ICF hot spot three-dimensional coding imaging method based on Bragg Fresnel zone plate

Abstract

The invention discloses an ICF hot spot three-dimensional coding imaging method based on a Bragg Fresnel zone plate. The ICF hot spot three-dimensional coding imaging method comprises the following steps that S1, X rays are emitted to the Bragg Fresnel zone plate from multiple spatial positions of a hot spot; s2, the X rays reflected by the Bragg Fresnel zone plate are incident to an imaging recording surface; and S3, the coded image is inverted, and the three-dimensional space distribution of the light-emitting target is reconstructed in the hot spot area. By the adoption of the technical method, the Bragg Fresnel zone plate combines the characteristics of a multi-layer film and the zone plate, the Bragg Fresnel zone plate is suitable for medium and high energy X rays, the background interference problem of direct penetrating X rays is avoided through reflection type imaging, the working mode of the Bragg non-Fresnel zone plate is an off-axis mode, so reflection-type coding imaging is carried out by only using a half-wave zone plate, so that non-focusing artifact interference caused by multiple focuses is greatly inhibited, the coding imaging quality is greatly improved, and a reliable foundation is laid for the coding image reconstruction precision.

Description

technical field [0001] The invention relates to the technical field of zone plate encoding imaging, in particular to a three-dimensional encoding imaging method for ICF hot spots based on a Bragg Fresnel zone plate. Background technique [0002] In the study of laser inertial confinement fusion (ICF), the X-ray spontaneous emission of hot spots has a complex spatial distribution. The three-dimensional structure of hot spots is crucial for a deep understanding of ignition physics and for checking computational simulation programs. In order to measure the three-dimensional distribution of the self-emission intensity of the hot spot, people use a method similar to CT imaging to image the hot spot from multiple angles, and then use the CT reconstruction algorithm to obtain the three-dimensional distribution of the hot spot. However, due to the limitation of the experimental environment, the multi-angle measurement of hot spot self-emission generally only meets the measurement o...

AI Technical Summary

Problems solved by technology

In order to adapt to the coding imaging of medium and high-energy X-rays (4-10keV), the thickness of the zone plate needs to be increased, resulting in an increase in the aspect ratio, which will greatly increase the difficulty and cost of the zone plate, and even for some specific There is a problem that the energy X-ray cannot be developed

Therefore, the traditional Fresnel zone plate encoding imaging has encountered huge obstacles when expanding to medium and high energy X-rays, while hot spot X-ray self-emission is mainly aimed at imaging medium and high energy X-rays, so the traditional Fresnel wave Slice coding imaging technique is not suitable for 3D imaging of hot spot self-emission

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