A precise diagnosis system and method of implosion shock wave compression process

Abstract

The application discloses a precision diagnosis system and method for implosion shock wave compression process, comprising a driving laser module, a probe laser module, a target pellet module and a VISAR module, the driving laser module causes implosion compression of the target pellet in the target pellet module, the target pellet module is provided with the target pellet, the ellipsoidal reflector is arranged in the target pellet, the probe laser module is arranged outside the target pellet, the probe laser is guided into the inside of the target pellet through the beam splitter, and the ellipsoidal reflector reflects the inside surface of the target pellet, the inside surface of the target pellet is reflected again to obtain reflected light carrying the motion information of the inside surface of the target pellet, the reflected light enters the VISAR module through the first reflector, the reflected light carrying the motion information of the inside surface of the target pellet reaches the etalon in the VISAR module to be converted into interference fringes, sequentially passes through the diaphragm assembly and the cylindrical lens, and finally is imaged at the fringe camera, so that the diagnosis effect of the implosion compression shock wave can be effectively improved, and the wide-angle VISAR technology can be applied to wide-range shock wave diagnosis.

Description

Technical Field

[0001] This invention relates to the field of laser measurement technology, and specifically to a diagnostic system and method for the compression process of an implosion shock wave. Background Technology

[0002] Inertial confinement fusion is one of the important ways to solve future energy problems. In the early stages of an inertial confinement fusion implosion, many factors such as radiation-driven asymmetry, target surface roughness, black cavity structure, and contraction ratio can cause shock wave deformation, resulting in asymmetric initial perturbations, which directly affect implosion efficiency. How to diagnose the compression information of the shock wave during implosion caused by asymmetric perturbations is a key factor in solving this problem. Current diagnostic methods such as X-ray imaging, neutron detection, and ion detection mainly focus on the later stages of implosion. Velocity interferometer system for any reflector (VISAR), as the most widely used shock wave detection method, can be applied to the early stages of implosion diagnosis; however, traditional VISAR can only diagnose point and line targets. In recent years, dual-axis VISAR has achieved shock wave velocity acquisition in the equatorial and polar regions of the target, showing the dynamic development process of driving asymmetry, but limited by the signal acquisition range, it can only obtain the asymmetry difference between the equatorial and polar regions. Wide-angle VISAR has demonstrated significant potential for three-dimensional diagnostics in directly driven targets. However, the current wide-angle VISAR architecture, which uses a streak camera slit to record annular images, hinders the effective utilization of multi-dimensional data and further limits the reconstruction of three-dimensional symmetry information. Furthermore, the weak reflection of the laser beam from the built-in ellipsoid in wide-angle VISAR, coupled with ambient background light, results in poor signal contrast at the imaging location. During shock wave compression, effective signals are lost, leading to diagnostic failure. This poses challenges to diagnosing the shock wave implosion compression process and analyzing implosion symmetry. Therefore, it is necessary to conduct precise diagnostic design for the current wide-angle VISAR optical path system to improve signal acquisition capabilities. This would provide an effective diagnostic tool for studying hydrodynamic instabilities, radiation-driven loading control, and plasma instability, which is crucial for achieving stable ignition in laser fusion. Summary of the Invention

[0003] To address the above technical problems, this invention provides a diagnostic system and method for the compression process of an implosion shock wave that can achieve high-precision diagnosis.

[0004] The technical solution is as follows: The first aspect of the present invention provides a diagnostic system for the compression process of an implosion shock wave, including a driving laser module, a probe laser module, a target module, and a VISAR module. The driving laser module emits a driving laser that can induce an implosion compression in the target module. The key point is that the target in the target module is a single-aperture bracket type target. An ellipsoidal reflector is set inside the single-aperture bracket type target. The laser emitter of the probe laser module is set outside the single-aperture bracket type target, and a beam splitter is set between the two. The probe laser is guided into the interior of the single-aperture bracket type target by the beam splitter and is reflected by the ellipsoidal reflector to illuminate the inner surface of the single-aperture bracket type target. The inner surface of the target is reflected again to obtain reflected light carrying the motion information of the inner surface of the target. The reflected light enters the VISAR module through the first reflector.

