The XENONnT Liquid Purification System and Its Test System

The XENONnT experiment, currently under construction at the Laboratori Nazionali del Gran Sasso in Italy, aims at detecting dark matter weakly interacting massive particles using a dual-phase (liquid/gas) xenon time projection chamber with 1.5m drift length which is filled with about 8400kg of liquid xenon. The liquid purification system of the experiment allows the removal of electronegative impurities from liquid xenon at a much higher speed. A liquid purification test system has been built and operated at the Columbia University Astrophysics Lab. In this talk we will describe the XENONnT liquid purification system and present results from its test system.