Liquid argon purification and purity monitoring: apparatus and first results
We report results from a 13-liter purified liquid argon test stand at Wellesley College in Massachusetts, USA. The system includes a single-pass liquid-phase purification column that can achieve sub-part-per-billion impurity levels. The liquid argon purity is measured with a double-gridded purity monitor to assess the electron lifetime. Measurements demonstrate an O2-equivalent impurity concentration of $0.21 \pm 0.05$ ppb (stable over a 20-hour duration), corresponding to an electron lifetime of 1.6 ms at a drift field of 500 V/cm. This test stand supports ongoing detector R\&D on charge and light readout for liquid argon time projection chambers, such as Q-Pix and other cold electronics systems.
physics.ins-det↗