Abstract

Copper-doped beryllium spheres are an attractive ablator for inertial confinement fusion experiments. Beryllium spheres are made by sputtering beryllium onto spherical plastic mandrels which must then be removed through a hole that is laser drilled through the shell wall. The currently used mandrel material is glow discharge polymer. This material cannot be removed by solvent and must be “burned” out. The burnout process was originally performed by etching with dry air at 425°C, but this process can substantially roughen the inner surface, which can seed instabilities and increase mix during implosion experiments. In this paper, we explore the use of pure oxygen and ozone to reduce process temperature and improve inner and outer surface quality.

摘要

铜掺杂铍球是惯性约束聚变实验的一种有吸引力的烧蚀剂。铍球是通过将铍溅射到球形塑料心轴上制成的，然后必须通过一个穿过外壳壁的激光钻孔将其除去。当前使用的心轴材料是辉光放电聚合物。该物质不能用溶剂除去，必须“烧掉”。烧尽过程最初是通过在425°C的干燥空气中进行蚀刻来执行的，但此过程可能会使内表面显着粗糙，这可能导致不稳定性增加并在内爆实验中增加混合。在本文中，我们探索使用纯氧和臭氧来降低工艺温度并改善内外表面质量。