[0005] The VISAR module includes an etalon, a streak camera, and at least four second reflectors. An aperture assembly and a cylindrical lens are also added within the module. Reflected light carrying information about the inner surface motion of the target pellet passes through the second reflectors to the etalon, where it is converted into interference fringes. These fringes then pass sequentially through the aperture assembly and cylindrical lens, ultimately forming an image at the streak camera. This structure, combined with a single-aperture support target pellet, aperture assembly, and cylindrical lens, achieves synergistic effects, enabling the recording of a wide range of implosion shock wave compression processes on the inner surface of the target pellet. The single-aperture support target pellet reduces the introduction of asymmetric artificial disturbances and allows for selection of the diagnostic region of interest. The aperture assembly improves fringe quality, and the cylindrical lens expands the acquisition range, offering multiple advantages and enabling high-precision diagnosis of the implosion shock wave compression process of the target pellet.

[0006] Preferably, the single-aperture support target has a hole through which the probe laser can enter the target. Inside the target, a support body is also provided. The support body has a symmetrical support structure, and a mounting hole is provided at the end of the support body away from the hole. The ellipsoidal reflector is mounted on the support body through the mounting hole. With this structure, the hole allows the probe laser to pass through, and the support body supports and fixes the ellipsoidal reflector inside the target, thus reflecting the probe laser.

[0007] Preferably, the focal point of the ellipsoidal reflector coincides with the central region of the inner surface of the single-aperture support target. This structure ensures that the probe laser, after being reflected by the ellipsoidal reflector, can uniformly cover the inner surface of the target.

[0008] Preferably, strip-shaped holes are provided in both the upper and lower symmetrical areas on the side of the support body near the opening, and the opening directions of the upper and lower strip-shaped holes are parallel to the axis of the support body. With this structure, the laser light illuminating the surface of the ellipsoidal reflector can be reflected to the inner surface of the target pellet through the upper and lower strip-shaped holes.

[0009] Preferably, the edges of both the upper and lower strip holes are chamfered. This structure effectively prevents stray light reflection from the edges.

[0010] Preferably, an aperture assembly is provided at the optical path node between the etalon output end of the VISAR module and the incident end of the fringe camera. The aperture assembly has an adjustable aperture, and its center coincides with the central axis of the optical path in the VISAR module. This structure allows for precise control of the spatial range of the static imaging area, shielding stray light reflection from the outer edge of the target pellet, thereby improving the contrast of the interference fringes.

[0011] Preferably, cylindrical lenses with different radii of curvature are added to the optical path between the aperture assembly and the streak camera. Using this structure, the cylindrical lenses can compress the image plane in the vertical direction (i.e., perpendicular to the slit width), thereby expanding the effective acquisition range of the streak camera for the toroidal image and ultimately obtaining target velocity information over a wider spatial area.

[0012] A second aspect of the present invention provides a precise diagnostic method for the compression process of an implosion shock wave, comprising the precise diagnostic system for the compression process of an implosion shock wave provided in the first aspect of the present invention, the steps of which are as follows:

[0013] S1: The drive laser module emits a drive laser to induce an implosion compression in a single-hole support-type target pellet.

[0014] S2: The probe laser module emits a probe laser, which is incident on the interior of the single-aperture bracket target along the central axis through a beam splitter. The laser then illuminates the surface of the ellipsoidal reflector inside the single-aperture bracket target. The ellipsoidal reflector splits the incident laser into two reflected beams, which illuminate the entire inner surface of the target. After illumination, the light is reflected again by the inner surface of the single-aperture bracket target to obtain reflected light carrying information about the movement of the inner surface of the target.

[0015] S3: The reflected light carrying the motion information of the inner surface of the target enters the VISAR module through the first mirror, and after being reflected multiple times by multiple second mirrors, it reaches the etalon, which converts it into interference fringes.

[0016] S4: Then enter the aperture assembly, which eliminates stray light interference with the background of the interference fringes and improves the contrast of the interference fringes;

[0017] S5: Then it enters the cylindrical lens, which expands the effective acquisition range of the toroidal image by the streak camera. Finally, it is recorded by the streak camera to obtain the compression information of the target implosion shock wave.

