Signal Processing in SBND with WireCell

The Short Baseline Near Detector (SBND), a 112 ton liquid argon time projection chamber (LArTPC), is the near detector of the Short Baseline Neutrino Program at Fermilab. In a LArTPC, ionization electrons from a charged particle track drift along electric field lines, inducing bipolar signals on the induction wire planes and a unipolar signal collected on the collection wire plane. In this talk, we present an overview of the WireCell signal processing (SP) chain. Signal processing, an essential step for preparing low-level data for further reconstruction, utilizes a 2D deconvolution (time and wire dimensions) for TPC field and electronics response removal, as well as software filters for noise removal and region-of-interest identification. We also present novel studies on SP optimization and SP performance validation, with dedicated case studies of both track-like (e.g. muons) and shower-like (e.g. electromagnetic cascades) objects. This talk will include validation of excess noise removal and other studies using SBND commissioning data.