Online auxiliary aiming device for X-ray streak camera

Abstract

The invention provides an online auxiliary aiming device for an X-ray streak camera. The online auxiliary aiming device comprises a reading camera, an optical coupling lens, a lens connecting piece, an inclination angle adjusting platform, a vacuum window flange, a reflector and a scintillator assembly. The optical coupling lens is respectively connected with the reading camera and the lens connecting piece; the lens connecting piece is arranged on the inclination angle adjusting platform; the inclination angle adjusting platform is arranged on the vacuum window flange, and the view field of the camera is read by adjusting the angle; the vacuum window flange is used for isolating atmosphere from a vacuum environment; the reflecting mirror is arranged in a vacuum environment in the vacuum window flange; the scintillator assembly is arranged at a preset cathode slit of the streak camera. Reference can be provided for adjustment, aiming precision is improved, aiming time is shortened, and experiment efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of streak cameras, and in particular to an online auxiliary aiming device for an X-ray streak camera. Background Art

[0002] An X-ray streak camera is a scientific optoelectronic measurement instrument with high temporal and spatial resolution. It is used for ultrafast X-ray radiation detection and imaging to obtain the time, space and other intensity information of the measurement target. It can also be used in conjunction with other equipment, such as spectrometers, pinhole aperture systems, etc., to obtain information such as electron temperature, density, spectral time evolution and plasma velocity, providing effective data for the research and analysis of strong field physical processes. It is a core diagnostic instrument in experimental research such as laser fusion, high energy density physics, Z pinch and laboratory astrophysics.

[0003] X-ray streak cameras are mostly open systems, which are generally directly vacuum-connected to the front-end system or target ball through a vacuum sealing flange. The X-rays generated by target shooting are transmitted in the vacuum cavity through optical elements such as pinhole apertures placed in the cone, irradiated on the cathode slit of the streak camera, and detected and recorded. When conducting laser fusion physics experiments, if the hard X-rays (through light) generated by target shooting that have not been imaged by optical elements vertically irradiate the cathode of the X-ray streak camera, or some X-rays that are not absorbed by the cathode will pass through the anode hole of the streak tube and bombard the rear fluorescent screen to form a fluorescent image (through light image), which is superimposed on the scanned streak image to form background noise. When the through light is very strong, the effective signal is easily submerged and the signal-to-noise ratio deteriorates. To avoid this situation, an inclined flange is usually installed at the front end of the X-ray streak camera, and the camera is deflected at a certain angle relative to the cavity axis, so that the X-rays are tilted to enter the streak camera at a small angle, and the through light deviates from the anode hole of the streak tube to avoid the through light from imaging on the fluorescent screen. At this time, the axis formed by the cone-diagnostic pipeline cavity-streak camera tube center line is a broken line. During the experiment, the target, the front pinhole aperture, and the streak camera cathode slit need to be adjusted to the same straight line (aiming). The following parameters can reflect the difficulty of aiming: the target diameter is about 100μm, the cone aperture is 0.2m-0.5m away from the target, and the aperture is 10μm-30μm; the streak camera is about 2.5m-4.0m away from the target ball, and the streak camera slit width is about 100μm; the device is in a vacuum when working, such as Figure 1 shown.

[0004] The difficulty of aiming the target, the front pinhole aperture, and the streak camera cathode slit in a straight line lies in the following: (1) The target and cathode slits are small, about 100μm, but the distance between them is very long, about 2.5m to 4.0m, with a very small aperture of 10μm-30μm in the middle; (2) In order to avoid direct light penetration, the axis of the cavity pipeline is designed as a broken line in most cases; (3) Optical aiming is usually completed in the atmosphere, and the target chamber and cavity pipeline need to be evacuated to a vacuum state during operation. During the evacuation process, the target chamber and cavity will produce irregular deformation and displacement due to the change of internal and external air pressure, resulting in the target, front aperture, and streak camera cathode slit, which were originally in a straight line in the atmosphere, being misaligned in the vacuum. Experiments have shown that this deviation is in the millimeter level at the cathode position, and can even reach more than 10mm. The specific deviation is complexly related to the target chamber structure and the cavity on which the streak camera is mounted. Misalignment and deviation in the vacuum state must be corrected to meet the requirements of target acquisition; (4) The position of the target (or the geometric position of the X-ray luminous point) will vary by 10 μm due to changes in the target of each batch of target experiment.