[0018] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention designs a single-aperture bracket-type target structure and combines it with a "small aperture + cylindrical lens assembly" optical path to form a synergistic effect, thereby realizing the recording of the implosion shock wave compression process over a wide range on the inner surface of the target. Furthermore, the single-aperture bracket-type target reduces the introduction of asymmetric artificial disturbances in the drive, allowing for the design of different apertures and selection of diagnostic regions of interest. The aperture first shields stray light and improves fringe quality, while the cylindrical lens further compresses the image plane and expands the acquisition range. The combination of these two features enables the wide-angle VISAR system to simultaneously possess multiple advantages such as "selectable diagnostic region," "high-contrast fringes," and "wide-range velocity acquisition," effectively improving the diagnostic effect of implosion compression shock waves and enhancing the wide-range shock wave diagnostic application of wide-angle VISAR technology. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system of the present invention;

[0020] Figure 2 This is a diagram illustrating the imaging process of the present invention;

[0021] Figure 3 The image comparison diagram is for aperture assembly 9;

[0022] Figure 4 The image plane of the compressed cylindrical lens 10 is shown in the simulation and experimental comparison diagram. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0024] like Figure 1 As shown, a diagnostic system for the compression process of an implosion shock wave includes a driving laser module, a probe laser module, a target module, and a VISAR module. The driving laser module emits a driving laser that can induce implosion compression in the target module. The target in the target module is a single-aperture bracket-type target 1. An ellipsoidal reflector 2 is installed inside the single-aperture bracket-type target 1. The laser emitter 3 of the probe laser module is located on the outside of the single-aperture bracket-type target 1, and a beam splitter 4 is installed between the two. The probe laser is guided by the beam splitter 4 into the interior of the single-aperture bracket-type target 1 and reflected by the ellipsoidal reflector 2 to illuminate the inner surface of the single-aperture bracket-type target 1. The inner surface of the target 1 reflects light again, carrying the motion information of the inner surface of the target 1. The reflected light enters the VISAR module through the first reflector 5.

[0025] The VISAR module includes an etalon 6, a stripe camera 7, and at least four second reflectors 8. An aperture assembly 9 and a cylindrical lens 10 are also added to the VISAR module. The reflected light carrying the motion information of the inner surface of the target ball passes through the second reflector 8 and reaches the etalon 6, where it is converted into interference fringes. The light then passes through the aperture assembly 9 and the cylindrical lens 10 in sequence, and finally forms an image at the stripe camera.

[0026] The single-aperture support target 1 has a hole through which the probe laser can enter the interior of the single-aperture support target 1. Inside the single-aperture support target 1, a support body 11 is also provided. The support body 11 has a symmetrical support structure, and a mounting hole is provided at the end of the support body 11 away from the hole. The ellipsoidal reflector 2 is mounted on the support body 11 through the mounting hole. The support body 11 is made of lightweight metal or non-metal material (such as gold). The specific material is determined according to the diagnostic target. It can meet the requirements of the support for strength and stability, and has advantages such as good processing performance, low optical interference, corrosion resistance, and good compatibility with the internal components of the target. It can stably support key components in the extreme environment of laser fusion, ensuring the probe laser optical path and diagnostic accuracy.

[0027] The ellipsoidal reflector 2 can be made of aluminum or other metal or non-metal materials. It must also be compatible with the wavelength of the probe laser. The focal point of the ellipsoidal reflector 2 coincides with the central area of ​​the inner surface of the single-aperture support target 1, ensuring that the probe laser can uniformly cover the inner surface of the target after reflection.

[0028] Slotted holes are provided in the upper and lower symmetrical areas near the hole side of the support body 11. The opening directions of the upper and lower slotted holes are parallel to the axis of the support body. The laser reflected by the ellipsoidal reflector 2 is emitted from the upper and lower slotted holes respectively, illuminating the inner surface of the single-hole support target 1. The size, position and central angle of the opening can be adjusted according to the diagnostic needs. The support with the opening is mainly used to select the diagnostic area. As a preferred option, the central angle of the upper slotted hole can be 120° and the central angle of the lower slotted hole can be 60°. The opening edges of the upper and lower slotted holes are chamfered to avoid stray light reflection.

[0029] The reflected light carrying information about the inner surface motion of the target pellet, after being reflected by the single-aperture bracket-type target pellet 1, enters the VISAR module. It is then processed by the etalon 6 and transmitted to the photosensitive surface of the streak camera 7, where it acquires two regularly shaped bright spots. During this process, due to multiple reflections, the signal intensity in the effective signal area is relatively weak.

