Liquid argon purification and purity monitoring system at Wellesley College

We report results from a lab-scale liquid argon purification facility at Wellesley College. The system includes a single-pass liquid argon purifier, a double-gridded purity monitor to assess the electron lifetime. The facility supports ongoing detector R&D on charge and light readout technologies for future large-scale liquid argon time projection chambers (LArTPCs) such as Q-Pix and other cold electronics systems. We will present on the design of the test stand, along with initial performance results (measured O2-equivalent impurity level of 0.4 ppb, corresponding to an electron lifetime of 800 us at a 500 V/cm drift field). We also report on the status of the development of a larger-scale system with 250L capacity.