[0005] In the process of physical experiments, it takes a lot of energy, time, and times to adjust the position of the front aperture and the streak camera slit so that the X-rays emitted by the target can be detected by the streak camera through the aperture pinhole. The experimental cost and time are high. Even wasting a lot of times may not necessarily achieve a good aiming state, affecting the progress of experimental data acquisition. Therefore, it is urgent to develop a vacuum online aiming and monitoring system to provide a reference for adjustment, improve aiming accuracy, shorten aiming time, and improve experimental efficiency. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an online auxiliary aiming device for an X-ray streak camera, which can improve aiming accuracy, shorten aiming time, and improve experimental efficiency.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] An online auxiliary aiming device for an X-ray streak camera, comprising: a readout camera, an optical coupling lens, a lens connector, a tilt angle adjustment platform, a vacuum window flange, a reflector and a scintillator assembly;

[0009] The optical coupling lens is connected to the readout camera and the lens connector respectively; the lens connector is arranged on the tilt angle adjustment platform; the tilt angle adjustment platform is arranged on the vacuum window flange; the tilt angle adjustment platform and the lens connector are also arranged on a preset vacuum window flange, and the vacuum window flange is used to isolate the atmosphere from the vacuum environment, and adjust the field of view of the readout camera by adjusting the angle of the tilt angle adjustment platform; the reflector is arranged in the vacuum environment in the vacuum window flange; the scintillator assembly is arranged at the cathode slit of the preset streak camera.

[0010] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0011] The present invention provides an online auxiliary aiming device for an X-ray streak camera, comprising: a readout camera, an optical coupling lens, a lens connector, a tilt angle adjustment platform, a vacuum window flange, a reflector and a scintillator assembly; the optical coupling lens is connected to the readout camera and the lens connector respectively; the lens connector is arranged on the tilt angle adjustment platform; the tilt angle adjustment platform is arranged on the vacuum window flange; the tilt angle adjustment platform and the lens connector are also arranged on a preset vacuum window flange, the vacuum window flange is used to isolate the atmosphere from the vacuum environment, and adjust the field of view of the readout camera by adjusting the angle of the tilt angle adjustment platform; the reflector is arranged in the vacuum environment in the vacuum window flange; the scintillator assembly is arranged at the cathode slit of the preset streak camera. The present invention can provide a reference for adjustment, improve aiming accuracy, shorten aiming time, and improve experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 Schematic diagram of the optical path of the target sphere, aperture, and streak camera slit system provided by the prior art;

[0014] Figure 2 A schematic diagram of the structure of a device provided in an embodiment of the present invention;

[0015] Figure 3 A schematic diagram of the three-dimensional structure of a device provided in an embodiment of the present invention;

[0016] Figure 4 A simplified diagram of the structure of a device provided in an embodiment of the present invention;

[0017] Figure 5 An image of the cathode surface of an X-ray streak camera observed by the monitoring system provided in an embodiment of the present invention;

[0018] Figure 6 The image is collected by the endoscope system before the correction aiming provided by the embodiment of the present invention;

[0019] Figure 7 The image collected by the endoscope system after the correction aiming provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The purpose of the present invention is to provide an online auxiliary aiming device for an X-ray streak camera, which can provide a reference for adjustment, improve aiming accuracy, shorten aiming time, and improve experimental efficiency.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 2 A schematic diagram of the structure of the device provided in the embodiment of the present invention is shown in FIG. Figure 2 As shown, the present invention provides an online auxiliary aiming device for an X-ray streak camera, comprising: a readout camera, an optical coupling lens, a lens connector, a tilt angle adjustment platform, a vacuum window flange, a reflector and a scintillator assembly; the optical coupling lens is connected to the readout camera and the lens connector respectively; the lens connector is arranged on the tilt angle adjustment platform; the tilt angle adjustment platform is arranged on the vacuum window flange; the tilt angle adjustment platform and the lens connector are also arranged on a preset vacuum window flange, the vacuum window flange is used to isolate the atmosphere from the vacuum environment, and adjust the field of view of the readout camera by adjusting the angle of the tilt angle adjustment platform; the reflector is arranged in the vacuum environment in the vacuum window flange; the scintillator assembly is arranged at the cathode slit of the preset streak camera.

