Cryogenic Permeability of Polyimide Shells
نویسندگان
چکیده
Polyimide shells are used as targets in Inertial Confinement Fusion (ICF) experiments. These shells are filled with DT gas, then cooled to low temperatures for cryogenic laser shots. During target preparation, shells require careful pressure and temperature control due to their sensitivity. The pressure is governed partly by permeation through the shell wall, which can only be determined with the knowledge of the shell permeability over a wide temperature range. A new method was developed to test the permeability of shells at temperatures ranging from 123K to 23 K. This method produced results at room temperature comparable to those using current setups. Arrhenius' relationship was observed from room temperature to 120K and the activation energy for permeation was determined for shells prepared under different processing conditions. The results will allow the permeability of shells to be predicted for various temperatures.
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