The DUNE experiment is a proposed next generation long-baseline neutrino oscillation experiment designed to solve mass hierarchy and CP-violation problems by measuring $\nu_{\mu}/\bar{\nu}_{\mu}$ to $\nu_{e}/\bar{\nu}_{e}$ oscillation in one single experiment.
It is therefore critical for DUNE to measure the electrons and positrons precisely.
The DUNE Near Detector, located at Fermilab, will provide a precise determination of the electron/positron identification, momentum, and energy, and the anti-electron neutrino content of the beam