[0024] This embodiment discloses a monitoring device that can be used for online aiming of a target, a front aperture, and a streak camera slit in a vacuum environment. Figures 2 to 4As shown, it consists of a readout camera, an optical coupling lens, a lens connector, a vacuum window flange, a tilt angle adjustment platform, a reflector and a scintillator assembly. The scintillator is installed near the cathode slit of the streak camera and can generate visible light during the target shooting process. The angle of the reflector and its position in the vacuum flange need to be determined by designing the optical path. The tilt angle adjustment platform and the lens connector are installed on the vacuum window flange. This part can not only isolate the atmosphere from the vacuum environment, but also adjust the angle of the tilt angle adjustment platform to adjust the field of view of the readout camera. The readout camera and the optical coupling lens are installed on the tilt angle adjustment platform through the lens connector to realize real-time signal reading. When the ultraviolet simulated light source of the target point or the X-rays generated by the target shooting enter the X-ray streak camera through the front pinhole aperture and irradiate the scintillator at the front end of the cathode, the scintillator emits visible light and enters the readout camera through the reflector. If it is found after target shooting that the streak camera has not collected any physical signal or has collected an abnormal physical signal, the image collected by the readout camera can be analyzed. If there is a positional difference between the visible light generated by the scintillator and the cathode slit, it can be determined that the X-rays entering the streak camera through the aperture do not coincide with the cathode slit. The pixel size and resolution of the readout camera are known, and the distance between the two can be obtained by a simple calculation using image analysis software, providing qualitative and quantitative data for the aperture pointing adjustment, thereby achieving the purpose of auxiliary aiming.

[0025] In addition to assisting aiming, this device can also collect optical images near the cathode plate of the streak camera, and observe the alignment between the time-scale light output end and the slit of the X-ray streak camera in the field of view.

[0026] Figure 5 To verify that the cathode monitoring system of the present invention is installed on an X-ray streak camera: a simulated test of the designed cathode monitoring system was carried out in the laboratory, and a grid paper was placed at a distance of 140mm from the mounting flange. The experimental results show that the monitoring field of the system is about 50mm*40mm. It is installed on the X-ray streak camera, and images are collected to verify that it can observe the entire cathode sheet.

[0027] Figure 6 and Figure 7 The image collected during the target shooting process is the application of the X-ray streak camera matched with this device in the experiment of upgrading the Shenguang II: Figure 6 is the image collected before correcting the aiming. Figure 7 This is the image collected after correcting the aiming. It can be seen that the device can clearly collect the positional relationship between the visible light emitted by the scintillator and the slit when the X-ray is irradiated to the target, and can provide quantitative reference data for correcting the pointing and aiming of the aperture cone, and has a significant auxiliary aiming function.

[0028] The present invention designs a simple imaging device that can monitor the state of the cathode input surface of an X-ray streak camera in real time under a vacuum environment. The device is composed of a readout camera, an optical coupling lens, a tilt angle adjustment platform, a reflector, a vacuum sealing mounting flange, and a scintillator. The scintillator is closely mounted on the cathode input surface of the X-ray streak camera. When the soft X-rays generated by strong laser target shooting pass through the front pinhole aperture system and shine on the scintillator in front of the X-ray cathode, the scintillator emits light to form a visible light image. The image is reflected by the reflector and reaches the readout camera and is recorded and saved. According to the image data, the quantitative deviation between the position of the X-ray irradiation and the streak camera slit can be directly visually judged. After conversion, the adjustment direction and adjustment amount of the cone pinhole aperture can be determined, providing a quantitative reference for the aiming between the target ball, the cone pinhole aperture and the X-ray streak camera slit.

[0029] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0030] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An online auxiliary aiming device for an X-ray streak camera, characterized in that: include: Readout camera, optical coupling lens, lens connector, tilt angle adjustment platform, vacuum window flange, reflector and scintillator assembly; The optical coupling lens is connected to the readout camera and the lens connector respectively; the lens connector is arranged on the tilt angle adjustment platform; the tilt angle adjustment platform is arranged on the vacuum window flange; the tilt angle adjustment platform and the lens connector are also arranged on a preset vacuum window flange, and the vacuum window flange is used to isolate the atmosphere from the vacuum environment, and adjust the field of view of the readout camera by adjusting the angle of the tilt angle adjustment platform; the reflector is arranged in the vacuum environment in the vacuum window flange; the scintillator assembly is arranged at the cathode slit of the preset streak camera.

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