Gas pressure measurement in ICF cryogenic target micro-tube gas-filling process

A self-designed micro-tube gas-filling system was used to fill cryogenic targets with deuterium gas in normal temperature. The relationships between difference of gas pressure at the two ends of gas-filling tube and tube length, gas-filling rate and gas-filling time were studied. The results show that the gas-pressure difference first increases and ultimately decreases tozero, The time required for gas pressure equilibrium tends to be shorter when gas filling tube length decreases and gas-filling rate increases. The experimental results are in good agreement with the prediction on the basis of the Hagen-Poiseuille equation.