Represents the number of facets in the spot area, , represent the X-ray radiation flows in the spot area and the re-emission area, respectively. , Represents the surface element of the spot area and the bins of the re-emission region other than the re-emission region to be measured The area of , Represents the viewing factor.

[0067] In a further embodiment, the viewing angle factor , ,include:

[0068]

[0069]

[0070] In the formula, is the surface element of the spot area The normal direction and the surface element connecting the spot area and the bins in the re-emission region to be tested The angle between the straight lines, is the bin of the re-emission region to be measured The normal direction and the surface element connecting the spot area and the bins in the re-emission region to be tested The angle between the straight lines, Represents the surface element connecting the spot area and the bins in the re-emission region to be tested The length of the line segment; is the bin of the re-emission area except the re-emission area to be measured The normal direction and the surface elements connecting the re-emission area other than the re-emission area to be measured and the bins in the re-emission region to be tested The angle between the straight lines, is the bin of the re-emission region to be measured The normal direction and the surface elements connecting the re-emission area other than the re-emission area to be measured and the bins in the re-emission region to be tested The angle between the straight lines, Indicates the facets connecting the retransmission areas other than the retransmission area to be tested and the bins in the re-emission region to be tested The length of the line segment.

[0071] In a further embodiment, the black cavity wall albedo is obtained according to the incident radiation flux of the re-emission zone to be measured and the measured X-ray radiation flux of the re-emission zone of the black cavity model, including:

[0072]

[0073] In the formula, represents the albedo of the black cavity wall, represents the incident radiation flux of the re-emission region to be measured in the hohlraum model, represents the measured X-ray radiation flux in the re-emission region.

[0074] Example 2

[0075] This embodiment provides an in-situ measurement system for the albedo of the black cavity wall in an ICF. Figure 3 As shown, the system applies the in-situ measurement method of the black cavity wall albedo in the ICF described in Example 1, and the system includes:

[0076] An experimental module, wherein in an ICF laser target shooting experiment, two sets of spatially resolved radiation flow detection equipment are used to simultaneously measure the X-ray radiation flows in the spot area and the re-emission area on the inner wall of the black cavity;

[0077] A construction module, wherein the module constructs a black cavity model identical to the black cavity used in the ICF laser target shooting experiment;

[0078] An assignment module, wherein the assignment module assigns the measured X-ray radiation flow in the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission property to the corresponding area on the inner wall of the black cavity model;

[0079] A summing module, wherein the summing module sums the incident X-ray radiation flow of the re-emission zone to be measured of the black cavity model by a view factor in the black cavity model to obtain the incident radiation flow of the re-emission zone to be measured of the black cavity model;

[0080] An albedo solving module is used to obtain the albedo of the black cavity wall according to the incident radiation flux of the re-emission zone to be measured and the measured X-ray radiation flux of the re-emission zone of the black cavity model.

[0081] Example 3

[0082] This embodiment provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, it helps to complete the in-situ measurement method of the albedo of the black cavity wall in the ICF described in Example 1.

[0083] The same or similar reference numerals correspond to the same or similar components;

[0084] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0085] 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 for the albedo of a black cavity wall in an ICF, characterized in that: include: In the ICF laser target shooting experiment, two sets of spatially resolved radiation flux detection equipment were used to simultaneously measure the X-ray radiation flux in the spot area and the re-emission area on the inner wall of the black cavity; Construct a hohlraum model identical to the one used in the ICF laser target shooting experiment; Assigning the measured X-ray radiation flow in the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission properties to the corresponding area on the inner wall of the black cavity model; In the black cavity model, summing the incident X-ray radiation flux of the re-emission region to be measured of the black cavity model by the view factor to obtain the incident radiation flux of the re-emission region to be measured of the black cavity model; Obtaining the black cavity wall albedo according to the incident radiation flux of the re-emission zone to be measured of the black cavity model and the measured X-ray radiation flux of the re-emission zone; The incident X-ray radiation flux of the re-emission region to be measured of the black cavity model is summed by the view factor, including: in, represents the incident radiation flux of the re-emission region to be measured in the hohlraum model, represents the number of bins in the re-emission region to be measured of the black cavity model, The face element representing the re-emission region to be measured of the black cavity model The incident X-ray radiation flux, The face element representing the re-emission region to be measured of the black cavity model The area of represents the number of bins in the re-emission region other than the re-emission region to be measured in the black cavity model, Represents the number of facets in the spot area, , represent the X-ray radiation flows in the spot area and the re-emission area, respectively. , Represents the surface element of the spot area and the bins of the re-emission region other than the re-emission region to be measured The area of , Represents the viewing factor.

