Low Background kTon-Scale Liquid Argon Time Projection Chambers

Understand

We find that it is possible to increase sensitivity to low energy physics in a third or fourth DUNE-like module with careful controls over radiopurity and some modifications to a detector similar to the DUNE Far Detector design.

• In particular, sensitivity to supernova and solar neutrinos can be enhanced with improved MeV-scale reach.
• A neutrinoless double beta decay search with $^{136}$Xe loading appears feasible.
• Furthermore, sensitivity to Weakly-Interacting Massive Particle (WIMP) Dark Matter (DM) becomes competitive with the planned world program in such a detector, offering a unique seasonal variation detection that is characteristic for the nature of WIMPs.