Speaker
Description
Liquid argon (LAr) is at the core of Time Projection Chamber (TPC) used in neutrino experiments. Nitrogen, oxygen, and water are the main contaminants in LAr that compromise the quality of physics a LArTPC can deliver. It is crucial to keep them as low as possible. In particular nitrogen is known to absorb the LAr scintillation light, one of the 2 key observables in LArTPCs. This poster outlines an experiment performed in the ICEBERG test stand at the Noble Liquid Test Facility (NLTF, Fermilab) to capture nitrogen from LAr using Li-FAU, an innovative method developed and previously tested in the Liquid Argon Purification Cryostat (PuLArC) at IFGW/Unicamp. Confirming the results obtained in PuLArC, this test shows that Li-FAU filtered the nitrogen injected multiple times into 2,625 L of LAr down to $<$1 ppm concentration over cycles of 96 h.