In order to achieve the ignition by direct-drive inertial confinement fusion (ICF), smooth and symmetric fuel capsule is required. Our previous research found that stiffness of the capsule material contributes to reduce the laser imprinting. Therefore, diamond is considered to be the most promising candidate as the stiff ablator material for direct-drive ICF capsule. In this study, aiming at improving the surface roughness on the diamond capsule, we obtained dependence of methane concentration and gas pressure on surface roughness and morphology by hot filament chemical vapor deposition technique.

中文翻译：

---

直接驱动惯性约束聚变的金刚石囊生长条件与形貌和表面粗糙度的关系

为了通过直接驱动惯性约束聚变（ICF）实现点火，需要光滑且对称的燃料盒。我们先前的研究发现，胶囊材料的硬度有助于减少激光压印。因此，金刚石被认为是用于直接驱动ICF胶囊的坚硬消融材料的最有希望的候选者。在这项研究中，针对改善金刚石囊的表面粗糙度，我们通过热丝化学气相沉积技术获得了甲烷浓度和气压对表面粗糙度和形貌的依赖性。