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The Deep Underground Neutrino Experiment (DUNE) will be using a combination of liquid argon time projection chambers (LArTPCs) with the aid of other detectors to measure neutrino oscillation parameters with unprecedented precision. In order to accommodate the high event rate from the intense neutrino beam, a modularised LArTPC is designed for the DUNE near detector. Therefore, the length of the TPC drift can be significantly reduced resulting in benefits of easily achievable high voltage requirement and clean signal from decreased charge diffusion and enhanced electric-field uniformity. Resistive material is used as field-shell to shape the electric field and to maintain high uniformity. It occupies minimal amount of active volume in the detector and avoids the risk of single-point failure. This LArTPC is equipped with revolutionary pixelated readout which enables true 3D projection of particle passages. The pixelated readout eliminates projection ambiguity presented in wire-readout LArTPCs and is well suited for busy detector environment as in the DUNE near detector. Each TPC also deploys novel light detectors to measure module-contained scintillation light signal with high position resolution and light yield. The modularised LArTPC provides defined volume for charge-light matching which is particularly useful to identify neutrino events in the DUNE near detector with high event-rate. This talk will present the latest design of this LArTPC for the DUNE near detector and the results of the benchmark modules operated in the last year.
Chair: H. Sekiya