Fabrication and half-life time of gas-filled plastic hohlraum

This paper focuses on the fabrication and half-life time of the gas-illed polystyrene hohlraum. There are two ways to fabricate the polystyrene hohlraum, i.e. spin coating with polystyrene solution and dip coating with molten polystyrene. Experiments show that many bubbles and orientation crystallization exist in the plastic hohlraum made by polystyrene melt, and the hohlraum can hardly retain gas due to too many cracks in it after the removal of copper mandrels. Plastic hohlraums made by spin coating, 10 to 30 μm in thickness and 5 to 20 nm in surface finish, are sealed with 0.3~0.4 μm thick polyimide films. The halflife time of these hohlraums filled with kropton gas is more than 24 h measured by X-ray fluorescence spectrometry．Holded in a gas container, the gas can keep about 92% o