Analysis of growing characteristics of fuel layer in ICF cryogenic target. (June 2022)

• Record Type: Journal Article
• Authors: Guo, Fucheng; Li, Cui; Li, Yanzhong
• Is Part Of: Cryogenics. Volume 124(2022)
• Publication Date: 2022-06
• Subjects: Cryogenic target -- Sublimation and desublimation -- Fuel layer -- Numerical simulation; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2022.103480
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: The growth of fuel layer is numerically studied. The low mode amplitudes increase dramatically during the layer growth process. The increasing temperature difference has damaging effect on the layer uniformity. Lager fuel mass inside the capsule helps to improve the layer uniformity. The T content of fuel is positively correlated with the layer uniformity. Abstract: A cryogenic capsule is the key component of the inertial confinement fusion device and has gained increasing attention in the world. The solid hydrogen-isotope fuel inside the capsule is required to have a uniformity greater than 99% for a successful ignition. This study is concerned with the growing characteristics of the fuel layer. A numerical model has been established, and the predicted results are in good agreement with the experimental data. The investigation results indicate that during the growing process, the DT ice layer gets thicker with a decreasing growth speed, and this is accompanied by a dramatical increase in the amplitudes of low modes, especially for mode 1. The uniformity of the fuel layer can be improved by the means of reducing the maximum temperature difference along the capsule, increasing the mass of the fusion fuel inside the capsule, and using the higher-tritium fusion fuel. For the content of tritium of the fuel, the modes amplitudes of the fuel layer decrease with the contents of tritium, and no obvious change is observed when the volume fraction of tritium becomes greater than 50%.