Design of the LArPix Shielding Plane

The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino oscillation experiment. A critical component of the DUNE Near Detector (ND) is a Liquid Argon Time Projection Chamber (LArTPC), called ND-LAr. A novel pixelated charge readout technology, LArPix, has been developed for LArTPCs. These pixelated anode designs have been implemented in the 2x2 Demonstrator, which consists of four 600kg liquid argon modules serving as a prototype for the DUNE ND-LAr.

During individual module tests with cosmic rays before the 2x2 neutrino beam run, evidence of LArPix retriggering by induced signal was identified. To reduce this effect, we utilize field response simulation to understand the behavior of the electronics and design a shielding plane. In this talk, we will present our shielding plane design and discuss its impact based on cosmic-ray tests.