Speaker
Description
The LEGEND-200 experiment is designed to search for a neutrino-less double beta decay. It is located in the Laboratori Nazionali del Gran Sasso in Italy. Currently, LEGEND uses about 150 kg of 76Ge enriched Germanium mono-crystals as both source and detector of double beta decays. These crystals are housed in a cryostat filled with liquid argon to provide an optimal operation environment as well as a first stage active muon veto. An enclosing water tank serves both as shielding against background radiation and as a second-stage active muon (Cherenkov) veto. The next stage of LEGEND will be LEGEND-1000, which will increase the detector mass to one ton. Additionally, the experiment will be housed in a completely new setup which provides the opportunity to optimize the design of the support installations and the experimental instrumentations as informed by LEGEND-200. This contribution will provide an overview of the current status of the water tank instrumentation development for the next stage of the experiment. It will discuss the geometry and predicted performance of the water Cherenkov veto and neutron tagger as well as proposed trigger predictions and DAQ scheme of these systems. This work is supported by the U.S. DOE, and the NSF, the LANL, ORNL and LBNL LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, and MPG; the Italian INFN; the Polish NCN and MNiSW; the Czech MEYS; the Slovak RDA; the Swiss SNF; the UK STFC; the Canadian NSERC and CFI; the LNGS and SURF facilities.