[0030] The ring edge contains extremely bright background fringes. Stray light reflection is easily generated at the outer edge of the target (such as the diagnostic cone or support structure). This reflected light superimposes with the Doppler signal light on the inner surface of the target (target monitoring area), resulting in excessively bright background interference fringes captured by the fringe camera 7, thus reducing the discernibility of the effective signal. In other words, when the intensity of the background stray light approaches the intensity of the target signal light, the alternating bright and dark characteristics of the fringes are weakened, making it difficult to accurately extract velocity information through subsequent algorithms.

[0031] Therefore, an aperture assembly 9 is provided at the optical path node between the output end of the etalon 6 of the VISAR module and the input end of the streak camera 7. The aperture assembly 9 has a small hole with an adjustable aperture size, and the center of the aperture assembly 9 coincides with the central axis of the optical path in the VISAR module. This ensures that the target beam after interference processing must first pass through the aperture assembly 9 with the small hole before entering the slit acquisition area of ​​the streak camera 7. The aperture assembly 9 can be made of metal or non-metal materials (such as black plastic) and is a circular small-hole aperture. The aperture size can be adjusted according to the size of the wide-angle VISAR image plane. Through the spatial filtering effect of the small hole, only the effective signal light of the target monitoring area of ​​the built-in ellipsoidal reflector 2 is allowed to pass through, while the stray light at the edge is blocked by the light-shielding area of ​​the aperture because the propagation path deviates from the center of the optical path. This eliminates the background interference of stray light on the interference fringes and improves the contrast of the effective signal fringes.

[0032] The wide-angle VISAR module needs to acquire and record the Doppler frequency shift signal (corresponding to velocity information) through the stripe camera 7. However, the existing module uses a slit-type aperture assembly 9 for image plane acquisition, which means that the returned target toroidal reflection image can only acquire information of a local area through the slit, and cannot cover the entire toroidal surface, thus limiting the acquisition range of velocity information.

[0033] Therefore, cylindrical lenses 10 with different radii of curvature are added in the optical path between the aperture assembly 9 and the streak camera 7. The cylindrical lenses 10 compress the image plane in the vertical direction of the imaging beam (i.e., perpendicular to the slit width), thereby expanding the effective acquisition range of the streak camera 7 for the toroidal image and finally obtaining the target velocity information in a wider spatial area.

[0034] The radius of curvature of the cylindrical lens 10 needs to be designed based on the spatial resolution requirements of the image plane features returned by the wide-angle VISAR module, the effective acquisition of the streak camera 7 (such as slit width and sensor size), and the target velocity information. By adjusting the curvature parameters of the cylindrical lens 10, the toroidal image returned by the wide-angle VISAR can be adjusted to a shape that matches the acquisition surface of the streak camera 7 (such as a narrow-band stripe image), reducing the matching deviation between the image plane and the acquisition window of the streak camera, and improving the integrity and convenience of signal recording.

[0035] The imaging process of the diagnostic system of the present invention is as follows: Figure 2 As shown, Ⅰ represents the front image of the aperture assembly 9, Ⅱ represents the rear image of the aperture assembly 9, Ⅲ represents the image formed by compression of the cylindrical lens 10, and Ⅳ represents the final image acquired by the strip camera 7. The diagnostic method process of this invention is as follows:

[0036] The driving laser module emits a driving laser to induce an implosion compression in a single-hole bracket-type target pellet 1.

[0037] The probe laser module emits a probe laser, which is incident on the interior of the single-aperture bracket target 1 along the central axis through the beam splitter 3. The laser then illuminates the surface of the ellipsoidal reflector 2 inside the single-aperture bracket target 1. The ellipsoidal reflector 2 splits the incident laser into two reflected beams, which illuminate the entire inner surface of the target. After illumination, the laser beam is reflected again by the inner surface of the single-aperture bracket target 1 to obtain reflected light carrying the motion information of the inner surface of the target.

[0038] The laser beam reflected by the upper half of the ellipsoidal reflector 2 is emitted through the 120° opening in the upper section of the support body 11, illuminating the upper half of the spherical surface inside the target pellet; the laser beam reflected by the lower half of the ellipsoidal reflector 2 is emitted through the 60° opening in the lower section of the support, illuminating the lower half of the spherical surface inside the target pellet.