2. The in-situ measurement method of the reflectivity of the black cavity wall in the ICF according to claim 1, characterized in that: The spatially resolved radiation flow detection device quantitatively and accurately measures the X-ray radiation flow emitted from a specific small area in the black cavity through pinhole imaging combined with aperture-limiting selection.

3. The in-situ measurement method of the albedo of the black cavity wall in the ICF according to claim 2, characterized in that: The field of view diameter of the spatially resolved radiation flow detection device is no greater than 200 microns.

4. The in-situ measurement method of the albedo of the black cavity wall in the ICF according to claim 1, characterized in that: Construct a hohlraum model identical to the one used in the ICF laser target shooting experiment, including: A black cavity model is constructed so that the size, structure, spot position and size of the black cavity model are the same as those of the black cavity used in the ICF laser target shooting experiment.

5. The in-situ measurement method of the albedo of the black cavity wall in the ICF according to claim 4, characterized in that: The black cavity model is constructed based on geometric optics and finite element method.

6. The in-situ measurement method of the albedo of the black cavity wall in the ICF according to claim 1, characterized in that: The viewing factor , ,include: In the formula, is the surface element of the spot area The normal direction and the surface element connecting the spot area and the bins in the re-emission region to be tested The angle between the straight lines, is the bin of the re-emission region to be measured The normal direction and the surface element connecting the spot area and the bins in the re-emission region to be tested The angle between the straight lines, Represents the surface element connecting the spot area and the bins in the re-emission region to be tested The length of the line segment; is the bin of the re-emission area except the re-emission area to be measured The normal direction and the surface elements connecting the re-emission area other than the re-emission area to be measured and the bins in the re-emission region to be tested The angle between the straight lines, is the bin of the re-emission region to be measured The normal direction and the surface elements connecting the re-emission area other than the re-emission area to be measured and the bins in the re-emission region to be tested The angle between the straight lines, Indicates the facets connecting the retransmission areas other than the retransmission area to be tested and the bins in the re-emission region to be tested The length of the line segment.

7. The in-situ measurement method of the albedo of the black cavity wall in the ICF according to claim 1, characterized in that: Obtaining the black cavity wall albedo according to the incident radiation flux of the re-emission zone to be measured of the black cavity model and the measured X-ray radiation flux of the re-emission zone, including: In the formula, represents the albedo of the black cavity wall, represents the incident radiation flux of the re-emission region to be measured in the hohlraum model, represents the measured X-ray radiation flux in the re-emission region.

8. An in-situ measurement system for the albedo of the hohlraum wall in an ICF, characterized in that: The system applies the in-situ measurement method of the black cavity wall albedo in the ICF according to any one of claims 1 to 7, and the system comprises: An experimental module, wherein in an ICF laser target shooting experiment, two sets of spatially resolved radiation flow detection equipment are used to simultaneously measure the X-ray radiation flows in the spot area and the re-emission area on the inner wall of the black cavity; A construction module, wherein the module is constructed as a black cavity model that is the same as the black cavity used in the ICF laser target shooting experiment; An assignment module, wherein the assignment module assigns the measured X-ray radiation flow in the spot area and the re-emission area on the inner wall of the black cavity and the Lambertian emission property to the corresponding area on the inner wall of the black cavity model; A summing module, wherein the summing module sums the incident X-ray radiation flow of the re-emission zone to be measured of the black cavity model by a view factor in the black cavity model to obtain the incident radiation flow of the re-emission zone to be measured of the black cavity model; An albedo solving module is used to obtain the albedo of the black cavity wall according to the incident radiation flux of the re-emission zone to be measured and the measured X-ray radiation flux of the re-emission zone of the black cavity model.

9. A computer storage medium, characterized in that The computer storage medium stores a computer program, and when the computer program is executed by the processor, it assists in completing the in-situ measurement method of the black cavity wall albedo in the ICF according to any one of claims 1 or 4 to 7.

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