Three-dimensional reconstruction of integrated implosion targets from simulated small-angle pinhole images

TL;DR

This paper presents a novel integral method for three-dimensional reconstruction of plasma core radiation in inertial confinement fusion using limited pinhole images, demonstrating high accuracy in simulations.

Contribution

The study introduces a new reconstruction technique that effectively estimates 3D radiation distribution from minimal imaging data in fusion experiments.

Findings

Normalized mean square deviation of 0.4401 in simulations

Structural similarity of 0.5566 achieved

More diagnostic holes improve accuracy

Abstract

To indirectly evaluate the asymmetry of the radiation drive under limited measurement conditions in inertial confinement fusion research, we have proposed an integral method to approximate the three-dimensional self-radiation distribution of the compressed plasma core using only four pinhole images from a single laser entrance hole at a maximum projection angle of 10{\deg}. The simultaneous algebraic reconstruction technique (SART) that uses spatial constraints provided by the prior structural information and the central pinhole image is utilized in the simulation. The simulation results showed that the normalized mean square deviation between the original distribution and reconstruction results of the central radiation area of the simulated cavity was 0.4401, and the structural similarity of the cavity radiation distribution was 0.5566. Meanwhile, using more diagnostic holes could achieve better structural similarity and lower reconstruction error. In addition, the results indicated that our new proposed method could reconstruct the distribution of a compressed plasma core in a vacuum hohlraum with high accuracy.