The cryogenic, fluid handling, and purification systems of the nEXO experiment

Searched for over half a century with detectors of increasing size and sensitivity, neutrinoless double beta (0νββ) decay offers a means to explore whether neutrinos are massive Majorana fermions and thus a portal between matter and antimatter. nEXO is a five-tonne liquid xenon time projection chamber (LXe TPC) to search for 0νββ decay of xenon-136 with a half-life sensitivity >10^28 years. With respect to its predecessor experiment, EXO-200, nEXO features new scintillation light and ionization charge detectors, and in LXe front-end readout electronics. Novel solutions are also implemented in the cryogenic architecture and the xenon and refrigeration fluid systems. This talk will overview the nEXO design and provide details of the cryogenic and fluid handling and purification systems, highlighting the distinctive features of the LXe TPC technology within the global “tonne scale” program for 0νββ decay.