[0039] The reflected light carrying information about the inner surface motion of the target pellet enters the VISAR module through the first reflector 5. After being reflected multiple times by multiple second reflectors 8, it reaches the etalon 6, where it is converted into interference fringes. The light then enters the aperture assembly 9. Through the spatial filtering effect of the small aperture in the aperture assembly 9, only the effective signal light reflected from the built-in ellipsoid in the target monitoring area is allowed to pass through, eliminating stray light background interference on the interference fringes and improving the contrast of the interference fringes. The light then enters the cylindrical lens 10, which expands the effective acquisition range of the fringe camera for the toroidal image. Finally, the fringe camera records the compressed information of the target pellet's implosion shock wave.

[0040] This system features a single-aperture bracket-type target pellet 1, and an optical path consisting of a small aperture assembly 9 and a cylindrical lens 10, working synergistically. The single-aperture bracket-type target pellet 1 reduces the introduction of artificial disturbances due to asymmetric drive, allowing for the design of different apertures and selection of the diagnostic region of interest. The aperture assembly 9 first shields stray light and improves fringe quality, while the cylindrical lens 10 further compresses the image plane and expands the acquisition range. The combination of these two elements enables the wide-angle VISAR module to simultaneously possess the multiple advantages of "selectable diagnostic region," "high-contrast fringes," and "wide-range high-speed acquisition."

[0041] It should be noted that since the Doppler frequency shift information on the inner surface of the target pellet is compressed to the same spatial position on the photosensitive surface of the fringe camera 7, the velocity data obtained by the fringe analysis algorithm (such as the Fourier transform method) is essentially the average velocity value within this compressed region. To address this characteristic, the aperture structure of the front aperture assembly 9 can be modified. Specifically, the aperture area can be reduced (e.g., the aperture diameter can be reduced from 2 mm to 0.5 mm) and a non-circular aperture (e.g., a fan-shaped aperture) can be designed. This allows the cylindrical lens 10 to compress only the image plane of a small local area of ​​the target pellet, thereby achieving refined acquisition of velocity information in the target area and improving the velocity measurement resolution of the system.

[0042] Test Example 1

[0043] A comparative experiment was set up, and the imaging results of the component with pinhole aperture 9 and the component without pinhole aperture 9 were observed under the same experimental conditions (same target, same laser energy, same acquisition parameters).

[0044] like Figure 3 As shown, the effectiveness of this solution is verified as follows:

[0045] Light intensity distribution: group without aperture ( Figure 3 The light intensity distribution in (a) shows that the light intensity peak in the effective signal area is significantly weaker than that in the stray light area at the outer edge, exhibiting an abnormal distribution of "bright at the edge and dark in the center"; while the light intensity peak of the group with aperture (Fig. 3(b)) is concentrated in the effective signal area, and there is almost no beam in the stray light area at the outer edge.

[0046] Stripe contrast quantization improvement: By calculating the "relative brightness contrast" of the effective signal area in the dynamic interferogram (defined as: (bright stripe gray value - dark stripe gray value) / bright stripe gray value), the relative brightness contrast of the test without aperture is about 0.34, while the relative brightness contrast of the test with aperture is improved to 0.64, with a contrast increase of 88%, which meets the requirements of the subsequent speed analysis algorithm.

[0047] Test Example 2

[0048] like Figure 4 As shown, the image plane of the target ring after being filtered by the pre-aperture assembly 9 is compressed in the vertical direction using the cylindrical lens 10 designed above. Simulation results show that:

[0049] The scattered beams on the original toroidal structure image plane can be effectively converged and compressed into the central axis region of the system by the cylindrical lens 10 along the vertical direction, forming a continuous narrow band image spot; this compression effect enables the slit of the streak camera 7 to completely cover all the effective signal areas of the original toroidal surface, and the acquisition efficiency is improved by ≥60% compared with the scheme without cylindrical lenses;

[0050] The simulation results above show good consistency with the actual test results under the same experimental conditions, verifying the effectiveness of this scheme.

