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arXiv · 2604.21307

Liquid argon purification and purity monitoring: apparatus and first results

Wenzhao Wei·I-see Warisa Jaidee·Spencer Dockal·Vyara Tsvetkova·Genevieve Bui·Tenaya Chen Lin·Lucia Epstein·Ava Faubus·Neneh M. T. Hambraeus·Sunshine B. Lyon·Diana Lopez·Natalie McGee·Piper J. Migden·Cleo Nicollin·Meenakshi Unnithan·Jonathan Asaadi·James B. R. Battat
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Abstract

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.

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Wenzhao Wei, I-see Warisa Jaidee, Spencer Dockal, Vyara Tsvetkova, Genevieve Bui, Tenaya Chen Lin, Lucia Epstein, Ava Faubus, Neneh M. T. Hambraeus, Sunshine B. Lyon, Diana Lopez, Natalie McGee, Piper J. Migden, Cleo Nicollin, Meenakshi Unnithan, Jonathan Asaadi, James B. R. Battat. 2026-08-21. Liquid argon purification and purity monitoring: apparatus and first results. https://arxiv.org/abs/2604.21307

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