[0051] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A precision diagnostic system for the compression process of an implosion shock wave, comprising a driving laser module, a probe laser module, a target module, and a VISAR module, wherein the driving laser module emits a driving laser capable of inducing implosion compression in the target module, characterized in that: The target in the target module is a single-hole bracket type target (1). An ellipsoidal reflector (2) is set inside the single-hole bracket type target (1). The laser emitter (3) of the probe laser module is set outside the single-hole bracket type target (1), and a beam splitter (4) is set between the two. The probe laser is guided by the beam splitter (4) into the interior of the single-hole bracket type target (1), and is reflected by the ellipsoidal reflector (2) to illuminate the inner surface of the single-hole bracket type target (1). The inner surface of the target is reflected again to obtain the reflected light carrying the motion information of the inner surface of the target. The reflected light enters the VISAR module through the first reflector (5). The VISAR module includes an etalon (6), a stripe camera (7), and at least four second reflectors (8). An aperture assembly (9) and a cylindrical lens (10) are also added to the VISAR module. The reflected light carrying the motion information of the inner surface of the target ball passes through the second reflector (8) to the etalon (6) and is converted into interference fringes. Then, it passes through the aperture assembly (9) and the cylindrical lens (10) in sequence and is finally imaged at the stripe camera.

2. The precision diagnostic system for the compression process of an implosion shock wave according to claim 1, characterized in that: The single-hole support target (1) has a hole, through which the probe laser can enter the interior of the single-hole support target. Inside the single-hole support target (1), there is also a support body (11). The support body (11) has a symmetrical support structure, and an installation hole is provided at one end of the support body (11) away from the hole. The ellipsoidal reflector (2) is installed on the support body (11) through the installation hole.

3. The precision diagnostic system for the compression process of an implosion shock wave according to claim 2, characterized in that: The focal point of the ellipsoidal reflector (2) coincides with the central region of the inner surface of the single-aperture bracket target (1).

4. The precision diagnostic system for the compression process of an implosion shock wave according to claim 2, characterized in that: Slotted holes are provided in the upper and lower symmetrical areas of the support body (11) near the hole, and the opening directions of the upper and lower slotted holes are parallel to the axis of the support body.

5. A precision diagnostic system for the compression process of an implosion shock wave according to claim 4, characterized in that: The edges of both the upper and lower strip holes are chamfered.

6. A precision diagnostic system for the compression process of an implosion shock wave according to claim 1, characterized in that: An aperture assembly (9) is provided at the optical path node between the output end of the standard etalon (6) of the VISAR module and the incident end of the stripe camera (7). The aperture assembly (9) has a small hole that can adjust the aperture size, and the center of the aperture assembly (9) coincides with the central axis of the optical path in the VISAR module.

7. A precision diagnostic system for the compression process of an implosion shock wave according to claim 6, characterized in that: A cylindrical lens (10) with a different radius of curvature is added in the optical path between the aperture assembly (9) and the stripe camera (7).

8. A precise diagnostic method for the compression process of an implosion shock wave, characterized in that: A precision diagnostic system for the compression process of an implosion shock wave, as described in any one of claims 1-7, comprises the following steps: S1: The driving laser module emits a driving laser to induce the implosion compression of a single-hole bracket-type target pellet (1). S2: The probe laser module emits a probe laser, which is incident on the interior of the single-aperture bracket target (1) along the central axis through the beam splitter (3) and irradiates the surface of the ellipsoidal reflector (2) built into the single-aperture bracket target (1). The ellipsoidal reflector (2) splits the incident laser into two reflected beams, which illuminate the entire inner surface of the target. After illumination, the light is reflected again by the inner surface of the single-aperture bracket target (1) to obtain the reflected light carrying the motion information of the inner surface of the target. S3: The reflected light carrying the motion information of the inner surface of the target ball enters the VISAR module through the first reflector (5), and after being reflected multiple times by multiple second reflectors (8), it reaches the etalon (6), and is converted into interference fringes by the etalon (6). S4: Then enter the aperture assembly (9), and eliminate the background interference of stray light on the interference fringes through the aperture assembly (9) to improve the contrast of the interference fringes; S5: Then it enters the cylindrical lens (10), and the effective acquisition range of the toroidal image by the stripe camera is expanded by the cylindrical lens (10). Finally, it is recorded by the stripe camera to obtain the compression information of the target implosion shock wave.

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